TPSMP18HM3/85A Equivalent & Substitute Parts

Part Overview

The TPSMP18HM3/85A 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-grade applications, featuring a 14.5V reverse standoff voltage and 26.5V maximum clamping voltage. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TPSMP18HM3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 861TPSMP18HM3/85A Datasheet

Current PartRFQ

TPSMP18AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 6865TPSMP18AHM3_A/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMP18HM3/85A is determined by strict alignment of the following critical parameters:

Mandatory Matching Criteria:

• Unidirectional channel configuration (1 channel required)
• Package type: DO-220AA (SMP) surface mount
• Mounting type: Surface mount
• Automotive grade classification
• AEC-Q101 qualification
• Operating temperature range: -65°C ~ 185°C (TJ)
• RoHS3 compliance
• Base product series: TPSMP18

Allowable Parameter Variance: Substitute parts must maintain functional equivalence within the following electrical parameter ranges:

• Voltage - Reverse Standoff (Typ): ±1.0V tolerance
• Voltage - Breakdown (Min): ±1.0V tolerance
• Voltage - Clamping (Max) @ Ipp: ±1.5V tolerance
• Current - Peak Pulse (10/1000µs): ±1.0A tolerance
• Power - Peak Pulse: Equal or greater capacity

The TPSMP18AHM3_A/I meets all mandatory criteria and falls within allowable electrical parameter variance, qualifying as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The TPSMP18AHM3_A/I is a qualified substitute for the obsolete TPSMP18HM3/85A based on the following engineering factors:

Compliance and Certification: Both components maintain identical automotive-grade classification and AEC-Q101 qualification, ensuring compatibility with automotive system requirements and supply chain standards.

Product Status Advantage: The substitute part carries Active product status with significantly higher inventory availability (6800 pcs vs. 805 pcs), providing supply chain continuity and reducing procurement risk for ongoing production and field support.

Electrical Parameter Alignment: All electrical parameters fall within acceptable variance ranges. The substitute exhibits marginally improved peak pulse current capability (15.9A vs. 15.1A) and slightly lower clamping voltage (25.5V vs. 26.5V), both favorable characteristics for transient suppression performance.

Package and Thermal Compatibility: Identical package designation (DO-220AA), mounting type (surface mount), and operating temperature range (-65°C ~ 185°C) ensure direct mechanical and thermal compatibility without PCB redesign or thermal management modifications.

Regulatory Compliance: Both components maintain ROHS3 compliance and identical moisture sensitivity levels, satisfying environmental and handling requirements without additional qualification.

Frequently Asked Questions (FAQ)

Q: Can TPSMP18AHM3_A/I be used as a direct replacement for TPSMP18HM3/85A in existing designs?

A: Yes. Both components share identical package type (DO-220AA), mounting configuration (surface mount), automotive grade, and AEC-Q101 qualification. Electrical parameters align within acceptable engineering tolerances for transient voltage suppression applications.

Q: What is the significance of the product status change from Obsolete to Active?

A: The Active status of TPSMP18AHM3_A/I indicates ongoing manufacturing and availability through authorized distributors. This eliminates supply chain discontinuity associated with obsolete components and provides long-term procurement stability.

Q: Are there differences in clamping voltage between these parts?

A: The substitute exhibits a 1.0V lower maximum clamping voltage (25.5V vs. 26.5V). This represents improved transient suppression performance, as lower clamping voltage provides more aggressive overvoltage protection. This variance is within acceptable engineering tolerance for this component category.

Q: Do packaging and handling requirements differ between these parts?

A: No. Both components use identical DO-220AA surface mount packaging with MSL 1 (Unlimited) moisture sensitivity classification. Handling, storage, and assembly processes remain unchanged.

Q: Is the higher peak pulse current of the substitute part a concern?

A: No. The substitute's 0.8A higher peak pulse current (15.9A vs. 15.1A) represents enhanced capability and does not create compatibility issues. Both components maintain identical 400W peak pulse power rating.

Q: What certifications apply to both components?

A: Both TPSMP18HM3/85A and TPSMP18AHM3_A/I carry AEC-Q101 automotive qualification and ROHS3 compliance, meeting automotive system requirements and environmental regulations without additional qualification steps.