HER308-AP Equivalent & Substitute Parts

Part Overview

The HER308-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 1000 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design and procurement requirements. Substitute parts must maintain electrical performance across voltage, current, and thermal specifications while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 3 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	10 @ 1000 V	µA
Operating Temperature - Junction	-55 to 150	°C
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the obsolete HER308-AP is determined by strict equivalence across the following critical parameters:

Voltage Rating: All substitutes maintain 1000 V DC reverse voltage maximum
Current Rating: All substitutes maintain 3 A average rectified current
Forward Voltage Drop: All substitutes maintain 1.7 V maximum at 3 A
Reverse Recovery Time: All substitutes maintain 75 ns fast recovery characteristic
Reverse Leakage Current: All substitutes maintain 10 µA maximum at 1000 V
Package: All substitutes use DO-201AD axial through-hole configuration
Temperature Range: All substitutes maintain -55°C to 150°C junction operating range
Compliance: All substitutes are ROHS3 compliant

Substitute parts are classified into two categories: direct manufacturer equivalents from Micro Commercial Co (HER308G-AP) and parametric equivalents from alternative manufacturers (UF5408GP-AP, UF5408-E3/73).

Parameter Comparison

Parameter	HER308-AP	HER308G-AP	UF5408GP-AP	UF5408-E3/73
Manufacturer	Micro Commercial Co	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 3 A	1.7 V @ 3 A	1.7 V @ 3 A	1.7 V @ 3 A
Reverse Recovery Time (trr)	75 ns	75 ns	75 ns	75 ns
Current - Reverse Leakage @ Vr	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	50 pF @ 4V, 1MHz	50 pF @ 4V, 1MHz	36 pF @ 4V, 1MHz
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	—	Tape & Box (TB)	Tape & Box (TB)	Cut Tape (CT)
Inventory Status	674 Pcs	990 Pcs	751 Pcs	10200 Pcs

Engineering Selection Recommendations

HER308G-AP is the primary substitute for HER308-AP. Both parts are manufactured by Micro Commercial Co and share identical electrical specifications. HER308G-AP carries active product status, ensuring long-term availability and supply chain continuity. This part is supplied in Tape & Box packaging and maintains full parametric equivalence with the obsolete HER308-AP.

UF5408GP-AP is a parametric equivalent manufactured by Micro Commercial Co. All critical electrical parameters match the HER308-AP specification. UF5408GP-AP is active and available in Tape & Box packaging, providing an alternative within the same manufacturer ecosystem.

UF5408-E3/73 is a parametric equivalent manufactured by Vishay General Semiconductor - Diodes Division. All critical electrical parameters match the HER308-AP specification with the exception of junction capacitance (36 pF versus 50 pF at 4V, 1MHz). UF5408-E3/73 is active with the highest inventory availability (10200 Pcs) and is supplied in Cut Tape packaging. This part is suitable for applications where the lower capacitance value does not present a constraint.

All three substitute parts are ROHS3 compliant and maintain the same operating temperature range and through-hole DO-201AD package configuration as the original HER308-AP.

Frequently Asked Questions (FAQ)

Q: Can HER308G-AP directly replace HER308-AP in existing designs?

A: Yes. HER308G-AP maintains identical electrical specifications across voltage rating, current rating, forward voltage drop, reverse recovery time, reverse leakage current, and operating temperature range. Both use the DO-201AD through-hole package. The primary difference is product status (active versus obsolete) and packaging format (Tape & Box).

Q: What is the difference between HER308G-AP and UF5408GP-AP?

A: Both parts are manufactured by Micro Commercial Co and share identical electrical specifications. The primary difference is the base product number designation (HER308 versus UF5408). Both are active, available in Tape & Box packaging, and provide full parametric equivalence for the obsolete HER308-AP.

Q: Is UF5408-E3/73 suitable as a substitute despite the capacitance difference?

A: UF5408-E3/73 maintains all critical electrical parameters including voltage, current, forward voltage drop, reverse recovery time, and reverse leakage current. The junction capacitance is 36 pF versus 50 pF at 4V, 1MHz. This difference does not affect the core rectification function. Suitability depends on whether the application circuit relies on the specific capacitance value for filtering or frequency response characteristics.

Q: What packaging options are available for substitutes?

A: HER308G-AP and UF5408GP-AP are supplied in Tape & Box (TB) packaging. UF5408-E3/73 is supplied in Cut Tape (CT) packaging. All three maintain the DO-201AD axial through-hole component format for direct board-level substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. HER308G-AP, UF5408GP-AP, and UF5408-E3/73 are all ROHS3 compliant, matching the compliance status of the original HER308-AP.

Q: Which substitute offers the best inventory availability?

A: UF5408-E3/73 from Vishay General Semiconductor offers the highest inventory availability at 10200 Pcs. HER308G-AP and UF5408GP-AP from Micro Commercial Co offer 990 Pcs and 751 Pcs respectively.

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