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

Taiwan Semiconductor Corporation FR304G-K

Name: FR304G-K
Brand: Taiwan Semiconductor Corporation
SKU: FR304G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FR304G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: FR304G-K.pdf

Description:: 150NS, 3A, 400V, FAST RECOVERY R

Quantity:: RFQ Add To RFQ list

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Inventory:9,696

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Product details

Overview

FR304G-K from Taiwan Semiconductor is a fast recovery rectifier diode with 400 V repetitive peak reverse voltage (V_RRM), 3 A average forward current (I_F), and 150 ns reverse recovery time (t_rr) measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A - used in high-efficiency DC-DC converters and switching-mode inverters.

For engineers reviewing the FR304G-K datasheet, FR304G-K pinout, FR304G-K application, or FR304G-K equivalent, key selection criteria include its DO-201AD package, 1.3 V max forward voltage at 3 A, 5 µA max reverse leakage at 25°C, thermal resistance of 35°C/W, and suitability for industrial power supplies requiring fast switching and low conduction loss.

Technical Context

The FR304G-K employs a single-die silicon PN junction structure optimized for fast recovery performance, achieving t_rr = 150 ns under standardized test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). Its 400 V V_RRM rating supports medium-voltage SMPS front-end and output rectification stages.

Thermally, it features a DO-201AD package with R_θJA = 35°C/W and operates across –55°C to +150°C junction temperature range. The device uses pure tin-plated leads compliant with J-STD-002 and passes JESD 201 Class 1A whisker testing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse voltage the diode blocks without breakdown in normal operation
I_F	3 A - continuous average forward current capability at case temperature ≤ 75°C
t_rr	150 ns - measured recovery time under specified IF/IR/Irr conditions; enables efficient high-frequency switching
V_F max	1.3 V @ 3 A, 25°C - determines conduction loss and thermal rise in power stage design
I_R max	5 µA @ 400 V, 25°C - low leakage preserves efficiency in standby and light-load conditions
R_θJA	35°C/W - defines thermal bottleneck from junction to ambient; guides heatsinking requirements
I_FSM	125 A @ 8.3 ms - surge rating for handling inrush or transient overloads without failure

Pinout & Package

FR304G-K is housed in a DO-201AD axial-leaded package with cathode indicated by a band on the body. Leads are pure tin-plated and solderable per J-STD-002; molding compound meets UL 94V-0.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node)
Cathode	Forward current exit / reverse blocking terminal	Marked with band; connects to output rail or filter capacitor positive; blocks 400 V reverse voltage

Key Features

Feature	Design Value
Fast recovery time	150 ns enables use in 100–500 kHz SMPS designs without excessive switching loss
Low forward voltage	1.3 V max at 3 A reduces conduction loss and improves system efficiency
High surge capability	125 A non-repetitive surge rating protects against line transients and startup inrush
RoHS & halogen-free	Complies with IEC 61249-2-21; suitable for environmentally regulated industrial and consumer products

Applications

AC-DC Adapter Power Supply	DC-DC Buck Converter Output Rectification
Use Scenario: Secondary-side rectification in 12–24 V, 30–60 W wall adapters with universal input. IC Role / Device Role / Timing Role: Fast recovery rectifier replacing standard PN diodes to reduce switching losses. Use Value: 150 ns t_rr and 1.3 V V_F improve full-load efficiency by ~1.2% versus slower alternatives.	Use Scenario: Synchronous rectification alternative in isolated 5 V/3 A buck-derived outputs. IC Role / Device Role / Timing Role: Discrete freewheeling diode in non-synchronous buck or flyback topologies. Use Value: DO-201AD footprint allows direct replacement of legacy rectifiers without PCB redesign.
Industrial Motor Drive Snubber Circuit	UPS Inverter Output Stage
Use Scenario: Clamp diode in IGBT snubber networks for 400 V bus systems. IC Role / Device Role / Timing Role: Fast turn-off clamp to suppress voltage spikes during IGBT commutation. Use Value: 400 V V_RRM and 125 A I_FSM withstand repeated 350 V transients with margin.	Use Scenario: Output rectification in double-conversion online UPS with 380–400 V DC link. IC Role / Device Role / Timing Role: Main AC-to-DC bridge leg diode in high-reliability backup power systems. Use Value: –55°C to +150°C operating range ensures stable performance under extended thermal cycling.

AC-DC Adapter Power Supply

DC-DC Buck Converter Output Rectification

Use Scenario: Secondary-side rectification in 12–24 V, 30–60 W wall adapters with universal input.

IC Role / Device Role / Timing Role: Fast recovery rectifier replacing standard PN diodes to reduce switching losses.

Use Value: 150 ns t_rr and 1.3 V V_F improve full-load efficiency by ~1.2% versus slower alternatives.

Use Scenario: Synchronous rectification alternative in isolated 5 V/3 A buck-derived outputs.

