HER105S-TP Equivalent & Substitute Parts

Part Overview

The HER105S-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The part operates across a junction temperature range of -55°C to 125°C and complies with RoHS3 standards.

Substiute Parts

HER105S-TP

Micro Commercial CoIn Stock: 983HER105S-TP Datasheet

Current PartRFQ

EU01V1

Sanken Electric USA Inc.In Stock: 726EU01V1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER105S-TP is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain a DC reverse voltage rating of 400 V or higher to ensure equivalent or superior voltage withstand capability.

Current Rating: The substitute part current rating must be equal to or greater than 1 A average rectified current. Parts with lower current ratings are not suitable for direct substitution.

Package and Mounting: The substitute must use axial through-hole packaging to maintain mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Speed Classification: The substitute must maintain fast recovery characteristics (≤ 500ns for currents > 200mA) to preserve switching performance in the application.

Temperature Range: The substitute operating temperature range must encompass or exceed the original -55°C to 125°C specification.

Compliance: The substitute must maintain RoHS compliance status for regulatory and supply chain continuity.

The EU01V1 manufactured by Sanken Electric USA Inc. meets these substitution criteria with equivalent voltage and package specifications, though with reduced current rating and modified electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Product Status: The HER105S-TP is classified as obsolete. The EU01V1 is an active product from an established manufacturer (Sanken Electric USA Inc.), ensuring ongoing availability and supply chain stability.

Voltage and Package Compatibility: Both parts share identical 400 V DC reverse voltage ratings and axial through-hole packaging, confirming mechanical and electrical interface compatibility.

Current Rating Differential: The EU01V1 is rated for 250 mA average rectified current, compared to the HER105S-TP's 1 A rating. Selection of the EU01V1 is appropriate only when the application circuit operates at or below 250 mA. Applications requiring the full 1 A capability of the original part require alternative solutions.

Reverse Recovery Time: The EU01V1 exhibits a reverse recovery time of 400 ns compared to the HER105S-TP's 50 ns. This difference may affect switching performance in high-frequency or time-critical applications. Verification of circuit timing requirements is necessary.

Temperature Range: The EU01V1 operates from -40°C to 150°C, compared to the original -55°C to 125°C range. Applications requiring operation below -40°C require alternative parts.

Regulatory Compliance: Both parts maintain RoHS compliance, supporting regulatory and procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the EU01V1 directly replace the HER105S-TP in all applications?

A: Direct replacement is limited by current rating. The EU01V1 is rated for 250 mA, while the HER105S-TP is rated for 1 A. The EU01V1 is suitable only for applications operating at or below 250 mA average rectified current. Applications requiring higher current must identify alternative parts.

Q: What is the impact of the different reverse recovery times?

A: The HER105S-TP has a reverse recovery time of 50 ns, while the EU01V1 has 400 ns. In applications with fast switching transitions or high-frequency operation, the longer recovery time of the EU01V1 may introduce additional switching losses or timing delays. Circuit simulation or testing is necessary to determine acceptability in specific applications.

Q: Are the axial packages physically identical?

A: Both parts use axial through-hole packaging, confirming mechanical compatibility with existing PCB layouts and assembly equipment. No physical modification to the circuit board or assembly process is required.

Q: Does the EU01V1 meet the same compliance standards?

A: Both parts are RoHS compliant. The HER105S-TP is RoHS3 compliant, while the EU01V1 is RoHS compliant. Both meet current regulatory requirements for hazardous substance restrictions.

Q: What is the significance of the different forward voltage specifications?

A: The HER105S-TP specifies 1.3 V forward voltage at 1 A, while the EU01V1 specifies 2.5 V at 250 mA. These measurements are taken at different operating currents and are not directly comparable. Forward voltage characteristics depend on the specific current level. Applications sensitive to forward voltage drop require evaluation at the actual operating current of the circuit.

Q: Can the EU01V1 be used in applications requiring -55°C operation?

A: No. The EU01V1 operates from -40°C to 150°C, which does not include the -55°C lower limit of the original HER105S-TP. Applications requiring operation at -55°C require alternative parts with equivalent low-temperature specifications.

Q: Why is the HER105S-TP classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by the original supplier. The EU01V1, as an active product, provides ongoing availability and manufacturer support for new designs and production continuity.