STPS140UY Equivalent & Substitute Parts

Part Overview

The STPS140UY is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount SMB (DO-214AA) package. This component is classified as Active product status and is RoHS3 compliant with automotive grade qualification. Alternative equivalent parts are necessary when the primary part experiences supply constraints, when different packaging formats are required, or when design specifications allow for higher current ratings or voltage ratings within the same application envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	12	µA @ 40 V
Technology	Schottky	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-40 to 150	°C
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—

Substitute Part Grouping Explanation

Substitution of the STPS140UY is determined by the following critical parameters:

Voltage Rating (Vr): Substitute parts must have a DC reverse voltage rating equal to or greater than 40 V. Parts rated at 50 V are acceptable as they provide additional voltage margin.

Current Rating (Io): Substitute parts must have an average rectified current rating equal to or greater than 1 A. Parts rated at 2 A or 3 A are acceptable as they provide additional current capacity.

Technology: All substitutes must use Schottky diode technology to maintain fast recovery characteristics and low forward voltage drop.

Package Type: The STPS140UY uses DO-214AA (SMB) surface mount package. Substitutes in DO-214AA (SMB) or DO-214AC (SMA) packages are mechanically compatible with appropriate PCB layout considerations.

Speed Characteristic: All substitutes must maintain fast recovery speed of ≤ 500ns at > 200mA to preserve circuit performance.

Compliance: All substitutes must maintain RoHS3 compliance and automotive grade qualification where applicable.

Substitute parts are grouped into three categories: Direct Equivalents (identical voltage and current ratings), Higher Current Ratings (same voltage, increased current capacity), and Higher Voltage Ratings (increased voltage margin, same or higher current).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Reverse Leakage @ Vr	Operating Temp	RoHS Status
STPS140UY	STMicroelectronics	40 V	1 A	650 mV @ 2 A	DO-214AA, SMB	12 µA @ 40 V	-40 to 150°C	ROHS3
SK14	Good-Ark Semiconductor	40 V	1 A	500 mV @ 1 A	DO-214AC, SMA	200 µA @ 40 V	-55 to 150°C	ROHS3
B140B-13-F	Diodes Incorporated	40 V	1 A	500 mV @ 1 A	DO-214AA, SMB	500 µA @ 40 V	-65 to 150°C	ROHS3
B140HB-13-F	Diodes Incorporated	40 V	1 A	530 mV @ 1 A	DO-214AA, SMB	100 µA @ 40 V	-55 to 150°C	ROHS3
B150B-13-F	Diodes Incorporated	50 V	1 A	700 mV @ 1 A	DO-214AA, SMB	500 µA @ 50 V	-65 to 150°C	ROHS3
B240-13-F	Diodes Incorporated	40 V	2 A	500 mV @ 2 A	DO-214AA, SMB	500 µA @ 40 V	-65 to 150°C	ROHS3
B250-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	500 µA @ 50 V	-65 to 150°C	ROHS3
B340B-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AA, SMB	500 µA @ 40 V	-55 to 150°C	ROHS3
B340LB-13-F	Diodes Incorporated	40 V	3 A	450 mV @ 3 A	DO-214AA, SMB	2 mA @ 40 V	-55 to 125°C	ROHS3
B350B-13-F	Diodes Incorporated	50 V	3 A	700 mV @ 3 A	DO-214AA, SMB	500 µA @ 50 V	-55 to 150°C	ROHS3
CDBB240-G	Comchip Technology	40 V	2 A	500 mV @ 2 A	DO-214AA, SMB	500 µA @ 40 V	-55 to 125°C	ROHS3

Engineering Selection Recommendations

Direct Equivalents (40 V, 1 A Rating):

The B140B-13-F and B140HB-13-F from Diodes Incorporated are direct functional equivalents to the STPS140UY. Both maintain the 40 V reverse voltage and 1 A current rating in the DO-214AA SMB package. The B140HB-13-F offers lower reverse leakage current (100 µA versus 500 µA) and is packaged in Tape & Reel format, matching the STPS140UY packaging type. The B140B-13-F is available in Cut Tape & Digi-Reel format with higher inventory availability.

The SK14 from Good-Ark Semiconductor is a direct equivalent with identical voltage and current ratings but uses the DO-214AC (SMA) package, which requires PCB layout modification. This part carries AEC-Q101 automotive qualification and offers extended temperature range (-55 to 150°C).

