Diodes Incorporated B350Q-13-F

Overview

B350Q-13-F from Diodes Incorporated is a 50 V, 3.0 A surface-mount Schottky barrier rectifier in SMC package, featuring 0.70 V max forward voltage at 3.0 A and 0.5 mA max reverse leakage at rated VR, designed for automotive polarity protection and freewheeling diode applications.

For engineers reviewing the B350Q-13-F datasheet, B350Q-13-F pinout, B350Q-13-F application, or B350Q-13-F equivalent, key selection criteria include peak repetitive reverse voltage (50 V), average rectified output current (3.0 A), thermal resistance (20 °C/W junction-to-terminal), AEC-Q101 qualification, and RoHS-compliant lead-free plating.

Technical Context

This Schottky rectifier uses guard ring die construction to enhance transient robustness in automotive environments and supports high-frequency switching with low forward voltage drop and minimal stored charge. Its 200 pF typical capacitance at 4 V reverse bias enables stable operation in low-voltage DC/DC and inverter freewheeling paths.

Rated for -55 °C to +150 °C operating temperature and qualified per AEC-Q101, it delivers reliable performance under thermal stress and mechanical vibration. The SMC package provides 90 °C/W junction-to-ambient thermal resistance on standard FR-4, enabling compact layout without forced cooling in 3 A power rails.

Key Specifications

Pinout & Package

Package: SMC (Surface-Mount Case), molded plastic with UL 94V-0 rating, cathode band polarity marking, matte tin-plated terminals, 0.21 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB350-E3/54 and SS35, B350Q-13-F uniquely combines AEC-Q101 qualification, 0.70 V VF ceiling for predictable loss budgeting, and 0.5 mA IR ceiling for low-power automotive sleep modes-making it the sole option for production-tier automotive ECUs requiring PPAP documentation and IATF 16949 traceability.

Availability

B350Q-13-F is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and consumer DC/DC converters requiring stable component supply, AEC-Q101 compliance, and RoHS 3–certified sourcing.

Supply support for B350Q-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, headquartered in Plano, Texas, with design, manufacturing, and test facilities certified to IATF 16949 and ISO 9001 standards.

The B320Q–B360Q series belongs to Diodes' automotive-qualified Schottky rectifier product line, engineered specifically for polarity protection, freewheeling, and recirculating functions in 12 V and 24 V vehicle subsystems.

FAQ

Is B350Q-13-F suitable for 24 V commercial vehicle applications?

Yes. With 50 V VRRM, -55 °C to +150 °C operating range, and AEC-Q101 qualification, B350Q-13-F supports 24 V nominal systems subject to ISO 16750-2 load dump transients (up to 35 V for 400 ms). Its 100 A IFSM rating handles motor stall currents in cab HVAC and wiper drivers.

What is the maximum PCB copper pad area recommended for thermal performance?

Diodes specifies a 2 mm × 3 mm copper pad for RθJA measurement. For optimal thermal performance at full 3.0 A load, use ≥100 mm² of 2-oz copper on the primary side, connected via ≥4 thermal vias (0.3 mm diameter) to inner ground planes to achieve ≤85 °C junction rise at +85 °C ambient.

Does B350Q-13-F have a defined moisture sensitivity level (MSL)?

Yes. Per J-STD-020, B350Q-13-F is rated MSL Level 1 - unlimited floor life at ≤30 °C/85 % RH. No baking is required prior to reflow, and standard Pb-free reflow profiles (peak 260 °C, 30 sec) are supported per Diodes' packaging specification.

Can B350Q-13-F replace B340Q-13-F in an existing design?

Yes, with verification. Both share identical SMC package, 3.0 A IO, and 0.5 mA IR, but B350Q-13-F has higher VRRM (50 V vs. 40 V) and slightly higher VF (0.70 V vs. 0.50 V). It is safe for backward compatibility where reverse voltage margin is critical, though conduction loss increases by ~0.2 W at 3 A.