Taiwan Semiconductor Corporation 1V5KE9V1A

Overview

1V5KE9V1A from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge clamping in power and signal lines. It delivers 1500W peak pulse power at 1.0ms, has a breakdown voltage of 8.65–9.55V at 1mA test current, clamps to 13.4V at 112A peak pulse current, and operates within -55°C to +175°C junction temperature range - deployed in industrial power supply input protection.

For engineers reviewing the 1V5KE9V1A datasheet, 1V5KE9V1A pinout, 1V5KE9V1A application, or 1V5KE9V1A equivalent, key selection criteria include verified unidirectional clamping performance, DO-201 package thermal robustness, low incremental surge resistance, and compliance with IEC EFT immunity requirements for 24V control systems.

Technical Context

The 1V5KE9V1A uses a glass-passivated silicon junction to achieve fast response time (<1ns) and stable clamping under repetitive transients. Its unidirectional architecture enables asymmetric protection - reverse-biased during overvoltage events while presenting low leakage (<1μA at 7.78V VRWM) in normal operation.

Designed for 1ms 10/1000μs waveform compliance, it sustains 112A peak pulse current with 13.4V clamping voltage and exhibits <0.1Ω incremental surge resistance. Thermal design leverages DO-201's 0.090g mass and UL 94V-0 molding compound for reliable power dissipation up to 5W at 75°C ambient.

Key Specifications

Pinout & Package

Package: DO-201 - axial-leaded, glass-passivated plastic case rated UL 94V-0; cathode indicated by band; tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ9.0A and 1N6270A, the 1V5KE9V1A provides higher surge handling margin (1500W vs. 600W) and tighter VBR tolerance (±5% vs. ±10%), making it preferred for industrial-grade 24V systems requiring long-term reliability under repeated transients.

Availability

1V5KE9V1A is available at Aetrix Electronics and suitable for industrial PLC input protection, 24V DC power supply surge clamping, and automotive body control module (BCM) transient suppression requiring stable component supply and full traceability.

Supply support for 1V5KE9V1A 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 - headquartered in Hsinchu, Taiwan.

The 1V5KE9V1A belongs to TSC's 1500W unidirectional TVS family engineered for high-reliability industrial and automotive surge immunity, emphasizing stable clamping, low leakage, and extended thermal endurance.

FAQ

What is the maximum clamping voltage of the 1V5KE9V1A under standard test conditions?

The 1V5KE9V1A clamps to 13.4V at 112A peak pulse current (IPPM) under 10/1000μs waveform per IEC 61000-4-5. This value is measured at TA = 25°C with specified test setup and defines the upper voltage limit imposed on protected circuits during surge events. The 1V5KE9V1A maintains this clamping performance across its full operating temperature range.

Is the 1V5KE9V1A suitable for bidirectional transient protection?

No - the 1V5KE9V1A is a unidirectional TVS diode intended for DC line protection where polarity is fixed. For bidirectional applications (e.g., AC lines or data buses), the CA-suffixed variant 1V5KE9V1CA must be used. The 1V5KE9V1A's cathode band marking and asymmetric IV curve confirm its unidirectional functionality.

What is the reverse leakage current specification for the 1V5KE9V1A at its rated standoff voltage?

At VRWM = 7.78V and TA = 25°C, the 1V5KE9V1A exhibits reverse leakage current (IR) ≤1μA. This low leakage ensures minimal power loss and avoids false triggering in always-on 24V monitoring circuits. The 1V5KE9V1A maintains IR <5μA up to 85°C ambient per derating curves in the official datasheet.

Does the 1V5KE9V1A meet RoHS and halogen-free compliance standards?

Yes - the 1V5KE9V1A is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. This makes the 1V5KE9V1A acceptable for export to EU, Japan, and other regulated markets with strict environmental directives.

What is the recommended PCB layout practice for optimal thermal performance of the 1V5KE9V1A?

For optimal thermal performance, use ≥0.375" lead length per JEDEC standard, mount with minimum copper pour near leads to aid conduction cooling, and avoid excessive solder mask coverage on leads. The 1V5KE9V1A's DO-201 package achieves 5W power dissipation at 75°C ambient when leads are properly terminated - verify layout against TSC's thermal derating curve (Fig.5) for target operating temperatures.