Taiwan Semiconductor Corporation SMB10J24AH

Overview

SMB10J24AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 24V stand-off voltage (VWM), 26.7–29.5V breakdown voltage (VBR @ 1mA), and 38.9V clamping voltage (VC @ 25.7A). It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive switching protection.

For engineers reviewing the SMB10J24AH datasheet, SMB10J24AH pinout, SMB10J24AH application, or SMB10J24AH equivalent, key selection criteria include clamping performance under 10/1000μs transients, unidirectional polarity marking, DO-214AA thermal resistance (R_θJL = 20°C/W), and compliance with automotive ESD/EMC immunity standards.

Technical Context

The SMB10J24AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds VBR to clamp transients within nanosecond response time (<1.0ps). Its glass-passivated junction ensures stable leakage (<1µA @ 24V) and robust surge handling up to 100A IFSM (8.3ms half-sine).

Designed for automotive-grade reliability, it supports junction temperatures from –55°C to +175°C and achieves 1000W peak pulse power (t_p = 1ms) with derating above 25°C ambient per Fig. 2. Polarity is marked by cathode band; no bidirectional operation without CAH suffix.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, low-profile, matte tin-plated leads, polarity indicated by cathode band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ24A and 1.5SMC24A, the SMB10J24AH uniquely balances AEC-Q101 qualification, DO-214AA compactness, and 1000W clamping in a single-source automotive-qualified TVS-enabling drop-in replacement in legacy SMB-layout designs without thermal or layout redesign.

Availability

SMB10J24AH is available at Aetrix Electronics and suitable for automotive lighting systems, body control modules, industrial power supplies, and commercial vehicle telematics requiring stable component supply across extended temperature and high-reliability environments.

Supply support for SMB10J24AH 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, and automotive-qualified power devices.

The SMB10JxxAH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing low clamping voltage, fast response, and robust thermal performance in DO-214AA packaging.

FAQ

What is the maximum clamping voltage of SMB10J24AH under standard test conditions?

The SMB10J24AH has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 25.7 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events. The SMB10J24AH maintains this clamping performance across its full operating temperature range, making it suitable for under-hood applications where thermal stability is critical.

Is SMB10J24AH suitable for bidirectional transient protection?

No, SMB10J24AH is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection, the SMB10J24CAH variant must be used-identified by the "CAH" suffix and distinct marking code "LZC". The SMB10J24AH features a cathode band for polarity identification and conducts only in forward bias; reverse conduction is limited to clamping above VBR. Using SMB10J24AH in AC or bipolar signal paths may result in improper protection or device failure.

Does SMB10J24AH require special handling during PCB assembly?

No special handling is required beyond standard SMT practices. SMB10J24AH has Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions without baking. Its matte tin-plated leads are solderable per J-STD-002, and the DO-214AA package supports standard reflow profiles (peak 260°C, 20–40 sec). The device's glass passivation eliminates concerns about solder flux-induced degradation, and its R_θJL = 20°C/W allows direct thermal coupling to PCB copper without thermal vias in most 1000W pulse applications.

How does SMB10J24AH meet ISO 7637-2 requirements?

SMB10J24AH is validated to suppress all five ISO 7637-2 transient pulses: Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a/3b (capacitive coupled EFT). Its 1000W peak power rating, sub-1ps response time, and 38.9V clamping ensure protected circuits remain below safe voltage thresholds during these standardized automotive transients. Test reports per ISO 7637-2 are available upon request for SMB10J24AH with AEC-Q101 certification documentation.

What is the steady-state power dissipation rating for SMB10J24AH?

The SMB10J24AH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value reflects continuous DC or low-frequency power handling capability-not transient surge capacity. In practical design, PD governs thermal design for sustained reverse leakage or forward conduction scenarios. Because SMB10J24AH leakage is ≤1 µA at 24V, actual steady-state dissipation is negligible (<24 µW), allowing the device to operate well within its thermal limits even in high-temperature environments when properly mounted on adequate copper area.