BFS17TA Equivalent & Substitute Parts

Part Overview

The BFS17TA is an RF transistor NPN manufactured by Diodes Incorporated, designed for RF applications operating at 1.3GHz with a maximum collector-emitter breakdown voltage of 15V and power dissipation of 330mW. The device is packaged in SOT-23-3 surface mount configuration and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	15V	V
Frequency - Transition	1.3GHz	GHz
Power - Max	330mW	mW
Current - Collector (Ic) (Max)	25mA	mA
DC Current Gain (hFE) (Min) @ Ic, Vce	20 @ 25mA, 1V	—
Noise Figure (dB Typ @ f)	4.5dB @ 500MHz	dB
Operating Temperature	-55°C ~ 150°C (TJ)	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the BFS17TA is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): 15V or greater
Frequency - Transition: 1.3GHz or greater
Power - Max: 330mW or greater
Current - Collector (Ic) (Max): 25mA or greater
Package / Case: SOT-23-3 compatible or equivalent surface mount package
Mounting Type: Surface Mount

Substitution Logic: Substitute parts are grouped into two categories based on their electrical and mechanical compatibility with the BFS17TA:

Category 1 - Direct Package Compatibility (SOT-23-3): Parts maintaining the same SOT-23-3 package footprint with matching or superior electrical specifications. These parts provide pin-for-pin compatibility and require no PCB layout modifications.

Category 2 - Functional Equivalence (Alternative Packages): Parts with superior electrical performance and different surface mount packages. These parts meet or exceed all critical electrical parameters but require PCB layout evaluation due to package differences.

Parameter Comparison

Part Number	Manufacturer	Voltage - Collector Emitter Breakdown (Max)	Frequency - Transition	Power - Max	Current - Collector (Ic) (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Noise Figure (dB Typ @ f)	Operating Temperature	Package / Case	Product Status	RoHS Status
BFS17TA	Diodes Incorporated	15V	1.3GHz	330mW	25mA	20 @ 25mA, 1V	4.5dB @ 500MHz	-55°C ~ 150°C	TO-236-3, SC-59, SOT-23-3	Obsolete	RoHS non-compliant
BFR35APE6327HTSA1	Infineon Technologies	15V	5GHz	280mW	45mA	70 @ 15mA, 8V	1.4dB ~ 2dB @ 900MHz ~ 1.8GHz	150°C	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BFR92PE6327HTSA1	Infineon Technologies	15V	5GHz	280mW	45mA	70 @ 15mA, 8V	1.4dB ~ 2dB @ 900MHz ~ 1.8GHz	150°C	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
MMBT918LT1G	onsemi	15V	600MHz	225mW	50mA	20 @ 3mA, 1V	6dB @ 60MHz	-55°C ~ 150°C	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BFP181E7764HTSA1	Infineon Technologies	12V	8GHz	175mW	20mA	70 @ 70mA, 8V	0.9dB ~ 1.2dB @ 900MHz ~ 1.8GHz	150°C	TO-253-4, TO-253AA	Active	ROHS3 Compliant
BFP420H6801XTSA1	Infineon Technologies	5V	25GHz	160mW	35mA	60 @ 20mA, 4V	1.1dB @ 1.8GHz	150°C	SC-82A, SOT-343	Active	ROHS3 Compliant
BF888H6327XTSA1	Infineon Technologies	4V	47GHz	160mW	30mA	250 @ 25A, 3V	0.5dB ~ 0.85dB @ 1.8GHz ~ 6GHz	150°C	SC-82A, SOT-343	Active	ROHS3 Compliant
MAX2601ESA+	Analog Devices Inc./Maxim Integrated	15V	1GHz	6.4W	1.2A	100 @ 250mA, 3V	3.3dB @ 836MHz	150°C	8-SOIC (0.154", 3.90mm Width) Exposed Pad	Active	ROHS3 Compliant

Engineering Selection Recommendations

Category 1 - Direct Package Compatibility (SOT-23-3):

BFR92PE6327HTSA1 and BFR35APE6327HTSA1 are the primary substitutes for the BFS17TA. Both parts maintain identical package geometry (SOT-23-3), matching collector-emitter breakdown voltage (15V), and superior frequency performance (5GHz versus 1.3GHz). Both parts are ROHS3 compliant and carry active product status. BFR92PE6327HTSA1 offers significantly higher inventory availability (305,200 units) compared to BFR35APE6327HTSA1 (3,706 units). These parts are suitable for direct replacement in existing PCB designs without layout modifications.

