TPC18HM3/86A Equivalent & Substitute Parts

Part Overview

The TPC18HM3/86A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in automotive applications, featuring a 14.5V reverse standoff voltage and 26.5V maximum clamping voltage. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The TPC18AHM3_A/H serves as a direct equivalent from the same manufacturer and product series.

Substiute Parts

TPC18HM3/86A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1025TPC18HM3/86A Datasheet

Current PartRFQ

TPC18AHM3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 758TPC18AHM3_A/H Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by the following critical parameters:

• Reverse standoff voltage tolerance and breakdown voltage range
• Maximum clamping voltage at peak pulse current
• Peak pulse current capability
• Peak pulse power dissipation
• Operating temperature range
• Package compatibility (TO-277A SMPC)
• Automotive grade and AEC-Q101 qualification
• RoHS and REACH compliance status

The TPC18AHM3_A/H qualifies as a direct substitute based on matching package type (TO-277A SMPC), identical operating temperature range (-65°C to 185°C), equivalent power rating (1500W), automotive grade classification, and AEC-Q101 qualification. Both parts belong to the PAR® and eSMP® series from Vishay, confirming design compatibility within the same product family.

Parameter Comparison

Engineering Selection Recommendations

The TPC18AHM3_A/H is the appropriate substitute for the obsolete TPC18HM3/86A. Selection is justified by the following factors:

The substitute maintains identical package geometry (TO-277A SMPC) and mounting type (surface mount), ensuring direct PCB compatibility without layout modifications. Both parts carry automotive grade classification and AEC-Q101 qualification, meeting the same reliability and quality standards required for automotive applications.

The substitute exhibits slightly higher reverse standoff voltage (15.3V vs. 14.5V) and breakdown voltage (17.1V vs. 16.2V), with marginally improved peak pulse current capability (59.5A vs. 56.6A). The clamping voltage is lower (25.2V vs. 26.5V), providing enhanced transient suppression performance. These parameter variations remain within acceptable substitution tolerances for TVS diode applications.

The TPC18AHM3_A/H carries active product status, ensuring long-term availability and supply chain continuity. Both parts maintain identical operating temperature range, power dissipation rating, and compliance certifications (ROHS3, REACH Unaffected).

Frequently Asked Questions (FAQ)

Q: Can TPC18AHM3_A/H be used as a direct replacement for TPC18HM3/86A without circuit modifications?

A: Yes. Both parts share identical package type (TO-277A SMPC), mounting configuration (surface mount), operating temperature range (-65°C to 185°C), and power rating (1500W). No PCB layout or schematic changes are required.

Q: What are the key differences between these two parts?

A: The substitute exhibits higher reverse standoff voltage (15.3V vs. 14.5V), higher breakdown voltage (17.1V vs. 16.2V), and slightly higher peak pulse current (59.5A vs. 56.6A). The clamping voltage is lower (25.2V vs. 25.2V), improving transient suppression. The main part is obsolete; the substitute is active.

Q: Are both parts qualified for automotive applications?

A: Yes. Both parts carry automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality requirements.

Q: What is the significance of the product status difference?

A: The TPC18HM3/86A is classified as obsolete, indicating discontinued production. The TPC18AHM3_A/H is active, ensuring ongoing availability and manufacturing support.

Q: Do these parts have identical moisture sensitivity ratings?

A: Yes. Both parts carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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

A: No. Both parts are ROHS3 compliant and REACH Unaffected, meeting identical environmental and regulatory requirements.