Vishay General Semiconductor - Diodes Division TPC27AHM3_A/H

Overview

TPC27AHM3_A/H from Vishay General Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) in TO-277A (SMPC) package, designed for robust overvoltage protection of sensitive electronics. It features a breakdown voltage of 25.7–28.4 V at 1 mA, clamping voltage of 37.5 V at 40 A peak pulse current, and operates up to +185 °C junction temperature. It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive powertrain control modules.

For engineers reviewing the TPC27AHM3_A/H datasheet, TPC27AHM3_A/H pinout, TPC27AHM3_A/H application, or TPC27AHM3_A/H equivalent, key selection criteria include its 1500 W peak pulse power rating, unidirectional polarity, low-profile 1.1 mm height, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction per HM3 suffix.

Technical Context

The TPC27AHM3_A/H employs passivated anisotropic rectifier technology optimized for fast response time and low incremental surge resistance. Its unidirectional architecture provides clamping only during reverse-biased transients, with no forward conduction beyond typical diode behavior - making it suitable for DC-biased signal or power line protection.

Designed for high-reliability automotive environments, the device supports continuous operation from –65 °C to +185 °C junction temperature and meets JESD201 Class 2 whisker resistance. Its TO-277A (SMPC) package enables automated placement and delivers thermal performance validated on 2 oz. copper PCB layouts per JEDEC standards.

Key Specifications

Pinout & Package

TPC27AHM3_A/H uses the TO-277A (SMPC) package: a 3-terminal, single-die, surface-mount plastic case with cathode-anode-cathode terminal arrangement. Dimensions conform to JEDEC TO-277A standard; mounting pad layout specified for optimal thermal dissipation on 2 oz. copper PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS protection applications.

Compared with SMAJ28A-E3/57T and TPC27AHM3_T/R, the TPC27AHM3_A/H uniquely combines AEC-Q101 qualification, 1500 W surge rating, and 1.1 mm profile in a single-source automotive-grade TVS - enabling direct use in safety-critical ECU designs without derating or secondary validation.

Availability

TPC27AHM3_A/H is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive inputs, telecom base station DC feeds, and consumer appliance power supplies requiring stable component supply, long-lifecycle support, and consistent AEC-Q101 compliance.

Supply support for TPC27AHM3_A/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.

The TPC series belongs to Vishay's PAR® family of high-power surface-mount TVS diodes, engineered specifically for automotive and industrial systems demanding AEC-Q101 qualification, high-temperature operation, and robust transient immunity.

FAQ

What is the exact breakdown voltage range for TPC27AHM3_A/H?

The TPC27AHM3_A/H has a guaranteed breakdown voltage (V_BR) range of 25.7 V to 28.4 V at a test current of 1.0 mA, measured per ANSI/IEEE C62.35 standards. This specification is verified per production lot and documented in Vishay's Electrical Characteristics table for the TPC27A device variant. The TPC27AHM3_A/H inherits these values directly as the HM3_A/H suffix denotes packaging and revision only.

Is TPC27AHM3_A/H suitable for bidirectional transient protection?

No, the TPC27AHM3_A/H is strictly unidirectional. Its internal structure supports clamping only when the cathode is biased positively relative to the anode - it does not provide symmetrical protection for AC or bipolar transients. For bidirectional applications, Vishay offers separate part numbers such as the P6SMB series; the TPC27AHM3_A/H must be used with correct polarity orientation in DC-biased circuits.

Does TPC27AHM3_A/H require derating at elevated ambient temperatures?

Yes, the TPC27AHM3_A/H must be derated above T_A = 25 °C per Figure 2 in the datasheet. Its peak pulse power (1500 W) and peak pulse current (40 A) decrease linearly with increasing junction temperature, reaching ~75 % of rated value at 125 °C ambient (assuming standard PCB thermal conditions). Designers must apply thermal modeling or consult Vishay's derating curves to ensure safe operation in high-temperature enclosures.

What does the "HM3_A/H" suffix indicate in TPC27AHM3_A/H?

The "HM3" portion indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. The "_A/H" denotes revision code "A" and packaging in 7-inch diameter plastic tape-and-reel (1500 units per reel). This suffix confirms full compliance with automotive material and reliability standards - distinct from non-HM3 variants that lack qualification or halogen-free status.

Can TPC27AHM3_A/H replace older TPC27A parts in existing designs?

Yes, the TPC27AHM3_A/H is a drop-in replacement for earlier TPC27A versions in the same TO-277A package, provided the design accounts for the HM3-specific qualifications. Electrically identical, it adds halogen-free content, RoHS compliance, and AEC-Q101 certification - making it suitable for new automotive designs and backward-compatible in legacy layouts where those attributes are not required.