BCX18,215 Equivalent & Substitute Parts

Part Overview

The BCX18,215 is an active production PNP bipolar junction transistor manufactured by Nexperia USA Inc., rated for 25 V collector-emitter breakdown voltage and 500 mA maximum collector current. The device is packaged in TO-236AB (SOT-23-3) surface mount configuration and qualified to AEC-Q101 automotive standards. This transistor is suitable for general-purpose switching and amplification applications in automotive and industrial electronics requiring low-power PNP functionality.

Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications of the BCX18,215, enabling direct replacement or functional substitution in circuit designs where parameter compatibility is maintained.

Key Parameters

Parameter	BCX18,215 Specification
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	25 V
Current - Collector (Ic) (Max)	500 mA
Power - Max	250 mW
Frequency - Transition	80 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V
Vce Saturation (Max) @ Ib, Ic	620mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the BCX18,215 are classified into two categories based on parametric alignment:

Parametric Equivalent: Parts that match all critical electrical specifications (voltage rating, current rating, power dissipation, gain, and saturation characteristics) and maintain identical package and mounting specifications.

Similar Functional Equivalents: Parts that satisfy the primary electrical requirements (PNP type, 25 V voltage rating, 500 mA or higher current capability, surface mount packaging) but may differ in secondary parameters such as transition frequency, power dissipation, saturation voltage, or current gain. These parts are suitable for substitution when circuit design margins accommodate the parameter variations.

Critical Parameters for Substitution:

Transistor Type: PNP (mandatory)
Voltage - Collector Emitter Breakdown: ≥ 25 V (minimum requirement)
Current - Collector (Max): ≥ 500 mA (minimum requirement)
Package / Case: TO-236-3, SC-59, or SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
RoHS Status: ROHS3 Compliant (regulatory compliance)

Parameter Comparison

Parameter	BCX18,215	BCX18,235	2SA1298-Y,LF	BC808-25LT1G	BCX17LT1G	FSB749	KSA1298YMTF
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Toshiba Semiconductor and Storage	onsemi	onsemi	onsemi	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	25 V	25 V	25 V	25 V	45 V	25 V	25 V
Current - Collector (Ic) (Max)	500 mA	500 mA	800 mA	500 mA	500 mA	3 A	800 mA
Power - Max	250 mW	250 mW	200 mW	300 mW	300 mW	500 mW	200 mW
Frequency - Transition	80 MHz	80 MHz	120 MHz	100 MHz	—	100 MHz	120 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V	100 @ 100mA, 1V	160 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 100mA, 1V	100 @ 1A, 2V	160 @ 100mA, 1V
Vce Saturation (Max) @ Ib, Ic	620mV @ 50mA, 500mA	620mV @ 50mA, 500mA	400mV @ 20mA, 500mA	700mV @ 50mA, 500mA	620mV @ 50mA, 500mA	600mV @ 300mA, 3A	400mV @ 20mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)
Operating Temperature (TJ)	150°C	150°C	150°C	-55°C ~ 150°C	-55°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	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	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	Automotive	Automotive	—	—	—	—	—
Qualification	AEC-Q101	AEC-Q101	—	—	—	—	—

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

BCX18,235 (Nexperia USA Inc.) is a parametric equivalent to BCX18,215. Both parts share identical electrical specifications, automotive grade qualification, AEC-Q101 certification, and packaging. BCX18,235 is suitable for direct substitution in all applications where BCX18,215 is specified. The parts differ only in manufacturing lot designation.

Similar Functional Equivalents (Application-Dependent Substitution):

The following parts satisfy the core electrical requirements (PNP type, 25 V minimum voltage rating, 500 mA or higher current capability, surface mount TO-236-3/SOT-23-3 packaging) and are suitable for substitution in applications where secondary parameter variations are accommodated by circuit design margins:

2SA1298-Y,LF (Toshiba Semiconductor and Storage): Rated for 800 mA collector current and 120 MHz transition frequency. Lower saturation voltage (400 mV) and higher current gain (160) compared to BCX18,215. Power dissipation is 200 mW. Suitable for applications requiring enhanced switching speed or lower saturation losses. No automotive grade or AEC-Q101 qualification specified.

BC808-25LT1G (onsemi): Rated for 500 mA collector current and 100 MHz transition frequency. Higher power dissipation (300 mW) and higher saturation voltage (700 mV) compared to BCX18,215. Extended operating temperature range (-55°C to 150°C). Suitable for applications requiring wider temperature operation. No automotive grade or AEC-Q101 qualification specified.

