STF724 Equivalent & Substitute Parts

Part Overview

The STF724 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 30V collector-emitter breakdown voltage and 3A maximum collector current. Designed for surface mount applications in the SOT-89-3 package, this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	3	A
Voltage - Collector Emitter Breakdown (Max)	30	V
Power - Max	1.4	W
Frequency - Transition	100	MHz
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100mA, 2V	—

Substitute Part Grouping Explanation

Substitution of the STF724 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Maximum Collector Current (Ic): 3A minimum
Maximum Collector-Emitter Breakdown Voltage (Vce): 30V minimum
Package / Case: TO-243AA (SOT-89 variants)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Power dissipation capability: 1.4W or greater
Transition frequency: 100MHz or greater
DC current gain (hFE): 100 or greater at specified conditions
RoHS3 compliance and REACH unaffected status

The substitute parts listed below meet or exceed these parameters and are available from active manufacturers with confirmed inventory.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) A	Vce Breakdown (Max) V	Power (Max) W	Frequency (Transition) MHz	hFE (Min)	Package	Product Status
STF724	STMicroelectronics	3	30	1.4	100	100	SOT-89-3	Obsolete
PBSS4330X,115	Nexperia USA Inc.	3	30	1.6	100	270	SOT-89	Active
PBSS4330X,135	Nexperia USA Inc.	3	30	1.6	100	270	SOT-89	Active
2SCR552PT100	Rohm Semiconductor	3	30	2	280	200	MPT3	Active
BD882-O-TP	Micro Commercial Co	3	30	0.5	50	60	SOT-89	Active
BD882-R-TP	Micro Commercial Co	3	30	0.5	50	60	SOT-89	Active
BD882-Y-TP	Micro Commercial Co	3	30	0.5	50	60	SOT-89	Active
BD882-GR-TP	Micro Commercial Co	3	30	0.5	50	60	SOT-89	Last Time Buy

Engineering Selection Recommendations

Recommended Primary Substitutes:

The PBSS4330X,115 and PBSS4330X,135 from Nexperia USA Inc. are the preferred direct substitutes for the STF724. Both parts maintain identical electrical specifications for collector current, breakdown voltage, and transition frequency. These devices feature higher DC current gain (270 vs. 100), improved power dissipation (1.6W vs. 1.4W), and are qualified to AEC-Q100 automotive standards. Both are in active production with substantial inventory availability and full RoHS3 compliance.

Secondary Substitutes:

The 2SCR552PT100 from Rohm Semiconductor exceeds STF724 specifications across all critical parameters, including superior transition frequency (280MHz vs. 100MHz) and power rating (2W vs. 1.4W). This part is suitable for applications requiring enhanced performance margins.

Limited Substitutes:

The BD882 series variants (BD882-O-TP, BD882-R-TP, BD882-Y-TP, BD882-GR-TP) from Micro Commercial Co meet the core electrical requirements but operate at reduced power dissipation (500mW vs. 1.4W) and lower transition frequency (50MHz vs. 100MHz). These parts are suitable only for applications where power and frequency requirements do not approach the STF724 maximum ratings. BD882-GR-TP is designated Last Time Buy and should not be selected for new designs.

Compliance Status:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status consistent with the original STF724.

Frequently Asked Questions (FAQ)

Q: Can the PBSS4330X series directly replace the STF724 in existing designs?

A: Yes. The PBSS4330X,115 and PBSS4330X,135 are direct electrical equivalents with identical maximum ratings for collector current (3A), breakdown voltage (30V), and transition frequency (100MHz). Both use the SOT-89 package compatible with SOT-89-3 footprints. The higher DC current gain (270 vs. 100) and improved power rating (1.6W vs. 1.4W) provide additional design margin.

Q: What is the difference between PBSS4330X,115 and PBSS4330X,135?

A: Both parts are electrically identical with the same maximum ratings and performance characteristics. The suffix designations (115 and 135) indicate different packaging or qualification batches from Nexperia. Selection between these variants depends on supplier availability and internal part numbering requirements.

Q: Are the BD882 variants suitable replacements for high-frequency applications?

A: The BD882 series operates at 50MHz transition frequency, which is half the STF724 specification of 100MHz. These parts are suitable only for applications operating below 50MHz. For designs requiring 100MHz or higher frequency performance, the PBSS4330X or 2SCR552PT100 are required.

Q: What is the power dissipation difference between substitute options?

A: The STF724 is rated for 1.4W maximum power dissipation. The PBSS4330X series provides 1.6W, the 2SCR552PT100 provides 2W, and the BD882 series provides only 500mW. Applications requiring sustained power dissipation near or exceeding 1.4W must use PBSS4330X or 2SCR552PT100. The BD882 series is limited to lower power applications.

Q: Is the 2SCR552PT100 from Rohm Semiconductor a suitable substitute?

A: Yes. The 2SCR552PT100 exceeds all STF724 specifications with superior transition frequency (280MHz vs. 100MHz), higher power rating (2W vs. 1.4W), and improved DC current gain (200 vs. 100). This part is suitable for direct substitution and provides enhanced performance margins for demanding applications.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use TO-243AA case variants (SOT-89 or MPT3 designations). These packages are mechanically compatible with SOT-89-3 footprints. Verify PCB layout and solder pad dimensions with component datasheets before production implementation.

Q: Are there automotive-qualified alternatives available?

A: Yes. The PBSS4330X,115 and PBSS4330X,135 are qualified to AEC-Q100 automotive standards, making them suitable for automotive and harsh environment applications requiring enhanced reliability qualification.

Q: Why should BD882-GR-TP be avoided for new designs?

A: The BD882-GR-TP is designated Last Time Buy, indicating the manufacturer has announced end-of-life production. This part should not be selected for new product designs due to limited future availability and potential supply discontinuation.

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