Diodes Incorporated B120Q-13-F

Overview

B120Q-13-F from Diodes Incorporated is a 1.0A surface-mount Schottky barrier rectifier with 20V peak repetitive reverse voltage (V_RRM), 0.5V maximum forward voltage at 1.0A, and 0.5mA maximum reverse leakage current at 25°C. It features guard ring die construction for transient protection, AEC-Q101 qualification, and is packaged in SMA for polarity protection and freewheeling applications in automotive power supplies.

For engineers reviewing the B120Q-13-F datasheet, B120Q-13-F pinout, B120Q-13-F application, or B120Q-13-F equivalent, this device is selected for low-loss DC/DC output rectification, reverse polarity protection in 12V automotive modules, and high-frequency flyback snubber circuits where fast recovery and low conduction loss are critical.

Technical Context

This Schottky diode operates as a unidirectional, low-V_F rectifying element with no minority-carrier storage delay-enabling sub-12ns reverse recovery (t_RR). Its junction-to-ambient thermal resistance is 115°C/W on standard FR-4 PCB (no heatsink) and drops to 65°C/W with a 50mm×50mm×23mm aluminum heatsink.

The device supports surge currents up to 30A (8.3ms half-sine), withstands 4kV HBM ESD, and maintains stable leakage (<0.5mA at 20V, 25°C) and capacitance (110pF at 4V, 1MHz) across its operating temperature range of −65°C to +150°C.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, matte tin-plated terminals, cathode band polarity marking, and 0.064g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB120-E3/52 and SS12, B120Q-13-F delivers superior automotive reliability (AEC-Q101), lower leakage (0.5mA vs. ≥1.0mA), and better thermal performance (115°C/W vs. 125°C/W), making it optimal for space-constrained, thermally demanding automotive and industrial power rails.

Availability

B120Q-13-F is available at Aetrix Electronics and suitable for automotive body control modules, USB-C power delivery input protection, and industrial 24V PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for B120Q-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 B120Q/BQ series belongs to Diodes' AEC-Q101-qualified Schottky rectifier product line, engineered specifically for low-loss, high-reliability DC power conversion and polarity protection in harsh automotive and industrial environments.

FAQ

Is B120Q-13-F suitable for use in automotive under-hood applications?

Yes. B120Q-13-F is AEC-Q101 qualified and rated for −65°C to +150°C operating temperature. Its guard ring die, 30A surge rating, and RoHS-compliant lead-free plating meet automotive under-hood reliability requirements including thermal cycling, humidity, and mechanical shock testing.

What is the recommended PCB pad layout for SMA package soldering?

The official Diodes Inc. recommended SMA pad layout specifies C = 4.00 mm, G = 1.50 mm, X = 2.50 mm, X1 = 6.50 mm, and Y = 1.70 mm (all dimensions in mm). This layout ensures optimal thermal transfer and solder joint reliability per J-STD-020 Level 1 moisture sensitivity handling.

Does B120Q-13-F have a cathode notch or cathode band marking?

Yes. B120Q-13-F uses a visible cathode band marking on the SMA package body. The band identifies the cathode terminal, which must be connected toward the higher-potential side of the circuit for correct forward bias and reverse blocking operation.

Can B120Q-13-F replace a standard 1N4001 in a 12V power supply?

No - not directly. While both handle 1A average current, the 1N4001 is a slow silicon PN rectifier (1.1V V_F, 30µs t_RR) optimized for 50/60Hz line frequency. B120Q-13-F is a Schottky device (0.5V V_F, 12ns t_RR) intended for high-frequency switching supplies; using it in place of a 1N4001 may cause excessive leakage at elevated temperatures due to its higher IR sensitivity.