HER104S-TP Equivalent & Substitute Parts

Part Overview

The HER104S-TP is a general-purpose rectifier diode rated for 300 V DC reverse voltage and 1 A average rectified current. Manufactured by Micro Commercial Co, this component features fast recovery characteristics with a reverse recovery time of 50 ns and is housed in an A-405 axial package for through-hole mounting applications.

The HER104S-TP is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and new design requirements where this component is specified or functionally required.

Substiute Parts

HER104S-TP

Micro Commercial CoIn Stock: 871HER104S-TP Datasheet

Current PartRFQ

HER104G-TP

Micro Commercial CoIn Stock: 918HER104G-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER104S-TP 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): 300 V
• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): 50 ns

Mechanical Parameters (Critical):

• Mounting Type: Through Hole
• Package Category: Axial or equivalent through-hole package

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: -55°C to 125°C

The HER104G-TP qualifies as a direct substitute based on matching all critical electrical parameters, maintaining through-hole mounting compatibility, and meeting identical RoHS compliance requirements. The difference in package designation (DO-41 versus A-405) represents a variation within the axial through-hole package family and does not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

The HER104G-TP is the qualified substitute for the HER104S-TP based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly, including reverse voltage rating, forward current capacity, forward voltage drop, recovery speed classification, and reverse recovery time. These parameters ensure functional equivalence in rectification applications.

Mechanical Compatibility: Both components utilize through-hole axial package configurations. The HER104G-TP employs the DO-41 package designation, which is a standard axial through-hole format compatible with circuit board layouts designed for the A-405 package.

Compliance Status: The HER104G-TP maintains ROHS3 compliance and operates within the identical temperature range (-55°C to 125°C), ensuring regulatory and thermal compatibility.

Product Availability: The HER104G-TP carries an Active product status, providing ongoing availability and supply chain continuity compared to the obsolete HER104S-TP.

Selection of the HER104G-TP eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the HER104G-TP be used as a direct replacement for the HER104S-TP in existing circuit boards?

A: Yes. The HER104G-TP provides electrical equivalence across all critical parameters and utilizes a through-hole axial package format compatible with HER104S-TP board layouts. Both components share identical voltage ratings, current capacity, forward voltage characteristics, and recovery time specifications.

Q: What is the difference between the A-405 and DO-41 package designations?

A: Both A-405 and DO-41 are axial through-hole package formats for diodes. The designations represent different naming conventions for mechanically and electrically equivalent packages. Both accommodate standard through-hole mounting on printed circuit boards with identical lead spacing and orientation.

Q: Are there compliance differences between the HER104S-TP and HER104G-TP?

A: No. Both components are ROHS3 compliant and operate within the same temperature range (-55°C to 125°C). Compliance certifications are equivalent.

Q: Why is the HER104S-TP classified as obsolete?

A: The HER104S-TP has reached end-of-life status with the manufacturer. The HER104G-TP represents the active production equivalent, ensuring continued availability and supply chain support.

Q: What parameters must match for a diode to qualify as a substitute for the HER104S-TP?

A: Substitute diodes must match the following parameters: 300 V DC reverse voltage rating, 1 A average rectified current, 1 V maximum forward voltage at 1 A, fast recovery speed classification (≤ 500ns), 50 ns reverse recovery time, through-hole mounting type, and axial package configuration. RoHS3 compliance and operating temperature range (-55°C to 125°C) must also be maintained.

Q: Is the reverse leakage current specification identical between the two parts?

A: The HER104S-TP specifies 5 mA reverse leakage at 300 V, while the HER104G-TP specifies 5 µA reverse leakage at 300 V. The HER104G-TP exhibits lower reverse leakage current, which represents an improvement in performance characteristics and does not preclude substitution.