STF826 Equivalent & Substitute Parts

Part Overview

The STF826 is a PNP bipolar junction transistor manufactured by STMicroelectronics, rated for 30 V collector-emitter breakdown voltage and 3 A maximum collector current. The device is packaged in SOT-89-3 surface mount configuration and operates at a maximum junction temperature of 150°C. The STF826 is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	3	A
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.1 V @ 150 mA, 3 A	—
Power - Max	1.4	W
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
Supplier Device Package	SOT-89-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the STF826 are selected based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: PNP (mandatory match)
Voltage - Collector Emitter Breakdown: minimum 30 V
Current - Collector (Ic) (Max): minimum 3 A
Mounting Type: Surface Mount
Package / Case: TO-243AA
Supplier Device Package: SOT-89-3 or SOT-89

Secondary Parameters Evaluated:

Vce Saturation characteristics
DC Current Gain (hFE)
Frequency - Transition
Operating Temperature range
Power dissipation capability
Product Status (Active preferred over Obsolete)

Substitute parts are grouped into two categories based on current rating alignment:

Group 1 - Full Current Rating Match (3 A): Parts meeting or exceeding the 3 A collector current specification with 30 V breakdown voltage.

Group 2 - Reduced Current Rating (1-2 A): Parts with lower maximum collector current ratings, suitable only for applications where the full 3 A capability is not required.

Parameter Comparison

Parameter	STF826	PBSS5330X,115	PBSS5330XZ	2DB1188Q-13	2DB1188R-13	2DB1132R-13	FCX589TA
Manufacturer	STMicroelectronics	Nexperia USA Inc.	Nexperia USA Inc.	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	3 A	3 A	3 A	2 A	2 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	32 V	32 V	32 V	30 V
Vce Saturation (Max) @ Ib, Ic	1.1 V @ 150 mA, 3 A	320 mV @ 300 mA, 3 A	240 mV @ 100 mA, 2 A	800 mV @ 200 mA, 2 A	800 mV @ 200 mA, 2 A	500 mV @ 50 mA, 500 mA	650 mV @ 200 mA, 2 A
DC Current Gain (hFE) (Min)	100 @ 100 mA, 2 V	175 @ 1 A, 2 V	175 @ 1 A, 2 V	120 @ 500 mA, 3 V	180 @ 500 mA, 3 V	180 @ 100 mA, 3 V	100 @ 500 mA, 2 V
Power - Max	1.4 W	1.6 W	550 mW	1 W	1 W	1 W	1 W
Frequency - Transition	100 MHz	100 MHz	100 MHz	120 MHz	120 MHz	190 MHz	100 MHz
Operating Temperature (TJ)	150°C	150°C	150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89-3	SOT-89	SOT-89	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	3857 Pcs	1781 Pcs	2012 Pcs	10570 Pcs	12600 Pcs	22700 Pcs	34400 Pcs

Engineering Selection Recommendations

Direct Substitutes (Full Electrical Compatibility):

The PBSS5330X,115 and PBSS5330XZ from Nexperia USA Inc. are direct substitutes for the STF826. Both devices match the critical electrical parameters: 3 A maximum collector current, 30 V collector-emitter breakdown voltage, 100 MHz transition frequency, and TO-243AA package in SOT-89 configuration. Both parts are Active status and ROHS3 compliant. The PBSS5330X,115 provides 1.6 W power dissipation and includes AEC-Q100 automotive qualification. The PBSS5330XZ offers 550 mW power dissipation with AEC-Q100 qualification. Selection between these two depends on thermal design requirements.

Partial Substitutes (Reduced Current Rating):

The 2DB1188Q-13 and 2DB1188R-13 from Diodes Incorporated provide 2 A maximum collector current with 32 V breakdown voltage. These parts are suitable for applications where the full 3 A capability is not required. Both are Active status with extended operating temperature range (-55°C to 150°C) and ROHS3 compliance. The 2DB1188R-13 offers higher DC current gain (180 vs. 120 minimum).

The 2DB1132R-13 from Diodes Incorporated provides 1 A maximum collector current with 32 V breakdown voltage and 190 MHz transition frequency. This part is suitable only for low-current applications and is not recommended for designs requiring the full 3 A specification.

The FCX589TA from Diodes Incorporated provides 1 A maximum collector current with 30 V breakdown voltage matching the original specification. This part offers extended operating temperature range (-65°C to 150°C) and is Active status with ROHS3 compliance.

Recommendation Priority:

For direct replacement in existing designs: PBSS5330X,115 or PBSS5330XZ (Nexperia).

For applications with reduced current requirements: 2DB1188Q-13 or 2DB1188R-13 (Diodes Incorporated).

All substitute parts are Active status, eliminating obsolescence risk associated with the original STF826.

Frequently Asked Questions (FAQ)

Q: Can the PBSS5330X,115 directly replace the STF826 in all applications?

A: Yes. The PBSS5330X,115 matches all critical electrical parameters: 3 A collector current, 30 V breakdown voltage, 100 MHz transition frequency, and identical TO-243AA package in SOT-89 configuration. Both are ROHS3 compliant. The primary difference is improved Vce saturation (320 mV vs. 1.1 V), which reduces power dissipation and improves switching performance.

Q: What is the difference between PBSS5330X,115 and PBSS5330XZ?

A: Both parts are electrically equivalent with 3 A current rating and 30 V breakdown voltage. The PBSS5330X,115 is rated for 1.6 W maximum power dissipation, while the PBSS5330XZ is rated for 550 mW. The PBSS5330XZ exhibits lower Vce saturation (240 mV vs. 320 mV), indicating superior switching characteristics. Selection depends on thermal design and power dissipation requirements of the application.

Q: Can I use the 2DB1188Q-13 as a substitute if my application only requires 2 A?

A: Yes. The 2DB1188Q-13 is rated for 2 A maximum collector current with 32 V breakdown voltage, exceeding the 2 A requirement. The device is Active status with extended operating temperature range (-55°C to 150°C) and ROHS3 compliance. Verify that the reduced power dissipation (1 W vs. 1.4 W) is acceptable for your thermal design.

Q: Are there package compatibility concerns between SOT-89-3 and SOT-89?

A: The SOT-89-3 and SOT-89 packages are mechanically compatible in TO-243AA case outline. Both are three-lead surface mount packages with identical pin spacing and footprint. PCB layout and assembly processes require no modification.

Q: Why is the FCX589TA rated for only 1 A when the STF826 is rated for 3 A?

A: The FCX589TA is a different device variant designed for lower current applications. While it matches the 30 V breakdown voltage and 100 MHz transition frequency, the 1 A current rating limits its use to applications not requiring the full 3 A capability. This part is not recommended as a direct replacement for the STF826 in designs requiring 3 A operation.

Q: What is the significance of AEC-Q100 qualification on the Nexperia parts?

A: AEC-Q100 qualification indicates the parts meet automotive industry reliability and quality standards. This certification is relevant only if your application requires automotive-grade components. For non-automotive applications, this qualification provides no functional benefit but confirms rigorous testing and quality control.

Q: How do I determine which substitute is best for my design?

A: Evaluate your application requirements against these criteria: (1) Required maximum collector current (3 A, 2 A, or 1 A); (2) Operating temperature range; (3) Power dissipation budget; (4) Switching speed requirements. The PBSS5330X,115 or PBSS5330XZ are recommended for full 3 A applications. The 2DB1188 series is suitable for 2 A applications. Lower-current parts are not recommended for 3 A designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the environmental compliance status of the original STF826. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

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