Diodes Incorporated SBL3045PT

Overview

SBL3045PT from Diodes Incorporated is a 45 V, 30 A TO-3P Schottky barrier rectifier optimized for low-voltage, high-frequency DC/DC conversion, free-wheeling, and polarity protection. It features 0.70 V forward voltage at 15 A (25°C), 275 A non-repetitive surge capability, and 2.0 °C/W junction-to-case thermal resistance.

For engineers reviewing the SBL3045PT datasheet, SBL3045PT pinout, SBL3045PT application, or SBL3045PT equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance under forced convection, surge rating for inductive load switching, and TO-3P mechanical compatibility with heatsink mounting requirements.

Technical Context

This dual-anode common-cathode Schottky rectifier uses guard ring die construction to enhance transient voltage immunity and reduce leakage during reverse-biased operation. Its low V_F and fast recovery enable high-efficiency operation in 100–500 kHz switch-mode power supplies.

The device is rated for continuous 30 A average output current at T_C = 95°C with derating above that temperature, and exhibits 1100 pF typical junction capacitance at 4 V reverse bias and 1 MHz - critical for minimizing switching losses in high-frequency topologies.

Key Specifications

Pinout & Package

Package: TO-3P molded plastic case (UL 94V-0), with three terminals: two anodes (A1, A2) and one common cathode (K). Mounting hole centered between anodes accommodates M3 screw for heatsink attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBL3040PT and SBL3050PT, the SBL3045PT provides optimal balance for 24–36 V nominal systems: sufficient 45 V headroom for load dump transients while maintaining competitive forward voltage and thermal performance.

Availability

SBL3045PT is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, telecom DC/DC converters, and high-frequency inverters requiring stable component supply and long-term manufacturability assurance.

Supply support for SBL3045PT 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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The SBL30xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, thermally constrained applications in 12–48 V power conversion and protection circuits.

FAQ

Is SBL3045PT RoHS compliant and lead-free?

Yes. The SBL3045PT features a lead-free finish and is RoHS compliant per EU Directive 2011/65/EU Annex II, with exemptions applied for high-melting-point solder (lead content < 0.1 wt%) and glass encapsulation per Annex III Notes 5 and 7.

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

The SBL3045PT is rated for 30 A average rectified current at T_C = 95°C. Operation above this temperature requires linear derating per Figure 1 in the datasheet - e.g., 22 A at 110°C, 15 A at 125°C - with heatsink thermal interface resistance directly impacting achievable current.

Can SBL3045PT be used in parallel configurations?

Yes, its dual-anode common-cathode TO-3P structure supports parallel connection of A1 and A2 to increase current capacity. However, external balancing resistors (≤ 10 mΩ) are recommended to ensure equal current sharing due to minor V_F mismatch between internal dies.

Does SBL3045PT require a heatsink for 20 A continuous operation?

Yes. At 20 A and ambient 50°C, junction temperature exceeds 150°C without heatsinking. With a 1.5 °C/W heatsink and thermal interface material (0.5 °C/W total R_θJA), T_J remains at ~115°C - within safe operating range. Mounting torque must be 0.5–0.7 N·m to ensure optimal R_θJC.