FMMTL718TC PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The FMMTL718TC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device is rated for 20 V collector-emitter breakdown voltage and 1 A maximum collector current, with a maximum power dissipation of 500 mW and transition frequency of 265 MHz.

The FMMTL718TC is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and legacy system support.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	1	A
Collector-Emitter Breakdown Voltage (Max)	20	V
Vce Saturation (Max)	450 mV @ 100 mA, 1.5 A	—
DC Current Gain (hFE) Minimum	200 @ 500 mA, 2 V	—
Power Dissipation Maximum	500	mW
Transition Frequency	265	MHz
Operating Temperature Range	−55 to 150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FMMTL718TC is determined by the following critical parameters:

Mandatory Matching Criteria:

Transistor type: PNP
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Operating temperature range: −55°C to 150°C minimum
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Functional Compatibility Criteria:

Collector-emitter breakdown voltage ≥ 20 V
Maximum collector current ≥ 1 A
Maximum power dissipation ≥ 500 mW
Transition frequency ≥ 265 MHz
DC current gain (hFE) ≥ 200 at specified conditions

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and functional substitutes (meet or exceed all critical performance requirements while maintaining package and compliance standards).

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br) (Max)	Power (Max)	fT	hFE (Min)	Package	Status
FMMTL718TC	Diodes Incorporated	1 A	20 V	500 mW	265 MHz	200 @ 500 mA, 2 V	SOT-23-3	Obsolete
FMMTL718TA	Diodes Incorporated	1 A	20 V	500 mW	265 MHz	200 @ 500 mA, 2 V	SOT-23-3	Active
MMBT2907ALT1G	onsemi	600 mA	60 V	300 mW	200 MHz	100 @ 150 mA, 10 V	SOT-23-3	Active
MMBT2907ALT3G	onsemi	600 mA	60 V	300 mW	200 MHz	100 @ 150 mA, 10 V	SOT-23-3	Active
MMBT4403LT1G	onsemi	600 mA	40 V	300 mW	200 MHz	100 @ 150 mA, 2 V	SOT-23-3	Active
MMBT4403LT3G	onsemi	600 mA	40 V	300 mW	200 MHz	100 @ 150 mA, 2 V	SOT-23-3	Active
PBSS4021PT,215	Nexperia USA Inc.	3.5 A	20 V	1.1 W	155 MHz	140 @ 2 A, 2 V	SOT-23-3	Active
PBSS5320T,215	Nexperia USA Inc.	2 A	20 V	540 mW	100 MHz	200 @ 1 A, 2 V	SOT-23-3	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

FMMTL718TA is the direct parametric equivalent to FMMTL718TC. Both devices are manufactured by Diodes Incorporated with identical electrical specifications, operating temperature range, and package configuration. FMMTL718TA is active in production and available in high volume. This part is the primary recommendation for direct substitution.

Functional Substitutes (Performance Exceeds Requirements):

PBSS5320T,215 (Nexperia USA Inc.) meets the original specification with matched collector current (2 A exceeds 1 A requirement), identical collector-emitter breakdown voltage (20 V), and superior power dissipation (540 mW exceeds 500 mW requirement). DC current gain matches the original specification at 200 minimum. This part is AEC-Q100 qualified and suitable for automotive applications.

PBSS4021PT,215 (Nexperia USA Inc.) exceeds all electrical requirements with 3.5 A collector current, 20 V breakdown voltage, and 1.1 W power dissipation. This part is AEC-Q100 qualified and suitable for applications requiring higher current capacity.

Limited Compatibility Substitutes:

MMBT2907ALT1G, MMBT2907ALT3G, MMBT4403LT1G, and MMBT4403LT3G (onsemi) are functional substitutes with reduced maximum collector current (600 mA) and power dissipation (300 mW). These parts are suitable only for applications where the original 1 A current requirement can be reduced. All parts maintain SOT-23-3 packaging, RoHS3 compliance, and operating temperature range compatibility.

All substitute parts listed are RoHS3 compliant with moisture sensitivity level 1 (unlimited) and maintain the required operating temperature range of −55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can FMMTL718TA be used as a direct replacement for FMMTL718TC?

A: Yes. FMMTL718TA is the parametric equivalent with identical electrical specifications, package type (SOT-23-3), and operating characteristics. The primary difference is packaging format (Tape & Reel versus Cut Tape) and active production status.

Q: What is the difference between MMBT2907ALT1G and MMBT2907ALT3G?

A: Both parts are electrically identical. The difference is in packaging format: ALT1G is supplied in Cut Tape & Digi-Reel format, while ALT3G is supplied in Tape & Reel format. Electrical performance and SOT-23-3 package configuration are identical.

Q: Can MMBT4403LT1G replace FMMTL718TC in all applications?

A: MMBT4403LT1G is a functional substitute only for applications where maximum collector current can be reduced from 1 A to 600 mA. The part provides higher collector-emitter breakdown voltage (40 V versus 20 V) and maintains the SOT-23-3 package. Applications requiring the full 1 A current rating require PBSS5320T,215 or PBSS4021PT,215.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with moisture sensitivity level 1 (unlimited), matching the original FMMTL718TC compliance status.

Q: What is the advantage of PBSS4021PT,215 over PBSS5320T,215?

A: PBSS4021PT,215 provides higher maximum collector current (3.5 A versus 2 A) and higher power dissipation (1.1 W versus 540 mW). Both parts maintain 20 V collector-emitter breakdown voltage and SOT-23-3 packaging. Selection depends on application current requirements.

Q: Can onsemi MMBT series parts be used in automotive applications?

A: The onsemi MMBT2907 and MMBT4403 series parts listed are not AEC-Q100 qualified. For automotive applications, PBSS4021PT,215 and PBSS5320T,215 (Nexperia, AEC-Q100 qualified) are the appropriate selections.

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

A: All substitute parts maintain the operating temperature range of −55°C to 150°C (TJ), matching the original FMMTL718TC specification.

Q: Why is transition frequency lower in some substitute parts?

A: PBSS5320T,215 has a transition frequency of 100 MHz and PBSS4021PT,215 has 155 MHz, both lower than the original 265 MHz. These parts are suitable for applications where the lower frequency is acceptable. For applications requiring 265 MHz or higher transition frequency, FMMTL718TA is the appropriate selection.

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