FMMT718TC PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The FMMT718TC is an active-status PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This component operates at 20 V collector-emitter breakdown voltage with a maximum collector current of 1.5 A and 625 mW power dissipation. The transistor is specified for operating temperatures from -55°C to 150°C and achieves 180 MHz transition frequency with low saturation voltage characteristics.

Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters and mechanical compatibility within the SOT-23-3 package family. Substitutes enable design flexibility across different manufacturers, packaging formats, and automotive qualification levels while maintaining functional equivalence in circuit applications.

Key Parameters

Parameter	FMMT718TC Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1.5	A
Voltage - Collector Emitter Breakdown (Max)	20	V
Vce Saturation (Max)	220	mV @ 50mA, 1.5A
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min	300	@ 100mA, 2V
Power - Max	625	mW
Frequency - Transition	180	MHz
Operating Temperature	-55 to 150	°C (TJ)
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the FMMT718TC is based on the following critical parameters:

Electrical Equivalence Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must be 20 V or greater
Maximum collector current must be 1.5 A or greater
Package must be SOT-23-3 or compatible variant (TO-236-3, SC-59)
Operating temperature range must encompass -55°C to 150°C or higher
RoHS3 compliance required

Substitute Categories:

Parametric Equivalents (Diodes Incorporated): FMMT718TA and FMMT718QTA match all electrical specifications and package requirements. These parts are functionally interchangeable with FMMT718TC, differing only in packaging format (Cut Tape vs. Tape & Reel) or automotive qualification level.

Manufacturer Recommended Substitutes (Nexperia USA Inc.): PBSS4021PT,215, PBSS5120T,215, and PBSS5320T,215 provide alternative sourcing from a different manufacturer. These parts meet or exceed the core electrical requirements (20 V breakdown, PNP type, SOT-23-3 package family) while offering variations in collector current rating and power dissipation. All Nexperia substitutes carry automotive-grade qualification (AEC-Q100 or AEC-Q101).

Parameter Comparison

Parameter	FMMT718TC	FMMT718TA	FMMT718QTA	PBSS4021PT,215	PBSS5120T,215	PBSS5320T,215
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Nexperia USA	Nexperia USA	Nexperia USA
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max) [A]	1.5	1.5	1.5	3.5	1.0	2.0
Vce Breakdown (Max) [V]	20	20	20	20	20	20
Vce Saturation (Max) [mV]	220 @ 50mA, 1.5A	220 @ 50mA, 1.5A	220 @ 50mA, 1.5A	330 @ 400mA, 4A	250 @ 50mA, 1A	300 @ 300mA, 3A
Icbo (Max) [nA]	100	100	100	100	100	100
hFE (Min)	300 @ 100mA, 2V	300 @ 100mA, 2V	300 @ 100mA, 2V	140 @ 2A, 2V	250 @ 500mA, 2V	200 @ 1A, 2V
Power (Max) [mW]	625	625	625	1100	480	540
Frequency - Transition [MHz]	180	180	180	155	100	100
Operating Temperature [°C]	-55 to 150	-55 to 150	-55 to 150	to 150	to 150	to 150
Package	SOT-23-3	SOT-23-3	SOT-23 (Type DN)	TO-236AB	TO-236AB	TO-236AB
Packaging Format	Tape & Reel	Cut Tape & Digi-Reel	Tape & Reel	Cut Tape & Digi-Reel	Tape & Reel	Tape & Reel
Automotive Grade	—	—	AEC-Q101	AEC-Q100	AEC-Q100	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents:

FMMT718TA and FMMT718QTA are functionally identical to FMMT718TC across all electrical specifications. Selection between these three Diodes Incorporated parts depends on packaging and supply chain requirements. FMMT718TA is supplied in Cut Tape & Digi-Reel format, while FMMT718TC and FMMT718QTA are supplied in Tape & Reel format. FMMT718QTA carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring formal qualification documentation.

Nexperia Manufacturer Alternatives:

The Nexperia PBSS series transistors provide cross-manufacturer substitution with automotive-grade qualification (AEC-Q100). These parts maintain the 20 V collector-emitter breakdown voltage and SOT-23-3 package compatibility required for mechanical and electrical interchangeability.

PBSS4021PT,215 offers increased collector current capability (3.5 A) and power dissipation (1.1 W), suitable for applications requiring higher current handling than the FMMT718TC specification. This part is qualified to AEC-Q100 automotive standard.

