2SD1815-S-TP Equivalent & Substitute Parts

Part Overview

The 2SD1815-S-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 and 180 MHz transition frequency. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	3	A
Collector-Emitter Breakdown Voltage (Max)	100	V
Power Dissipation (Max)	1	W
Transition Frequency	180	MHz
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature Range	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2SD1815-S-TP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Collector current rating of 3 A (maximum)
Collector-emitter breakdown voltage of 100 V (maximum)
NPN transistor type
Surface mount DPAK package configuration

Substitution Categories:

Direct Equivalent (Functional Replacement): The 2SD1815S-TL-E from onsemi maintains identical electrical ratings (3 A, 100 V) and DPAK packaging. This part is active in production status and provides direct functional substitution with equivalent saturation characteristics and transition frequency.

Similar Substitutes (Parameter Variance): The MJD31 series parts (MJD31CT4G, MJD31CRLG, MJD31CG) share the same collector current (3 A) and breakdown voltage (100 V) ratings with identical DPAK packaging. These parts are active in production. Differences exist in transition frequency (3 MHz versus 180 MHz), power dissipation (1.56 W versus 1 W), and DC current gain characteristics. These parts are suitable for applications where the lower transition frequency does not impact circuit performance.

Parameter Comparison

Parameter	2SD1815-S-TP	2SD1815S-TL-E	MJD31CT4G	MJD31CRLG	MJD31CG
Manufacturer	Micro Commercial Co	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN
Ic (Max)	3 A	3 A	3 A	3 A	3 A
Vce Breakdown (Max)	100 V	100 V	100 V	100 V	100 V
Power (Max)	1 W	1 W	1.56 W	1.56 W	1.56 W
Frequency - Transition	180 MHz	180 MHz	3 MHz	3 MHz	3 MHz
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Operating Temperature	-55 to 150°C	150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	—	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tube

Engineering Selection Recommendations

For Direct Functional Replacement:

The 2SD1815S-TL-E is the primary substitute for the obsolete 2SD1815-S-TP. Both parts maintain identical electrical specifications (3 A, 100 V, 180 MHz, 1 W) and DPAK packaging. The 2SD1815S-TL-E is manufactured by onsemi with active production status, ensuring long-term availability. Both parts are ROHS3 compliant and carry MSL 1 (unlimited moisture sensitivity level) ratings. The 2SD1815S-TL-E is available in Tape & Reel packaging, suitable for automated assembly processes.

For Applications with Lower Frequency Requirements:

The MJD31 series (MJD31CT4G, MJD31CRLG, MJD31CG) provides substitution for applications where transition frequency below 180 MHz is acceptable. These parts maintain the same current and voltage ratings with enhanced power dissipation capability (1.56 W versus 1 W). All MJD31 variants are active in production from onsemi, ROHS3 compliant, and available in multiple packaging formats (Cut Tape, Digi-Reel, and Tube). The MJD31 series supports extended lower operating temperature range (-65°C versus -55°C minimum).

Compliance and Availability:

All substitute parts listed are ROHS3 compliant and carry EAR99 ECCN classification matching the original part. Inventory availability is confirmed for all active substitutes, with MJD31CT4G offering the highest stock level (35,200 pieces).

Frequently Asked Questions (FAQ)

Q: Can the 2SD1815S-TL-E directly replace the 2SD1815-S-TP without circuit modification?

A: Yes. The 2SD1815S-TL-E maintains identical electrical ratings (3 A collector current, 100 V breakdown voltage, 180 MHz transition frequency, 1 W power dissipation) and DPAK package configuration. No circuit modifications are required for direct substitution.

Q: What is the primary difference between the 2SD1815S-TL-E and the MJD31 series substitutes?

A: The 2SD1815S-TL-E maintains the 180 MHz transition frequency of the original part. The MJD31 series (MJD31CT4G, MJD31CRLG, MJD31CG) operates at 3 MHz transition frequency. Selection depends on circuit frequency requirements. Both maintain identical current and voltage ratings.

Q: Are all substitute parts available in the same DPAK package?

A: Yes. All substitute parts use the TO-252-3 DPAK (2 Leads + Tab) package configuration. Packaging formats differ (Tape & Reel, Cut Tape, Digi-Reel, Tube), but the physical component package remains identical.

Q: Do the MJD31 series parts offer any advantages over the 2SD1815S-TL-E?

A: The MJD31 series provides higher power dissipation capability (1.56 W versus 1 W) and extended lower operating temperature range (-65°C versus -55°C minimum). These advantages apply only to applications requiring these enhanced specifications.

Q: Are all substitute parts RoHS compliant?

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

Q: What packaging options are available for production assembly?

A: The 2SD1815S-TL-E is available in Tape & Reel format for automated assembly. The MJD31CT4G and MJD31CRLG are available in Cut Tape and Digi-Reel formats. The MJD31CG is available in Tube packaging. Selection depends on assembly process requirements.

Q: Can the MJD31 series be used in high-frequency switching applications?

A: The MJD31 series operates at 3 MHz transition frequency, significantly lower than the original 2SD1815-S-TP (180 MHz). Use in high-frequency applications requires circuit analysis to confirm frequency compatibility. For applications requiring 180 MHz operation, the 2SD1815S-TL-E is the appropriate substitute.

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