BFS19,235 Equivalent & Substitute Parts

Part Overview

The BFS19,235 is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in the TO-236AB package. This component operates at a maximum collector current of 30 mA, collector-emitter breakdown voltage of 20 V, and maximum power dissipation of 250 mW. The device is qualified to AEC-Q101 automotive standards and maintains active product status with 924 pieces currently in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or inventory levels are required, or when application requirements permit operation with enhanced electrical specifications. The BFS19,235 has documented substitute options that maintain compatibility within defined electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	30	mA
Collector-Emitter Breakdown Voltage (Max)	20	V
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min)	65	@ 1mA, 10V
Power Dissipation (Max)	250	mW
Transition Frequency	260	MHz
Operating Temperature (Max)	150	°C
Package Type	TO-236-3 / SOT-23-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BFS19,235 are classified into two categories based on electrical parameter alignment:

Parametric Equivalent (Direct Substitution): The BFS19,215 maintains identical electrical specifications across all critical parameters: 30 mA maximum collector current, 20 V collector-emitter breakdown voltage, 250 mW power dissipation, 260 MHz transition frequency, and 65 minimum DC current gain. This part is manufactured by the same supplier (Nexperia USA Inc.) and carries identical automotive qualification (AEC-Q101). The BFS19,215 differs only in packaging format (Tape & Reel) and inventory availability (6315 pieces).

Similar Substitutes (Application-Dependent): The FMMT618TA, NSS20201LT1G, and SMBT3904E6327HTSA1 are classified as similar substitutes because they share the same package type (TO-236-3 / SOT-23-3) and collector-emitter breakdown voltage (20 V) but exceed the BFS19,235 specifications in collector current capacity and power dissipation. These parts are suitable for applications where the BFS19,235 current and power ratings are insufficient, provided the circuit design accommodates the higher specifications.

Key Parameters Determining Substitution:

Collector-Emitter Breakdown Voltage: 20 V (fixed requirement)
Package Type: TO-236-3 / SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Transistor Type: NPN (functional requirement)

Parameter Comparison

Parameter	BFS19,235	BFS19,215	FMMT618TA	NSS20201LT1G	SMBT3904E6327HTSA1
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Diodes Incorporated	onsemi	Infineon Technologies
Transistor Type	NPN	NPN	NPN	NPN	NPN
Ic (Max)	30 mA	30 mA	2.5 A	2 A	200 mA
Vce Breakdown (Max)	20 V	20 V	20 V	20 V	40 V
Power (Max)	250 mW	250 mW	625 mW	460 mW	330 mW
Frequency - Transition	260 MHz	260 MHz	140 MHz	150 MHz	300 MHz
hFE (Min)	65 @ 1mA, 10V	65 @ 1mA, 10V	200 @ 2A, 2V	200 @ 500mA, 2V	100 @ 10mA, 1V
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C
Package / Case	TO-236-3 / SOT-23-3	TO-236-3 / SOT-23-3	TO-236-3 / SOT-23-3	TO-236-3 / SOT-23-3	TO-236-3 / SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	—	—	—
Qualification	AEC-Q101	AEC-Q101	—	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	924	6315	54762	18180	253664

Engineering Selection Recommendations

BFS19,215 Selection: This part is the primary substitute for the BFS19,235. Both components are manufactured by Nexperia USA Inc. and carry identical electrical specifications, automotive grade designation, and AEC-Q101 qualification. The BFS19,215 is suitable for direct replacement in all applications where the BFS19,235 is specified. The higher inventory level (6315 pieces) provides improved availability. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

FMMT618TA Selection: This Diodes Incorporated part is suitable for applications where collector current requirements exceed 30 mA but do not exceed 2.5 A. The 20 V collector-emitter breakdown voltage matches the BFS19,235 requirement. The higher power dissipation rating (625 mW) and increased current capacity accommodate higher-power switching applications. The transition frequency of 140 MHz is lower than the BFS19,235. This part does not carry automotive grade or AEC-Q101 qualification. Selection requires verification that automotive qualification is not a circuit requirement.

NSS20201LT1G Selection: This onsemi part accommodates collector currents up to 2 A with 20 V collector-emitter breakdown voltage. Power dissipation capability (460 mW) exceeds the BFS19,235. The transition frequency of 150 MHz is lower than the BFS19,235. This part does not carry automotive grade or AEC-Q101 qualification. Selection requires verification that automotive qualification is not a circuit requirement.

