BSP50,115 Equivalent & Substitute Parts

Part Overview

The BSP50,115 is an NPN Darlington bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in the SOT-223 package. This active product operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 45 V, making it suitable for general-purpose switching and amplification circuits. The device is AEC-Q101 qualified for automotive applications and carries ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges, or when design requirements permit operation within extended parameter boundaries.

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	—
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	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the BSP50,115 are grouped based on the following substitution criteria:

Primary Substitution Criteria:

Transistor Type: NPN configuration (Darlington or standard NPN)
Package Compatibility: SOT-223 surface mount package (TO-261-4, TO-261AA)
Current Rating: Collector current (Ic) equal to or greater than 1 A
Voltage Rating: Collector-emitter breakdown voltage equal to or greater than 45 V
Saturation Voltage: Vce(sat) performance at specified bias conditions
DC Current Gain: hFE characteristics suitable for switching applications
RoHS Compliance: ROHS3 compliant status
Moisture Sensitivity: MSL 1 (Unlimited)

Substitution Logic:

Parts are considered equivalent when they maintain the same package footprint, support the required current and voltage specifications, and demonstrate compatible saturation characteristics. The BSP52T1G and BSP52T3G (onsemi) provide higher voltage ratings (80 V) while maintaining 1 A current capability and identical saturation voltage specifications, permitting use in applications with higher voltage headroom. The CZTA27 TR PBFREE (Central Semiconductor Corp) operates at reduced current (500 mA) and elevated voltage (60 V) with different saturation characteristics, suitable for lower-current applications. The FZT690BTA (Diodes Incorporated) operates as a standard NPN transistor with higher current capability (3 A) and matching voltage rating (45 V), providing alternative performance characteristics for higher-current switching requirements.

Parameter Comparison

Parameter	BSP50,115	BSP52T1G	BSP52T3G	CZTA27 TR PBFREE	FZT690BTA
Manufacturer	Nexperia USA Inc.	onsemi	onsemi	Central Semiconductor Corp	Diodes Incorporated
Transistor Type	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN
Current - Collector (Ic) (Max)	1 A	1 A	1 A	500 mA	3 A
Voltage - Collector Emitter Breakdown (Max)	45 V	80 V	80 V	60 V	45 V
Vce Saturation (Max) @ Ib, Ic	1.3V @ 500µA, 500mA	1.3V @ 500µA, 500mA	1.3V @ 500µA, 500mA	1.5V @ 100µA, 100mA	500mV @ 5mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	2000 @ 500mA, 10V	2000 @ 500mA, 10V	2000 @ 500mA, 10V	10000 @ 100mA, 5V	150 @ 2A, 2V
Power - Max	1.25 W	800 mW	800 mW	2 W	2 W
Frequency - Transition	200 MHz	—	—	125 MHz	150 MHz
Operating Temperature (TJ)	150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223	SOT-223 (TO-261)	SOT-223 (TO-261)	SOT-223	SOT-223-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BSP52T1G and BSP52T3G (onsemi): Both parts are active products with ROHS3 compliance and MSL 1 rating. These Darlington transistors maintain identical saturation voltage and current gain specifications to the BSP50,115 while providing elevated voltage ratings (80 V). The extended operating temperature range (-65°C to 150°C) accommodates broader environmental conditions. BSP52T1G is supplied in Cut Tape and Digi-Reel packaging, while BSP52T3G is supplied in Tape & Reel format. Selection between these variants depends on packaging and inventory requirements.

CZTA27 TR PBFREE (Central Semiconductor Corp): This active product is ROHS3 compliant with MSL 1 rating and operates at reduced collector current (500 mA) with elevated voltage rating (60 V). The higher DC current gain (10000 @ 100mA, 5V) and increased power dissipation capability (2 W) support applications requiring lower switching currents with enhanced gain characteristics. The extended operating temperature range (-65°C to 150°C) provides environmental flexibility. This part is suitable for designs where current requirements do not exceed 500 mA.

