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

Taiwan Semiconductor Corporation US1G R3G

Name: US1G R3G
Brand: Taiwan Semiconductor Corporation
SKU: US1G R3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: US1G R3G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: US1G R3G.pdf

Description:: DIODE GEN PURP 400V 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

US1G R3G from Taiwan Semiconductor is a 1 A, 400 V ultrafast surface-mount rectifier diode in DO-214AC (SMA) package, featuring 50 ns reverse recovery time, 1.0 V typical forward voltage at 1 A, and 5 µA max reverse leakage at 25°C - deployed in DC-DC converter output stages and snubber networks.

For engineers reviewing the US1G R3G datasheet, US1G R3G pinout, US1G R3G application, or US1G R3G equivalent, key selection criteria include repetitive peak reverse voltage (400 V), thermal resistance (R_θJA = 75 °C/W), junction temperature range (–55 to +150 °C), and moisture sensitivity level (J-STD-020 Level 1).

Technical Context

This discrete silicon rectifier uses a glass-passivated PN junction optimized for high-frequency switching operation. Its ultrafast recovery (t_rr ≤ 50 ns) minimizes switching losses in PWM-based topologies, while the DO-214AC package supports automated placement and meets UL 94V-0 flammability requirements.

The device operates with single-die configuration and cathode-band polarity marking. Thermal performance is defined by R_θJL = 27 °C/W and R_θJA = 75 °C/W, enabling reliable 1 A continuous conduction in ambient temperatures up to 75°C without derating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse voltage the diode blocks without breakdown; sets upper limit for input/output voltage rails in flyback or buck converters
I_F	1 A - average forward current rating; defines continuous DC output capability in low-power SMPS designs
t_rr	≤ 50 ns - ultrafast reverse recovery time; reduces switching loss and EMI in 100–500 kHz switching applications
V_F	1.0 V typ @ 1 A, 25°C - low forward drop improves efficiency and reduces thermal load on PCB traces and heatsinking
I_R	5 µA max @ 400 V, 25°C - low leakage preserves hold-up energy in standby and light-load conditions
R_θJA	75 °C/W - junction-to-ambient thermal resistance; determines required copper area and airflow for thermal management

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration with cathode band marking. Matte tin-plated leads, J-STD-002 solderable, weight ≈ 0.060 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node or ground return); must handle full 1 A RMS current path
Cathode	Forward current exit / reverse blocking terminal	Marked by band; connects to higher-potential rail (e.g., output capacitor positive or V_IN); sustains 400 V reverse bias

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments
Ultrafast t_rr ≤ 50 ns	Reduces turn-off loss and di/dt-induced ringing in synchronous rectifier and active clamp circuits
J-STD-020 Level 1 MSL	Allows unlimited floor life before reflow; eliminates bake-out requirement for SMT assembly lines
Halogen-free (IEC 61249-2-21)	Complies with RoHS and WEEE directives; supports green manufacturing and end-of-life recycling programs

Applications

DC-DC Converter Output Rectification	Snubber Network Clamping
Use Scenario: Used as secondary-side rectifier in isolated 5–24 V, 1–5 W flyback converters powering IoT sensors and USB-C accessories. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts only during positive half-cycle of reflected voltage. Use Value: 1.0 V V_F limits conduction loss to <1 W at 1 A, while 50 ns t_rr prevents cross-conduction with primary-side MOSFET.	Use Scenario: Placed across MOSFET drain-source in boost PFC stage to absorb inductive kick during turn-off. IC Role / Device Role / Timing Role: Voltage-clamping diode that conducts transient energy into RC network; activated only during nanosecond-scale voltage spikes. Use Value: 400 V V_RRM withstands >350 V bus transients; low C_J (15 pF) avoids capacitive loading of gate drive signal.
Freewheeling in Buck Regulators	LED Driver Flyback Secondary
Use Scenario: Freewheel path for inductor current in 12 V → 3.3 V/2 A buck converter supplying FPGA I/O banks. IC Role / Device Role / Timing Role: Provides low-impedance return path when high-side switch is off; conducts continuously during off-time. Use Value: 1 A I_F rating matches peak inductor current; 75 °C/W R_θJA allows operation with 2 cm² 2-oz copper pour.	Use Scenario: Secondary-side rectifier in constant-current LED driver for architectural lighting (24 V, 350 mA, 12 LEDs in series). IC Role / Device Role / Timing Role: Converts high-frequency transformer output to steady DC for LED string; blocks reverse voltage during primary conduction phase. Use Value: 5 µA I_R at 125°C ensures minimal dark-current degradation over 50,000-hour lifetime; DO-214AC enables compact 2-layer PCB layout.

DC-DC Converter Output Rectification

Snubber Network Clamping

Use Scenario: Used as secondary-side rectifier in isolated 5–24 V, 1–5 W flyback converters powering IoT sensors and USB-C accessories.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts only during positive half-cycle of reflected voltage.

Use Value: 1.0 V V_F limits conduction loss to <1 W at 1 A, while 50 ns t_rr prevents cross-conduction with primary-side MOSFET.

Use Scenario: Placed across MOSFET drain-source in boost PFC stage to absorb inductive kick during turn-off.

IC Role / Device Role / Timing Role: Voltage-clamping diode that conducts transient energy into RC network; activated only during nanosecond-scale voltage spikes.

