2STR2215 Equivalent & Substitute Parts

Part Overview

The 2STR2215 is a Surface Mount PNP Bipolar Junction Transistor (BJT) manufactured by STMicroelectronics, rated for 15 V collector-emitter breakdown voltage and 1.5 A maximum collector current. The device is packaged in SOT-23-3 (TO-236-3) configuration with a maximum power dissipation of 500 mW. The 2STR2215 is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified voltage, current, and power parameters while meeting RoHS3 compliance and surface mount packaging requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	15	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	500	mW
Vce Saturation (Max) @ Ib, Ic	850mV @ 200mA, 2A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 500mA, 2V	—
Package / Case	SOT-23-3 (TO-236-3)	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2STR2215 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP configuration required
Voltage Rating: Collector-Emitter breakdown voltage must equal or exceed 15 V
Current Rating: Maximum collector current must equal or exceed 1.5 A
Power Dissipation: Maximum power rating must equal or exceed 500 mW
Package: SOT-23-3 (TO-236-3) surface mount configuration
DC Current Gain: Minimum hFE of 200 at specified operating point
Compliance: RoHS3 compliant, MSL 1 (Unlimited)

Substitution Groups:

Group 1 - Direct Electrical Equivalents (15 V, ≥1.5 A): Parts meeting or exceeding the 2STR2215 specifications for voltage, current, and power within the same package. These include ZXTP25015DFHTA (4 A, 1.25 W), ZXTP23015CFHTA (5 A, 1.25 W), and PBSS5320T,215 (2 A, 540 mW).

Group 2 - Lower Current Alternatives (40 V, 0.2 A): Parts with higher voltage ratings but reduced current capacity. These include MMBT3906LT1G, MMBT3906LT3G, SMMBT3906LT1G, and SMMBT3906LT3G. These are suitable only for applications where collector current does not exceed 200 mA.

Group 3 - Higher Voltage Alternatives (300 V, 0.5 A): Parts with significantly elevated voltage ratings but reduced current capacity. These include MMBTA92LT1G and MMBTA92LT3G. These are suitable only for applications where collector current does not exceed 500 mA.

Group 4 - Higher Current Alternatives (15 V, 6 A): Parts with elevated current capacity. CPH3107-TL-E provides 6 A at 15 V, suitable for applications requiring higher current handling.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce(br) [V]	Power [mW]	Vce Sat [mV]	hFE (Min)	Package	Status
2STR2215	STMicroelectronics	1.5	15	500	850 @ 200mA, 2A	200 @ 500mA, 2V	SOT-23-3	Obsolete
ZXTP25015DFHTA	Diodes Incorporated	4	15	1250	220 @ 500mA, 5A	300 @ 10mA, 2V	SOT-23-3	Active
ZXTP23015CFHTA	Diodes Incorporated	5	15	1250	190 @ 240mA, 6A	200 @ 500mA, 2V	SOT-23-3	Active
PBSS5320T,215	Nexperia USA Inc.	2	20	540	300 @ 300mA, 3A	200 @ 1A, 2V	SOT-23-3	Active
CPH3107-TL-E	onsemi	6	15	900	150 @ 60mA, 3A	200 @ 500mA, 2V	SOT-23-3	Obsolete
MMBT3906LT1G	onsemi	0.2	40	300	400 @ 5mA, 50mA	100 @ 10mA, 1V	SOT-23-3	Active
MMBT3906LT3G	onsemi	0.2	40	300	400 @ 5mA, 50mA	100 @ 10mA, 1V	SOT-23-3	Active
SMMBT3906LT1G	onsemi	0.2	40	300	400 @ 5mA, 50mA	100 @ 10mA, 1V	SOT-23-3	Active
SMMBT3906LT3G	onsemi	0.2	40	300	400 @ 5mA, 50mA	100 @ 10mA, 1V	SOT-23-3	Active
MMBTA92LT1G	onsemi	0.5	300	300	500 @ 2mA, 20mA	25 @ 30mA, 10V	SOT-23-3	Active
MMBTA92LT3G	onsemi	0.5	300	300	500 @ 2mA, 20mA	25 @ 30mA, 10V	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Electrical Equivalents:

