Taiwan Semiconductor Corporation 1.5KE7.5CA

Overview

1.5KE7.5CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, with 7.5V nominal breakdown voltage, 6.05V working stand-off voltage, and 11.3V maximum clamping voltage at 500A peak impulse current. It protects automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the 1.5KE7.5CA datasheet, 1.5KE7.5CA pinout, 1.5KE7.5CA application, or 1.5KE7.5CA equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101 qualification status, thermal derating curves, and direct alternative part comparisons for ESD and surge protection design.

Technical Context

The 1.5KE7.5CA operates as a bidirectional avalanche diode, symmetrically clamping voltage surges in both polarities with identical V_BR min/max (7.13–7.88 V) and V_C (11.3 V) at I_PP = 500 A under 10/1000 μs waveform. Its low dynamic impedance ensures rapid energy diversion during fast transients.

It meets ISO 7637-2 immunity requirements for automotive electronics and supports steady-state power dissipation of 5 W at T_L = 75°C on 16 mm × 16 mm copper pad. Junction temperature range is –55°C to +175°C, enabling operation in under-hood and industrial control environments.

Key Specifications

Pinout & Package

DO-201 package: axial-leaded, cylindrical body with cathode band marking for unidirectional variants; 1.5KE7.5CA is bidirectional and has no polarity marking-both terminals are functionally identical.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1.5KE7.5CA, SMBJ7.0CA trades surge robustness for compactness, while 1.5SMC7.0CA matches power handling but demands SMT process adaptation-neither is pin-compatible, and all three require distinct mounting and thermal management strategies.

Availability

1.5KE7.5CA is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, LED driver surge suppression, and medical equipment ESD interface shielding requiring stable component supply across multi-year production cycles.

Supply support for 1.5KE7.5CA 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, serving global automotive, industrial, and consumer markets since 1979.

The 1.5KE series was developed specifically for high-energy transient suppression in harsh-environment applications, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust DO-201 packaging for under-hood and factory-floor deployment.

FAQ

What does the 'CA' suffix indicate in 1.5KE7.5CA?

The 'CA' suffix in 1.5KE7.5CA denotes bidirectional configuration-meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., 1.5KE7.5A), the 1.5KE7.5CA has no cathode marking and functions identically regardless of terminal orientation. This makes it ideal for AC-coupled lines or DC systems subject to reverse-polarity faults. The 1.5KE7.5CA maintains identical V_BR and V_C specifications in both directions per Taiwan Semiconductor's O2104 datasheet.

Is 1.5KE7.5CA AEC-Q101 qualified?

Yes, 1.5KE7.5CA is AEC-Q101 qualified when ordered with the 'H' suffix (e.g., 1.5KE7.5CAH). The base 1.5KE7.5CA part meets all electrical and mechanical specifications of the AEC-Q101 standard-including temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge (ESD) robustness-but formal qualification documentation applies only to the 'H'-suffixed variant. For automotive safety-critical designs, specify 1.5KE7.5CAH to ensure full audit-ready compliance and PPAP support.

What is the maximum clamping voltage of 1.5KE7.5CA at rated surge current?

The maximum clamping voltage (V_C) of 1.5KE7.5CA is 11.3 V at 500 A peak impulse current under the standard 10/1000 μs double-exponential waveform. This value is measured per JEDEC test conditions and guarantees that downstream circuitry sees no more than 11.3 V during worst-case transient events. It is derived from the device's low dynamic impedance and avalanche characteristics, and remains stable across its –55°C to +175°C operating junction temperature range.

How does 1.5KE7.5CA compare to 1.5KE7.5A in terms of circuit application?

The 1.5KE7.5CA is bidirectional and used where transients may occur with either polarity-such as across AC power inputs, differential data lines, or floating DC buses. In contrast, 1.5KE7.5A is unidirectional and must be oriented with its cathode toward the protected line's positive rail; it offers slightly lower V_C (11.7 V vs. 11.3 V) but cannot suppress negative-going surges. Select 1.5KE7.5CA when polarity is undefined or variable; use 1.5KE7.5A only in fixed-polarity DC circuits where space or cost favors unidirectional optimization.

What thermal derating applies to 1.5KE7.5CA above 25°C ambient?

1.5KE7.5CA follows the standard JEDEC derating curve: peak pulse power drops linearly from 1500 W at 25°C ambient to zero at 175°C junction temperature. At 75°C ambient, the device sustains 5 W steady-state power dissipation when mounted on a 16 mm × 16 mm copper pad. Derating is defined in Figure 2 of the O2104 datasheet and must be applied for continuous surge repetition or elevated ambient conditions. No external heatsink is required for single-event protection, but PCB copper area must meet minimum thermal relief guidelines to avoid exceeding T_J(max) = +175°C.