Taiwan Semiconductor Corporation SMDJ58CAH

Overview

SMDJ58CAH from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 58V working stand-off voltage (VWM), 64.4–71.2V breakdown voltage (VBR), and 93.6V maximum clamping voltage (VC) at 32.1A peak pulse current. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.

For engineers reviewing the SMDJ58CAH datasheet, SMDJ58CAH pinout, SMDJ58CAH application, or SMDJ58CAH equivalent, key selection criteria include bidirectional clamping performance, 175°C junction temperature rating, UL 94V-0 molding compound, J-STD-020 Level 1 moisture sensitivity, and compliance with automotive transients per ISO 7637-2.

Technical Context

The SMDJ58CAH employs a glass-passivated silicon junction to achieve fast response time (<1.0 ps) and stable clamping under repetitive surge events. Its bidirectional configuration enables symmetrical protection of AC signal lines or differential buses without polarity concerns.

Designed for high-energy transient suppression, it delivers 3000W peak pulse power (10/1000 µs waveform) with thermal resistance R_θJA = 75°C/W and R_θJL = 15°C/W, supporting operation from –55°C to +175°C ambient and junction temperatures.

Key Specifications

Pinout & Package

DO-214AB (SMC) package with cathode band marking for unidirectional variants; SMDJ58CAH is bidirectional and marked "DGG" - terminals are non-polarized and function identically in both directions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SAC58CA, SMDJ58CAH offers double the peak power rating and full automotive qualification; versus SMCJ58CA, it provides equivalent protection with identical form factor but slightly higher thermal resistance - both are viable alternatives depending on sourcing and qualification needs.

Availability

SMDJ58CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial CAN networks, telecom power systems, and renewable energy controllers requiring stable component supply and long-term lifecycle support.

Supply support for SMDJ58CAH 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 SMDJ series was developed specifically for high-reliability, high-power transient suppression in harsh environments - emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in compact SMC packages.

FAQ

What does the "CAH" suffix indicate in SMDJ58CAH?

The "CAH" suffix denotes a bidirectional configuration - meaning the SMDJ58CAH functions identically in both polarities, unlike unidirectional "AH" variants. This allows symmetric clamping across AC lines or differential buses without regard to orientation during placement. The "C" stands for "Common Anode/Cathode" architecture, and "AH" indicates the DO-214AB (SMC) package and automotive-grade construction. SMDJ58CAH is fully specified for bidirectional use per its VBR min/max and VC values in both directions.

Is SMDJ58CAH suitable for protecting a 48 V telecom power supply?

Yes - SMDJ58CAH has a 58 V working stand-off voltage (VWM), making it appropriate for 48 V nominal DC systems where transient margins require clamping above steady-state voltage but below IC absolute maximum ratings. Its 93.6 V clamping voltage at 32.1 A ensures downstream 100 V-rated capacitors and 75 V-input DC/DC converters remain within safe operating limits during IEC 61000-4-5 surges. SMDJ58CAH is explicitly validated for telecom infrastructure per its ISO 7637-2 Pulse 3b and ESD immunity claims.

Does SMDJ58CAH require derating at elevated ambient temperatures?

Yes - SMDJ58CAH must be derated above 25°C ambient per its Pulse Derating Curve (Fig.2). At 85°C ambient, its 3000 W peak pulse power drops to approximately 1800 W, and at 125°C, it falls to ~1100 W. This is governed by thermal resistance R_θJA = 75°C/W and maximum junction temperature of 175°C. Layout practices such as increased copper area and thermal vias directly impact real-world derating - SMDJ58CAH's R_θJL = 15°C/W supports effective lead-to-PCB heat transfer when soldered correctly.

How does SMDJ58CAH compare to unidirectional SMDJ58AH in circuit implementation?

SMDJ58CAH eliminates polarity concerns - it can be placed across any two nodes needing bidirectional protection (e.g., CAN-H/CAN-L, RS-485 A/B, or AC signal lines) without orientation checks. In contrast, SMDJ58AH requires correct anode/cathode alignment relative to ground and supply, and only clamps in reverse bias. Both share identical VWM, VBR, and VC specs, but SMDJ58CAH's bidirectional symmetry simplifies layout and reduces assembly errors. SMDJ58CAH is not interchangeable with SMDJ58AH in unidirectional-only designs unless circuit topology supports symmetrical clamping.

What is the moisture sensitivity level (MSL) and reflow profile for SMDJ58CAH?

SMDJ58CAH is rated MSL Level 1 per J-STD-020 - meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking before standard Pb-free reflow (peak 260°C, 20–40 sec above 217°C). Its matte tin-plated leads comply with J-STD-002 for solderability, and the UL 94V-0 molding compound withstands multiple reflow cycles without delamination. This makes SMDJ58CAH ideal for high-volume automated placement in automotive and industrial manufacturing where process robustness is critical.