FMMTA92TC Equivalent & Substitute Parts

Part Overview

The FMMTA92TC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 300 V collector-emitter breakdown voltage and 200 mA maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, indicating discontinuation from the manufacturer. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	200	mA
Vce Saturation (Max) @ Ib, Ic	500 mV @ 2 mA, 20 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 30 mA, 10 V	—
Power - Max	330	mW
Frequency - Transition	50	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—

Substitute Part Grouping Explanation

Substitution of the FMMTA92TC is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): ≥ 300 V
Current - Collector (Ic) (Max): ≥ 200 mA
Package / Case: SOT-23-3 compatible (TO-236-3, SC-59)
Mounting Type: Surface Mount

Secondary Compatibility Criteria:

Vce Saturation (Max) @ Ib, Ic: ≤ 500 mV @ 2 mA, 20 mA
DC Current Gain (hFE) (Min) @ Ic, Vce: ≥ 25 @ 30 mA, 10 V
Frequency - Transition: ≥ 50 MHz
Operating Temperature Range: Must encompass application requirements

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications to the FMMTA92TC, differing only in packaging format or product status.

Functional Substitutes: Parts with equal or superior electrical ratings that satisfy the mandatory compatibility criteria, allowing direct circuit replacement with no design modification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce (Max) V	Power (Max) mW	Frequency (Max) MHz	Package	Temp Range °C
FMMTA92TC	Diodes Incorporated	Obsolete	200	300	330	50	SOT-23-3	-55 to 150
FMMTA92TA	Diodes Incorporated	Active	200	300	330	50	SOT-23-3	-55 to 150
MMBTA92-7-F	Diodes Incorporated	Active	500	300	300	50	SOT-23-3	-55 to 150
MMBTA92,215	Nexperia USA Inc.	Active	100	300	250	50	SOT-23-3	-55 to 150
MMBTA92LT1G	onsemi	Active	500	300	300	50	SOT-23-3	-55 to 150
MMBTA92LT3G	onsemi	Active	500	300	300	50	SOT-23-3	-55 to 150
CMPTA92 TR	Central Semiconductor Corp	Active	500	300	350	50	SOT-23-3	-65 to 150
MSB92T1G	onsemi	Active	150	300	150	50	SC-59	-55 to 150
2SA1721RTE85LF	Toshiba Semiconductor and Storage	Active	100	300	150	50	SOT-23-3	-55 to 150
BF821,215	Nexperia USA Inc.	Active	50	300	250	60	SOT-23-3	-55 to 150
MMBT6520LT1G	onsemi	Active	500	350	225	200	SOT-23-3	-55 to 150

Engineering Selection Recommendations

Primary Recommendation: FMMTA92TA

The FMMTA92TA is the direct parametric equivalent to the FMMTA92TC. It maintains identical electrical specifications across all critical parameters: 200 mA maximum collector current, 300 V collector-emitter breakdown voltage, 330 mW power dissipation, and 50 MHz transition frequency. The device is manufactured by Diodes Incorporated and carries Active product status, ensuring long-term availability. The only difference is packaging format (Tape & Reel versus Cut Tape), which does not affect electrical performance. This part is suitable for direct replacement in all applications.

Secondary Recommendations for Current Capacity Upgrade:

When circuit design permits increased collector current handling, the following parts provide superior current ratings while maintaining 300 V voltage specification:

MMBTA92LT1G (onsemi): 500 mA maximum collector current, Active status, -55°C to 150°C operating range
MMBTA92LT3G (onsemi): 500 mA maximum collector current, Active status, -55°C to 150°C operating range
MMBTA92-7-F (Diodes Incorporated): 500 mA maximum collector current, Active status, AEC-Q101 automotive qualification
CMPTA92 TR (Central Semiconductor Corp): 500 mA maximum collector current, Active status, extended temperature range to -65°C

Recommendations for Current Capacity Reduction:

When circuit design requires lower collector current specifications:

MMBTA92,215 (Nexperia USA Inc.): 100 mA maximum collector current, Active status, AEC-Q101 automotive qualification
2SA1721RTE85LF (Toshiba): 100 mA maximum collector current, Active status
MSB92T1G (onsemi): 150 mA maximum collector current, Active status, SC-59 package variant

Recommendation for Enhanced Voltage Rating:

MMBT6520LT1G (onsemi): 350 V collector-emitter breakdown voltage, 500 mA collector current, 200 MHz transition frequency, Active status. This part exceeds the voltage specification of the FMMTA92TC and provides enhanced frequency performance.

