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

Diodes Incorporated FR604-T

Name: FR604-T
Brand: Diodes Incorporated
SKU: FR604-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FR604-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: R-6, Axial

Datasheet:: FR604-T.pdf

Description:: DIODE GEN PURP 400V 6A R-6

Quantity:: RFQ Add To RFQ list

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Inventory:7,916

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Product details

Overview

FR604-T from Diodes Incorporated is a 400 V, 6.0 A fast recovery axial-lead rectifier diode in R-6 molded plastic package (UL 94V-0), featuring 150 ns reverse recovery time, 1.3 V forward voltage at 6.0 A DC, and 300 A surge capability - used in offline AC/DC input stage rectification for industrial power supplies.

For engineers reviewing the FR604-T datasheet, FR604-T pinout, FR604-T application, or FR604-T equivalent, key selection criteria include peak repetitive reverse voltage (400 V), average forward current rating (6.0 A @ 75 °C), reverse recovery time (150 ns), forward voltage drop (1.3 V), and thermal derating behavior per Fig. 1.

Technical Context

This device operates as a unidirectional silicon junction rectifier with fast recovery characteristics optimized for switching-mode power supply (SMPS) input stages and high-frequency flyback converters. Its 150 ns t_rr enables reduced switching losses compared to standard recovery diodes under 60–100 kHz operation.

The R-6 axial package supports through-hole mounting in high-reliability industrial environments, with 1.7 g mass, -65 °C to +175 °C operating range, and color-band cathode polarity marking. Thermal performance is defined by 9.5 mm lead length at T_L = 55 °C for I_(AV) derating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive peak reverse voltage; defines safe blocking capability in AC line rectification.
I_(AV)	6.0 A @ T_A = 75 °C - Continuous average forward current rating; determines heatsink sizing in open-frame designs.
t_rr	150 ns - Measured at I_F = 0.5 A, I_R = 1.0 A, I_RR = 0.25 A; enables efficient operation up to ~100 kHz switching.
V_F	1.3 V @ 6.0 A DC - Forward voltage drop directly impacts conduction loss and thermal rise in primary-side rectifiers.
I_FSM	300 A - Non-repetitive surge rating (8.3 ms half-sine); withstands inrush currents during cold-start of AC/DC converters.
T_J/T_STG	-65 °C to +175 °C - Wide junction temperature range supports operation in harsh ambient conditions without derating.

Pinout & Package

R-6 molded plastic axial-leaded package (UL 94V-0), with cathode identified by color band on body. Leads are solderable per MIL-STD-202 Method 208. Dimensions: A = 25.4 mm (length), B/D = 8.6–9.1 mm (diameter), C = 1.2–1.3 mm (lead diameter).

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked lead)	Positive input terminal	Connects to AC source or transformer secondary; carries full forward current during conduction half-cycle.
Cathode (band-marked lead)	Negative output terminal	Connects to bulk capacitor or downstream circuit; polarity marking prevents reverse installation in PCB layout.

Key Features

Feature	Design Value
Fast recovery time	150 ns - Reduces reverse recovery charge (Q_rr) and associated switching losses in SMPS input rectifiers.
Low forward voltage	1.3 V @ 6.0 A - Minimizes conduction loss and improves efficiency in high-current AC/DC front-end stages.
High surge capability	300 A (8.3 ms) - Handles repeated cold-start surges without degradation in industrial power supplies.
Wide temperature range	-65 °C to +175 °C - Supports operation in extended-temperature environments such as motor drives and outdoor power systems.

Applications

Industrial AC/DC Power Supplies

UPS Input Rectification

Use Scenario: Full-wave bridge rectification in 1–3 kW offline switch-mode power supplies for PLCs and HMIs.

IC Role / Device Role / Timing Role: Primary-side unidirectional current steering element converting 230 VAC to pulsating DC before bulk capacitance.

Use Value: 150 ns t_rr limits switching loss during zero-crossing transitions, improving overall efficiency by ~0.8% vs. standard recovery diodes.

Use Scenario: Input rectifier in double-conversion UPS systems requiring high reliability and thermal stability.

IC Role / Device Role / Timing Role: High-current, high-voltage rectifying diode in three-phase or single-phase input stage.

Use Value: 6.0 A average current rating and -65 °C to +175 °C range ensure stable operation across wide ambient and load transients.

Solar Microinverter Front-End

Motor Drive DC Link Protection

Use Scenario: AC input rectification in grid-tied solar microinverters with high-frequency transformer isolation.

