FMMT720TC PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The FMMT720TC 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 40V collector-emitter breakdown voltage with a maximum collector current of 1.5A and transition frequency of 190MHz. The FMMT720TC is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while offering active product status and continued availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	1.5	A
Collector-Emitter Breakdown Voltage (Max)	40	V
Power Dissipation (Max)	625	mW
Transition Frequency	190	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	—

Substitute Part Grouping Explanation

Substitute parts for the FMMT720TC are categorized based on electrical parameter compatibility and product status. The primary substitution criterion is the ability to handle the specified collector current (1.5A maximum) and collector-emitter breakdown voltage (40V minimum). Secondary criteria include transition frequency, power dissipation capability, and package compatibility.

Direct Parametric Equivalent (Identical Specifications): Parts matching all critical electrical parameters with active product status enable direct replacement without circuit redesign.

Functional Equivalent (Reduced Current Rating): Parts with lower maximum collector current (100mA to 500mA) but equivalent or higher breakdown voltage and compatible packages function as substitutes in applications where the full 1.5A rating is not required. These parts maintain PNP polarity, surface mount packaging, and SOT-23-3 form factor.

Functional Equivalent (Reduced Voltage Rating): Parts with lower collector-emitter breakdown voltage (30V) but matching 1.5A current rating serve as substitutes in applications operating below the voltage threshold.

Key Parameters Determining Substitution:

Transistor polarity (PNP)
Maximum collector current (≥ application requirement)
Collector-emitter breakdown voltage (≥ application requirement)
Package type (SOT-23-3 compatible)
Surface mount configuration
Operating temperature range coverage

Parameter Comparison

Manufacturer Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [mW]	Frequency [MHz]	Package	Product Status
FMMT720TC	Diodes Incorporated	1.5	40	625	190	SOT-23-3	Obsolete
FMMT720TA	Diodes Incorporated	1.5	40	625	190	SOT-23-3	Active
2PB709ARL,215	Nexperia USA Inc.	0.1	45	250	70	TO-236AB	Active
2PB709ART,235	Nexperia USA Inc.	0.1	45	250	70	TO-236AB	Active
2PB709ASL,215	Nexperia USA Inc.	0.1	45	250	80	TO-236AB	Active
2STR2230	STMicroelectronics	1.5	30	500	100	SOT-23-3	Active
BC807,215	Nexperia USA Inc.	0.5	45	250	80	TO-236AB	Active
BC807-16,215	Nexperia USA Inc.	0.5	45	250	80	TO-236AB	Active
BC807-16LT1G	onsemi	0.5	45	300	100	SOT-23-3	Active
BC807-16LT3G	onsemi	0.5	45	300	100	SOT-23-3	Active
BC807-25,215	Nexperia USA Inc.	0.5	45	250	80	TO-236AB	Active

Engineering Selection Recommendations

Primary Recommendation: FMMT720TA

The FMMT720TA from Diodes Incorporated is the direct parametric equivalent to the obsolete FMMT720TC. This part maintains identical electrical specifications: 1.5A maximum collector current, 40V collector-emitter breakdown voltage, 625mW power dissipation, and 190MHz transition frequency. The FMMT720TA is classified as active with substantial inventory availability (105,300 pieces), ensuring supply continuity. Both parts share the same base product number (FMMT720) and are packaged in SOT-23-3 surface mount configuration. RoHS3 compliance and MSL-1 moisture sensitivity rating are identical. This substitution requires no circuit modification and provides the highest compatibility assurance.

Secondary Recommendation for Current-Limited Applications: BC807-16LT1G or BC807-16LT3G

For applications where collector current requirements do not exceed 500mA, the BC807-16LT1G (onsemi, Cut Tape packaging) or BC807-16LT3G (onsemi, Tape & Reel packaging) provide active alternatives. Both devices maintain 45V collector-emitter breakdown voltage (exceeding the 40V requirement), operate in the SOT-23-3 package matching the original form factor, and feature 100MHz transition frequency with 300mW power dissipation. These parts are active with high inventory levels (146,930 and 30,400 pieces respectively) and support the full operating temperature range (-55°C to 150°C). Selection between LT1G and LT3G variants depends on packaging requirements: LT1G is supplied in Cut Tape & Digi-Reel format, while LT3G is supplied in Tape & Reel format.

