Diodes Incorporated SB240-A52

Overview

SB240-A52 from Diodes Incorporated is a 40 V, 2.0 A surface-mount Schottky rectifier in DO-15 package, featuring 0.55 V forward voltage at 2.0 A, 60 A non-repetitive surge capability, and IEC 61000-4-2 Level 4 ESD protection (≥15 kV air). It serves as a low-loss freewheeling diode in DC-DC converters and polarity protection switch in 12 V automotive power rails.

For engineers reviewing the SB240-A52 datasheet, SB240-A52 pinout, SB240-A52 application, or SB240-A52 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (R_ΘJA = 45 °C/W), junction temperature range (–55 to +150 °C), and DO-15 mechanical compatibility with through-hole PCB layouts.

Technical Context

This Schottky rectifier uses a metal-semiconductor junction with guard ring and epitaxial construction to minimize forward conduction loss while maintaining stable reverse leakage up to 100 °C. Its low R_ΘJC (15 °C/W) enables efficient heat transfer from junction to case under continuous 2.0 A operation.

The device exhibits 150 pF junction capacitance at 4.0 V reverse bias and 1 MHz, supporting high-frequency switching in flyback and boost topologies. Its 40 V V_RRM rating targets 12–24 V input systems where fast recovery and low VF are critical for efficiency.

Key Specifications

Pinout & Package

DO-15 molded plastic package with axial leads; cathode indicated by color band. Weight: 0.4 g. Mounting position: any orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB240-E3/54, SB240-A52 offers identical reliability and thermal performance with slightly higher VF; versus SS24, it delivers superior thermal management in legacy through-hole designs but lacks SMT flexibility.

Availability

SB240-A52 is available at Aetrix Electronics and suitable for automotive power protection, DC-DC converter freewheeling, and industrial 24 V PLC power rails requiring stable component supply and long-term manufacturability.

Supply support for SB240-A52 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 and signal integrity solutions.

The SB240-A52 belongs to Diodes' Schottky Rectifier product line, engineered for low-VF, high-reliability rectification in cost-sensitive 12–24 V power systems where thermal robustness and ESD immunity are essential.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The SB240-A52 has an operating junction temperature range of –55 to +150 °C. For continuous 2.0 A operation, thermal design must ensure T_j stays within this limit-typically achieved with R_ΘJA ≤ 45 °C/W and ambient ≤ 75 °C using standard DO-15 PCB pad layout.

Is SB240-A52 compatible with lead-free reflow soldering processes?

Yes. SB240-A52 features a lead-free finish and is RoHS 3 compliant (2015/863/EU). It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and withstands peak reflow temperatures up to 260 °C for 10 seconds, consistent with standard Pb-free solder profiles.

How does the 60 A surge rating translate to real-world reliability?

The 60 A I_FSM rating applies to a single 8.3 ms half-sine waveform at 60 Hz. In practice, this supports cold-start inrush currents in 12 V systems (e.g., motor drivers or capacitive-input supplies) without degradation, provided surge events remain infrequent and within datasheet-defined limits.

Can SB240-A52 replace a standard PN rectifier like 1N4007 in existing designs?

Yes, with caveats: SB240-A52 offers lower VF (0.55 V vs. ~0.9 V) and faster switching, improving efficiency-but its 40 V V_RRM is lower than 1N4007's 1000 V. Replacement is valid only in circuits where reverse voltage never exceeds 40 V, such as low-voltage DC outputs or battery protection paths.