BSP52T3 NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The BSP52T3 is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface mount SOT-223 (TO-261) package. This device is classified as obsolete product status. Due to its obsolete classification, direct equivalents and substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and DC current gain characteristics.

Key Parameters

Parameter	BSP52T3 Value	Unit
Transistor Type	NPN - Darlington	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	1	A
Vce Saturation (Max) @ Ib, Ic	1.3V @ 500µA, 500mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	2000 @ 500mA, 10V	—
Power - Max	800	mW
Operating Temperature Range	-65 to 150	°C
Package / Case	TO-261-4, TO-261AA	—
Mounting Type	Surface Mount	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BSP52T3 are categorized based on electrical parameter compatibility. The primary substitution criteria are:

Direct Electrical Equivalents maintain identical or superior ratings across all critical parameters: 80 V collector-emitter breakdown voltage, 1 A maximum collector current, 1.3 V Vce saturation at specified bias conditions, and 2000 minimum DC current gain. These parts are pin-compatible in SOT-223 packaging and support identical circuit functionality without design modification.

Voltage-Rated Alternatives provide lower collector-emitter breakdown voltages (60 V or 45 V) while maintaining 1 A collector current capacity and equivalent DC current gain. These parts are suitable for applications where the circuit operates below the lower voltage threshold.

Current-Enhanced Alternatives provide higher collector current ratings (2 A) at the same or similar voltage ratings (70 V to 80 V). These parts offer increased current handling capacity and are backward-compatible for applications requiring additional current margin.

All substitute parts maintain surface mount SOT-223 packaging, NPN Darlington transistor topology, and compatible thermal operating ranges.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Vce Breakdown (V)	Ic Max (A)	Vce Sat (V)	hFE Min	Power Max (mW)	Frequency (MHz)	Product Status	RoHS Status
BSP52T3	onsemi	NPN - Darlington	80	1	1.3	2000	800	—	Obsolete	Non-compliant
BSP52T3G	onsemi	NPN - Darlington	80	1	1.3	2000	800	—	Active	ROHS3 Compliant
BSP52,115	Nexperia USA Inc.	NPN - Darlington	80	1	1.3	2000	1250	200	Active	ROHS3 Compliant
BSP51,115	Nexperia USA Inc.	NPN - Darlington	60	1	1.3	2000	1250	200	Active	ROHS3 Compliant
BSP50,115	Nexperia USA Inc.	NPN - Darlington	45	1	1.3	2000	1250	200	Active	ROHS3 Compliant
FZT603TA	Diodes Incorporated	NPN - Darlington	80	2	1.13	5000	2000	150	Active	ROHS3 Compliant
FZT692BTA	Diodes Incorporated	NPN	70	2	0.5	150	2000	150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Specifications):

BSP52T3G is the primary direct replacement for BSP52T3. Both parts share identical electrical ratings: 80 V collector-emitter breakdown, 1 A maximum collector current, 1.3 V Vce saturation, and 2000 minimum DC current gain. BSP52T3G carries active product status and ROHS3 compliance, addressing the obsolescence and regulatory requirements of the original part. Packaging and pinout are identical, requiring no circuit modification.

Direct Replacement with Enhanced Specifications:

BSP52,115 (Nexperia) provides identical voltage and current ratings to BSP52T3 with enhanced power dissipation (1.25 W versus 800 mW) and 200 MHz transition frequency. This part includes automotive-grade qualification (AEC-Q101) and active product status. The increased power rating provides additional thermal margin in applications approaching the original 800 mW limit.

Voltage-Reduced Alternatives:

BSP51,115 (60 V rating) and BSP50,115 (45 V rating) are suitable for applications where circuit voltage does not exceed their respective breakdown ratings. Both maintain 1 A collector current, 2000 minimum DC current gain, and automotive qualification. These parts are appropriate for lower-voltage circuit implementations.

Current-Enhanced Alternatives:

FZT603TA (Diodes Incorporated) provides 2 A collector current at 80 V breakdown voltage, maintaining Darlington topology. This part is suitable for applications requiring increased current capacity or additional design margin. FZT603TA includes 150 MHz transition frequency and 2 W power rating.

FZT692BTA (Diodes Incorporated) provides 2 A collector current at 70 V breakdown voltage with standard NPN topology (not Darlington). This part exhibits lower DC current gain (150 minimum) and lower Vce saturation (0.5 V), making it suitable for applications where these characteristics are acceptable.

Compliance Considerations:

All substitute parts listed carry ROHS3 compliance and active product status, addressing regulatory and supply chain requirements. BSP52T3 is non-compliant and obsolete; substitution is necessary for new designs and long-term production support.

Frequently Asked Questions (FAQ)

Q: Can BSP52T3G directly replace BSP52T3 without circuit modification?

A: Yes. BSP52T3G is electrically and mechanically identical to BSP52T3. Both parts share the same voltage rating (80 V), current rating (1 A), Vce saturation (1.3 V), DC current gain (2000 minimum), and SOT-223 package. No circuit changes are required.

Q: What is the difference between BSP52T3 and BSP52,115?

A: BSP52,115 provides identical voltage (80 V) and current (1 A) ratings but with increased power dissipation (1.25 W versus 800 mW) and 200 MHz transition frequency. BSP52,115 includes automotive-grade qualification (AEC-Q101). Both parts are pin-compatible in SOT-223 packaging.

Q: Can I use BSP51,115 or BSP50,115 as substitutes for BSP52T3?

A: BSP51,115 and BSP50,115 are suitable only if your circuit operates below their respective voltage ratings (60 V and 45 V). Both maintain 1 A collector current and 2000 minimum DC current gain. If your application requires 80 V breakdown voltage, these parts are not appropriate.

Q: What is the advantage of FZT603TA over BSP52T3?

A: FZT603TA provides doubled collector current capacity (2 A versus 1 A) at the same 80 V breakdown voltage. This part is suitable for applications requiring higher current handling or additional design margin. FZT603TA maintains Darlington topology and includes 150 MHz transition frequency.

Q: Why does FZT692BTA have lower DC current gain than BSP52T3?

A: FZT692BTA is a standard NPN transistor (not Darlington), resulting in lower DC current gain (150 minimum versus 2000 minimum). This part is suitable only for applications where lower gain is acceptable. FZT692BTA provides 2 A collector current at 70 V breakdown voltage.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (BSP52T3G, BSP52,115, BSP51,115, BSP50,115, FZT603TA, FZT692BTA) carry ROHS3 compliance. The original BSP52T3 is non-compliant and obsolete.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in SOT-223 (TO-261) surface mount packaging, identical to BSP52T3. Packaging options vary by supplier: BSP52T3G is available in Tape & Reel; BSP52,115 and FZT603TA are available in Cut Tape & Digi-Reel; BSP51,115, BSP50,115, and FZT692BTA are available in Tape & Reel.

Q: Can I use FZT603TA in a circuit designed for BSP52T3?

A: FZT603TA is backward-compatible for BSP52T3 applications. It provides higher current capacity (2 A versus 1 A) and maintains 80 V breakdown voltage and Darlington topology. However, the higher current rating and different Vce saturation characteristics (1.13 V versus 1.3 V) may affect circuit behavior in current-limited applications. Verify circuit performance under actual operating conditions.

Q: What is the operating temperature range for substitute parts?

A: BSP52T3G maintains the original range (-65°C to 150°C). Nexperia parts (BSP52,115, BSP51,115, BSP50,115) specify 150°C maximum. Diodes Incorporated parts (FZT603TA, FZT692BTA) specify -55°C to 150°C. Verify compatibility with your application's thermal requirements.

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