IC Role / Device Role / Timing Role: Fast-recovery rectifier handling 50/60 Hz input with minimal reverse recovery noise coupling into control circuitry.

Use Value: Low 10 µA reverse leakage at 25 °C and 150 ns t_rr reduce EMI generation and improve MPPT accuracy.

Use Scenario: Freewheeling and protection path in IGBT-based variable frequency drives feeding induction motors.

IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback energy during IGBT turn-off.

Use Value: 300 A non-repetitive surge rating safely absorbs motor winding energy spikes without failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PR6004	Same V_RRM (400 V), I_(AV) (6.0 A), and t_rr (150 ns); improved thermal resistance and RoHS-compliant packaging.	Direct replacement in new designs; preferred for production due to updated qualification and lifecycle status.	Select PR6004 for new designs - it supersedes FR604-T and offers identical electrical performance with enhanced manufacturability.
ES1J	Lower I_(AV) (1.0 A), smaller DO-41 package, t_rr = 35 ns - not rated for 6 A continuous operation.	Only suitable for low-power signal or auxiliary supply rectification, not main power path replacement.	Not recommended as functional substitute - insufficient current rating and thermal capacity for FR604-T's intended use cases.

Compared with PR6004, FR604-T shares identical core ratings but lacks updated environmental compliance and long-term availability assurance; ES1J fails to meet current and voltage requirements, making it unsuitable for direct substitution in high-power rectification roles.

Availability

FR604-T is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, UPS input stages, and solar microinverter front-end rectification requiring stable component supply and proven thermal robustness.

Supply support for FR604-T 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management and signal integrity solutions for industrial, automotive, and computing markets.

The FR60x series belongs to Diodes' legacy fast recovery rectifier product line, designed specifically for cost-sensitive, high-volume AC/DC front-end rectification where thermal margin and surge resilience are critical.

FAQ

What is the maximum junction temperature for FR604-T?

The FR604-T has a maximum junction temperature (T_J) of +175 °C and minimum storage temperature of -65 °C. This rating allows operation in high-ambient environments such as enclosed industrial enclosures or motor drive cabinets without additional forced cooling, provided thermal design accounts for 6.0 A derating above 75 °C ambient.

Is FR604-T RoHS compliant?

FR604-T meets RoHS Directive 2011/65/EU requirements as documented in Diodes Incorporated's official compliance statements. Lead finish is matte tin over copper, and the R-6 package contains no restricted substances above threshold limits. However, Diodes recommends PR6004 for new designs due to its fully qualified RoHS+REACH status and extended lifecycle support.

Can FR604-T replace FR603 or FR605 in a design?

No - FR604-T is rated for 400 V V_RRM, while FR603 is 200 V and FR605 is 600 V. Substitution requires verification of peak reverse voltage stress in the circuit. Exceeding V_RRM risks avalanche breakdown; using a lower-rated part (e.g., FR603) may cause catastrophic failure under 400 V transient conditions.

What is the typical reverse recovery charge (Q_rr) of FR604-T?

Q_rr is not explicitly specified in the DS26004 datasheet for FR604-T. It can be estimated from t_rr = 150 ns and di/dt conditions (I_F = 0.5 A, I_R = 1.0 A, I_RR = 0.25 A), yielding Q_rr ≈ 22.5 nC. For precise values, Diodes' application note AP02011 provides measurement methodology and comparative Q_rr data across the FR60x family.

FR604-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: R-6, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 6A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 6 A

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

Reverse Recovery Time (trr):: 150 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: R-6

Operating Temperature - Junction:: -65°C ~ 175°C

FR604-T FAQ

1.How can I place an order for FR604-T through Aetrix?

Please submit a Request for Quotation (RFQ) for FR604-T 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 FR604-T reliable?

The price and inventory of FR604-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FR604-T is usually 5 days.

3.What payment methods are accepted for FR604-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FR604-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FR604-T?

FR604-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FR604-T 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 FR604-T?

For technical support, including FR604-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FR604-T requirements.

6.How does Aetrix verify that FR604-T is sourced from the original manufacturer or authorized distributors?

All FR604-T 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 FR604-T meets industry standards.

7.What is the process for return or replacement of FR604-T?

All FR604-T units undergo pre-shipment inspection (PSI). If there is an issue with FR604-T, 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 FR604-T part is unused and in its original packaging.

Return procedure for FR604-T:

1.Submit a request within 90 days.

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

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