Alternative for Voltage-Constrained Applications: 2STR2230

The 2STR2230 from STMicroelectronics serves applications operating at or below 30V collector-emitter voltage. This device maintains the 1.5A collector current rating and SOT-23-3 package configuration, with active product status and 209,400 pieces in inventory. The 100MHz transition frequency and 500mW power dissipation are suitable for lower-frequency switching applications. Operating temperature range extends to -65°C minimum, providing enhanced low-temperature performance.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance, MSL-1 moisture sensitivity rating, and EAR99 export classification. The 2PB709 series (Nexperia) and BC807 series (Nexperia, onsemi) carry AEC-Q101 automotive qualification, suitable for automotive-grade applications. Selection should account for specific application grade requirements.

Frequently Asked Questions (FAQ)

Q: Can FMMT720TA directly replace FMMT720TC without circuit modification?

A: Yes. The FMMT720TA is a direct parametric equivalent with identical electrical specifications, package type, and operating characteristics. No circuit redesign is required.

Q: What is the primary reason for substituting the FMMT720TC?

A: The FMMT720TC is classified as obsolete. The FMMT720TA provides the same functionality with active product status and assured long-term availability.

Q: Can BC807-16LT1G replace FMMT720TC in all applications?

A: No. The BC807-16LT1G has a maximum collector current of 500mA, compared to the FMMT720TC's 1.5A rating. This substitute is suitable only for applications where collector current does not exceed 500mA. Verify application current requirements before substitution.

Q: What is the difference between BC807-16LT1G and BC807-16LT3G?

A: Both parts are electrically identical with 500mA collector current, 45V breakdown voltage, and SOT-23-3 packaging. The primary difference is packaging format: LT1G is supplied in Cut Tape & Digi-Reel format, while LT3G is supplied in Tape & Reel format. Selection depends on assembly line requirements.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All recommended substitute parts maintain ROHS3 compliance and MSL-1 moisture sensitivity rating, matching the original FMMT720TC specifications.

Q: Can 2STR2230 replace FMMT720TC in high-voltage applications?

A: No. The 2STR2230 has a maximum collector-emitter breakdown voltage of 30V, compared to the FMMT720TC's 40V rating. This substitute is suitable only for applications operating at or below 30V. Do not use in circuits requiring 40V breakdown voltage capability.

Q: What packaging options are available for BC807 variants?

A: BC807 variants are available in two package formats: TO-236AB (Nexperia series) and SOT-23-3 (onsemi series). Both are surface mount configurations compatible with standard PCB assembly processes. Verify your assembly equipment compatibility before selection.

Q: Do the 2PB709 series parts meet automotive qualification requirements?

A: Yes. The 2PB709ARL,215, 2PB709ART,235, and 2PB709ASL,215 variants carry AEC-Q101 automotive qualification and are suitable for automotive-grade applications. However, these parts have reduced collector current (100mA maximum) and are suitable only for low-current signal switching applications.

Q: What is the operating temperature range for all recommended substitutes?

A: FMMT720TA, BC807-16LT1G, and BC807-16LT3G support -55°C to 150°C. The 2STR2230 extends the minimum temperature to -65°C. The 2PB709 series and Nexperia BC807 variants are rated to 150°C maximum only. Verify application temperature requirements for proper selection.

Q: Are there inventory concerns with any recommended substitutes?

A: FMMT720TA has the highest inventory (105,300 pieces). BC807-16LT1G (146,930 pieces) and 2STR2230 (209,400 pieces) also have substantial stock. BC807-25,215 has lower inventory (2,320 pieces). Verify current availability with your supplier for production planning.

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