2SD1815-T-TP Equivalent & Substitute Parts

Part Overview

The 2SD1815-T-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 100 V collector-emitter breakdown voltage and 3 A maximum collector current. This surface mount device in DPAK packaging is designed for general-purpose switching and amplification applications requiring 1 W power dissipation at 180 MHz transition frequency. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	3	A
Power - Max	1	W
Frequency - Transition	180	MHz
Operating Temperature Range	-55°C to 150°C	TJ
Package / Case	TO-252-3, DPAK	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2SD1815-T-TP is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown (Max) must be 100 V or greater
Current - Collector (Ic) (Max) must be 3 A or greater
Operating temperature range must encompass -55°C to 150°C or be compatible with application requirements
Package / Case must be TO-252-3, DPAK (2 Leads + Tab), SC-63 for direct mechanical compatibility

Substitution Categories:

Direct Manufacturer Equivalent: Parts with identical electrical ratings and package specifications from alternative manufacturers, maintaining full pin and functional compatibility.

Similar Manufacturer Parts: Parts with the same voltage and current ratings in identical packaging but potentially different secondary characteristics (transition frequency, power dissipation, DC current gain). These parts are suitable for applications where the primary electrical specifications (voltage, current, package) are the determining factors.

Substitutes are grouped based on product status (active vs. obsolete) and availability to support component selection for new designs or legacy system maintenance.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency - Transition	Operating Temp Range	Package	Product Status	Inventory
2SD1815-T-TP	Micro Commercial Co	3 A	100 V	1 W	180 MHz	-55°C to 150°C	TO-252-3, DPAK	Obsolete	963 Pcs
2SD1815T-TL-E	onsemi	3 A	100 V	1 W	180 MHz	-55°C to 150°C	TO-252-3, DPAK	Obsolete	5530 Pcs
MJD31CG	onsemi	3 A	100 V	1.56 W	3 MHz	-65°C to 150°C	TO-252-3, DPAK	Active	29245 Pcs
MJD31CQ-13	Diodes Incorporated	3 A	100 V	15 W	3 MHz	-55°C to 150°C	TO-252-3, DPAK	Not For New Designs	5400 Pcs
MJD31CRLG	onsemi	3 A	100 V	1.56 W	3 MHz	-65°C to 150°C	TO-252-3, DPAK	Active	1556 Pcs
MJD31CT4G	onsemi	3 A	100 V	1.56 W	3 MHz	-65°C to 150°C	TO-252-3, DPAK	Active	35200 Pcs
MJD31CUQ-13	Diodes Incorporated	3 A	100 V	1.6 W	3 MHz	-55°C to 150°C	TO-252-3, DPAK	Active	3467 Pcs

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Obsolete): The 2SD1815T-TL-E from onsemi provides direct electrical and mechanical compatibility with the 2SD1815-T-TP. Both parts share identical voltage, current, power, and frequency specifications with matching operating temperature ranges and DPAK packaging. This part is suitable for legacy system maintenance where the original specification must be preserved. Inventory availability is higher (5530 Pcs vs. 963 Pcs).

For New Designs and Active Component Selection: The MJD31CT4G, MJD31CRLG, and MJD31CG from onsemi are active product status parts meeting all electrical requirements (100 V, 3 A, DPAK package). These parts provide extended operating temperature range (-65°C to 150°C) compared to the original specification. MJD31CT4G offers the highest inventory availability (35200 Pcs) and is recommended for new production designs requiring long-term supply assurance.

For Automotive Applications: The MJD31CUQ-13 from Diodes Incorporated is AEC-Q101 qualified and carries automotive grade designation. This part is suitable for automotive applications requiring qualified components, with active product status and adequate inventory (3467 Pcs).

For Applications Not Requiring New Designs: The MJD31CQ-13 from Diodes Incorporated meets all electrical specifications but carries "Not For New Designs" status. This part is suitable only for legacy system support and maintenance applications.

All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can the 2SD1815T-TL-E directly replace the 2SD1815-T-TP?

A: Yes. The 2SD1815T-TL-E provides direct replacement compatibility. Both parts share identical electrical specifications (100 V, 3 A, 1 W, 180 MHz) and identical DPAK packaging. The primary difference is manufacturer (onsemi vs. Micro Commercial Co) and higher inventory availability.

Q: What is the difference between the 2SD1815-T-TP and the MJD31 series parts?

A: The MJD31 series parts (MJD31CG, MJD31CT4G, MJD31CRLG, MJD31CQ-13, MJD31CUQ-13) meet the same voltage (100 V) and current (3 A) requirements and use identical DPAK packaging. The primary differences are transition frequency (3 MHz vs. 180 MHz for the original) and power dissipation ratings. MJD31 parts are suitable for applications where the lower frequency specification is acceptable. All MJD31 variants are electrically compatible for switching applications at lower frequencies.

Q: Why do some substitute parts have higher power ratings?

A: Power rating differences reflect design variations between manufacturers. The MJD31CQ-13 (15 W) and MJD31CUQ-13 (1.6 W) have higher power ratings than the original 2SD1815-T-TP (1 W). Higher power ratings indicate greater thermal capability and do not prevent substitution; they simply provide additional margin for thermal management in the application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the environmental compliance of the original 2SD1815-T-TP.

Q: Which substitute part should I select for a new design?

A: For new designs, select from parts with active product status: MJD31CT4G, MJD31CRLG, or MJD31CG from onsemi, or MJD31CUQ-13 from Diodes Incorporated. The MJD31CT4G offers the highest inventory availability (35200 Pcs) and extended operating temperature range (-65°C to 150°C). For automotive applications, the AEC-Q101 qualified MJD31CUQ-13 is recommended.

Q: Can I use MJD31 parts in applications designed for the 2SD1815-T-TP?

A: Yes, provided the application does not depend on the 180 MHz transition frequency specification. The MJD31 series operates at 3 MHz transition frequency, which is suitable for general-purpose switching and lower-frequency amplification. Verify that your application's frequency requirements are compatible with the 3 MHz specification before substitution.

Q: What is the difference between DPAK and TP-FA packaging?

A: Both are surface mount packages in the TO-252-3 family with identical pin configurations and mechanical compatibility. The 2SD1815T-TL-E uses TP-FA designation while other parts use DPAK designation; these are functionally equivalent for PCB assembly and thermal performance.

Q: Are there any temperature range limitations I should consider?

A: The original 2SD1815-T-TP operates from -55°C to 150°C. Most MJD31 variants extend this to -65°C to 150°C, providing wider operating range. The MJD31CQ-13 and MJD31CUQ-13 maintain the -55°C to 150°C range. Verify your application's temperature requirements before selection.

Q: What is the significance of the "Not For New Designs" status on MJD31CQ-13?

A: This designation indicates the part is available for legacy system support and maintenance but should not be selected for new product development. For new designs, choose from active status parts: MJD31CT4G, MJD31CRLG, MJD31CG, or MJD31CUQ-13.

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