Diodes Incorporated SBL1045

Overview

SBL1045 from Diodes Incorporated is a 10A, 45V Schottky barrier rectifier in TO-220AC package, designed for low-voltage, high-frequency power conversion. It delivers 0.75V forward voltage at 10A/25°C, supports 250A non-repetitive surge current, and features 700pF junction capacitance - enabling use in free-wheeling diode circuits, DC-DC converter outputs, and polarity protection in industrial power supplies.

For engineers reviewing the SBL1045 datasheet, SBL1045 pinout, SBL1045 application, or SBL1045 equivalent, key selection criteria include its 45V blocking rating, thermal resistance of 3.5°C/W (junction-to-case), 10A average output current at 95°C case temperature, and RoHS-compliant bright tin terminals suitable for MIL-STD-202 soldering.

Technical Context

The SBL1045 employs a Schottky barrier chip with guard ring die construction to suppress transient-induced failure. Its unidirectional single-diode topology operates in half-wave rectification mode under 60Hz resistive/inductive loads, with capacitive load derating required (–20% current).

Thermal performance is defined with heatsink mounting per Note 1; junction-to-case thermal resistance is fixed at 3.5°C/W. Junction capacitance is measured at 1.0MHz and 4.0V reverse bias, confirming suitability for switching frequencies up to several hundred kHz.

Key Specifications

Pinout & Package

Package: TO-220AC - Molded plastic case, UL 94V-0 rated, with two leads (anode and cathode) and metal tab acting as cathode terminal and thermal path. Polarity marked on case per datasheet diagram.

Key Features

Applications

Availability

SBL1045 is available at Aetrix Electronics and suitable for industrial motor controls, automotive body electronics, and LED driver designs requiring stable component supply despite its obsolete status.

Supply support for SBL1045 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 SBL10xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical 5–60V power conversion where low VFM and high surge tolerance are mandatory.

FAQ

Is SBL1045 still in active production?

No. Diodes Incorporated officially discontinued the SBL1045 in August 2015, as confirmed in DS23042 Rev. 5. It is marked "OBSOLETE – PART DISCONTINUED" with "NO ALTERNATE PART" stated in the datasheet. Aetrix Electronics provides remaining original-stock inventory with full traceability and extended lifecycle support.

What is the correct pin configuration for SBL1045 in TO-220AC?

Pin 1 (left lead, viewed with marking side facing up and leads down) is the anode; Pin 2 (right lead) and the metal tab are both cathode terminals. The tab is electrically common with Pin 2 and serves as the primary thermal path - it must be insulated from ground unless intentionally used as cathode return.

Can SBL1045 replace SBL1040 or SBL1050 in existing designs?

Yes, with electrical verification. SBL1045 (45V VRRM) sits between SBL1040 (40V) and SBL1050 (50V). Replacing SBL1040 offers higher reverse margin; replacing SBL1050 reduces margin but retains identical package, thermal, and forward characteristics. Derating analysis for worst-case transients is required in either direction.

Does SBL1045 require a heatsink for 10A operation?

Yes. The 10A rating is specified at TC = 95°C, meaning the case temperature must not exceed 95°C. Without a heatsink, junction temperature will exceed safe limits under sustained 10A load due to RJC = 3.5°C/W. A minimum heatsink thermal resistance of ≤1.5°C/W is recommended for ambient temperatures up to 50°C.