MBRS340T3 Equivalent & Substitute Parts

Part Overview

The MBRS340T3 is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 4 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Equivalent parts maintain the same electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter tolerances for the intended application.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	2	mA @ 40 V
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MBRS340T3 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 4 A for direct equivalence; 3 A rated parts are acceptable substitutes with current derating consideration
Voltage - Forward (Vf) (Max) @ If: Must not exceed 500 mV @ 3 A for thermal and efficiency compatibility
Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: Must not exceed 2 mA @ 40 V for leakage compatibility

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount (required)
Package / Case: DO-214AB (SMC) or equivalent footprint-compatible packages (DO-214AC/SMA, DO-214AA/SMB, SOD-323)

Compliance Criteria:

RoHS Status: ROHS3 Compliant preferred for new designs
Technology: Schottky (required)

Substitute parts are grouped into two categories: direct electrical equivalents (matching 40 V / 3 A or higher ratings in SMC package) and package-variant substitutes (same electrical ratings in alternative surface mount packages).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Product Status	RoHS Status
MBRS340T3	onsemi	40	4	500 @ 3 A	DO-214AB, SMC	Obsolete	RoHS non-compliant
MBRS340T3G	onsemi	40	3	500 @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant
VS-MBRS340-M3/9AT	Vishay General Semiconductor - Diodes Division	40	3	525 @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant
SK34-TP	Micro Commercial Co	40	3	500 @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant
SK34_R1_00001	Panjit International Inc.	40	3	500 @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant
STPS340S	STMicroelectronics	40	3	630 @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant
SS34	MDD	40	3	—	DO-214AC, SMA	Active	ROHS3 Compliant
CDBB340-G	Comchip Technology	40	3	500 @ 3 A	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40	0.75	740 @ 750 mA	SC-76, SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs):

MBRS340T3G (onsemi) is the direct successor to the obsolete MBRS340T3. Both parts share identical electrical specifications (40 V, 500 mV forward voltage @ 3 A) and the same SMC package footprint. MBRS340T3G carries Active product status and ROHS3 compliance, making it the preferred choice for new designs and production transitions.

Alternative Substitutes (Same Package, Active Status):

SK34-TP (Micro Commercial Co) and SK34_R1_00001 (Panjit International Inc.) provide equivalent electrical performance in the DO-214AB SMC package with Active product status and ROHS3 compliance. Both maintain 40 V reverse voltage, 3 A current rating, and 500 mV forward voltage specifications.

VS-MBRS340-M3/9AT (Vishay General Semiconductor - Diodes Division) offers 40 V / 3 A performance in SMC package with Active status and ROHS3 compliance. Forward voltage is specified at 525 mV @ 3 A, representing a 25 mV increase over the original specification.

STPS340S (STMicroelectronics) provides 40 V / 3 A performance in SMC package with Active status and ROHS3 compliance. Forward voltage is specified at 630 mV @ 3 A, representing a 130 mV increase over the original specification. This higher forward voltage may impact thermal performance in current-limited applications.

Package-Variant Substitutes:

SS34 (MDD) offers 40 V / 3 A performance in DO-214AC SMA package with Active status and ROHS3 compliance. SMA package is smaller than SMC, requiring PCB layout modification.

CDBB340-G (Comchip Technology) provides 40 V / 3 A performance in DO-214AA SMB package with ROHS3 compliance. Product status is Not For New Designs, limiting suitability for new development.

Current-Derating Consideration:

All identified substitutes are rated for 3 A average rectified current, compared to the original 4 A rating. Applications requiring sustained 4 A operation require thermal analysis or selection of higher-rated alternatives. For applications operating below 3 A, substitutes provide direct compatibility.

Lower-Current Alternative:

BAT165E6327HTSA1 (Infineon Technologies) is a 40 V / 750 mA Schottky diode in SOD-323 package. This part is suitable only for applications with significantly reduced current requirements and requires PCB layout modification due to package change.

Frequently Asked Questions (FAQ)

Q: Can MBRS340T3G directly replace MBRS340T3 without PCB modification?

A: Yes. MBRS340T3G maintains identical electrical specifications and uses the same DO-214AB SMC package footprint as the original MBRS340T3. No PCB layout changes are required.

Q: What is the significance of the 3 A vs. 4 A current rating difference?

A: The original MBRS340T3 is rated for 4 A average rectified current. All identified active substitutes are rated for 3 A. For applications operating at or near 4 A continuously, thermal analysis is required to confirm adequate heat dissipation at the lower rating. For applications operating below 3 A, substitutes provide full compatibility.

Q: Are all substitute parts RoHS compliant?

A: The original MBRS340T3 is RoHS non-compliant. All identified active substitutes carry ROHS3 Compliant status, meeting current environmental regulations for new designs and production.

Q: Can I use SS34 (SMA package) as a substitute?

A: SS34 provides equivalent electrical performance (40 V, 3 A, Schottky technology) but uses DO-214AC SMA package instead of DO-214AB SMC. SMA is a smaller package requiring PCB footprint modification. Electrical compatibility is maintained; mechanical redesign is necessary.

Q: What is the impact of forward voltage variation among substitutes?

A: Forward voltage specifications range from 500 mV to 630 mV @ 3 A. Higher forward voltage increases power dissipation and heat generation. MBRS340T3G, SK34-TP, and SK34_R1_00001 maintain the original 500 mV specification. STPS340S at 630 mV represents a 26% increase in forward voltage drop, affecting thermal performance in high-current applications.

Q: Why is CDBB340-G marked "Not For New Designs"?

A: CDBB340-G carries product status "Not For New Designs," indicating onsemi or the manufacturer has designated this part for legacy support only. While electrically compatible, it is not recommended for new development. Active alternatives such as SK34-TP or MBRS340T3G are preferred.

Q: Can BAT165E6327HTSA1 replace MBRS340T3 in my application?

A: BAT165E6327HTSA1 is rated for only 750 mA average rectified current, compared to the original 4 A specification. This part is suitable only for applications with significantly reduced current requirements. Additionally, SOD-323 package requires PCB layout modification. Use this part only if application current requirements are below 750 mA.

Q: What reverse leakage current differences exist among substitutes?

A: Reverse leakage current @ 40 V varies among substitutes: MBRS340T3 and MBRS340T3G specify 2 mA; SK34-TP and CDBB340-G specify 500 µA; SK34_R1_00001 specifies 200 µA; STPS340S specifies 20 µA; SS34 specifies 500 µA. Lower leakage current reduces standby power consumption. STPS340S offers the lowest leakage at 20 µA.

Q: Are all substitutes rated for the same temperature range?

A: Operating temperature ranges vary. MBRS340T3G, SK34-TP, SK34_R1_00001, and VS-MBRS340-M3/9AT specify -55°C to 150°C. STPS340S and CDBB340-G specify maximum junction temperature of 150°C. SS34 specifies -55°C to 125°C. Verify temperature range compatibility with application requirements.

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