Vishay General Semiconductor - Diodes Division 60CTQ045

Overview

60CTQ045 from Vishay is a dual common-cathode Schottky rectifier in TO-220AB package, rated 45 V reverse voltage and 2 × 30 A average forward current per leg, with 0.53 V forward voltage at 30 A and 125 °C junction temperature; used in high-efficiency DC/DC converters and reverse battery protection circuits.

For engineers reviewing the 60CTQ045 datasheet, 60CTQ045 pinout, 60CTQ045 application, or 60CTQ045 equivalent, key selection criteria include thermal resistance (1.2 °C/W per leg), surge current capability (1500 A peak), low leakage at 150 °C, and center-tap configuration for dual-output power supplies.

Technical Context

This device integrates two independent Schottky diodes sharing a common cathode terminal, enabling synchronous rectification or dual-leg freewheeling in half-bridge and full-bridge topologies. Its proprietary barrier technology ensures stable operation up to 150 °C junction temperature with low IRM (250 mA max at 125 °C, 45 V).

The TO-220AB package features a metal tab electrically connected to the common cathode, supporting direct heatsink mounting. Thermal impedance ZthJC is specified at 1.2 °C/W per leg under DC conditions, and dV/dt rating reaches 10,000 V/µs - critical for fast-switching SMPS designs.

Key Specifications

Pinout & Package

TO-220AB package with isolated mounting tab; pin 1 = Anode 1, pin 2 = Common Cathode (electrically connected to metal tab), pin 3 = Anode 2. Tab must be insulated if not tied to cathode potential.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with VS-60CPH045, the 60CTQ045 offers lower cost and TO-220AB compatibility but sacrifices ~25% thermal headroom; versus MURB6045CT, it delivers ~58% lower conduction loss yet trades off leakage control above 125 °C.

Availability

60CTQ045 is available at Aetrix Electronics and suitable for switching power supplies, reverse battery protection circuits, dual-output DC/DC converters, and motor drive freewheeling applications requiring stable component supply across industrial and automotive production cycles.

Supply support for 60CTQ045 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

Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power rectification and high-reliability packaging.

The 60CTQ045 belongs to Vishay's High Power Products Schottky rectifier family, engineered for high-current, high-temperature industrial power conversion where low VF and rugged surge tolerance are mandatory.

FAQ

What is the maximum junction temperature rating for the 60CTQ045?

The 60CTQ045 is rated for continuous operation up to 150 °C junction temperature, validated per Vishay's industrial qualification standards. This rating is enabled by proprietary barrier technology and high-purity epoxy encapsulation. Derating curves in the datasheet (Fig. 5) define allowable case temperature vs. forward current to maintain TJ ≤ 150 °C. The 60CTQ045 must be mounted on an adequately sized heatsink with thermal interface material to achieve this limit in real-world applications.

Is the metal tab of the 60CTQ045 electrically isolated?

No, the metal tab of the 60CTQ045 is not electrically isolated - it is internally connected to Pin 2 (common cathode). This design enables low-inductance, low-resistance thermal transfer to the heatsink but requires electrical insulation (e.g., mica washer or insulating pad) if the heatsink is grounded or held at a different potential. Failure to insulate may cause short circuits in common-cathode configurations where the heatsink is referenced to system ground.

What does "CT" signify in the 60CTQ045 part number?

In the 60CTQ045 ordering code, "CT" stands for "Common Cathode" - indicating the internal configuration of two Schottky diodes sharing a single cathode terminal (Pin 2). This differs from "CA" (common anode) or single-diode variants. The "CT" designation directly maps to the pinout: Pins 1 and 3 are independent anodes, and Pin 2 serves as the shared cathode output, enabling dual-leg operation in bridge or dual-output topologies.

How does the 60CTQ045 compare to standard silicon rectifiers in terms of forward voltage?

The 60CTQ045 exhibits a typical forward voltage of 0.53 V at 30 A and 125 °C - approximately 57% lower than equivalent-rated silicon rectifiers (e.g., ~1.25 V for MURB6045CT). This reduction directly lowers conduction losses, improving power supply efficiency by 0.8–1.5% depending on load profile and topology. However, the trade-off is higher reverse leakage current, especially above 100 °C, which must be evaluated in high-temperature reverse-bias applications.

Can the 60CTQ045 be used in place of the 60CTQ060?

No, the 60CTQ045 is not a direct replacement for the 60CTQ060 due to its lower 45 V reverse voltage rating versus the 60CTQ060's 60 V rating. Substituting the 60CTQ045 in a 60 V design risks catastrophic failure during transient overvoltage events. While both share identical package, pinout, and current ratings, the 60CTQ045 must only be used in applications where maximum applied reverse voltage remains ≤45 V, such as 36 V automotive systems or 24 V industrial rails with controlled transients.