MBR1240MFST3G Equivalent & Substitute Parts

Part Overview

The MBR1240MFST3G is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 12 A average rectified current. This component is designed for surface mount applications in the 5-DFN (5x6) package configuration. The MBR1240MFST3G is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to support ongoing design requirements, procurement continuity, and system maintenance where this component is specified in existing applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	12 A
Voltage - Forward (Vf) (Max) @ If	680 mV @ 12 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Mounting Type	Surface Mount
Package / Case	8-PowerTDFN, 5 Leads
Supplier Device Package	5-DFN (5x6) (8-SOFL)
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MBR1240MFST3G are identified based on electrical and mechanical parameter equivalence. The critical parameters that determine substitution eligibility are:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 12 A
Voltage - Forward (Vf) (Max) @ If: 680 mV @ 12 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 40 V
Package / Case: 8-PowerTDFN, 5 Leads
Supplier Device Package: 5-DFN (5x6) (8-SOFL)
Operating Temperature - Junction: -55°C ~ 150°C

All substitute parts listed maintain identical electrical ratings and mechanical package specifications. Differences in product status and packaging format (Tape & Reel versus standard packaging) do not affect functional equivalence in circuit applications.

Parameter Comparison

Parameter	MBR1240MFST3G	NRVB1240MFST3G	NRVB1240MFST1G
Manufacturer	onsemi	onsemi	onsemi
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	12 A	12 A	12 A
Voltage - Forward (Vf) (Max) @ If	680 mV @ 12 A	680 mV @ 12 A	680 mV @ 12 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V	500 µA @ 40 V	500 µA @ 40 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-PowerTDFN, 5 Leads	8-PowerTDFN, 5 Leads	8-PowerTDFN, 5 Leads
Supplier Device Package	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

The MBR1240MFST3G is obsolete. Both NRVB1240MFST3G and NRVB1240MFST1G are active product alternatives from onsemi with identical electrical and mechanical specifications.

NRVB1240MFST3G provides direct substitution with active product status and equivalent compliance certifications (ROHS3 Compliant, REACH Unaffected, MSL 1).

NRVB1240MFST1G provides direct substitution with active product status, equivalent compliance certifications, and Tape & Reel packaging format. The Tape & Reel packaging is suitable for automated assembly processes and high-volume production environments.

Both substitute parts maintain full electrical equivalence across all specified parameters: 40 V reverse voltage rating, 12 A average rectified current, 680 mV forward voltage drop at 12 A, fast recovery switching characteristics, and identical thermal operating range (-55°C to 150°C junction temperature).

Frequently Asked Questions (FAQ)

Q: Can NRVB1240MFST3G or NRVB1240MFST1G be used as direct replacements for MBR1240MFST3G in existing circuit designs?

A: Yes. Both substitute parts are electrically and mechanically equivalent. All critical parameters including reverse voltage rating, forward current capacity, forward voltage drop, switching speed, reverse leakage current, and package configuration are identical.

Q: What is the difference between NRVB1240MFST3G and NRVB1240MFST1G?

A: The primary difference is packaging format. NRVB1240MFST1G is supplied in Tape & Reel format, which is standard for automated surface mount assembly. NRVB1240MFST3G packaging format is not specified in the provided data. Both parts have identical electrical specifications and are Active product status.

Q: Are there any compliance or regulatory differences between the main part and substitute parts?

A: No. All three parts are ROHS3 Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Compliance certifications are identical.

Q: Is the 5-DFN (5x6) package footprint identical across all three parts?

A: Yes. All three parts use the 8-PowerTDFN package with 5 leads and 5-DFN (5x6) (8-SOFL) supplier device package specification. PCB layout and assembly tooling are compatible.

Q: What is the operating temperature range for these diodes?

A: The junction operating temperature range is -55°C to 150°C for all three parts.

Q: Why is the MBR1240MFST3G listed as obsolete?

A: Product obsolescence is determined by the manufacturer. The NRVB1240 series represents the active product line continuation with equivalent specifications.

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