HER305-AP Equivalent & Substitute Parts

Part Overview

The HER305-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 HER305-AP 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 µA @ 400 V	µA
Capacitance @ Vr, F	80 @ 4V, 1MHz	pF
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HER305-AP are grouped based on electrical parameter compatibility within the 400 V / 3 A rectifier diode category. All substitute parts maintain the same voltage rating (400 V DC reverse), current rating (3 A average rectified), forward voltage characteristic (1.3 V @ 3 A), and through-hole DO-201AD package configuration. Substitution eligibility is determined by the following key 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

Substitute parts are classified into two categories: direct equivalents (identical electrical and physical specifications) and parametric equivalents (meeting core electrical requirements with minor variations in secondary parameters such as reverse recovery time, reverse leakage current, or junction capacitance).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Cj @ Vr [pF]	Product Status	Packaging
HER305-AP	Micro Commercial Co	400	3	1.3 @ 3 A	50	10 @ 400 V	80 @ 4V, 1MHz	Obsolete	—
HER305G-AP	Micro Commercial Co	400	3	1.3 @ 3 A	50	10 @ 400 V	80 @ 4V, 1MHz	Active	Tape & Box (TB)
UF5404GP-AP	Micro Commercial Co	400	3	1.3 @ 3 A	50	10 @ 400 V	75 @ 4V, 1MHz	Active	Tape & Box (TB)
FR304GP-AP	Micro Commercial Co	400	3	1.3 @ 3 A	150	5 @ 400 V	50 @ 4V, 1MHz	Active	—
HER305G A0G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	60 @ 4V, 1MHz	Active	Cut Tape (CT)
FR304G A0G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	150	5 @ 400 V	30 @ 4V, 1MHz	Active	Tape & Box (TB)
SF36G A0G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	Active	Tape & Box (TB)
SF36GHA0G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	5 @ 400 V	60 @ 4V, 1MHz	Active	—

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

HER305G-AP is the direct equivalent to HER305-AP, manufactured by Micro Commercial Co with identical electrical specifications and active product status. This part is available in Tape & Box packaging with 1120 units in stock, providing immediate procurement availability. Selection of HER305G-AP eliminates any parametric variation and maintains design compatibility without circuit re-evaluation.

Active Substitutes with Identical Core Specifications:

HER305G A0G (Taiwan Semiconductor Corporation) maintains identical electrical parameters to the main part with active status and higher inventory (1779 units). This part is supplied in Cut Tape packaging and is REACH compliant, suitable for applications requiring extended supply chain documentation.

UF5404GP-AP (Micro Commercial Co) provides identical core electrical performance with 868 units in stock. The junction capacitance is marginally lower (75 pF versus 80 pF), which is negligible for standard rectification applications. This part is available in Tape & Box packaging.

Parametric Equivalents with Secondary Parameter Variations:

FR304GP-AP and FR304G A0G feature extended reverse recovery time (150 ns versus 50 ns) and reduced reverse leakage current (5 µA versus 10 µA). These characteristics are suitable for applications where lower leakage is prioritized over switching speed. FR304GP-AP is manufactured by Micro Commercial Co with 720 units in stock; FR304G A0G is supplied by Taiwan Semiconductor Corporation with 804 units in stock.

SF36G A0G and SF36GHA0G (Taiwan Semiconductor Corporation) offer improved reverse recovery time (35 ns versus 50 ns) and reduced reverse leakage current (5 µA versus 10 µA). SF36GHA0G includes AEC-Q101 automotive qualification, suitable for automotive-grade applications. Both parts are active with 894 and 737 units in stock respectively.

All substitute parts are ROHS3 compliant, operate across the same temperature range (-55°C to 150°C), and maintain the DO-201AD through-hole package configuration.

Frequently Asked Questions (FAQ)

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

A: Yes. HER305G-AP is manufactured by the same supplier (Micro Commercial Co) with identical electrical specifications, including voltage rating, current rating, forward voltage, and reverse recovery time. The only difference is product status (active versus obsolete) and packaging format (Tape & Box). No circuit modifications are required.

Q: What is the difference between HER305G-AP and HER305G A0G?

A: Both parts have identical electrical specifications and are based on the HER305 platform. The primary differences are manufacturer (Micro Commercial Co versus Taiwan Semiconductor Corporation) and packaging (Tape & Box versus Cut Tape). HER305G A0G has higher inventory availability (1779 units) and includes REACH compliance documentation.

Q: Can FR304GP-AP be substituted for HER305-AP in all applications?

A: FR304GP-AP meets the core voltage and current requirements but has a longer reverse recovery time (150 ns versus 50 ns) and lower reverse leakage current (5 µA versus 10 µA). This part is suitable for applications where switching speed is not critical and lower leakage is beneficial. Applications requiring fast recovery characteristics should use HER305G-AP, UF5404GP-AP, or SF36G A0G instead.

Q: What is the advantage of SF36G A0G over HER305G-AP?

A: SF36G A0G provides faster reverse recovery time (35 ns versus 50 ns) and lower reverse leakage current (5 µA versus 10 µA). These characteristics reduce switching losses and improve efficiency in high-frequency rectification circuits. Both parts maintain identical voltage and current ratings.

Q: Is SF36GHA0G suitable for automotive applications?

A: Yes. SF36GHA0G is qualified to AEC-Q101 automotive standards and carries automotive-grade designation. It maintains identical electrical specifications to SF36G A0G and is suitable for automotive rectification applications requiring qualified component documentation.

Q: What packaging options are available for HER305 equivalent diodes?

A: Substitute parts are available in multiple packaging formats: Tape & Box (TB) for standard production volumes, Cut Tape (CT) for smaller quantities, and unspecified packaging for certain variants. All parts use the same DO-201AD axial through-hole package configuration for PCB mounting.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. Parts manufactured by Taiwan Semiconductor Corporation (HER305G A0G, FR304G A0G, SF36G A0G, SF36GHA0G) include REACH compliance status documentation.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across the same junction temperature range as the main part: -55°C to 150°C. This range is maintained across all manufacturers and variants.

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