STF715 Equivalent & Substitute Parts

Part Overview

The STF715 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for surface mount applications in the SOT-89-3 package. This device operates at a maximum collector-emitter voltage of 80 V with a maximum collector current of 1.5 A and a power dissipation rating of 1.4 W. The STF715 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain electrical compatibility across voltage, current, and power specifications while conforming to the same physical package standard.

Key Parameters

Parameter	STF715 Specification
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V
Current - Collector (Ic) (Max)	1.5 A
Power - Max	1.4 W
Frequency - Transition	50 MHz
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 1A, 2V
Package / Case	TO-243AA (SOT-89-3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the STF715 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage Rating: Substitute parts must have a collector-emitter breakdown voltage (VCEO) equal to or greater than 80 V to ensure safe operation within the original design envelope.

Current Rating: Substitute parts must have a maximum collector current (Ic) equal to or greater than 1.5 A to support the original circuit current requirements.

Power Dissipation: Substitute parts must have a power rating equal to or greater than 1.4 W to handle thermal loads without exceeding junction temperature limits.

Package Compatibility: All substitute parts must use the TO-243AA package (SOT-89-3) to ensure mechanical and electrical compatibility with existing PCB layouts and solder reflow processes.

Transistor Type: All substitutes must be NPN configuration to maintain circuit polarity and biasing relationships.

Substitute parts are grouped into two categories based on these criteria:

Category A - Full Electrical Equivalents: Parts meeting or exceeding all electrical parameters (80 V, 1.5 A or higher, 1.4 W or higher power rating) in the SOT-89-3 package.

Category B - Reduced Current Equivalents: Parts meeting voltage and power requirements but with collector current ratings between 1.0 A and 1.5 A, suitable for applications where the full 1.5 A is not required.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	VCEO (Max) [V]	Ic (Max) [A]	Power (Max) [W]	Frequency [MHz]	Package	Product Status
STF715	STMicroelectronics	NPN	80	1.5	1.4	50	SOT-89-3	Obsolete
BC868,115	Nexperia USA Inc.	NPN	20	1.0	1.2	170	SOT-89	Active
BC868-25,115	Nexperia USA Inc.	NPN	20	2.0	0.5	170	SOT-89	Active
BCX56,115	Nexperia USA Inc.	NPN	80	1.0	1.25	180	SOT-89	Active
BCX56,135	NXP USA Inc.	NPN	80	1.0	1.25	180	SOT-89	Active
BCX56-10,115	Nexperia USA Inc.	NPN	80	1.0	1.25	180	SOT-89	Active
BCX56-10,135	Nexperia USA Inc.	NPN	80	1.0	1.25	180	SOT-89	Active
BCX5616QTA	Diodes Incorporated	NPN	80	1.0	2.0	150	SOT-89-3	Active
BCX5616TA	Diodes Incorporated	NPN	80	1.0	1.0	150	SOT-89-3	Active
BSR41,115	Nexperia USA Inc.	NPN	60	1.0	1.35	100	SOT-89	Active
BSR43,115	Nexperia USA Inc.	NPN	80	1.0	1.35	100	SOT-89	Active

Engineering Selection Recommendations

Primary Substitute - BCX5616QTA (Diodes Incorporated)

The BCX5616QTA is the most suitable direct substitute for the STF715. This part maintains the 80 V collector-emitter breakdown voltage and SOT-89-3 package configuration. While the maximum collector current is rated at 1.0 A (compared to 1.5 A for the STF715), the power dissipation rating of 2.0 W exceeds the original specification of 1.4 W. This part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The BCX5616QTA is suitable for applications where the circuit current requirement does not exceed 1.0 A.

Secondary Substitute - BCX5616TA (Diodes Incorporated)

The BCX5616TA provides equivalent voltage and package specifications to the STF715 with active product status. This part maintains 80 V VCEO and SOT-89-3 packaging. The maximum collector current is 1.0 A with a power rating of 1.0 W. This substitute is appropriate for lower-power applications within the 1.0 A current envelope.

Voltage-Compatible Substitutes - BCX56 Series (Nexperia USA Inc.)

