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Taiwan Semiconductor Corporation US1AHR3G
- Part No.:
- US1AHR3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1AHR3G.pdf
- Description:
- DIODE GEN PURP 50V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,347
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Product details
Overview
US1AHR3G from Taiwan Semiconductor is a 1 A, 50 V ultrafast surface-mount rectifier diode in DO-214AC (SMA) package, featuring 1.0 V max forward voltage at 1 A, 50 ns reverse recovery time, and 30 A peak surge current - deployed in DC-DC converter output stages for high-efficiency power conversion.
For engineers reviewing the US1AHR3G datasheet, US1AHR3G pinout, US1AHR3G application, or US1AHR3G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (RθJA = 75 °C/W), junction temperature range (–55 to +150 °C), and moisture sensitivity level (J-STD-020 Level 1).
Technical Context
This single-die, glass-passivated PN junction rectifier operates as a unidirectional freewheeling or snubber device in switching power supplies. Its ultrafast recovery (trr ≤ 50 ns) minimizes switching losses during high-frequency PWM operation, while low VF reduces conduction loss at 1 A DC output current.
The DO-214AC (SMA) package provides robust thermal performance with RθJL = 27 °C/W and meets UL 94V-0 flammability rating. Cathode band polarity marking and matte tin-plated leads ensure compatibility with automated SMT assembly and J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Current (IF) | 1 A continuous - supports stable output rectification in compact 12 V/24 V DC-DC modules |
| Repetitive Peak Reverse Voltage (VRRM) | 50 V - rated for use in low-voltage secondary-side rectification with margin against transient spikes |
| Forward Voltage (VF) | ≤ 1.0 V @ 1 A, 25 °C - limits conduction loss to ≤1 W per diode in high-duty-cycle operation |
| Reverse Recovery Time (trr) | ≤ 50 ns - enables efficient operation up to ~500 kHz switching frequency without excessive ringing |
| Junction-to-Ambient Thermal Resistance (RθJA) | 75 °C/W - requires minimal copper area (≥25 mm²) on standard FR-4 for safe 1 A operation at 70 °C ambient |
| Peak Forward Surge Current (IFSM) | 30 A @ 8.3 ms half-sine - withstands inrush and fault currents in industrial power supplies |
| Junction Temperature Range (TJ) | –55 to +150 °C - qualified for extended-temperature industrial and automotive under-hood auxiliary circuits |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Input terminal for forward conduction | Connected to switch node or transformer secondary winding; carries full load current during on-state |
| Cathode (K) | Output terminal for forward conduction | Connected to output capacitor or filter inductor; defines output polarity and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable leakage performance (<5 µA @ 25 °C) and long-term reliability under humid conditions |
| Ultrafast recovery (trr ≤ 50 ns) | Reduces switching loss and EMI generation in high-frequency SMPS designs (>200 kHz) |
| Moisture Sensitivity Level 1 | Allows indefinite floor life before reflow; no baking required prior to SMT assembly |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for industrial and building automation equipment enclosures |
| Matte tin plating (J-STD-002) | Ensures consistent wetting and void-free solder joints in lead-free reflow profiles |
Applications
| DC-DC Converter Output Rectification | Snubber Network Clamping |
|---|---|
Use Scenario: Used in synchronous or asynchronous buck converter outputs delivering 3.3–12 V at up to 1 A. IC Role / Device Role: Freewheeling rectifier that conducts during low-side switch off-time to maintain inductor current continuity. Use Value: Low VF (≤1.0 V) and fast trr (≤50 ns) minimize power loss and voltage overshoot across the output inductor. | Use Scenario: Placed across MOSFET drain-source or transformer primary windings in flyback or forward converters. IC Role / Device Role: Clamp transient voltage spikes during switch turn-off by providing controlled reverse conduction path. Use Value: Tight VRRM tolerance (50 V) and low CJ (15 pF) enable precise clamping without slowing switching edges. |
| Lighting Driver Freewheeling | Industrial Inverter Auxiliary Supply |
Use Scenario: Integrated into constant-current LED driver secondary side for AC/DC or DC/DC isolation stages. IC Role / Device Role: Output rectifier handling pulsed 1 A loads with high thermal cycling duty. Use Value: TJ rating up to +150 °C and MSL Level 1 support reliable operation in enclosed LED housings with limited airflow. | Use Scenario: Supplies isolated 5 V/12 V bias rails for gate drivers and control ICs in motor inverters. IC Role / Device Role: Secondary-side rectifier converting transformer output to stable DC for auxiliary circuitry. Use Value: 30 A IFSM withstands startup surges and short-circuit transients common in industrial power-up sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06U | VRRM = 600 V, trr = 65 ns, VF = 1.15 V @ 1 A - higher voltage rating but slower recovery and higher conduction loss | Suitable for 400 V bus snubbers or PFC boost diodes; over-specified for 50 V output rectification | Select when higher reverse voltage margin is needed; avoid if minimizing switching loss is critical |
| MBR150 | Schottky structure, VF = 0.55 V @ 1 A, VRRM = 50 V, but IR = 100 µA @ 125 °C - lower loss but higher leakage at elevated temperature | Better for low-VF priority in ambient-temperature-limited designs; unsuitable for high-temp freewheeling | Prefer where efficiency >125 °C is not required; avoid in sealed industrial enclosures above 85 °C ambient |
Compared with STTH1R06U and MBR150, US1AHR3G delivers optimal balance of low VF, fast trr, and tight thermal derating for 50 V-class DC-DC outputs - offering lower system-level EMI than the 600 V alternative and superior high-temperature stability versus the Schottky option.
