BC54PAS-QX Equivalent & Substitute Parts

Part Overview

The BC54PAS-QX is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in automotive-grade circuits. This active product operates at a maximum collector current of 1 A, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 420 mW. The device is packaged in a 3-UDFN Exposed Pad (DFN2020D-3) configuration and qualifies under AEC-Q101 automotive standards. Substitute parts are identified based on identical electrical specifications, mechanical compatibility, and compliance certifications to ensure direct functional replacement in existing designs.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max)	500 mV @ 50 mA, 500 mA	mV
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min	63 @ 150 mA, 2 V	—
Power - Max	420	mW
Frequency - Transition	180	MHz
Operating Temperature (TJ)	150	°C
Package / Case	3-UDFN Exposed Pad	—
Supplier Device Package	DFN2020D-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BC54PAS-QX are qualified based on the following criteria:

Electrical Parameter Equivalence: All substitute parts maintain identical maximum ratings for collector current (1 A), collector-emitter breakdown voltage (45 V), saturation voltage (500 mV @ 50 mA, 500 mA), collector cutoff current (100 nA), DC current gain (63 @ 150 mA, 2 V), maximum power dissipation (420 mW), and transition frequency (180 MHz).

Mechanical Compatibility: All substitute parts use the identical 3-UDFN Exposed Pad package (DFN2020D-3) with surface mount mounting type, ensuring direct footprint compatibility on printed circuit boards.

Compliance and Certification: Substitute parts maintain automotive-grade qualification under AEC-Q100 or AEC-Q101 standards and ROHS3 compliance, ensuring suitability for regulated applications.

Packaging Format Variations: Substitute parts are available in Tape & Reel (TR) or Bulk packaging formats, which do not affect electrical or mechanical performance but may influence procurement and handling procedures.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency (fT)	Package	Mounting	Grade	Qualification	RoHS	Packaging Format
BC54PAS-QX	Nexperia USA Inc.	1 A	45 V	420 mW	180 MHz	3-UDFN Exposed Pad	Surface Mount	Automotive	AEC-Q101	ROHS3	Tape & Reel
BC54-10PAS-QX	Nexperia USA Inc.	1 A	45 V	420 mW	180 MHz	3-UDFN Exposed Pad	Surface Mount	Automotive	AEC-Q101	ROHS3	Tape & Reel
BC54-10PASX	NXP Semiconductors	1 A	45 V	420 mW	180 MHz	3-UDFN Exposed Pad	Surface Mount	—	—	—	Bulk
BC54-16PASX	Nexperia USA Inc.	1 A	45 V	420 mW	180 MHz	3-UDFN Exposed Pad	Surface Mount	Automotive	AEC-Q100	ROHS3	Tape & Reel
BC54PASX	Nexperia USA Inc.	1 A	45 V	420 mW	180 MHz	3-UDFN Exposed Pad	Surface Mount	Automotive	AEC-Q100	ROHS3	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility): BC54-10PAS-QX and BC54PASX are direct substitutes with identical electrical specifications, automotive-grade classification, and AEC-Q100 or AEC-Q101 qualification. Both are manufactured by Nexperia USA Inc. and supplied in Tape & Reel packaging, matching the original part's procurement format.

Secondary Substitute (Tape & Reel Format): BC54-16PASX maintains full electrical equivalence and automotive-grade status with AEC-Q100 qualification. This part is suitable for applications where AEC-Q100 certification is acceptable in place of AEC-Q101.

Alternative Substitute (Bulk Packaging): BC54-10PASX provides electrical equivalence but is supplied by NXP Semiconductors in Bulk packaging format rather than Tape & Reel. This part lacks documented automotive-grade classification and qualification certification in the provided specifications. Selection of this part requires confirmation that bulk packaging and absence of explicit automotive certification are acceptable for the target application.

All substitute parts are active products with confirmed inventory availability and maintain ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can BC54-10PAS-QX be used as a direct replacement for BC54PAS-QX?

A: Yes. BC54-10PAS-QX is electrically and mechanically equivalent to BC54PAS-QX. Both parts share identical electrical parameters (1 A collector current, 45 V breakdown voltage, 420 mW power, 180 MHz transition frequency), the same 3-UDFN Exposed Pad package, automotive-grade classification, and AEC-Q101 qualification. Both are supplied in Tape & Reel format.

Q: What is the difference between BC54PASX and BC54-16PASX?

A: Both parts are electrically identical to BC54PAS-QX with respect to collector current, breakdown voltage, power dissipation, and transition frequency. The primary difference is qualification standard: BC54PASX carries AEC-Q100 certification, while BC54-16PASX carries AEC-Q100 certification. Both are automotive-grade and ROHS3 compliant. Selection between these parts depends on whether AEC-Q100 or AEC-Q101 certification is required by the application specification.

Q: Why is BC54-10PASX listed as a substitute if it lacks automotive-grade designation?

A: BC54-10PASX is electrically and mechanically equivalent to BC54PAS-QX, meeting all electrical parameter requirements and using the identical DFN2020D-3 package. However, the provided specifications do not document automotive-grade classification or AEC qualification for this part. Use of BC54-10PASX in automotive applications requires confirmation that the absence of explicit automotive certification is acceptable for the target design and regulatory environment.

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

A: Yes. All substitute parts use the 3-UDFN Exposed Pad package (DFN2020D-3) with surface mount mounting type. PCB footprints, land patterns, and assembly processes are identical across all listed parts.

Q: What is the significance of packaging format (Tape & Reel versus Bulk)?

A: Packaging format affects procurement, handling, and assembly procedures but does not alter electrical or mechanical performance. Tape & Reel packaging is standard for automated assembly lines and high-volume production. Bulk packaging is typically used for lower-volume applications or manual assembly. Selection depends on manufacturing process requirements and inventory management practices.

Q: Can I substitute BC54-10PASX (Bulk) for BC54PAS-QX (Tape & Reel) in a production environment?

A: Electrical and mechanical substitution is valid. However, packaging format change from Tape & Reel to Bulk may require process modifications for automated pick-and-place assembly. Procurement and supply chain considerations must be evaluated separately from component equivalence.

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