The BCX56,115, BCX56,135, BCX56-10,115, and BCX56-10,135 variants all provide 80 V collector-emitter breakdown voltage matching the STF715 specification. These parts are available in active production status with ROHS3 compliance. All BCX56 variants are rated for 1.0 A maximum collector current and 1.25 W power dissipation. These substitutes are suitable for applications where circuit current does not exceed 1.0 A and are available in multiple packaging formats (Cut Tape, Digi-Reel, Tape & Reel).

Voltage-Reduced Substitutes - BSR41,115 and BSR43,115

The BSR43,115 maintains the 80 V voltage specification with 1.0 A current rating and 1.35 W power dissipation in active production status. The BSR41,115 provides a 60 V voltage rating, which is below the STF715 specification and is suitable only for applications with reduced voltage requirements. Both parts are ROHS3 compliant with unlimited moisture sensitivity rating.

Not Recommended - BC868 Series

The BC868,115 and BC868-25,115 variants provide only 20 V collector-emitter breakdown voltage, which is insufficient for applications requiring the 80 V rating of the STF715. These parts are not suitable substitutes for the original design.

Frequently Asked Questions (FAQ)

Q: Can the BCX5616QTA be used as a direct replacement for the STF715 in all applications?

A: The BCX5616QTA is suitable for applications where the circuit current requirement does not exceed 1.0 A. The STF715 is rated for 1.5 A maximum collector current. If the original design requires collector currents between 1.0 A and 1.5 A, the BCX5616QTA will not provide adequate current capacity. Circuit analysis is required to confirm current requirements before substitution.

Q: What is the difference between the BCX56 variants (BCX56,115, BCX56,135, BCX56-10,115, BCX56-10,135)?

A: All BCX56 variants share identical electrical specifications: 80 V VCEO, 1.0 A Ic (Max), and 1.25 W power rating. The differences are in packaging format and manufacturer designation. BCX56,115 and BCX56-10,115 are supplied by Nexperia USA Inc. in Cut Tape and Tape & Reel formats respectively. BCX56,135 and BCX56-10,135 are supplied by NXP USA Inc. in Bulk and Tape & Reel formats respectively. Selection depends on procurement and assembly requirements.

Q: Why is the BC868 series not recommended as a substitute?

A: The BC868 series is rated for a maximum collector-emitter breakdown voltage of 20 V, which is significantly below the STF715 specification of 80 V. Using this part in a circuit designed for 80 V operation would result in device failure due to voltage overstress. The BC868 series is suitable only for low-voltage applications.

Q: Are all substitute parts available in the same SOT-89-3 package as the STF715?

A: The BCX5616QTA and BCX5616TA are available in the SOT-89-3 package, matching the STF715 footprint exactly. The BCX56 series and BSR series are available in the SOT-89 package, which is mechanically compatible with SOT-89-3 but may have minor dimensional variations. Verification of PCB layout compatibility is recommended before production implementation.

Q: What compliance certifications apply to the substitute parts?

A: All recommended substitute parts are ROHS3 compliant and have unlimited moisture sensitivity level (MSL 1). All parts are classified as REACH Unaffected and carry EAR99 ECCN designation, matching the compliance profile of the original STF715.

Q: Can the BCX5616QTA handle the full 1.5 A current requirement of the STF715?

A: No. The BCX5616QTA is rated for a maximum collector current of 1.0 A. Operating this part at 1.5 A would exceed its absolute maximum rating and result in device damage. Circuit redesign or selection of an alternative part with higher current rating is required if 1.5 A operation is necessary.

Q: What is the significance of the transition frequency difference between the STF715 (50 MHz) and substitute parts (100-180 MHz)?

A: The transition frequency (fT) indicates the frequency at which the current gain of the transistor drops to unity. Substitute parts with higher transition frequencies (BCX56 at 180 MHz, BC868 at 170 MHz) provide better high-frequency performance than the original STF715 at 50 MHz. For low-frequency applications, this difference is not significant. For high-frequency switching or amplification circuits, the higher fT of substitute parts may provide improved performance characteristics.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message