Diodes Incorporated SB150-B

Overview

SB150-B from Diodes Incorporated is a 1.0A, 50V peak repetitive reverse voltage Schottky barrier rectifier in DO-41 plastic package, featuring 0.70V forward voltage at 1.0A, 40A non-repetitive surge capability, and −65°C to +125°C operating temperature range; used for polarity protection and free-wheeling in low-voltage DC/DC converters.

For engineers reviewing the SB150-B datasheet, SB150-B pinout, SB150-B application, or SB150-B equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (R_JL = 15°C/W), surge rating under 8.3ms half-sine, reverse leakage at 100°C, and DO-41 mechanical compatibility in space-constrained PCB layouts.

Technical Context

This Schottky rectifier uses guard-ring die construction to enhance transient immunity and reduce reverse recovery charge. Its low V_F and high I_FSM support efficient energy transfer in high-frequency switching topologies.

Designed for single-phase, half-wave rectification with resistive or inductive loads, it requires 20% current derating for capacitive loads and exhibits typical junction-to-lead thermal resistance of 15°C/W under standard mounting conditions.

Key Specifications

Pinout & Package

DO-41 plastic package: axial-leaded, molded black epoxy case, UL 94V-0 rated, with cathode band marking polarity. Leads plated with bright tin, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB150-T and SS15, SB150-B offers optimal balance of legacy through-hole compatibility, low-cost bulk packaging, and verified thermal performance in lead-mounted configurations-making it preferred for field-serviceable and medium-volume industrial designs.

Availability

SB150-B is available at Aetrix Electronics and suitable for DC power input protection, automotive body control modules, low-voltage DC/DC converter outputs, and industrial sensor interfaces requiring stable component supply and long-term obsolescence management.

Supply support for SB150-B 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 and manufacturing operations across Asia and the Americas.

The SBxx0 series targets cost-sensitive, high-reliability rectification in automotive, industrial, and consumer power supplies-emphasizing robust surge handling, low V_F, and RoHS-compliant packaging for global compliance.

FAQ

What is the maximum allowable junction temperature for SB150-B?

The SB150-B has a maximum operating junction temperature of +125°C, validated per JEDEC test conditions. This rating applies under specified thermal conditions: 9.5mm lead length, ambient ≤75°C, and average forward current ≤1.0A. Exceeding this temperature risks accelerated parametric shift and reduced lifetime.

Can SB150-B be used in place of a PN junction rectifier like 1N4007?

No-SB150-B is not a drop-in replacement for 1N4007. While both are axial diodes, SB150-B is a Schottky device with 50V V_RRM and 0.70V V_F, whereas 1N4007 has 1000V V_RRM and ~1.1V V_F. Substitution requires verifying reverse voltage margin and thermal dissipation in the target circuit.

Is SB150-B suitable for high-frequency switching applications above 100kHz?

Yes-its Schottky architecture provides near-zero reverse recovery time, enabling efficient operation up to several hundred kHz. Figure 5 shows typical capacitance of ~100pF at 50V, confirming suitability for switch-mode power supplies where fast switching and low Q_rr are critical.

Does SB150-B require derating when mounted horizontally on a PCB?

Yes-per Figure 1, the forward current derating curve assumes 9.5mm lead length and natural convection. Horizontal mounting without heatsinking reduces thermal dissipation; at 75°C ambient, I_O must be limited to ≤0.85A to maintain T_j ≤125°C. Use vertical mounting or add thermal relief pads for full 1.0A rating.