Diodes Incorporated B350AF-13

Overview

B350AF-13 from Diodes Incorporated is a 50 V, 3 A surface-mount Schottky barrier rectifier in SMAF package, featuring 0.65 V max forward voltage at 3 A and 0.2 mA max reverse leakage at 50 V and +25°C, optimized for boost, blocking, and recirculating diode roles in DC-DC converters and power supplies.

For engineers reviewing the B350AF-13 datasheet, B350AF-13 pinout, B350AF-13 application, or B350AF-13 equivalent, this device delivers verified low VF and high-temperature IR stability critical for thermal reliability in compact, high-efficiency 5–24 V input power stages.

Technical Context

This Schottky rectifier uses a planar metal-silicon junction to achieve low conduction loss and fast switching with no minority-carrier storage delay. Its 50 V VRRM rating supports standard 3.3 V–24 V rail applications with margin against transient overvoltage.

Thermal resistance is specified at RθJA = 90 °C/W (FR-4, 0.4"×0.5", 2 oz Cu) and RθJC = 50 °C/W, enabling sustained 3 A operation up to +125°C ambient when properly mounted on ≥0.2"×0.25" copper pad.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB350-E3/54 and SS34, B350AF-13 uniquely balances 50 V rating, 0.65 V VF ceiling, and 0.2 mA IR - making it optimal for industrial 24 V power rails where both surge margin and thermal stability are required.

Availability

B350AF-13 is available at Aetrix Electronics and suitable for DC-DC converter boost diodes, battery backup blocking circuits, recirculating paths in automotive body controllers, and OR-ing applications requiring stable component supply across extended temperature ranges.

Supply support for B350AF-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The B350AF-13 belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for efficiency-critical, thermally demanding power conversion in industrial and automotive subsystems.

FAQ

What is the maximum junction temperature for continuous operation?

The B350AF-13 has a rated TJ range of –55°C to +150°C. Continuous operation at full 3 A IO requires maintaining TJ ≤ +150°C, achievable with RθJA = 90 °C/W and TA ≤ +75°C using minimum recommended copper area (0.2" × 0.25"). Derating curves in Figure 4 confirm 2.2 A max at +100°C ambient.

Is the SMAF package compatible with standard SMA reflow profiles?

Yes - the SMAF package is qualified for standard SnPb and lead-free reflow per J-STD-020. Its moisture sensitivity level is MSL 1 (unlimited floor life), and the matte tin–annealed leadframe ensures reliable solder wetting at peak temperatures up to 260°C for ≤60 seconds.

How does reverse leakage behave at elevated temperature?

Per datasheet Figure 2, IR rises to ≤24 mA at VR = 60 V and TJ = +125°C for B360AF; B350AF shows ≤0.03 mA at VR = 50 V, +125°C. This controlled increase ensures predictable thermal behavior without runaway in sealed enclosures up to +105°C ambient.

Can B350AF-13 replace B360AF-13 in a 60 V circuit?

No - B350AF-13 has VRRM = 50 V and must not be used where reverse voltage may exceed that rating. In a 60 V system, B360AF-13 (60 V VRRM) is required; substituting B350AF-13 risks catastrophic breakdown during line transients or startup overshoot.