BSP50-QX Equivalent & Substitute Parts

Part Overview

The BSP50-QX is an NPN Darlington bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in automotive-grade circuits. This component operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 45 V and delivers a maximum power dissipation of 1.25 W. The device is currently in active production status and carries AEC-Q101 automotive qualification, making it suitable for demanding automotive and industrial applications requiring reliable switching and amplification performance.

Substitute parts are necessary when the primary part number becomes unavailable due to supply chain constraints, inventory depletion, or manufacturing discontinuation. Identifying equivalent components with matching electrical and mechanical specifications ensures design continuity and system reliability without requiring circuit redesign.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	1.3V @ 500µA, 500mA	V
Current - Collector Cutoff (Max)	50	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	2000 @ 500mA, 10V	—
Power - Max	1.25	W
Frequency - Transition	200	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BSP50-QX is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

Transistor topology: NPN Darlington configuration
Maximum collector current: 1 A
Collector-emitter breakdown voltage: 45 V
Saturation voltage: 1.3 V at specified base and collector currents
DC current gain (hFE): minimum 2000 at 500 mA collector current and 10 V collector-emitter voltage
Transition frequency: 200 MHz
Maximum power dissipation: 1.25 W
Operating temperature range: 150°C maximum junction temperature

Mechanical & Packaging Specifications:

Mounting type: Surface mount only
Package designation: SOT-223 (TO-261-4, TO-261AA)
Tape & Reel packaging format

Compliance & Qualification:

Automotive grade classification
AEC-Q101 qualification requirement
ROHS3 compliance
REACH unaffected status

The identified substitute part BSP50,115 meets all electrical and mechanical parameters specified above and maintains identical compliance certifications.

Parameter Comparison

Parameter	BSP50-QX	BSP50,115	Match
Transistor Type	NPN - Darlington	NPN - Darlington	✓
Current - Collector (Ic) (Max)	1 A	1 A	✓
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓
Vce Saturation (Max) @ Ib, Ic	1.3V @ 500µA, 500mA	1.3V @ 500µA, 500mA	✓
Current - Collector Cutoff (Max)	50 nA	50 nA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	2000 @ 500mA, 10V	2000 @ 500mA, 10V	✓
Power - Max	1.25 W	1.25 W	✓
Frequency - Transition	200 MHz	200 MHz	✓
Operating Temperature (TJ)	150°C	150°C	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	✓
Supplier Device Package	SOT-223	SOT-223	✓
Grade	Automotive	Automotive	✓
Qualification	AEC-Q101	AEC-Q101	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓

Engineering Selection Recommendations

The BSP50,115 is a direct parametric equivalent to the BSP50-QX and is suitable for substitution in all applications where the primary part number is unavailable. Both components are manufactured by Nexperia USA Inc. and carry identical electrical specifications, mechanical packaging, and automotive-grade certifications.

Selection Basis:

Both the BSP50-QX and BSP50,115 maintain active product status, ensuring continued availability and manufacturing support. The substitute part carries AEC-Q101 qualification, confirming compliance with automotive reliability and quality standards. ROHS3 compliance and REACH unaffected status are maintained across both part numbers, satisfying environmental and regulatory requirements for automotive and industrial applications.

The SOT-223 surface mount package and TO-261-4/TO-261AA case designations are identical, permitting direct board-level substitution without PCB redesign or layout modification. Electrical performance characteristics, including current handling, voltage ratings, gain specifications, and thermal operating limits, are fully matched.

Frequently Asked Questions (FAQ)

Q: Can BSP50,115 be used as a direct replacement for BSP50-QX on existing PCBs?

A: Yes. The BSP50,115 is electrically and mechanically equivalent to the BSP50-QX. Both components use the SOT-223 package with TO-261-4 and TO-261AA case designations, enabling direct substitution without PCB modification or rework.

Q: Are there differences in automotive qualification between these parts?

A: No. Both the BSP50-QX and BSP50,115 carry AEC-Q101 automotive qualification and are classified as automotive-grade components. Compliance certifications are identical.

Q: What are the critical electrical parameters that define substitution eligibility?

A: Substitution is determined by matching the following parameters: NPN Darlington transistor topology, 1 A maximum collector current, 45 V collector-emitter breakdown voltage, 1.3 V saturation voltage at specified operating points, 2000 minimum DC current gain, 200 MHz transition frequency, 1.25 W maximum power dissipation, and 150°C maximum junction temperature.

Q: Do both parts meet environmental compliance requirements?

A: Yes. Both the BSP50-QX and BSP50,115 are ROHS3 compliant and REACH unaffected, satisfying environmental and regulatory requirements for automotive and industrial applications.

Q: Is the SOT-223 package identical for both part numbers?

A: Yes. Both components use the SOT-223 supplier device package with TO-261-4 and TO-261AA case designations. Pin configuration and mechanical dimensions are identical, permitting direct board-level substitution.

Q: What is the difference between BSP50-QX and BSP50,115 designations?

A: The designations reflect different manufacturing batches or packaging configurations from Nexperia USA Inc. The electrical specifications and performance characteristics are identical. BSP50,115 is the base product number variant.

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