Taiwan Semiconductor Corporation 1.5SMC7.5CAH

Overview

1.5SMC7.5CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with breakdown voltage 7.13–7.88 V at 10 mA test current, working stand-off voltage 6.40 V, clamping voltage 11.3 V at 500 A peak impulse current, and AEC-Q101 qualification for automotive-grade surge protection in power rails and I/O lines.

For engineers reviewing the 1.5SMC7.5CAH datasheet, 1.5SMC7.5CAH pinout, 1.5SMC7.5CAH application, or 1.5SMC7.5CAH equivalent, this part is selected for high-reliability ESD and lightning-induced transient suppression where bidirectional clamping, sub-1 ps response, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.

Technical Context

This TVS operates as a voltage-clamped shunt protector: under normal bias (≤6.40 V), leakage remains ≤1 µA; when transient exceeds breakdown (7.13–7.88 V), it avalanches to clamp voltage ≤11.3 V at 500 A, limiting energy delivered to downstream circuitry. Its glass-passivated junction ensures stable VBR temperature coefficient (0.061 %/°C) and long-term reliability.

Designed for bidirectional use, 1.5SMC7.5CAH has symmetrical electrical characteristics in both polarities-no anode/cathode orientation dependency-and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, enabling robust reflow assembly without popcorn risk.

Key Specifications

Pinout & Package

1.5SMC7.5CAH uses the DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads solderable per J-STD-002, polarity marked by cathode band (functionally irrelevant for bidirectional operation), weight ≈0.210 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ7.0CA and 1.5KE7.5CA, 1.5SMC7.5CAH uniquely balances 1500 W surge capacity, DO-214AB SMT compatibility, AEC-Q101 qualification, and bidirectional symmetry-making it optimal for automotive and industrial SMT production where reliability, power density, and process alignment are jointly critical.

Availability

1.5SMC7.5CAH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom line card surge suppression, and consumer USB port ESD hardening requiring stable component supply across high-volume production cycles.

Supply support for 1.5SMC7.5CAH 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-compliant product lines.

The 1.5SMC series was designed specifically for high-power, surface-mount transient suppression in automotive and industrial environments-emphasizing rugged packaging, fast response, and standardized SMC footprint for automated assembly.

FAQ

What does the "CAH" suffix indicate in 1.5SMC7.5CAH?

The "CAH" suffix denotes a bidirectional configuration with AEC-Q101 qualification. Unlike unidirectional "H" variants, 1.5SMC7.5CAH provides symmetrical clamping in both polarities-no anode/cathode distinction-and is tested to automotive reliability standards including temperature cycling, high-temperature operating life, and ESD robustness. This makes 1.5SMC7.5CAH suitable for AC-coupled or floating signal lines where polarity reversal may occur.

Is 1.5SMC7.5CAH compatible with lead-free reflow soldering?

Yes, 1.5SMC7.5CAH supports standard lead-free reflow profiles per J-STD-020 Level 1 (MSL-1), with peak temperatures up to 260 °C. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the UL 94V-0 molding compound withstands multiple reflow cycles without delamination or popcorn effect. The device's 150 °C maximum junction temperature further ensures thermal resilience during assembly.

How does 1.5SMC7.5CAH compare to unidirectional 1.5SMC7.5H in clamping performance?

1.5SMC7.5CAH and 1.5SMC7.5H share identical V_BR (7.13–7.88 V), V_C (11.3 V @ 500 A), and P_PK (1500 W) specifications-but 1.5SMC7.5CAH delivers those parameters in both directions, whereas 1.5SMC7.5H clamps only in reverse bias. In practice, 1.5SMC7.5CAH eliminates polarity-checking during placement and supports AC or differential signal protection without external diode pairing, simplifying layout and improving fault tolerance.

Does 1.5SMC7.5CAH meet ISO 7637-2 Pulse 5a (load dump)?

No-1.5SMC7.5CAH meets ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which requires sustained clamping at ≥40 V for up to 400 ms. Pulse 5a demands higher-energy TVS like 3 kW or specialized load-dump suppressors. 1.5SMC7.5CAH is rated for 1500 W peak pulse power (10/1000 µs), making it appropriate for fast transients-not prolonged overvoltages. For full ISO 7637-2 coverage, pair 1.5SMC7.5CAH with a dedicated load-dump protector.

What is the thermal resistance of 1.5SMC7.5CAH, and how does it affect power derating?

1.5SMC7.5CAH has R_θJA = 50 °C/W and R_θJC = 15 °C/W. At 25 °C ambient, its 1500 W peak rating applies only for 1 ms pulses; steady-state power dissipation is limited to 6.5 W. Derating follows Fig.2 in the datasheet: above 25 °C, allowable peak power decreases linearly-e.g., at 75 °C ambient, peak power drops to ~1000 W. PCB copper area and airflow significantly influence actual θ_JA, so thermal simulation or testing is recommended for high-duty-cycle applications.