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

Taiwan Semiconductor Corporation US1B R3G

Name: US1B R3G
Brand: Taiwan Semiconductor Corporation
SKU: US1B R3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: US1B R3G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: US1B R3G.pdf

Description:: DIODE GEN PURP 100V 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

US1B R3G from Taiwan Semiconductor is a 100 V, 1 A ultrafast surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring 50 ns reverse recovery time, 1.0 V max forward voltage at 1 A, and 30 A peak surge current - deployed in DC-DC converter output stages and snubber networks.

For engineers reviewing the US1B R3G datasheet, US1B R3G pinout, US1B R3G application, or US1B R3G equivalent, key selection criteria include repetitive peak reverse voltage (100 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 ultrafast rectifier uses a glass-passivated PN junction optimized for high-frequency switching operation. Its 50 ns reverse recovery time and low 1.0 V forward voltage drop minimize conduction and switching losses in 100 kHz–1 MHz SMPS topologies.

The DO-214AC (SMA) package provides 27 °C/W junction-to-lead thermal resistance and supports automated placement per J-STD-020 Level 1 moisture sensitivity. Cathode polarity is marked by a visible band on the molded body.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - maximum non-repetitive reverse voltage the device blocks without breakdown
I_F	1 A continuous - average forward current rating at T_L = 75 °C, defining steady-state power stage capacity
I_FSM	30 A - peak surge current handling for 8.3 ms half-sine, supporting inrush and fault transients
t_rr	50 ns - reverse recovery time at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, critical for EMI and efficiency in high-frequency converters
V_F	1.0 V max at I_F = 1 A, T_J = 25 °C - forward voltage drop directly impacts conduction loss and thermal load
R_θJA	75 °C/W - junction-to-ambient thermal resistance under standard PCB mounting, used to calculate max ambient temperature
T_J max	+150 °C - maximum allowable junction temperature, limiting power dissipation and reliability margin

Pinout & Package

DO-214AC (SMA) surface-mount package with molded epoxy body, matte tin-plated leads, and cathode polarity indicated by a single axial band. Weight: 0.060 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential node (e.g., switch node or ground return); must handle full 1 A DC and 30 A surge
Cathode	Forward current exit / reverse blocking terminal	Connected to higher-potential node (e.g., output rail); marked by visible band; sustains up to 100 V reverse bias

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable leakage performance and long-term reliability under thermal cycling and humidity stress
Ultrafast 50 ns t_rr	Reduces switching loss and EMI generation in high-frequency DC-DC converters operating above 200 kHz
Low 1.0 V V_F at 1 A	Lowers conduction loss by ~15% vs. standard fast rectifiers, improving efficiency in 12 V/24 V output stages
DO-214AC (SMA) package	Supports high-density automated assembly and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance
RoHS & halogen-free	Complies with IEC 61249-2-21 and EU RoHS Directive, enabling use in environmentally regulated industrial equipment

Applications

DC-DC Converter Output Rectification	Snubber Network Clamping
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V at up to 1 A. IC Role / Device Role / Timing Role: Unidirectional current path converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 50 ns t_rr and 1.0 V V_F reduce switching loss and improve light-load efficiency over standard fast diodes.	Use Scenario: Voltage clamping across MOSFET drain-source during turn-off in boost or flyback topologies. IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing inductive energy spikes to limit voltage overshoot. Use Value: 100 V V_RRM and 30 A I_FSM enable robust transient suppression without avalanche degradation.
Freewheeling Diode in Buck Regulators	Lighting Driver Flyback Snubber
Use Scenario: Freewheeling path for inductor current in non-synchronous buck converters powering industrial sensors or PLC I/O modules. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when high-side switch is off, maintaining continuous inductor current. Use Value: Low R_θJA (75 °C/W) and 150 °C T_Jmax allow sustained operation at 1 A in compact enclosed enclosures.	Use Scenario: Clamp diode in LED driver flyback circuits with 12–48 V input, used in streetlight or signage applications. IC Role / Device Role / Timing Role: Absorbs leakage inductance energy from primary winding to protect controller IC and MOSFET. Use Value: Glass passivation ensures stable IR < 5 µA at 25 °C, minimizing standby power loss in always-on lighting systems.

DC-DC Converter Output Rectification

Snubber Network Clamping

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V at up to 1 A.

IC Role / Device Role / Timing Role: Unidirectional current path converting high-frequency AC from transformer secondary into regulated DC output.

Use Value: 50 ns t_rr and 1.0 V V_F reduce switching loss and improve light-load efficiency over standard fast diodes.

Use Scenario: Voltage clamping across MOSFET drain-source during turn-off in boost or flyback topologies.

IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing inductive energy spikes to limit voltage overshoot.

Use Value: 100 V V_RRM and 30 A I_FSM enable robust transient suppression without avalanche degradation.

Freewheeling Diode in Buck Regulators

Lighting Driver Flyback Snubber

Use Scenario: Freewheeling path for inductor current in non-synchronous buck converters powering industrial sensors or PLC I/O modules.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when high-side switch is off, maintaining continuous inductor current.

