SK845L-TP Equivalent & Substitute Parts

Part Overview

The SK845L-TP is a Schottky rectifier diode rated for 45 V DC reverse voltage and 8 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for legacy system maintenance, repair operations, and design transitions to active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 8 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK845L-TP requires evaluation against the following critical parameters:

Voltage Rating: The main part operates at 45 V DC reverse. Substitute parts must maintain equal or higher reverse voltage rating to ensure safe operation in the original circuit.

Current Rating: The main part is rated for 8 A average rectified current. Substitute parts with lower current ratings (3 A) represent downrated alternatives suitable only for circuits where the actual operating current does not exceed the substitute's rating.

Forward Voltage Drop: The main part exhibits 650 mV forward voltage at 8 A. Substitute parts with different forward voltage characteristics will alter circuit performance, particularly in power dissipation and efficiency calculations.

Package Compatibility: All substitute parts maintain the DO-214AB SMC surface mount package, ensuring mechanical and thermal interface compatibility.

Technology & Speed: All parts are Schottky diodes with fast recovery characteristics (≤ 500ns), maintaining switching performance requirements.

Compliance & Status: Substitute parts from STMicroelectronics (STPS series) are classified as Active products, providing long-term availability and support compared to the Not For New Designs status of the SK845L-TP.

Parameter Comparison

Parameter	SK845L-TP	STPS340S	STPS340SY	STPS3L40S	STPS3L40SY
Manufacturer	Micro Commercial Co	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	45 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	8 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 8 A	630 mV @ 3 A	630 mV @ 3 A	500 mV @ 3 A	500 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	1 mA @ 45 V	20 µA @ 40 V	20 µA @ 40 V	100 µA @ 40 V	100 µA @ 40 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150°C	150°C (Max)	-40 to 150°C	150°C (Max)	-40 to 150°C
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	—	—	Automotive	—	Automotive

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance):

No direct equivalent exists among the listed substitute parts. The SK845L-TP operates at 45 V with 8 A capacity, while all STMicroelectronics substitutes are rated for 40 V maximum reverse voltage and 3 A maximum current. Direct substitution is not electrically equivalent.

For Downrated Applications (Lower Current Requirements):

When circuit operating current does not exceed 3 A and reverse voltage does not exceed 40 V, the STPS340S, STPS340SY, STPS3L40S, and STPS3L40SY are suitable alternatives. Selection among these four options depends on application-specific requirements:

STPS340S and STPS340SY are electrically identical (630 mV forward voltage @ 3 A) with differences in temperature range and automotive qualification. STPS340SY includes automotive-grade certification (AEC-Q101) and extended temperature range (-40 to 150°C), making it suitable for automotive and industrial applications requiring temperature stability.

STPS3L40S and STPS3L40SY offer lower forward voltage (500 mV @ 3 A), reducing power dissipation compared to STPS340 variants. STPS3L40SY includes automotive-grade certification and extended temperature range.

For New Designs:

All substitute parts carry Active product status, ensuring long-term availability and manufacturer support. STPS3L40SY is recommended for new designs requiring automotive qualification, extended temperature range, and optimized power efficiency.

Compliance Considerations:

All parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can the SK845L-TP be directly replaced with STPS340S?

A: No. The SK845L-TP is rated for 45 V and 8 A, while STPS340S is rated for 40 V and 3 A. Direct substitution is not electrically equivalent. STPS340S is suitable only for applications where operating current does not exceed 3 A and reverse voltage does not exceed 40 V.

Q: What is the difference between STPS340S and STPS340SY?

A: Both parts have identical electrical specifications (40 V, 3 A, 630 mV forward voltage). STPS340SY includes automotive-grade certification (AEC-Q101) and extended operating temperature range (-40 to 150°C), compared to STPS340S which specifies 150°C maximum. STPS340SY is suitable for automotive and temperature-critical applications.

Q: Why do STPS3L40S and STPS3L40SY have lower forward voltage than STPS340 variants?

A: Forward voltage is a characteristic of the diode's internal structure and material composition. STPS3L40 series exhibits 500 mV forward voltage at 3 A, compared to 630 mV for STPS340 series. Lower forward voltage reduces power dissipation and heat generation in the application circuit.

Q: Are all substitute parts in the same package as SK845L-TP?

A: Yes. All substitute parts use the DO-214AB SMC surface mount package, ensuring mechanical and thermal compatibility with existing PCB layouts and assembly processes.

Q: Which substitute part is recommended for automotive applications?

A: STPS340SY and STPS3L40SY both carry automotive-grade designation with AEC-Q101 qualification. STPS3L40SY is preferred for automotive applications requiring optimized power efficiency due to its lower forward voltage (500 mV vs. 630 mV).

Q: What is the impact of lower current rating on circuit design?

A: Substitute parts rated for 3 A maximum current can only be used in circuits where the actual operating current does not exceed 3 A. Exceeding this rating causes excessive heat generation, reduced component life, and potential circuit failure. Circuit analysis must confirm that peak and average currents remain below the substitute part's rating.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (STPS340S, STPS340SY, STPS3L40S, STPS3L40SY) are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements.

Q: What is the significance of the "Not For New Designs" status of SK845L-TP?

A: This status indicates the part has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available for legacy system support, but long-term availability is not guaranteed. Active substitute parts from STMicroelectronics provide assured long-term supply for new designs and system upgrades.

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