FZT690BTA (Diodes Incorporated): This active product is ROHS3 compliant with MSL 1 rating and operates as a standard NPN transistor with higher current capability (3 A) at the same voltage rating (45 V) as the BSP50,115. The significantly lower saturation voltage (500 mV @ 5mA, 1A) and reduced DC current gain (150 @ 2A, 2V) reflect standard NPN characteristics rather than Darlington configuration. This part is suitable for applications requiring higher current switching with lower saturation voltage performance. The extended operating temperature range (-55°C to 150°C) supports diverse environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can BSP52T1G or BSP52T3G be used as direct replacements for BSP50,115?

A: Yes, within design constraints. Both parts maintain identical saturation voltage (1.3V @ 500µA, 500mA) and DC current gain (2000 @ 500mA, 10V) specifications. The higher voltage rating (80 V versus 45 V) permits operation in circuits with higher supply voltages. Packaging differences exist: BSP52T1G uses Cut Tape and Digi-Reel, while BSP52T3G uses Tape & Reel. Verify packaging compatibility with assembly equipment before selection.

Q: What are the differences between Darlington and standard NPN transistors in this comparison?

A: The BSP50,115, BSP52T1G, BSP52T3G, and CZTA27 TR PBFREE are Darlington configurations, which combine two transistors internally to achieve high current gain (hFE values of 2000 to 10000). The FZT690BTA is a standard NPN transistor with lower current gain (150 @ 2A, 2V) but higher current capability (3 A). Darlington transistors exhibit higher saturation voltage (1.3V to 1.5V), while standard NPN transistors show lower saturation voltage (500 mV). Circuit design must account for these saturation voltage differences.

Q: Is the CZTA27 TR PBFREE suitable for applications requiring 1 A collector current?

A: No. The CZTA27 TR PBFREE is rated for maximum collector current of 500 mA. Applications requiring 1 A operation must use BSP50,115, BSP52T1G, BSP52T3G, or FZT690BTA. The CZTA27 is suitable only for designs where collector current does not exceed 500 mA.

Q: Can FZT690BTA replace BSP50,115 in all applications?

A: FZT690BTA operates as a standard NPN transistor rather than a Darlington configuration. The significantly lower saturation voltage (500 mV versus 1.3V) and reduced DC current gain (150 versus 2000) require circuit design verification. Applications sensitive to saturation voltage or requiring high current gain may not function identically. The higher current capability (3 A) permits use in higher-current switching applications. Electrical simulation or prototype testing is necessary to confirm functional equivalence in specific circuit designs.

Q: What packaging options are available for these substitute parts?

A: All substitute parts use SOT-223 surface mount packages with TO-261-4 or TO-261AA case designations, maintaining mechanical compatibility with BSP50,115. BSP52T1G is supplied in Cut Tape (CT) and Digi-Reel packaging. BSP52T3G is supplied in Tape & Reel (TR) format. CZTA27 TR PBFREE is supplied in Tape & Reel format. FZT690BTA is supplied in Cut Tape format. Packaging selection depends on assembly equipment compatibility and inventory management requirements.

Q: Are all substitute parts automotive qualified?

A: The BSP50,115 carries AEC-Q101 automotive qualification. The substitute parts (BSP52T1G, BSP52T3G, CZTA27 TR PBFREE, and FZT690BTA) are listed as active products with ROHS3 compliance and MSL 1 rating, but automotive qualification status is not specified in the provided data. Applications requiring AEC-Q101 qualification must confirm compliance with the substitute part manufacturer before selection.

Q: What is the significance of the extended operating temperature range in substitute parts?

A: The BSP50,115 specifies maximum operating temperature of 150°C. Substitute parts BSP52T1G, BSP52T3G, and CZTA27 TR PBFREE specify operating ranges of -65°C to 150°C, while FZT690BTA specifies -55°C to 150°C. The extended lower temperature limit permits operation in colder environments. Circuit designs operating at temperatures below 0°C must use substitute parts with extended temperature ranges. Designs operating only at positive temperatures may use any listed part.

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