BCX17LT1G (onsemi): Rated for 45 V collector-emitter breakdown voltage and 500 mA collector current. Higher voltage rating provides design margin for overvoltage conditions. Power dissipation is 300 mW. Extended operating temperature range (-55°C to 150°C). Transition frequency not specified. Suitable for applications requiring higher voltage headroom. No automotive grade or AEC-Q101 qualification specified.

FSB749 (onsemi): Rated for 3 A collector current and 100 MHz transition frequency. Significantly higher current capability and power dissipation (500 mW) compared to BCX18,215. Suitable for applications requiring higher current handling. No automotive grade or AEC-Q101 qualification specified.

KSA1298YMTF (onsemi): Rated for 800 mA collector current and 120 MHz transition frequency. Identical electrical characteristics to 2SA1298-Y,LF. Lower saturation voltage (400 mV) and higher current gain (160) compared to BCX18,215. Power dissipation is 200 mW. Suitable for applications requiring enhanced switching speed or lower saturation losses. No automotive grade or AEC-Q101 qualification specified.

Automotive and Compliance Considerations:

BCX18,215 and BCX18,235 are the only parts in this list carrying automotive grade designation and AEC-Q101 qualification. Applications requiring automotive-grade components must use BCX18,215 or BCX18,235. Non-automotive-grade substitutes (2SA1298-Y,LF, BC808-25LT1G, BCX17LT1G, FSB749, KSA1298YMTF) are suitable only for non-automotive applications or where automotive qualification is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can BCX18,235 be used as a direct replacement for BCX18,215?

A: Yes. BCX18,235 is a parametric equivalent with identical electrical specifications, automotive grade, AEC-Q101 qualification, and TO-236AB packaging. Direct substitution is supported in all applications.

Q: What is the primary difference between BCX18,215 and the onsemi alternatives (BC808-25LT1G, BCX17LT1G, FSB749, KSA1298YMTF)?

A: BCX18,215 carries automotive grade designation and AEC-Q101 qualification. The onsemi alternatives do not specify automotive grade or AEC-Q101 qualification. For automotive applications, BCX18,215 or BCX18,235 must be used. For non-automotive applications, onsemi parts may be substituted if secondary parameter differences are acceptable.

Q: Can 2SA1298-Y,LF or KSA1298YMTF replace BCX18,215 in a switching circuit?

A: Both parts satisfy the core electrical requirements (PNP type, 25 V voltage rating, 500 mA+ current capability, SOT-23-3 packaging). However, they differ in saturation voltage (400 mV vs. 620 mV) and current gain (160 vs. 100). Substitution is possible if circuit design accommodates these parameter variations. For automotive applications, substitution is not recommended due to lack of automotive grade and AEC-Q101 qualification.

Q: What is the advantage of BCX17LT1G over BCX18,215?

A: BCX17LT1G is rated for 45 V collector-emitter breakdown voltage compared to 25 V for BCX18,215. This higher voltage rating provides additional design margin for overvoltage transients. BCX17LT1G also offers extended operating temperature range (-55°C to 150°C). Substitution is suitable for applications where higher voltage headroom is beneficial. For automotive applications, substitution is not recommended due to lack of automotive grade and AEC-Q101 qualification.

Q: When should FSB749 be selected instead of BCX18,215?

A: FSB749 is rated for 3 A collector current and 500 mW power dissipation, compared to 500 mA and 250 mW for BCX18,215. FSB749 is suitable for applications requiring significantly higher current handling or power dissipation. For applications within the 500 mA / 250 mW envelope of BCX18,215, FSB749 is not necessary. For automotive applications, FSB749 is not recommended due to lack of automotive grade and AEC-Q101 qualification.

Q: Are all substitute parts compatible with the TO-236AB package footprint?

A: Yes. All substitute parts listed are packaged in TO-236-3, SC-59, or SOT-23-3 configurations, which are mechanically and electrically compatible with the TO-236AB footprint. PCB layout and assembly processes require no modification.

Q: What is the moisture sensitivity level (MSL) for all listed parts?

A: All parts, including BCX18,215 and all substitutes, are rated MSL 1 (Unlimited). This indicates no moisture sensitivity restrictions for storage, handling, or assembly.

Q: Can non-automotive-grade parts be used in automotive applications?

A: Use of non-automotive-grade parts in automotive applications is not recommended without explicit design approval and risk assessment. Automotive applications typically require AEC-Q101 qualification and automotive grade designation to ensure reliability and compliance with automotive standards. BCX18,215 and BCX18,235 are the only parts in this list meeting automotive requirements.

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