HER108-AP Equivalent & Substitute Parts

Part Overview

The HER108-AP is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 axial package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Locating equivalent and substitute parts is necessary to support ongoing maintenance, repair, and legacy system support where the original part is no longer in production or inventory becomes depleted.

Substiute Parts

HER108-AP

Micro Commercial CoIn Stock: 759HER108-AP Datasheet

Current PartRFQ

HER108G-AP

Micro Commercial CoIn Stock: 789HER108G-AP Datasheet

DirectRFQ

1N4007RLG

onsemiIn Stock: 1503791N4007RLG Datasheet

SimilarRFQ

BA159G A0G

Taiwan Semiconductor CorporationIn Stock: 1297BA159G A0G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HER108-AP are selected based on electrical and mechanical parameter compatibility. The critical parameters that determine substitutability are:

Electrical Parameters:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 1000 V
• Current - Average Rectified (Io): Must equal or exceed 1 A
• Mounting Type: Must be Through Hole
• Package / Case: Must be compatible with DO-204AL, DO-41, or Axial configurations

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: Must accommodate the application's thermal requirements

Substitute parts are grouped into two categories: direct manufacturer equivalents (same manufacturer, active product status) and similar cross-manufacturer alternatives (equivalent electrical specifications, different manufacturers).

Parameter Comparison

Engineering Selection Recommendations

HER108G-AP (Direct Equivalent - Recommended Primary Choice)

The HER108G-AP is the direct manufacturer equivalent from Micro Commercial Co with active product status. This part maintains identical electrical specifications to the HER108-AP, including voltage rating, current capacity, forward voltage, and reverse recovery time. The HER108G-AP differs only in packaging format (Tape & Box versus the original packaging) and product status (Active versus Obsolete). This part is suitable for direct substitution in all applications where the HER108-AP was originally specified. Current inventory of 735 pieces is available.

BA159G A0G (Similar Alternative - Secondary Choice)

The BA159G A0G from Taiwan Semiconductor Corporation is an active product that meets all electrical requirements for substitution. It maintains the 1000 V reverse voltage rating and 1 A current capacity. The forward voltage is lower at 1.2 V compared to 1.7 V, which results in reduced power dissipation. The reverse recovery time is 250 ns, which is longer than the HER108-AP's 75 ns but remains within acceptable limits for general-purpose rectification applications. This part is ROHS3 compliant and has 1287 pieces in current inventory.

1N4007RLG (Similar Alternative - Tertiary Choice)

The 1N4007RLG from onsemi meets the voltage and current requirements but carries a "Not For New Designs" product status designation. This part exhibits a lower forward voltage of 1.1 V and a wider operating temperature range (-65°C to 175°C). However, it uses standard recovery speed (>500ns) rather than fast recovery, which may affect performance in applications sensitive to switching speed. This part is suitable only for legacy system support where the original design specifications explicitly allow standard recovery diodes. Current inventory of 150,300 pieces is available.

Frequently Asked Questions (FAQ)

Q: Can the HER108G-AP be used as a direct replacement for the HER108-AP?

A: Yes. The HER108G-AP is the direct manufacturer equivalent with identical electrical specifications. The only differences are packaging format and product status. It is suitable for direct substitution in all applications.

Q: What is the difference between the HER108-AP and the BA159G A0G?

A: Both parts meet the 1000 V and 1 A requirements. The BA159G A0G has a lower forward voltage (1.2 V versus 1.7 V), resulting in lower power dissipation. The reverse recovery time is longer (250 ns versus 75 ns). The BA159G A0G is an active product from Taiwan Semiconductor Corporation, while the HER108-AP is obsolete.

Q: Why is the 1N4007RLG marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that onsemi has designated this part for legacy applications only. While it meets the electrical requirements, it uses standard recovery speed rather than fast recovery. New designs should prioritize the HER108G-AP or BA159G A0G.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The HER108G-AP, 1N4007RLG, and BA159G A0G are all ROHS3 compliant, matching the compliance status of the original HER108-AP.

Q: What is the significance of reverse recovery time in selecting a substitute?

A: Reverse recovery time affects switching speed and power dissipation in high-frequency applications. The HER108-AP and HER108G-AP have 75 ns recovery time (fast recovery). The BA159G A0G has 250 ns (still fast recovery). The 1N4007RLG uses standard recovery (>500ns). For applications requiring fast switching, the HER108G-AP or BA159G A0G are preferred.

Q: Can these parts be used in applications requiring the full -55°C to 125°C temperature range?

A: Yes. All substitute parts support at least the -55°C to 125°C range. The 1N4007RLG and BA159G A0G support extended ranges (-65°C to 175°C and -55°C to 150°C respectively), providing additional thermal margin.

Q: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package. All substitute parts are available in this package configuration and are mechanically compatible.