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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation US1A R3G

Name: US1A R3G
Brand: Taiwan Semiconductor Corporation
SKU: US1A R3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: US1A R3G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: US1A R3G.pdf

Description:: DIODE GEN PURP 50V 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:6,247

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Product details

Overview

US1A R3G from Taiwan Semiconductor is a 1 A, 50 V ultrafast surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring 1.0 V max forward voltage at 1 A, 50 ns max reverse recovery time, and 30 A peak surge current - deployed in DC/DC converter freewheeling paths and snubber networks.

For engineers reviewing the US1A R3G datasheet, US1A R3G pinout, US1A R3G application, or US1A R3G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (R_θJA = 75 °C/W), junction temperature range (–55 to +150 °C), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

This discrete rectifier operates as a single-die, unidirectional switching device with glass-passivated junction for enhanced reliability under repetitive surge stress. Its ultrafast recovery (t_rr ≤ 50 ns) minimizes switching losses in high-frequency SMPS topologies operating up to several hundred kHz.

The DO-214AC (SMA) package provides standardized surface-mount compatibility, matte tin-plated leads compliant with J-STD-002 solderability, and UL 94V-0 molding compound - supporting automated placement and reflow profiles per J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - maximum repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling clamp circuits
I_F	1 A continuous - average forward current rating at T_A = 25 °C; derates linearly above 25 °C per forward current curve
t_rr	≤ 50 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables efficient operation in ≥200 kHz switchers
V_F	≤ 1.0 V at I_F = 1 A, T_J = 25 °C - low conduction loss improves system efficiency and reduces thermal load
R_θJA	75 °C/W - junction-to-ambient thermal resistance; determines heatsinking requirements on standard FR-4 PCB
I_FSM	30 A - non-repetitive peak surge current (8.3 ms half-sine); withstands startup/inrush transients without failure

Pinout & Package

DO-214AC (SMA) package: molded plastic case with axial leads formed into gull-wing configuration; cathode indicated by band; weight ≈ 0.060 g; UL 94V-0 rated compound.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck freewheel path)
Cathode	Forward current exit / reverse blocking terminal	Banded end; connects to output rail or energy storage node; blocks reverse voltage up to 50 V

Key Features

Feature	Design Value
Glass-passivated junction	Enhances long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments
Ultrafast recovery (t_rr ≤ 50 ns)	Reduces reverse recovery charge (Q_rr) and associated switching losses in high-frequency converters
Moisture sensitivity level 1	Enables direct use from dry pack without baking; supports standard SMT assembly without process modification
RoHS and halogen-free	Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for export-constrained industrial and lighting products

Applications

DC/DC Converter Freewheeling	Snubber Network Clamping
Use Scenario: Used across synchronous rectifier outputs or in asynchronous buck/boost converters to conduct inductive current during low-side switch off-time. IC Role / Device Role / Timing Role: Unidirectional current path enabling energy transfer from inductor to output capacitor; timing-critical during sub-100 ns dead-time intervals. Use Value: 50 ns t_rr prevents reverse conduction overlap with high-side switch, reducing shoot-through risk and conduction loss.	Use Scenario: Placed across MOSFET drain-source or transformer windings to absorb voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Fast clamping element that turns on within nanoseconds of overvoltage event to divert transient energy. Use Value: Low V_F (≤1.0 V) ensures minimal clamping voltage overshoot while sustaining 30 A surge capability.
Switching Mode Inverter Output	LED Driver Flyback Secondary
Use Scenario: Rectifies high-frequency AC from inverter H-bridge output to feed DC bus or motor winding. IC Role / Device Role / Timing Role: High-speed unidirectional conduction path synchronized to PWM carrier frequency (typically 20–100 kHz). Use Value: 75 °C/W R_θJA allows operation at full 1 A load on 1-in² copper area without forced air cooling.	Use Scenario: Secondary-side rectification in isolated LED drivers where compact size and low leakage are critical. IC Role / Device Role / Timing Role: Converts transformer-reflected AC to regulated DC for constant-current LED string drive. Use Value: 5 µA max reverse leakage at 25 °C ensures stable open-circuit voltage and prevents false triggering in feedback loops.

DC/DC Converter Freewheeling

Snubber Network Clamping

Use Scenario: Used across synchronous rectifier outputs or in asynchronous buck/boost converters to conduct inductive current during low-side switch off-time.

IC Role / Device Role / Timing Role: Unidirectional current path enabling energy transfer from inductor to output capacitor; timing-critical during sub-100 ns dead-time intervals.

Use Value: 50 ns t_rr prevents reverse conduction overlap with high-side switch, reducing shoot-through risk and conduction loss.

Use Scenario: Placed across MOSFET drain-source or transformer windings to absorb voltage spikes during switching transitions.

IC Role / Device Role / Timing Role: Fast clamping element that turns on within nanoseconds of overvoltage event to divert transient energy.

Use Value: Low V_F (≤1.0 V) ensures minimal clamping voltage overshoot while sustaining 30 A surge capability.

Switching Mode Inverter Output

LED Driver Flyback Secondary

Use Scenario: Rectifies high-frequency AC from inverter H-bridge output to feed DC bus or motor winding.

