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Diotec Semiconductor US1M
- Part No.:
- US1M
- Manufacturer:
- Diotec Semiconductor
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1M.pdf
- Description:
- DIODE GEN PURP 1000V 1A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:19,553
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Product details
Overview
US1M from Diodes Incorporated is a 1.0A surface-mount ultra-fast rectifier diode with 1000V peak repetitive reverse voltage, 50ns reverse recovery time, and SMA package; it serves as the primary output rectifier in offline AC-DC power supplies and DC-DC flyback converters operating at 60–100kHz.
For engineers reviewing the US1M datasheet, US1M pinout, US1M application, or US1M equivalent, key selection criteria include its 1000V VRRM, 1.7V VF @ 1.0A, 30A IFSM surge rating, thermal resistance of 30°C/W, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
The US1M operates as a unidirectional silicon PN junction rectifier optimized for high-frequency switching power conversion. Its ultra-fast recovery (trr = 50ns) minimizes switching losses during turn-off, while the glass-passivated die ensures stable leakage performance up to +100°C.
Designed for single-phase half-wave rectification under resistive/inductive loads, it requires 20% current derating for capacitive loads. The cathode-band polarity marking and SMA package support reliable orientation and thermal dissipation in compact board layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - Withstands peak reverse voltage in 1000V-class AC line applications without breakdown. |
| IO | 1.0 A @ TT = +75°C - Continuous average forward current capability under standard thermal conditions. |
| trr | 50 ns - Enables efficient operation in 60–100 kHz SMPS designs by limiting reverse recovery charge loss. |
| VF | 1.7 V @ IF = 1.0A - Forward drop directly impacts conduction loss and thermal rise in rectifier stage. |
| IFSM | 30 A (8.3ms half-sine) - Supports cold-start surge and transient overload without failure. |
| RθJT | 30 °C/W - Junction-to-terminal thermal resistance determines heatsinking requirements for 1.0A continuous load. |
Pinout & Package
SMA (DO-214AC) surface-mount package: molded plastic case, UL 94V-0 rated, cathode band polarity marking, matte tin lead finish, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to transformer secondary or switch node; must handle full 1.0A average current and 30A surge. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to output filter capacitor; sustains 1000V reverse bias during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Eliminates need for hermetic sealing while maintaining stable IR and trr across temperature and humidity. |
| Ultra-fast 50ns recovery | Reduces switching loss and EMI generation compared to standard fast recovery diodes (e.g., 150–300ns). |
| 30A non-repetitive surge rating | Withstands inrush currents in AC-DC adapters and industrial power supplies without degradation. |
| Lead-free, halogen-free "Green" construction | Complies with RoHS 2 and JEDEC J-STD-020 Level 1, enabling use in consumer and industrial eco-designs. |
Applications
| AC-DC Adapter Output Rectification | Industrial DC-DC Flyback Converter |
|---|---|
Use Scenario: 12V/1A isolated wall adapter for IoT gateways with universal 85–265VAC input. IC Role / Device Role / Timing Role: Primary output rectifier converting high-frequency transformer secondary voltage to regulated DC. Use Value: 1000V VRRM provides margin against reflected transients; 50ns trr reduces switching loss at 65kHz operation. | Use Scenario: 24V/0.8A auxiliary supply in PLC backplane with 300VDC bus input. IC Role / Device Role / Timing Role: Secondary-side rectifier in discontinuous conduction mode (DCM) flyback topology. Use Value: 1.0A IO and 30°C/W RθJT enable natural convection cooling without heatsink in sealed enclosures. |
| LED Driver Secondary Rectification | UPS Battery Charger Input Stage |
Use Scenario: Constant-current LED driver for street lighting with 300–400VDC bus and 36V/700mA output. IC Role / Device Role / Timing Role: Output rectifier in quasi-resonant flyback delivering tightly regulated current. Use Value: Low 1.7V VF improves efficiency over Schottky alternatives at >100V reverse stress where Schottky leakage dominates. | Use Scenario: 48V battery charger in telecom UPS with dual AC input redundancy and active PFC front-end. IC Role / Device Role / Timing Role: Isolation barrier rectifier in offline LLC resonant converter secondary. Use Value: 1000V rating accommodates reflected voltage spikes from transformer leakage inductance during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06 | Same 1000V VRRM, but 60ns trr and 1.85V VF @ 1.0A; TO-220AC package. | Requires through-hole mounting and external heatsink; unsuitable for high-density SMT designs. | Select when higher surge robustness (50A IFSM) outweighs board space constraints. |
| ES1J | Same SMA package and 600V VRRM, but 35ns trr and 1.7V VF; lower voltage rating limits use to ≤600V systems. | Not suitable for 1000V line-derived topologies (e.g., 3-phase rectified inputs or high-voltage DC links). | Select only for cost-sensitive 600V-class designs where faster recovery offsets lower voltage margin. |
Compared with STTH1R06 and ES1J, the US1M uniquely balances 1000V blocking, 50ns speed, and SMA SMT compatibility-making it optimal for space-constrained, high-input-voltage offline power supplies requiring no heatsink.
Availability
US1M is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, LED drivers, and UPS battery chargers requiring stable component supply and long-term production continuity.
Supply support for US1M 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The US1M belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency switching power supplies where low recovery loss and high voltage reliability are critical.
FAQ
What is the maximum junction temperature for continuous operation of the US1M?
The US1M has an operating junction temperature range of –65°C to +150°C. For continuous 1.0A average current, the terminal temperature must be held at or below +75°C per the derating curve; exceeding this requires thermal design mitigation such as copper pour or airflow.
Can the US1M replace a standard recovery rectifier like 1N4007 in a 100kHz flyback converter?
No-while both are 1A rectifiers, the 1N4007 has ~2μs reverse recovery time, causing excessive switching loss and overheating at 100kHz. The US1M's 50ns trr is essential for high-frequency operation and prevents thermal runaway in SMPS designs.
Is the US1M suitable for use in automotive applications?
The US1M is not AEC-Q101 qualified and lacks automotive-specific qualification testing (e.g., HTOL, temperature cycling). It may be used in non-safety-critical aftermarket accessories, but not in engine control, ADAS, or infotainment systems requiring automotive-grade reliability.
How does the US1M's forward voltage compare to Schottky diodes at 1.0A?
At 1.0A and +25°C, the US1M exhibits 1.7V VF, higher than typical Schottky diodes (0.4–0.8V). However, above ~100V reverse bias, Schottky leakage increases exponentially-making the US1M more efficient and stable in 600–1000V applications where Schottky devices fail.
US1M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diotec Semiconductor
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 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 @ 1000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -50°C ~ 150°C
US1M FAQ
1.How can I place an order for US1M through Aetrix?
Please submit a Request for Quotation (RFQ) for US1M 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 US1M reliable?
The price and inventory of US1M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1M is usually 5 days.
3.What payment methods are accepted for US1M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1M?
US1M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1M 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 US1M?
For technical support, including US1M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1M requirements.
6.How does Aetrix verify that US1M is sourced from the original manufacturer or authorized distributors?
All US1M 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 US1M meets industry standards.
7.What is the process for return or replacement of US1M?
All US1M units undergo pre-shipment inspection (PSI). If there is an issue with US1M, 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 US1M part is unused and in its original packaging.
Return procedure for US1M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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