Diodes Incorporated B345AE-13

Overview

B345AE-13 from Diodes Incorporated is a 45 V, 3 A surface-mount Schottky barrier rectifier in SMA package, featuring 0.50 V max forward voltage at 3 A and 0.30 mA max reverse leakage at 45 V/25°C, optimized for boost, blocking, and recirculating diode roles in DC-DC converters and power supplies.

For engineers reviewing the B345AE-13 datasheet, B345AE-13 pinout, B345AE-13 application, or B345AE-13 equivalent, key selection criteria include its low VF for efficiency, high-temperature IR stability up to +150°C, RoHS-compliant matte tin terminals, and SMA thermal resistance (RθJA = 60°C/W) on FR-4 PCBs.

Technical Context

This Schottky rectifier uses a planar epitaxial construction with low-barrier metal-semiconductor junction to achieve low forward voltage drop and fast switching without minority-carrier storage delay. Its design targets continuous conduction mode (CCM) operation in 100–500 kHz DC-DC topologies.

Thermal performance is defined by RθJC = 30°C/W and RθJA = 60°C/W on standard 1"×1" FR-4 board, enabling 3 A average current handling up to +125°C ambient when derated per Figure 4. Reverse recovery time is effectively zero due to majority-carrier conduction.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, single-diode configuration with cathode band marking. Dimensions: 4.60 × 2.92 × 1.63 mm (L × W × H). Molded green compound, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS34 and SB340, B345AE-13 uniquely supports 45 V systems with lowest IR at rated voltage, making it optimal for next-gen 48 V intermediate bus converters where leakage and voltage margin are critical.

Availability

B345AE-13 is available at Aetrix Electronics and suitable for DC-DC boost converters, OR-ing power paths, solenoid drivers, and laptop adapter rectifiers requiring stable component supply and consistent thermal performance across temperature extremes.

Supply support for B345AE-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 B3xxAE series belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for high-efficiency, high-temperature power conversion in automotive, industrial, and computing applications.

FAQ

What is the maximum junction temperature for continuous operation?

The B345AE-13 has an operating junction temperature range of –55°C to +150°C. Continuous operation at TJ = +150°C is permitted only when thermal design ensures actual junction temperature remains within this limit, verified via RθJA derating curves and board layout validation.

Is the SMA package compatible with standard reflow soldering profiles?

Yes - the B345AE-13 is rated J-STD-020 Level 1 for moisture sensitivity and features matte tin annealed terminals fully compatible with IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C for 10 seconds.

How does reverse leakage change at elevated temperature?

At VR = 45 V, IR rises to ≤35 mA at TJ = +125°C (per datasheet Note 6), significantly higher than the 0.30 mA at 25°C. This must be accounted for in high-temperature designs where leakage impacts no-load regulation or standby power.

Can B345AE-13 replace B340AE in existing designs?

Yes - both share identical SMA package, pinout, and thermal characteristics. The B345AE offers +5 V higher VRRM (45 V vs. 40 V) with identical VF and IR specs at their respective rated voltages, providing enhanced voltage margin without layout or thermal redesign.