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ROHM’s New SiC Schottky Barrier Diodes for High Voltage xEV Systems: Featuring a Unique Package Design for Improved Insulation Resistance

　　ROHM has developed surface mount SiC Schottky barrier diodes (SBDs) that improve insulation resistance by increasing the creepage distance between terminals. The initial lineup includes eight models - SCS2xxxNHR - for automotive applications such as onboard chargers (OBCs), with plans to deploy eight models - SCS2xxxN - for industrial equipment such as FA devices and PV inverters in December 2024.　　The rapidly expanding xEV market is driving the demand for power semiconductors, among them SiC SBDs, that provide low heat generation along with high-speed switching and high-voltage capabilities in applications such as onboard chargers. Additionally, manufacturers increasingly rely on compact surface mount devices (SMDs) compatible with automated assembly equipment to boost manufacturing efficiency. Compact SMDs tend to typically feature smaller creepage distances, fact that makes high-voltage tracking prevention a critical design challenge.　　As leading SiC supplier, ROHM has been working to develop high-performance SiC SBDs that offer breakdown voltages suitable for high-voltage applications with ease of mounting. Adopting an optimized package shape, it achieves a minimum creepage distance of 5.1mm, improving insulation performance when contrasted with standard products.　　The new products utilize an original design that removes the center pin previously located at the bottom of the package, extending the creepage distance to a minimum of 5.1mm, approx. 1.3 times greater than standard products. This minimizes the possibility of tracking (creepage discharge) between terminals, eliminating the need for insulation treatment through resin potting when surface mounting the device on circuit boards in high voltage applications. Additionally, the devices can be mounted on the same land pattern as standard and conventional TO-263 package products, allowing an easy replacement on existing circuit boards.　　Two voltage ratings are offered, 650V and 1200V, supporting 400V systems commonly used in xEVs as well as higher voltage systems expected to gain wider adoption in the future. The automotive-grade SCS2xxxNHR are AEC-Q101 qualified, ensuring they meet the high reliability standards this application sector demands.　　Going forward, ROHM will continue to develop high-voltage SBDs using SiC, contributing to low energy consumption and high efficiency requirements in automotive and industrial equipment by providing optimal power devices that meet market needs.　　Application Examples◇ Automotive applications: Onboard chargers (OBCs), DC-DC converters, etc.　　◇ Industrial Equipment: AC servo motors for industrial robots, PV inverters, power conditioners, uninterruptible power supplies (UPS), and more　　Online Sales InformationAvailability: The SCS2xxxxNHR for automotive applications are available now.　　The SCS2xxxN for industrial equipment are scheduled in December 2024.　　Pricing: $10.50/unit (samples, excluding tax)　　Online Distributors: DigiKey™, Mouser™ and Farnell™　　The products will be offered at other online distributors as they become available.　　EcoSiC™ BrandEcoSiC™ is a brand of devices that leverage silicon carbide, which is attracting attention in the power device field for performance that surpasses silicon. ROHM independently develops technologies essential for the advancement of SiC, from wafer fabrication and production processes to packaging, and quality control methods. At the same time, we have established an integrated production system throughout the manufacturing process, solidifying our position as a leading SiC supplier.　　TerminologyCreepage Distance　　The shortest distance between two conductive elements (terminals) along the surface of the device package. In semiconductor design, insulation measures with such creepage and clearance distances must be taken to prevent electric shocks, leakage currents, and short-circuits in semiconductor products.　　Tracking (Creepage Discharge)　　A phenomenon where discharge occurs along the surface of the package (insulator) when high voltage is applied to the conductive terminals. This can create an unintended conductive path between patterns, potentially leading to dielectric breakdown of the device. Package miniaturization increases the risk of tracking by reducing creepage distance.　　Resin Potting　　The process of encapsulating the device body and the electrode connections between the device and circuit with resin, such as epoxy, to provide electrical insulation. This provides durability and weather resistance by protecting against water, dust, and other environmental conditions.　　AEC-Q101 Automotive Reliability Standard　　AEC stands for Automotive Electronics Council, a reliability standard for automotive electronic components established by major automotive manufacturers and US electronic component makers. Q101 is a standard that specifically applies to discrete semiconductor products (i.e. transistors, diodes).

