Taiwan Semiconductor Corporation 5.0SMDJ28A

Overview

5.0SMDJ28A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and I/O interfaces. It delivers 5000W peak pulse power at 10/1000μs, clamps transients to 45.4V at 110A, and features a 31.1–34.4V breakdown voltage with <1.0ps response time. Used in AC/DC power supplies and industrial control I/O protection.

For engineers reviewing the 5.0SMDJ28A datasheet, 5.0SMDJ28A pinout, 5.0SMDJ28A application, or 5.0SMDJ28A equivalent, key selection criteria include its DO-214AB (SMC) package, 28V working standoff voltage, 45.4V max clamping voltage at 110A, ±0.102 mV/°C VBR temperature coefficient, and UL 94V-0 molded case compliance.

Technical Context

The 5.0SMDJ28A employs a stacked-die construction in a unidirectional configuration, enabling robust single-polarity surge suppression without reverse conduction. Its photo-glass passivated junction ensures stable leakage performance (<2µA at 28V) and long-term reliability under repeated transient stress.

Thermal design is supported by a 16°C/W junction-to-lead resistance and 61°C/W junction-to-ambient rating on a 16mm × 16mm copper pad PCB layout. The device operates across –55°C to +175°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, cathode-indicated by band, matte tin-plated leads, 0.300g mass, UL 94V-0 compliant molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ28A and SMCJ28A, the 5.0SMDJ28A provides guaranteed 5000W surge capability in the DO-214AB footprint, whereas SMBJ28A lacks sufficient energy handling, and SMCJ28A matches it electrically but may differ in traceability or qualification documentation.

Availability

5.0SMDJ28A is available at Aetrix Electronics and suitable for industrial power input protection, PLC I/O hardening, motor drive control boards, and telecom power interfaces requiring stable component supply and full IEC 61000-4-5 compliance.

Supply support for 5.0SMDJ28A 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 bridge rectifiers for industrial and automotive markets.

The 5.0SMDJ28A belongs to TSC's high-power SMDJ series, engineered specifically for ruggedized surge protection in harsh-environment power systems where 5000W pulse handling and extended temperature operation are mandatory.

FAQ

What is the maximum clamping voltage of the 5.0SMDJ28A at its rated peak pulse current?

The 5.0SMDJ28A has a maximum clamping voltage (V_C) of 45.4 V when subjected to its rated peak pulse current (I_PP) of 110 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The 5.0SMDJ28A maintains this clamping performance across its full operating temperature range.

Is the 5.0SMDJ28A unidirectional or bidirectional, and how is polarity identified?

The 5.0SMDJ28A is a unidirectional TVS diode, meaning it clamps only positive-going transients relative to its cathode terminal. Polarity is indicated by a cathode band printed on the DO-214AB (SMC) package body. During PCB layout, the banded end must connect to the system ground or lower-potential reference node to ensure correct clamping behavior. The 5.0SMDJ28A does not conduct in reverse bias beyond its specified leakage current.

What is the working standoff voltage (V_WM) of the 5.0SMDJ28A, and why is it critical for circuit design?

The working standoff voltage (V_WM) of the 5.0SMDJ28A is 28 V - the maximum continuous DC or RMS voltage the device can withstand without entering avalanche conduction. This parameter is critical because it must exceed the normal operating voltage of the protected line (e.g., 24V DC systems) with sufficient margin to avoid leakage-induced power loss or thermal stress. Selecting a V_WM too close to operating voltage risks premature clamping and system instability.

Does the 5.0SMDJ28A meet RoHS and halogen-free compliance standards?

Yes, the 5.0SMDJ28A is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound is UL 94V-0 rated, and terminals are matte tin plated per J-STD-002 solderability standards. These certifications confirm suitability for environmentally regulated industrial and telecom applications. The 5.0SMDJ28A also meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for lead-free reflow assembly.

What thermal derating applies to the 5.0SMDJ28A above 25°C ambient temperature?

The 5.0SMDJ28A's peak pulse power capability remains constant up to 25°C, but its steady-state power dissipation (P_D) derates linearly above 25°C ambient, reaching 0 W at 175°C junction temperature. Derating follows the curve in Figure 2 of the datasheet, with R_θJA = 61°C/W on a 16 mm × 16 mm copper pad. For reliable long-term operation, keep the 5.0SMDJ28A's junction temperature below 175°C using adequate PCB copper area and airflow where applicable.