Taiwan Semiconductor Corporation SMCJ11AH

Overview

SMCJ11AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 11V working stand-off voltage (VWM), 12.2–13.5V breakdown voltage (VBR), and 18.2V maximum clamping voltage (VC) at 86A peak pulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the SMCJ11AH datasheet, SMCJ11AH pinout, SMCJ11AH application, or SMCJ11AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance values (RθJA = 55°C/W), moisture sensitivity level (MSL 1), and precise clamping performance under standardized 10/1000μs surge waveforms.

Technical Context

The SMCJ11AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its VBR range (12.2–13.5V at 1mA test current). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1μA at 11V), while fast response time (<1.0ps) enables effective suppression of ESD and load-switching spikes before sensitive downstream circuitry is damaged.

Thermally, it features RθJC = 10°C/W and RθJA = 55°C/W, supporting reliable 1500W peak pulse dissipation (tp = 1ms) with derating above 25°C ambient per Fig.2. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability PCB mounting.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case material is UL 94V-0 compliant molding compound; terminals are matte tin-plated leads, solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ11A and 1.5SMC11A, the SMCJ11AH delivers superior automotive-grade reliability (AEC-Q101), tighter leakage control (<1μA), and identical mechanical footprint with guaranteed ISO 7637-2 compliance - making it the preferred choice for functional safety–aware 12V system designs.

Availability

SMCJ11AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, and telecom power interface circuits requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for SMCJ11AH 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 automotive-qualified components.

The SMCJ series is part of TSC's AEC-Q101-certified transient suppression portfolio, engineered specifically for robust protection of 12V/24V automotive and industrial power systems against ISO 7637-2 and IEC 61000-4-2 threats.

FAQ

What is the clamping voltage of the SMCJ11AH under maximum rated surge current?

The SMCJ11AH has a maximum clamping voltage (VC) of 18.2 V when subjected to its rated peak pulse current (IPPM) of 86 A under the standardized 10/1000 μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ11AH maintains this clamping performance consistently due to its glass-passivated junction and controlled avalanche characteristics.

Is the SMCJ11AH suitable for automotive applications?

Yes, the SMCJ11AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards - making it suitable for engine control units, body electronics, and infotainment power supplies. Its MSL 1 rating, JESD201 Class 2 whisker resistance, and -55°C to +150°C operating range further confirm its readiness for automotive deployment. The SMCJ11AH is designed for these conditions from wafer fabrication through final test.

What is the difference between SMCJ11AH and SMCJ11H?

The SMCJ11AH offers tighter breakdown voltage tolerance (12.2–13.5 V) versus SMCJ11H (12.2–14.9 V), resulting in more predictable clamping onset and lower maximum clamping voltage (18.2 V vs. 20.1 V at same IPPM). Both share the same DO-214AB package, 1500W rating, and AEC-Q101 qualification, but the 'A' suffix denotes enhanced VBR uniformity - critical for designs requiring precise overvoltage threshold control. The SMCJ11AH achieves this via tighter process control during wafer sort and final test.

Does the SMCJ11AH have polarity marking, and how is it identified?

Yes, the SMCJ11AH uses a cathode band marking on the DO-214AB body to indicate polarity - consistent with unidirectional TVS diode convention. The band aligns with the cathode terminal, which must be connected toward the line being protected (e.g., 12V rail), while the anode connects to ground. This marking is visible under standard optical inspection and matches the polarity diagram in TSC's package outline drawing (Version A2102, Page 7). The SMCJ11AH's marking code is 'GDZ' per its ordering table.

What is the thermal resistance profile of the SMCJ11AH, and how does it affect PCB layout?

The SMCJ11AH has RθJC = 10°C/W and RθJA = 55°C/W (measured on standard JEDEC 2S2P test board). These values require adequate copper pour on both sides of the PCB connected to the anode and cathode pads to sustain 1500W peak pulses without exceeding TJ(max) = 150°C. Layout best practice includes ≥25 mm² of 2-oz copper per terminal and thermal vias under the pad. The SMCJ11AH's thermal specs are validated per JESD51-2 and directly impact sustained surge repetition rate in real-world applications.