FMMTL717TC PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The FMMTL717TC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device operates at 12 V collector-emitter breakdown voltage with a maximum collector current of 1.25 A and 500 mW power dissipation. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts are selected based on electrical performance parameters, mechanical compatibility, and manufacturing status to ensure functional replacement in circuit applications.

Key Parameters

Parameter	FMMTL717TC	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	12	V
Current - Collector (Ic) (Max)	1.25	A
Power - Max	500	mW
Frequency - Transition	205	MHz
Vce Saturation (Max) @ Ib, Ic	290mV @ 50mA, 1.25A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 100mA, 2V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the FMMTL717TC are categorized based on electrical parameter compatibility and manufacturing status. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: PNP (required)
Package / Case: SOT-23-3 surface mount (required for mechanical compatibility)
Voltage - Collector Emitter Breakdown: minimum 12 V (equal or higher acceptable)
Current - Collector (Ic) (Max): minimum 1.25 A (equal or higher acceptable)
Power - Max: minimum 500 mW (equal or higher acceptable)
Operating Temperature Range: -55°C to 150°C (required)
RoHS3 Compliance: required

Substitution Categories:

Category 1: Direct Parametric Equivalents (Active Status) Parts with identical electrical specifications to the main part but with active product status and improved availability. These include FMMTL717TA and FMMTL717QTA from Diodes Incorporated.

Category 2: Enhanced Performance Substitutes (Active Status) Parts with higher current or power ratings while maintaining voltage compatibility and SOT-23-3 packaging. FMMT717TA provides 2.5 A maximum collector current with 625 mW power dissipation.

Category 3: Voltage-Rated Alternatives (Active Status) Parts with higher voltage ratings and SOT-23-3 packaging but reduced current or power specifications. These include MMBT2907ALT3G (60 V, 600 mA) and MMBT4403LT3G (40 V, 600 mA) from onsemi, and 2SB1590KT146Q from Rohm Semiconductor (15 V, 1 A).

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency	Package	Status	Vce Sat @ Ib, Ic
FMMTL717TC	Diodes Inc.	1.25 A	12 V	500 mW	205 MHz	SOT-23-3	Obsolete	290mV @ 50mA, 1.25A
FMMTL717TA	Diodes Inc.	1.25 A	12 V	500 mW	205 MHz	SOT-23-3	Active	290mV @ 50mA, 1.25A
FMMTL717QTA	Diodes Inc.	1.25 A	12 V	500 mW	205 MHz	SOT-23-3	Active	290mV @ 50mA, 1.25A
FMMT717TA	Diodes Inc.	2.5 A	12 V	625 mW	110 MHz	SOT-23-3	Active	220mV @ 50mA, 2.5A
2SB1590KT146Q	Rohm Semi.	1 A	15 V	200 mW	200 MHz	SOT-23-3	Active	300mV @ 20mA, 400mA
MMBT2907ALT3G	onsemi	600 mA	60 V	300 mW	200 MHz	SOT-23-3	Active	1.6V @ 50mA, 500mA
MMBT4403LT3G	onsemi	600 mA	40 V	300 mW	200 MHz	SOT-23-3	Active	750mV @ 50mA, 500mA

Engineering Selection Recommendations

Primary Recommendation: FMMTL717TA

FMMTL717TA is the preferred direct substitute for FMMTL717TC. This part is manufactured by Diodes Incorporated with identical electrical specifications, active product status, and high inventory availability (56,100 units). The part maintains the same voltage rating (12 V), collector current (1.25 A), power dissipation (500 mW), transition frequency (205 MHz), and saturation characteristics. FMMTL717TA is RoHS3 compliant and carries REACH Unaffected status, matching the compliance profile of the original part.

Secondary Recommendation: FMMTL717QTA

FMMTL717QTA provides identical electrical performance to FMMTL717TC with active status and automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive-level reliability and traceability. Inventory availability is 1,054 units.

Alternative Recommendation: FMMT717TA

FMMT717TA is an enhanced-performance substitute from Diodes Incorporated, offering doubled maximum collector current (2.5 A) and increased power dissipation (625 mW) while maintaining the 12 V voltage rating and SOT-23-3 package. This part is suitable for applications requiring higher current capacity. Transition frequency is reduced to 110 MHz. Inventory availability is 35,381 units.

Voltage-Rated Alternatives:

For applications requiring higher voltage tolerance, MMBT2907ALT3G (60 V, 600 mA) and MMBT4403LT3G (40 V, 600 mA) from onsemi provide SOT-23-3 packaging with reduced current and power specifications. These parts are suitable only when circuit requirements permit lower current handling and higher voltage operation.

The 2SB1590KT146Q from Rohm Semiconductor (15 V, 1 A) is suitable for applications requiring 15 V voltage rating with reduced power dissipation (200 mW).

Frequently Asked Questions (FAQ)

Q: Can FMMTL717TA directly replace FMMTL717TC without circuit modification?

A: Yes. FMMTL717TA is a direct parametric equivalent with identical voltage, current, power, and frequency specifications. The part operates within the same temperature range and uses the same SOT-23-3 package. No circuit modification is required.

Q: What is the difference between FMMTL717TA and FMMTL717QTA?

A: Both parts have identical electrical specifications. FMMTL717QTA carries automotive-grade qualification (AEC-Q101) and is suitable for automotive applications requiring enhanced reliability documentation. FMMTL717TA is the standard industrial-grade version. Packaging differs: FMMTL717QTA is supplied in Tape & Reel format, while FMMTL717TA is available in both Cut Tape and Tape & Reel formats.

Q: When should FMMT717TA be used instead of FMMTL717TA?

A: FMMT717TA is selected when the circuit requires higher collector current capacity (2.5 A versus 1.25 A) or increased power dissipation (625 mW versus 500 mW). The 12 V voltage rating remains identical. Transition frequency is lower (110 MHz versus 205 MHz), which may affect high-frequency applications. Circuit validation is required to confirm suitability.

Q: Are MMBT2907ALT3G and MMBT4403LT3G suitable substitutes?

A: These parts are not direct substitutes. While they share the SOT-23-3 package and PNP type, they have significantly reduced maximum collector current (600 mA versus 1.25 A) and power dissipation (300 mW versus 500 mW). They are suitable only for applications with lower current requirements. MMBT2907ALT3G offers higher voltage rating (60 V), while MMBT4403LT3G offers 40 V rating.

Q: Is the SOT-23-3 package identical across all substitute parts?

A: Yes. All substitute parts listed use the SOT-23-3 package (also designated TO-236-3 or SC-59). Physical dimensions and pin configurations are identical, allowing direct board-level substitution without layout modification.

Q: What is the significance of the "Tape & Reel" versus "Cut Tape" packaging designation?

A: Tape & Reel (TR) and Cut Tape (CT) refer to supply format only, not electrical or physical specifications. Tape & Reel is used for automated assembly processes with higher volume requirements. Cut Tape is used for lower-volume or manual assembly. The component itself is identical; only the delivery format differs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance and REACH Unaffected status, matching the environmental compliance profile of FMMTL717TC.

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

A: FMMTL717TA, FMMTL717QTA, FMMT717TA, MMBT2907ALT3G, and MMBT4403LT3G all operate from -55°C to 150°C (TJ). The 2SB1590KT146Q operates to 150°C maximum. All parts meet or exceed the original FMMTL717TC temperature specification.

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