Taiwan Semiconductor Corporation 5.0SMDJ43A

Overview

5.0SMDJ43A 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 features a 43 V working standoff voltage, 47.8–52.8 V breakdown voltage at 1 mA, 72.1 A peak pulse current (10/1000 µs), 69.4 V maximum clamping voltage, and 5000 W peak pulse power dissipation.

For engineers reviewing the 5.0SMDJ43A datasheet, 5.0SMDJ43A pinout, 5.0SMDJ43A application, or 5.0SMDJ43A equivalent, key selection criteria include clamping performance under 10/1000 µs surges, thermal resistance (R_θJL = 16 °C/W), DO-214AB package compatibility with automated SMT assembly, and unidirectional polarity indicated by cathode band.

Technical Context

The 5.0SMDJ43A employs a stacked-die construction to achieve 5000 W peak pulse power handling while maintaining fast response (<1.0 ps) and low clamping ratio (VC/VBR ≈ 1.37). Its glass-passivated junction ensures stable leakage (<2 µA at 43 V) and robust ESD/EMI immunity across -55°C to +175°C operating range.

Designed for unidirectional DC line protection, it operates with 5 V forward voltage at 100 A and integrates JESD201 Class 2 whisker-resistant matte tin plating. Thermal performance is characterized on a 16 mm × 16 mm copper pad PCB, delivering R_θJA = 61 °C/W and R_θJC = 17 °C/W.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Weight: 0.300 g. Meets UL 94V-0 flammability and J-STD-020 moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ43A and 1.5SMC43A, the 5.0SMDJ43A delivers optimal balance of high-energy surge handling (5000 W), industry-standard DO-214AB footprint, and production-ready moisture sensitivity level 1 - making it preferred for industrial power and automotive I/O designs requiring repeatable, high-reliability transient suppression.

Availability

5.0SMDJ43A is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, automotive body control modules, and telecom remote radio units requiring stable component supply and long-term lifecycle support.

Supply support for 5.0SMDJ43A 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 5.0SMDJxxA series was developed to address high-power transient suppression needs in industrial and transportation systems, emphasizing ruggedized packaging, high-temperature reliability, and automated SMT compatibility.

FAQ

What is the maximum clamping voltage of the 5.0SMDJ43A under a 10/1000 µs surge?

The 5.0SMDJ43A has a maximum clamping voltage (V_C) of 69.4 V when subjected to its rated peak pulse current of 72.1 A using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and is measured per JEDEC test conditions. The 5.0SMDJ43A maintains this clamping performance without degradation after repeated surges within its specified limits.

Is the 5.0SMDJ43A suitable for bidirectional transient protection?

No, the 5.0SMDJ43A is a unidirectional TVS diode and is not rated for reverse standoff or clamping in the reverse direction. It must be used with correct polarity - cathode toward the protected line - and is intended for DC power rail or unidirectional signal line protection. For bidirectional applications, a dedicated bidirectional part such as 5.0SMDJ43CA must be selected instead of the 5.0SMDJ43A.

What is the thermal resistance from junction to ambient for the 5.0SMDJ43A?

The junction-to-ambient thermal resistance (R_θJA) of the 5.0SMDJ43A is 61 °C/W when mounted on a standard 16 mm × 16 mm copper pad PCB per JEDEC test conditions. This value assumes no additional heatsinking; actual R_θJA will improve with larger copper areas or internal layer planes. The 5.0SMDJ43A also specifies R_θJL = 16 °C/W and R_θJC = 17 °C/W for thermal modeling.

Does the 5.0SMDJ43A require moisture preconditioning before reflow soldering?

No, the 5.0SMDJ43A is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and does not require baking or dry-pack handling prior to standard lead-free reflow. This eliminates process steps and reduces risk of popcorning during assembly - a key advantage for high-volume SMT production of the 5.0SMDJ43A.

How does the 5.0SMDJ43A compare to the 5.0SMDJ40A in terms of clamping performance?

The 5.0SMDJ43A clamps at 69.4 V (72.1 A), while the 5.0SMDJ40A clamps at 64.5 V (77.6 A). Although the 5.0SMDJ40A has a lower clamping voltage, its 40 V working standoff makes it unsuitable for 43–48 V nominal systems. The 5.0SMDJ43A provides better system-level margin for 48 V DC applications by matching V_WM to common rail voltages while maintaining sub-70 V clamping - a critical design trade-off reflected in both parts' published 5.0SMDJ43A and 5.0SMDJ40A specifications.