Diodes Incorporated SBL3045CT

Overview

SBL3045CT from Diodes Incorporated is a 30A, 45V Schottky barrier rectifier in TO-220AB package, featuring low forward voltage drop (0.55V @ 15A, 25°C), high surge capability (250A @ 8.3ms), and thermal resistance of 1.5°C/W. It is designed for low-voltage, high-frequency inverters, freewheeling diode applications, and polarity protection circuits in industrial power supplies.

For engineers reviewing the SBL3045CT datasheet, SBL3045CT pinout, SBL3045CT application, or SBL3045CT equivalent, key selection criteria include forward voltage at rated current, peak repetitive reverse voltage, surge current rating, thermal resistance junction-to-case, and RoHS-compliant lead-free finish with UL 94V-0 molded plastic housing.

Technical Context

This dual-die common-cathode Schottky rectifier uses guard ring die construction for transient protection and supports single-phase, half-wave rectification at 60Hz with resistive or inductive loads. Its 45V VRRM rating and 30A average output current are validated under TC = 100°C conditions with heatsink mounting.

Capacitance is specified at 450pF (1MHz, 4V reverse bias), and reverse leakage remains ≤1.0mA at 25°C and ≤75mA at 100°C - critical for high-efficiency DC-DC stages where leakage-induced standby loss must be minimized.

Key Specifications

Pinout & Package

Package: TO-220AB - Molded plastic case with UL 94V-0 flammability rating, bright tin-plated terminals, and mechanical dimensions compliant with JEDEC TO-220AB standard (A: 14.48–15.75 mm, B: 10.00–10.40 mm, etc.). Polarity marked on body; Pin 1 and Pin 2 are anodes, Pin 3 is common cathode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR3045CT and STPS3045CG, the SBL3045CT offers balanced trade-offs: moderate VFM, proven thermal performance at 100°C case temperature, and cost-effective qualification for industrial-grade power conversion - making it optimal for non-automotive, non-server 24–48V systems with defined thermal management.

Availability

SBL3045CT is available at Aetrix Electronics and suitable for industrial power supplies, DC motor drive freewheeling circuits, and polarity protection modules requiring stable component supply and long-term manufacturing continuity.

Supply support for SBL3045CT 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The SBL3045CT belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, medium-power industrial and computing power conversion where low VFM and repeatable surge tolerance are primary design drivers.

FAQ

What is the maximum allowable case temperature for continuous 30A operation?

The SBL3045CT is rated for 30A average forward current only when the case temperature (TC) is maintained at 100°C, as confirmed in the derating curve (Figure 1). Exceeding this temperature without adjusting current reduces reliability and risks thermal runaway due to positive temperature coefficient of forward voltage.

Is the SBL3045CT suitable for capacitive-input filter applications?

No - the datasheet explicitly states that for capacitive loads, the average current must be derated by 20%. This is due to increased RMS current and peak diode stress caused by high charging currents into bulk capacitors, which can exceed the device's surge and thermal limits if not accounted for.

Does the TO-220AB package require insulating hardware when mounted to a heatsink?

Yes - the TO-220AB package has electrically active metal tab (Pin 3, common cathode) exposed on the backside. Direct mounting to a grounded heatsink creates a short circuit unless insulated with mica or polymer washers and shoulder washers, as specified in Diodes' application note AP02007.

Why is the SBL3045CT marked "NOT RECOMMENDED FOR NEW DESIGNS"?

Diodes Incorporated designates SBL3045CT as legacy due to the introduction of improved alternatives like MBR3045CT with lower VFM and tighter parametric distributions. While fully functional and supported, new designs should evaluate MBR3045CT for better efficiency and long-term supply assurance.