BC51-16PASX Equivalent & Substitute Parts

Part Overview

The BC51-16PASX is an active PNP bipolar junction transistor manufactured by Nexperia USA Inc., designed for general-purpose switching and amplification applications. This device operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 45 V and delivers 420 mW maximum power dissipation. The transistor is packaged in a 3-UDFN Exposed Pad surface mount configuration (DFN2020D-3) and features a transition frequency of 145 MHz, making it suitable for moderate-speed signal processing circuits. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent substitute parts are identified based on identical electrical performance parameters and mechanical compatibility within the same package family.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max)	500	mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min	63	@ 150mA, 2V
Power - Max	420	mW
Frequency - Transition	145	MHz
Operating Temperature (TJ)	150	°C
Package / Case	3-UDFN Exposed Pad	DFN2020D-3
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the BC51-16PASX are identified as parametric equivalents based on matching all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain identical across all equivalent devices:

Transistor Type: PNP configuration
Maximum Collector Current (Ic): 1 A
Collector-Emitter Breakdown Voltage: 45 V
Saturation Voltage (Vce): 500 mV @ 50mA, 500mA
Collector Cutoff Current (ICBO): 100 nA
DC Current Gain (hFE): 63 minimum @ 150mA, 2V
Maximum Power Dissipation: 420 mW
Transition Frequency: 145 MHz
Operating Temperature: 150°C maximum junction temperature
Package Configuration: 3-UDFN Exposed Pad (DFN2020D-3)
Mounting Technology: Surface Mount

All identified substitute parts maintain identical performance characteristics and are mechanically compatible with the original BC51-16PASX design. Differences in packaging format (Tape & Reel versus Bulk) and minor manufacturer nomenclature variations do not affect electrical or functional equivalence.

Parameter Comparison

Parameter	BC51-16PASX	BC51-10PASX	BC51PASX
Manufacturer	Nexperia USA Inc.	NXP USA Inc.	NXP Semiconductors
Transistor Type	PNP	PNP	PNP
Current - Collector (Ic) Max	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V
Vce Saturation (Max)	500 mV @ 50mA, 500mA	500 mV @ 50mA, 500mA	500 mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA
DC Current Gain (hFE) Min	63 @ 150mA, 2V	63 @ 150mA, 2V	63 @ 150mA, 2V
Power - Max	420 mW	420 mW	420 mW
Frequency - Transition	145 MHz	145 MHz	145 MHz
Operating Temperature (TJ)	150°C	150°C	150°C
Package / Case	3-UDFN Exposed Pad	3-UDFN Exposed Pad	3-UDFN Exposed Pad
Supplier Device Package	DFN2020D-3	DFN2020D-3	DFN2020D-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts—BC51-16PASX, BC51-10PASX, and BC51PASX—are active production devices manufactured by Nexperia/NXP and are suitable for direct substitution in applications requiring PNP bipolar junction transistors with the specified electrical and thermal characteristics.

Compliance and Certification Status:

BC51-16PASX: RoHS3 Compliant, REACH Unaffected, MSL 1 (Unlimited), ECCN EAR99
BC51-10PASX: ECCN EAR99, HTSUS 8541.29.0075
BC51PASX: ECCN EAR99, HTSUS 8541.29.0075

All parts meet regulatory requirements for commercial and industrial applications. Selection between these equivalents may be determined by packaging availability (Tape & Reel versus Bulk format) and supply chain considerations rather than electrical performance, as all devices deliver identical functional characteristics within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can BC51-10PASX and BC51PASX be used interchangeably with BC51-16PASX in existing circuit designs?

A: Yes. All three parts are parametric equivalents with identical electrical specifications, maximum ratings, and package configurations. Direct substitution is supported without circuit modification.

Q: What is the difference between the Tape & Reel and Bulk packaging formats?

A: Tape & Reel packaging is supplied on continuous carrier tape suitable for automated assembly processes. Bulk packaging contains loose components. Both formats contain identical devices; the difference is in delivery and handling method only. Electrical and mechanical properties remain unchanged.

Q: Are there any thermal or frequency performance differences between these substitute parts?

A: No. All three parts share identical maximum junction temperature (150°C), transition frequency (145 MHz), and power dissipation ratings (420 mW). Thermal and frequency performance is equivalent across all substitutes.

Q: Do these parts require different PCB layout or soldering procedures?

A: No. All parts use the identical 3-UDFN Exposed Pad (DFN2020D-3) package configuration. PCB footprints, solder reflow profiles, and assembly procedures are identical.

Q: What is the significance of the DC Current Gain (hFE) specification of 63 minimum?

A: The hFE minimum of 63 at 150 mA collector current and 2 V collector-emitter voltage defines the minimum amplification factor for these devices. This specification is identical across all three substitute parts, ensuring consistent circuit performance in amplification applications.

Q: Are moisture sensitivity considerations the same for all three parts?

A: Yes. All parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control measures are required during storage or handling.

Q: Can these parts be used in high-frequency switching applications?

A: Yes. The 145 MHz transition frequency supports switching applications in the moderate-frequency range. All three substitute parts are electrically identical for this application class.

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