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Taiwan Semiconductor Corporation US1KH
- Part No.:
- US1KH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1KH.pdf
- Description:
- DIODE GEN PURP 800V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
US1KH from Taiwan Semiconductor is a 1A, 800V ultrafast surface-mount rectifier diode in DO-214AC (SMA) package, featuring 1.7V max forward voltage at 1A, 75ns reverse recovery time, and AEC-Q101 qualification for automotive-grade reliability. It serves as a freewheeling or snubber diode in high-frequency DC/DC converters.
For engineers reviewing the US1KH datasheet, US1KH pinout, US1KH application, or US1KH equivalent, key selection criteria include its 800V repetitive peak reverse voltage, 30A non-repetitive surge rating, glass-passivated junction, moisture sensitivity level 1, and RoHS/halogen-free compliance per IEC 61249-2-21.
Technical Context
The US1KH operates as a single-die, unidirectional silicon rectifier with a cathode-banded polarity marking. Its ultrafast recovery (75ns typ.) enables efficient switching in 50–500 kHz power topologies, while the glass-passivated junction ensures stable leakage performance up to 125°C (150 µA IR).
Thermally, it delivers RθJL = 27°C/W and RθJA = 75°C/W, supporting 1A continuous conduction in standard PCB layouts without forced airflow. The DO-214AC package meets UL 94V-0 and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input stages in 400–600 VDC bus systems with 20% safety margin |
| IF | 1 A continuous - rated for steady-state output rectification in sub-15W SMPS |
| IFSM | 30 A - withstands inrush and transient surges in automotive cold-crank conditions |
| VF (max) | 1.7 V @ 1A, 25°C - limits conduction loss to ≤1.7 W at full load, reducing thermal stress |
| trr (max) | 75 ns - minimizes switching loss and EMI in high-frequency flyback and boost converters |
| TJ (max) | 150 °C - enables operation in under-hood automotive environments without derating |
| CJ | 10 pF @ 1 MHz, 4 V - low capacitance preserves high-speed switching integrity and reduces capacitive coupling |
Pinout & Package
DO-214AC (SMA) surface-mount package with matte tin-plated leads, cathode indicated by a band on the body. Weight: 0.060 g. Complies with J-STD-002 solderability and JESD201 Class 2 whisker requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry point during forward conduction | Connected to lower-potential node (e.g., switch node in buck converter or transformer secondary center-tap) |
| Cathode (banded end) | Current exit point during forward conduction | Connected to higher-potential rail (e.g., output capacitor positive or VOUT bus) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and UHST |
| Glass-passivated junction | Prevents moisture-induced degradation and ensures long-term IR stability at 125°C |
| Ultrafast recovery (75 ns) | Reduces reverse recovery charge (Qrr) to <15 nC, lowering switching losses in 200+ kHz designs |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly lines |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive LED Headlamp Driver | Industrial DC/DC Isolated Converter |
|---|---|
Use Scenario: High-side synchronous rectification in 12–48 V input LED driver with PWM dimming and thermal foldback. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductor current during high-side FET off-time. Use Value: 75 ns trr prevents cross-conduction loss and maintains >92% efficiency at 300 kHz switching frequency. | Use Scenario: Output rectification in 24 V input, 5 V/2 A isolated flyback supplying PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated DC output with minimal voltage drop. Use Value: 1.7 V VF limits conduction loss to 1.7 W, enabling natural convection cooling on 1 oz copper PCB. |
| Snubber Network in Motor Drive Inverter | USB-C PD Adapter Secondary Side |
Use Scenario: RC snubber across IGBT collector-emitter in 24 V BLDC motor control with regenerative braking. IC Role / Device Role / Timing Role: Clamp transient voltage spikes during IGBT turn-off using fast reverse recovery. Use Value: 800 V VRRM and 30 A IFSM absorb 200 V/10 A transients without avalanche failure. | Use Scenario: Secondary-side synchronous rectification replacement in 65 W USB-C PD adapter operating at 100 kHz. IC Role / Device Role / Timing Role: Passive rectifier replacing active MOSFET in cost-sensitive, space-constrained designs. Use Value: DO-214AC footprint allows direct layout reuse; 10 pF CJ minimizes high-frequency noise coupling into feedback loop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R08 | Same 1A/800V rating; 75 ns trr, but VF = 1.85 V (max) - 8.8% higher conduction loss | Qualified to AEC-Q101 but lacks halogen-free certification per IEC 61249-2-21 | Preferred where legacy STMicro design reuse is prioritized over environmental compliance |
| ON Semi MUR108 | 800 V VRRM, 1 A IF, but trr = 100 ns (max) - 33% slower recovery than US1KH | Not AEC-Q101 qualified; intended for industrial/commercial only | Acceptable for non-automotive 50–100 kHz converters where EMI margin exists |
Compared with STTH1R08 and MUR108, the US1KH delivers lower forward voltage and full halogen-free compliance while matching AEC-Q101 qualification - making it optimal for next-generation automotive lighting and compact USB-C PD adapters requiring both efficiency and regulatory alignment.
