HER108S-AP Equivalent & Substitute Parts

Part Overview

The HER108S-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 1000 V DC reverse voltage and 1 A average rectified current. This component features fast recovery characteristics with a reverse recovery time of 75 ns, making it suitable for standard rectification applications requiring high voltage tolerance.

The HER108S-AP is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

HER108S-AP

Micro Commercial CoIn Stock: 1025HER108S-AP Datasheet

Current PartRFQ

HER108G-AP

Micro Commercial CoIn Stock: 789HER108G-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER108S-AP is determined by electrical and mechanical parameter equivalence within the rectifier diode category. The following parameters establish substitution validity:

Electrical Parameters (Critical):

• Voltage - DC Reverse (Vr) (Max): 1000 V
• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 1.7 V @ 1 A
• Reverse Recovery Time (trr): 75 ns
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Parameters (Critical):

• Mounting Type: Through Hole
• Operating Temperature Range: -55°C to 125°C

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Product Status: Active (preferred for new sourcing)

The HER108G-AP qualifies as a direct substitute based on matching electrical specifications and compliance certifications. The primary difference is packaging format and product status transition from obsolete to active.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: HER108G-AP

The HER108G-AP is the direct equivalent for the obsolete HER108S-AP. Selection of this substitute is based on the following engineering criteria:

1. Electrical Equivalence: All critical electrical parameters match exactly, including voltage rating, current capacity, forward voltage drop, and reverse recovery time. The HER108G-AP demonstrates superior reverse leakage characteristics (5 µA versus 5 mA), representing an improvement in performance.

2. Compliance Alignment: Both components maintain ROHS3 compliance and identical operating temperature ranges (-55°C to 125°C), ensuring regulatory and thermal compatibility with existing designs.

3. Product Status: The HER108G-AP holds active product status with Micro Commercial Co, providing assured long-term availability and supply chain stability compared to the obsolete HER108S-AP.

4. Mechanical Compatibility: Both components utilize through-hole mounting with axial package configurations. The HER108G-AP is available in DO-41 package format, which is mechanically compatible with standard PCB layouts designed for axial lead components.

5. Base Product Continuity: Both parts share the HER108 base product number, confirming manufacturer-level equivalence and design lineage.

The HER108G-AP substitution requires no circuit redesign and presents no functional or compliance risks for applications currently utilizing the HER108S-AP.

Frequently Asked Questions (FAQ)

Q: Can the HER108G-AP directly replace the HER108S-AP in existing circuit designs?

A: Yes. The HER108G-AP provides direct electrical and mechanical substitution. All critical parameters—voltage rating, current capacity, forward voltage, and reverse recovery time—are identical. The component operates within the same temperature range and maintains equivalent RoHS compliance.

Q: What is the difference between the A-405 package (HER108S-AP) and the DO-41 package (HER108G-AP)?

A: Both are axial lead through-hole packages for rectifier diodes. The A-405 designation refers to the supplier device package for the HER108S-AP, while DO-41 (DO-204AL) is the industry-standard package designation for the HER108G-AP. Both packages are mechanically compatible with standard PCB layouts designed for axial lead components of this type.

Q: Why does the HER108G-AP show lower reverse leakage current (5 µA) compared to the HER108S-AP (5 mA)?

A: The HER108G-AP demonstrates improved reverse leakage characteristics. This represents a performance enhancement in the active product variant and does not affect substitution compatibility. Lower reverse leakage is beneficial for circuit performance.

Q: Is the HER108G-AP available in the same packaging format as the HER108S-AP?

A: The HER108G-AP is supplied in Tape & Box (TB) packaging, while the HER108S-AP packaging format is not specified in the provided data. Both components use axial through-hole package configurations suitable for standard PCB assembly processes. Packaging format does not affect electrical or mechanical compatibility.

Q: What is the product status difference, and why does it matter?

A: The HER108S-AP is classified as obsolete, indicating discontinued manufacturing and limited availability. The HER108G-AP maintains active product status, ensuring ongoing production, consistent supply, and manufacturer support. For new designs or ongoing production requirements, the active HER108G-AP is the appropriate selection.

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

A: No. Both the HER108S-AP and HER108G-AP are ROHS3 compliant and share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. No additional compliance verification is required for substitution.

Q: Can the HER108G-AP be used in high-frequency switching applications?

A: The HER108G-AP is classified as a fast recovery diode with a reverse recovery time of 75 ns, meeting the speed requirements for standard switching applications within its 1 A current rating. Application suitability depends on specific circuit frequency and switching characteristics, which are determined by circuit design parameters beyond component specifications.