BFS20,235 Equivalent & Substitute Parts

Part Overview

The BFS20,235 is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in the TO-236AB package. This device operates at a maximum collector voltage of 20 V with a maximum collector current of 25 mA and a transition frequency of 450 MHz, making it suitable for high-frequency switching and amplification circuits. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. With 1873 pieces currently in stock and active product status, the BFS20,235 remains available for new designs. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, or address specific application requirements where alternative electrical or mechanical characteristics are acceptable.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	20	V
Current - Collector (Ic) (Max)	25	mA
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 7mA, 10V	—
Power - Max	250	mW
Frequency - Transition	450	MHz
Operating Temperature (TJ)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BFS20,235 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent: Parts that match all critical electrical specifications and package requirements, enabling direct substitution without circuit modification.

Similar Parts: Parts that share the same package form factor and general transistor topology but differ in one or more electrical parameters. These parts require circuit evaluation to confirm suitability for the intended application.

The substitution logic is based on the following key parameters:

Transistor Type (NPN topology)
Package / Case (TO-236-3, SC-59, SOT-23-3 surface mount form factor)
Voltage - Collector Emitter Breakdown (minimum acceptable rating)
Current - Collector (Ic) (maximum current handling capability)
Power - Max (thermal dissipation capability)
Frequency - Transition (high-frequency performance)
Compliance certifications (RoHS3, AEC-Q101 automotive grade)

Parameter Comparison

Parameter	BFS20,235	BFS20,215	MMBT5089LT1G	SMBT3904E6327HTSA1
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	Infineon Technologies
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	20 V	20 V	25 V	40 V
Current - Collector (Ic) (Max)	25 mA	25 mA	50 mA	200 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	50 nA	50 nA
DC Current Gain (hFE) (Min)	40 @ 7mA, 10V	40 @ 7mA, 10V	400 @ 100µA, 5V	100 @ 10mA, 1V
Power - Max	250 mW	250 mW	300 mW	330 mW
Frequency - Transition	450 MHz	450 MHz	50 MHz	300 MHz
Operating Temperature (TJ)	150°C	150°C	-55°C ~ 150°C	150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Last Time Buy

Engineering Selection Recommendations

BFS20,215 (Parametric Equivalent): This part is a direct parametric equivalent to the BFS20,235, manufactured by Nexperia USA Inc. Both devices share identical electrical specifications, including 20 V collector-emitter breakdown voltage, 25 mA maximum collector current, 450 MHz transition frequency, and 250 mW power dissipation. Both carry automotive-grade qualification (AEC-Q101) and RoHS3 compliance. The BFS20,215 is available in higher inventory (6100 pieces) and is suitable for direct substitution in all applications where the BFS20,235 is specified. No circuit modification is required.

MMBT5089LT1G (Similar Part - Lower Frequency): This onsemi device shares the same TO-236-3 surface mount package and NPN topology. It provides higher voltage rating (25 V) and higher current capability (50 mA) compared to the BFS20,235, with increased power dissipation (300 mW). However, the transition frequency is significantly lower at 50 MHz versus 450 MHz. This part is suitable for applications where high-frequency performance is not critical and where the higher current and voltage ratings provide design margin. The extended operating temperature range (-55°C to 150°C) offers additional thermal flexibility. Product status is active with substantial inventory availability (35400 pieces).

SMBT3904E6327HTSA1 (Similar Part - Higher Performance): This Infineon device offers the highest electrical ratings among the substitutes, with 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, and 330 mW power dissipation. The transition frequency of 300 MHz is lower than the BFS20,235 but higher than the MMBT5089LT1G. This part is suitable for applications requiring higher current handling or voltage margin. However, the product status is listed as Last Time Buy, indicating limited future availability. Use of this part should be restricted to applications where the enhanced specifications provide necessary design benefits and where long-term supply is not a concern.

All substitute parts maintain RoHS3 compliance and surface mount packaging compatibility with the original BFS20,235.

Frequently Asked Questions (FAQ)

Q: Can BFS20,215 be used as a direct replacement for BFS20,235?

A: Yes. The BFS20,215 is a parametric equivalent with identical electrical specifications, package form factor, and compliance certifications. Direct substitution is possible without circuit modification.

Q: What is the primary difference between BFS20,235 and MMBT5089LT1G?

A: The MMBT5089LT1G has lower transition frequency (50 MHz versus 450 MHz) but higher current capability (50 mA versus 25 mA) and voltage rating (25 V versus 20 V). Selection depends on whether high-frequency performance or higher current capacity is required for the application.

Q: Is SMBT3904E6327HTSA1 suitable for long-term production use?

A: The SMBT3904E6327HTSA1 carries a Last Time Buy product status, indicating that the manufacturer has announced end-of-life. While currently available in high inventory (253664 pieces), this part should not be selected for new designs requiring long-term supply continuity. Use only if the enhanced electrical specifications (40 V, 200 mA, 330 mW) are essential and supply requirements are limited.

Q: Do all substitute parts have the same package dimensions?

A: All substitute parts use the TO-236-3, SC-59, or SOT-23-3 surface mount package designation. These are mechanically and electrically compatible package forms suitable for the same PCB footprint.

Q: Are all substitute parts automotive-grade qualified?

A: The BFS20,235 and BFS20,215 both carry AEC-Q101 automotive qualification. The MMBT5089LT1G and SMBT3904E6327HTSA1 do not list AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 compliance, use only BFS20,235 or BFS20,215.

Q: What is the significance of the DC Current Gain (hFE) differences among these parts?

A: DC Current Gain varies by measurement conditions. The BFS20,235 and BFS20,215 specify hFE of 40 at 7 mA collector current and 10 V Vce. The MMBT5089LT1G specifies hFE of 400 at 100 µA and 5 V, while SMBT3904E6327HTSA1 specifies hFE of 100 at 10 mA and 1 V. These differences reflect different transistor designs and measurement points. Circuit design must account for the specific hFE characteristics of the selected part.

Q: Can these parts be used interchangeably in high-frequency circuits operating near 450 MHz?

A: No. The BFS20,235 and BFS20,215 are specified for 450 MHz transition frequency, making them suitable for high-frequency applications. The MMBT5089LT1G (50 MHz) and SMBT3904E6327HTSA1 (300 MHz) have lower transition frequencies and may not perform adequately in circuits requiring 450 MHz operation. Part selection must match the frequency requirements of the specific application.

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