Taiwan Semiconductor Corporation SMDJ10A

Overview

SMDJ10A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 10V working stand-off voltage (VWM), 11.1–12.3V breakdown voltage (VBR), and 17.0V clamping voltage (VC) at 176.5A peak pulse current. It features DO-214AB (SMC) packaging, glass passivated junction, and is designed for ESD and lightning-induced surge protection in DC power rails of industrial control systems.

For engineers reviewing the SMDJ10A datasheet, SMDJ10A pinout, SMDJ10A application, or SMDJ10A equivalent, key selection criteria include clamping performance under 10/1000µs transients, thermal resistance (R_θJA = 75°C/W), unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.

Technical Context

The SMDJ10A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 11.1V minimum breakdown threshold. Its fast response time (<1.0ps) enables suppression of sub-nanosecond ESD events, while its 3000W peak pulse power rating (t_p = 1ms) supports high-energy transients per IEC 61000-4-5.

Thermally, it sustains junction temperatures from –55°C to +175°C, with R_θJL = 15°C/W enabling effective heat transfer to PCB copper. The device uses a single-die configuration in DO-214AB package, with matte tin-plated leads compliant to J-STD-002 solderability and JESD 201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SAC10 and 1.5KE10A, the SMDJ10A delivers superior surge energy handling in a fully SMT-compatible footprint, with verified ISO 7637-2 compliance and industry-standard moisture sensitivity level 1-making it optimal for high-volume industrial and automotive electronics requiring zero reflow risk and repeatable clamping performance.

Availability

SMDJ10A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer AC-DC adapter outputs requiring stable component supply and full compliance with international surge immunity standards.

Supply support for SMDJ10A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.

The SMDJ10A belongs to TSC's SMDJ series of high-power surface-mount TVS diodes, engineered specifically for robust transient immunity in harsh industrial and automotive environments where space-constrained SMT layouts demand high energy density and certified surge resilience.

FAQ

What is the clamping voltage of the SMDJ10A under a standard 10/1000µs surge waveform?

The SMDJ10A has a maximum clamping voltage (VC) of 17.0 V when subjected to a 176.5 A peak pulse current with a 10/1000µs waveform. This value is measured per IEC 61000-4-5 test conditions and guarantees that downstream circuitry remains below critical overvoltage thresholds during real-world transients. The SMDJ10A maintains this clamping performance across its full operating temperature range.

Is the SMDJ10A suitable for bidirectional transient protection?

No, the SMDJ10A is unidirectional and intended for DC line protection where polarity is fixed. For bidirectional applications such as AC lines or data buses, the SMDJ10CA variant must be used instead. The SMDJ10A features a cathode band marking and conducts only in reverse bias; using it in bidirectional configurations risks failure during positive half-cycles.

What is the maximum steady-state power dissipation of the SMDJ10A at 25°C ambient?

The SMDJ10A has a steady-state power dissipation (PD) rating of 6.5 W at TA = 25°C. This value reflects continuous DC power handling capability-not surge-related-and is limited by thermal resistance (R_θJA = 75°C/W). In practice, the SMDJ10A is not operated continuously at PD; it functions intermittently during transient events, making its 3000W peak rating the dominant design parameter.

Does the SMDJ10A meet automotive surge immunity standards?

Yes, the SMDJ10A meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b-covering load dump, alternator ripple, and inductive switching transients common in 12V/24V vehicle electrical systems. Its 3000W peak power rating and 17.0V clamping voltage ensure compliance without external derating, making the SMDJ10A appropriate for body control modules and infotainment power supplies.

What is the moisture sensitivity level (MSL) of the SMDJ10A, and how does it affect manufacturing?

The SMDJ10A has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and subjected to standard SMT reflow profiles without pre-baking. This eliminates handling constraints and reduces production risk-unlike MSL 3+ components-making the SMDJ10A ideal for high-throughput automated assembly lines serving industrial and automotive customers.