SK104-TP Equivalent & Substitute Parts

Part Overview

The SK104-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 10 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The SK104-TP operates across a junction temperature range of -55°C to 125°C and exhibits fast recovery characteristics with forward voltage of 650 mV at 10 A. Its primary application is in rectification circuits requiring high current capacity at moderate voltage ratings.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	10 A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 40 V
Capacitance @ Vr, F	500pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SK104-TP is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 10 A
Package / Case: Must be DO-214AB, SMC (surface mount)
Technology: Schottky rectifier diode
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute Classification:

Direct Equivalent: Parts that match all mandatory criteria with identical or superior electrical performance and active product status.

Functional Equivalent: Parts that meet mandatory criteria but may have variations in secondary parameters such as forward voltage, reverse leakage current, or operating temperature range. These parts are suitable for applications where the SK104-TP specifications are not exceeded.

Partial Equivalent: Parts with lower current ratings (3 A, 5 A, 8 A) that share the same voltage rating and package. These are suitable only for applications requiring lower current than the original 10 A specification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range	Product Status	RoHS Status
SK104-TP	Micro Commercial Co	40 V	10 A	650 mV @ 10 A	1 mA @ 40 V	DO-214AB, SMC	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
SK1045-LTP	Micro Commercial Co	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
5822SMJ/TR13	Microchip Technology	40 V	3 A	500 mV @ 3 A	1.5 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	RoHS non-compliant
B340-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-214AB, SMC	-55°C ~ 125°C	Active	ROHS3 Compliant
B540C-13-F	Diodes Incorporated	40 V	5 A	550 mV @ 5 A	500 µA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
CDBC540-G	Comchip Technology	40 V	5 A	550 mV @ 5 A	500 µA @ 40 V	DO-214AB, SMC	-40°C ~ 125°C	Active	ROHS3 Compliant
HSM840J/TR13	Microchip Technology	40 V	8 A	620 mV @ 8 A	250 µA @ 40 V	DO-214AB, SMC	-55°C ~ 175°C	Active	RoHS non-compliant
LSM340J/TR13	Microchip Technology	40 V	3 A	520 mV @ 3 A	1.5 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	RoHS non-compliant
LSM540J/TR13	Microchip Technology	40 V	5 A	520 mV @ 5 A	2 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	RoHS non-compliant
LSM840J/TR13	Microchip Technology	40 V	8 A	520 mV @ 8 A	2 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	RoHS non-compliant
MBRS340T3G	onsemi	40 V	3 A	500 mV @ 3 A	2 mA @ 40 V	DO-214AB, SMC	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended for 10 A Applications):

SK1045-LTP is the primary direct equivalent. This part maintains the 10 A current rating and DO-214AB package, with active product status and ROHS3 compliance. The voltage rating increases to 45 V, providing additional design margin. Operating temperature range extends to 150°C, and forward voltage decreases to 550 mV at 10 A, indicating improved thermal performance. This part is suitable for direct replacement in all SK104-TP applications.

Functional Equivalents (For Current-Reduced Applications):

Parts rated for 8 A, 5 A, or 3 A current are suitable only for applications where the circuit current requirement does not exceed the substitute part rating. These include:

LSM840J/TR13 and HSM840J/TR13 (8 A rating): Suitable for applications requiring up to 8 A. Both maintain 40 V voltage rating and DO-214AB package. LSM840J/TR13 offers superior forward voltage characteristics (520 mV @ 8 A) compared to HSM840J/TR13 (620 mV @ 8 A).
B540C-13-F, CDBC540-G, and LSM540J/TR13 (5 A rating): Suitable for applications requiring up to 5 A. All maintain 40 V voltage rating and DO-214AB package. B540C-13-F and CDBC540-G offer ROHS3 compliance; LSM540J/TR13 does not.
B340-13-F, 5822SMJ/TR13, LSM340J/TR13, and MBRS340T3G (3 A rating): Suitable for applications requiring up to 3 A. All maintain 40 V voltage rating and DO-214AB package. B340-13-F and MBRS340T3G offer ROHS3 compliance; 5822SMJ/TR13 and LSM340J/TR13 do not.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: SK1045-LTP, B340-13-F, B540C-13-F, CDBC540-G, or MBRS340T3G.

For applications with no RoHS requirement, all listed parts are available.

Frequently Asked Questions (FAQ)

Q: Can SK1045-LTP replace SK104-TP in all applications?

A: SK1045-LTP is a direct equivalent for SK104-TP. Both parts share the same 10 A current rating and DO-214AB package. The 45 V voltage rating of SK1045-LTP exceeds the 40 V requirement of SK104-TP, providing additional design margin. SK1045-LTP is active and ROHS3 compliant, making it suitable for direct replacement.

Q: What is the difference between DO-214AB and SMC package designations?

A: DO-214AB and SMC refer to the same physical package. DO-214AB is the JEDEC designation; SMC is the industry common name. All substitute parts listed use this identical package, ensuring mechanical and thermal compatibility.

Q: Can I use a 5 A rated diode in place of the 10 A SK104-TP?

A: A 5 A rated diode can be used only if the circuit current requirement does not exceed 5 A. If the application requires 10 A operation, a 5 A substitute will exceed its current rating and cause thermal stress and potential failure. Verify circuit current requirements before selecting a lower-rated substitute.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode's reverse recovery time is 500 nanoseconds or less when switching from forward to reverse bias at currents exceeding 200 mA. All listed substitute parts meet this specification, ensuring compatible switching performance in rectification circuits.

Q: Are there differences in forward voltage between substitute parts?

A: Yes. Forward voltage varies among substitutes. SK104-TP specifies 650 mV @ 10 A. SK1045-LTP specifies 550 mV @ 10 A, indicating lower forward voltage drop and reduced power dissipation. For 3 A and 5 A rated parts, forward voltage is measured at their respective current ratings and varies between 500 mV and 620 mV depending on the manufacturer and part number.

Q: What is reverse leakage current and why does it vary among parts?

A: Reverse leakage current is the small current that flows through the diode when reverse biased. SK104-TP specifies 1 mA @ 40 V. Substitute parts range from 200 µA to 2 mA depending on manufacturer and design. Lower reverse leakage indicates better diode quality and lower standby power consumption. All listed values are within acceptable ranges for rectification applications.

Q: Does operating temperature range affect part selection?

A: Operating temperature range affects part selection only if the application requires operation outside the specified range. SK104-TP operates from -55°C to 125°C. SK1045-LTP extends to 150°C, providing additional margin for high-temperature environments. CDBC540-G operates from -40°C to 125°C, which is narrower than SK104-TP and may not be suitable for low-temperature applications below -40°C.

Q: What is the significance of RoHS compliance?

A: ROHS3 compliance indicates the part contains no restricted substances including lead, cadmium, and mercury. For applications subject to environmental regulations or customer requirements, select ROHS3 compliant parts: SK1045-LTP, B340-13-F, B540C-13-F, CDBC540-G, or MBRS340T3G. Parts marked as RoHS non-compliant may contain lead and are restricted in certain markets.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided each part is rated for the current flowing through its location in the circuit. Mixing parts with different forward voltage characteristics may result in unequal current distribution in parallel configurations. For series configurations, mixing parts with different voltage ratings is acceptable as long as the total voltage rating exceeds the circuit requirement.

Q: What is Moisture Sensitivity Level (MSL) and why is it important?

A: MSL indicates the part's sensitivity to moisture absorption during storage and handling. All listed parts have MSL 1 (Unlimited), meaning they can be stored indefinitely without special moisture control measures. This simplifies procurement and inventory management.

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