Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Taiwan Semiconductor Corporation FR306G-K

Name: FR306G-K
Brand: Taiwan Semiconductor Corporation
SKU: FR306G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: FR306G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: FR306G-K.pdf

Description:: 500NS, 3A, 800V, FAST RECOVERY R

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,864

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

FR306G-K from Taiwan Semiconductor is a 3A, 800V fast recovery rectifier diode in DO-201AD package, featuring 500 ns reverse recovery time, 1.3 V forward voltage at 3 A, and 125 A surge current capability. It serves as the primary output rectifier in high-frequency switching power supplies for industrial DC-DC converters.

For engineers reviewing the FR306G-K datasheet, FR306G-K pinout, FR306G-K application, or FR306G-K equivalent, key selection criteria include rated V_RRM (800 V), I_F (3 A), t_rr (500 ns), thermal resistance (35 °C/W), and DO-201AD mechanical compatibility with automated through-hole assembly.

Technical Context

This single-die, axial-leaded fast recovery rectifier operates with junction temperatures from –55 °C to +150 °C and supports repetitive peak reverse voltages up to 800 V. Its 500 ns reverse recovery time enables efficient operation in 20–100 kHz switching topologies without excessive switching loss.

The device exhibits low forward voltage (≤1.3 V at 3 A, 25 °C) and minimal leakage (≤5 µA at 25 °C, ≤100 µA at 125 °C), supporting high-efficiency power conversion in constrained thermal environments where R_θJA = 35 °C/W is critical for passive heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - Withstands peak reverse voltage in 800 V-rated SMPS output stages without breakdown
I_F	3 A continuous - Supports sustained DC output current in mid-power adapters and auxiliary rails
t_rr	500 ns - Enables stable operation in 50–100 kHz flyback and forward converters with low switching loss
V_F	≤1.3 V @ 3 A, 25 °C - Reduces conduction loss and improves efficiency vs. standard recovery diodes
R_θJA	35 °C/W - Allows direct PCB-mount thermal management without forced air or heatsinks in ambient ≤70 °C
I_FSM	125 A @ 8.3 ms - Survives cold-start inrush and transient overloads in industrial power supplies

Pinout & Package

Package: DO-201AD - Axial-leaded, molded plastic case meeting UL 94V-0; cathode indicated by band; pure tin-plated leads compliant with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to transformer secondary or switch node; must handle full 3 A RMS and 125 A surge
Cathode (Lead 2, banded end)	Output current exit point	Connects to output filter capacitor; polarity marking ensures correct orientation in high-voltage DC bus

Key Features

Feature	Design Value
Fast recovery (500 ns)	Minimizes reverse recovery charge (Q_rr) in high-frequency SMPS, reducing EMI and MOSFET stress
Low V_F (≤1.3 V)	Lowers conduction loss by ~15% vs. comparable 800 V standard recovery diodes, improving thermal margin
DO-201AD mechanical standardization	Enables drop-in replacement across FR30xG-K series and broad industry-compatible board layouts
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and global environmental regulations for industrial and telecom equipment

Applications

DC-DC Converter Output Rectification	Switching Inverter Freewheeling Path
Use Scenario: Secondary-side rectification in isolated 24–48 V input, 5–24 V output DC-DC modules for PLCs and motor drives. IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer demagnetization phase; replaces slower 1N5408-class diodes. Use Value: 500 ns t_rr prevents cross-conduction loss and reduces snubber requirements versus 2 µs standard diodes.	Use Scenario: Freewheeling path in H-bridge inverters driving 100–500 W AC induction motors in HVAC blowers. IC Role / Device Role / Timing Role: Provides low-loss return path for inductive kickback during PWM dead-time intervals. Use Value: 125 A I_FSM withstands motor stall currents; 800 V V_RRM accommodates 400 V DC bus with safety margin.
Industrial Power Supply Input Stage	AC-DC Adapter Auxiliary Rail
Use Scenario: Input bridge rectification in 100–200 W industrial open-frame PSUs with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: High-surge rectifier handling line transients and cold-start surges in full-wave bridge configuration. Use Value: 125 A I_FSM exceeds IEC 61000-4-5 surge test requirements; DO-201AD lead form supports wave-soldering.	Use Scenario: Auxiliary +12 V or +15 V rail rectification in multi-output laptop adapters and PoE injectors. IC Role / Device Role / Timing Role: Secondary-side fast recovery diode delivering low-noise, low-loss bias supply for control ICs and gate drivers. Use Value: ≤5 µA I_R at 25 °C ensures minimal standby power loss; 35 °C/W R_θJA maintains <85 °C junction temp at 1.5 A load.

DC-DC Converter Output Rectification

Switching Inverter Freewheeling Path

Use Scenario: Secondary-side rectification in isolated 24–48 V input, 5–24 V output DC-DC modules for PLCs and motor drives.

IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer demagnetization phase; replaces slower 1N5408-class diodes.

Use Value: 500 ns t_rr prevents cross-conduction loss and reduces snubber requirements versus 2 µs standard diodes.

Use Scenario: Freewheeling path in H-bridge inverters driving 100–500 W AC induction motors in HVAC blowers.

IC Role / Device Role / Timing Role: Provides low-loss return path for inductive kickback during PWM dead-time intervals.

