SK25-LTP Equivalent & Substitute Parts

Part Overview

The SK25-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 2 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 40 V to 50 V, 2 A performance class.

Key Parameters

Parameter	SK25-LTP Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 50 V
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK25-LTP is determined by the following critical parameters:

Voltage Rating: The reverse voltage rating must equal or exceed 50 V to maintain circuit protection and reliability. Parts rated at 40 V are acceptable only in applications where the maximum reverse voltage does not exceed 40 V.

Current Rating: The average rectified current must equal or exceed 2 A to handle the specified load without thermal stress or performance degradation.

Forward Voltage Drop: Forward voltage characteristics at 2 A determine power dissipation and circuit efficiency. Variations in Vf are acceptable within normal engineering tolerances for Schottky diodes.

Package Compatibility: All substitute parts must use the DO-214AA (SMB) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Technology: All substitutes employ Schottky technology, maintaining the fast recovery characteristics (≤ 500ns) required for rectification applications.

Compliance: RoHS3 compliance and MSL 1 rating are maintained across all substitute options.

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (50 V Rating): Parts with 50 V reverse voltage rating provide direct functional replacement with identical voltage performance.

Category B - Reduced Voltage Alternatives (40 V Rating): Parts with 40 V reverse voltage rating are suitable for applications where circuit design permits operation at lower voltage margins.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 2A [mV]	Ir @ Vr [µA/mA]	Package	Temp Range [°C]	Product Status
SK25-LTP	Micro Commercial Co	50	2	700	1 mA @ 50V	DO-214AA, SMB	-55 ~ 125	Not For New Designs
B250-13-F	Diodes Incorporated	50	2	700	500 µA @ 50V	DO-214AA, SMB	-65 ~ 150	Active
B250Q-13	Diodes Incorporated	50	2	700	500 µA @ 50V	DO-214AA, SMB	-65 ~ 150	Active
SS25	Taiwan Semiconductor Corporation	50	2	700	400 µA @ 50V	DO-214AA, SMB	-55 ~ 150	Active
SS25-E3/52T	Vishay General Semiconductor	50	2	700	400 µA @ 50V	DO-214AA, SMB	-65 ~ 125	Active
SS25-E3/5BT	Vishay General Semiconductor	50	2	700	400 µA @ 50V	DO-214AA, SMB	-65 ~ 125	Active
B240Q-13-F	Diodes Incorporated	40	2	500	500 µA @ 40V	DO-214AA, SMB	-65 ~ 150	Active
MBRS2040LT3G	onsemi	40	2	430	800 µA @ 40V	DO-214AA, SMB	-55 ~ 125	Active
MBRS240LT3G	onsemi	40	2	430	2 mA @ 40V	DO-214AA, SMB	-55 ~ 150	Active
SS24T3G	onsemi	40	2	500	400 µA @ 40V	DO-214AA, SMB	-55 ~ 150	Active
STPS140U	STMicroelectronics	40	1	550	12 µA @ 40V	DO-214AA, SMB	—	Active

Engineering Selection Recommendations

For Direct Replacement (50 V Applications):

Parts B250-13-F, B250Q-13, SS25, SS25-E3/52T, and SS25-E3/5BT provide electrical equivalence to the SK25-LTP with 50 V reverse voltage rating. All are classified as Active products with current manufacturing support. B250Q-13 carries AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability documentation. SS25-E3/52T and SS25-E3/5BT are supplied by Vishay with extended temperature range support (-65°C to 125°C). SS25 from Taiwan Semiconductor Corporation offers the widest operating temperature range (-55°C to 150°C) among 50 V options.

For Reduced Voltage Applications (40 V Maximum):

Parts B240Q-13-F, MBRS2040LT3G, MBRS240LT3G, and SS24T3G are suitable only for circuits where the maximum reverse voltage does not exceed 40 V. B240Q-13-F includes AEC-Q101 automotive qualification. MBRS2040LT3G and MBRS240LT3G from onsemi offer lower forward voltage drop (430 mV @ 2 A) compared to the SK25-LTP (700 mV @ 2 A), resulting in reduced power dissipation. SS24T3G provides balanced performance with 500 mV forward voltage drop and wide temperature range (-55°C to 150°C).

Not Recommended:

STPS140U is rated for 1 A average rectified current, below the 2 A requirement of the SK25-LTP, and is unsuitable for direct substitution in applications requiring 2 A performance.

Compliance Considerations:

All recommended substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original SK25-LTP specifications.

Frequently Asked Questions (FAQ)

Q: Can I use a 40 V rated diode in place of the SK25-LTP (50 V rated)?

A: A 40 V rated diode can be used only if the circuit design ensures that the maximum reverse voltage applied to the diode does not exceed 40 V. If the circuit is designed for 50 V operation, a 40 V diode will not provide adequate voltage margin and may fail prematurely. Use 50 V rated substitutes (B250-13-F, B250Q-13, SS25, SS25-E3/52T, SS25-E3/5BT) for direct replacement.

Q: What is the difference between B250-13-F and B250Q-13?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications (50 V, 2 A, 700 mV forward voltage). B250Q-13 includes AEC-Q101 automotive qualification, indicating compliance with automotive reliability and testing standards. B250-13-F is the standard industrial grade version. Select B250Q-13 for automotive applications requiring qualification documentation.

Q: Why do some substitute parts have lower forward voltage drops?

A: Forward voltage drop varies based on semiconductor manufacturing process and die design. MBRS2040LT3G and MBRS240LT3G exhibit 430 mV forward voltage drop compared to 700 mV for the SK25-LTP. Lower forward voltage reduces power dissipation and heat generation, improving circuit efficiency. This is an engineering advantage in applications where thermal management is critical.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the SK25-LTP.

Q: What does "Not For New Designs" mean for the SK25-LTP?

A: "Not For New Designs" indicates the SK25-LTP has reached end-of-life status and is no longer recommended for new product development. Existing inventory may be available, but long-term supply is not guaranteed. For new designs, select from Active status alternatives such as B250-13-F, B250Q-13, SS25, SS25-E3/52T, or SS25-E3/5BT.

Q: Can I use STPS140U as a substitute?

A: No. STPS140U is rated for 1 A average rectified current, while the SK25-LTP is rated for 2 A. Using a 1 A diode in a 2 A application will cause excessive current stress, thermal runaway, and component failure. Use only 2 A rated substitutes.

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

A: The SK25-LTP operates from -55°C to 125°C. Most substitute parts extend the upper temperature limit to 150°C (B250-13-F, B250Q-13, SS25, MBRS240LT3G, SS24T3G). Some extend the lower limit to -65°C (B250-13-F, B250Q-13, SS25-E3/52T, SS25-E3/5BT). Extended temperature ranges provide design margin for harsh environment applications.

Q: Is RoHS3 compliance maintained across all substitutes?

A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the SK25-LTP and current environmental regulations.

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