MBRD640CT Equivalent & Substitute Parts

Part Overview

The MBRD640CT is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with 40 V reverse voltage rating and 3 A average rectified current per diode. The device is packaged in TO-252-3 DPAK surface mount configuration and is part of the SWITCHMODE™ series.

The MBRD640CT carries an obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing production requirements, design updates, and inventory management for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io) (per Diode)	3	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 3 A	mV @ A
Technology	Schottky	—
Diode Configuration	1 Pair Common Cathode	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100 µA @ 40 V	µA @ V
Operating Temperature - Junction	-65°C ~ 175°C	°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MBRD640CT is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount
Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io) (per Diode): 3 A minimum
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Parameter Variations:

Forward Voltage (Vf): Acceptable within ±100 mV of 700 mV @ 3 A
Reverse Leakage Current: Acceptable at or below 100 µA @ 40 V
Operating Temperature Range: May exceed the original -65°C ~ 175°C specification
RoHS Compliance: May differ from original non-compliant status

Substitute parts are grouped into three categories:

Direct Equivalents (Active Status): Parts with identical electrical specifications and active product status, suitable for new designs and ongoing production.
Parametric Equivalents (Obsolete Status): Parts with identical electrical specifications but obsolete product status, available for legacy support only.
Higher-Rated Substitutes: Parts with voltage or current ratings exceeding the original specification, compatible within the same package and configuration.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [mV @ A]	Reverse Leakage @ Vr [µA @ V]	Tj (Operating) [°C]	Product Status	RoHS Status
MBRD640CT	onsemi	40	3	700 @ 3	100 @ 40	-65 ~ 175	Obsolete	Non-compliant
MBRD640CTT4G	onsemi	40	3	700 @ 3	100 @ 40	-65 ~ 175	Active	ROHS3 Compliant
RB085BM-40TL	Rohm Semiconductor	45	10	550 @ 5	200 @ 40	—	Not For New Designs	ROHS3 Compliant
RB095BM-40FHTL	Rohm Semiconductor	40	6	550 @ 3	100 @ 40	-40 ~ 150	Active	ROHS3 Compliant
STPS640CB-TR	STMicroelectronics	40	3	630 @ 3	100 @ 40	-40 ~ 150	Active	ROHS3 Compliant
STPS640CBY-TR	STMicroelectronics	40	3	630 @ 3	100 @ 40	-40 ~ 150	Active	ROHS3 Compliant
VS-MBRD650CT-M3	Vishay General Semiconductor - Diodes Division	50	3	700 @ 3	100 @ 50	-40 ~ 150	Active	ROHS3 Compliant
NRVBD640CTG	onsemi	40	3	700 @ 3	100 @ 40	-65 ~ 175	Obsolete	ROHS3 Compliant
NRVBD640CTG-VF01	onsemi	40	3	700 @ 3	100 @ 40	-65 ~ 175	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MBRD640CTT4G

The MBRD640CTT4G is the direct equivalent of the MBRD640CT with identical electrical specifications and package configuration. This part carries active product status and ROHS3 compliance, making it the preferred choice for new production and design updates. The part is available in high volume (50,333 pcs in stock) and maintains full compatibility with existing designs.

Secondary Recommendations: STPS640CB-TR and STPS640CBY-TR

Both STMicroelectronics parts (STPS640CB-TR and STPS640CBY-TR) provide equivalent electrical performance with 40 V reverse voltage and 3 A current rating. The STPS640CBY-TR variant includes automotive qualification (AEC-Q101) and extended temperature range (-40°C ~ 150°C). Forward voltage is 630 mV @ 3 A, which is 70 mV lower than the original specification, resulting in improved efficiency. Both parts carry active product status and ROHS3 compliance.

Alternative for Higher Voltage Applications: VS-MBRD650CT-M3

The VS-MBRD650CT-M3 from Vishay provides a 50 V reverse voltage rating while maintaining 3 A current capacity and identical forward voltage characteristics (700 mV @ 3 A). This part is suitable for applications requiring higher voltage margin. The part carries active product status and ROHS3 compliance.

Higher Current Alternative: RB095BM-40FHTL

The RB095BM-40FHTL from Rohm Semiconductor provides doubled current capacity (6 A per diode) at the same 40 V voltage rating. This part includes automotive qualification (AEC-Q101) and carries active product status. Forward voltage is 550 mV @ 3 A, providing improved efficiency. This part is suitable for applications requiring higher current handling capability.

Obsolete Alternatives: NRVBD640CTG and NRVBD640CTG-VF01

Both onsemi NRVBD640 variants provide identical electrical specifications to the MBRD640CT with ROHS3 compliance. These parts carry obsolete product status and are available only for legacy support (949 and 763 pcs in stock, respectively).

Frequently Asked Questions (FAQ)

Q: Can MBRD640CTT4G be used as a direct replacement for MBRD640CT?

A: Yes. The MBRD640CTT4G is a direct equivalent with identical electrical specifications, package configuration, and diode array topology. The primary difference is active product status and ROHS3 compliance. No design modifications are required.

Q: What is the difference between STPS640CB-TR and STPS640CBY-TR?

A: Both parts have identical electrical specifications and package configuration. The STPS640CBY-TR includes automotive qualification (AEC-Q101) and operates over -40°C ~ 150°C, while STPS640CB-TR operates over the same temperature range. The STPS640CBY-TR is specified for automotive applications.

Q: Can RB095BM-40FHTL be used in place of MBRD640CT?

A: Yes, with design consideration. The RB095BM-40FHTL provides doubled current capacity (6 A vs. 3 A) at the same 40 V voltage rating and identical package. Forward voltage is 550 mV @ 3 A compared to 700 mV, resulting in lower power dissipation. The part is suitable for applications where higher current capability is beneficial or required.

Q: Is VS-MBRD650CT-M3 compatible with MBRD640CT?

A: Yes. The VS-MBRD650CT-M3 maintains identical current rating (3 A) and package configuration with a higher voltage rating (50 V vs. 40 V). This part is suitable for applications requiring higher voltage margin or operating in higher voltage environments. Forward voltage characteristics are identical (700 mV @ 3 A).

Q: Why does the MBRD640CT show RoHS non-compliant status?

A: The MBRD640CT is an obsolete part manufactured prior to RoHS3 compliance requirements. Equivalent active parts such as MBRD640CTT4G, STPS640CB-TR, STPS640CBY-TR, and VS-MBRD650CT-M3 all carry ROHS3 compliance status.

Q: What is the difference between NRVBD640CTG and NRVBD640CTG-VF01?

A: Both parts have identical electrical specifications and package configuration. The NRVBD640CTG-VF01 designation indicates a forward voltage selection variant. Both parts carry obsolete product status and are available only for legacy support.

Q: Can I use a higher voltage rated part like VS-MBRD650CT-M3 in a 40 V application?

A: Yes. The VS-MBRD650CT-M3 with 50 V rating is fully compatible in 40 V applications. The higher voltage rating provides additional safety margin and does not affect circuit operation. All other electrical parameters remain equivalent to the MBRD640CT.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain the TO-252-3 DPAK surface mount package configuration. Packaging variations include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Tube formats. Selection depends on production volume and assembly requirements.

Q: Are there automotive-qualified alternatives to MBRD640CT?

A: Yes. Both RB095BM-40FHTL and STPS640CBY-TR carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring qualified components.

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