Diodes Incorporated B350B-13-F

Overview

B350B-13-F from Diodes Incorporated is a 50 V, 3.0 A surface-mount Schottky barrier rectifier in SMB package, featuring 0.70 V forward voltage at 3.0 A and 20 mA reverse leakage at rated 50 V DC blocking voltage, optimized for low-voltage, high-frequency inverters and polarity protection in automotive and industrial power supplies.

For engineers reviewing the B350B-13-F datasheet, B350B-13-F pinout, B350B-13-F application, or B350B-13-F equivalent, this device delivers verified thermal resistance (R_θJT = 25 °C/W), AEC-Q101 qualification, and surge capability up to 100 A peak for robust free-wheeling and DC-DC converter output rectification.

Technical Context

This Schottky rectifier employs guard ring die construction to enhance transient protection and withstand repetitive surge events. Its low forward voltage drop and fast switching behavior stem from metal–semiconductor junction physics, enabling high efficiency in 100 kHz–1 MHz switching topologies.

Designed for operation from –55 °C to +150 °C, it maintains stable leakage current (<20 µA at 25 °C, <20 mA at 100 °C) and capacitance (≤200 pF at 4 V, 1 MHz), supporting reliable performance in thermally constrained PCB layouts with SMB footprint constraints.

Key Specifications

Pinout & Package

Package: SMB (Surface Mount Body), molded plastic case with matte tin-plated terminals, cathode band marking, moisture sensitivity level 1 per J-STD-020, weight ≈ 0.093 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB350-E3/5BT and SS35H, B350B-13-F offers the lowest leakage at 25 °C (0.5 mA max), tighter VF consistency across production lots, and Diodes Inc.'s PPAP support-making it optimal for Tier-1 automotive sourcing with traceability requirements.

Availability

B350B-13-F is available at Aetrix Electronics and suitable for automotive power supply design, industrial DC-DC converter development, and LED driver free-wheeling applications requiring stable component supply and long-term lifecycle assurance.

Supply support for B350B-13-F 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 and signal integrity solutions for automotive, industrial, and consumer markets.

B350B-13-F belongs to the B3xxB Schottky rectifier product line, engineered specifically for high-efficiency, low-loss rectification in space-constrained, thermally demanding applications such as automotive body electronics and industrial power supplies.

FAQ

Is B350B-13-F AEC-Q101 qualified?

Yes. B350B-13-F is explicitly qualified to AEC-Q101 standards for high-reliability automotive applications, including temperature cycling, high-temperature reverse bias, and humidity testing. It is PPAP-capable and marked "B350BQ-13-F" for automotive-grade variants, though the standard B350B-13-F shares identical electrical and thermal specifications per Diodes Incorporated documentation.

What is the maximum operating temperature for continuous use?

The device supports continuous operation from –55 °C to +150 °C junction temperature. At terminal temperature T_T = +100 °C, its average forward current rating is 3.0 A. Derating follows Figure 6 in DS30924 Rev. 10–2: current drops linearly to ~1.5 A at T_T = +125 °C and ~0.8 A at T_T = +150 °C.

Can B350B-13-F replace B340B-13-F in an existing design?

Yes, with design verification. B350B-13-F has higher V_RRM (50 V vs. 40 V) and slightly higher V_F (0.70 V vs. 0.60 V at 3 A), resulting in ~160 mW higher conduction loss. Ensure reverse voltage margin and thermal margin are sufficient; no layout change is needed as both use identical SMB package and pinout.

Does B350B-13-F require a heatsink on standard FR-4 PCB?

No external heatsink is required. With R_θJT = 25 °C/W and R_θJA = 95 °C/W, a 2×3 mm copper pad provides sufficient thermal path. At 3.0 A and 0.70 V drop, power dissipation is 2.1 W; junction temperature rise above ambient is ~200 °C with R_θJA, but R_θJT dominates when mounted on adequate copper-keeping T_J within 150 °C limit at T_A ≤ 75 °C.