STPS140AY Equivalent & Substitute Parts

Part Overview

The STPS140AY 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 SMA (DO-214AC) package. This component is classified as Active product status with automotive-grade qualification. Equivalent and substitute parts are identified based on matching or exceeding electrical performance parameters while maintaining compatibility with the SMA package form factor and surface mount assembly requirements.

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
Current - Reverse Leakage @ Vr	12 µA @ 40 V	µA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-40°C ~ 150°C	°C
Technology	Schottky	-
Grade	Automotive	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts are grouped into three categories based on electrical parameter compatibility with the STPS140AY:

Category 1: Direct Equivalents (40V, 1A) Parts that match the reverse voltage rating (40 V) and average rectified current (1 A) specifications. These parts are functionally interchangeable in applications designed for the STPS140AY electrical specifications. Substitutes in this category include B140-13-F, B140Q-13-F, and CDBA140-G.

Category 2: Higher Voltage Rating (50V, 1A) Parts that exceed the reverse voltage rating to 50 V while maintaining the 1 A current rating. These parts operate within the same current envelope but provide additional voltage margin. Substitutes in this category include B150-13-F and B150Q-13-F. These are suitable for applications where the STPS140AY is specified but higher voltage headroom is acceptable.

Category 3: Higher Current Rating (40V, 2A and 3A) Parts that maintain the 40 V reverse voltage rating but increase the average rectified current capacity to 2 A or 3 A. These parts are suitable for applications requiring higher current handling while operating at the same voltage level. Substitutes in this category include B240A-13-F, B340A-13-F, and B340LA-13-F.

Category 4: Higher Voltage and Current Rating (50V, 2A and 3A) Parts that exceed both the reverse voltage rating (50 V) and average rectified current (2 A or 3 A). Substitutes in this category include B250A-13-F, B350A-13-F. These provide the greatest performance margin but may not be necessary for all applications.

All substitute parts maintain the SMA (DO-214AC) package form factor, surface mount assembly compatibility, fast recovery speed characteristic (≤ 500ns, > 200mA), and Schottky technology classification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Ir @ Vr [µA]	Speed	Package	Temp Range [°C]	Grade	Qualification
STPS140AY	STMicroelectronics	40	1	650 @ 2A	12 @ 40V	≤ 500ns	DO-214AC	-40 to 150	Automotive	-
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	≤ 500ns	DO-214AC	-65 to 150	-	-
B140Q-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	≤ 500ns	DO-214AC	-65 to 150	Automotive	AEC-Q101
B150-13-F	Diodes Incorporated	50	1	700 @ 1A	500 @ 50V	≤ 500ns	DO-214AC	-65 to 150	-	-
B150Q-13-F	Diodes Incorporated	50	1	700 @ 1A	500 @ 40V	≤ 500ns	DO-214AC	-65 to 150	Automotive	AEC-Q101
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	500 @ 40V	≤ 500ns	DO-214AC	-65 to 150	-	-
B250A-13-F	Diodes Incorporated	50	2	700 @ 2A	500 @ 50V	≤ 500ns	DO-214AC	-65 to 150	-	-
B340A-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	≤ 500ns	DO-214AC	-55 to 150	Automotive	AEC-Q101
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3A	2000 @ 40V	≤ 500ns	DO-214AC	-55 to 125	-	-
B350A-13-F	Diodes Incorporated	50	3	700 @ 3A	500 @ 50V	≤ 500ns	DO-214AC	-55 to 150	Automotive	AEC-Q101
CDBA140-G	Comchip Technology	40	1	500 @ 1A	500 @ 40V	≤ 500ns	DO-214AC	-65 to 125	-	-

Engineering Selection Recommendations

For Direct Replacement (Matched Specifications)

B140Q-13-F is the preferred direct substitute for STPS140AY in automotive applications. Both parts carry automotive-grade designation with AEC-Q101 qualification, matching the STPS140AY's automotive classification. Operating temperature range extends to -65°C minimum, exceeding the STPS140AY specification of -40°C. Forward voltage is lower at 500 mV versus 650 mV, providing improved efficiency. Reverse leakage current is higher at 500 µA versus 12 µA, which is acceptable within the 1 A current class.

B140-13-F provides equivalent electrical performance to B140Q-13-F but without automotive-grade designation. This part is suitable for non-automotive applications requiring 40 V, 1 A Schottky rectification.