Availability
US1AHR3G is available at Aetrix Electronics and suitable for DC-DC converter output rectification, snubber network clamping, and lighting driver freewheeling requiring stable component supply across industrial, automotive auxiliary, and building automation programs.
Supply support for US1AHR3G 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, specializing in power rectifiers, TVS devices, and MOSFETs since 1979.
The US1x series was designed specifically for high-frequency, high-reliability surface-mount rectification in space-constrained power supplies - emphasizing ultrafast recovery, low thermal resistance, and automated assembly compatibility.
FAQ
What is the maximum junction temperature rating for US1AHR3G?
The US1AHR3G has a maximum junction temperature (TJ) of +150 °C and a minimum of –55 °C. This wide operating range allows deployment in industrial environments with elevated ambient temperatures, such as enclosed motor drives or LED luminaires. The US1AHR3G maintains specified electrical performance within this full range, provided thermal design respects RθJA = 75 °C/W and layout supports adequate heat dissipation.
Is US1AHR3G compatible with lead-free reflow soldering processes?
Yes, US1AHR3G features matte tin-plated leads qualified to J-STD-002 for solderability and is rated for lead-free reflow profiles (peak temperature up to 260 °C). Its moisture sensitivity level is J-STD-020 Level 1, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly - simplifying manufacturing logistics for the US1AHR3G in high-volume SMT lines.
What does the 'HR3G' suffix indicate in US1AHR3G?
The 'HR3G' suffix in US1AHR3G denotes Taiwan Semiconductor's tape-and-reel packaging variant: 'H' = halogen-free, 'R3' = 7,500 units per reel, and 'G' = green compound (RoHS-compliant molding material). This distinguishes it from bulk or ammo-pack versions and confirms compliance with IEC 61249-2-21. The core electrical and thermal specs of US1AHR3G remain identical to the base US1A part.
How does US1AHR3G compare to standard recovery rectifiers in switching applications?
US1AHR3G achieves ≤50 ns reverse recovery time versus >500 ns for standard recovery diodes, drastically reducing switching losses and voltage overshoot in high-frequency converters. Its low VF (≤1.0 V) and tight thermal resistance also improve efficiency over general-purpose rectifiers like 1N4007. For designs operating above 100 kHz, US1AHR3G delivers measurable improvements in both thermal performance and EMI profile compared to non-ultrafast alternatives.
Can US1AHR3G be used in place of a Schottky diode in low-voltage rectification?
US1AHR3G may replace Schottky diodes in 50 V-class applications where high-temperature leakage is a concern - its reverse current remains ≤5 µA at 25 °C and ≤150 µA at 125 °C, far below typical Schottky leakage. However, its VF (≤1.0 V) is higher than Schottky equivalents (~0.5 V), so US1AHR3G is preferred when thermal stability outweighs minimal conduction loss, especially above 85 °C ambient.
US1AHR3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 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 @ 50 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1AHR3G FAQ
1.How can I place an order for US1AHR3G through Aetrix?
Please submit a Request for Quotation (RFQ) for US1AHR3G 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 US1AHR3G reliable?
The price and inventory of US1AHR3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1AHR3G is usually 5 days.
3.What payment methods are accepted for US1AHR3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1AHR3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1AHR3G?
US1AHR3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1AHR3G 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 US1AHR3G?
For technical support, including US1AHR3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1AHR3G requirements.
6.How does Aetrix verify that US1AHR3G is sourced from the original manufacturer or authorized distributors?
All US1AHR3G 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 US1AHR3G meets industry standards.
7.What is the process for return or replacement of US1AHR3G?
All US1AHR3G units undergo pre-shipment inspection (PSI). If there is an issue with US1AHR3G, 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 US1AHR3G part is unused and in its original packaging.
Return procedure for US1AHR3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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