Higher Current Capacity (40 V, 2 A or 3 A Rating):

The B240-13-F (40 V, 2 A) and B340B-13-F (40 V, 3 A) maintain the 40 V reverse voltage rating while providing increased current capacity. These parts are suitable for applications where the circuit design permits higher current handling. The B340LB-13-F offers the lowest forward voltage drop (450 mV @ 3 A) among 40 V rated parts.

Higher Voltage Margin (50 V Rating):

The B150B-13-F (50 V, 1 A), B250-13-F (50 V, 2 A), and B350B-13-F (50 V, 3 A) provide increased reverse voltage rating while maintaining or exceeding current capacity. These parts are suitable for applications requiring additional voltage margin or operating in higher voltage environments.

Packaging Considerations:

All recommended substitutes maintain RoHS3 compliance and surface mount technology. The STPS140UY and most substitutes use DO-214AA (SMB) package. The SK14 uses DO-214AC (SMA) package, which is mechanically similar but requires verification of PCB footprint compatibility. The CDBB240-G from Comchip Technology operates at a reduced maximum junction temperature (125°C versus 150°C) and should be evaluated for thermal margin in high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the B140B-13-F replace the STPS140UY directly?

A: Yes. The B140B-13-F is a direct functional equivalent with identical 40 V reverse voltage and 1 A current ratings in the same DO-214AA SMB package. Both are RoHS3 compliant. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and reverse leakage current specification (500 µA versus 12 µA).

Q: What is the difference between the SK14 and STPS140UY?

A: The SK14 maintains identical electrical ratings (40 V, 1 A) but uses the DO-214AC (SMA) package instead of DO-214AA (SMB). The packages are mechanically similar but have different footprints. The SK14 offers lower forward voltage (500 mV @ 1 A versus 650 mV @ 2 A) and extended temperature range (-55 to 150°C). PCB layout verification is required before substitution.

Q: Can I use a higher current rated part like the B240-13-F as a substitute?

A: Yes. The B240-13-F (40 V, 2 A) is electrically compatible with the STPS140UY. Higher current rating provides additional design margin and does not degrade circuit performance. The part maintains the same 40 V reverse voltage and DO-214AA SMB package. Forward voltage characteristics differ slightly (500 mV @ 2 A versus 650 mV @ 2 A).

Q: What is the advantage of using a 50 V rated part like the B150B-13-F?

A: The B150B-13-F provides 25% additional reverse voltage margin (50 V versus 40 V) while maintaining 1 A current rating. This is beneficial in applications with voltage transients or where design specifications allow for higher voltage rating. The part maintains DO-214AA SMB package compatibility and RoHS3 compliance.

Q: Are all substitute parts automotive qualified?

A: Most substitutes carry automotive grade designation or AEC-Q101 qualification. The STPS140UY, B140HB-13-F, B340B-13-F, and SK14 explicitly list automotive grade or AEC-Q101 qualification. The B140B-13-F, B150B-13-F, B240-13-F, B250-13-F, B340LB-13-F, B350B-13-F, and CDBB240-G do not explicitly list automotive qualification in the provided specifications but are RoHS3 compliant and suitable for general industrial applications.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: Both are surface mount Schottky diode packages with similar electrical performance. DO-214AA (SMB) is larger than DO-214AC (SMA). The STPS140UY uses DO-214AA. The SK14 uses DO-214AC. PCB footprints differ, requiring layout verification before substitution. Both packages are mechanically compatible with standard reflow soldering processes.

Q: Which substitute offers the lowest forward voltage drop?

A: The B340LB-13-F offers the lowest forward voltage drop at 450 mV @ 3 A. However, this part is rated for 3 A current, which exceeds the STPS140UY specification. For direct 1 A equivalent substitutes, the SK14 and B140B-13-F offer 500 mV @ 1 A, compared to the STPS140UY at 650 mV @ 2 A.

Q: Can I substitute the STPS140UY with a part rated for lower voltage?

A: No. Substitute parts must have reverse voltage rating equal to or greater than 40 V. Using a lower voltage rated part creates risk of diode failure under normal operating conditions.

Q: What is the moisture sensitivity level (MSL) for these parts?

A: All listed parts, including the STPS140UY and all substitutes, have MSL rating of 1 (Unlimited). This indicates no moisture sensitivity restrictions and standard handling procedures apply.

Q: Are there any temperature range limitations I should consider?

A: The STPS140UY operates from -40 to 150°C junction temperature. Most substitutes extend the lower temperature limit to -55 or -65°C. The CDBB240-G and B340LB-13-F reduce the upper limit to 125°C. Verify that substitute parts meet the application's thermal requirements before selection.

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