CDBA140-G from Comchip Technology matches the 40 V, 1 A specifications with equivalent forward voltage and reverse leakage characteristics. Operating temperature range is -65°C to 125°C, which is narrower than STPS140AY at the upper limit. This part is suitable for applications where the upper temperature limit of 125°C is acceptable.

For Higher Voltage Applications

B150Q-13-F is the automotive-qualified substitute when 50 V reverse voltage rating is required while maintaining 1 A current capacity. This part carries AEC-Q101 qualification and automotive-grade designation. Forward voltage increases to 700 mV at 1 A due to the higher voltage rating.

B150-13-F provides the same electrical specifications as B150Q-13-F without automotive qualification, suitable for non-automotive 50 V applications.

For Higher Current Applications

B340A-13-F is the automotive-qualified substitute for applications requiring 3 A current capacity at 40 V. This part carries AEC-Q101 qualification and automotive-grade designation with operating temperature range of -55°C to 150°C.

B240A-13-F provides 2 A current capacity at 40 V without automotive qualification, suitable for non-automotive applications requiring intermediate current handling.

For Combined Higher Voltage and Current

B350A-13-F is the automotive-qualified substitute when both 50 V reverse voltage and 3 A current capacity are required. This part carries AEC-Q101 qualification and automotive-grade designation.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and SMA (DO-214AC) package compatibility with the STPS140AY.

Frequently Asked Questions (FAQ)

Q: Can B140-13-F be used as a direct replacement for STPS140AY?

A: B140-13-F is electrically compatible with STPS140AY for the 40 V, 1 A specifications. However, B140-13-F lacks automotive-grade designation and AEC-Q101 qualification. For automotive applications, B140Q-13-F is the appropriate substitute. For non-automotive applications, B140-13-F is suitable.

Q: What is the difference between B140Q-13-F and B140-13-F?

A: Both parts share identical electrical specifications (40 V, 1 A, 500 mV forward voltage, ≤ 500ns recovery speed). The primary difference is that B140Q-13-F carries automotive-grade designation and AEC-Q101 qualification, while B140-13-F does not. Selection depends on application requirements for automotive compliance.

Q: Can I use B150-13-F (50V) in place of STPS140AY (40V)?

A: Yes. B150-13-F exceeds the voltage rating of STPS140AY, providing additional voltage margin. The 1 A current rating matches. Forward voltage increases to 700 mV due to the higher voltage rating. This substitution is acceptable when higher voltage headroom is beneficial or required by circuit design.

Q: What is the impact of using B340A-13-F (3A) instead of STPS140AY (1A)?

A: B340A-13-F provides higher current capacity (3 A versus 1 A) at the same 40 V voltage rating. The part is physically identical in SMA package form factor and is pin-compatible. This substitution is acceptable and provides additional current margin. Forward voltage remains at 500 mV at the higher current level. Operating temperature range is -55°C to 150°C, which is narrower at the lower limit compared to STPS140AY at -40°C.

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

A: Yes. All substitute parts listed are packaged in DO-214AC (SMA) form factor, maintaining mechanical and electrical compatibility with STPS140AY. Mounting type is surface mount for all parts.

Q: What is the significance of reverse leakage current differences?

A: STPS140AY specifies 12 µA reverse leakage at 40 V, while most substitute parts specify 500 µA at the same voltage. Higher reverse leakage increases standby power dissipation but does not affect forward rectification performance. For applications sensitive to reverse leakage, STPS140AY provides superior performance. For general rectification applications, the higher leakage of substitutes is acceptable.

Q: Can CDBA140-G be used in automotive applications?

A: CDBA140-G does not carry automotive-grade designation or AEC-Q101 qualification. For automotive applications, B140Q-13-F or B340A-13-F (if higher current is needed) are the appropriate choices. CDBA140-G is suitable for non-automotive applications requiring 40 V, 1 A Schottky rectification.

Q: What is the operating temperature consideration when selecting substitutes?

A: STPS140AY operates from -40°C to 150°C. Most Diodes Incorporated substitutes extend the lower limit to -65°C, providing wider temperature range. B340LA-13-F and CDBA140-G have upper temperature limits of 125°C, which is narrower than STPS140AY. Verify application temperature requirements before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance designation, matching the STPS140AY environmental compliance status.

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