FMMTL720TC Equivalent & Substitute Parts

Part Overview

The FMMTL720TC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 40 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers 500 mW maximum power dissipation and operates across the temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Maximum Collector Current (Ic)	1	A
Collector-Emitter Breakdown Voltage (Max)	40	V
Maximum Power Dissipation	500	mW
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	—

Substitute Part Grouping Explanation

Substitution of the FMMTL720TC is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor type must be PNP
Package must be SOT-23-3 (TO-236-3, SC-59) surface mount
Collector-emitter breakdown voltage must equal or exceed 40 V
Maximum collector current must equal or exceed 1 A
Maximum power dissipation must equal or exceed 500 mW
Operating temperature range must encompass -55°C to 150°C
RoHS3 compliance required

Substitution Logic: Substitute parts are grouped into two categories based on electrical performance relative to the FMMTL720TC:

Direct Voltage/Current Equivalents — Parts with 40 V breakdown voltage and current ratings at or above 1 A
Enhanced Performance Substitutes — Parts with higher voltage or current ratings that maintain full backward compatibility

All substitute parts listed maintain the same SOT-23-3 package footprint and surface mount configuration, ensuring mechanical and electrical compatibility without PCB redesign.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Temp Range	Product Status
FMMTL720TC	Diodes Incorporated	1 A	40 V	500 mW	-55 to 150°C	Obsolete
MMBT4403LT3G	onsemi	600 mA	40 V	300 mW	-55 to 150°C	Active
MMBT4403LT1G	onsemi	600 mA	40 V	300 mW	-55 to 150°C	Active
MMBT2907ALT3G	onsemi	600 mA	60 V	300 mW	-55 to 150°C	Active
MMBT2907ALT1G	onsemi	600 mA	60 V	300 mW	-55 to 150°C	Active
2SA1037AKT146R	Rohm Semiconductor	150 mA	50 V	200 mW	—	Active
2SA1037AKT146Q	Rohm Semiconductor	150 mA	50 V	200 mW	—	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

The MMBT4403LT3G and MMBT4403LT1G (onsemi) are the preferred substitutes for the FMMTL720TC. Both parts maintain the identical 40 V collector-emitter breakdown voltage and SOT-23-3 package configuration. These devices are in active production status with substantial inventory availability (46,872 and 824,300 units respectively). Both are ROHS3 compliant and operate across the full -55°C to 150°C temperature range. The primary design consideration is that these substitutes are rated for 600 mA maximum collector current and 300 mW power dissipation, which are lower than the original part's 1 A and 500 mW ratings. These substitutes are suitable for applications where the actual operating current does not exceed 600 mA.

Secondary Substitutes (Enhanced Performance):

The MMBT2907ALT3G and MMBT2907ALT1G (onsemi) provide enhanced voltage rating (60 V) while maintaining 600 mA current capability and the SOT-23-3 package. These parts are active production devices with high inventory levels (888,991 and 1,598,400 units respectively) and full temperature range support. These substitutes are appropriate for designs requiring higher voltage margin or where the application operates below 600 mA collector current.

Limited Current Applications:

The 2SA1037AKT146R and 2SA1037AKT146Q (Rohm Semiconductor) are active production alternatives with higher voltage ratings (50 V) but significantly reduced current capability (150 mA maximum). These parts are suitable only for low-current applications and are not recommended as general replacements for the FMMTL720TC.

Selection Basis: All recommended substitutes maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification. Product status prioritizes active production devices to ensure long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the MMBT4403LT3G directly replace the FMMTL720TC without circuit modification?

A: The MMBT4403LT3G is mechanically and electrically compatible with the FMMTL720TC in the SOT-23-3 package. However, the substitute is rated for 600 mA maximum collector current versus the original 1 A rating. Direct replacement is valid only if the circuit design operates the transistor at collector currents not exceeding 600 mA. If the original design requires 1 A operation, circuit redesign or alternative substitutes must be evaluated.

Q: What is the difference between MMBT4403LT1G and MMBT4403LT3G?

A: Both parts are electrically identical PNP transistors with 40 V breakdown voltage and 600 mA current rating. The primary difference is packaging: MMBT4403LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while MMBT4403LT3G is supplied in Tape & Reel (TR) format. Selection depends on production volume and assembly equipment compatibility.

Q: Why are the 2SA1037AKT146R and 2SA1037AKT146Q not recommended as primary substitutes?

A: These Rohm Semiconductor parts are rated for only 150 mA maximum collector current, which is significantly below the FMMTL720TC's 1 A rating. Additionally, their maximum power dissipation is 200 mW compared to the original 500 mW. These parts are suitable only for low-current applications and do not provide equivalent performance for general replacement purposes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, matching the compliance status of the original FMMTL720TC.

Q: What is the operating temperature range for the 2SA1037 series substitutes?

A: The operating temperature range for the 2SA1037AKT146R and 2SA1037AKT146Q is not specified in the provided data. The MMBT4403 and MMBT2907 series substitutes operate across -55°C to 150°C, matching the original FMMTL720TC specification.

Q: Can the MMBT2907ALT series be used in applications requiring 40 V operation?

A: Yes. The MMBT2907ALT3G and MMBT2907ALT1G are rated for 60 V collector-emitter breakdown voltage, which exceeds the 40 V requirement. These parts operate safely at 40 V and provide additional voltage margin. They are suitable for any application designed for the FMMTL720TC operating at or below 600 mA collector current.

Q: What inventory levels are available for the recommended substitutes?

A: MMBT4403LT3G: 46,872 units; MMBT4403LT1G: 824,300 units; MMBT2907ALT3G: 888,991 units; MMBT2907ALT1G: 1,598,400 units. The MMBT2907 series offers significantly higher inventory availability for high-volume production requirements.

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