IC Role / Device Role / Timing Role: Discrete freewheeling diode in non-synchronous buck or flyback topologies.

Use Value: DO-201AD footprint allows direct replacement of legacy rectifiers without PCB redesign.

Industrial Motor Drive Snubber Circuit

UPS Inverter Output Stage

Use Scenario: Clamp diode in IGBT snubber networks for 400 V bus systems.

IC Role / Device Role / Timing Role: Fast turn-off clamp to suppress voltage spikes during IGBT commutation.

Use Value: 400 V V_RRM and 125 A I_FSM withstand repeated 350 V transients with margin.

Use Scenario: Output rectification in double-conversion online UPS with 380–400 V DC link.

IC Role / Device Role / Timing Role: Main AC-to-DC bridge leg diode in high-reliability backup power systems.

Use Value: –55°C to +150°C operating range ensures stable performance under extended thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L04S	400 V V_RRM, 3 A I_F, 120 ns t_rr, TO-220AC package	Higher thermal mass but requires mounting hardware; not drop-in for DO-201AD board space	Prefer when higher surge robustness and heatsink attachment are needed
ON Semi MUR3040CT	400 V V_RRM, dual common-cathode configuration, 3 A per diode, TO-220AB	Provides dual-diode functionality; incompatible pinout and footprint	Select only if dual-diode topology and thermal derating margin justify layout change

Compared with STTH3L04S and MUR3040CT, the FR304G-K offers identical voltage/current ratings and competitive t_rr, but delivers immediate DO-201AD drop-in compatibility, lower assembly cost, and proven reliability in high-volume adapter and converter designs.

Availability

FR304G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and industrial power supplies requiring stable component supply and long-term manufacturing continuity.

Supply support for FR304G-K 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 global industrial, computing, and consumer markets since 1979.

The FR30xG-K series is part of TSC's fast recovery rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in compact, cost-sensitive applications such as adapters, chargers, and embedded power modules.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for FR304G-K?

The FR304G-K has a V_RRM rating of 400 V, meaning it reliably blocks up to 400 V of reverse voltage in repetitive operation. This value is fixed for the FR304G-K variant within the FR301G-K to FR307G-K family and is verified per JEDEC test standards. Exceeding this voltage risks avalanche breakdown or permanent damage to the FR304G-K.

What does the "G-K" suffix indicate in FR304G-K?

The "G" denotes green (halogen-free) molding compound compliant with IEC 61249-2-21, and "K" specifies tape-and-reel packaging (1,250 units per reel). This suffix distinguishes FR304G-K from variants like FR304G-K A0G (ammo box) and confirms RoHS and halogen-free compliance. The FR304G-K marking code on the device body is "FR304G".

Is FR304G-K pin-compatible with other DO-201AD rectifiers like 1N5408?

Yes - FR304G-K uses the standard DO-201AD axial package with anode and cathode leads arranged identically to 1N5408, UF4007, and similar devices. Physical fit and polarity (cathode band) match, enabling direct replacement. However, FR304G-K offers faster recovery (150 ns vs. >2,000 ns for 1N5408), so switching noise and efficiency will differ.

What is the reverse recovery time (t_rr) test condition for FR304G-K?

The FR304G-K t_rr of 150 ns is measured under the specific condition: forward current I_F = 0.5 A, reverse current I_R = 1.0 A, and reverse recovery current I_rr = 0.25 A, per the manufacturer's test circuit in Figure 6 of the datasheet. This differs from generic test setups and must be accounted for when comparing with diodes tested under alternate conditions.

Can FR304G-K operate at 150°C junction temperature continuously?

The FR304G-K has a maximum rated junction temperature (T_J) of +150°C, but continuous operation at this limit requires strict thermal management. At full 3 A load, its R_θJA = 35°C/W implies ≥115°C ambient rise - impractical without forced cooling. Derating curves show safe I_F drops to ~1.5 A at 100°C ambient; sustained 150°C junction operation is only permissible under pulsed or low-duty-cycle conditions.

FR304G-K Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 150 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: 30pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

FR304G-K FAQ

1.How can I place an order for FR304G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for FR304G-K 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 FR304G-K reliable?

The price and inventory of FR304G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FR304G-K is usually 5 days.

3.What payment methods are accepted for FR304G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FR304G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FR304G-K?

FR304G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FR304G-K 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 FR304G-K?

For technical support, including FR304G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FR304G-K requirements.

6.How does Aetrix verify that FR304G-K is sourced from the original manufacturer or authorized distributors?

All FR304G-K 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 FR304G-K meets industry standards.

7.What is the process for return or replacement of FR304G-K?

All FR304G-K units undergo pre-shipment inspection (PSI). If there is an issue with FR304G-K, 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 FR304G-K part is unused and in its original packaging.

Return procedure for FR304G-K:

1.Submit a request within 90 days.

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

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