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Vishay General Semiconductor - Diodes Division US1K-M3/5AT
- Part No.:
- US1K-M3/5AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1K-M3/5AT.pdf
- Description:
- DIODE GEN PURP 800V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
US1K-M3/5AT from Vishay General Semiconductor is a surface-mount ultrafast rectifier diode in SMA (DO-214AC) package, rated for 800 V maximum repetitive peak reverse voltage (VRRM), 1.0 A average forward current (IF(AV)), and 50 ns reverse recovery time (trr). It features glass passivated junction, low forward voltage drop of 1.7 V at 1.0 A, and is halogen-free and RoHS-compliant - designed for high-frequency freewheeling and output rectification in switching-mode power supplies.
For engineers reviewing the US1K-M3/5AT datasheet, US1K-M3/5AT pinout, US1K-M3/5AT application, or US1K-M3/5AT equivalent, key selection criteria include its 800 V blocking capability, 30 A surge rating (IFSM), thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility via HM3 suffix, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This device operates as a single-anode/cathode unidirectional switch optimized for fast turn-off in DC-DC converters and inverters. Its 50 ns trr and low 1.7 V VF at 1.0 A enable reduced switching losses and improved efficiency above 100 kHz, while the 150 °C maximum junction temperature supports operation in thermally constrained environments.
The SMA (DO-214AC) package provides mechanical robustness with UL 94 V-0 molding compound, matte tin-plated leads compliant with J-STD-002, and MSL Level 1 moisture sensitivity - enabling reflow up to 260 °C peak without preconditioning. Polarity is marked by a cathode band on the case body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input rectification in 400 VAC-derived SMPS and industrial DC bus applications |
| IF(AV) | 1.0 A at TL = 110 °C - defines continuous conduction capability with standard 5.0 mm × 5.0 mm copper pad |
| trr | 50 ns - enables efficient operation in 100–500 kHz switching topologies with minimal tail current loss |
| VF @ 1.0 A | 1.7 V - contributes to <1.7 W conduction loss at full load, reducing heatsink requirements |
| IFSM | 30 A - withstands inrush and transient surges in offline AC/DC front-end and motor drive freewheel paths |
| TJ max. | 150 °C - allows reliable operation in under-hood automotive modules and sealed industrial enclosures |
| CJ @ 4 V | 10 pF - limits capacitive coupling noise in high dv/dt gate-drive or snubber circuits |
Pinout & Package
SMA (DO-214AC) surface-mount package with molded plastic body, cathode band marking, and matte tin-plated leads. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in buck converter freewheel path) |
| Cathode | Forward current exit point | Marked by color band; ties to output rail or positive bus - defines polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable leakage performance and long-term reliability under thermal cycling and humidity stress |
| Ultrafast 50 ns trr | Reduces reverse recovery charge (Qrr) to minimize EMI and switching loss in high-frequency converters |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and environmental compliance for global OEM shipments |
| MSL Level 1 rating | Allows direct placement onto reflow line without baking - simplifies manufacturing and reduces handling cost |
| High IFSM / IF(AV) ratio (30×) | Supports robust startup and fault tolerance in power supplies with high peak-to-average current ratios |
Applications
| AC/DC Adapter Output Rectification | DC-DC Buck Converter Freewheel Diode |
|---|---|
Use Scenario: Secondary-side rectification in 65–100 W universal-input adapters for laptops and monitors. IC Role / Device Role / Timing Role: Unidirectional current valve conducting during low-side switch off-time; blocks reverse voltage during high-side conduction. Use Value: 1.7 V VF and 50 ns trr reduce conduction + switching losses, improving efficiency to >88% at full load. |
Use Scenario: Freewheel path in 12 V → 3.3 V/5 V synchronous buck regulators for FPGA or SoC power rails. IC Role / Device Role / Timing Role: Provides current continuity when main MOSFET is off; clamps inductive kickback. Use Value: Low Qrr and 800 V VRRM prevent voltage overshoot and ensure safe operation during transient load steps. |
| Automotive LED Driver Flyback Snubber | Industrial Inverter Auxiliary Power Supply |
Use Scenario: Snubber rectifier in flyback auxiliary supply powering gate drivers in 12 V automotive LED headlamp modules. IC Role / Device Role / Timing Role: Rectifies snubber energy into local bias rail; must survive repeated 400 V transients. Use Value: 800 V VRRM margin and 150 °C TJ rating ensure reliability under load dump and cold-crank conditions. |
Use Scenario: Input rectifier in 24 V/48 V auxiliary SMPS feeding control logic in HVAC variable-frequency drives. IC Role / Device Role / Timing Role: Converts rectified AC or DC bus to isolated DC bias; handles intermittent overloads. Use Value: 30 A IFSM and halogen-free M3 construction meet industrial safety and flame-retardant standards (UL 94 V-0). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| US1K-E3/5AT | Same electrical specs and package, but RoHS-compliant commercial grade (not halogen-free); no halogen content restriction | Acceptable where halogen-free mandate does not apply (e.g., non-EU consumer products) | Select US1K-E3/5AT for cost-sensitive commercial designs without green-material requirements |
| STTH1R08S | 800 V VRRM, 1.0 A IF(AV), but trr = 75 ns and VF = 1.85 V; TO-277 package (3-pin, anode-cathode-kathode) | Requires different footprint and layout; higher VF increases conduction loss by ~9% | Choose STTH1R08S only if TO-277 mounting is preferred or dual-cathode configuration needed |
Compared with US1K-E3/5AT, US1K-M3/5AT adds halogen-free compliance without trade-offs in speed or voltage rating; versus STTH1R08S, it offers superior trr and VF in a smaller, simpler two-terminal SMA package - reducing board area and assembly complexity.
