STPS3L40SY Equivalent & Substitute Parts

Part Overview

The STPS3L40SY is a 40 V, 3 A Schottky rectifier diode manufactured by STMicroelectronics in the DO-214AB (SMC) surface mount package. This component is classified as Active product status and is designed for fast recovery applications with switching speeds of 500 ns or less at currents exceeding 200 mA. The STPS3L40SY is ROHS3 compliant and automotive-grade, making it suitable for demanding applications requiring reliable rectification and reverse voltage protection. Equivalent and substitute parts are identified based on matching or exceeding the electrical specifications and mechanical compatibility of the original component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 40 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-40°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the STPS3L40SY are classified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating of 40 V or higher
Current - Average Rectified (Io) rating of 3 A or higher
Fast Recovery Schottky technology with switching speed ≤ 500 ns at > 200 mA
Surface mount package in DO-214AB (SMC) form factor
Forward voltage (Vf) characteristics compatible with 40 V, 3 A operation
Operating temperature range supporting -40°C to 150°C or equivalent

Grouping Logic:

Group 1: Direct Equivalents (40 V, 3 A) Parts matching the exact voltage and current ratings with identical forward voltage characteristics and package specifications.

Group 2: Higher Current Capability (40 V, 5 A) Parts with 40 V reverse voltage rating but increased current capacity to 5 A. These provide superior current handling while maintaining voltage compatibility.

Group 3: Higher Voltage Rating (50 V, 3 A) Parts with increased reverse voltage rating to 50 V while maintaining 3 A current capacity. These provide enhanced voltage margin in the same current class.

Group 4: Higher Voltage and Current (50 V, 5 A) Parts with both increased voltage and current ratings, providing maximum performance headroom.

Group 5: Marginal Compatibility (45 V, 3 A) Parts with intermediate voltage ratings between 40 V and 50 V. These require application-level verification due to higher reverse leakage characteristics.

All substitute parts maintain Schottky technology, fast recovery characteristics, ROHS3 compliance, and surface mount DO-214AB packaging.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	RoHS Status
STPS3L40SY	STMicroelectronics	40	3	500 @ 3 A	100 @ 40 V	150	DO-214AB, SMC	ROHS3 Compliant
30BQ040	SMC Diode Solutions	40	—	680 @ 3 A	500 @ 40 V	150	DO-214AB, SMC	ROHS3 Compliant
B340-13-F	Diodes Incorporated	40	3	500 @ 3 A	500 @ 40 V	125	DO-214AB, SMC	ROHS3 Compliant
B340CE-13	Diodes Incorporated	40	3	500 @ 3 A	200 @ 40 V	150	DO-214AB, SMC	ROHS3 Compliant
B340Q-13-F	Diodes Incorporated	40	3	500 @ 3 A	500 @ 40 V	150	DO-214AB, SMC	ROHS3 Compliant
B350-13-F	Diodes Incorporated	50	3	700 @ 3 A	500 @ 50 V	125	DO-214AB, SMC	ROHS3 Compliant
B540C-13-F	Diodes Incorporated	40	5	550 @ 5 A	500 @ 40 V	150	DO-214AB, SMC	ROHS3 Compliant
B550C-13-F	Diodes Incorporated	50	5	700 @ 5 A	500 @ 50 V	150	DO-214AB, SMC	ROHS3 Compliant
CDBC340-G	Comchip Technology	40	3	500 @ 3 A	500 @ 40 V	125	DO-214AB, SMC	ROHS3 Compliant
CDBC540-G	Comchip Technology	40	5	550 @ 5 A	500 @ 40 V	125	DO-214AB, SMC	ROHS3 Compliant
LSM345J/TR13	Microchip Technology	45	3	520 @ 3 A	1500 @ 45 V	150	DO-214AB, SMC	RoHS non-compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for Pin-Compatible Replacement)

The following parts provide electrical and thermal characteristics matching or exceeding the STPS3L40SY specification:

