SK1545-TP Equivalent & Substitute Parts

Part Overview

The SK1545-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 45V DC reverse voltage and 15A average rectified current in a DO-214AB surface mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a junction temperature range of -55°C to 125°C and complies with RoHS3 and REACH regulations.

Key Parameters

Parameter	Value
Manufacturer Part Number	SK1545-TP
Manufacturer	Micro Commercial Co
Category	Diodes, Rectifiers
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	15 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SK1545-TP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage rating: 45V DC reverse voltage (Vr) minimum
Current rating: 15A average rectified current (Io) minimum
Package type: DO-214AB surface mount (SMC)
Technology: Schottky rectifier diode
Speed classification: Fast recovery ≤ 500ns

Substitution Logic:

The SK1545-TP specified 15A current capacity at 45V. Direct equivalents must maintain or exceed both voltage and current ratings. Parts with lower current ratings (3A, 5A, 8A) are classified as partial substitutes suitable only for applications requiring reduced current capacity. The STPS340SY operates at 40V, which is below the 45V specification and therefore represents a downgrade in voltage capability. The TLHF4900 is an LED component and is not a functional substitute for this rectifier diode application.

Active product alternatives from Microchip Technology (LSM345J/TR13, LSM545J/TR13, LSM845J/TR13, HSM845J/TR13) and STMicroelectronics (STPS340SY) provide viable substitution paths with varying current ratings and compliance profiles.

Parameter Comparison

Parameter	SK1545-TP	LSM345J/TR13	LSM545J/TR13	LSM845J/TR13	HSM845J/TR13	STPS340SY
Manufacturer	Micro Commercial Co	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	40 V
Current - Average Rectified (Io)	15 A	3 A	5 A	8 A	8 A	3 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A	520 mV @ 3 A	520 mV @ 5 A	520 mV @ 8 A	620 mV @ 8 A	630 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	DO-214AB, SMC	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	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-40°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Full Current Capacity):

No active product maintains the exact 15A current specification of the SK1545-TP. The obsolete status of the original part requires evaluation of application-specific current requirements.

Partial Substitutes (Reduced Current Capacity):

LSM845J/TR13 and HSM845J/TR13 provide 8A current capacity at 45V, representing the highest current rating among active alternatives. Both maintain the DO-214AB package and fast recovery speed characteristics. LSM845J/TR13 is preferred for new designs due to active product status and RoHS non-compliance consistency with other Microchip alternatives. HSM845J/TR13 extends operating temperature to 175°C, providing thermal margin advantage.

LSM545J/TR13 offers 5A capacity and LSM345J/TR13 provides 3A capacity, both suitable for applications with proportionally reduced current requirements.

Voltage-Reduced Alternative:

STPS340SY operates at 40V maximum reverse voltage, below the 45V specification. This part is suitable only for applications where 40V voltage margin is acceptable. STPS340SY provides RoHS3 compliance and AEC-Q101 automotive qualification. Operating temperature range is -40°C to 150°C.

Compliance Considerations:

The original SK1545-TP is RoHS3 compliant. Microchip alternatives (LSM345J/TR13, LSM545J/TR13, LSM845J/TR13, HSM845J/TR13) are RoHS non-compliant. STPS340SY maintains RoHS3 compliance. Design requirements for regulatory compliance must be evaluated against substitution selection.

Frequently Asked Questions (FAQ)

Q: Can LSM845J/TR13 directly replace SK1545-TP in all applications?

A: LSM845J/TR13 is a partial substitute. It maintains 45V voltage rating and fast recovery speed in the same DO-214AB package. However, it provides 8A current capacity versus the original 15A specification. Substitution is valid only for applications where 8A current capacity is sufficient. Circuit analysis must confirm that maximum current demand does not exceed 8A.

Q: What is the difference between LSM845J/TR13 and HSM845J/TR13?

A: Both parts provide 45V, 8A Schottky rectifier diodes in DO-214AB packages with fast recovery characteristics. HSM845J/TR13 extends the operating temperature range to 175°C compared to 150°C for LSM845J/TR13. Forward voltage at 8A is 620 mV for HSM845J/TR13 versus 520 mV for LSM845J/TR13. Reverse leakage current is 250 µA for HSM845J/TR13 versus 2 mA for LSM845J/TR13.

Q: Why is STPS340SY listed as a substitute if it has only 40V rating?

A: STPS340SY is included as a partial substitute for applications where 40V reverse voltage margin is acceptable. It provides RoHS3 compliance and AEC-Q101 automotive qualification. The 40V rating represents a voltage downgrade from the 45V specification and must be evaluated against circuit requirements.

Q: Is the TLHF4900 a suitable substitute?

A: No. TLHF4900 is an LED component (orange indicator light) and is not functionally equivalent to the SK1545-TP Schottky rectifier diode. This part appears in the original substitute list but does not meet rectifier diode application requirements.

Q: What are the packaging differences among substitute parts?

A: All substitute parts use the DO-214AB surface mount package (SMC). Packaging variations exist in tape format: LSM345J/TR13 uses Cut Tape (CT) & Digi-Reel®, while LSM545J/TR13, LSM845J/TR13, and HSM845J/TR13 use Tape & Reel (TR). STPS340SY uses Cut Tape (CT) & Digi-Reel®. These packaging differences affect procurement and handling but do not impact electrical performance or PCB assembly compatibility.

Q: How does forward voltage affect substitution?

A: Forward voltage (Vf) varies among substitutes. SK1545-TP specifies 550 mV @ 15A. LSM345J/TR13, LSM545J/TR13, and LSM845J/TR13 specify 520 mV at their respective current ratings. HSM845J/TR13 specifies 620 mV @ 8A. STPS340SY specifies 630 mV @ 3A. Lower forward voltage reduces power dissipation and heat generation. Circuit thermal analysis should account for these differences when selecting substitutes.

Q: What is the impact of RoHS compliance on substitution?

A: SK1545-TP is RoHS3 compliant. Microchip alternatives (LSM345J/TR13, LSM545J/TR13, LSM845J/TR13, HSM845J/TR13) are RoHS non-compliant. STPS340SY is RoHS3 compliant. Design requirements for regulatory compliance in target markets must be evaluated. RoHS non-compliance may restrict use in certain applications or regions.

Q: Can I use a lower current-rated part in a 15A application?

A: No. Using a part with lower current rating than the application requirement will result in component failure, excessive heat generation, and potential circuit damage. Current rating must equal or exceed the maximum circuit current demand. If only lower-rated substitutes are available, circuit redesign to reduce current requirements is necessary.

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