SK15-LTP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK15-LTP is a Schottky rectifier diode rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Equivalent and substitute parts are necessary to support existing designs, provide design flexibility, and ensure supply chain continuity for applications requiring Schottky diode functionality in the 50 V / 1 A performance class or compatible current/voltage ratings.

Key Parameters

Parameter	SK15-LTP Value	Unit
Technology	Schottky	—
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)	—
Current - Reverse Leakage @ Vr	500 µA @ 50 V	µA
Capacitance @ Vr, F	90 pF @ 4V, 1MHz	pF
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK15-LTP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Package / Case: Must be DO-214AA, SMB (surface mount)
Technology: Schottky rectifier diode
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Operating Temperature Range: Must accommodate application requirements
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment
Moisture Sensitivity Level: MSL 1 (Unlimited) ensures handling compatibility

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (50 V / 1 A): Parts with identical voltage and current ratings that provide direct functional replacement with minimal design impact.

Category 2 - Functional Substitutes (50 V / Higher Current or Lower Voltage / 1 A): Parts with higher current ratings at 50 V or lower voltage ratings at 1 A that operate within the SK15-LTP electrical envelope and are electrically compatible for applications with design margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	RoHS
SK15-LTP	Micro Commercial Co	50	1	720 @ 1A	500 @ 50V	DO-214AA, SMB	-55 to 125	Not For New Designs	ROHS3
SK15-TP (SMBSR105)	Micro Commercial Co	50	1	720 @ 1A	500 @ 50V	DO-214AA, SMB	-55 to 125	Active	ROHS3
B150B-13-F	Diodes Incorporated	50	1	700 @ 1A	500 @ 50V	DO-214AA, SMB	-65 to 150	Active	ROHS3
B250-13-F	Diodes Incorporated	50	2	700 @ 2A	500 @ 50V	DO-214AA, SMB	-65 to 150	Active	ROHS3
B350B-13-F	Diodes Incorporated	50	3	700 @ 3A	500 @ 50V	DO-214AA, SMB	-55 to 150	Active	ROHS3
MBRS140T3G	onsemi	40	1	600 @ 1A	1000 @ 40V	DO-214AA, SMB	-65 to 125	Active	ROHS3
SK36B/TR13	Microsemi Corporation	60	3	750 @ 3A	500 @ 60V	DO-214AA, SMB	-55 to 125	Active	RoHS non-compliant
SS25	Taiwan Semiconductor Corporation	50	2	700 @ 2A	400 @ 50V	DO-214AA, SMB	-55 to 150	Active	ROHS3
STPS1L40U	STMicroelectronics	40	1	500 @ 1A	35 @ 40V	DO-214AA, SMB	—	Active	ROHS3
STPS2L40U	STMicroelectronics	40	2	430 @ 2A	220 @ 40V	DO-214AA, SMB	—	Active	ROHS3
STPS340U	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AA, SMB	—	Active	ROHS3

Engineering Selection Recommendations

Recommended Primary Substitute: SK15-TP (SMBSR105)

SK15-TP is the preferred substitute for SK15-LTP. Both parts are manufactured by Micro Commercial Co and share identical electrical specifications: 50 V reverse voltage, 1 A average rectified current, 720 mV forward voltage drop at 1 A, and identical operating temperature range (-55°C to 125°C). SK15-TP carries Active product status, ensuring continued availability and supply chain support. Both parts are ROHS3 Compliant and MSL 1 (Unlimited). This substitution requires no circuit redesign and provides direct functional replacement.

Recommended Secondary Substitutes: B150B-13-F, B250-13-F, B350B-13-F

These Diodes Incorporated parts maintain the 50 V reverse voltage rating and are ROHS3 Compliant with Active product status. B150B-13-F provides identical 1 A current rating with slightly lower forward voltage (700 mV vs. 720 mV at 1 A) and extended operating temperature range (-65°C to 150°C). B250-13-F and B350B-13-F offer higher current ratings (2 A and 3 A respectively) at 50 V, providing design margin for applications with potential current growth or thermal considerations. All three parts use DO-214AA, SMB packaging compatible with SK15-LTP footprints.

Alternative Substitutes: SS25

SS25 (Taiwan Semiconductor Corporation) provides 50 V / 2 A performance in DO-214AA, SMB package with ROHS3 Compliance and Active status. Forward voltage is 700 mV at 2 A with lower reverse leakage (400 µA @ 50 V vs. 500 µA). Operating temperature range extends to 150°C maximum. This part is suitable for applications requiring higher current capacity at the same voltage rating.