Use Value: Low R_θJA (75 °C/W) and 150 °C T_Jmax allow sustained operation at 1 A in compact enclosed enclosures.

Use Scenario: Clamp diode in LED driver flyback circuits with 12–48 V input, used in streetlight or signage applications.

IC Role / Device Role / Timing Role: Absorbs leakage inductance energy from primary winding to protect controller IC and MOSFET.

Use Value: Glass passivation ensures stable IR < 5 µA at 25 °C, minimizing standby power loss in always-on lighting systems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04 (STMicroelectronics)	Same V_RRM (100 V), identical I_F (1 A), but t_rr = 35 ns (faster), V_F = 1.15 V (higher), R_θJA = 80 °C/W (worse)	Better suited for >500 kHz converters where recovery speed dominates loss budget	Select STTH1R04 only if t_rr reduction justifies higher V_F and thermal penalty
ES1B (ON Semiconductor)	Same DO-214AC package, V_RRM = 100 V, I_F = 1 A, t_rr = 35 ns, V_F = 1.05 V, R_θJA = 70 °C/W	Offers slightly better thermal performance and faster recovery, but tighter V_F tolerance may affect parallel operation	ES1B is preferred for thermally constrained layouts requiring margin below 75 °C/W

Compared with STTH1R04 and ES1B, US1B R3G delivers the lowest forward voltage (1.0 V max) and best thermal resistance (75 °C/W) among 100 V ultrafast SMA rectifiers - making it optimal for cost-sensitive, medium-frequency (100–300 kHz) industrial power supplies where conduction loss dominates.

Availability

US1B R3G is available at Aetrix Electronics and suitable for DC-DC converters, snubber networks, freewheeling paths, and lighting drivers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for US1B 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 US1x series was designed specifically for high-efficiency, high-frequency switching power supplies - emphasizing ultrafast recovery, low forward voltage, and robust thermal performance in compact surface-mount packages.

FAQ

What is the maximum repetitive peak reverse voltage rating for US1B R3G?

The US1B R3G has a maximum repetitive peak reverse voltage (V_RRM) of 100 V, verified per Taiwan Semiconductor's N2102 datasheet. This rating defines the highest reverse-bias voltage the device can block continuously without breakdown. Exceeding 100 V risks irreversible junction failure. The US1B R3G is not rated for 200 V or higher reverse conditions - those require US1D or higher variants.

Does US1B R3G support automated SMT placement, and what is its moisture sensitivity level?

Yes, US1B R3G is qualified for automated surface-mount placement per J-STD-020. Its moisture sensitivity level is Level 1 - meaning it can be stored indefinitely at ≤30 °C/85 % RH without dry-pack requirements. The DO-214AC (SMA) package features matte tin-plated leads compliant with J-STD-002 solderability standards, ensuring reliable reflow joint formation in high-volume manufacturing of US1B R3G-based assemblies.

What is the reverse recovery time (t_rr) of US1B R3G, and under what test conditions is it specified?

The reverse recovery time (t_rr) of US1B R3G is 50 ns, measured under the condition: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, per Taiwan Semiconductor's N2102 datasheet. This value applies to the US1A–US1G subgroup and reflects the time required for minority carriers to clear after forward conduction ceases - a critical parameter for minimizing switching loss and EMI in high-frequency converters using US1B R3G.

Is US1B R3G RoHS and halogen-free compliant?

Yes, US1B 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 lead content is below 1000 ppm. This compliance enables US1B R3G use in environmentally regulated industrial equipment, medical peripherals, and EU-market power supplies without material declaration concerns.

What is the junction-to-ambient thermal resistance (R_θJA) of US1B R3G, and how does it impact thermal design?

The junction-to-ambient thermal resistance (R_θJA) of US1B R3G is 75 °C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value determines the temperature rise from junction to ambient air for a given power dissipation - e.g., at 0.5 W loss, junction temperature rises 37.5 °C above ambient. Designers must ensure ambient temperature plus R_θJA × P_D stays below 150 °C to maintain US1B R3G reliability and lifetime.

US1B 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):: 100 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 @ 100 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

US1B R3G FAQ

1.How can I place an order for US1B R3G through Aetrix?

Please submit a Request for Quotation (RFQ) for US1B 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 US1B R3G reliable?

The price and inventory of US1B R3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1B R3G is usually 5 days.

3.What payment methods are accepted for US1B R3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1B R3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for US1B R3G?

US1B R3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your US1B 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 US1B R3G?

For technical support, including US1B R3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1B R3G requirements.

6.How does Aetrix verify that US1B R3G is sourced from the original manufacturer or authorized distributors?

All US1B 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 US1B R3G meets industry standards.

7.What is the process for return or replacement of US1B R3G?

All US1B R3G units undergo pre-shipment inspection (PSI). If there is an issue with US1B 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 US1B R3G part is unused and in its original packaging.

Return procedure for US1B R3G:

1.Submit a request within 90 days.

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

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