Availability
US1KH is available at Aetrix Electronics and suitable for automotive LED drivers, industrial DC/DC converters, snubber networks, and USB-C PD adapter secondary-side rectification requiring stable component supply and AEC-Q101 assurance.
Supply support for US1KH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability rectifiers, TVS diodes, and MOSFETs.
The US1KH belongs to TSC's US1xH ultrafast rectifier family, engineered specifically for high-efficiency, high-reliability automotive and industrial power conversion where low VF, fast trr, and AEC-Q101 validation are mandatory.
FAQ
What is the maximum junction temperature rating for US1KH?
The US1KH has a maximum junction temperature (TJ) of +150°C, validated across its full operating range from –55°C to +150°C. This rating enables reliable operation in under-hood automotive environments and enclosed industrial enclosures without active cooling. Derating begins above 75°C ambient per the forward current derating curve in the US1KH datasheet.
Is US1KH suitable for use in automotive lighting applications?
Yes, US1KH is AEC-Q101 qualified and explicitly listed for car lighting applications in its official documentation. Its 800 V VRRM, 75 ns trr, and glass-passivated junction ensure robust performance in LED headlamp drivers subject to load dump and cold-crank transients. The US1KH also meets J-STD-020 moisture sensitivity level 1 for standard SMT processing.
What does the 'K' in US1KH indicate?
The 'K' in US1KH denotes the 800 V repetitive peak reverse voltage (VRRM) rating within the US1xH family. Per the ordering table, US1KH corresponds to VRRM = 800 V, VR(RMS) = 560 V, and shares the same DO-214AC (SMA) package and electrical characteristics (e.g., 1.7 V VF, 75 ns trr) as other members of the series differentiated only by voltage grade.
Does US1KH have halogen-free and RoHS compliance documentation?
Yes, US1KH is certified halogen-free per IEC 61249-2-21 and RoHS compliant per EU Directive 2011/65/EU. These declarations are confirmed in the official Taiwan Semiconductor product specification document Version A2102, which states compliance explicitly in the FEATURES section and mechanical data pages.
What is the reverse leakage current of US1KH at elevated temperature?
At 125°C junction temperature and rated reverse voltage, the US1KH exhibits a maximum reverse leakage current (IR) of 150 µA, as specified in the ELECTRICAL SPECIFICATIONS table. At 25°C, IR is limited to 5 µA. This low, thermally stable leakage supports reliable snubber and hold-up capacitor isolation in high-temperature automotive and industrial deployments.
US1KH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.7 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 10pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1KH FAQ
1.How can I place an order for US1KH through Aetrix?
Please submit a Request for Quotation (RFQ) for US1KH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for US1KH reliable?
The price and inventory of US1KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1KH is usually 5 days.
3.What payment methods are accepted for US1KH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1KH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1KH?
US1KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1KH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for US1KH?
For technical support, including US1KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1KH requirements.
6.How does Aetrix verify that US1KH is sourced from the original manufacturer or authorized distributors?
All US1KH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that US1KH meets industry standards.
7.What is the process for return or replacement of US1KH?
All US1KH units undergo pre-shipment inspection (PSI). If there is an issue with US1KH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The US1KH part is unused and in its original packaging.
Return procedure for US1KH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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