Key word：

ROHM

Release time：2024-11-20 14:00 reading：423 Continue reading>>

New Automotive-Grade DFE2MCPH_JL Series Power Inductors Have Improved DC <span style='color:red'>resistance</span> and Current Rating

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New Automotive-Grade DFE2MCPH_JL Series Power Inductors Have Improved DC resistance and Current Rating

　　Murata, a leading manufacturer of passive components, has expanded their line-up with the release of the DFE2MCPH_JL series of automotive-grade power inductors with values 0.33µH and 0.47µH, specifically designed for automotive powertrain/safety equipment. Compared with existing products in the Murata DFE2MCAH_J0 series, the 0.33µH part, for example achieves the highest standards in the industry with a reduction of 38% in DC resistance to 18 mOhm along with a 31% increase in rated current to 5.1 A for the same temperature rise. Rated current for a specified inductance drop is also 64% higher at 6.9 A. In addition, this product realized 40V of withstand voltage, and this is all in 0806-inch size with an operating temperature range of -40°C to +155°C with current derating.　　The metal alloy inductors leverage Murata’s advances in material and manufacturing technology to achieve a combination of high quality and performance. This makes the parts ideal for demanding automotive applications such as ADAS and IVI systems – a market that is rapidly expanding.　　The high DC current rating and low power dissipation of the DFE2MCPH_JL series, complemented by a high impulse voltage rating, make them particularly suitable for low-loss filtering and energy storage in power converter applications. At the same time, the miniature package saves space and material usage.　　Murata will continue to expand inductance value from 0.1 µH to 4.7µH in the future to meet market needs and to expand the breadth of automotive applications.　　Further applications for these high current, high-grade inductors are in automotive infotainment/comfort systems and medical equipment GHTF Classes A, B and Class C (not implant).

Key word：

murata

Release time：2024-01-31 16:39 reading：1630 Continue reading>>

Trade news

ROHM’s New 5-Model Lineup of Low ON Resistance 100V Dual MOSFETs

　　ROHM has developed dual MOSFETs that integrate two 100V chips in a single package - ideal for fan motor drive applied in communication base stations and industrial equipment. New five-models have been added as part of the HP8KEx/HT8KEx (Nch+Nch) and HP8MEx (Nch+Pch) series.　　Recent years have seen a transition to higher voltages from conventional 12V/24V to 48V systems in communication base stations and industrial equipment, - intending to achieve higher efficiency by reducing current values. In these situations, switching MOSFETs are required a withstand voltage of 100V to account for voltage fluctuations, as 48V power supplies are also used in the fan motors for cooling these applications. However, increasing the breakdown voltage raises ON resistance (RDS(on)) (which is in a trade-off relationship), leading to decreased efficiency, making it difficult to achieve both lower RDS(on) and higher breakdown voltage. Moreover, unlike multiple individual drive MOSFETs normally applied in fan motors -　dual MOSFETs that integrate two chips in one package are increasingly being adopted to save space.　　In response, ROHM developed two new series - the HP8KEx/HT8KEx (Nch+Nch) and the HP8MEx (Nch+Pch) - that combine Nch and Pch MOSFET chips using the latest processes. Both series achieve the industry’s lowest RDS(on) by adopting new backside heat dissipation packages with excellent heat dissipation characteristics. As a result, RDS(on) is reduced by up to 56% compared with standard dual MOSFETs (19.6mΩ for the HSOP8 and 57.0mΩ for the HSMT8 Nch+Nch), contributing to significantly lower set power consumption. At the same time, combining two chips in a single package provides greater space savings by reducing area considerably. For example, replacing two single-chip TO-252 MOSFETs with one HSOP8 decreases footprint by 77%.　　Next, ROHM will continue to expand its dual MOSFET lineup to withstand voltages ideal for industrial equipment while also developing low-noise variants. This is expected to contribute to solving social issues such as environmental protection by saving space and reducing power consumption in various applications.　　Application Examples - Fan motors for communication base stations　　- Fan motors for factory automation, and other industrial equipment　　- Fan motors for data center servers, etc.　　Combination with a pre-driver IC to achieve the optimal motor drive solutionCombining these products with ROHM’s market-proven pre-driver ICs for single-/3-phase brushless motors make it possible to consider even smaller motors featuring lower consumption and quieter drive. By providing total support for peripheral circuit design that marries the dual-MOSFET series with pre-driver ICs, ROHM can offer the best motor drive solutions for customer needs.　　Solution examples with 100V Dual MOSFETs　　- HT8KE5 (Nch+Nch Dual MOSFET) + BM64070MUV (3-Phase Brushless Motor Pre-Driver IC)　　- HT8KE6 (Nch+Nch Dual MOSFET) + BM64300MUV (3-Phase Brushless Motor Pre-Driver IC) and more

