SK55L-TP Equivalent & Substitute Parts

Part Overview

The SK55L-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 5A 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. Identifying equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this diode was previously specified.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	5 A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 50 V
Package / Case	DO-214AB, SMC
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SK55L-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50V
Current - Average Rectified (Io): Must equal or exceed 5A
Package / Case: Must be DO-214AB, SMC (surface mount)
Technology: Schottky rectifier diode
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature Range: Must support -55°C to 150°C junction temperature
RoHS3 Compliance: Required for regulatory alignment
Mounting Type: Surface Mount

Substitute parts are categorized into two groups:

Group 1 - Full Parametric Equivalents (50V, 5A): Parts meeting or exceeding all primary specifications with identical voltage and current ratings. These provide direct functional replacement.

Group 2 - Reduced Current Equivalents (40V, 3A): Parts with lower voltage or current ratings. These are suitable only for applications where the circuit operates below the reduced specifications and where thermal and electrical margins permit downrating.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	Operating Temp (Junction)
SK55L-TP	Micro Commercial Co	50 V	5 A	750 mV @ 5 A	1 mA @ 50 V	DO-214AB, SMC	Not For New Designs	-55°C ~ 150°C
B550C-13-F	Diodes Incorporated	50 V	5 A	700 mV @ 5 A	500 µA @ 50 V	DO-214AB, SMC	Active	-55°C ~ 150°C
SK55C	Taiwan Semiconductor Corporation	50 V	5 A	750 mV @ 5 A	500 µA @ 50 V	DO-214AB, SMC	Active	-55°C ~ 150°C
SK55_R1_00001	Panjit International Inc.	50 V	5 A	750 mV @ 5 A	100 µA @ 50 V	DO-214AB, SMC	Active	-55°C ~ 150°C
CDBC540-HF	Comchip Technology	40 V	5 A	550 mV @ 5 A	500 µA @ 40 V	DO-214AB, SMC	Active	-50°C ~ 150°C
MBRS540T3G	onsemi	40 V	5 A	500 mV @ 5 A	300 µA @ 40 V	DO-214AB, SMC	Active	-65°C ~ 150°C
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	20 µA @ 40 V	DO-214AB, SMC	Active	-55°C ~ 150°C
STPS340SY	STMicroelectronics	40 V	3 A	630 mV @ 3 A	20 µA @ 40 V	DO-214AB, SMC	Active	-40°C ~ 150°C
STPS3L40S	STMicroelectronics	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	DO-214AB, SMC	Active	-55°C ~ 150°C
STPS3L40SY	STMicroelectronics	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	DO-214AB, SMC	Active	-40°C ~ 150°C

Engineering Selection Recommendations

Full Parametric Equivalents (Recommended for Direct Replacement):

The following parts provide complete functional equivalence to the SK55L-TP with 50V, 5A ratings and Active product status:

B550C-13-F (Diodes Incorporated): Meets all primary specifications with improved forward voltage (700 mV vs 750 mV). Active product status with ROHS3 compliance. Available in Cut Tape and Digi-Reel packaging options.
SK55C (Taiwan Semiconductor Corporation): Parametric equivalent with identical forward voltage (750 mV @ 5A). Active product status. Suitable for direct substitution in existing designs.
SK55_R1_00001 (Panjit International Inc.): Parametric equivalent with identical forward voltage (750 mV @ 5A) and superior reverse leakage characteristics (100 µA vs 1 mA). Active product status. Available in Tape & Reel packaging.

Reduced Rating Alternatives (Application-Dependent):

The following parts operate at reduced voltage (40V) or current (3A or 5A) ratings and are suitable only where circuit design margins permit downrating:

CDBC540-HF (Comchip Technology): 40V, 5A rating with improved forward voltage (550 mV @ 5A). Active product status. Suitable for applications operating below 40V.
MBRS540T3G (onsemi): 40V, 5A rating with superior forward voltage (500 mV @ 5A) and extended temperature range (-65°C to 150°C). Active product status.
STPS340S, STPS340SY (STMicroelectronics): 40V, 3A ratings. STPS340SY includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 150°C). Suitable for lower current applications.
STPS3L40S, STPS3L40SY (STMicroelectronics): 40V, 3A ratings with improved forward voltage (500 mV @ 3A). STPS3L40SY includes automotive qualification. Suitable for lower current applications.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and surface mount DO-214AB packaging compatibility with the original SK55L-TP.

Frequently Asked Questions (FAQ)

Q: Can B550C-13-F directly replace SK55L-TP in all applications?

A: B550C-13-F meets all primary electrical specifications (50V, 5A, DO-214AB package) and is classified as Active product status. It provides direct functional replacement. The forward voltage is slightly lower (700 mV vs 750 mV), which is favorable for thermal performance. Verify packaging format compatibility (Cut Tape vs Digi-Reel) with your assembly process.

Q: What is the difference between SK55C and SK55_R1_00001?

A: Both are 50V, 5A parametric equivalents with identical forward voltage (750 mV @ 5A). SK55_R1_00001 offers superior reverse leakage characteristics (100 µA vs 500 µA @ 50V). SK55_R1_00001 is supplied in Tape & Reel packaging, while SK55C packaging format is not specified in available data.

Q: Can I use MBRS540T3G (40V, 5A) instead of SK55L-TP (50V, 5A)?

A: MBRS540T3G is rated for 40V maximum reverse voltage, which is 10V lower than the SK55L-TP specification. This part is suitable only for applications where the circuit operates below 40V and where design margins accommodate the reduced voltage rating. Forward voltage performance is superior (500 mV @ 5A). Verify circuit voltage requirements before substitution.

Q: Why are STPS340S and STPS340SY rated for only 3A when SK55L-TP is 5A?

A: STPS340S and STPS340SY are designed for lower current applications (3A vs 5A). These parts are suitable only for circuits requiring 3A or less. They cannot be used as direct replacements in 5A applications. STPS340SY includes automotive qualification (AEC-Q101) and is suitable for automotive applications within the 3A current limit.

Q: What is the significance of the "SY" suffix in STMicroelectronics part numbers?

A: The "SY" suffix indicates automotive-grade qualification (AEC-Q101). STPS340SY and STPS3L40SY are qualified for automotive applications. These parts are suitable for automotive designs requiring automotive-grade components. Non-automotive applications may use the standard "S" suffix versions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, consistent with the SK55L-TP specification. All parts also maintain MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Cut Tape (CT) and Digi-Reel packaging formats. B550C-13-F is available in both Cut Tape and Digi-Reel. SK55_R1_00001 is supplied in Tape & Reel (TR) format. Verify packaging compatibility with your assembly equipment and procurement requirements.

Q: Can I use a 40V part in a 50V circuit?

A: No. Parts rated for 40V maximum reverse voltage cannot be used in circuits where 50V reverse voltage is possible. Using an undersized voltage rating creates risk of diode failure and circuit malfunction. Use only parts rated for the actual circuit voltage or higher.

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