SMBT3904E6327HTSA1 Selection: This Infineon Technologies part provides 40 V collector-emitter breakdown voltage, exceeding the BFS19,235 specification. Maximum collector current is 200 mA. The transition frequency of 300 MHz exceeds the BFS19,235. This part carries Last Time Buy product status and does not hold automotive grade or AEC-Q101 qualification. Selection is limited to applications where higher voltage rating is beneficial and automotive qualification is not required.

Frequently Asked Questions (FAQ)

Q: Can the BFS19,215 be used as a direct replacement for the BFS19,235?

A: Yes. The BFS19,215 is a parametric equivalent with identical electrical specifications, including 30 mA maximum collector current, 20 V collector-emitter breakdown voltage, 250 mW power dissipation, 260 MHz transition frequency, and 65 minimum DC current gain. Both parts are manufactured by Nexperia USA Inc., carry AEC-Q101 automotive qualification, and are ROHS3 compliant. The parts differ only in packaging format and inventory availability.

Q: What is the primary difference between the BFS19,235 and the FMMT618TA?

A: The FMMT618TA is manufactured by Diodes Incorporated and provides significantly higher collector current capacity (2.5 A versus 30 mA) and power dissipation (625 mW versus 250 mW). Both parts share the same 20 V collector-emitter breakdown voltage and TO-236-3 / SOT-23-3 package. The FMMT618TA does not carry automotive grade or AEC-Q101 qualification. Selection depends on whether the application requires higher current capacity and whether automotive qualification is mandatory.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts listed (BFS19,215, FMMT618TA, NSS20201LT1G, and SMBT3904E6327HTSA1) use the TO-236-3 / SOT-23-3 package with identical pin configuration and footprint. Surface mount assembly equipment and PCB layouts designed for the BFS19,235 accommodate all listed substitutes without modification.

Q: Which substitute part should be selected for automotive applications?

A: The BFS19,215 is the only substitute that maintains automotive grade designation and AEC-Q101 qualification identical to the BFS19,235. For automotive applications where these qualifications are required, the BFS19,215 is the appropriate selection. The FMMT618TA, NSS20201LT1G, and SMBT3904E6327HTSA1 do not carry automotive qualification and are not suitable for applications with automotive grade requirements.

Q: Can the SMBT3904E6327HTSA1 be used in place of the BFS19,235?

A: The SMBT3904E6327HTSA1 shares the same package type and 20 V collector-emitter breakdown voltage but provides higher voltage rating (40 V) and higher transition frequency (300 MHz). However, this part carries Last Time Buy product status and does not hold automotive grade or AEC-Q101 qualification. Selection is limited to non-automotive applications where higher voltage rating is beneficial and long-term availability is not a concern.

Q: What is the significance of the collector-emitter breakdown voltage in substitution decisions?

A: The collector-emitter breakdown voltage (Vce) defines the maximum voltage the transistor can withstand between collector and emitter terminals. The BFS19,235 specifies 20 V maximum. Substitute parts must meet or exceed this specification to ensure safe operation in the circuit. The FMMT618TA and NSS20201LT1G both specify 20 V, providing equivalent protection. The SMBT3904E6327HTSA1 specifies 40 V, providing additional voltage margin but not required for circuits designed for 20 V operation.

Q: How does transition frequency affect part selection?

A: Transition frequency (fT) indicates the frequency at which the transistor's current gain drops to unity. The BFS19,235 specifies 260 MHz. Substitute parts with lower transition frequencies (FMMT618TA at 140 MHz, NSS20201LT1G at 150 MHz) are suitable for applications operating below their specified frequencies. The SMBT3904E6327HTSA1 at 300 MHz provides higher frequency capability. Selection depends on the circuit's operating frequency requirements.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is an automotive electronics qualification standard that certifies components for reliability and performance in automotive applications. The BFS19,235 and BFS19,215 both carry this qualification, indicating they meet automotive industry reliability requirements. Substitute parts without this qualification (FMMT618TA, NSS20201LT1G, SMBT3904E6327HTSA1) are not certified for automotive use and should not be selected for applications requiring automotive qualification.

Q: Is inventory availability a factor in part selection?

A: Inventory availability is a practical consideration for procurement and supply chain planning. The BFS19,235 has 924 pieces in stock, while the BFS19,215 has 6315 pieces. The similar substitutes have significantly higher inventory levels (FMMT618TA: 54762 pieces, NSS20201LT1G: 18180 pieces, SMBT3904E6327HTSA1: 253664 pieces). Higher inventory levels reduce lead time risk but do not affect electrical compatibility or performance characteristics.

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