Recommendation for Low Current Applications:

BF821,215 (Nexperia USA Inc.): 50 mA maximum collector current, 300 V voltage rating, 60 MHz transition frequency, Active status, AEC-Q101 automotive qualification

All recommended substitutes maintain SOT-23-3 package compatibility and surface mount mounting type. All parts listed carry RoHS3 compliance and MSL-1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can FMMTA92TA be used as a direct replacement for FMMTA92TC?

A: Yes. The FMMTA92TA is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel versus Cut Tape). Both parts are PNP transistors with 200 mA maximum collector current, 300 V breakdown voltage, and SOT-23-3 package compatibility. FMMTA92TA carries Active product status, ensuring availability.

Q: What is the difference between MMBTA92LT1G and MMBTA92LT3G?

A: Both parts are manufactured by onsemi and share identical electrical specifications: 500 mA maximum collector current, 300 V breakdown voltage, 50 MHz transition frequency, and SOT-23-3 package. The difference is packaging format: MMBTA92LT1G is supplied in Cut Tape & Digi-Reel format, while MMBTA92LT3G is supplied in Tape & Reel format. Electrical performance is identical.

Q: Can I use MMBT6520LT1G in place of FMMTA92TC?

A: Yes, with design considerations. The MMBT6520LT1G exceeds the FMMTA92TC specifications in three areas: 350 V breakdown voltage (versus 300 V), 500 mA collector current (versus 200 mA), and 200 MHz transition frequency (versus 50 MHz). The part is electrically superior and maintains SOT-23-3 package compatibility. However, the higher transition frequency and different saturation characteristics may affect circuit behavior in timing-sensitive applications.

Q: Why is MMBTA92,215 listed as a substitute if it has only 100 mA collector current?

A: MMBTA92,215 is a functional substitute for applications where the circuit design requires less than 100 mA collector current. It maintains the 300 V breakdown voltage, SOT-23-3 package compatibility, and identical saturation voltage characteristics. It is suitable for low-current switching applications and carries AEC-Q101 automotive qualification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance status, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard. Parts carrying this certification (MMBTA92-7-F, MMBTA92,215, and BF821,215) have undergone additional reliability testing and are approved for automotive applications. This qualification is optional for non-automotive applications but indicates enhanced quality assurance.

Q: Can I substitute based on package type alone?

A: No. Package type is a necessary but not sufficient condition for substitution. All electrical parameters must be verified: transistor type (PNP), breakdown voltage (≥ 300 V), collector current (≥ 200 mA for direct replacement), saturation voltage, current gain, and frequency response. Package compatibility ensures physical fit; electrical parameters ensure functional performance.

Q: What is the difference between SOT-23-3 and SC-59 packages?

A: SOT-23-3 and SC-59 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. MSB92T1G is listed with SC-59 designation but is physically compatible with SOT-23-3 footprints.

Q: Why is FMMTA92TC listed as obsolete?

A: Obsolete status indicates the manufacturer (Diodes Incorporated) has discontinued production. The FMMTA92TA, also from Diodes Incorporated, is the active replacement with identical specifications. Using active parts ensures long-term supply chain reliability and manufacturing support.

Q: Can I use a substitute part with lower collector current rating?

A: Only if your circuit design operates below the substitute part's maximum collector current specification. For example, if your application requires 150 mA or less, MSB92T1G (150 mA rating) is suitable. However, if your circuit requires 200 mA, you must select a substitute with ≥ 200 mA rating. Operating a transistor above its maximum collector current rating causes device failure.

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