SMBSR105 Equivalent & Substitute Parts

Part Overview

The SMBSR105 is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part features fast recovery characteristics suitable for high-frequency switching applications with a maximum forward voltage of 720 mV at 1 A and reverse leakage current of 500 µA at 50 V.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	720 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 50 V
Technology	Schottky	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C

Substitute Part Grouping Explanation

Substitution of the SMBSR105 is determined by alignment of critical electrical and mechanical parameters. The primary substitution criteria are:

Parametric Equivalents (identical electrical ratings and package):

Voltage rating: 50 V DC reverse
Current rating: 1 A average rectified
Package: DO-214AA (SMB) surface mount
Forward voltage: 720 mV @ 1 A
Reverse leakage: 500 µA @ 50 V
Technology: Schottky with fast recovery ≤ 500ns

Parts meeting all these criteria are classified as direct parametric equivalents and provide identical electrical performance within the same physical footprint.

Similar Substitutes (different electrical ratings or packages):

Parts with higher voltage ratings (40 V to 45 V) or higher current ratings (3 A to 6 A)
Parts in alternative surface mount packages (DO-214AB, SMC)
These substitutes are suitable only when circuit design permits operation at reduced voltage margins or when higher current capacity is beneficial

The SMBSR105 is obsolete; therefore, active product status alternatives are prioritized for new designs and ongoing procurement.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Product Status	RoHS Status
SMBSR105	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA (SMB)	Obsolete	Non-compliant
SK15-TP	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA (SMB)	Active	ROHS3 Compliant
SK15-LTP	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA (SMB)	Not For New Designs	ROHS3 Compliant
SK645L-TP	Micro Commercial Co	45 V	6 A	650 mV @ 6 A	DO-214AB (SMC)	Active	Not specified
SK64L-TP	Micro Commercial Co	40 V	6 A	650 mV @ 6 A	DO-214AB (SMC)	Not For New Designs	ROHS3 Compliant
STPS340SY	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AB (SMC)	Active	ROHS3 Compliant
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AB (SMC)	Active	ROHS3 Compliant
STPS3L40S	STMicroelectronics	40 V	3 A	500 mV @ 3 A	DO-214AB (SMC)	Active	ROHS3 Compliant
STPS3L40SY	STMicroelectronics	40 V	3 A	500 mV @ 3 A	DO-214AB (SMC)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SK15-TP

The SK15-TP is the optimal direct replacement for the SMBSR105. This part is manufactured by Micro Commercial Co and provides identical electrical specifications: 50 V reverse voltage rating, 1 A average rectified current, 720 mV forward voltage at 1 A, and the same DO-214AA (SMB) package footprint. The SK15-TP holds active product status and is ROHS3 compliant, making it suitable for new designs and long-term procurement. The part is currently in stock with 867 units available.

Secondary Recommendation: SK15-LTP

The SK15-LTP is a parametric equivalent with identical electrical ratings and package specifications. However, this part is classified as "Not For New Designs," limiting its application to legacy system maintenance or replacement scenarios. It is ROHS3 compliant and available in stock (1312 units).

Alternative Substitutes for Higher Current Applications:

When circuit design permits operation at reduced voltage margins or when higher current capacity is required:

SK645L-TP (Micro Commercial Co): 45 V, 6 A, DO-214AB (SMC) package, active status
STPS340SY (STMicroelectronics): 40 V, 3 A, DO-214AB (SMC) package, active status, automotive qualified (AEC-Q101)
STPS3L40SY (STMicroelectronics): 40 V, 3 A, DO-214AB (SMC) package, active status, automotive qualified, improved forward voltage (500 mV @ 3 A)

These alternatives require PCB layout modification due to package change from SMB to SMC (DO-214AB).

Not Recommended for New Designs:

SK64L-TP: Classified as "Not For New Designs"
STPS340S: Non-automotive variant; STPS340SY preferred for consistency

Frequently Asked Questions (FAQ)

Q: Can SK15-TP be used as a direct replacement for SMBSR105 without PCB modification?

A: Yes. The SK15-TP is a parametric equivalent with identical electrical specifications and the same DO-214AA (SMB) package footprint. No PCB layout changes are required.

Q: What is the difference between SK15-TP and SK15-LTP?

A: Both parts have identical electrical ratings and package specifications. The primary difference is product status: SK15-TP is active and recommended for new designs, while SK15-LTP is classified as "Not For New Designs." Both are ROHS3 compliant.

Q: Can SK645L-TP or SK64L-TP be used as substitutes?

A: These parts have higher current ratings (6 A) but lower voltage ratings (45 V and 40 V respectively) compared to the SMBSR105 (50 V, 1 A). They use a different package (DO-214AB, SMC) requiring PCB redesign. Substitution is possible only if the circuit design permits operation at the reduced voltage margin and the SMC package footprint is accommodated.

Q: What is the difference between STPS340SY and STPS340S?

A: Both parts have identical electrical specifications (40 V, 3 A, 630 mV forward voltage). STPS340SY includes automotive qualification (AEC-Q101) and extended operating temperature range (-40°C to 150°C), while STPS340S has a maximum junction temperature of 150°C without automotive certification. Both are active products and ROHS3 compliant.

Q: Why is the SMBSR105 classified as obsolete?

A: The SMBSR105 is no longer in active production. The SK15-TP serves as the active equivalent replacement from the same manufacturer with identical specifications.

Q: Can STPS3L40S or STPS3L40SY be used instead of STPS340S?

A: Yes, with design consideration. Both parts have the same voltage and current ratings (40 V, 3 A) and package (DO-214AB, SMC). However, STPS3L40S and STPS3L40SY feature improved forward voltage characteristics (500 mV @ 3 A versus 630 mV @ 3 A), resulting in lower power dissipation. STPS3L40SY includes automotive qualification. All three are active products and ROHS3 compliant.

Q: What is the impact of package change from SMB (DO-214AA) to SMC (DO-214AB)?

A: The SMC package is physically larger than SMB. PCB layout modification is required, including pad size and spacing adjustments. Thermal performance may improve due to increased package size and surface area. Mechanical clearance verification is necessary before implementation.

Q: Are all substitute parts RoHS compliant?

A: The SMBSR105 is RoHS non-compliant. All recommended substitutes (SK15-TP, SK15-LTP, and STMicroelectronics parts) are ROHS3 compliant, meeting current environmental regulations.

Q: What is the operating temperature range difference between SMBSR105 and its substitutes?

A: The SMBSR105 operates from -55°C to 125°C. SK15-TP and SK15-LTP maintain the same range. STMicroelectronics automotive variants (STPS340SY, STPS3L40SY) extend the lower limit to -40°C and upper limit to 150°C, providing wider operating margins in extreme temperature environments.

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