Diodes Incorporated B120AF-13

Overview

B120AF-13 from Diodes Incorporated is a 20 V, 1 A surface-mount Schottky barrier rectifier in SMAF package, featuring 0.5 V max forward voltage at 1 A and 0.1 mA max reverse leakage at 20 V/25°C, optimized for boost, blocking, and recirculating diode functions in DC-DC converters and power supplies.

For engineers reviewing the B120AF-13 datasheet, B120AF-13 pinout, B120AF-13 application, or B120AF-13 equivalent, key selection criteria include low VF for efficiency, high-temperature IR stability, RoHS-compliant lead-free construction, and SMAF thermal performance in compact power designs.

Technical Context

This Schottky rectifier uses a platinum-silicide or similar low-barrier metal-semiconductor junction to achieve fast switching with no minority-carrier storage delay, enabling operation up to 100 kHz in SMPS topologies. Its 20 V VRRM rating targets low-voltage input stages such as 12 V or 5 V rail conditioning.

The device exhibits 0.455 V typical VF at 1 A/25°C and maintains <0.5 V up to 125°C, while reverse leakage stays ≤0.005 mA at 20 V/25°C and ≤0.10 mA at 20 V/125°C - critical for thermal runaway mitigation in sealed or high-ambient environments.

Key Specifications

Pinout & Package

Package: SMAF (Surface Mount Axial Flat), molded plastic case with matte tin–annealed copper leadframe, UL 94V-0 rated, 0.036 g weight, cathode band polarity marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB120-E3/54 and 1N5817TR, B120AF-13 delivers superior thermal resistance (95 °C/W vs. >150 °C/W), tighter IR control at high temperature, and RoHS/green compliance without trade-offs in VF or surge rating - making it optimal for high-density, thermally demanding 12 V power rails.

Availability

B120AF-13 is available at Aetrix Electronics and suitable for DC-DC converter design, battery management systems, and automotive accessory power modules requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for B120AF-13 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-efficiency power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The B120AF-13 belongs to Diodes' Schottky Rectifier product line, engineered specifically for low-voltage, high-current rectification in space- and thermally-constrained power supplies where VF, IR, and reliability at elevated temperature are critical.

FAQ

What is the maximum junction temperature for continuous operation of B120AF-13?

The B120AF-13 has an operating junction temperature range of –55°C to +150°C. For continuous 1 A DC operation, thermal design must ensure TJ remains ≤150°C - achievable with RθJA ≤95 °C/W and TA ≤75°C using recommended 0.2"×0.25" copper pad per Diodes' layout guidelines.

Does B120AF-13 meet automotive qualification standards?

B120AF-13 is not AEC-Q101 qualified per its datasheet, though it shares construction and test methods with qualified variants. It is rated for industrial temperature range (–55°C to +150°C) and used in automotive accessory modules where qualification is not mandated, but full AEC-Q101 parts like DFLS220Q should be selected for safety-critical ECUs.

Can B120AF-13 replace a standard PN rectifier like 1N4001 in a 12 V supply?

Yes - B120AF-13 can replace 1N4001 in low-voltage, high-efficiency applications: its 0.5 V VF cuts conduction loss by ~65% versus 1N4001's 1.1 V, reducing heat generation significantly. However, its 20 V VRRM limits use to ≤12 V circuits; 1N4001's 50 V rating allows broader voltage headroom.

Is the SMAF package compatible with standard reflow profiles?

Yes - B120AF-13's SMAF package is rated for moisture sensitivity level 1 (MSL-1) per J-STD-020 and supports standard Pb-free reflow profiles (peak 260°C, 10–30 sec). The matte tin–annealed leadframe ensures reliable solder wetting without pre-baking, even after extended ambient storage.