BF720T3G Equivalent & Substitute Parts

Part Overview

The BF720T3G is an NPN bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 100 mA maximum collector current in a surface mount SOT-223 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The BF720T3G serves in general-purpose switching and amplification applications requiring moderate voltage and current ratings with compact form factor.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	300 V
Current - Collector (Ic) (Max)	100 mA
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 30mA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 25mA, 20V
Power - Max	1.5 W
Frequency - Transition	60MHz
Operating Temperature	-65°C ~ 150°C (TJ)
Package / Case	TO-261-4, TO-261AA (SOT-223)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the BF720T3G is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage - Collector Emitter Breakdown: Minimum 300 V
Current - Collector (Ic) (Max): Minimum 100 mA
Package / Case: TO-261-4 or TO-261AA (SOT-223 form factor)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Vce Saturation characteristics
DC Current Gain (hFE)
Power dissipation rating
Frequency - Transition
Operating temperature range

Substitute parts are grouped into three categories:

Direct Equivalents: Identical electrical specifications and packaging, differing only in product status or packaging format (tape & reel vs. tube).
Parametric Equivalents: Identical core electrical specifications with potential variations in secondary parameters such as power rating or frequency response, maintaining full functional compatibility.
Similar Alternatives: Parts meeting or exceeding the primary substitution criteria with variations in one or more secondary parameters, suitable for applications where the additional performance margin is acceptable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce Breakdown (Max)	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Power (Max)	Frequency	Temp Range	Package
BF720T3G	onsemi	Obsolete	100 mA	300 V	600mV @ 5mA, 30mA	50 @ 25mA, 20V	1.5 W	60MHz	-65°C ~ 150°C	SOT-223
BF720T1G	onsemi	Active	100 mA	300 V	600mV @ 5mA, 30mA	50 @ 25mA, 20V	1.5 W	60MHz	-65°C ~ 150°C	SOT-223
SBF720T1G	onsemi	Active	100 mA	300 V	600mV @ 5mA, 30mA	50 @ 25mA, 20V	1.5 W	60MHz	-65°C ~ 150°C	SOT-223
BF720,115	Nexperia USA Inc.	Active	100 mA	300 V	600mV @ 5mA, 30mA	50 @ 25mA, 20V	1.2 W	60MHz	-55°C ~ 150°C	SOT-223
BSP19,115	Nexperia USA Inc.	Active	100 mA	350 V	500mV @ 4mA, 50mA	40 @ 20mA, 10V	1.2 W	70MHz	-55°C ~ 150°C	SOT-223
FZT657TA	Diodes Incorporated	Active	500 mA	300 V	500mV @ 10mA, 100mA	50 @ 100mA, 5V	2 W	30MHz	-55°C ~ 150°C	SOT-223
FZT857TA	Diodes Incorporated	Active	3.5 A	300 V	345mV @ 600mA, 3.5A	100 @ 500mA, 10V	3 W	80MHz	-55°C ~ 150°C	SOT-223
PZTA42,115	Nexperia USA Inc.	Active	100 mA	300 V	500mV @ 2mA, 20mA	40 @ 30mA, 10V	1.2 W	50MHz	-55°C ~ 150°C	SOT-223

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolescence Mitigation):

BF720T1G and SBF720T1G are direct electrical equivalents to the BF720T3G, offering identical performance specifications with active product status. Both parts are manufactured by onsemi and maintain the same electrical characteristics across all critical parameters. BF720T1G is available in tape & reel packaging, while SBF720T1G carries the same packaging format. Selection between these two should be based on current inventory availability and packaging requirements for production processes.

Automotive-Grade Alternative:

BF720,115 manufactured by Nexperia USA Inc. provides an active alternative with AEC-Q101 automotive qualification. This part meets all primary substitution criteria with identical voltage and current ratings. The power rating is reduced to 1.2 W (compared to 1.5 W), and the operating temperature range is -55°C to 150°C. This part is suitable for applications requiring automotive-grade components.

Higher Voltage Margin:

BSP19,115 from Nexperia USA Inc. offers a 350 V collector-emitter breakdown voltage, providing additional voltage margin over the 300 V specification. This part maintains 100 mA maximum collector current and includes AEC-Q101 automotive qualification. Secondary parameters show improved frequency response (70MHz) and lower saturation voltage (500mV). This part is appropriate for designs requiring enhanced voltage headroom.

Higher Current Capability:

FZT657TA and FZT857TA from Diodes Incorporated provide increased collector current ratings (500 mA and 3.5 A respectively) while maintaining the 300 V voltage specification. These parts are suitable for applications requiring higher current handling than the original 100 mA specification. FZT657TA offers 2 W power dissipation, while FZT857TA provides 3 W. Both maintain SOT-223 packaging compatibility.

Reduced Frequency Applications:

PZTA42,115 from Nexperia USA Inc. is rated for 50MHz transition frequency (compared to 60MHz) with identical voltage and current specifications. This part includes AEC-Q101 automotive qualification and is suitable for lower-frequency switching applications where the reduced frequency specification is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BF720T1G directly replace BF720T3G in production?

A: Yes. BF720T1G is electrically identical to BF720T3G across all specified parameters. The primary difference is product status (active vs. obsolete) and packaging format. Verify packaging requirements for your production process, as BF720T1G is supplied in tape & reel format.

Q: What is the difference between BF720T1G and SBF720T1G?

A: Both parts are electrically identical to BF720T3G. The difference lies in the base product number designation (BF720 vs. SBF720). Both are manufactured by onsemi and maintain identical electrical specifications. Selection should be based on inventory availability and supplier preference.

Q: Is BF720,115 from Nexperia a suitable replacement?

A: BF720,115 meets all primary substitution criteria with identical voltage (300 V) and current (100 mA) ratings. The power rating is reduced to 1.2 W, and it includes AEC-Q101 automotive qualification. This part is suitable if your application does not require the full 1.5 W power dissipation and automotive qualification is acceptable.

Q: When should I use BSP19,115 instead of a direct equivalent?

A: BSP19,115 is appropriate when your circuit design benefits from higher voltage margin (350 V vs. 300 V) or improved frequency response (70MHz vs. 60MHz). The lower saturation voltage (500mV) may also provide performance advantages in switching applications. This part includes automotive qualification.

Q: Can FZT657TA or FZT857TA replace BF720T3G?

A: FZT657TA and FZT857TA maintain the 300 V voltage specification and SOT-223 packaging but provide significantly higher collector current ratings (500 mA and 3.5 A respectively). These parts are suitable only if your application can accommodate the higher current capability. The reduced frequency response of FZT657TA (30MHz) may limit suitability for high-frequency applications.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (BF720T1G, SBF720T1G, BF720,115, BSP19,115, FZT657TA, FZT857TA, PZTA42,115) are RoHS3 compliant. The original BF720T3G does not specify RoHS status due to its obsolete classification.

Q: What is the operating temperature difference between BF720T3G and substitute parts?

A: BF720T3G operates from -65°C to 150°C. Most active substitutes operate from -55°C to 150°C, providing a 10°C reduction in the lower temperature limit. Verify this specification against your application requirements if operation below -55°C is necessary.

Q: Do all substitute parts use the same SOT-223 package?

A: Yes. All substitute parts listed maintain the SOT-223 (TO-261-4, TO-261AA) surface mount package, ensuring mechanical and footprint compatibility with designs originally specified for BF720T3G.

Q: Which substitute offers the best overall compatibility?

A: BF720T1G and SBF720T1G provide the highest compatibility, offering identical electrical specifications to BF720T3G with active product status. These parts require no circuit redesign or performance verification and are the recommended first choice for obsolescence replacement.

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