2STR1215 Equivalent & Substitute Parts

Part Overview

The 2STR1215 is an NPN bipolar junction transistor (BJT) manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. This surface mount device operates at a maximum collector current of 1.5 A with a collector-emitter breakdown voltage of 15 V and maximum power dissipation of 500 mW. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching or exceeding the electrical and mechanical specifications required for direct circuit replacement or functional equivalence in target applications.

Key Parameters

Parameter	2STR1215 Specification
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	15 V
Current - Collector (Ic) (Max)	1.5 A
Power - Max	500 mW
Vce Saturation (Max) @ Ib, Ic	850 mV @ 200 mA, 2 A
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 500 mA, 2 V
Current - Collector Cutoff (Max)	100 nA (ICBO)
Operating Temperature Range	-65°C to 150°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 2STR1215 are grouped based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Package / Case: TO-236-3, SC-59, or SOT-23-3 (required match for mechanical compatibility)
Voltage - Collector Emitter Breakdown: Equal to or greater than 15 V
Current - Collector (Ic) (Max): Equal to or greater than 1.5 A
Power - Max: Equal to or greater than 500 mW
Mounting Type: Surface Mount (required match)
RoHS Status: ROHS3 Compliant (required match)
Moisture Sensitivity Level: MSL 1 (required match)

Substitution Logic: Parts meeting all primary criteria are classified as direct substitutes. Parts exceeding one or more electrical parameters (voltage, current, or power) while maintaining package compatibility and compliance certifications are classified as functional equivalents suitable for direct replacement. Parts with reduced electrical specifications are identified separately and noted for application-specific evaluation.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Package	Operating Temp	RoHS Status	MSL
2STR1215	STMicroelectronics	NPN	1.5 A	15 V	500 mW	SOT-23-3	-65°C to 150°C	ROHS3	1
2SD1048-6-TB-E	onsemi	NPN	700 mA	15 V	200 mW	SOT-23-3	-55°C to 125°C	ROHS3	1
FMMT617TA	Diodes Incorporated	NPN	3 A	15 V	625 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBT2484LT1G	onsemi	NPN	100 mA	60 V	225 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBT2484LT3G	onsemi	NPN	100 mA	60 V	225 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBT3904LT1G	onsemi	NPN	200 mA	40 V	300 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBT3904LT3G	onsemi	NPN	200 mA	40 V	300 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBT6429LT1G	onsemi	NPN	200 mA	45 V	225 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBTA06LT1G	onsemi	NPN	500 mA	80 V	225 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBTA06LT3G	onsemi	NPN	500 mA	80 V	225 mW	SOT-23-3	-55°C to 150°C	ROHS3	1
MMBTA42LT1G	onsemi	NPN	500 mA	300 V	225 mW	SOT-23-3	-55°C to 150°C	ROHS3	1

Engineering Selection Recommendations

Direct Substitutes (Electrical and Mechanical Compatibility):

The FMMT617TA from Diodes Incorporated is the primary direct substitute for the 2STR1215. This part exceeds the collector current specification (3 A versus 1.5 A) and power dissipation (625 mW versus 500 mW) while maintaining the same 15 V collector-emitter breakdown voltage and SOT-23-3 package. Both parts are ROHS3 compliant with MSL 1 rating and operate across overlapping temperature ranges (-55°C to 150°C for FMMT617TA versus -65°C to 150°C for 2STR1215).

Functional Equivalents (Reduced Current Specifications):

The 2SD1048-6-TB-E from onsemi operates at the same 15 V collector-emitter breakdown voltage in an identical SOT-23-3 package with ROHS3 compliance and MSL 1 rating. However, this part is rated for 700 mA maximum collector current and 200 mW power dissipation, both below the 2STR1215 specifications. This part is suitable for applications where the 2STR1215 current and power ratings exceed circuit requirements.

Limited Substitution (Reduced Current and Power):

The MMBT3904LT1G and MMBT3904LT3G from onsemi are rated for 200 mA collector current and 300 mW power dissipation with a 40 V collector-emitter breakdown voltage. These parts exceed the voltage specification but fall below the current and power requirements of the 2STR1215. The MMBT2484LT1G and MMBT2484LT3G are rated for only 100 mA collector current and 225 mW power dissipation with 60 V breakdown voltage. The MMBT6429LT1G is rated for 200 mA and 225 mW with 45 V breakdown voltage. The MMBTA06LT1G and MMBTA06LT3G are rated for 500 mA and 225 mW with 80 V breakdown voltage. The MMBTA42LT1G is rated for 500 mA and 225 mW with 300 V breakdown voltage. These parts are not recommended as direct substitutes for applications requiring the full 1.5 A current capability of the 2STR1215.

All substitute parts listed maintain ROHS3 compliance, MSL 1 rating, and surface mount SOT-23-3 packaging, ensuring compliance and mechanical compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can the FMMT617TA directly replace the 2STR1215 in all applications?

A: The FMMT617TA is electrically and mechanically compatible with the 2STR1215. It exceeds the current (3 A versus 1.5 A) and power (625 mW versus 500 mW) specifications while maintaining the same 15 V breakdown voltage and SOT-23-3 package. Direct replacement is supported from an electrical standpoint. Thermal management considerations may differ due to higher power capability; circuit design should account for this difference.

Q: Why are some substitute parts rated for lower collector current than the 2STR1215?

A: Parts such as the MMBT3904LT1G (200 mA) and MMBT2484LT1G (100 mA) are included in the substitute list because they share the same SOT-23-3 package and NPN transistor type with ROHS3 compliance and MSL 1 rating. These parts are suitable for applications where circuit requirements do not demand the full 1.5 A capability of the 2STR1215. Selection depends on actual circuit current requirements.

Q: Are packaging differences between Cut Tape (CT) and Tape & Reel (TR) significant for substitution?

A: Packaging format (Cut Tape versus Tape & Reel) affects supply chain and handling but does not impact electrical or mechanical compatibility. Both formats use the same SOT-23-3 component package. Selection between CT and TR variants depends on manufacturing volume and assembly process requirements, not circuit performance.

Q: What is the significance of the operating temperature range difference between the 2STR1215 (-65°C to 150°C) and most substitute parts (-55°C to 150°C)?

A: The 2STR1215 operates at a lower minimum temperature (-65°C) compared to most onsemi substitutes (-55°C). For applications requiring operation below -55°C, the 2STR1215 or FMMT617TA (which also supports -55°C to 150°C) should be selected. For applications within the -55°C to 150°C range, substitute parts are fully compatible.

Q: Can the MMBTA42LT1G be used as a substitute despite its 300 V breakdown voltage specification?

A: The MMBTA42LT1G exceeds the 15 V breakdown voltage requirement with a 300 V rating. While this part is mechanically compatible (SOT-23-3 package) and compliant (ROHS3, MSL 1), it is rated for only 500 mA collector current and 225 mW power dissipation, both below the 2STR1215 specifications. This part is not recommended for applications requiring the full 1.5 A current capability.

Q: Are all listed substitute parts ROHS3 compliant and MSL 1 rated?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity) rating, matching the compliance profile of the 2STR1215. This ensures regulatory and environmental compatibility across all listed alternatives.

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