2STF2280 Equivalent & Substitute Parts

Part Overview

The 2STF2280 is a PNP bipolar junction transistor manufactured by STMicroelectronics, rated for 80 V collector-emitter breakdown voltage and 2 A maximum collector current. The device is housed in a Surface Mount SOT-89 package and delivers 1.4 W maximum power dissipation with a 50 MHz transition frequency. The 2STF2280 is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal operating ranges while accommodating the same or compatible package footprints.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	2	A
Power - Max	1.4	W
Frequency - Transition	50	MHz
Operating Temperature Range	-65 to 150	°C
Package / Case	TO-243AA (SOT-89)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2STF2280 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must be greater than or equal to 80 V
Maximum collector current must be greater than or equal to 2 A
Package must be TO-243AA (SOT-89 or SOT-89-3 variants)
Surface mount mounting type
Operating temperature range must encompass or exceed -65°C to 150°C
RoHS3 compliance required

Secondary Compatibility Factors:

Power dissipation rating should meet or exceed 1.4 W
Transition frequency should support the intended application bandwidth
Vce saturation characteristics must be acceptable for the circuit topology

Parts are grouped into two categories: Direct Equivalents (matching all primary criteria with active product status) and Functional Alternatives (meeting primary criteria with enhanced specifications).

Parameter Comparison

Parameter	2STF2280 (Main)	2SAR544PT100	BCX5316TA	BCX53TA	BSR33TA	ZXTP03200BZTA
Manufacturer	STMicroelectronics	Rohm Semiconductor	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V	80 V	80 V	200 V
Current - Collector (Ic) (Max)	2 A	2.5 A	1 A	1 A	1 A	2 A
Power - Max	1.4 W	2 W	1 W	1 W	1 W	1.1 W
Frequency - Transition	50 MHz	280 MHz	150 MHz	150 MHz	100 MHz	105 MHz
Operating Temperature Range	-65 to 150°C	to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-55 to 150°C
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89	MPT3	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

2SAR544PT100 (Rohm Semiconductor)

The 2SAR544PT100 is an active PNP transistor with 80 V breakdown voltage and 2.5 A maximum collector current, exceeding the 2 A specification of the 2STF2280. This part provides enhanced current handling capacity and superior transition frequency (280 MHz versus 50 MHz). The device is ROHS3 compliant with MSL 1 rating. The 2SAR544PT100 is suitable for direct replacement in applications where the higher current rating and frequency response provide design margin. Operating temperature extends to 150°C maximum.

ZXTP03200BZTA (Diodes Incorporated)

The ZXTP03200BZTA is an active PNP transistor rated for 200 V collector-emitter breakdown voltage and 2 A maximum collector current. This part is applicable in circuits where higher voltage headroom is required while maintaining the 2 A current specification. The device delivers 1.1 W power dissipation and 105 MHz transition frequency. ROHS3 compliance and MSL 1 rating are confirmed. Operating temperature range is -55°C to 150°C, which covers the upper operating range of the 2STF2280 but does not extend to the lower -65°C limit.

BCX5316TA (Diodes Incorporated)

The BCX5316TA is an active PNP transistor with 80 V breakdown voltage and 1 A maximum collector current. This part is suitable for applications where collector current does not exceed 1 A. The device provides 150 MHz transition frequency and 1 W power dissipation. Full operating temperature range of -65°C to 150°C is supported. ROHS3 compliance and MSL 1 rating apply. This part is appropriate for lower-current circuit implementations.

BCX53TA (Diodes Incorporated)

The BCX53TA is an active PNP transistor with 80 V breakdown voltage and 1 A maximum collector current, functionally equivalent to the BCX5316TA. The device supports 150 MHz transition frequency and 1 W power dissipation across the full -65°C to 150°C operating range. ROHS3 compliance and MSL 1 rating are confirmed. Packaging is Tape & Reel (TR) format.

BSR33TA (Diodes Incorporated)

The BSR33TA is an active PNP transistor with 80 V breakdown voltage and 1 A maximum collector current. This part delivers 100 MHz transition frequency and 1 W power dissipation. Full operating temperature range of -65°C to 150°C is supported. ROHS3 compliance and MSL 1 rating apply. This part is suitable for applications with collector current requirements not exceeding 1 A.

Frequently Asked Questions (FAQ)

Q: Can the 2SAR544PT100 directly replace the 2STF2280 in all applications?

A: The 2SAR544PT100 meets the primary electrical substitution criteria: PNP type, 80 V breakdown voltage, and 2.5 A maximum collector current (exceeding the 2 A requirement). Both devices are housed in TO-243AA packages. However, the operating temperature range of the 2SAR544PT100 extends only to 150°C maximum, whereas the 2STF2280 specifies -65°C to 150°C. Substitution is valid for applications operating within the 2SAR544PT100 temperature range.

Q: Why do BCX5316TA, BCX53TA, and BSR33TA have lower maximum collector current ratings?

A: These parts are rated for 1 A maximum collector current, compared to the 2 A specification of the 2STF2280. These devices are functional alternatives suitable only for circuits where the collector current requirement does not exceed 1 A. They are not suitable for applications requiring the full 2 A capability.

Q: Is the ZXTP03200BZTA suitable for 80 V applications?

A: The ZXTP03200BZTA is rated for 200 V collector-emitter breakdown voltage, which exceeds the 80 V requirement. This part is suitable for applications operating at 80 V and below. The higher voltage rating provides additional design margin but does not affect compatibility with 80 V circuits. The lower operating temperature limit of -55°C (versus -65°C for the 2STF2280) must be considered for applications requiring extended low-temperature operation.

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

A: All substitute parts are housed in TO-243AA packages (SOT-89 or SOT-89-3 variants). The physical footprint is compatible across all listed alternatives. Supplier device package designations vary (SOT-89, SOT-89-3, MPT3) but all conform to the TO-243AA standard, ensuring PCB layout compatibility.

Q: What is the significance of the transition frequency differences?

A: The 2STF2280 specifies 50 MHz transition frequency. Substitute parts range from 100 MHz (BSR33TA) to 280 MHz (2SAR544PT100). Higher transition frequency indicates faster switching capability and broader bandwidth. For applications operating below 50 MHz, all substitute parts are compatible. For applications requiring specific frequency response characteristics, the transition frequency specification must be evaluated against circuit requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the 2STF2280. This ensures compatibility with modern manufacturing and environmental standards.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: The 2STF2280 is available in Cut Tape and Digi-Reel packaging. The 2SAR544PT100 is available in Cut Tape and Digi-Reel. The BCX5316TA is available in Cut Tape and Digi-Reel. The BCX53TA, BSR33TA, and ZXTP03200BZTA are available in Tape & Reel format. Both packaging formats contain identical components; the difference is in the delivery method. Cut Tape is suitable for manual assembly or small-volume production, while Tape & Reel is optimized for automated pick-and-place assembly.

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