HER158-AP Equivalent & Substitute Parts

Part Overview

The HER158-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 1000 V DC reverse voltage and 1.5 A average rectified current in a DO-15 through-hole package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The fast recovery characteristics (≤500 ns) and compact axial package make this diode suitable for standard rectification applications requiring moderate current handling at high voltage ratings.

Substiute Parts

HER158-AP

Micro Commercial CoIn Stock: 919HER158-AP Datasheet

Current PartRFQ

HER208G-AP

Micro Commercial CoIn Stock: 1253HER208G-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER158-AP is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute part must maintain the same maximum DC reverse voltage rating of 1000 V to ensure circuit protection and reliability.

Package Compatibility: The substitute part must use the same DO-15 through-hole axial package to ensure mechanical fit and board-level compatibility without redesign.

Current Rating: The substitute part may exceed the original 1.5 A current rating, provided all other electrical characteristics remain compatible. Higher current ratings do not compromise circuit function in applications requiring lower current.

Recovery Characteristics: Fast recovery speed (≤500 ns) and reverse recovery time (75 ns) must be maintained to preserve switching performance.

Leakage and Capacitance: Reverse leakage current and junction capacitance must remain within the specified ranges to maintain circuit performance.

Compliance and Status: The substitute part must meet RoHS3 compliance requirements and preferably maintain active product status for long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The HER208G-AP is a direct substitute for the HER158-AP based on the following engineering criteria:

Electrical Equivalence: Both parts share identical voltage ratings (1000 V DC reverse), recovery characteristics (75 ns reverse recovery time), leakage specifications (5 µA @ 1000 V), and forward voltage characteristics (1.7 V). The HER208G-AP is rated for 2 A average rectified current compared to the HER158-AP's 1.5 A rating, providing additional current capacity without compromising circuit compatibility.

Mechanical Compatibility: Both parts use the DO-15 through-hole axial package, ensuring direct board-level substitution without layout modifications or mechanical redesign.

Compliance and Availability: The HER208G-AP maintains ROHS3 compliance and holds active product status, ensuring long-term availability and supply chain continuity. The HER158-AP's obsolete status necessitates this substitution for production support.

Temperature Performance: The HER208G-AP extends the maximum junction operating temperature to 150°C compared to the HER158-AP's 125°C, providing improved thermal margin in applications subject to elevated ambient conditions.

Frequently Asked Questions (FAQ)

Q: Can the HER208G-AP directly replace the HER158-AP without circuit modifications?

A: Yes. The HER208G-AP is electrically and mechanically compatible with the HER158-AP. Both parts share identical voltage ratings, package configurations, and recovery characteristics. The higher current rating of the HER208G-AP (2 A versus 1.5 A) does not require circuit changes for applications designed for the original 1.5 A specification.

Q: What is the primary reason for substituting the HER158-AP?

A: The HER158-AP is classified as obsolete, making it unavailable for new production orders. The HER208G-AP is an active product from the same manufacturer with equivalent electrical specifications and the same package type, ensuring design continuity and supply reliability.

Q: Are there any thermal considerations when using the HER208G-AP as a substitute?

A: The HER208G-AP supports a higher maximum junction temperature (150°C) compared to the HER158-AP (125°C). This provides additional thermal headroom and may improve reliability in applications operating at elevated temperatures. No thermal derating is required for applications originally designed for the HER158-AP.

Q: Do both parts use the same package and pinout?

A: Yes. Both the HER158-AP and HER208G-AP use the DO-15 through-hole axial package with identical mechanical dimensions and pinout. Direct board-level substitution is possible without layout changes.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and meet the same environmental and regulatory standards. The HER208G-AP includes REACH Unaffected status, providing additional regulatory documentation for applications requiring comprehensive compliance verification.

Q: What is the impact of the higher current rating on circuit performance?

A: The HER208G-AP's 2 A rating does not negatively impact circuits designed for 1.5 A operation. The higher current capacity provides design margin and may reduce forward voltage drop under load, potentially improving overall circuit efficiency.