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Taiwan Semiconductor Corporation US1K
- Part No.:
- US1K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1K.pdf
- Description:
- DIODE GEN PURP 800V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:13,623
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Product details
Overview
US1K from Taiwan Semiconductor is an ultrafast surface-mount silicon rectifier diode rated for 800 V repetitive peak reverse voltage, 1 A average forward current, and 30 A non-repetitive surge current, with 1.7 V typical forward voltage at 1 A and 75 ns reverse recovery time - used as a freewheeling or snubber diode in high-frequency switching power supplies.
For engineers reviewing the US1K datasheet, US1K pinout, US1K application, or US1K equivalent, key selection factors include its DO-214AC (SMA) package compatibility, 800 V VRRM rating, 75 ns trr performance, thermal resistance (RθJA = 75 °C/W), and suitability for DC-DC converters and lighting inverters requiring fast recovery and low conduction loss.
Technical Context
The US1K is a single-die, planar passivated silicon PN junction rectifier optimized for high-efficiency switching-mode power conversion. Its ultrafast recovery (75 ns) and low Qrr support reduced switching losses in high-frequency topologies like flyback and active clamp forward converters.
Designed for surface-mount assembly on standard reflow profiles, it features matte tin-plated leads compliant with J-STD-002, moisture sensitivity level 1 per J-STD-020, and UL 94V-0 molding compound - enabling reliable automated placement and long-term reliability in industrial-grade power modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input rectification up to 560 V RMS in offline SMPS designs |
| IF(AV) | 1 A - continuous DC output current capability at TA ≤ 75°C with derating above |
| trr | 75 ns - enables operation up to ~2 MHz switching frequency with minimal tail current loss |
| VF @ 1 A | 1.7 V max - contributes <1.7 W conduction loss at full load in 1 A applications |
| RθJA | 75 °C/W - requires ≥ 100 mm² copper pad for safe operation at full current in still air |
| IR @ 800 V | 5 µA max @ 25°C - ensures low leakage in high-impedance hold-up or sensing circuits |
Pinout & Package
Package: DO-214AC (SMA), molded plastic case with cathode band marking; dimensions per JEDEC DO-214AC outline; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to lower-potential node (e.g., switch node in flyback secondary or ground return path) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to higher-potential rail (e.g., output capacitor positive or VCC rail); polarity critical for correct rectification |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable long-term reverse leakage performance and humidity resistance without hermetic sealing |
| Ultrafast recovery (75 ns) | Reduces switching losses and EMI generation compared to standard recovery rectifiers in >100 kHz designs |
| DO-214AC (SMA) package | Standardized footprint compatible with automated pick-and-place and reflow soldering; industry-wide PCB land pattern reuse |
| Moisture sensitivity level 1 | Eliminates bake requirement before SMT assembly, reducing manufacturing cost and process complexity |
Applications
| DC–DC Converter | Switching Inverter |
|---|---|
Use Scenario: Secondary-side synchronous rectification in isolated 12 V/1 A flyback converter for industrial IoT gateways. IC Role / Device Role / Timing Role: Freewheeling diode providing unidirectional current path during MOSFET off-time. Use Value: 75 ns trr minimizes reverse recovery charge loss, improving efficiency by ~1.2% over standard 1N4007 at 250 kHz. | Use Scenario: Output rectification in LED driver inverter stage driving 48 V constant-current strings. IC Role / Device Role / Timing Role: High-voltage output rectifier handling 800 V reverse stress during PWM dead-time transitions. Use Value: 800 V VRRM rating provides 20% margin over 600 V bus peaks, ensuring robustness against line transients. |
| Snubber Network | Lighting Ballast |
Use Scenario: RCD snubber clamp diode across primary-side MOSFET in 65 W AC-DC adapter. IC Role / Device Role / Timing Role: Fast recovery path for transformer leakage energy dissipation during turn-off. Use Value: Low Qrr and 1.7 V VF reduce snubber power dissipation by 35% vs. slower 1N4937 equivalents. | Use Scenario: Input bridge rectifier in compact CFL electronic ballast operating from 230 VAC mains. IC Role / Device Role / Timing Role: Single-phase rectification with high surge tolerance for cold-start inrush currents. Use Value: 30 A IFSM withstands 10× cold-start surges without degradation, extending product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R08 | 800 V VRRM, 1 A IF, 75 ns trr, same DO-214AC package but higher VF (1.85 V typ) | Slightly higher conduction loss in low-VF-critical designs; identical thermal and layout fit | Preferred where ST's qualification for automotive AEC-Q101 is required |
| ES1J | 600 V VRRM (not 800 V), same 1 A/75 ns spec, DO-214AC package, VF = 1.7 V | Insufficient voltage margin for 400 VDC bus applications; limited to ≤ 420 V RMS inputs | Select only when system peak reverse stress remains below 600 V |
Compared with STTH1R08 and ES1J, the US1K delivers identical speed and package fit with lowest VF among 800 V-class alternatives, making it optimal for thermally constrained 1 A power rails where conduction loss dominates efficiency budget.
