FR304-AP Equivalent & Substitute Parts

Part Overview

The FR304-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The FR304-AP operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 standards.

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 @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FR304-AP is determined by strict equivalence across the following critical parameters:

Voltage Rating: All substitutes maintain 400 V DC reverse voltage (Vr) maximum
Current Rating: All substitutes maintain 3 A average rectified current (Io)
Forward Voltage: All substitutes maintain 1.3 V maximum forward voltage at 3 A
Package: All substitutes use DO-201AD axial through-hole package
Temperature Range: All substitutes operate across -55°C to 150°C junction temperature
Compliance: All substitutes are RoHS3 compliant

Substitutes are grouped into two categories:

Direct Manufacturer Substitutes maintain identical electrical characteristics and are sourced from the original manufacturer (Micro Commercial Co).

Parametric Equivalents are sourced from alternative manufacturers (Taiwan Semiconductor Corporation) and maintain all critical electrical parameters while offering variations in secondary characteristics such as reverse recovery time (trr), reverse leakage current, and junction capacitance. These variations remain within acceptable operating ranges for general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package
FR304-AP	Micro Commercial Co	Obsolete	400	3	1.3 @ 3 A	150	10 @ 400 V	65 @ 4V, 1MHz	DO-201AD
FR304GP-AP	Micro Commercial Co	Active	400	3	1.3 @ 3 A	150	5 @ 400 V	50 @ 4V, 1MHz	DO-201AD
HER305G-AP	Micro Commercial Co	Active	400	3	1.3 @ 3 A	50	10 @ 400 V	80 @ 4V, 1MHz	DO-201AD
UF5404GP-AP	Micro Commercial Co	Active	400	3	1.3 @ 3 A	50	10 @ 400 V	75 @ 4V, 1MHz	DO-201AD
FR304G A0G	Taiwan Semiconductor Corporation	Active	400	3	1.3 @ 3 A	150	5 @ 400 V	30 @ 4V, 1MHz	DO-201AD
HER305G A0G	Taiwan Semiconductor Corporation	Active	400	3	1.3 @ 3 A	50	10 @ 400 V	60 @ 4V, 1MHz	DO-201AD
SF36G A0G	Taiwan Semiconductor Corporation	Active	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	DO-201AD
SF36GHA0G	Taiwan Semiconductor Corporation	Active	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	DO-201AD

Engineering Selection Recommendations

Direct Manufacturer Substitutes (Micro Commercial Co)

FR304GP-AP is the primary direct substitute for the obsolete FR304-AP. Both parts are manufactured by Micro Commercial Co and maintain identical electrical specifications. FR304GP-AP carries active product status and is available in higher inventory quantities (720 pcs). This part is suitable for direct replacement in existing designs.

HER305G-AP and UF5404GP-AP are active alternatives from Micro Commercial Co with improved reverse recovery time (50 ns versus 150 ns), resulting in reduced switching losses. These parts are appropriate for applications where faster switching performance is beneficial.

Parametric Equivalents (Taiwan Semiconductor Corporation)

FR304G A0G maintains the same reverse recovery time (150 ns) as the original FR304-AP while offering improved reverse leakage characteristics (5 µA versus 10 µA). This part is sourced from Taiwan Semiconductor Corporation and carries REACH Unaffected status.

HER305G A0G and SF36G A0G provide faster reverse recovery times (50 ns and 35 ns respectively) compared to the original part. SF36G A0G offers the fastest recovery performance (35 ns) with reduced reverse leakage (5 µA). SF36GHA0G is an automotive-grade variant of SF36G A0G, qualified to AEC-Q101 standards, suitable for automotive applications requiring enhanced reliability qualification.

All substitute parts maintain RoHS3 compliance and operate across the full -55°C to 150°C junction temperature range. Selection between substitutes depends on application-specific requirements for switching speed, leakage current, and packaging format.

Frequently Asked Questions (FAQ)

Q: Can FR304GP-AP be used as a direct replacement for FR304-AP?

A: Yes. FR304GP-AP is manufactured by the same supplier (Micro Commercial Co) and maintains identical electrical specifications for voltage rating (400 V), current rating (3 A), forward voltage (1.3 V @ 3 A), and reverse recovery time (150 ns). Both parts use the DO-201AD axial through-hole package and operate across -55°C to 150°C. FR304GP-AP is the recommended substitute due to its active product status.

Q: What is the difference between HER305G-AP and FR304-AP?

A: HER305G-AP maintains all critical electrical parameters (400 V, 3 A, 1.3 V forward voltage) but features a faster reverse recovery time of 50 ns compared to FR304-AP's 150 ns. This faster switching characteristic reduces switching losses in rectification circuits. Both parts use the DO-201AD package and operate across the same temperature range. HER305G-AP is suitable for applications where improved switching performance is required.

Q: Are Taiwan Semiconductor Corporation parts (FR304G A0G, HER305G A0G, SF36G A0G) compatible with the original FR304-AP?

A: Yes. All Taiwan Semiconductor Corporation substitutes maintain the critical electrical parameters: 400 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage at 3 A, and DO-201AD axial through-hole package. These parts carry active product status and REACH Unaffected compliance. Differences in reverse recovery time and reverse leakage current are secondary characteristics that do not affect basic rectification functionality. Selection depends on application-specific switching speed requirements.

Q: What is the difference between SF36G A0G and SF36GHA0G?

A: SF36GHA0G is an automotive-grade variant of SF36G A0G with AEC-Q101 qualification. Both parts maintain identical electrical specifications (400 V, 3 A, 1.3 V forward voltage, 35 ns reverse recovery time). SF36GHA0G is specified for automotive applications requiring enhanced reliability qualification. Standard industrial applications use SF36G A0G.

Q: Why do some substitutes have different reverse recovery times?

A: Reverse recovery time (trr) is a secondary characteristic that varies between different diode designs and manufacturers. The FR304-AP has a trr of 150 ns, while faster alternatives such as HER305G-AP (50 ns) and SF36G A0G (35 ns) offer improved switching performance. All substitutes maintain the critical parameters of voltage rating, current rating, and forward voltage. Selection of faster recovery diodes is appropriate for high-frequency switching applications where reduced switching losses are beneficial.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance. The FR304-AP (obsolete) and all active substitutes from both Micro Commercial Co and Taiwan Semiconductor Corporation are RoHS3 compliant.

Q: What packaging formats are available for these substitutes?

A: All substitutes use the DO-201AD axial through-hole package. Packaging formats vary by supplier: FR304GP-AP, HER305G-AP, and UF5404GP-AP are supplied in Tape & Box (TB) format. FR304G A0G and SF36G A0G are supplied in Tape & Box (TB) format. HER305G A0G is supplied in Cut Tape (CT) format. SF36GHA0G packaging format is not specified. All parts are compatible with standard through-hole PCB assembly processes.

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