Diodes Incorporated SBL2045PT

Overview

SBL2045PT from Diodes Incorporated is a 20A, 45V Schottky barrier rectifier in TO-3P package, featuring low forward voltage drop (0.55 V @ 10 A, 25°C), high surge capability (250 A, 8.3 ms), and thermal resistance of 2.5°C/W junction-to-case - used for polarity protection and free-wheeling in DC-DC converters and industrial power supplies.

For engineers reviewing the SBL2045PT datasheet, SBL2045PT pinout, SBL2045PT application, or SBL2045PT equivalent, key selection criteria include its 45 V blocking rating, 20 A average rectified current at 100°C case temperature, low conduction loss, transient robustness via guard ring die construction, and RoHS-compliant bright tin-plated leads.

Technical Context

This device employs a Schottky barrier structure with guard ring die construction to enhance transient voltage immunity and reduce reverse recovery charge. Its low forward voltage minimizes conduction losses in high-frequency switching applications such as synchronous rectification and flyback snubbers.

The TO-3P package enables direct heatsink mounting with verified 2.5°C/W thermal resistance, supporting sustained 20 A operation at TC = 100°C. Capacitance is 1100 pF at 1 MHz and 4 V reverse bias, limiting high-frequency noise coupling in EMI-sensitive designs.

Key Specifications

Pinout & Package

TO-3P plastic package with three terminals: anode, cathode, and metal tab (cathode-connected). Molded case meets UL 94V-0 flammability rating; terminals are bright tin-plated for MIL-STD-202 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH04 and MBR2045CT, the SBL2045PT delivers the lowest forward voltage in TO-3P form factor, balancing thermal performance, board area, and conduction loss - ideal for space-constrained 20 A single-path rectification where efficiency and manufacturability are prioritized.

Availability

SBL2045PT is available at Aetrix Electronics and suitable for DC-DC converter output rectification, industrial motor drive freewheeling, and polarity protection requiring stable component supply and long-term production continuity.

Supply support for SBL2045PT 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, manufacturing, and sales operations across Asia, Europe, and North America.

The SBL20xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for industrial power conversion, automotive auxiliary systems, and telecom infrastructure where low VFM, high surge tolerance, and robust packaging are essential.

FAQ

Is SBL2045PT suitable for surface-mount assembly?

No. The SBL2045PT uses a through-hole TO-3P package with three leads and a metal tab designed for bolt-down heatsink mounting. It is not compatible with reflow or wave soldering processes intended for SMT components. Manual insertion and hand-soldering or mechanical fastening are required.

What is the maximum recommended case temperature for continuous operation?

The datasheet specifies 20 A average rectified current at TC = 100°C. Operation above this temperature requires derating per Figure 1 - at 125°C case temperature, maximum sustainable current drops to approximately 14 A. Thermal design must ensure the tab remains ≤100°C under worst-case load and ambient conditions.

Does SBL2045PT have a built-in thermal shutdown function?

No. As a passive discrete diode, the SBL2045PT has no internal thermal protection circuitry. Overtemperature management relies entirely on external thermal design - including heatsink selection, mounting pressure, thermal interface material, and airflow - to maintain junction temperature within the -65°C to +150°C operating range.

Can SBL2045PT replace SBL2040PT in an existing design?

Yes, with full functional compatibility: both share identical TO-3P package, pinout, thermal characteristics, and 20 A current rating. The only difference is VRRM - 45 V vs. 40 V - giving SBL2045PT higher reverse voltage margin. No layout or thermal changes are needed, and it provides improved safety margin in noisy or high-surge environments.