Vishay General Semiconductor - Diodes Division 30CTQ035

Overview

30CTQ035 from Vishay is a center-tap common-cathode dual Schottky rectifier rated for 30 A average forward current (2 × 15 A per leg), 35 V maximum DC reverse voltage, and operation up to 175 °C junction temperature. It features low forward voltage drop (0.56 V at 15 A, 125 °C), 900 pF junction capacitance per leg, and TO-220AB package with metal tab for heatsinking - used in high-efficiency switching power supplies and reverse battery protection circuits.

For engineers reviewing the 30CTQ035 datasheet, 30CTQ035 pinout, 30CTQ035 application, or 30CTQ035 equivalent, key selection criteria include its dual-leg thermal resistance (3.25 °C/W per leg), surge rating (1060 A IFSM), low VF at elevated temperature, and industrial-grade qualification for harsh-environment power conversion.

Technical Context

This device implements a monolithic center-tapped Schottky structure with guard ring protection and high-purity epoxy encapsulation. Its barrier technology enables stable 175 °C TJ operation while maintaining low VF and moderate IR across temperature.

Each of the two anode terminals shares a common cathode terminal and operates independently with matched electrical characteristics. The TO-220AB package provides direct thermal path from die to heatsink via the metal tab, supporting high-current DC and pulsed operation without derating beyond specified thermal limits.

Key Specifications

Pinout & Package

Package: TO-220AB, center-tap configuration with isolated metal tab (electrically connected to cathode). Mounting torque: 6–12 kgf·cm (5–10 lbf·in).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-30CPH035 and MBR3035CT, the 30CTQ035 delivers superior thermal performance per leg (3.25 °C/W vs. ~3.8 °C/W) and lowest VF at elevated temperature - critical for space-constrained, high-ambient industrial converters requiring minimal heatsink area.

Availability

30CTQ035 is available at Aetrix Electronics and suitable for switching power supplies, reverse battery protection circuits, and DC-DC converter designs requiring stable component supply with industrial temperature range and high surge immunity.

Supply support for 30CTQ035 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, passive elements, and sensors, with leadership in power rectification and high-reliability packaging.

The 30CTQ... Series was developed for high-efficiency, high-temperature industrial power conversion - targeting applications where low VF, ruggedness, and extended thermal operation are mandatory design requirements.

FAQ

What is the maximum junction temperature rating for the 30CTQ035?

The 30CTQ035 has a maximum junction temperature (TJ) rating of 175 °C, verified per Vishay's industrial qualification standards. This allows continuous operation in high-ambient environments such as enclosed power supplies or automotive engine compartments. The 30CTQ035 maintains specified electrical parameters up to this limit, with thermal derating governed by RthJC = 3.25 °C/W per leg.

Is the 30CTQ035 pin-compatible with other TO-220AB dual Schottky rectifiers?

Yes, the 30CTQ035 uses standard TO-220AB mechanical dimensions and pinout (Anode–Cathode–Anode), matching industry-standard footprints. However, electrical compatibility depends on VR, IF(AV), and VF - for example, MBR3035CT shares the same pinout but exhibits higher VF at 125 °C. Always verify thermal and surge ratings before substitution.

Does the 30CTQ035 require a heatsink in typical 30 A operation?

Yes - at 30 A average current, the 30CTQ035 dissipates significant power (≈16.8 W at 0.56 V VF). With RthJC = 3.25 °C/W per leg and ambient constraints, a heatsink is required to maintain TJ ≤ 175 °C. The metal tab is electrically connected to the common cathode, so insulated mounting hardware is needed if the heatsink is grounded.

What is the reverse leakage current specification for the 30CTQ035 at 125 °C?

At 125 °C and rated 35 V reverse voltage, the 30CTQ035 specifies a maximum reverse leakage current (IRM) of 15 mA per leg. This value reflects moderate leakage typical of high-current Schottky devices optimized for low VF, and remains within acceptable limits for most industrial power supply designs operating below 85 °C ambient.

Can the 30CTQ035 be used in synchronous rectification topologies?

No - the 30CTQ035 is a passive Schottky rectifier, not a synchronous MOSFET controller or driver. It functions as a unidirectional conduction device only. For synchronous rectification, discrete MOSFETs with gate drive circuitry or integrated synchronous rectifier ICs (e.g., Vishay SiHP series) are required; the 30CTQ035 serves instead as the freewheeling or output rectification element in non-synchronous topologies.