Taiwan Semiconductor Corporation SMCJ16A

Overview

SMCJ16A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 16V working stand-off voltage (VWM), 17.8–19.7V breakdown voltage (VBR), and 26.0V maximum clamping voltage (VC) at 60A peak pulse current. It protects automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the SMCJ16A datasheet, SMCJ16A pinout, SMCJ16A application, or SMCJ16A equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, junction temperature derating above 25°C, unidirectional polarity marking, and compliance with automotive EFT immunity standards.

Technical Context

The SMCJ16A employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 µA at 16 V). Its single-die construction delivers precise clamping performance under 10/1000 µs surge waveforms per REA standards.

Thermal design relies on R_θJC = 10 °C/W and R_θJA = 55 °C/W, enabling 5 W steady-state dissipation at 25°C ambient. The device operates across –55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by band marking. Weight: 0.210 g. UL 94V-0 compliant molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ16A, SMCJ16A provides 2.5× higher surge power headroom for robust automotive front-end protection; versus 1.5SMC16A, it offers identical performance with different branding and supply chain origin-no design or layout changes required.

Availability

SMCJ16A is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC I/O modules, commercial LED driver systems, and HMI panels requiring stable component supply and long-term lifecycle support.

Supply support for SMCJ16A 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 for automotive, industrial, and consumer markets.

The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments, targeting ISO 7637-2 compliance and extended temperature operation up to +150°C junction.

FAQ

What is the clamping voltage of SMCJ16A at its rated peak pulse current?

The SMCJ16A has a maximum clamping voltage (VC) of 26.0 V at 60 A peak impulse current (IPPM), measured under the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ16A maintains this clamping performance consistently due to its glass-passivated junction and controlled doping profile.

Is SMCJ16A unidirectional or bidirectional, and how is polarity identified?

SMCJ16A is a unidirectional TVS diode, intended for DC line protection where reverse voltage is not expected. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line, and the anode connects to ground. Bidirectional variants use the "C" or "CA" suffix (e.g., SMCJ16CA); the SMCJ16A does not conduct in reverse bias beyond its specified leakage.

Does SMCJ16A meet automotive transient immunity standards?

Yes, SMCJ16A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load release), Pulse 2b (supply interruption), and Pulses 3a/3b (switching noise), as confirmed in Taiwan Semiconductor's official documentation. Its 1500 W peak power rating, fast <1.0 ps response, and stable clamping enable direct integration into automotive power distribution networks without supplemental filtering.

What is the thermal resistance and maximum steady-state power dissipation of SMCJ16A?

SMCJ16A has a junction-to-case thermal resistance (R_θJC) of 10 °C/W and junction-to-ambient resistance (R_θJA) of 55 °C/W. At 25°C ambient, its steady-state power dissipation (PD) is rated at 5 W. Derating is required above 25°C per Figure 2 in the datasheet; for example, at 75°C ambient, usable PD drops to approximately 2.7 W. Proper copper pour and thermal vias are recommended to maintain safe TJ.

How does SMCJ16A differ from SMCJ16 in terms of electrical performance?

SMCJ16A offers tighter breakdown voltage tolerance: 17.8–19.7 V (min/max) versus SMCJ16's wider 17.8–21.8 V range. This results in more predictable clamping onset and reduced variation in protected circuit stress. Both share identical VWM (16 V), VC (26.0 V vs. 28.8 V), PPK (1500 W), and package (DO-214AB). The "A" suffix denotes enhanced VBR uniformity for critical applications.