FZT649 Equivalent & Substitute Parts

Part Overview

The FZT649 is an NPN bipolar junction transistor manufactured by onsemi, rated for 25 V collector-emitter breakdown voltage and 3 A maximum collector current. The device is housed in a SOT-223-4 surface mount package and is designed for general-purpose switching and amplification applications requiring 2 W power dissipation capability. The FZT649 maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to address inventory availability, packaging format requirements, or performance parameter variations within acceptable operating ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	25	V
Current - Collector (Ic) (Max)	3	A
Power - Max	2	W
Frequency - Transition	150	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FZT649 are classified into two categories based on electrical parameter alignment:

Direct Equivalents maintain identical maximum collector current (3 A) and collector-emitter breakdown voltage (25 V) specifications. These parts satisfy pin-compatible and functionally equivalent requirements with potential variations in transition frequency and packaging format.

Similar Alternatives provide enhanced performance characteristics in specific parameters while maintaining compatibility with the primary voltage and current ratings. These parts accommodate applications requiring higher current capacity, improved saturation characteristics, or enhanced frequency response, provided circuit design accommodates the parameter differences.

Substitution eligibility is determined by the following criteria:

Transistor type remains NPN
Collector-emitter breakdown voltage equal to or greater than 25 V
Maximum collector current equal to or greater than 3 A
Maximum power dissipation equal to or greater than 2 W
Operating temperature range encompasses -55°C to 150°C
Surface mount package compatibility with TO-261-4 or TO-261AA footprint
RoHS3 compliance maintained
Active product status

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [W]	Frequency - Transition [MHz]	Package	Packaging Format	Product Status
FZT649	onsemi	3	25	2	150	SOT-223-4	Cut Tape (CT) & Digi-Reel®	Active
FZT649TA	Diodes Incorporated	3	25	2	240	SOT-223-3	Cut Tape (CT) & Digi-Reel®	Active
FZT649TC	Diodes Incorporated	3	25	2	240	SOT-223-3	Tape & Reel (TR)	Active
FZT1049ATA	Diodes Incorporated	5	25	2.5	180	SOT-223-3	Cut Tape (CT)	Active
FZT1049ATC	Diodes Incorporated	5	25	2.5	180	SOT-223-3	Tape & Reel (TR)	Active
FZT689BTA	Diodes Incorporated	3	20	2	150	SOT-223-3	Cut Tape (CT)	Active
FZT869TA	Diodes Incorporated	7	25	3	100	SOT-223-3	Cut Tape (CT)	Active
PBSS303NZ,135	Nexperia USA Inc.	5.5	30	2	130	SOT-223	Tape & Reel (TR)	Active

Engineering Selection Recommendations

Direct Equivalent Selection (FZT649TA, FZT649TC)

The FZT649TA and FZT649TC maintain identical electrical specifications to the FZT649 with respect to maximum collector current (3 A) and collector-emitter breakdown voltage (25 V). Both parts are manufactured by Diodes Incorporated and carry Active product status with RoHS3 compliance. The primary distinction between these parts is packaging format: FZT649TA is supplied in Cut Tape format, while FZT649TC is supplied in Tape & Reel format. Selection between these variants depends on procurement and assembly requirements. The transition frequency of 240 MHz in both variants exceeds the FZT649 specification of 150 MHz, providing enhanced high-frequency performance without compromising circuit compatibility.

Enhanced Current Capacity Selection (FZT1049ATA, FZT1049ATC)

The FZT1049ATA and FZT1049ATC provide increased maximum collector current of 5 A compared to the FZT649 specification of 3 A, while maintaining the same 25 V collector-emitter breakdown voltage. Maximum power dissipation increases to 2.5 W. These parts are suitable for applications requiring higher current handling capability within the same voltage class. Both variants maintain Active product status and RoHS3 compliance. FZT1049ATA is supplied in Cut Tape format, while FZT1049ATC is supplied in Tape & Reel format.