Limited Substitutes: MBRS140T3G, STPS1L40U, STPS2L40U, STPS340U

These parts operate at 40 V reverse voltage, which is below the SK15-LTP 50 V rating. Substitution is limited to applications where the actual operating voltage does not exceed 40 V and where the design includes sufficient voltage margin. MBRS140T3G (onsemi) and STPS1L40U (STMicroelectronics) both provide 1 A current at 40 V with improved forward voltage characteristics (600 mV and 500 mV respectively). STPS2L40U and STPS340U offer 2 A and 3 A ratings at 40 V. All are ROHS3 Compliant and Active status.

Not Recommended: SK36B/TR13

SK36B/TR13 (Microsemi Corporation) is rated for 60 V / 3 A and carries RoHS non-compliant status. While the higher voltage rating provides margin, the RoHS non-compliance status conflicts with modern regulatory requirements and supply chain standards. This part is not recommended for new applications or redesigns.

Frequently Asked Questions (FAQ)

Q: Can SK15-TP (SMBSR105) be used as a direct replacement for SK15-LTP?

A: Yes. SK15-TP is the direct equivalent substitute. Both parts share identical electrical specifications (50 V, 1 A, 720 mV Vf @ 1A), operating temperature range (-55°C to 125°C), and package type (DO-214AA, SMB). SK15-TP is Active status, making it the preferred choice for continued supply.

Q: What is the difference between B150B-13-F and SK15-LTP?

A: B150B-13-F maintains the same 50 V / 1 A electrical rating as SK15-LTP with slightly lower forward voltage (700 mV vs. 720 mV at 1 A). B150B-13-F offers an extended operating temperature range (-65°C to 150°C vs. -55°C to 125°C). Both use DO-214AA, SMB packaging and are ROHS3 Compliant. B150B-13-F is manufactured by Diodes Incorporated and carries Active product status.

Q: Can I use B250-13-F or B350B-13-F instead of SK15-LTP?

A: Yes, with design considerations. B250-13-F (2 A) and B350B-13-F (3 A) maintain the 50 V reverse voltage rating and use identical DO-214AA, SMB packaging. The higher current ratings provide design margin and thermal headroom for applications where current may increase or thermal performance is critical. Forward voltage drops are 700 mV at their respective rated currents. Both are ROHS3 Compliant and Active status.

Q: Why are MBRS140T3G and STPS1L40U listed as substitutes if they are rated for 40 V instead of 50 V?

A: These parts are listed as functional substitutes for applications where the actual operating reverse voltage does not exceed 40 V. The 40 V rating is lower than SK15-LTP's 50 V specification, so substitution is only appropriate when circuit design includes sufficient voltage margin and the maximum reverse voltage stress remains below 40 V. These parts offer improved forward voltage characteristics (600 mV and 500 mV respectively at 1 A) and are ROHS3 Compliant with Active status.

Q: Is SK36B/TR13 a suitable substitute?

A: SK36B/TR13 is not recommended. Although it provides higher voltage (60 V) and current (3 A) ratings, it carries RoHS non-compliant status. Modern supply chains and regulatory requirements favor ROHS3 Compliant components. The RoHS non-compliance status creates long-term supply chain risk and regulatory exposure.

Q: What packaging considerations apply to these substitutes?

A: All listed substitutes use DO-214AA (SMB) surface mount packaging, which is mechanically and electrically compatible with SK15-LTP. No PCB layout modifications are required. All parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.

Q: Which substitute offers the best forward voltage performance?

A: STPS1L40U (STMicroelectronics) provides the lowest forward voltage at 500 mV @ 1 A, followed by MBRS140T3G at 600 mV @ 1 A. However, both are rated for 40 V reverse voltage. Among 50 V rated parts, B150B-13-F, B250-13-F, B350B-13-F, and SS25 all provide 700 mV forward voltage, which is lower than SK15-LTP's 720 mV specification.

Q: Are all substitutes ROHS3 Compliant?

A: All substitutes except SK36B/TR13 are ROHS3 Compliant. SK36B/TR13 is RoHS non-compliant and is not recommended for new designs or applications requiring regulatory compliance.

Q: What is the inventory status of these substitutes?

A: SK15-TP has 867 pieces in stock. B150B-13-F has 3,135 pieces. B250-13-F has 18,186 pieces. B350B-13-F has 10,400 pieces. SS25 has 35,100 pieces. STPS2L40U has 90,300 pieces. STPS340U has 445,300 pieces. MBRS140T3G has 55,300 pieces. STPS1L40U has 7,900 pieces. SK36B/TR13 has 1,020 pieces. Inventory levels support immediate availability for most substitutes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message