Key word：

ROHM

Release time：2023-10-19 16:07 reading：1977 Continue reading>>

How to distinguish the role of color ring inductor in circuit from color ring <span style='color:red'>resistance</span>

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How to distinguish the role of color ring inductor in circuit from color ring resistance

　　Color code inductance is also called color ring inductance. When the color ring inductor uses the current through the circuit, only fixed magnetic force lines are displayed around the inductor. In order to improve your understanding of color ring inductor, the following is related content of color ring inductor sorted out by AMEYA360 electronic components purchasing network, hoping to provide you with reference and help. However, when the color ring inductor passes an alternating current through the coil, the magnetic force line around the color ring inductor changes with time.　　First, the role of color ring inductance in the circuit　　1, screen signals, color code inductance can play a role of frequency selection, when the color code inductance and electrolytic capacitor in parallel can be composed of tuning circuit. The inductance and capacitive reactance of the color code inductor in the circuit are opposite, so that the natural oscillation frequency f0 in the circuit is equal to the frequency f of the non-AC signal, so as to play a role of signal screening.　　2, inhibit electromagnetic wave interference, that is, inhibit EMC interference. Color code inductor and capacitor are combined to form LC filter circuit, in which EMC interference can be suppressed.　　3, stable current, color ring inductance plays a role in the circuit to stabilize the current. When the current increases, the color ring inductor generates induced electromotive force to prevent the current from increasing. When the current decreases, the color ring inductor will release the energy previously stored, thus reducing the current reduction.

Key word：

Color ring resistance,resistance,inductance

Release time：2023-03-10 11:41 reading：1698 Continue reading>>

Google walkouts: The new tech <span style='color:red'>resistance</span> looked a lot like union organizing

