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Taiwan Semiconductor Corporation US1MH
- Part No.:
- US1MH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1MH.pdf
- Description:
- DIODE GEN PURP 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:11,000
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Product details
Overview
US1MH from Taiwan Semiconductor is a 1A, 1000V ultrafast surface-mount rectifier in DO-214AC (SMA) package, featuring 1.7V max forward voltage at 1A, 75ns reverse recovery time, and AEC-Q101 qualification for automotive snubber and freewheeling circuits.
For engineers reviewing the US1MH datasheet, US1MH pinout, US1MH application, or US1MH equivalent, key selection criteria include peak reverse voltage rating, thermal resistance (RθJL = 27°C/W), junction capacitance (10pF), and compliance with JESD201 Class 2 whisker testing and RoHS/Halogen-free standards.
Technical Context
The US1MH employs a glass-passivated single-die silicon junction optimized for high-efficiency switching in DC-DC converters and automotive lighting. Its 1000V VRRM and 75ns trr enable reliable operation under repetitive surge conditions up to 30A IFSM at 8.3ms half-sine waveform.
Thermal performance is defined by RθJA = 75°C/W and RθJL = 27°C/W, supporting sustained 1A conduction at TJ ≤ 150°C. Reverse leakage remains ≤5µA at 25°C and ≤150µA at 125°C under rated VR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - supports isolation in high-voltage DC bus and snubber networks |
| IF | 1 A continuous - suitable for low-to-medium power freewheeling paths |
| trr | 75 ns - enables efficient high-frequency switching up to ~2 MHz |
| VF (max) | 1.7 V @ 1A, 25°C - limits conduction loss to ≤1.7W per device at full load |
| RθJL | 27 °C/W - allows direct PCB copper pour heat sinking without heatsink |
| CJ | 10 pF @ 1MHz, 4V - minimizes capacitive coupling in fast-switching nodes |
| AEC-Q101 | Qualified - validated for automotive-grade reliability under temperature cycling and HTRB |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, cathode indicated by band, matte tin-plated leads, UL 94V-0 molding compound, 0.060g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of inductive load or switch node |
| Cathode | Current exit point during forward conduction; marked with band | Connected to higher-potential rail (e.g., VIN, VBUS) in freewheeling path |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast recovery (75ns) | Reduces switching losses and EMI in 100–500 kHz DC-DC topologies |
| Glass passivated junction | Ensures long-term stability of VF and IR under humidity and thermal stress |
| AEC-Q101 qualification | Validates robustness for under-hood automotive environments (−40°C to +125°C ambient) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without dry-pack or baking requirements |
| Halogen-free & RoHS compliant | Meets automotive OEM material declarations (IEC 61249-2-21, EU Directive 2011/65/EU) |
Applications
| Automotive LED Headlamp Driver | Industrial DC-DC Buck Converter |
|---|---|
Use Scenario: Freewheeling path in 48V-to-12V buck converter powering adaptive front lighting. IC Role / Device Role / Timing Role: Unidirectional current path during low-side switch off-time; clamps inductive kickback. Use Value: 1000V VRRM withstands transients >80V; 75ns trr prevents cross-conduction loss with Si MOSFET switches. | Use Scenario: Output rectification in isolated 24V input, 5V/3A flyback supply for PLC I/O modules. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement where control complexity is avoided. Use Value: 1.7V VF yields <1.7W dissipation at full load; DO-214AC footprint simplifies layout vs. through-hole alternatives. |
| Snubber Network in Motor Inverter | Freewheeling Diode in Automotive HVAC Blower |
Use Scenario: RC snubber across IGBT collector-emitter in 12V HVAC inverter driving PMSM fan motor. IC Role / Device Role / Timing Role: Fast turn-off clamp limiting dV/dt-induced false triggering during IGBT commutation. Use Value: 75ns trr ensures rapid voltage capture before IGBT re-enters conduction; 30A IFSM handles transient energy. | Use Scenario: Freewheeling path across brushed DC blower motor coil in vehicle cabin climate system. IC Role / Device Role / Timing Role: Provides safe discharge path for back-EMF when PWM drive is disabled. Use Value: AEC-Q101 qualification guarantees operation over −40°C to +125°C ambient; 150°C TJMAX supports sealed-motor thermal envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06 | Same 1A/600V rating but lower VRRM; 50ns trr; TO-220AC package | Limited to ≤600V systems; requires through-hole mounting and heatsinking | Select only if 600V rating suffices and board space allows larger footprint |
| ON Semi MUR110 | 1A/1000V, 75ns trr, DO-41 package; no AEC-Q101 qualification | Not qualified for automotive use; higher RθJA (~100°C/W) limits power density | Acceptable for industrial non-automotive freewheeling where qualification is not required |
Compared with STTH1R06 and MUR110, the US1MH uniquely combines 1000V rating, AEC-Q101 qualification, surface-mount DO-214AC packaging, and 75ns recovery-enabling compact, automotive-compliant designs without thermal derating penalties.
