FMMT617TC Equivalent & Substitute Parts

Part Overview

The FMMT617TC is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This Surface Mount device operates at 15 V collector-emitter breakdown voltage with a maximum collector current of 3 A and power dissipation of 625 mW. The part is currently in active production status with 30,400 units in stock.

Substitute parts are identified when design requirements permit relaxation of specific electrical parameters while maintaining functional compatibility within the application circuit. Substitution becomes necessary due to component availability, supply chain considerations, or packaging format preferences.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	15	V
Current - Collector (Ic) (Max)	3	A
Power - Max	625	mW
Frequency - Transition	120	MHz
Vce Saturation (Max) @ Ib, Ic	200mV @ 50mA, 3A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 200mA, 2V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution logic for the FMMT617TC is based on the following criteria:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 15 V collector-emitter breakdown voltage, 3 A maximum collector current, 625 mW power dissipation, 120 MHz transition frequency, and matching saturation characteristics. These parts differ only in packaging format (Cut Tape vs. Tape & Reel).

Functional Substitutes operate within relaxed parameter boundaries where the application circuit tolerates reduced current handling, voltage rating, or power dissipation. These substitutes maintain NPN polarity, Surface Mount SOT-23-3 package compatibility, and overlapping operating temperature ranges. Functional substitutes are selected when circuit design margins permit operation at lower absolute maximum ratings.

Key Parameters Determining Substitution:

Transistor polarity (NPN)
Package format (SOT-23-3 Surface Mount)
Operating temperature range overlap (-55°C to 150°C)
Collector-emitter breakdown voltage (minimum 15 V for direct equivalence)
Maximum collector current (minimum 3 A for direct equivalence)
Maximum power dissipation (minimum 625 mW for direct equivalence)

Parameter Comparison

Parameter	FMMT617TC	FMMT617TA	2SD1048-6-TB-E	MMBT2484LT1G	MMBT2484LT3G	MMBT6429LT1G	PMBT2369,215
Manufacturer	Diodes Inc.	Diodes Inc.	onsemi	onsemi	onsemi	onsemi	Nexperia USA Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	15 V	15 V	15 V	60 V	60 V	45 V	15 V
Current - Collector (Ic) (Max)	3 A	3 A	700 mA	100 mA	100 mA	200 mA	200 mA
Power - Max	625 mW	625 mW	200 mW	225 mW	225 mW	225 mW	250 mW
Frequency - Transition	120 MHz	120 MHz	250 MHz	—	—	700 MHz	500 MHz
Vce Saturation (Max) @ Ib, Ic	200mV @ 50mA, 3A	200mV @ 50mA, 3A	80mV @ 10mA, 100mA	350mV @ 100µA, 1mA	350mV @ 100µA, 1mA	600mV @ 5mA, 100mA	250mV @ 1mA, 10mA
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 200mA, 2V	300 @ 200mA, 2V	200 @ 50mA, 2V	250 @ 1mA, 5V	250 @ 1mA, 5V	500 @ 100µA, 5V	40 @ 10mA, 1V
Operating Temperature Range	-55 to 150°C	-55 to 150°C	to 125°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	to 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

FMMT617TA is a parametric equivalent to FMMT617TC. Both parts are manufactured by Diodes Incorporated with identical electrical specifications. The only difference is packaging format: FMMT617TA is supplied in Cut Tape and Digi-Reel format, while FMMT617TC is supplied in Tape & Reel format. Selection between these two depends on assembly line equipment compatibility and tape reel specifications. Both parts maintain ROHS3 compliance, MSL Level 1 rating, and active production status.

2SD1048-6-TB-E (onsemi) is a functional substitute suitable for applications where collector current requirements do not exceed 700 mA. This part maintains the 15 V collector-emitter breakdown voltage specification and operates within the same temperature range. The reduced maximum collector current (700 mA vs. 3 A) and power dissipation (200 mW vs. 625 mW) restrict its use to lower-power circuit implementations. The higher transition frequency (250 MHz vs. 120 MHz) provides additional performance margin in switching applications. ROHS3 compliance and MSL Level 1 rating are maintained.

