Taiwan Semiconductor Corporation 1.5KE75

Overview

1.5KE75 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, with nominal breakdown voltage 75V, minimum V_BR = 67.5V at 1.0mA test current, maximum clamping voltage V_C = 108V at 14A peak impulse current, and working stand-off voltage V_WM = 60.7V - designed for automotive and industrial power rail protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the 1.5KE75 datasheet, 1.5KE75 pinout, 1.5KE75 application, or 1.5KE75 equivalent, this part delivers verified 1500W surge capability at 10/1000μs waveform, <1.0ps response time from 0V to V_BR, low dynamic impedance, and AEC-Q101 qualification - critical for ESD and inductive switching transient suppression in 12V/24V systems.

Technical Context

The 1.5KE75 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 67.5–82.5V breakdown range, clamping transients to ≤108V at 14A. Its junction temperature rating of –55°C to +175°C supports under-hood automotive deployment without derating up to 75°C ambient.

It features pure tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 molding compound, and meets JESD201 Class 2 whisker resistance. Polarity is marked by cathode band; bidirectional variants use "C" or "CA" suffixes - not applicable to 1.5KE75.

Key Specifications

Pinout & Package

Package: DO-201 axial leaded case with cathode band marking; molded in UL 94V-0 flame-retardant compound; weight ≈ 0.090g; lead finish: pure tin, solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ75A, the 1.5KE75 offers 3.75× higher surge power (1500W vs. 400W) and axial-leaded DO-201 robustness for high-energy transients; compared with 1.5KE75A, it trades tighter V_BR control for broader availability and cost efficiency in non-critical clamping applications.

Availability

1.5KE75 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input stages, LED driver overvoltage clamping, and telecom power interface protection requiring stable component supply across production lifecycles.

Supply support for 1.5KE75 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, and power devices since 1979.

The 1.5KE series was engineered specifically for high-reliability automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, high-temperature stability, and standardized DO-201 form factor for legacy and new-design compatibility.

FAQ

What is the breakdown voltage range of the 1.5KE75?

The 1.5KE75 has a guaranteed breakdown voltage range of 67.5V to 82.5V at 1.0mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots and temperature extremes, making the 1.5KE75 suitable for precise overvoltage protection in 12V and 24V systems where clamping predictability is critical.

Is the 1.5KE75 unidirectional or bidirectional?

1.5KE75 is a unidirectional TVS diode, indicated by absence of "C" or "CA" suffix and explicit specification of cathode band marking. It conducts only in reverse bias during transients and blocks forward current - unlike bidirectional types such as 1.5KE75C, which protect AC lines or differential signals. The 1.5KE75 datasheet confirms polarity marking and specifies forward voltage (V_F = 3.5V @ 50A) only for unidirectional operation.

Does the 1.5KE75 meet AEC-Q101 reliability standards?

Yes, the 1.5KE75 is AEC-Q101 qualified, as confirmed in the product series documentation. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock - validating its suitability for automotive under-hood applications. Note that AEC-Q101 compliance applies to the full 1.5KE series, including 1.5KE75, and is not limited to "H"-suffixed variants.

What is the maximum clamping voltage of the 1.5KE75 during a surge event?

The 1.5KE75 clamps to a maximum of 108V at 14A peak impulse current (I_PP) under the standard 10/1000μs waveform. This value is measured per JEDEC test conditions and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events - a key parameter for ensuring protected ICs remain within absolute maximum ratings.

Can the 1.5KE75 be used in place of the 1.5KE75A variant?

Yes, the 1.5KE75 can serve as a functional alternative to 1.5KE75A in most applications, though with trade-offs: 1.5KE75 has wider V_BR tolerance (67.5–82.5V vs. 71.3–78.8V) and slightly higher clamping voltage (108V vs. 103V). Both share identical DO-201 package, pinout, and thermal specs. Use 1.5KE75 where cost or legacy design constraints prioritize broad availability over tight voltage control.