BSP52 NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The BSP52 is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-223-4 package. This device operates at a maximum collector current of 800 mA with a collector-emitter breakdown voltage of 80 V and maximum power dissipation of 1 W. The BSP52 is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Active alternatives with compatible or enhanced electrical characteristics are available from onsemi and other manufacturers.

Key Parameters

Parameter	BSP52 Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) Max	800 mA	mA
Voltage - Collector Emitter Breakdown (Max)	80 V	V
Vce Saturation (Max) @ Ib, Ic	1.3 V @ 500 µA, 500 mA	V
Current - Collector Cutoff (Max)	10 µA	µA
DC Current Gain (hFE) Min @ Ic, Vce	2000 @ 500 mA, 10 V	—
Power - Max	1 W	W
Operating Temperature	-55°C to 150°C	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223-4	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BSP52 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN - Darlington configuration
Voltage Rating: Collector-emitter breakdown voltage of 80 V or greater
Current Rating: Collector current capacity of 800 mA or greater
Saturation Voltage: Vce(sat) characteristics suitable for switching applications
DC Current Gain: hFE minimum of 2000 or greater at specified operating points
Power Dissipation: Maximum power rating of 1 W or greater

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: TO-261-4 or TO-261AA (SOT-223 family)
Pin Configuration: Compatible with SOT-223 footprint

Compliance Requirements:

RoHS3 Compliance
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are classified as Direct Substitutes when they meet all electrical and mechanical criteria with identical or superior ratings. Similar Substitutes are identified when they exceed the BSP52 specifications in current or power capacity while maintaining voltage and package compatibility.

Parameter Comparison

Parameter	BSP52	BSP52T1G	BSP52T3G	BSP52,115	FZT603TA	FZT692BTA
Manufacturer	onsemi	onsemi	onsemi	Nexperia USA Inc.	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN
Current - Collector (Ic) Max	800 mA	1 A	1 A	1 A	2 A	2 A
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V	80 V	80 V	70 V
Vce Saturation (Max) @ Ib, Ic	1.3 V @ 500 µA, 500 mA	1.3 V @ 500 µA, 500 mA	1.3 V @ 500 µA, 500 mA	1.3 V @ 500 µA, 500 mA	1.13 V @ 20 mA, 2 A	500 mV @ 200 mA, 2 A
Current - Collector Cutoff (Max)	10 µA	10 µA	10 µA	50 nA	10 µA	100 nA
DC Current Gain (hFE) Min @ Ic, Vce	2000 @ 500 mA, 10 V	2000 @ 500 mA, 10 V	2000 @ 500 mA, 10 V	2000 @ 500 mA, 10 V	5000 @ 500 mA, 5 V	150 @ 1 A, 2 V
Power - Max	1 W	800 mW	800 mW	1.25 W	2 W	2 W
Frequency - Transition	—	—	—	200 MHz	150 MHz	150 MHz
Operating Temperature	-55°C to 150°C	-65°C to 150°C	-65°C to 150°C	150°C	-55°C to 150°C	-55°C to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-4	SOT-223 (TO-261)	SOT-223 (TO-261)	SOT-223	SOT-223-3	SOT-223-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitutes (onsemi):

BSP52T1G and BSP52T3G are direct substitutes for the obsolete BSP52. Both parts are manufactured by onsemi, maintain the same base product number (BSP52), and provide identical electrical characteristics at the critical operating point (Vce(sat) = 1.3 V @ 500 µA, 500 mA; hFE = 2000 @ 500 mA, 10 V). The primary difference between these two parts is packaging format: BSP52T1G is supplied in Cut Tape (CT) & Digi-Reel format, while BSP52T3G is supplied in Tape & Reel (TR) format. Both are classified as Active products and are ROHS3 compliant. BSP52T1G and BSP52T3G feature an extended operating temperature range of -65°C to 150°C compared to the BSP52 range of -55°C to 150°C, providing improved low-temperature performance.

Direct Substitute (Nexperia):

BSP52,115 manufactured by Nexperia USA Inc. is a direct electrical substitute with identical voltage and current ratings (80 V, 1 A). This part is AEC-Q101 qualified and carries automotive-grade designation, making it suitable for automotive applications. BSP52,115 provides enhanced specifications including higher maximum power dissipation (1.25 W versus 1 W), transition frequency of 200 MHz, and lower collector cutoff current (50 nA versus 10 µA). The operating temperature specification for BSP52,115 is listed as 150°C maximum. All compliance requirements (ROHS3, MSL 1) are met.

Similar Substitutes (Higher Current Capacity):

FZT603TA and FZT692BTA are similar substitutes offering increased current capacity (2 A) and power dissipation (2 W) compared to the BSP52 (800 mA, 1 W). Both parts maintain the 80 V voltage rating and SOT-223 package compatibility. FZT603TA is manufactured by Diodes Incorporated and maintains the Darlington configuration with hFE minimum of 5000 @ 500 mA, 5 V. FZT692BTA is also manufactured by Diodes Incorporated but is classified as NPN (non-Darlington) with lower hFE (150 @ 1 A, 2 V) and reduced collector-emitter breakdown voltage (70 V). Both parts feature 150 MHz transition frequency and are ROHS3 compliant.

