HER151-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The HER151-AP is a general purpose rectifier diode rated for 50 V DC reverse voltage and 1.5 A average rectified current in a through-hole DO-15 package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement continuity. The HER151-AP remains functionally available in inventory but requires substitution planning for long-term production applications.

Substiute Parts

HER151-AP

Micro Commercial CoIn Stock: 984HER151-AP Datasheet

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HER151G A0G

Taiwan Semiconductor CorporationIn Stock: 880HER151G A0G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER151-AP is determined by strict equivalence across the following electrical and mechanical parameters:

Mandatory Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 50 V
• Current - Average Rectified (Io): 1.5 A
• Voltage - Forward (Vf) (Max) @ If: 1 V @ 1.5 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): 50 ns
• Current - Reverse Leakage @ Vr: 5 µA @ 50 V
• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial

The HER151G A0G from Taiwan Semiconductor Corporation meets all mandatory electrical parameters and maintains package compatibility. This substitute is classified as active product status, providing long-term availability assurance. Both parts share identical base product designation (HER151) and comply with ROHS3 requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: HER151G A0G

The HER151G A0G is the direct functional equivalent for the obsolete HER151-AP. Selection of this substitute is based on the following engineering factors:

Product Status Consideration: The HER151-AP is classified as obsolete, while the HER151G A0G maintains active product status. This distinction ensures continued availability, technical support, and manufacturing consistency for new designs and production replenishment.

Compliance Alignment: Both parts maintain ROHS3 compliance, satisfying regulatory requirements for electronic component procurement. The HER151G A0G additionally carries REACH Unaffected status, providing expanded compliance documentation for regulated markets.

Electrical Parameter Equivalence: All critical electrical specifications match exactly between the main part and substitute, including reverse voltage rating, rectified current capacity, forward voltage drop, recovery time characteristics, and reverse leakage current. These parameters determine functional interchangeability in circuit applications.

Package and Mounting Compatibility: Both parts utilize identical through-hole mounting in DO-204AC/DO-15 axial package configuration, enabling direct board-level substitution without layout modification.

Temperature Operating Range: The HER151G A0G extends the maximum junction temperature to 150°C compared to the HER151-AP specification of 125°C, providing enhanced thermal margin in applications approaching temperature limits.

Capacitance Differential: The substitute exhibits lower junction capacitance (35 pF versus 50 pF at 4V, 1MHz), which may provide improved high-frequency performance characteristics in switching applications.

Frequently Asked Questions (FAQ)

Q: Can the HER151G A0G be used as a direct replacement for the HER151-AP in existing designs?

A: Yes. The HER151G A0G meets all electrical and mechanical specifications of the HER151-AP. Both parts share identical voltage ratings, current capacity, forward voltage characteristics, and recovery time parameters. Through-hole mounting and DO-15 package compatibility enable direct board-level substitution.

Q: What is the primary reason for substituting the HER151-AP?

A: The HER151-AP is classified as obsolete product status. The HER151G A0G maintains active status, ensuring long-term availability, consistent manufacturing, and ongoing technical support for production applications.

Q: Are there differences in electrical performance between these parts?

A: The electrical parameters are equivalent across all critical specifications: 50 V reverse voltage, 1.5 A rectified current, 1 V forward voltage drop, 50 ns recovery time, and 5 µA reverse leakage current. The substitute exhibits lower junction capacitance (35 pF versus 50 pF), which may improve performance in high-frequency switching circuits.

Q: Does the extended temperature range of the HER151G A0G affect circuit design?

A: The HER151G A0G operates to 150°C junction temperature compared to 125°C for the HER151-AP. This extended range provides additional thermal margin but does not require design modification. Existing thermal calculations based on the HER151-AP remain valid.

Q: Are both parts RoHS compliant?

A: Yes. Both the HER151-AP and HER151G A0G comply with ROHS3 requirements. The substitute additionally carries REACH Unaffected status.

Q: What is the package designation for these diodes?

A: Both parts use the DO-204AC package designation, also referenced as DO-15 in axial through-hole configuration. This standardized package enables mechanical and electrical interchangeability.

Q: Are there any other equivalent parts listed for the HER151G A0G?

A: The HER151G A0G documentation references EGP20A and EGP20A-E3/54 as additional equivalents. Verification of these parts against the mandatory electrical and mechanical parameters is required for substitution consideration.