2SD1815-Q-TP Equivalent & Substitute Parts

Part Overview

The 2SD1815-Q-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 100V collector-emitter breakdown voltage and 3A maximum collector current. This device is packaged in a DPAK (TO-252-3) surface mount configuration and is designed for general-purpose switching and amplification applications requiring 1W power dissipation at frequencies up to 180MHz.

The 2SD1815-Q-TP is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor specification.

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
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 500mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	400mV @ 150mA, 1.5A	—
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-252-3, DPAK	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 2SD1815-Q-TP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or near-identical electrical characteristics, including transition frequency (180MHz), DC current gain (hFE = 70 @ 500mA, 5V), and saturation voltage (400mV @ 150mA, 1.5A). These parts are direct functional replacements with the same performance envelope.

Similar Substitutes share the core electrical ratings (100V breakdown, 3A collector current, DPAK package) but differ in transition frequency (3MHz to 120MHz), DC current gain, saturation voltage, and power dissipation capability (1.56W to 15W). These parts are electrically compatible for applications where the specific frequency response and gain characteristics of the original part are not critical design constraints.

All substitute parts maintain the following compatibility criteria:

NPN transistor type
100V maximum collector-emitter breakdown voltage
3A maximum collector current
DPAK surface mount package (TO-252-3)
ROHS3 compliance
Moisture Sensitivity Level 1 (Unlimited)

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency (Transition)	hFE (Min)	Vce Sat (Max)	Product Status	RoHS Status
2SD1815-Q-TP	Micro Commercial Co	3 A	100 V	1 W	180 MHz	70 @ 500mA, 5V	400mV @ 150mA, 1.5A	Obsolete	ROHS3
2SD1815S-TL-E	onsemi	3 A	100 V	1 W	180 MHz	70 @ 500mA, 5V	400mV @ 150mA, 1.5A	Active	ROHS3
2SD1815T-TL-E	onsemi	3 A	100 V	1 W	180 MHz	70 @ 500mA, 5V	400mV @ 150mA, 1.5A	Obsolete	ROHS3
NSS1C301ET4G	onsemi	3 A	100 V	2.1 W	120 MHz	120 @ 1A, 2V	250mV @ 300mA, 3A	Active	ROHS3
MJD31CG	onsemi	3 A	100 V	1.56 W	3 MHz	10 @ 3A, 4V	1.2V @ 375mA, 3A	Active	ROHS3
MJD31CRLG	onsemi	3 A	100 V	1.56 W	3 MHz	10 @ 3A, 4V	1.2V @ 375mA, 3A	Active	ROHS3
MJD31CT4	onsemi	3 A	100 V	15 W	3 MHz	10 @ 3A, 4V	1.2V @ 375mA, 3A	Obsolete	Non-compliant
MJD31CT4G	onsemi	3 A	100 V	1.56 W	3 MHz	10 @ 3A, 4V	1.2V @ 375mA, 3A	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: 2SD1815S-TL-E

The 2SD1815S-TL-E is the optimal substitute for the 2SD1815-Q-TP. This part is manufactured by onsemi and maintains identical electrical specifications across all critical parameters: 180MHz transition frequency, 70 hFE minimum at 500mA/5V, 400mV saturation voltage, and 1W power rating. The 2SD1815S-TL-E is classified as Active product status, ensuring long-term availability and supply chain continuity. ROHS3 compliance is maintained. The primary difference is packaging format (Tape & Reel vs. unspecified for the original), which does not affect electrical performance or board-level compatibility in DPAK surface mount applications.

Secondary Recommendation: NSS1C301ET4G

The NSS1C301ET4G is an active onsemi product offering enhanced performance characteristics suitable for applications where higher transition frequency (120MHz) and improved DC current gain (120 @ 1A, 2V) provide design margin. This part maintains 100V/3A ratings and ROHS3 compliance. The 2.1W power rating exceeds the original specification, providing thermal headroom. The lower saturation voltage (250mV @ 300mA, 3A) compared to the original (400mV @ 150mA, 1.5A) indicates improved switching efficiency. This part is appropriate for designs where frequency response and gain characteristics are not tightly constrained to the original 180MHz specification.

Alternative Consideration: MJD31CT4G

The MJD31CT4G is an active onsemi product in ROHS3 compliance. While this part shares the 100V/3A core ratings and DPAK package, it operates at significantly lower transition frequency (3MHz) and exhibits lower DC current gain (10 @ 3A, 4V). The MJD31CT4G is suitable only for low-frequency switching applications where the 180MHz transition frequency of the original part is not required. Higher saturation voltage (1.2V @ 375mA, 3A) indicates reduced switching efficiency compared to the original specification.

Not Recommended: MJD31CT4

The MJD31CT4 is classified as obsolete and is not ROHS3 compliant, making it unsuitable for new designs or applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 2SD1815S-TL-E directly replace the 2SD1815-Q-TP in existing designs?

A: Yes. The 2SD1815S-TL-E maintains identical electrical specifications for all critical parameters: 100V breakdown voltage, 3A collector current, 180MHz transition frequency, 70 hFE minimum, and 400mV saturation voltage. Both devices are packaged in DPAK surface mount configuration. The only difference is packaging format (Tape & Reel), which does not affect electrical performance or PCB-level compatibility.

Q: What is the primary difference between parametric equivalents and similar substitutes?

A: Parametric equivalents (2SD1815S-TL-E, 2SD1815T-TL-E) maintain identical electrical characteristics across all specified parameters, including transition frequency and DC current gain. Similar substitutes (MJD31 series, NSS1C301ET4G) share the core voltage and current ratings but differ in frequency response, gain, and saturation characteristics. Selection depends on whether the application requires the specific frequency and gain performance of the original part.

Q: Is the NSS1C301ET4G suitable for high-frequency applications?

A: The NSS1C301ET4G operates at 120MHz transition frequency, which is lower than the original 2SD1815-Q-TP (180MHz). For applications requiring operation at or above 180MHz, the 2SD1815S-TL-E is the appropriate choice. The NSS1C301ET4G is suitable for applications operating below 120MHz where its enhanced power rating (2.1W) and improved saturation voltage (250mV) provide design advantages.

Q: Why is the MJD31CT4 not recommended as a substitute?

A: The MJD31CT4 is classified as obsolete and does not meet ROHS3 compliance requirements. Additionally, its 3MHz transition frequency and 10 hFE minimum are significantly lower than the original part's 180MHz and 70 hFE specifications, making it unsuitable for applications requiring the original part's frequency response and gain characteristics.

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

A: Yes. All substitute parts listed are packaged in TO-252-3 DPAK surface mount configuration, ensuring mechanical and board-level compatibility with the original 2SD1815-Q-TP. Packaging format variations (Tube, Cut Tape & Digi-Reel, Tape & Reel) do not affect electrical performance or PCB mounting compatibility.

Q: What is the operating temperature range for substitute parts?

A: The 2SD1815S-TL-E and 2SD1815T-TL-E operate from -55°C to 150°C, matching the original part. The MJD31 series and NSS1C301ET4G operate from -65°C to 150°C, providing extended low-temperature capability. All parts maintain rated electrical specifications across their respective operating ranges.

Q: Are all substitute parts ROHS3 compliant?

A: The 2SD1815S-TL-E, 2SD1815T-TL-E, NSS1C301ET4G, MJD31CG, MJD31CRLG, and MJD31CT4G are ROHS3 compliant. The MJD31CT4 is not ROHS3 compliant and is not recommended for new designs or applications requiring regulatory compliance.

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