Enhanced Current and Power Selection (FZT869TA)

The FZT869TA provides maximum collector current of 7 A and maximum power dissipation of 3 W, both exceeding FZT649 specifications while maintaining 25 V collector-emitter breakdown voltage. This part is suitable for high-current switching applications. The transition frequency of 100 MHz is lower than the FZT649 specification, indicating reduced high-frequency performance. FZT869TA maintains Active product status and RoHS3 compliance.

Voltage-Enhanced Selection (PBSS303NZ,135)

The PBSS303NZ,135 manufactured by Nexperia USA Inc. provides 30 V collector-emitter breakdown voltage, exceeding the FZT649 specification of 25 V, with maximum collector current of 5.5 A and maximum power dissipation of 2 W. This part is qualified to AEC-Q100 automotive standards and carries Active product status with RoHS3 compliance. Selection of this part is appropriate for applications requiring enhanced voltage margin or automotive-grade qualification.

Voltage-Constrained Selection (FZT689BTA)

The FZT689BTA provides identical maximum collector current (3 A) and power dissipation (2 W) to the FZT649 but with reduced collector-emitter breakdown voltage of 20 V. This part is not suitable as a direct substitute for applications requiring the full 25 V rating. Selection of FZT689BTA is limited to circuits designed for 20 V operation or lower.

Frequently Asked Questions (FAQ)

Q: Can FZT649TA be used as a direct replacement for FZT649?

A: Yes. FZT649TA maintains identical maximum collector current (3 A) and collector-emitter breakdown voltage (25 V) specifications. The primary difference is the package variant: FZT649TA uses SOT-223-3 pinout while FZT649 uses SOT-223-4. Verify PCB footprint compatibility before substitution. FZT649TA provides higher transition frequency (240 MHz versus 150 MHz), which does not compromise circuit operation.

Q: What is the difference between FZT649TA and FZT649TC?

A: Both parts are electrically identical with 3 A maximum collector current and 25 V breakdown voltage. The distinction is packaging format: FZT649TA is supplied in Cut Tape (CT) & Digi-Reel® format, while FZT649TC is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment and procurement requirements.

Q: Can FZT1049ATA replace FZT649 in all applications?

A: FZT1049ATA provides higher maximum collector current (5 A versus 3 A) and higher power dissipation (2.5 W versus 2 W) while maintaining 25 V breakdown voltage. This part is suitable for applications where the FZT649 operates below its maximum current rating. Applications designed specifically for 3 A operation do not require the enhanced current capacity of FZT1049ATA.

Q: Is PBSS303NZ,135 compatible with FZT649 circuits?

A: PBSS303NZ,135 provides higher collector-emitter breakdown voltage (30 V versus 25 V) and higher maximum collector current (5.5 A versus 3 A). The part is compatible with FZT649 circuits from a voltage and current perspective. PBSS303NZ,135 carries AEC-Q100 automotive qualification, making it suitable for automotive applications. Verify SOT-223 pinout compatibility with circuit design.

Q: Why is FZT689BTA not recommended as a substitute?

A: FZT689BTA has a reduced collector-emitter breakdown voltage of 20 V compared to FZT649 specification of 25 V. This part is not suitable for applications requiring the full 25 V rating. FZT689BTA is appropriate only for circuits designed for 20 V operation or lower.

Q: What is the significance of transition frequency differences among substitute parts?

A: Transition frequency indicates the maximum frequency at which the transistor maintains useful gain. FZT649TA and FZT649TC provide 240 MHz (higher than FZT649's 150 MHz), suitable for higher-frequency applications. FZT869TA provides 100 MHz (lower than FZT649), suitable for lower-frequency applications. Selection depends on circuit frequency requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance status, consistent with FZT649 compliance. All parts carry unlimited moisture sensitivity rating (MSL 1).

Q: What packaging considerations apply when selecting substitutes?

A: FZT649 uses SOT-223-4 package. Most substitutes use SOT-223-3 package, which has different pinout. Verify PCB footprint compatibility before substitution. Packaging format (Cut Tape versus Tape & Reel) affects procurement and assembly processes but does not impact electrical performance.

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