HER157-AP Equivalent & Substitute Parts

Part Overview

The HER157-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 800 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 equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a junction temperature range of -55°C to 125°C and demonstrates fast recovery characteristics with a reverse recovery time of 75 ns.

Substiute Parts

HER157-AP

Micro Commercial CoIn Stock: 963HER157-AP Datasheet

Current PartRFQ

1N4585GP-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 10221N4585GP-E3/54 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER157-AP is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain the 800 V DC reverse voltage specification to ensure safe operation in the intended circuit application.

Current Rating: The substitute part current rating must equal or exceed the 1.5 A average rectified current requirement. Parts with lower current ratings are not suitable.

Package Type: The substitute must use the DO-15 (DO-204AC) through-hole axial package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Recovery Characteristics: The substitute part must support the required speed classification. Fast recovery diodes (≤500 ns) are preferred for applications requiring the HER157-AP's 75 ns reverse recovery time.

Temperature Range: The substitute must support the operating junction temperature range of -55°C to 125°C or wider.

Compliance: The substitute must maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level.

The 1N4585GP-E3/54 manufactured by Vishay General Semiconductor qualifies as a substitute based on matching voltage rating, package type, and compliance requirements, with the understanding that its 1 A current rating is lower than the original 1.5 A specification.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement:

The HER157-AP is classified as obsolete. The 1N4585GP-E3/54 is an active product from a major semiconductor manufacturer (Vishay), ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and MSL 1 ratings, supporting environmental and manufacturing standards.

Current Rating Consideration:

The substitute part 1N4585GP-E3/54 is rated for 1.0 A average rectified current, compared to the original 1.5 A specification. Circuit designs operating at or near the 1.5 A limit require thermal and current distribution analysis to confirm the substitute part operates within acceptable margins.

Recovery Speed Difference:

The HER157-AP exhibits fast recovery characteristics (75 ns reverse recovery time), while the 1N4585GP-E3/54 demonstrates standard recovery characteristics (2000 ns). Applications sensitive to switching speed, electromagnetic interference, or high-frequency operation must evaluate this performance difference against circuit requirements.

Temperature Range:

The substitute part supports an extended operating temperature range (-65°C to 175°C) compared to the original (-55°C to 125°C), providing additional thermal margin in applications with wide ambient temperature variations.

Package Compatibility:

Both parts use identical DO-15 (DO-204AC) through-hole axial packaging, ensuring direct mechanical and electrical compatibility with existing PCB designs and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 1N4585GP-E3/54 directly replace the HER157-AP in all applications?

A: Direct replacement is possible from a mechanical and voltage standpoint, as both parts use the DO-15 package and share the 800 V rating. However, the substitute part's 1.0 A current rating is lower than the original 1.5 A specification. Applications operating at currents above 1.0 A require circuit analysis to confirm acceptable performance. Additionally, the substitute part's standard recovery speed (2000 ns) differs significantly from the original fast recovery speed (75 ns), which may affect switching performance in high-frequency circuits.

Q: What is the significance of the reverse recovery time difference?

A: Reverse recovery time (trr) determines how quickly a diode transitions from conducting to blocking state. The HER157-AP's 75 ns fast recovery time is suitable for high-frequency switching applications and reduces electromagnetic interference. The 1N4585GP-E3/54's 2000 ns standard recovery time is appropriate for lower-frequency rectification applications. Circuit operating frequency and switching requirements determine whether this difference is acceptable.

Q: Are both parts RoHS compliant?

A: Yes, both the HER157-AP and 1N4585GP-E3/54 are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting environmental and manufacturing standards for industrial and commercial applications.

Q: What is the difference in forward voltage drop between these parts?

A: The HER157-AP exhibits a forward voltage drop of 1.7 V at 1.5 A, while the 1N4585GP-E3/54 exhibits 1.0 V at 1.0 A. Forward voltage characteristics are measured at different current levels, making direct comparison complex. At equivalent current densities, the substitute part typically demonstrates lower forward voltage, resulting in reduced power dissipation in rectification circuits.

Q: Why is the substitute part listed as active while the original is obsolete?

A: The HER157-AP has reached end-of-life status with Micro Commercial Co, meaning new production has ceased. The 1N4585GP-E3/54 remains in active production by Vishay, ensuring continued availability, technical support, and supply chain reliability for new designs and ongoing production requirements.

Q: Does the extended temperature range of the substitute part provide any advantage?

A: The 1N4585GP-E3/54 supports -65°C to 175°C operation compared to the HER157-AP's -55°C to 125°C range. This extended range provides additional thermal margin in applications with extreme ambient temperatures or high-power dissipation environments, though it does not affect performance in standard operating conditions.

Q: Are there any packaging differences between these parts?

A: Both parts use identical DO-15 (DO-204AC) through-hole axial packaging. The HER157-AP is supplied in standard packaging, while the 1N4585GP-E3/54 is supplied in Tape & Reel (TR) format. This difference affects procurement and assembly processes but does not impact electrical or mechanical compatibility.