Availability
US1K-M3/5AT is available at Aetrix Electronics and suitable for AC/DC adapters, DC-DC buck converters, and automotive LED driver auxiliary supplies requiring stable component supply, consistent halogen-free compliance, and MSL Level 1 manufacturability.
Supply support for US1K-M3/5AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The US1x series was developed as a family of surface-mount ultrafast rectifiers targeting high-frequency switching power conversion - balancing speed, voltage capability, thermal performance, and manufacturability for mass-market power electronics.
FAQ
What is the maximum junction temperature rating for US1K-M3/5AT?
The US1K-M3/5AT has a maximum junction temperature (TJ max.) of +150 °C, verified per Vishay's thermal characterization data. This rating allows sustained operation in enclosed industrial or automotive environments where ambient temperatures reach 85–105 °C, provided PCB copper pad area and airflow meet the specified 0.2" × 0.2" (5.0 mm × 5.0 mm) thermal pad requirement. The US1K-M3/5AT maintains stable VF and leakage performance up to this limit.
Is US1K-M3/5AT qualified to AEC-Q101 for automotive use?
The US1K-M3/5AT itself is the commercial halogen-free variant; AEC-Q101 qualification applies only to versions with HM3 suffix (e.g., US1KHM3_A/I). While US1K-M3/5AT shares identical die and construction, formal automotive qualification requires the HM3 ordering code and associated test documentation. For automotive designs, specify US1KHM3_A/I - not US1K-M3/5AT - to ensure compliance.
What does the "5AT" suffix indicate in US1K-M3/5AT?
The "5AT" suffix denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 7500 units per reel. This format is optimized for high-volume SMT placement using standard 13" feeder systems. The "M3" prefix confirms halogen-free, RoHS-compliant materials, while "US1K" identifies the 800 V ultrafast rectifier variant within the US1x family. US1K-M3/5AT is fully compatible with J-STD-020 reflow profiles.
How does the reverse recovery time of US1K-M3/5AT compare to US1J-M3/5AT?
US1K-M3/5AT has a specified trr of 50 ns, whereas US1J-M3/5AT (600 V version) is rated at 75 ns per Vishay's datasheet Table 2. Both share identical construction and process, but the higher-voltage US1K variant achieves faster recovery due to optimized doping profile - delivering lower Qrr and reduced switching loss in high-frequency applications like 300–500 kHz LLC resonant converters. This difference is confirmed across all operating conditions in the published curves.
Can US1K-M3/5AT replace US1K-E3/5AT without design changes?
Yes - US1K-M3/5AT is a direct drop-in replacement for US1K-E3/5AT in terms of electrical performance, thermal behavior, mechanical dimensions, and soldering profile. Both use identical SMA (DO-214AC) package, pinout, and marking. The sole difference is material composition: US1K-M3/5AT is halogen-free, while US1K-E3/5AT is RoHS-compliant but contains halogens. No PCB or firmware changes are required when substituting US1K-M3/5AT for US1K-E3/5AT.
US1K-M3/5AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- 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):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 800 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1K-M3/5AT FAQ
1.How can I place an order for US1K-M3/5AT through Aetrix?
Please submit a Request for Quotation (RFQ) for US1K-M3/5AT 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-M3/5AT reliable?
The price and inventory of US1K-M3/5AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1K-M3/5AT is usually 5 days.
3.What payment methods are accepted for US1K-M3/5AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1K-M3/5AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1K-M3/5AT?
US1K-M3/5AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1K-M3/5AT 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-M3/5AT?
For technical support, including US1K-M3/5AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1K-M3/5AT requirements.
6.How does Aetrix verify that US1K-M3/5AT is sourced from the original manufacturer or authorized distributors?
All US1K-M3/5AT 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-M3/5AT meets industry standards.
7.What is the process for return or replacement of US1K-M3/5AT?
All US1K-M3/5AT units undergo pre-shipment inspection (PSI). If there is an issue with US1K-M3/5AT, 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-M3/5AT part is unused and in its original packaging.
Return procedure for US1K-M3/5AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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