HER305-TP Equivalent & Substitute Parts

Part Overview

The HER305-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, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The HER305-TP features fast recovery characteristics with a 50 ns reverse recovery time, suitable for standard rectification applications requiring moderate switching speeds.

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)	50	ns
Current - Reverse Leakage @ Vr	10 @ 400 V	µA
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 HER305-TP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole
Operating Temperature Range: -55°C to 150°C minimum

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.3 V @ 3 A
Reverse Recovery Time (trr): ≤ 500 ns (fast recovery classification maintained)
Current - Reverse Leakage @ Vr: ≤ 10 µA @ 400 V
Capacitance @ Vr, F: Variation acceptable within fast recovery classification

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Electrical Performance): Parts matching all electrical parameters within specified tolerances, differing only in packaging format (tape & reel vs. cut tape) or manufacturer source.

Parametric Equivalents (Acceptable Electrical Variation): Parts meeting all mandatory parameters with minor variations in reverse recovery time, reverse leakage current, or capacitance that remain within fast recovery classification and do not degrade circuit performance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 3A (V)	trr (ns)	Ir @ 400V (µA)	Package	Status
HER305-TP	Micro Commercial Co	400	3	1.3	50	10	DO-201AD	Obsolete
HER305G-TP	Micro Commercial Co	400	3	1.3	50	10	DO-201AD	Active
FR304GP-TP	Micro Commercial Co	400	3	1.3	150	5	DO-201AD	Active
UF5404GP-TP	Micro Commercial Co	400	3	1.3	50	10	DO-201AD	Active
GP30G-E3/54	Vishay General Semiconductor	400	3	1.1	5000	5	DO-201AD	Active
FR304G	Taiwan Semiconductor Corporation	400	3	1.3	150	5	DO-201AD	Active
HER305G	Taiwan Semiconductor Corporation	400	3	1.3	50	10	DO-201AD	Active
HER305G A0G	Taiwan Semiconductor Corporation	400	3	1.3	50	10	DO-201AD	Active
PG304R_R2_00001	Panjit International Inc.	400	3	1.3	150	1	DO-201AD	Active
SF36G	Taiwan Semiconductor Corporation	400	3	1.3	35	5	DO-201AD	Active
SF36G A0G	Taiwan Semiconductor Corporation	400	3	1.3	35	5	DO-201AD	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

HER305G-TP, HER305G, and HER305G A0G are direct electrical equivalents to the HER305-TP. These parts maintain identical voltage, current, forward voltage, and reverse recovery time specifications. HER305G-TP is available in tape & reel packaging; HER305G and HER305G A0G are available in cut tape and cut tape formats respectively. All three are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Selection among these three depends on packaging requirements and supplier availability.

Secondary Substitutes (Acceptable Parametric Variation):

UF5404GP-TP matches the HER305-TP across all critical parameters including reverse recovery time (50 ns) and reverse leakage current (10 µA). This part is manufactured by Micro Commercial Co and available in tape & reel format with active product status.

SF36G and SF36G A0G offer improved reverse recovery time (35 ns) compared to the HER305-TP (50 ns), resulting in faster switching characteristics. Reverse leakage current is reduced to 5 µA. These parts are suitable for applications where faster recovery is beneficial. SF36G is available in cut tape; SF36G A0G is available in tape & box format.

FR304G and FR304GP-TP feature extended reverse recovery time (150 ns) and reduced reverse leakage current (5 µA). These parts are appropriate for applications where slower recovery is acceptable or preferred. FR304G is available in cut tape; FR304GP-TP is available in tape & reel format.

Alternative Substitute (Different Recovery Classification):

GP30G-E3/54 manufactured by Vishay General Semiconductor is classified as standard recovery (5 µs reverse recovery time) rather than fast recovery. This part features lower forward voltage (1.1 V @ 3 A) and reduced reverse leakage current (5 µA). Selection of this part requires confirmation that standard recovery characteristics are compatible with the application circuit, as switching speed performance differs significantly from the HER305-TP.

Compliance and Availability:

All recommended substitutes are ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity rating. All parts are available in active product status except the original HER305-TP. Inventory levels range from 712 to 3688 pieces across substitute options, providing procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can HER305G-TP be used as a direct replacement for HER305-TP?

A: Yes. HER305G-TP is a direct electrical equivalent with identical voltage (400 V), current (3 A), forward voltage (1.3 V @ 3 A), and reverse recovery time (50 ns) specifications. The primary difference is packaging format: HER305G-TP is supplied in tape & reel format while HER305-TP was supplied in bulk. Both use the same DO-201AD axial through-hole package.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Reverse recovery time (trr) defines the classification. Fast recovery diodes have trr ≤ 500 ns and are suitable for switching applications requiring rapid diode turn-off. Standard recovery diodes have trr > 500 ns (typically several microseconds) and are used in lower-frequency rectification where switching speed is not critical. The HER305-TP is fast recovery (50 ns). The GP30G-E3/54 is standard recovery (5000 ns) and should only be substituted if the application circuit can tolerate this performance difference.

Q: Are SF36G and HER305G interchangeable?

A: SF36G and HER305G are parametric equivalents with identical voltage, current, and forward voltage ratings. The key difference is reverse recovery time: SF36G has 35 ns while HER305G has 50 ns. SF36G offers faster switching performance. Both are suitable for the same applications; SF36G provides improved performance margin in switching circuits.

Q: What does the packaging designation mean (tape & reel vs. cut tape)?

A: Tape & reel (TR) and cut tape (CT) refer to supply format only, not electrical performance. Tape & reel format supplies components on continuous tape wound on reels, suitable for automated assembly. Cut tape supplies components on tape segments, suitable for manual assembly or smaller production runs. The DO-201AD package and electrical specifications remain identical regardless of supply format.

Q: Can I substitute PG304R_R2_00001 for HER305-TP?

A: Yes, with consideration of reverse leakage current. PG304R_R2_00001 meets all mandatory parameters (400 V, 3 A, DO-201AD, through-hole) and maintains fast recovery classification. However, reverse leakage current is significantly lower (1 µA vs. 10 µA), and reverse recovery time is extended (150 ns vs. 50 ns). These differences are acceptable for most rectification applications and may provide performance benefits in low-leakage or lower-frequency circuits.

Q: Is RoHS3 compliance important for my application?

A: RoHS3 compliance is a regulatory requirement in many markets and is mandatory for products sold in the European Union and many other regions. All recommended substitutes are ROHS3 compliant, matching the compliance status of the original HER305-TP. Verify your application's regulatory requirements to confirm RoHS3 compliance is necessary.

Q: What is MSL (Moisture Sensitivity Level) and why is it MSL 1?

A: MSL indicates the component's sensitivity to moisture absorption during storage and handling. MSL 1 (unlimited) means the component has no moisture sensitivity restrictions and can be stored indefinitely without special drying procedures before soldering. All recommended substitutes carry MSL 1 rating, eliminating moisture management concerns during assembly.

Q: Should I choose the substitute with the lowest reverse recovery time?

A: Not necessarily. Lower reverse recovery time (faster switching) is beneficial in high-frequency switching applications but provides no advantage in standard rectification circuits. SF36G (35 ns) offers faster recovery than HER305-TP (50 ns), but this improvement is only valuable if your circuit operates at frequencies where switching speed is a limiting factor. For most applications, HER305G or UF5404GP-TP provide equivalent performance at lower cost.

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