SK14-TP Equivalent & Substitute Parts

Part Overview

The SK14-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 1 A average rectified current in a DO-214AA (SMB) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain electrical performance within the specified parameter ranges while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 1 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 40 V	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55°C ~ 125°C	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SK14-TP are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 1 A minimum
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical & Package Compatibility:

Mounting Type: Surface Mount
Package / Case: DO-214AA, SMB

Compliance & Environmental:

RoHS Status: ROHS3 Compliant (preferred)
Moisture Sensitivity Level (MSL): 1 (Unlimited)
Operating Temperature Range: Must accommodate -55°C to 125°C minimum

Parts are grouped as parametric equivalents or similar alternatives based on adherence to these criteria. Forward voltage (Vf) and reverse leakage current (Ir) variations within acceptable engineering tolerances do not disqualify substitution when all primary parameters are met.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Ir @ 40V [µA]	Speed	Package	Tj Range [°C]	Product Status	RoHS
SK14-TP	Micro Commercial Co	40	1	600	500	Fast Recovery ≤ 500ns	DO-214AA, SMB	-55 ~ 125	Obsolete	ROHS3
SK14-TP (SMB5819)	Micro Commercial Co	40	1	600	500	Fast Recovery ≤ 500ns	DO-214AA, SMB	-55 ~ 125	Active	ROHS3
5819SMJ/TR13	Microchip Technology	40	1	550	1000	Fast Recovery ≤ 500ns	DO-214AA, SMB	-55 ~ 150	Active	Non-compliant
B140B-13-F	Diodes Incorporated	40	1	500	500	Fast Recovery ≤ 500ns	DO-214AA, SMB	-65 ~ 150	Active	ROHS3
B140HB-13-F	Diodes Incorporated	40	1	530	100	Fast Recovery ≤ 500ns	DO-214AA, SMB	-55 ~ 150	Active	ROHS3
MBRS140T3G	onsemi	40	1	600	1000	Fast Recovery ≤ 500ns	DO-214AA, SMB	-65 ~ 125	Active	ROHS3
STPS140U	STMicroelectronics	40	1	550	12	Fast Recovery ≤ 500ns	DO-214AA, SMB	-55 ~ 150	Active	ROHS3
STPS1L40UY	STMicroelectronics	40	1	500	35	Fast Recovery ≤ 500ns	DO-214AA, SMB	-40 ~ 150	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: SK14-TP (SMB5819)

The SK14-TP (SMB5819) variant from Micro Commercial Co is the direct parametric equivalent with active product status. This part maintains identical electrical specifications to the original SK14-TP while offering current manufacturing availability. ROHS3 compliance and unlimited moisture sensitivity rating ensure compatibility with modern assembly processes.

Secondary Recommendations (Diodes Incorporated):

B140B-13-F and B140HB-13-F from Diodes Incorporated are active alternatives with ROHS3 compliance. Both parts meet all electrical requirements with forward voltage specifications within acceptable ranges (500 mV and 530 mV respectively). B140HB-13-F offers superior reverse leakage characteristics (100 µA @ 40 V) compared to the original specification. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin.

Tertiary Recommendations (STMicroelectronics):

STPS140U and STPS1L40UY from STMicroelectronics meet all electrical and package requirements with ROHS3 compliance. STPS140U exhibits exceptionally low reverse leakage (12 µA @ 40 V). STPS1L40UY includes automotive-grade qualification and operates across -40°C to 150°C, suitable for extended temperature applications.

Alternative (onsemi):

MBRS140T3G from onsemi satisfies all primary electrical parameters with ROHS3 compliance and high inventory availability (55,300 pcs). Forward voltage matches the original specification (600 mV @ 1 A).

Non-Recommended:

5819SMJ/TR13 from Microchip Technology does not meet RoHS compliance requirements and is not recommended for new designs requiring ROHS3 certification.

Frequently Asked Questions (FAQ)

Q: Can SK14-TP be directly replaced with SK14-TP (SMB5819)?

A: Yes. SK14-TP (SMB5819) is the active production equivalent with identical electrical specifications, package configuration, and compliance certifications. This is the preferred direct replacement.

Q: What is the primary difference between B140B-13-F and B140HB-13-F?

A: Both parts meet electrical requirements. B140HB-13-F offers lower reverse leakage current (100 µA vs. 500 µA @ 40 V) and is supplied in Tape & Reel packaging, while B140B-13-F is available in Cut Tape & Digi-Reel format. Selection depends on packaging requirements and leakage specifications for the application.

Q: Are all substitute parts ROHS3 compliant?

A: No. The 5819SMJ/TR13 from Microchip Technology is RoHS non-compliant and should not be used in applications requiring ROHS3 certification. All other listed substitutes are ROHS3 compliant.

Q: What is the operating temperature range consideration for substitution?

A: The original SK14-TP operates from -55°C to 125°C. Most substitute parts extend this range to -55°C or -65°C minimum and 150°C maximum, providing additional thermal margin. STPS1L40UY operates from -40°C to 150°C, which is acceptable for most applications but may not cover extreme low-temperature requirements below -40°C.

Q: How do forward voltage differences affect substitution?

A: Forward voltage specifications range from 500 mV to 600 mV @ 1 A across all qualified substitutes. These variations are within normal Schottky diode manufacturing tolerances and do not prevent functional substitution. Circuit design should account for the specified maximum forward voltage of the selected part.

Q: Is reverse leakage current critical for substitution?

A: Reverse leakage varies significantly across substitutes (12 µA to 1000 µA @ 40 V). For most rectification applications, this variation is acceptable. Applications requiring minimal leakage current should prioritize STPS140U (12 µA) or B140HB-13-F (100 µA).

Q: Can STPS1L40UY be used in automotive applications?

A: Yes. STPS1L40UY carries automotive-grade qualification and meets all electrical requirements. This part is suitable for automotive and industrial applications requiring extended temperature operation to 150°C.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and standard SMB configurations. All maintain the DO-214AA, SMB physical package for PCB compatibility. Packaging selection depends on assembly process requirements and volume.

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