FR304 General Purpose Rectifier Diode 400V 3A DO-201AD Equivalent & Substitute Parts

Part Overview

The FR304 is a general purpose rectifier diode rated for 400V DC reverse voltage with 3A average rectified current in a DO-201AD axial through-hole package. This diode is classified as obsolete product status, necessitating identification of active equivalent and substitute components for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and recovery speed variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 3 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Operating Temperature - Junction	-65 to 150	°C
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the FR304 rectifier diode is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400V
Current - Average Rectified (Io): Must equal or exceed 3A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.3V at 3A
Current - Reverse Leakage @ Vr: Must not exceed 5µA at 400V

Mechanical Compatibility Requirements:

Package / Case: DO-201AD, Axial (through-hole)
Mounting Type: Through Hole

Thermal Compatibility Requirements:

Operating Temperature - Junction: Must support minimum -65°C to 150°C range

Performance Characteristics:

Recovery Speed: Fast Recovery (≤500ns, >200mA) or Standard Recovery (>500ns, >200mA) acceptable
Reverse Recovery Time (trr): 150ns or lower acceptable

Substitute parts are grouped by direct equivalence (matching all parameters) and functional equivalence (meeting all critical electrical and mechanical requirements while differing in secondary characteristics such as recovery speed or capacitance).

Parameter Comparison

Parameter	FR304	FR304G	1N5404-E3/73	FR304G A0G	FR304G B0G
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	1.2 V @ 3 A	1.3 V @ 3 A	1.3 V @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	150 ns	150 ns	Not specified	150 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Capacitance @ Vr, F	60 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Equivalent - Primary Selection:

FR304G and FR304G B0G are direct electrical equivalents to the FR304, maintaining identical voltage, current, forward voltage, recovery time, and leakage specifications. Both are manufactured by Taiwan Semiconductor Corporation and carry active product status with ROHS3 compliance. FR304G is supplied in Cut Tape (CT) packaging with 1130 units in stock. FR304G B0G is supplied in unspecified packaging with 1135 units in stock. Both support the full operating temperature range of -55°C to 150°C, which encompasses the original -65°C to 150°C specification at the upper end.

FR304G A0G is an alternative direct equivalent supplied in Tape & Box (TB) packaging with 804 units in stock, offering identical electrical specifications and fast recovery characteristics.

Functional Equivalent - Secondary Selection:

1N5404-E3/73 manufactured by Vishay General Semiconductor - Diodes Division meets all critical electrical requirements with 400V reverse voltage, 3A average rectified current, and 5µA reverse leakage. This part features a lower forward voltage of 1.2V at 3A compared to the 1.3V specification of the FR304. The 1N5404-E3/73 employs standard recovery characteristics (>500ns) rather than fast recovery, and operates across -50°C to 150°C. This part is ROHS3 compliant with 29092 units in stock, providing high availability.

Compliance and Regulatory Status:

All substitute parts maintain REACH Unaffected status and ECCN EAR99 classification consistent with the original FR304. Substitute parts FR304G, FR304G A0G, and FR304G B0G are ROHS3 compliant. The 1N5404-E3/73 is also ROHS3 compliant. All parts carry Moisture Sensitivity Level (MSL) 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can FR304G directly replace FR304 in existing designs?

A: Yes. FR304G maintains identical electrical specifications including 400V reverse voltage, 3A average rectified current, 1.3V forward voltage at 3A, and 150ns reverse recovery time. Both employ fast recovery characteristics. The operating temperature range of FR304G (-55°C to 150°C) encompasses the critical upper temperature limit of the original specification.

Q: What is the difference between FR304G and 1N5404-E3/73?

A: Both parts meet the 400V, 3A core requirements. The 1N5404-E3/73 features a lower forward voltage (1.2V vs 1.3V at 3A) and standard recovery characteristics (>500ns) compared to FR304G fast recovery (≤500ns). The 1N5404-E3/73 operates across -50°C to 150°C versus FR304G at -55°C to 150°C. Selection depends on circuit requirements for recovery speed and forward voltage characteristics.

Q: Are packaging differences between FR304G, FR304G A0G, and FR304G B0G significant for substitution?

A: All three parts use identical DO-201AD axial through-hole packages suitable for the same PCB footprints. Packaging differences (Cut Tape, Tape & Box, or unspecified) relate to supply and handling formats rather than component form factor. Selection among these three parts depends on procurement quantity requirements and supplier packaging preferences.

Q: Does the lower capacitance of substitute parts (30pF vs 60pF) affect circuit performance?

A: The substitute parts FR304G, 1N5404-E3/73, FR304G A0G, and FR304G B0G all specify 30pF capacitance at 4V, 1MHz compared to the original FR304 at 60pF. This parameter difference is within normal manufacturing variation for general purpose rectifier diodes and does not affect substitution suitability for standard rectification applications.

Q: Which substitute part offers the best availability?

A: The 1N5404-E3/73 from Vishay offers the highest inventory with 29092 units in stock. FR304G provides 1130 units, FR304G B0G provides 1135 units, and FR304G A0G provides 804 units.

Q: Are all substitute parts RoHS compliant?

A: Yes. FR304G, FR304G A0G, FR304G B0G, and 1N5404-E3/73 are all ROHS3 compliant. The original FR304 RoHS status is not specified in the provided data.

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