For applications requiring direct replacement of the BSP52 with identical electrical performance, BSP52T1G or BSP52T3G are the primary recommendations. For automotive applications, BSP52,115 provides equivalent performance with additional qualification. For applications requiring higher current capacity or power dissipation, FZT603TA is the preferred similar substitute, maintaining Darlington characteristics and higher current gain.

Frequently Asked Questions (FAQ)

Q: Can BSP52T1G and BSP52T3G be used interchangeably with the obsolete BSP52?

A: Yes. BSP52T1G and BSP52T3G are direct electrical and mechanical substitutes for the BSP52. Both parts share identical electrical specifications at the critical operating point (Vce(sat) = 1.3 V @ 500 µA, 500 mA; hFE = 2000 @ 500 mA, 10 V), maintain the same 80 V voltage rating and 1 A current capacity, and use the same SOT-223 package footprint. The difference between these two parts is packaging format only: BSP52T1G uses Cut Tape & Digi-Reel packaging, while BSP52T3G uses Tape & Reel packaging. Selection between them depends on assembly equipment and procurement requirements.

Q: What is the difference between BSP52T1G/BSP52T3G and BSP52,115?

A: BSP52T1G and BSP52T3G are manufactured by onsemi, while BSP52,115 is manufactured by Nexperia USA Inc. All three parts are direct electrical substitutes with identical voltage (80 V) and current (1 A) ratings. BSP52,115 provides enhanced specifications including higher power dissipation (1.25 W versus 800 mW), transition frequency of 200 MHz, and lower collector cutoff current (50 nA). BSP52,115 carries AEC-Q101 automotive qualification, making it suitable for automotive applications. For non-automotive applications, BSP52T1G or BSP52T3G are appropriate selections. For automotive applications, BSP52,115 is the recommended choice.

Q: Can FZT603TA replace the BSP52 in all applications?

A: FZT603TA is a similar substitute with higher current capacity (2 A versus 800 mA) and power dissipation (2 W versus 1 W). Both parts maintain the 80 V voltage rating and SOT-223 package compatibility. FZT603TA maintains the Darlington configuration with hFE minimum of 5000 @ 500 mA, 5 V, which is higher than the BSP52 hFE of 2000. The lower Vce(sat) of FZT603TA (1.13 V @ 20 mA, 2 A) compared to BSP52 (1.3 V @ 500 µA, 500 mA) indicates improved saturation characteristics. FZT603TA is suitable for applications where the BSP52 current or power ratings are marginal or where enhanced performance is beneficial. Circuit validation is necessary to confirm suitability for specific applications.

Q: Why is FZT692BTA listed as a similar substitute if it has a lower voltage rating (70 V versus 80 V)?

A: FZT692BTA is listed as a similar substitute based on its inclusion in the provided substitute list for the BSP52. While FZT692BTA maintains the SOT-223 package compatibility and provides higher current capacity (2 A) and power dissipation (2 W), the reduced collector-emitter breakdown voltage (70 V versus 80 V) represents a limitation compared to the BSP52. FZT692BTA is classified as NPN (non-Darlington) with significantly lower hFE (150 @ 1 A, 2 V) compared to the BSP52 Darlington configuration (hFE 2000). FZT692BTA is suitable only for applications where the 70 V voltage rating is sufficient and where the lower current gain characteristics are acceptable.

Q: Are all substitute parts ROHS3 compliant and MSL 1 rated?

A: Yes. All substitute parts listed (BSP52T1G, BSP52T3G, BSP52,115, FZT603TA, and FZT692BTA) are ROHS3 compliant and carry Moisture Sensitivity Level (MSL) rating of 1 (Unlimited). This ensures compatibility with modern manufacturing processes and storage requirements.

Q: What is the operating temperature range difference between BSP52 and its substitutes?

A: The BSP52 operates from -55°C to 150°C. BSP52T1G and BSP52T3G extend the low-temperature range to -65°C, providing improved performance in cold environments. BSP52,115 specifies a maximum operating temperature of 150°C without a minimum temperature specification in the provided data. FZT603TA and FZT692BTA both operate from -55°C to 150°C, matching the BSP52 temperature range. For applications requiring operation below -55°C, BSP52T1G or BSP52T3G are the appropriate selections.

Q: What packaging formats are available for the substitute parts?

A: BSP52T1G is supplied in Cut Tape (CT) & Digi-Reel format. BSP52T3G is supplied in Tape & Reel (TR) format. BSP52,115 is supplied in Cut Tape (CT) & Digi-Reel format. FZT603TA is supplied in Cut Tape (CT) & Digi-Reel format. FZT692BTA is supplied in Cut Tape (CT) format. All parts use the SOT-223 package footprint compatible with the BSP52 PCB layout.

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