Taiwan Semiconductor Corporation 1.5KE8.2

Overview

1.5KE8.2 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 8.2V, minimum/maximum V_BR of 7.38V/9.02V at 10mA, clamping voltage of 12.5V at 200A peak pulse current, and DO-201 axial package - used in automotive ECU power input stages to absorb ISO 7637-2 Pulse 1/2a/3b transients.

For engineers reviewing the 1.5KE8.2 datasheet, 1.5KE8.2 pinout, 1.5KE8.2 application, or 1.5KE8.2 equivalent, key selection criteria include its 12.5V clamping performance at 200A, 6.63V working stand-off voltage, <1μA leakage above 10V, AEC-Q101 qualification option (1.5KE8.2A), and compatibility with lead-free reflow per J-STD-002.

Technical Context

The 1.5KE8.2 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its specified V_BR range (7.38–9.02V). Its low dynamic impedance enables rapid clamping response (<1.0ps from 0V to V_BR) and limits voltage overshoot during 10/1000μs surge events.

It sustains 1500W non-repetitive peak pulse power at T_A = 25°C, derating linearly above that ambient temperature, and handles up to 200A peak impulse current (I_PP) while maintaining V_C ≤ 12.5V - critical for protecting downstream 5V/3.3V logic from load dump or inductive switching spikes.

Key Specifications

Pinout & Package

Package: DO-201 axial leaded package with cathode band marking; body length 7.11mm ±0.25mm, diameter 5.21mm ±0.25mm; pure 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 voltage suppression applications.

Compared with SMBJ8.0A, the 1.5KE8.2 delivers 2.5× higher surge power handling and axial-leaded mechanical robustness; compared with 1.5KE8.2A, it lacks AEC-Q101 certification but offers identical clamping performance and cost advantage for industrial use.

Availability

1.5KE8.2 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, LED driver overvoltage clamp, and ESD-sensitive sensor interface requiring stable component supply and long-term obsolescence management.

Supply support for 1.5KE8.2 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 1.5KE series was developed to deliver high-energy transient suppression in ruggedized axial packages for harsh-environment applications - particularly targeting ISO 7637-2 compliance in automotive electronics and industrial control systems.

FAQ

What is the clamping voltage of the 1.5KE8.2 under standard test conditions?

The 1.5KE8.2 exhibits a maximum clamping voltage (V_C) of 12.5V when subjected to a 10/1000μs surge waveform with a peak current (I_PP) of 200A. This value is measured per JEDEC standards and represents the upper voltage limit imposed on the protected circuit during worst-case transient events - critical for ensuring compatibility with 5V or 3.3V logic interfaces downstream of the 1.5KE8.2.

Is the 1.5KE8.2 unidirectional or bidirectional, and how is polarity marked?

The 1.5KE8.2 is a unidirectional TVS diode, intended for DC line protection where reverse voltage is not expected. Polarity is indicated by a cathode band on the DO-201 package body - the banded end connects to the protected line, while the anode connects to ground. Bidirectional variants (e.g., 1.5KE8.2C) exist but are distinct part numbers; the 1.5KE8.2 itself is strictly unidirectional.

Does the 1.5KE8.2 meet automotive qualification standards?

The base 1.5KE8.2 is not AEC-Q101 qualified; however, its direct variant 1.5KE8.2A is fully AEC-Q101 qualified and shares identical electrical specifications. The 1.5KE8.2A undergoes extended stress testing including temperature cycling, humidity bias HAST, and ESD qualification - making it suitable for automotive powertrain, body control, and ADAS modules where component reliability is mandated.

What is the maximum steady-state power dissipation for the 1.5KE8.2?

The 1.5KE8.2 has a steady-state power dissipation (P_D) rating of 5W when mounted on a 0.6" × 0.6" copper pad at lead temperature (T_L) = 75°C. This value applies only to continuous DC or low-frequency conditions - not surge events. For transient suppression, the device relies on its 1500W peak pulse rating, which is non-repetitive and subject to thermal derating above 25°C ambient.

How does the 1.5KE8.2 compare to the 1.5KE8.2A in terms of physical and electrical compatibility?

The 1.5KE8.2 and 1.5KE8.2A share identical DO-201 packaging, pinout, V_BR, V_WM, V_C, and surge ratings - they are electrically and mechanically interchangeable. The sole difference is AEC-Q101 qualification and green compound material in the 1.5KE8.2A. No PCB or schematic changes are needed when upgrading from 1.5KE8.2 to 1.5KE8.2A, though documentation and traceability requirements differ for automotive programs.