B340CE-13 (Diodes Incorporated): Matches 40 V, 3 A ratings with identical forward voltage (500 mV @ 3 A). Operating temperature range extends to 150°C, matching the original. Reverse leakage of 200 µA @ 40 V is lower than competing alternatives. ROHS3 compliant. Tape & Reel packaging.
B340Q-13-F (Diodes Incorporated): Matches 40 V, 3 A ratings with identical forward voltage (500 mV @ 3 A). Includes AEC-Q101 automotive qualification and Automotive grade designation. Operating temperature range extends to 150°C. ROHS3 compliant. Tape & Reel packaging. Suitable for automotive applications requiring formal qualification.
CDBC340-G (Comchip Technology): Matches 40 V, 3 A ratings with identical forward voltage (500 mV @ 3 A). ROHS3 compliant. Maximum junction temperature of 125°C is lower than the original, requiring thermal margin verification in high-temperature applications. Tape & Reel packaging.

Higher Current Capability (40 V, 5 A)

B540C-13-F (Diodes Incorporated): Provides 40 V reverse voltage with increased current capacity to 5 A. Forward voltage of 550 mV @ 5 A is slightly elevated compared to the original 500 mV @ 3 A. Operating temperature range extends to 150°C. ROHS3 compliant. Cut Tape & Digi-Reel packaging. Suitable for applications requiring higher current handling within the same voltage class.
CDBC540-G (Comchip Technology): Provides 40 V reverse voltage with increased current capacity to 5 A. Forward voltage of 550 mV @ 5 A. Maximum junction temperature of 125°C requires thermal verification. ROHS3 compliant. Cut Tape & Digi-Reel packaging.

Higher Voltage Rating (50 V, 3 A)

B350-13-F (Diodes Incorporated): Provides increased reverse voltage rating to 50 V while maintaining 3 A current capacity. Forward voltage increases to 700 mV @ 3 A. Maximum junction temperature of 125°C is lower than the original. ROHS3 compliant. Tape & Reel packaging. Suitable for applications requiring enhanced voltage margin.

Higher Voltage and Current (50 V, 5 A)

B550C-13-F (Diodes Incorporated): Provides 50 V reverse voltage with 5 A current capacity. Forward voltage of 700 mV @ 5 A. Operating temperature range extends to 150°C. ROHS3 compliant. Cut Tape & Digi-Reel packaging. Suitable for applications requiring maximum performance headroom in both voltage and current.

Marginal Compatibility (45 V, 3 A)

LSM345J/TR13 (Microchip Technology): Provides intermediate 45 V reverse voltage with 3 A current capacity. Forward voltage of 520 mV @ 3 A is comparable to the original. Reverse leakage of 1.5 mA @ 45 V is significantly higher than all other alternatives, indicating higher standby current consumption. RoHS non-compliant status excludes this part from applications requiring ROHS3 certification. Not recommended for new designs.

Partial Specification Match

30BQ040 (SMC Diode Solutions): Provides 40 V reverse voltage with unspecified average rectified current. Forward voltage of 680 mV @ 3 A is elevated compared to the original 500 mV. Reverse leakage of 500 µA @ 40 V is higher than the original 100 µA. REACH Affected status requires supply chain verification. Not recommended as primary substitute.

Frequently Asked Questions (FAQ)

Q: Can I use B340CE-13 as a direct replacement for STPS3L40SY?

A: Yes. B340CE-13 matches the 40 V reverse voltage and 3 A current ratings with identical forward voltage characteristics (500 mV @ 3 A). Both components use the DO-214AB (SMC) surface mount package and are ROHS3 compliant. Operating temperature range extends to 150°C on both parts. Pin-to-pin compatibility is maintained.

Q: What is the difference between B340-13-F and B340CE-13?