Trade news

Google walkouts: The new tech resistance looked a lot like union organizing

Jillian D'Onfro | CNBCAn atypical spirit of tech worker solidarity was on display Thursday morning, as 20,000 Google employees poured from offices in 50 cities around the world as part of a massive walk-out to protest the way the company handles sexual harassment.The widespread demonstrations, spurred by a revealing New York Times report that detailed how Google has shielded executives accused of sexual misconduct, were the largest-scale representation yet of a new type of labor organizing catching on in the tech industry.Brishen Rogers, an associate professor at Temple University who specializes in the relationship between labor and technological development, says that the scale of yesterday's demonstrations amazed him."I've never seen anything like this in the tech sector," says Rogers. "The numbers and level of coordination involved in the Google strike was unprecedented."One Google employee, who asked for anonymity since they weren't authorized to speak about the company, says that Thursday's protests felt like lightning striking in how fast they came together.A family or a job?Collective bargaining hasn't traditionally had a place in Silicon Valley. Unions are nearly non-existent for white-collar tech workers, who typically enjoy large salaries, cushy perks and plenty of career mobility thanks to their high-demand skills.Wendy Liu, the economics editor of UK-based publication "New Socialist" and a former Google employee, says that the protests overall were "incredibly inspiring" as the idea of employee dissent spreads in Silicon Valley."For tech workers to even think of themselves as workers — with the implication that their class interests may run counter to that of their bosses — is an exciting development," she says."Tech companies often try to get employees to see themselves as 'team members,' and part of a 'family' who should feel love and even gratitude for their company."She, too, felt that way when she was at Google, she says, before realizing how unhealthy that dynamic was for workers.On Thursday, Google employees borrowed tactics from historical labor organizing. In their statement of demands, the protest's leading organizers linked themselves to movements like the teachers strike in West Virginia and the "Fight for $15" demonstrations by fast-food workers.Indeed, the San Francisco demonstration was even held in Harry Bridges Plaza — Bridges was an influential union leader in the early 20th century — and speakers spoke of his and other examples of historical labor organizing. Demonstrators in San Francisco also talked about the simultaneous union strikes by Marriott employees.Blue-collar workers at major tech companies, like Facebook's cafeteria workers and Bay Area security guards, have started unionizing over the past several years. In another sign of the burgeoning "new tech resistance," organizers of Google's protests were deliberate about including those contract workers in their demands.Tech firms are increasingly hiring contractors, vendors, and temps (TVCs), which can boost profits and speed up hiring. However, those workers typically make less, shoulder higher benefits costs, and lack the job security of direct employees. Earlier this year, Bloomberg reported the astounding stat that Alphabet employed more TVCs than direct employees. No small feat, as Alphabet had 85,050 direct staffers at the time.Jillian D'Onfro | CNBCGoogle employees hold signs at the protest in Mountain View, California. Many demonstrators at Google's Mountain View headquarters leaned into the idea that the only way to achieve their demands — which include the end of private arbitration, a transparency report about sexual harassment, more disclosures about compensation and an employee representative on the company's board — were only possible if all employees at every level of the company were active and included."I'm here because every one of our voices matter and if we are not standing together the necessary changes won't happen," one employee protester told CNBC.Many of the employees who spoke on stage or to CNBC from the crowd declined to give their full names. The Tech Workers Coalitionis organizing a retaliation hotline, which employees will be able to call if they face retribution for their participation in the walk-out.Michelle Castillo | CNBCGoogle employees walked out on November 1, 2018 to protest what organizers describe as "a workplace culture that's not working for everyone."A woman named Sheree who spoke on stage elicited particularly loud cheers when she challenged attendees to think about how their advocacy would extend beyond a one day event."Showing up today is a really good start," she said. "But to be a true ally you have to sacrifice something. What will you sacrifice?""This doesn't end today"Over the last year, there's been an increase in tech industry organizing, as workers have banded together to try to compel their employers to drop controversial projects or take a stand against government policies.At Alphabet's shareholders' meeting earlier this year, a group of employees bucked leadership by presenting a proposal that called for Alphabet's executive compensation to be tied to diversity metrics. Employees also rebuked the company's lack of transparency around leaked plans fora censored search app in China and a controversial Pentagon contract. In June, following intense employee backlash, Google's cloud unit said that it would not renew contract next year."The Google walkout amplifies the wave of tech worker organizing that we see in #TechWontBuildIt and #NoTechforICE," says Sasha Constanza-Chock, associate professor of civic media at MIT who co-authored a recent open letter calling on Microsoft to drop its ICE contract. "It also links tech worker organizing with #MeToo, just as #NoTechforICE links tech worker organizing with immigrant rights."Activists see Google's blow-out protests as being a bellwether for more organizing to come.Employees from other tech companies in San Francisco joined in the Google walk-out on Thursday, and the Tech Workers Coalition says that in the last year its has attracted more interest, and seen an increase in both email subscribers and actual events."We are organizing to build worker power through rank and file self-organization and education," a spokesperson says. "It's clear the executives won't do this for us, so we're taking matters into our own hands."While changing Google's culture will be a long haul, Google organizers' demands were specific and actionable. Google CEO Sundar Pichai, who spoke on stage at a conference the day of the protests, has not committed to any changes, but told employees in a memo that his team was taking in feedback to "turn ideas into action." Even though Google workers have no legal rights to collectively bargain with management without a union, the energy at the demonstrations indicated that employees will not give up quickly.Celie O'Neil-Hart, one of the leaders of the protest who works at YouTube, rallied employees at the end of the protest to keep the momentum going."This doesn't end today," she bellowed over a loudspeaker in Mountain View. "Let's keep this effort going. Time is up in tech. Time is up at Google."

Key word：

Google

Release time：2018-11-05 00:00 reading：1163 Continue reading>>

model	brand	Quote
BD71847AMWV-E2	ROHM Semiconductor
TL431ACLPR	Texas Instruments
MC33074DR2G	onsemi
RB751G-40T2R	ROHM Semiconductor
CDZVT2R20B	ROHM Semiconductor

model	brand	To snap up
TPS63050YFFR	Texas Instruments
STM32F429IGT6	STMicroelectronics
IPZ40N04S5L4R8ATMA1	Infineon Technologies
ESR03EZPJ151	ROHM Semiconductor
BP3621	ROHM Semiconductor
BU33JA2MNVX-CTL	ROHM Semiconductor

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