2SD1815T-TL-E Equivalent & Substitute Parts

Part Overview

The 2SD1815T-TL-E is an NPN bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 3 A maximum collector current. This surface mount device in TO-252-3 (DPAK) packaging is designed for general-purpose switching and amplification applications requiring 1 W power dissipation capability.

The 2SD1815T-TL-E is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing production requirements, field repairs, and design continuity. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

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
Vce Saturation (Max) @ Ib, Ic	400 mV @ 150 mA, 1.5 A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 500 mA, 5 V	—
Operating Temperature (Max)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—

Substitute Part Grouping Explanation

Substitution of the 2SD1815T-TL-E is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor Type: NPN (complementary PNP devices are not direct substitutes)
Voltage - Collector Emitter Breakdown (Max): 100 V minimum
Current - Collector (Ic) (Max): 3 A minimum
Power - Max: 1 W minimum
DC Current Gain (hFE) (Min): 70 or greater at specified test conditions
Vce Saturation: 400 mV or lower at rated conditions

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The 2SD1815S-TL-E is the manufacturer-recommended direct equivalent, sharing identical electrical specifications and package configuration while maintaining active product status. This part is the preferred replacement for the obsolete 2SD1815T-TL-E.

The MJD32CT4, MJD32C-13, MJD32C-TP, and MJD32CQ-13 are listed as similar parts but operate as PNP transistors. These devices are not direct functional substitutes due to opposite polarity (PNP vs. NPN) and therefore cannot replace the 2SD1815T-TL-E in circuits designed for NPN operation.

Parameter Comparison

Parameter	2SD1815T-TL-E	2SD1815S-TL-E	MJD32CT4	MJD32C-13	MJD32C-TP	MJD32CQ-13
Manufacturer	onsemi	onsemi	STMicroelectronics	Diodes Incorporated	Micro Commercial Co	Diodes Incorporated
Transistor Type	NPN	NPN	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V	100 V	100 V
Current - Collector (Ic) (Max)	3 A	3 A	3 A	3 A	3 A	3 A
Power - Max	1 W	1 W	15 W	15 W	1.25 W	15 W
Frequency - Transition	180 MHz	180 MHz	—	3 MHz	3 MHz	3 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 500 mA, 5 V	70 @ 500 mA, 5 V	10 @ 3 A, 4 V	10 @ 3 A, 4 V	10 @ 3 A, 4 V	10 @ 3 A, 4 V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 150 mA, 1.5 A	400 mV @ 150 mA, 1.5 A	1.2 V @ 375 mA, 3 A	1.2 V @ 375 mA, 3 A	1.2 V @ 375 mA, 3 A	1.2 V @ 375 mA, 3 A
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 2SD1815S-TL-E

The 2SD1815S-TL-E is the direct equivalent replacement for the obsolete 2SD1815T-TL-E. This part is manufactured by onsemi and maintains identical electrical specifications including NPN polarity, 100 V breakdown voltage, 3 A collector current rating, 1 W power dissipation, 180 MHz transition frequency, and 70 minimum DC current gain. The package configuration (TO-252-3, DPAK) is identical. The 2SD1815S-TL-E carries active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant with MSL 1 rating. The only difference is packaging format: the 2SD1815S-TL-E is supplied in Tape & Reel (TR) format, whereas the original 2SD1815T-TL-E was supplied in standard packaging.

Alternative Consideration: MJD32 Series Parts

The MJD32CT4, MJD32C-13, MJD32C-TP, and MJD32CQ-13 are not suitable direct replacements for the 2SD1815T-TL-E. These devices are PNP transistors, whereas the 2SD1815T-TL-E is an NPN transistor. Polarity incompatibility prevents functional substitution in circuits designed for NPN operation. Additionally, these PNP devices exhibit significantly lower DC current gain (10 vs. 70) and higher saturation voltage (1.2 V vs. 400 mV), resulting in different circuit behavior and performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the MJD32CT4 or other MJD32 series parts replace the 2SD1815T-TL-E?

A: No. The MJD32 series consists of PNP transistors, while the 2SD1815T-TL-E is an NPN transistor. Transistor polarity is a fundamental characteristic that determines circuit operation. PNP and NPN devices cannot be interchanged without complete circuit redesign. Additionally, the MJD32 series exhibits different electrical characteristics including lower current gain and higher saturation voltage.

Q: What is the difference between 2SD1815T-TL-E and 2SD1815S-TL-E?

A: Both parts are manufactured by onsemi and share identical electrical specifications and package configuration. The primary difference is packaging format: 2SD1815T-TL-E was supplied in standard packaging, while 2SD1815S-TL-E is supplied in Tape & Reel (TR) format. The 2SD1815S-TL-E maintains active product status, making it the recommended replacement for the obsolete 2SD1815T-TL-E.

Q: Are all substitute parts in the same package?

A: Yes. All listed parts use the TO-252-3 (DPAK) surface mount package with 2 leads plus tab configuration. This ensures mechanical compatibility for PCB assembly and thermal management. Packaging format (Cut Tape, Tape & Reel, or standard) does not affect electrical performance or board-level functionality.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. These certifications match the original 2SD1815T-TL-E specifications, ensuring compatibility with modern manufacturing and environmental standards.

Q: Why does the 2SD1815S-TL-E have lower inventory than the original part?

A: The 2SD1815T-TL-E is classified as obsolete, and existing inventory represents remaining stock. The 2SD1815S-TL-E is the active replacement part and represents current manufacturing availability. Active product status ensures continued supply for future requirements.

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