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Taiwan Semiconductor Corporation US1D
- Part No.:
- US1D
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1D.pdf
- Description:
- DIODE GEN PURP 200V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:12,533
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Product details
Overview
US1D from Taiwan Semiconductor is a 200 V, 1 A ultrafast surface-mount rectifier diode in DO-214AC (SMA) package, featuring 50 ns reverse recovery time, 1.0 V forward voltage at 1 A, and 30 A peak surge current - used for freewheeling and snubber circuits in DC-DC converters.
For engineers reviewing the US1D datasheet, US1D pinout, US1D application, or US1D equivalent, key selection criteria include repetitive peak reverse voltage (200 V), ultrafast recovery (≤50 ns), thermal resistance (RθJL = 27 °C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance.
Technical Context
The US1D is a single-die, glass-passivated silicon PN junction rectifier optimized for high-frequency switching applications. Its ultrafast recovery (trr ≤ 50 ns) and low forward voltage (VF ≤ 1.0 V @ 1 A, 25°C) minimize conduction and switching losses in SMPS topologies.
Designed for automated SMT assembly, it meets J-STD-002 solderability and JESD201 Class 2 whisker resistance. The DO-214AC (SMA) package supports 150°C maximum junction temperature and provides UL 94V-0 flammability-rated molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - maximum repetitive reverse blocking voltage without breakdown |
| IF | 1 A continuous - rated average forward current under specified thermal conditions |
| trr | 50 ns - ultrafast recovery enables efficient operation up to ~1 MHz switching frequencies |
| VF | 1.0 V @ 1 A, 25°C - low conduction loss reduces power dissipation in high-duty-cycle paths |
| RθJL | 27 °C/W - low junction-to-lead thermal resistance supports reliable power handling on standard PCB copper |
| IFSM | 30 A - withstands short-duration inrush/surge currents common during startup or fault events |
| Mechanical Package | DO-214AC (SMA) - industry-standard surface-mount outline with cathode band polarity marking |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two axial leads; cathode indicated by a band on the body; matte tin-plated terminals compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connects to lower-potential side of load or switch node in freewheeling path |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to higher-potential node (e.g., switch drain or output rail) |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances reliability and stability of reverse leakage (IR ≤ 5 µA @ 25°C) across temperature and humidity |
| Ultrafast recovery (trr ≤ 50 ns) | Reduces switching loss and EMI generation in high-frequency DC-DC converters and inverters |
| MSL Level 1 rating | Enables unlimited floor life and reflow compatibility without dry-pack or baking requirements |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for industrial and consumer end equipment |
| Junction temperature range | –55°C to +150°C operation supports deployment in automotive under-hood and industrial ambient environments |
Applications
| DC-DC Converter | Switching Inverter |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters operating at 100–500 kHz. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during MOSFET off-time to maintain output current continuity. Use Value: 50 ns trr and 1.0 V VF minimize switching loss and improve efficiency >90% at light-to-moderate loads. | Use Scenario: Output stage rectification in solar microinverters or UPS inverters with high-frequency PWM control. IC Role / Device Role / Timing Role: Unidirectional current steering during AC half-cycles; blocks reverse voltage during dead-time intervals. Use Value: 200 V VRRM and 30 A IFSM support 24–48 V input systems with transient overvoltage tolerance. |
| LED Driver Snubber | Inductive Load Freewheeling |
Use Scenario: RC-snubber network across MOSFET/IGBT switches driving constant-current LED strings. IC Role / Device Role / Timing Role: Clamps voltage spikes during turn-off by providing fast, low-loss discharge path for stored inductive energy. Use Value: Low CJ (15 pF) and fast trr prevent capacitive coupling noise while enabling rapid clamping response. | Use Scenario: Back-EMF suppression across solenoids, relays, or brushless DC motor windings. IC Role / Device Role / Timing Role: Provides low-impedance path for inductive kickback current when drive signal is removed. Use Value: 150°C TJMAX and robust IFSM rating ensure long-term reliability under repeated high-energy transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R02U (STMicroelectronics) | VRRM = 200 V, trr = 30 ns, VF = 0.95 V @ 1 A - faster recovery, slightly lower VF | Same DO-214AC footprint but tighter trr spec; better suited for >500 kHz designs | Select if higher switching frequency or lower conduction loss is prioritized over cost |
| ES1D (ON Semiconductor) | VRRM = 200 V, trr = 35 ns, VF = 0.92 V @ 1 A - lower VF and faster trr, MSL 1 confirmed | Identical package and pinout; validated for same lighting and converter use cases | Preferred where supply chain diversification or marginally improved efficiency is required |
Compared with STTH1R02U and ES1D, the US1D offers balanced performance at competitive cost, with verified 50 ns trr and 1.0 V VF suitable for 100–300 kHz industrial DC-DC and inverter designs where extreme speed is not mandatory.
Availability
US1D is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and LED driver snubber circuits requiring stable component supply, long-lifecycle availability, and full traceability.
Supply support for US1D 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 US1D belongs to TSC's US1x ultrafast rectifier family, engineered specifically for high-efficiency, high-frequency power conversion where low VF, fast trr, and robust thermal performance are critical.
FAQ
What is the maximum junction temperature rating for US1D?
The US1D has a maximum junction temperature (TJMAX) of +150°C, allowing operation in demanding thermal environments such as enclosed power supplies or under-hood automotive modules. This rating is supported by its RθJL of 27 °C/W and UL 94V-0 molding compound. Derating curves in the US1D datasheet define safe IF limits above 75°C ambient.
Does US1D meet RoHS and halogen-free requirements?
Yes, the US1D is RoHS compliant and halogen-free per IEC 61249-2-21. These certifications are explicitly stated in the official Taiwan Semiconductor documentation for the US1x series, including US1D. The device uses matte tin-plated leads and green molding compound, satisfying both environmental and reliability standards for modern industrial and consumer electronics.
What is the reverse recovery time (trr) specification for US1D?
The US1D has a maximum reverse recovery time (trr) of 50 ns under test conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This ultrafast recovery enables efficient operation in switching power supplies operating up to ~300 kHz. Measured values are typical at 25°C and may increase slightly at elevated junction temperatures.
Is US1D pin-compatible with other devices in the US1x family?
Yes, all US1x devices-including US1A, US1B, US1D, US1G, US1J, US1K, and US1M-share identical DO-214AC (SMA) packaging, pinout, and mechanical dimensions. Only VRRM, VF, trr, and CJ differ across variants. This allows direct substitution within the same board layout when voltage or performance requirements change.
What is the moisture sensitivity level (MSL) rating for US1D?
The US1D is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no dry-packaging or baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates yield risk from moisture-induced popcorning during assembly - a key advantage for high-volume SMT production.
US1D 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):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 200 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1D FAQ
1.How can I place an order for US1D through Aetrix?
Please submit a Request for Quotation (RFQ) for US1D 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 US1D reliable?
The price and inventory of US1D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1D is usually 5 days.
3.What payment methods are accepted for US1D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1D?
US1D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1D 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 US1D?
For technical support, including US1D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1D requirements.
6.How does Aetrix verify that US1D is sourced from the original manufacturer or authorized distributors?
All US1D 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 US1D meets industry standards.
7.What is the process for return or replacement of US1D?
All US1D units undergo pre-shipment inspection (PSI). If there is an issue with US1D, 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 US1D part is unused and in its original packaging.
Return procedure for US1D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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