Diodes Incorporated B320AQ-13-F

Overview

B320AQ-13-F from Diodes Incorporated is a 20 V, 3.0 A surface-mount Schottky barrier rectifier in SMA package, featuring 0.50 V max forward voltage at 3 A and 0.5 mA max reverse leakage at rated voltage. It delivers low power loss for high-efficiency DC-DC converters and polarity protection circuits in automotive and industrial power supplies.

For engineers reviewing the B320AQ-13-F datasheet, B320AQ-13-F pinout, B320AQ-13-F application, or B320AQ-13-F equivalent, this part is selected for low-VF, high-current rectification in space-constrained 25–150°C ambient environments where thermal resistance (RθJA = 140°C/W) and AEC-Q101 qualification are critical design requirements.

Technical Context

This Schottky rectifier uses guard ring die construction to suppress transient-induced junction breakdown and supports automated SMT assembly with matte-tin lead-free plating compliant to RoHS 3 and halogen-free "Green" standards. Its 20 V VRRM rating targets low-voltage DC rails, while its 80 A non-repetitive surge capability handles inductive turn-off transients.

Thermal performance is defined by two RθJA values: 140°C/W on FR-4 PCB (min pad layout) and 100°C/W on glass epoxy with 2 mm × 3 mm copper pad. Junction temperature range spans –55°C to +150°C, enabling operation in under-hood automotive modules and industrial motor drives.

Key Specifications

Pinout & Package

Package: SMA (Surface Mount Axial), molded plastic body with cathode band marking; dimensions: 4.00–4.60 mm (L) × 2.29–2.92 mm (W) × 1.27–1.63 mm (H); weight ≈ 0.064 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB320-E3/52 and SS32, B320AQ-13-F offers the lowest VF (0.50 V) among AEC-Q101-qualified 20 V/3 A Schottkys and integrates IATF 16949 manufacturing traceability-making it optimal for safety-critical automotive power rails where both efficiency and process rigor are mandatory.

Availability

B320AQ-13-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, and smart meter power supplies requiring stable component supply across extended product lifecycles.

Supply support for B320AQ-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.

The B320AQ-13-F belongs to Diodes' AEC-Q101-qualified Schottky rectifier product line, engineered specifically for low-VF, high-current rectification in harsh-environment automotive and industrial power conversion systems.

FAQ

What is the maximum junction temperature and how is it maintained?

The B320AQ-13-F has a maximum junction temperature (TJ) of +150°C. To maintain this limit, the device must be mounted on an FR-4 PCB using Diodes' minimum recommended SMA pad layout (C = 4.00 mm, G = 1.50 mm, X = 2.50 mm), which achieves RθJA = 140°C/W. At 3.0 A average current and 25°C ambient, power dissipation is ~1.5 W, resulting in ΔT = 210°C-so derating or enhanced cooling is required above 25°C ambient.

Is B320AQ-13-F suitable for reflow soldering and what profile is recommended?

Yes, B320AQ-13-F is qualified for lead-free reflow soldering per J-STD-020. Its moisture sensitivity level is MSL 1 (unlimited floor life), and it supports peak temperatures up to 260°C. Diodes recommends using a standard Pb-free reflow profile with ramp rate ≤3°C/s, preheat 150–200°C for 60–120 s, soak 200–220°C for 60–120 s, and peak 235–245°C for 10–30 s.

How does the guard ring construction improve reliability in automotive applications?

The guard ring die structure surrounds the active Schottky junction to suppress edge-field concentration during voltage transients, reducing susceptibility to avalanche breakdown and hot-carrier degradation. In automotive load-dump tests (ISO 7637-2 Pulse 5a), this enables sustained operation without parametric shift or catastrophic failure-validated per AEC-Q101 stress test conditions.

Can B320AQ-13-F replace B330AQ or B340AQ in a design?

No-B320AQ-13-F is rated for 20 V VRRM, while B330AQ and B340AQ are rated for 30 V and 40 V respectively. Substituting B320AQ into a circuit designed for ≥30 V reverse blocking risks premature breakdown. However, if the system's maximum reverse voltage remains ≤20 V, B320AQ may be used-but VF and thermal behavior remain identical, so layout and thermal design need no revision.