MMBT918LT1G provides SOT-23-3 package compatibility with matching collector-emitter breakdown voltage (15V) and operating temperature range (-55°C ~ 150°C). However, this part operates at 600MHz, below the BFS17TA specification of 1.3GHz. MMBT918LT1G is ROHS3 compliant and carries active product status. This part is suitable only for applications where the lower frequency specification is acceptable.

Category 2 - Functional Equivalence (Alternative Packages):

BFP181E7764HTSA1 provides superior frequency performance (8GHz) and improved noise figure characteristics (0.9dB ~ 1.2dB) but operates at reduced collector-emitter breakdown voltage (12V) and requires a different package footprint (TO-253-4, TO-253AA). This part is ROHS3 compliant and carries active product status. Selection requires PCB layout evaluation.

BFP420H6801XTSA1 operates at 25GHz with improved noise figure (1.1dB) but features reduced collector-emitter breakdown voltage (5V) and different package footprint (SOT-343). This part is ROHS3 compliant and carries active product status. Selection requires PCB layout evaluation and voltage specification verification.

BF888H6327XTSA1 provides the highest frequency performance (47GHz) but operates at significantly reduced collector-emitter breakdown voltage (4V) and requires different package footprint (SOT-343). This part is ROHS3 compliant and carries active product status. Selection requires PCB layout evaluation and voltage specification verification.

MAX2601ESA+ offers significantly higher power dissipation capability (6.4W) and collector current (1.2A) with matching collector-emitter breakdown voltage (15V) and ROHS3 compliance. However, this part operates at 1GHz (below BFS17TA specification) and requires 8-SOIC package footprint. Selection requires PCB layout evaluation.

Frequently Asked Questions (FAQ)

Q: Can BFR92PE6327HTSA1 or BFR35APE6327HTSA1 be used as direct replacements for BFS17TA?

A: Yes. Both parts maintain identical SOT-23-3 package geometry, matching 15V collector-emitter breakdown voltage, and superior frequency performance (5GHz versus 1.3GHz). No PCB layout modifications are required. Both parts are ROHS3 compliant with active product status.

Q: What is the primary difference between BFR92PE6327HTSA1 and BFR35APE6327HTSA1?

A: Both parts are electrically identical with matching specifications. The primary difference is inventory availability: BFR92PE6327HTSA1 has 305,200 units in stock versus 3,706 units for BFR35APE6327HTSA1. Both are packaged in SOT-23-3 and are ROHS3 compliant.

Q: Why does MMBT918LT1G have lower frequency performance than BFS17TA?

A: MMBT918LT1G is specified for 600MHz transition frequency, which is below the BFS17TA specification of 1.3GHz. This part is suitable only for applications where the lower frequency specification meets design requirements. The part maintains SOT-23-3 package compatibility and 15V collector-emitter breakdown voltage.

Q: Can BFP181E7764HTSA1, BFP420H6801XTSA1, or BF888H6327XTSA1 be used as substitutes?

A: These parts provide functional equivalence with superior frequency performance but require PCB layout evaluation due to different package footprints. BFP181E7764HTSA1 operates at 12V (below BFS17TA 15V specification). BFP420H6801XTSA1 and BF888H6327XTSA1 operate at 5V and 4V respectively (below BFS17TA 15V specification). Selection depends on specific application voltage requirements.

Q: Is MAX2601ESA+ suitable as a substitute for BFS17TA?

A: MAX2601ESA+ provides matching 15V collector-emitter breakdown voltage and ROHS3 compliance but operates at 1GHz (below BFS17TA 1.3GHz specification) and requires 8-SOIC package footprint. This part offers significantly higher power dissipation (6.4W) and collector current (1.2A). Selection requires PCB layout evaluation and frequency specification verification.

Q: What is the impact of package differences when selecting substitute parts?

A: Package differences require PCB layout evaluation and potential redesign. SOT-23-3 compatible parts (BFR92PE6327HTSA1, BFR35APE6327HTSA1, MMBT918LT1G) provide direct footprint compatibility. Alternative packages (SOT-343, TO-253-4, 8-SOIC) require layout modifications and may affect thermal management and signal routing.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original BFS17TA is RoHS non-compliant. Substitution with ROHS3 compliant parts ensures compliance with current environmental regulations.

Q: What is the significance of the BFS17TA obsolete status?

A: Obsolete status indicates the part is no longer manufactured or supported by Diodes Incorporated. Substitution is necessary for ongoing design support, production continuity, and system maintenance. Active status substitute parts ensure long-term availability and manufacturer support.

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