BCX55-QF Equivalent & Substitute Parts

Part Overview

The BCX55-QF is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for general-purpose switching and amplification applications. This surface mount device operates at a maximum collector current of 1 A, collector-emitter breakdown voltage of 60 V, and maximum power dissipation of 500 mW. The BCX55-QF is classified as an active product with automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Substitute parts are identified to address inventory availability, supply chain continuity, or specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	1	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	63 @ 150mA, 2V	—
Power - Max	500	mW
Frequency - Transition	180	MHz
Operating Temperature (TJ)	150	°C
Package / Case	TO-243AA	—
Supplier Device Package	SOT-89	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BCX55-QF is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part BCX55-10-QX is classified as a parametric equivalent because it maintains identical specifications across the following key parameters:

Transistor type: NPN
Maximum collector current: 1 A
Collector-emitter breakdown voltage: 60 V
Saturation voltage: 500mV @ 50mA, 500mA
Collector cutoff current: 100nA
DC current gain: 63 @ 150mA, 2V
Maximum power dissipation: 500 mW
Transition frequency: 180 MHz
Operating temperature: 150°C
Package type: TO-243AA / SOT-89
Mounting configuration: Surface Mount
Automotive grade and AEC-Q101 qualification
RoHS3 compliance

Both parts are manufactured by Nexperia USA Inc. and are active products. The BCX55-10-QX differs only in internal device designation and moisture sensitivity level specification, which does not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	BCX55-QF	BCX55-10-QX	Match
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	✓
Category	Transistors, Bipolar (BJT)	Transistors, Bipolar (BJT)	✓
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) (Max)	1 A	1 A	✓
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	✓
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	✓
Current - Collector Cutoff (Max)	100nA	100nA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	63 @ 150mA, 2V	63 @ 150mA, 2V	✓
Power - Max	500 mW	500 mW	✓
Frequency - Transition	180MHz	180MHz	✓
Operating Temperature (TJ)	150°C	150°C	✓
Package / Case	TO-243AA	TO-243AA	✓
Supplier Device Package	SOT-89	SOT-89	✓
Mounting Type	Surface Mount	Surface Mount	✓
Grade	Automotive	Automotive	✓
Qualification	AEC-Q101	AEC-Q101	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

Both the BCX55-QF and BCX55-10-QX are active products with identical electrical specifications and mechanical packaging. Selection between these parts is based on the following criteria:

BCX55-QF: Use when the specific device designation is required by design documentation or when inventory of this exact part number is available.

BCX55-10-QX: Use as a direct substitute when BCX55-QF is unavailable. This part carries identical performance characteristics and meets all automotive and compliance requirements. The BCX55-10-QX maintains higher inventory levels (1924 Pcs vs. 994 Pcs), providing improved supply chain availability.

Both parts satisfy AEC-Q101 automotive qualification and RoHS3 compliance requirements. No design modifications or circuit re-evaluation are required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can BCX55-10-QX be used as a direct replacement for BCX55-QF in automotive applications?

A: Yes. Both parts are automotive-grade, AEC-Q101 qualified, and share identical electrical and mechanical specifications. Direct substitution is permissible without circuit modification.

Q: Are the package dimensions identical between BCX55-QF and BCX55-10-QX?

A: Yes. Both parts use the TO-243AA package type with SOT-89 supplier device package configuration. PCB footprints and mounting requirements are identical.

Q: What is the difference between BCX55-QF and BCX55-10-QX?

A: The parts differ only in internal device designation and moisture sensitivity level specification. All electrical parameters, maximum ratings, and performance characteristics are identical.

Q: Do both parts meet RoHS and REACH compliance?

A: Yes. Both BCX55-QF and BCX55-10-QX are RoHS3 compliant and REACH unaffected.

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

A: Yes. Both parts feature a transition frequency of 180 MHz and identical saturation characteristics, supporting equivalent performance in switching applications up to this frequency limit.

Q: What is the maximum operating temperature for both parts?

A: Both parts operate at a maximum junction temperature (TJ) of 150°C.

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