HER308-TP Equivalent & Substitute Parts

Part Overview

The HER308-TP is a general-purpose fast recovery 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. The device features a 75 ns reverse recovery time and operates across a junction temperature range of -55°C to 150°C. The HER308-TP is classified as obsolete; equivalent and substitute parts with active product status are available to support ongoing design requirements and procurement needs.

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	µA @ 1000 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HER308-TP are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 1.7 V @ 3 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 75 ns or 100 ns
Mounting Type: Through Hole
Package / Case: DO-201AD or DO-27 Axial
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Substitute Parts Identified:

HER308G-TP (Micro Commercial Co) – Direct manufacturer equivalent with identical electrical specifications and active product status. Packaging: Tape & Reel (TR).
UF5408GP-TP (Micro Commercial Co) – Parametric equivalent with identical electrical specifications. Packaging: Cut Tape (CT).
HER308G (HY Electronic (Cayman) Limited) – Parametric equivalent with identical electrical specifications. Package variant: DO-27. Reverse leakage current: 5 µA @ 1000 V (lower than main part). Capacitance: 30 pF @ 4V, 1MHz.
UF3010G_R2_00001 (Panjit International Inc.) – Parametric equivalent with identical electrical specifications. Reverse recovery time: 100 ns (within fast recovery classification). Reverse leakage current: 1 µA @ 1000 V (lower than main part).
UF5408-E3/54 (Vishay General Semiconductor - Diodes Division) – Parametric equivalent with identical electrical specifications. Packaging: Cut Tape (CT). Capacitance: 36 pF @ 4V, 1MHz.
UF5408-E3/73 (Vishay General Semiconductor - Diodes Division) – Parametric equivalent with identical electrical specifications. Packaging: Cut Tape (CT). Capacitance: 36 pF @ 4V, 1MHz.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Packaging Type
HER308-TP	Micro Commercial Co	1000	3	1.7 @ 3 A	75	10 @ 1000 V	DO-201AD	Obsolete	—
HER308G-TP	Micro Commercial Co	1000	3	1.7 @ 3 A	75	10 @ 1000 V	DO-201AD	Active	Tape & Reel (TR)
UF5408GP-TP	Micro Commercial Co	1000	3	1.7 @ 3 A	75	10 @ 1000 V	DO-201AD	Active	Cut Tape (CT)
HER308G	HY Electronic (Cayman) Limited	1000	3	1.7 @ 3 A	75	5 @ 1000 V	DO-27	Active	Tape & Box (TB)
UF3010G_R2_00001	Panjit International Inc.	1000	3	1.7 @ 3 A	100	1 @ 1000 V	DO-201AD	Active	Tape & Reel (TR)
UF5408-E3/54	Vishay General Semiconductor - Diodes Division	1000	3	1.7 @ 3 A	75	10 @ 1000 V	DO-201AD	Active	Cut Tape (CT)
UF5408-E3/73	Vishay General Semiconductor - Diodes Division	1000	3	1.7 @ 3 A	75	10 @ 1000 V	DO-201AD	Active	Cut Tape (CT)

Engineering Selection Recommendations

Primary Selection (Direct Replacement): HER308G-TP is the recommended direct substitute for HER308-TP. Both parts are manufactured by Micro Commercial Co with identical electrical specifications, matching voltage, current, and recovery time parameters. HER308G-TP carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance.

Alternative Selections (Parametric Equivalents):

UF5408GP-TP, UF5408-E3/54, and UF5408-E3/73 are parametric equivalents with active product status and ROHS3 compliance. These parts meet all electrical requirements of the HER308-TP and are suitable for applications where packaging format (Cut Tape) is acceptable.

UF3010G_R2_00001 (Panjit International Inc.) is a parametric equivalent with active product status and ROHS3 compliance. This part exhibits lower reverse leakage current (1 µA @ 1000 V) and a reverse recovery time of 100 ns, which remains within the fast recovery classification. The DO-201AD package matches the original specification.

HER308G (HY Electronic (Cayman) Limited) is a parametric equivalent with active product status and ROHS3 compliance. This part is available in DO-27 package format. The reverse leakage current is 5 µA @ 1000 V, lower than the original specification. Package compatibility must be verified for board-level integration.

Compliance Considerations: All substitute parts listed carry ROHS3 compliance and Moisture Sensitivity Level (MSL) 1 (Unlimited), matching the original HER308-TP specifications. REACH status is either REACH Unaffected or Vendor Undefined across the substitute options, consistent with component classification.

Frequently Asked Questions (FAQ)

Q1: Can HER308G-TP be used as a direct replacement for HER308-TP?

A: Yes. HER308G-TP is manufactured by the same supplier (Micro Commercial Co) and carries identical electrical specifications: 1000 V reverse voltage, 3 A average rectified current, 1.7 V forward voltage drop at 3 A, and 75 ns reverse recovery time. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard bulk). HER308G-TP is suitable for direct circuit substitution.

Q2: What is the difference between DO-201AD and DO-27 packages?

A: Both are axial through-hole packages for rectifier diodes. DO-201AD and DO-27 are physically similar but represent different package designations. HER308G uses the DO-27 designation while HER308-TP and most other substitutes use DO-201AD. Physical dimensions and lead spacing should be verified against PCB footprint requirements before selection.

Q3: Why do some substitute parts have lower reverse leakage current?

A: Reverse leakage current (Ir) is a parameter that can vary within the fast recovery rectifier diode category while maintaining functional equivalence. HER308G exhibits 5 µA @ 1000 V and UF3010G_R2_00001 exhibits 1 µA @ 1000 V, compared to 10 µA @ 1000 V for HER308-TP. Lower reverse leakage current is not a deficiency; it represents improved device characteristics and is acceptable for applications designed for the original specification.

Q4: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original HER308-TP specification. This ensures regulatory conformance for applications subject to RoHS directives.

Q5: What is the significance of reverse recovery time (trr) in these parts?

A: Reverse recovery time is the interval required for a forward-biased diode to switch to reverse bias. All substitute parts are classified as fast recovery diodes with trr ≤ 500 ns at > 200 mA. HER308-TP, HER308G-TP, UF5408GP-TP, UF5408-E3/54, and UF5408-E3/73 specify 75 ns trr. UF3010G_R2_00001 specifies 100 ns trr. Both values satisfy the fast recovery classification and are functionally equivalent for circuit applications.

Q6: Which substitute part has the highest inventory availability?

A: UF5408-E3/54 (Vishay General Semiconductor - Diodes Division) has 61,860 pieces in stock, the highest inventory level among all listed substitutes. This part is available in Cut Tape (CT) packaging and meets all electrical specifications of HER308-TP.

Q7: Can packaging format affect circuit performance?

A: Packaging format (Tape & Reel, Cut Tape, Tape & Box) affects procurement, handling, and assembly processes but does not alter electrical performance. All substitute parts in this list are through-hole axial diodes with identical electrical characteristics. Selection should be based on assembly equipment compatibility and procurement requirements.

Q8: Is REACH compliance status important for part selection?

A: REACH status indicates regulatory compliance for chemical substance restrictions in the European Union. Substitute parts carry either REACH Unaffected or Vendor Undefined status. For applications subject to REACH requirements, parts with REACH Unaffected designation (HER308G-TP, UF5408GP-TP, UF3010G_R2_00001, UF5408-E3/54, UF5408-E3/73) are preferred. HER308G carries Vendor Undefined status and should be verified with the manufacturer for specific REACH compliance requirements.

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