For applications requiring the full electrical specification of the 2STR2215 (15 V, 1.5 A, 500 mW), the following active alternatives are recommended:

ZXTP25015DFHTA (Diodes Incorporated) - Provides 4 A at 15 V with 1.25 W power dissipation. Exceeds 2STR2215 specifications across all critical parameters. Active product status with RoHS3 compliance and unlimited MSL rating. Inventory availability: 119,200 units.
ZXTP23015CFHTA (Diodes Incorporated) - Provides 5 A at 15 V with 1.25 W power dissipation. Exceeds 2STR2215 specifications with matching DC current gain. Active product status with RoHS3 compliance. Inventory availability: 12,200 units.
PBSS5320T,215 (Nexperia USA Inc.) - Provides 2 A at 20 V with 540 mW power dissipation. Meets or exceeds 2STR2215 current and power specifications with higher voltage margin. Active product status with RoHS3 compliance. Inventory availability: 8,634 units.

Secondary Recommendation - Reduced Current Applications:

For applications where collector current does not exceed 200 mA, the MMBT3906 series (MMBT3906LT1G, MMBT3906LT3G, SMMBT3906LT1G, SMMBT3906LT3G) provides active alternatives with higher voltage ratings (40 V) and extended temperature range (-55°C to 150°C). SMMBT3906 variants include AEC-Q101 automotive qualification. These parts are suitable only for low-current signal switching applications.

Tertiary Recommendation - Reduced Current, High Voltage Applications:

For applications where collector current does not exceed 500 mA and high voltage isolation is required, MMBTA92LT1G and MMBTA92LT3G provide 300 V ratings with active product status and extended temperature range.

Not Recommended:

CPH3107-TL-E, while providing higher current capacity (6 A), carries obsolete product status classification, limiting its suitability for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q1: Can MMBT3906LT1G directly replace the 2STR2215?

A: No. The MMBT3906LT1G is rated for maximum 200 mA collector current, while the 2STR2215 is rated for 1.5 A. Direct substitution is only valid for applications where collector current does not exceed 200 mA. For full 1.5 A operation, ZXTP25015DFHTA, ZXTP23015CFHTA, or PBSS5320T,215 are required.

Q2: What is the difference between MMBT3906LT1G and SMMBT3906LT1G?

A: Both parts have identical electrical specifications (40 V, 200 mA, 300 mW). The SMMBT3906LT1G includes AEC-Q101 automotive qualification and is suitable for automotive applications. Selection depends on application requirements and qualification standards.

Q3: Why does ZXTP25015DFHTA have lower saturation voltage than the 2STR2215?

A: The ZXTP25015DFHTA exhibits lower saturation voltage (220 mV @ 500mA, 5A) compared to the 2STR2215 (850 mV @ 200mA, 2A) due to superior transistor design and higher current capacity. This represents improved performance and is not a compatibility issue.

Q4: Can MMBTA92LT1G be used in place of the 2STR2215?

A: MMBTA92LT1G is suitable only for applications where collector current does not exceed 500 mA. The 300 V voltage rating provides higher isolation margin but reduced current capacity. Direct substitution is not valid for 1.5 A applications.

Q5: What packaging considerations apply to these substitutes?

A: All listed substitute parts use SOT-23-3 (TO-236-3) surface mount packaging, identical to the 2STR2215. Pin configuration and PCB footprint compatibility are maintained across all alternatives. No layout modifications are required.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification. The 2STR2215 and CPH3107-TL-E also carry RoHS3 compliance, though both are classified as obsolete.

Q7: Which substitute provides the best direct replacement for the 2STR2215?

A: ZXTP25015DFHTA provides the most comprehensive direct replacement, exceeding 2STR2215 specifications in current (4 A vs. 1.5 A), voltage (15 V matching), and power (1.25 W vs. 500 mW) while maintaining active product status and full inventory availability.

Q8: What is the operating temperature range for substitute parts?

A: The 2STR2215 operates to 150°C maximum junction temperature. ZXTP25015DFHTA and ZXTP23015CFHTA extend this to -55°C to 150°C. MMBT3906 and MMBTA92 series also provide -55°C to 150°C range. PBSS5320T,215 operates to 150°C maximum, matching the original part.

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