FR304-TP Equivalent & Substitute Parts

Part Overview

The FR304-TP 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, which necessitates identification of active equivalent and substitute components for ongoing design and procurement requirements. The FR304-TP operates across a junction temperature range of -55°C to 150°C and complies with ROHS3 standards. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

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

Substitute Part Grouping Explanation

Substitution of the FR304-TP is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 3 A
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Secondary Parameters Affecting Substitution:

Reverse Recovery Time (trr): Ranges from 35 ns to 150 ns across substitutes
Current - Reverse Leakage @ Vr: Ranges from 1 µA to 10 µA @ 400 V
Capacitance @ Vr, F: Ranges from 30 pF to 80 pF @ 4V, 1MHz

All identified substitute parts meet the critical matching parameters. Variations in reverse recovery time and reverse leakage current represent performance enhancements or alternative characteristics within the fast recovery diode classification. Packaging formats differ (Cut Tape, Tape & Reel, Tape & Box) but all maintain the DO-201AD through-hole form factor.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Status
FR304-TP	Micro Commercial Co	400	3	1.3 @ 3 A	150	10 @ 400 V	65 @ 4V, 1MHz	DO-201AD	Obsolete
FR304GP-TP	Micro Commercial Co	400	3	1.3 @ 3 A	150	5 @ 400 V	50 @ 4V, 1MHz	DO-201AD	Active
HER305G-TP	Micro Commercial Co	400	3	1.3 @ 3 A	50	10 @ 400 V	80 @ 4V, 1MHz	DO-201AD	Active
UF5404GP-TP	Micro Commercial Co	400	3	1.3 @ 3 A	50	10 @ 400 V	75 @ 4V, 1MHz	DO-201AD	Active
FR304G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	150	5 @ 400 V	30 @ 4V, 1MHz	DO-201AD	Active
HER305G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	60 @ 4V, 1MHz	DO-201AD	Active
HER305G A0G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	60 @ 4V, 1MHz	DO-201AD	Active
PG304R_R2_00001	Panjit International Inc.	400	3	1.3 @ 3 A	150	1 @ 400 V	60 @ 4V, 1MHz	DO-201AD	Active
SF36G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	DO-201AD	Active
SF36G A0G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	DO-201AD	Active
SF36GH	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	DO-201AD	Active

Engineering Selection Recommendations

Direct Replacement (Same Manufacturer): FR304GP-TP is the primary active equivalent from Micro Commercial Co. It maintains identical voltage and current ratings with improved reverse leakage characteristics (5 µA versus 10 µA) and is available in Tape & Reel packaging. Product status is active with ROHS3 compliance and MSL rating of 1 (Unlimited).

Parametric Equivalents with Enhanced Performance: HER305G-TP, UF5404GP-TP, HER305G, and HER305G A0G offer reduced reverse recovery time (50 ns versus 150 ns), resulting in faster switching characteristics. These parts are suitable for applications where switching speed is a design consideration. All maintain active product status and ROHS3 compliance.

Ultra-Fast Recovery Alternative: SF36G, SF36G A0G, and SF36GH provide the fastest reverse recovery time (35 ns) among available substitutes. SF36GH carries automotive-grade qualification (AEC-Q101) and is suitable for automotive applications. All three variants are active and ROHS3 compliant.

Alternative Manufacturer Options: FR304G (Taiwan Semiconductor Corporation) and PG304R_R2_00001 (Panjit International Inc.) provide equivalent electrical performance with active product status. PG304R_R2_00001 exhibits superior reverse leakage characteristics (1 µA @ 400 V).

Packaging Considerations: Substitute parts are available in Cut Tape (CT), Tape & Reel (TR), and Tape & Box (TB) formats. All maintain the DO-201AD through-hole package form factor for direct mechanical compatibility. Selection should align with procurement and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can FR304GP-TP be used as a direct replacement for FR304-TP? A: Yes. FR304GP-TP is manufactured by the same supplier (Micro Commercial Co) and maintains identical voltage (400 V), current (3 A), and forward voltage (1.3 V @ 3 A) specifications. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). Reverse leakage is improved at 5 µA versus 10 µA.

Q: What is the difference between HER305G and HER305G A0G? A: Both parts are manufactured by Taiwan Semiconductor Corporation and share identical electrical specifications: 400 V reverse voltage, 3 A current rating, 50 ns reverse recovery time, and 60 pF capacitance. The designation suffix (A0G) indicates a packaging or qualification variant. Both are active and ROHS3 compliant.

Q: Why do some substitutes have faster reverse recovery times? A: Reverse recovery time (trr) varies based on diode design and manufacturing process. SF36G, SF36G A0G, and SF36GH achieve 35 ns recovery time compared to the original FR304-TP specification of 150 ns. Faster recovery reduces switching losses in high-frequency applications but does not affect the core voltage and current ratings.

Q: Is SF36GH suitable for automotive applications? A: Yes. SF36GH carries automotive-grade qualification (AEC-Q101) and is rated for automotive use. It maintains the same electrical specifications as SF36G and SF36G A0G (400 V, 3 A, 35 ns recovery time) with active product status and ROHS3 compliance.

Q: What packaging formats are available for substitutes? A: Substitute parts are supplied in three formats: Cut Tape (CT), Tape & Reel (TR), and Tape & Box (TB). All maintain the DO-201AD through-hole axial package form factor. Selection depends on procurement volume and assembly equipment compatibility.

Q: Does reverse leakage current affect circuit performance? A: Reverse leakage current (Ir) ranges from 1 µA to 10 µA across available substitutes. In most general-purpose rectifier applications, this variation has negligible impact. PG304R_R2_00001 offers the lowest leakage at 1 µA if leakage-sensitive applications require this specification.

Q: Are all substitutes ROHS3 compliant? A: Yes. All identified substitute parts carry ROHS3 compliance certification. MSL (Moisture Sensitivity Level) ratings are 1 (Unlimited) for all active substitutes, indicating no moisture sensitivity restrictions during storage and handling.

Q: Can I use HER305G-TP in place of FR304-TP in existing designs? A: Yes. HER305G-TP meets all critical electrical parameters (400 V, 3 A, 1.3 V forward voltage) and maintains the DO-201AD through-hole package. The reduced reverse recovery time (50 ns versus 150 ns) represents improved performance and does not create compatibility issues in standard rectifier applications.

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