A: Both parts share the same 40 V, 3 A electrical ratings and 500 mV forward voltage. The primary differences are: B340-13-F has a maximum junction temperature of 125°C versus 150°C for B340CE-13, and B340CE-13 has lower reverse leakage (200 µA @ 40 V versus 500 µA @ 40 V). For applications operating near maximum temperature, B340CE-13 is preferred.

Q: Should I use B350-13-F if my circuit operates at 40 V?

A: B350-13-F is rated for 50 V reverse voltage, which exceeds the 40 V requirement. This provides additional voltage margin and is electrically compatible. However, forward voltage increases to 700 mV @ 3 A compared to 500 mV on the original. Maximum junction temperature is 125°C, which is lower than the original 150°C. Use B350-13-F only if the higher forward voltage drop and lower temperature rating are acceptable for your application.

Q: Can I use a 5 A rated diode (B540C-13-F) in place of the 3 A STPS3L40SY?

A: Yes. B540C-13-F is rated for 40 V reverse voltage and 5 A average rectified current, which exceeds the 3 A requirement. This provides additional current capacity margin. Forward voltage is 550 mV @ 5 A, slightly higher than the original 500 mV @ 3 A. Operating temperature range extends to 150°C. The part is electrically compatible and pin-compatible in the DO-214AB package.

Q: What does ROHS3 compliance mean for component substitution?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitute parts are ROHS3 compliant, ensuring compatibility with regulatory requirements for consumer and industrial applications. LSM345J/TR13 is RoHS non-compliant and should not be used in applications requiring ROHS3 certification.

Q: Why is reverse leakage current important when selecting a substitute?

A: Reverse leakage current (Ir) determines standby power consumption and heat generation when the diode is reverse-biased. The original STPS3L40SY has 100 µA @ 40 V leakage. Most substitutes have 500 µA @ 40 V, representing a 5× increase in standby current. LSM345J/TR13 has 1.5 mA @ 45 V, representing a 15× increase. For battery-powered or low-power applications, lower reverse leakage is preferred.

Q: Are all substitute parts available in the same packaging options?

A: No. The original STPS3L40SY is supplied in Cut Tape (CT) & Digi-Reel packaging. Some substitutes are available only in Tape & Reel (TR) format. B340CE-13, B340Q-13-F, B350-13-F, and LSM345J/TR13 are supplied in Tape & Reel. B340-13-F, B540C-13-F, B550C-13-F, CDBC540-G, and 30BQ040 are available in Cut Tape & Digi-Reel. Verify packaging availability with your supplier before design finalization.

Q: What is the significance of AEC-Q101 qualification on B340Q-13-F?

A: AEC-Q101 is an automotive electronics qualification standard. B340Q-13-F carries both AEC-Q101 qualification and Automotive grade designation, indicating it has undergone rigorous testing for automotive applications. The original STPS3L40SY also carries Automotive grade. For non-automotive applications, AEC-Q101 qualification is not required but indicates higher reliability standards.

Q: Can I substitute LSM345J/TR13 for STPS3L40SY?

A: LSM345J/TR13 is not recommended. While it provides 45 V reverse voltage and 3 A current capacity, it has three significant limitations: (1) RoHS non-compliant status excludes it from applications requiring ROHS3 certification, (2) reverse leakage of 1.5 mA @ 45 V is 15 times higher than the original, causing excessive standby current consumption, and (3) forward voltage of 520 mV @ 3 A is slightly elevated. Use only if regulatory compliance is not required and higher standby current is acceptable.

Q: How do I determine if a substitute part will work in my application?

A: Verify the following parameters match or exceed your circuit requirements: (1) Reverse voltage (Vr) rating must equal or exceed your maximum reverse bias voltage, (2) Average rectified current (Io) must equal or exceed your maximum forward current, (3) Forward voltage (Vf) must be compatible with your circuit design, (4) Operating temperature range must encompass your application environment, (5) Package and pinout must match your PCB layout, and (6) Compliance certifications (ROHS3, REACH) must meet your regulatory requirements.

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