Availability
US1MH is available at Aetrix Electronics and suitable for automotive lighting, DC-DC converter design, and motor snubber applications requiring stable component supply across production lifecycles.
Supply support for US1MH 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 automotive, industrial, and consumer markets since 1979.
The US1MH belongs to TSC's US1xH ultrafast rectifier family, engineered specifically for high-reliability, high-voltage switching applications in automotive power electronics and industrial SMPS where fast recovery, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum junction temperature rating for US1MH?
The US1MH has a maximum junction temperature (TJMAX) of +150°C, verified per absolute maximum ratings in the official TSC datasheet Version A2102. This rating enables operation in under-hood automotive environments and high-ambient industrial settings. Derating curves confirm 1A continuous current is sustainable up to 125°C case temperature. The US1MH must be mounted on adequate copper area to maintain TJ ≤ 150°C under full load.
Is US1MH pin-compatible with other devices in the US1xH series?
Yes, all US1xH devices-including US1AH, US1BH, US1DH, US1GH, US1JH, US1KH, and US1MH-share identical DO-214AC (SMA) package dimensions, pinout, and solder pad layout. The only differences are VRRM (50V–1000V), VF (1.0–1.7V), and trr (50–75ns). This allows direct substitution within the same footprint when voltage and recovery requirements align. The US1MH marking code "US1M" identifies its 1000V rating.
Does US1MH meet automotive reliability standards?
Yes, US1MH is AEC-Q101 qualified per the official TSC documentation, confirming validation for automotive applications including temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock. It also meets JESD201 Class 2 whisker resistance and moisture sensitivity level 1 (per J-STD-020), eliminating bake requirements prior to reflow. These qualifications make US1MH suitable for engine control, lighting, and HVAC systems where field reliability is critical.
What is the typical junction capacitance of US1MH and why does it matter?
The US1MH exhibits a typical junction capacitance (CJ) of 10pF at 1MHz and 4V reverse bias. This low value minimizes displacement current and capacitive feedthrough in high-dV/dt switching nodes-critical in snubber circuits and freewheeling paths adjacent to fast-switching MOSFETs or IGBTs. Compared to lower-voltage US1xH variants (e.g., 15pF for US1GH), the reduced CJ improves EMI performance and reduces dynamic losses in high-frequency converters using the US1MH.
How does the forward voltage of US1MH compare across temperature and current?
The US1MH specifies a maximum forward voltage (VF) of 1.7V at IF = 1A and TJ = 25°C. As junction temperature rises, VF decreases slightly due to semiconductor physics-typical curves show ~1.55V at 125°C. At lower currents (e.g., 0.1A), VF drops to ~0.95V. This behavior is confirmed in Figure 4 (Typical Forward Characteristics) of the US1MH datasheet. Designers should reference this curve-not just the max spec-to model conduction loss accurately across operating conditions.
US1MH 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):
- 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:
- 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
US1MH FAQ
1.How can I place an order for US1MH through Aetrix?
Please submit a Request for Quotation (RFQ) for US1MH 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 US1MH reliable?
The price and inventory of US1MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1MH is usually 5 days.
3.What payment methods are accepted for US1MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1MH?
US1MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1MH 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 US1MH?
For technical support, including US1MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1MH requirements.
6.How does Aetrix verify that US1MH is sourced from the original manufacturer or authorized distributors?
All US1MH 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 US1MH meets industry standards.
7.What is the process for return or replacement of US1MH?
All US1MH units undergo pre-shipment inspection (PSI). If there is an issue with US1MH, 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 US1MH part is unused and in its original packaging.
Return procedure for US1MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
US1MH Tags
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1N4148WX-TP
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BAV21W-7-F
Diodes Incorporated
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