Diodes Incorporated B390Q-13-F

Overview

B390Q-13-F from Diodes Incorporated is a 90 V, 3.0 A high-voltage Schottky barrier rectifier in SMC package, featuring 0.79 V max forward voltage at 3.0 A and 0.5 mA max reverse leakage at rated VR, designed for polarity protection, freewheeling, and low-voltage, high-frequency inverter applications.

For engineers reviewing the B390Q-13-F datasheet, B390Q-13-F pinout, B390Q-13-F application, or B390Q-13-F equivalent, key selection criteria include peak repetitive reverse voltage (90 V), average rectified output current (3.0 A), thermal resistance junction-to-case (24 °C/W), surge rating (100 A peak), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Schottky rectifier uses guard ring die construction to enhance transient robustness and suppress avalanche-induced failure during inductive switching events. Its low VF (0.79 V max @ 3.0 A, 25 °C) and low IR (0.5 mA max @ 90 V, 25 °C) directly reduce conduction loss and standby power dissipation in DC/DC and flyback topologies.

The device operates across –55 °C to +150 °C with R_θJC = 24 °C/W and R_θJA = 62 °C/W (FR-4 board, 0.4"×0.5", 2 oz Cu), enabling stable performance in thermally constrained automotive and industrial power rails without forced cooling.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), surface-mount, molded plastic with matte tin-plated terminals and cathode band marking. Dimensions: 6.90 mm × 4.40 mm × 2.50 mm (L × W × H), weight ≈ 0.21 g.

Key Features

Applications

Availability

B390Q-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, solar microinverters, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant discrete rectifiers.

Supply support for B390Q-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, signal integrity, and protection solutions for automotive, industrial, and computing markets.

The B390Q-13-F belongs to the B370Q–B3100Q high-voltage Schottky rectifier family, engineered for commercial and automotive applications demanding low VF, high surge tolerance, and extended temperature operation without compromising RoHS or halogen-free compliance.

FAQ

What is the maximum junction temperature and how does it affect derating?

The B390Q-13-F has a maximum junction temperature of +150 °C. At case temperatures above +90 °C, its average forward current must be linearly derated from 3.0 A to zero at +150 °C, as shown in Figure 4 of DS38667. This ensures safe operation under sustained thermal stress without exceeding R_θJC-limited power dissipation.

Is B390Q-13-F pin-compatible with other parts in the B3X0Q series?

Yes - all B370Q–B3100Q variants share identical SMC (DO-214AB) package dimensions, terminal layout, and polarity marking (cathode band). Mechanical and solder footprint compatibility is guaranteed across the series, enabling design reuse with only V_RRM and I_R parameter adjustments.

How does the guard ring construction improve reliability?

The guard ring die structure controls electric field distribution at the silicon periphery, preventing premature edge breakdown during voltage transients. This extends surge survivability beyond standard Schottky limits and reduces failure probability in inductive load switching, such as automotive solenoid drivers and relay coils.

Does B390Q-13-F require special PCB layout considerations?

Yes - to achieve the published R_θJA = 62 °C/W, use a minimum 0.2" × 0.25" copper pad on FR-4 with 2 oz copper thickness. Avoid thermal isolation; connect the cathode pad directly to internal ground planes or thermal vias. Refer to Diodes' suggested SMC pad layout (X = 2.50 mm, Y = 3.30 mm, C = 6.90 mm, G = 4.40 mm) for optimal thermal performance.