Availability
US1K is available at Aetrix Electronics and suitable for DC–DC converters, LED lighting inverters, and snubber networks requiring stable component supply with consistent parametric performance across production lots.
Supply support for US1K 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, serving industrial, computing, and consumer markets since 1979.
The US1K belongs to TSC's US1x ultrafast rectifier family, engineered specifically for high-frequency switching power supplies demanding low VF, fast trr, and robust surge capability in compact surface-mount packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) of the US1K?
The US1K has a maximum repetitive peak reverse voltage (VRRM) of 800 V, verified per Taiwan Semiconductor's N2102 datasheet revision. This rating allows the US1K to safely block transient voltages up to 800 V in applications such as offline SMPS input stages or high-voltage DC link rectification. The US1K must not be operated beyond this limit to ensure long-term reliability and avoid avalanche breakdown.
Does the US1K have a specified reverse recovery time (trr), and what is its value?
Yes, the US1K has a specified reverse recovery time (trr) of 75 ns maximum under test conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This ultrafast recovery characteristic is confirmed in the Electrical Specifications table of the official US1x datasheet (Version N2102). The 75 ns trr makes the US1K suitable for switching frequencies up to ~2 MHz in well-designed layouts.
What package type does the US1K use, and is it RoHS compliant?
The US1K uses the DO-214AC (SMA) surface-mount package, with matte tin-plated leads and UL 94V-0 compliant molding compound. It is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the Features section of the Taiwan Semiconductor US1x datasheet. The device also meets JESD 201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 requirements.
What is the forward voltage (VF) of the US1K at 1 A forward current?
The US1K has a maximum forward voltage (VF) of 1.7 V at IF = 1 A and TJ = 25°C, per the Electrical Specifications table in the official datasheet. This value is measured under pulsed conditions (PW = 0.3 ms) to minimize self-heating. At elevated junction temperatures or higher currents, VF may increase slightly due to positive temperature coefficient behavior typical of silicon PN junctions.
Can the US1K replace the US1J or US1M in a design?
The US1K is not a direct replacement for US1J (600 V) or US1M (1000 V) without verifying voltage margin requirements. While all share identical package, current rating, and trr, their VRRM ratings differ: US1J = 600 V, US1K = 800 V, US1M = 1000 V. Substituting US1K for US1M risks insufficient reverse voltage headroom; substituting for US1J may be acceptable if system peak reverse stress exceeds 600 V but stays below 800 V.
US1K 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1K FAQ
1.How can I place an order for US1K through Aetrix?
Please submit a Request for Quotation (RFQ) for US1K 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 US1K reliable?
The price and inventory of US1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1K is usually 5 days.
3.What payment methods are accepted for US1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1K?
US1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1K 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 US1K?
For technical support, including US1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1K requirements.
6.How does Aetrix verify that US1K is sourced from the original manufacturer or authorized distributors?
All US1K 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 US1K meets industry standards.
7.What is the process for return or replacement of US1K?
All US1K units undergo pre-shipment inspection (PSI). If there is an issue with US1K, 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 US1K part is unused and in its original packaging.
Return procedure for US1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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