PBSS5120T,215 provides a lower-current alternative (1.0 A maximum) with reduced power dissipation (480 mW) and lower transition frequency (100 MHz). This part is qualified to AEC-Q100 and is suitable for applications where the full 1.5 A capability of FMMT718TC is not required.

PBSS5320T,215 offers intermediate current capability (2.0 A) and power dissipation (540 mW) with 100 MHz transition frequency. This part provides a middle-ground option between PBSS5120T,215 and PBSS4021PT,215.

Selection Criteria:

For direct replacement without circuit modification, select FMMT718TA or FMMT718QTA. For automotive applications requiring formal qualification, select FMMT718QTA or any Nexperia PBSS part (all carry AEC-Q100 or AEC-Q101 qualification). For applications requiring higher current or power handling, select PBSS4021PT,215. For applications with reduced current requirements, select PBSS5120T,215. All substitutes maintain RoHS3 compliance and are active-status products with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can FMMT718TA be used as a direct replacement for FMMT718TC?

A: Yes. FMMT718TA is a parametric equivalent with identical electrical specifications (1.5 A collector current, 20 V breakdown voltage, 180 MHz transition frequency, 625 mW power dissipation). The only difference is packaging format: FMMT718TA is supplied in Cut Tape & Digi-Reel format while FMMT718TC is supplied in Tape & Reel format. Both use the SOT-23-3 package.

Q: What is the difference between FMMT718QTA and FMMT718TC?

A: FMMT718QTA and FMMT718TC are electrically identical with matching specifications. FMMT718QTA carries AEC-Q101 automotive qualification and is supplied in Tape & Reel format. FMMT718TC does not carry automotive qualification. Both use the SOT-23-3 package.

Q: Can Nexperia PBSS parts replace FMMT718TC in all applications?

A: Nexperia PBSS parts are mechanically and electrically compatible substitutes within the SOT-23-3 package family. However, electrical specifications vary by part number. PBSS4021PT,215 exceeds FMMT718TC specifications (3.5 A vs. 1.5 A collector current). PBSS5120T,215 is rated below FMMT718TC (1.0 A vs. 1.5 A). PBSS5320T,215 exceeds FMMT718TC (2.0 A vs. 1.5 A). Select the Nexperia part whose current rating matches or exceeds your circuit requirement.

Q: What is the difference between TO-236AB and SOT-23-3 packages?

A: TO-236AB and SOT-23-3 are equivalent package designations for the same physical form factor. Both refer to a three-lead surface mount package with identical pin configuration and dimensions. Parts specified as TO-236AB or SOT-23-3 are mechanically interchangeable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (FMMT718TA, FMMT718QTA, PBSS4021PT,215, PBSS5120T,215, PBSS5320T,215) are ROHS3 compliant.

Q: Which substitute part should I select for automotive applications?

A: For automotive applications, select FMMT718QTA (AEC-Q101 qualified), PBSS4021PT,215 (AEC-Q100 qualified), or PBSS5120T,215 (AEC-Q100 qualified). All three carry formal automotive qualification. PBSS5320T,215 does not carry automotive qualification documentation.

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

A: FMMT718TC, FMMT718TA, and FMMT718QTA operate from -55°C to 150°C. PBSS4021PT,215, PBSS5120T,215, and PBSS5320T,215 operate to 150°C maximum (lower temperature limit not specified in provided data). Verify lower temperature limit for PBSS parts if operation below 0°C is required.

Q: Can I use PBSS4021PT,215 in place of FMMT718TC if my circuit only requires 1.5 A?

A: Yes. PBSS4021PT,215 is rated for 3.5 A maximum collector current, which exceeds the 1.5 A requirement. The part is mechanically and electrically compatible. However, the higher current rating and increased power dissipation (1.1 W vs. 625 mW) may result in different thermal characteristics in your circuit. Verify thermal performance if heat dissipation is a design constraint.

Q: What inventory levels are available for each substitute part?

A: FMMT718TA has 26,100 units in stock. FMMT718QTA has 929 units in stock. PBSS4021PT,215 has 5,555 units in stock. PBSS5120T,215 has 3,734 units in stock. PBSS5320T,215 has 8,634 units in stock. Inventory levels are subject to change.

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