MMBT2484LT1G and MMBT2484LT3G (onsemi) are functional substitutes for applications operating at collector currents not exceeding 100 mA. These parts feature higher collector-emitter breakdown voltage (60 V vs. 15 V), which provides overvoltage protection margin. The reduced power dissipation (225 mW vs. 625 mW) and collector current rating restrict application to low-power signal switching circuits. Both variants maintain identical electrical specifications and differ only in packaging format (Cut Tape vs. Tape & Reel). ROHS3 compliance and MSL Level 1 rating are maintained.

MMBT6429LT1G (onsemi) is a functional substitute for applications requiring collector currents up to 200 mA. This part maintains 45 V collector-emitter breakdown voltage and 225 mW power dissipation. The significantly higher transition frequency (700 MHz vs. 120 MHz) supports high-speed switching applications. The higher DC current gain (500 @ 100µA, 5V vs. 300 @ 200mA, 2V) provides improved base drive efficiency. ROHS3 compliance and MSL Level 1 rating are maintained.

PMBT2369,215 (Nexperia USA Inc.) is a functional substitute for applications operating at collector currents not exceeding 200 mA. This part maintains the 15 V collector-emitter breakdown voltage and operates within the same temperature range. The higher transition frequency (500 MHz vs. 120 MHz) supports faster switching applications. This part carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. ROHS3 compliance and MSL Level 1 rating are maintained.

All substitute parts maintain Surface Mount SOT-23-3 package compatibility, enabling direct footprint substitution on printed circuit boards. All parts are in active production status with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can FMMT617TA be used as a direct replacement for FMMT617TC?

A: Yes. FMMT617TA is a parametric equivalent with identical electrical specifications. The parts differ only in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel). Direct substitution is valid when assembly equipment supports the alternative tape format.

Q: What is the primary limitation when substituting MMBT2484LT1G or MMBT2484LT3G for FMMT617TC?

A: The maximum collector current is reduced from 3 A to 100 mA. These substitutes are suitable only for applications where circuit design operates at collector currents not exceeding 100 mA. The higher collector-emitter breakdown voltage (60 V vs. 15 V) provides additional voltage margin but does not compensate for reduced current capacity.

Q: Can 2SD1048-6-TB-E replace FMMT617TC in all applications?

A: No. The 2SD1048-6-TB-E has a maximum collector current of 700 mA and maximum power dissipation of 200 mW, compared to 3 A and 625 mW for FMMT617TC. Substitution is valid only when circuit design operates within these reduced ratings. The 15 V collector-emitter breakdown voltage matches the original specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the original FMMT617TC specification.

Q: What is the difference between MMBT2484LT1G and MMBT2484LT3G?

A: These parts have identical electrical specifications. The difference is packaging format: MMBT2484LT1G is supplied in Cut Tape & Digi-Reel format, while MMBT2484LT3G is supplied in Tape & Reel format. Selection depends on assembly line equipment compatibility.

Q: Does PMBT2369,215 offer any advantages over FMMT617TC?

A: PMBT2369,215 features a higher transition frequency (500 MHz vs. 120 MHz), supporting faster switching applications. It also carries AEC-Q101 automotive qualification, making it suitable for automotive-grade circuit implementations. However, the maximum collector current is reduced to 200 mA, limiting its use to lower-power applications.

Q: Can MMBT6429LT1G be used in high-frequency switching applications?

A: Yes. MMBT6429LT1G features a transition frequency of 700 MHz, significantly higher than FMMT617TC (120 MHz). This makes it suitable for high-frequency switching circuits. However, the maximum collector current is limited to 200 mA, restricting its use to lower-power implementations.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All substitute parts use the SOT-23-3 (TO-236-3, SC-59) Surface Mount package, enabling direct footprint compatibility on printed circuit boards.

Q: What is the operating temperature range for all listed parts?

A: FMMT617TC, FMMT617TA, MMBT2484LT1G, MMBT2484LT3G, and MMBT6429LT1G operate from -55°C to 150°C. The 2SD1048-6-TB-E operates to 125°C maximum. PMBT2369,215 operates to 150°C maximum. Verify application temperature requirements before substitution.

Q: Do all substitute parts have MSL Level 1 moisture sensitivity rating?

A: Yes. All listed substitute parts maintain MSL Level 1 (Unlimited) rating, matching the original FMMT617TC specification.

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