IC Role / Device Role / Timing Role: High-speed unidirectional conduction path synchronized to PWM carrier frequency (typically 20–100 kHz).

Use Value: 75 °C/W R_θJA allows operation at full 1 A load on 1-in² copper area without forced air cooling.

Use Scenario: Secondary-side rectification in isolated LED drivers where compact size and low leakage are critical.

IC Role / Device Role / Timing Role: Converts transformer-reflected AC to regulated DC for constant-current LED string drive.

Use Value: 5 µA max reverse leakage at 25 °C ensures stable open-circuit voltage and prevents false triggering in feedback loops.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06U	Same 1 A / 600 V rating but higher V_F (1.3 V typ), slower t_rr (70 ns), TO-277 package	Higher voltage margin suits 400 V bus systems; unsuitable for 50 V designs due to excessive V_F penalty	Select when V_RRM > 100 V required and board space permits larger footprint
MBR140	1 A / 40 V Schottky; V_F = 0.55 V typ, no recovery time, but V_RRM too low for 50 V-rated circuits	Lower conduction loss ideal for <30 V outputs; cannot replace US1A R3G in 50 V reverse-biased positions	Choose only if reverse voltage stress remains <35 V and efficiency is prioritized over voltage margin

Compared with STTH1R06U and MBR140, US1A R3G uniquely balances 50 V blocking, 1.0 V V_F, and 50 ns t_rr in the compact DO-214AC package - making it optimal for cost-sensitive, space-constrained 50 V DC/DC and snubber applications where Schottky leakage or higher-voltage ultrafast trade-offs are unacceptable.

Availability

US1A R3G is available at Aetrix Electronics and suitable for DC/DC converters, snubber networks, and LED driver flyback secondaries requiring stable component supply with consistent parametric performance across production lots.

Supply support for US1A R3G 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 diodes, and MOSFETs for industrial and consumer markets.

The US1A R3G belongs to TSC's US1x ultrafast rectifier family, engineered specifically for high-efficiency, high-frequency switching power supplies where fast recovery, low forward drop, and robust surge handling are essential.

FAQ

What is the maximum junction temperature rating for US1A R3G?

The US1A R3G has a maximum junction temperature (T_J) of +150 °C and a minimum of –55 °C. This wide operating range allows deployment in industrial environments with ambient temperatures up to +85 °C when properly derated per the forward current derating curve. The US1A R3G maintains reliable operation under sustained thermal stress due to its glass-passivated junction and DO-214AC package thermal performance.

Is US1A R3G RoHS and halogen-free compliant?

Yes, US1A R3G is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and all plating meets EU RoHS Directive limits. This compliance is verified in Taiwan Semiconductor's official documentation and supported by material declarations available upon request for US1A R3G.

What does the 'R3G' suffix indicate in US1A R3G?

The 'R3G' suffix in US1A R3G denotes Taiwan Semiconductor's standard tape-and-reel packaging: R3 = 7,500 units per reel, G = green compound (halogen-free). It does not affect electrical specifications - all US1A devices share identical V_RRM, t_rr, V_F, and thermal ratings regardless of reel code. US1A R3G is functionally identical to US1A in DO-214AC packaging.

Can US1A R3G be used in place of a Schottky diode like MBR130?

No - US1A R3G is a silicon PN junction ultrafast rectifier, not a Schottky. While both handle 1 A, US1A R3G has higher V_F (≤1.0 V vs. ~0.45 V) and finite t_rr (50 ns), whereas MBR130 offers near-zero recovery but only 30 V V_RRM. Substituting US1A R3G for MBR130 in ≤30 V circuits increases conduction loss; using MBR130 in 50 V circuits risks avalanche failure. US1A R3G is not a drop-in replacement for Schottky diodes.

What is the reverse leakage current specification for US1A R3G at elevated temperature?

At T_J = 125 °C and rated V_R = 50 V, US1A R3G exhibits a maximum reverse leakage current (I_R) of 150 µA. At 25 °C, the limit is 5 µA. This temperature-dependent leakage is critical in snubber and high-impedance bias networks - designers must verify system stability under worst-case thermal conditions using the US1A R3G's published reverse characteristics curve.

US1A R3G 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

Operating Temperature - Junction:: -55°C ~ 150°C

US1A R3G FAQ

1.How can I place an order for US1A R3G through Aetrix?

Please submit a Request for Quotation (RFQ) for US1A R3G 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 US1A R3G reliable?

The price and inventory of US1A R3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1A R3G is usually 5 days.

3.What payment methods are accepted for US1A R3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1A R3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for US1A R3G?

US1A R3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your US1A R3G 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 US1A R3G?

For technical support, including US1A R3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1A R3G requirements.

6.How does Aetrix verify that US1A R3G is sourced from the original manufacturer or authorized distributors?

All US1A R3G 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 US1A R3G meets industry standards.

7.What is the process for return or replacement of US1A R3G?

All US1A R3G units undergo pre-shipment inspection (PSI). If there is an issue with US1A R3G, 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 US1A R3G part is unused and in its original packaging.

Return procedure for US1A R3G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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