MBRAF440T3G Equivalent & Substitute Parts

Part Overview

The MBRAF440T3G is an active Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 4 A average rectified current in a surface mount SMA-FL package. This component is designed for fast recovery applications with switching speeds ≤ 500 ns at currents > 200 mA. The part is ROHS3 compliant, REACH unaffected, and carries unlimited moisture sensitivity level (MSL 1), making it suitable for standard manufacturing and storage conditions. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications required for circuit functionality.

Substiute Parts

MBRAF440T3G

onsemiIn Stock: 54007MBRAF440T3G Datasheet

Current PartRFQ

SS14FL-TP

Micro Commercial CoIn Stock: 35785SS14FL-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MBRAF440T3G is determined by the following critical parameters:

Voltage Rating: The substitute part must support a minimum DC reverse voltage (Vr) of 40 V to maintain circuit protection and reliability.

Current Rating: The substitute part must support the average rectified current (Io) required by the application. The MBRAF440T3G is rated for 4 A; substitute parts with lower current ratings are not direct equivalents and require circuit redesign validation.

Package Compatibility: Both the main part and substitute must use the DO-221AC (SMA-FL) surface mount package to ensure mechanical and thermal compatibility with existing PCB layouts.

Technology: Schottky diode technology is required to maintain fast recovery characteristics (≤ 500 ns) and forward voltage performance.

Compliance & Environmental: Substitute parts must maintain ROHS3 compliance and MSL 1 rating to ensure manufacturing compatibility and long-term reliability.

The SS14FL-TP from Micro Commercial Co shares the same package, voltage rating, technology, and compliance certifications. However, its current rating of 1 A is lower than the MBRAF440T3G's 4 A rating, which restricts its use to applications with reduced current requirements.

Parameter Comparison

Engineering Selection Recommendations

MBRAF440T3G (Primary Part): This part is the specified component for applications requiring 4 A rectified current at 40 V reverse voltage. It is active, ROHS3 compliant, and carries MSL 1 rating. Use this part for all designs where the full 4 A current capacity is required.

SS14FL-TP (Substitute Part): This part is suitable only for applications where the average rectified current requirement does not exceed 1 A. While it shares the same package, voltage rating, fast recovery speed, and compliance certifications as the MBRAF440T3G, its reduced current rating and higher reverse leakage current (500 µA vs. 300 µA) make it unsuitable for direct replacement in circuits designed for the full 4 A capacity. Both parts are active and ROHS3 compliant, ensuring manufacturing compatibility. The SS14FL-TP is appropriate for lower-power variants of the same circuit topology or for new designs with reduced current specifications.

Frequently Asked Questions (FAQ)

Q: Can the SS14FL-TP be used as a direct replacement for the MBRAF440T3G?

A: No. While both parts share the same package (DO-221AC, SMA-FL), voltage rating (40 V), and fast recovery speed (≤ 500 ns), the SS14FL-TP is rated for only 1 A average rectified current compared to the MBRAF440T3G's 4 A rating. Direct substitution is only valid if the circuit current requirement does not exceed 1 A.

Q: What are the key differences between these two parts?

A: The primary differences are current rating (4 A vs. 1 A) and reverse leakage current (300 µA vs. 500 µA at 40 V). Both parts use Schottky technology, operate across -55 to 150 °C, and are packaged in DO-221AC (SMA-FL). Forward voltage characteristics are comparable at their respective rated currents.

Q: Are both parts suitable for the same PCB layout?

A: Yes. Both parts use the DO-221AC (SMA-FL) surface mount package with identical mechanical dimensions and lead configuration. PCB footprints are interchangeable from a physical standpoint. However, thermal design considerations may differ due to the current rating difference.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the MBRAF440T3G and SS14FL-TP are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level). They are suitable for standard manufacturing and storage environments.

Q: What is the impact of the higher reverse leakage current in the SS14FL-TP?

A: The SS14FL-TP exhibits 500 µA reverse leakage at 40 V compared to 300 µA for the MBRAF440T3G. This difference may affect circuit performance in applications sensitive to leakage current, such as precision analog circuits or low-power standby modes. Evaluate leakage impact based on specific circuit requirements.

Q: Can the MBRAF440T3G be used in place of the SS14FL-TP?

A: Yes. The MBRAF440T3G can be used in any application designed for the SS14FL-TP, as it provides higher current capacity (4 A vs. 1 A) and lower reverse leakage (300 µA vs. 500 µA). No circuit redesign is required; however, thermal and cost considerations may apply.