Use Value: 125 A I_FSM withstands motor stall currents; 800 V V_RRM accommodates 400 V DC bus with safety margin.

Industrial Power Supply Input Stage

AC-DC Adapter Auxiliary Rail

Use Scenario: Input bridge rectification in 100–200 W industrial open-frame PSUs with universal AC input (85–265 VAC).

IC Role / Device Role / Timing Role: High-surge rectifier handling line transients and cold-start surges in full-wave bridge configuration.

Use Value: 125 A I_FSM exceeds IEC 61000-4-5 surge test requirements; DO-201AD lead form supports wave-soldering.

Use Scenario: Auxiliary +12 V or +15 V rail rectification in multi-output laptop adapters and PoE injectors.

IC Role / Device Role / Timing Role: Secondary-side fast recovery diode delivering low-noise, low-loss bias supply for control ICs and gate drivers.

Use Value: ≤5 µA I_R at 25 °C ensures minimal standby power loss; 35 °C/W R_θJA maintains <85 °C junction temp at 1.5 A load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3R08	Same 3 A / 800 V rating; t_rr = 45 ns (faster); VF = 1.75 V (higher); TO-220AC package	Requires heatsink mounting and PCB layout change; suited for higher-frequency, higher-power designs	Select when t_rr < 100 ns is mandatory and thermal design allows TO-220 footprint
ES3J	3 A / 600 V; t_rr = 35 ns; SMC package; VF = 1.7 V; lower V_RRM and different thermal profile	Not suitable for 800 V systems; requires re-routed traces and requalified thermal relief	Consider only for 600 V-rated designs where ultra-fast recovery outweighs voltage derating needs

Compared with STTH3R08 and ES3J, FR306G-K offers optimal balance of 800 V rating, 500 ns recovery, and DO-201AD through-hole compatibility-enabling cost-effective, thermally adequate rectification in established industrial power supply platforms without layout revision.

Availability

FR306G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial AC-DC power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for FR306G-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 industrial, computing, and consumer markets since 1979.

The FR30xG-K series is part of TSC's high-reliability fast recovery rectifier product line, engineered specifically for robust performance in high-volume, thermally demanding switching power supplies and motor control systems.

FAQ

What is the maximum junction temperature rating for FR306G-K?

The FR306G-K has a maximum junction temperature (T_J) of +150 °C and a minimum of –55 °C. This wide operating range allows reliable use in industrial environments with elevated ambient temperatures. The device's 35 °C/W junction-to-ambient thermal resistance means proper PCB copper area and airflow must be maintained to keep the FR306G-K within this limit under full 3 A load.

Does FR306G-K have a specified reverse recovery charge (Q_rr) value?

The FR306G-K datasheet does not publish Q_rr directly, but its 500 ns reverse recovery time (t_rr) at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A provides an indirect measure of stored charge. For precise Q_rr-based loss modeling in high-frequency designs, engineers should consult TSC's application note AN-FR30xG-K or characterize the FR306G-K in-circuit using standard double-pulse test methods.

Is FR306G-K compatible with lead-free reflow or wave soldering processes?

Yes, FR306G-K features pure tin-plated leads qualified per J-STD-002 for solderability and meets JEDEC JESD201 Class 1A whisker resistance. Its DO-201AD package is rated for standard lead-free wave soldering profiles (peak 260 °C, 10 s max) and compatible with selective reflow for mixed-technology boards-no special pre-bake or moisture sensitivity handling is required.

How does FR306G-K differ from FR305G-K and FR307G-K in terms of electrical ratings?

FR306G-K is rated for 800 V V_RRM, positioned between FR305G-K (600 V) and FR307G-K (1000 V). All three share identical I_F = 3 A, I_FSM = 125 A, and t_rr = 500 ns. The key distinction is reverse voltage capability: selecting FR306G-K ensures 20% voltage margin over 600–700 V DC bus systems while avoiding over-specification and cost premium of the 1000 V FR307G-K.

Can FR306G-K be used in place of a Schottky diode in a 24 V output converter?

No-FR306G-K is a silicon PN junction fast recovery rectifier, not a Schottky. Its 1.3 V forward voltage is significantly higher than typical Schottky diodes (0.4–0.6 V), resulting in greater conduction loss at low output voltages. For 24 V and below outputs, a Schottky or SiC diode is preferred. FR306G-K is best applied in ≥48 V output or high-V_RRM scenarios where its 800 V rating and surge robustness outweigh V_F penalty.

FR306G-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):: 800 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):: 500 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 800 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

FR306G-K FAQ

1.How can I place an order for FR306G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for FR306G-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 FR306G-K reliable?

The price and inventory of FR306G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FR306G-K is usually 5 days.

3.What payment methods are accepted for FR306G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FR306G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FR306G-K?

FR306G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FR306G-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 FR306G-K?

For technical support, including FR306G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FR306G-K requirements.

6.How does Aetrix verify that FR306G-K is sourced from the original manufacturer or authorized distributors?

All FR306G-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 FR306G-K meets industry standards.

7.What is the process for return or replacement of FR306G-K?

All FR306G-K units undergo pre-shipment inspection (PSI). If there is an issue with FR306G-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 FR306G-K part is unused and in its original packaging.

Return procedure for FR306G-K:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…