Use Value: 400 V V_RRM withstands >350 V bus transients; low C_J (15 pF) avoids capacitive loading of gate drive signal.

Freewheeling in Buck Regulators

LED Driver Flyback Secondary

Use Scenario: Freewheel path for inductor current in 12 V → 3.3 V/2 A buck converter supplying FPGA I/O banks.

IC Role / Device Role / Timing Role: Provides low-impedance return path when high-side switch is off; conducts continuously during off-time.

Use Value: 1 A I_F rating matches peak inductor current; 75 °C/W R_θJA allows operation with 2 cm² 2-oz copper pour.

Use Scenario: Secondary-side rectifier in constant-current LED driver for architectural lighting (24 V, 350 mA, 12 LEDs in series).

IC Role / Device Role / Timing Role: Converts high-frequency transformer output to steady DC for LED string; blocks reverse voltage during primary conduction phase.

Use Value: 5 µA I_R at 125°C ensures minimal dark-current degradation over 50,000-hour lifetime; DO-214AC enables compact 2-layer PCB layout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	Same 1 A / 400 V rating; t_rr = 35 ns (faster), V_F = 1.15 V (higher), R_θJA = 80 °C/W (worse)	Better for >300 kHz designs where recovery speed dominates; less suitable for thermally constrained layouts	Prefer STTH1R04 when minimizing EMI in high-frequency SMPS; retain US1G R3G for cost-sensitive, space-constrained, or high-temperature ambient use
ES1D-E3/57T	Same DO-214AC package; V_RRM = 200 V (lower), t_rr = 35 ns, V_F = 0.95 V (lower)	Limited to ≤200 V systems (e.g., 12–48 V telecom); not suitable for 375 V DC-link or universal-input AC-DC	Select ES1D-E3/57T only in 200 V-rated applications where lower V_F justifies reduced voltage margin; US1G R3G remains mandatory for 400 V compliance

Compared with STTH1R04 and ES1D-E3/57T, US1G R3G delivers optimal balance of voltage margin (400 V), thermal robustness (75 °C/W), and manufacturability (MSL Level 1), making it preferred for industrial DC-DC and lighting power supplies where reliability and assembly yield are critical.

Availability

US1G R3G is available at Aetrix Electronics and suitable for DC-DC converters, snubber networks, freewheeling paths, and LED driver secondary rectification requiring stable component supply and J-STD-020 Level 1 handling.

Supply support for US1G 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, serving industrial, computing, and consumer markets since 1979.

The US1x family was designed specifically for high-efficiency, high-frequency switching power supplies - emphasizing ultrafast recovery, low V_F, and robust thermal performance in compact surface-mount packages.

FAQ

What is the maximum junction temperature rating for US1G R3G?

The US1G R3G has a maximum junction temperature (T_J) of +150°C and a minimum of –55°C. This wide operating range allows deployment in automotive under-hood modules, industrial motor drives, and outdoor LED lighting where ambient temperatures exceed 85°C. Derating begins above 75°C ambient per the forward current derating curve in the US1A–US1M datasheet.

Is US1G R3G RoHS and halogen-free compliant?

Yes, US1G R3G is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and the matte tin-plated leads meet J-STD-002 solderability requirements. These certifications are verified in TSC's material declarations and supported by third-party test reports.

What does the 'R3G' suffix indicate in US1G R3G?

The 'R3G' suffix in US1G R3G denotes Taiwan Semiconductor's internal tape-and-reel packaging code: R3 indicates 7,500 units per reel, and G signifies green compound (halogen-free epoxy). It does not affect electrical specifications - all US1G devices share identical V_RRM = 400 V, t_rr ≤ 50 ns, and V_F = 1.0 V characteristics regardless of reel suffix.

Can US1G R3G replace US1J in a 600 V design?

No, US1G R3G cannot replace US1J in a 600 V design. US1G R3G has V_RRM = 400 V, while US1J is rated for 600 V. Using US1G R3G in a 600 V circuit risks catastrophic reverse breakdown during transients or line surges. Always match V_RRM to the peak system voltage plus safety margin - US1J or US1K would be appropriate alternatives for 600 V applications.

What is the reverse recovery time test condition for US1G R3G?

The reverse recovery time (t_rr) for US1G R3G is measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, per the US1A–US1M datasheet. This standardized condition reflects real-world switching behavior in flyback and buck converters. The specified maximum is 50 ns, with typical values near 35 ns at 25°C junction temperature.

US1G 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):: 400 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 @ 400 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

US1G R3G FAQ

1.How can I place an order for US1G R3G through Aetrix?

Please submit a Request for Quotation (RFQ) for US1G 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 US1G R3G reliable?

The price and inventory of US1G R3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1G R3G is usually 5 days.

3.What payment methods are accepted for US1G R3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1G R3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for US1G R3G?

US1G R3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your US1G 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 US1G R3G?

For technical support, including US1G R3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1G R3G requirements.

6.How does Aetrix verify that US1G R3G is sourced from the original manufacturer or authorized distributors?

All US1G 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 US1G R3G meets industry standards.

7.What is the process for return or replacement of US1G R3G?

All US1G R3G units undergo pre-shipment inspection (PSI). If there is an issue with US1G 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 US1G R3G part is unused and in its original packaging.

Return procedure for US1G R3G:

1.Submit a request within 90 days.

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

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