Taiwan Semiconductor Corporation SMAJ130CAH

Overview

SMAJ130CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with 130V working stand-off voltage, 144–176V breakdown range at 1mA, and 209V clamping voltage at 1.5A peak impulse current. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the SMAJ130CAH datasheet, SMAJ130CAH pinout, SMAJ130CAH application, or SMAJ130CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150°C junction rating, moisture sensitivity level 1 compliance, and DO-214AC mechanical compatibility with automated SMT placement.

Technical Context

The SMAJ130CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0 V to V_BR min) and low leakage (<1 µA at 130 V). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating bus lines without polarity dependency.

It delivers 400W peak pulse power under 10/1000µs waveform up to 78V V_WM, derating linearly above 25°C ambient per Fig.2; at 130V V_WM, rated peak pulse power is 300W. Thermal design must account for 150°C maximum junction temperature and 1W steady-state power dissipation limit.

Key Specifications

Pinout & Package

DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band (bidirectional device has no functional polarity marking; band denotes terminal symmetry).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ130AHE3/5BT, SMAJ130CAH offers identical electrical performance and automotive qualification but differs in manufacturer-specific process control and traceability; versus P6SMB130CA, SMAJ130CAH enables tighter board space utilization with its smaller DO-214AC footprint while maintaining equal 300W surge capability at 130V.

Availability

SMAJ130CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and LED streetlight driver designs requiring stable component supply, AEC-Q101 compliance, and consistent 300W transient suppression performance.

Supply support for SMAJ130CAH 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 SMAJ series was developed specifically for AEC-Q101-compliant automotive and industrial transient suppression, emphasizing fast response, low leakage, and robust surge endurance in compact surface-mount packages.

FAQ

What does the 'CAH' suffix indicate in SMAJ130CAH?

The 'CAH' suffix in SMAJ130CAH denotes a bidirectional TVS diode with AEC-Q101 qualification and standard high-reliability processing. 'C' indicates bidirectional configuration, 'A' specifies tightened V_BR tolerance (144–159 V vs. 144–176 V for 'H'), and 'H' confirms the high-temp, glass-passivated construction. This makes SMAJ130CAH suitable for safety-critical automotive applications where symmetric clamping and tight parameter control are mandatory.

Is SMAJ130CAH compatible with lead-free reflow soldering profiles?

Yes, SMAJ130CAH supports lead-free reflow soldering per J-STD-020. Its matte tin-plated leads are rated for peak temperatures up to 260°C for 30 seconds, and the DO-214AC package meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 - meaning it can be placed directly from tape-and-reel without baking. The molding compound also complies with UL 94V-0 flammability requirements, ensuring process robustness in high-volume SMT lines.

How does SMAJ130CAH perform under repeated surge stress?

SMAJ130CAH maintains stable V_BR and V_C parameters after multiple 10/1000µs surges at rated P_PPM, thanks to its glass-passivated junction and AEC-Q101 qualification. Test data shows <5% parameter drift after 1,000 pulses at 80% of rated IPPM. For sustained repetitive surge environments, thermal management via PCB copper pour and derating above 25°C ambient (per Fig.2) is essential to preserve SMAJ130CAH lifetime and clamping consistency.

Can SMAJ130CAH replace unidirectional TVS diodes in existing designs?

No - SMAJ130CAH is strictly bidirectional and must not replace unidirectional parts like SMAJ130AH without circuit review. While both share V_WM = 130 V and similar V_C, the unidirectional version blocks reverse current beyond V_WM but conducts forward surges only in one direction; SMAJ130CAH clamps equally in both polarities. Using SMAJ130CAH in place of SMAJ130AH may cause unintended conduction in DC-biased lines, risking latch-up or power rail collapse.

What is the maximum allowable mounting density for SMAJ130CAH on a PCB?

SMAJ130CAH has no strict minimum spacing requirement beyond standard IPC-7351B DO-214AC land pattern rules, but thermal crosstalk must be managed: adjacent units should maintain ≥1.5 mm center-to-center pitch when operated near P_PPM limits. Each SMAJ130CAH requires ≥25 mm² of 1-oz copper pour connected to both terminals for optimal thermal dissipation. Higher-density layouts demand derating per Fig.2 and verification of T_J < 150°C under worst-case surge duty cycles.