FMMTA92TA Equivalent & Substitute Parts

Part Overview

The FMMTA92TA is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This active product operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 200 mA and 330 mW power dissipation. The device is specified for operating temperatures from -55°C to 150°C and achieves 50 MHz transition frequency.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining mechanical compatibility through the SOT-23-3 package format. Alternative sources and variants exist that satisfy the core functional requirements of this transistor category.

Key Parameters

Parameter	FMMTA92TA Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	200	mA
Power - Max	330	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 30mA, 10V	—

Substitute Part Grouping Explanation

Substitution logic for the FMMTA92TA is based on the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: PNP (required for circuit polarity)
Package / Case: SOT-23-3 (required for mechanical fit)
Voltage - Collector Emitter Breakdown (Max): 300 V minimum (required for voltage rating)
Mounting Type: Surface Mount (required for assembly compatibility)

Performance Parameters:

Current - Collector (Ic) (Max): 200 mA or greater (allows higher current capability)
Power - Max: 330 mW or greater (allows higher power dissipation)
Frequency - Transition: 50 MHz or greater (allows higher frequency operation)
Operating Temperature Range: Must include -55°C to 150°C or equivalent

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents: Parts with identical or superior electrical specifications across all critical parameters, maintaining the same voltage and frequency ratings.

Category B - Enhanced Performance Variants: Parts with higher current ratings, power dissipation, or frequency capability while maintaining voltage compatibility and package format.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	Freq MHz	Temp Range °C	Package	Grade
FMMTA92TA	Diodes Inc.	200	300	330	50	-55 to 150	SOT-23-3	Commercial
MMBTA92-7-F	Diodes Inc.	500	300	300	50	-55 to 150	SOT-23-3	Automotive
BF821,215	Nexperia USA	50	300	250	60	-55 to 150	SOT-23-3	Automotive
BF821,235	Nexperia USA	50	300	250	60	-55 to 150	SOT-23-3	Automotive
CMPTA92 TR	Central Semi.	500	300	350	50	-65 to 150	SOT-23-3	Commercial
MMBT6520LT1G	onsemi	500	350	225	200	-55 to 150	SOT-23-3	Commercial
MMBTA92,215	Nexperia USA	100	300	250	50	-55 to 150	SOT-23-3	Automotive
MMBTA92-AU_R1_000A1	Panjit Int.	500	300	250	50	-55 to 150	SOT-23-3	Automotive
MMBTA92-TP	Micro Comm.	300	300	300	50	-55 to 150	SOT-23-3	Commercial
MMBTA92LT1G	onsemi	500	300	300	50	-55 to 150	SOT-23-3	Commercial
MMBTA92LT3G	onsemi	500	300	300	50	-55 to 150	SOT-23-3	Commercial

Engineering Selection Recommendations

Direct Substitutes (Equivalent Performance):

The MMBTA92LT1G and MMBTA92LT3G from onsemi provide electrical equivalence to the FMMTA92TA with identical voltage, frequency, and power specifications. Both devices maintain the -55°C to 150°C operating range and SOT-23-3 package format. The primary distinction is packaging: MMBTA92LT1G is supplied in Cut Tape & Digi-Reel format, while MMBTA92LT3G is supplied in Tape & Reel format.

Enhanced Current Capability Substitutes:

The MMBTA92-7-F (Diodes Incorporated), CMPTA92 TR (Central Semiconductor), MMBTA92-AU_R1_000A1 (Panjit International), and MMBTA92LT1G/LT3G (onsemi) all support 500 mA maximum collector current, exceeding the FMMTA92TA specification of 200 mA. These parts maintain 300 V voltage rating and are suitable for applications requiring higher current handling within the same package envelope.

Automotive Grade Options:

The MMBTA92-7-F, BF821,215, BF821,235, and MMBTA92-AU_R1_000A1 carry automotive qualification (AEC-Q101). These parts are appropriate for applications requiring automotive-grade component certification.

Reduced Current Applications:

The BF821,215 and BF821,235 from Nexperia USA are specified for 50 mA maximum collector current. These parts are suitable for low-current applications and provide 60 MHz transition frequency with automotive qualification.

Enhanced Voltage Capability:

The MMBT6520LT1G from onsemi provides 350 V collector-emitter breakdown voltage, exceeding the 300 V specification of the FMMTA92TA. This device also features 200 MHz transition frequency and is suitable for higher-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can the MMBTA92LT1G replace the FMMTA92TA in all applications?

A: The MMBTA92LT1G is electrically equivalent to the FMMTA92TA across all critical parameters: 300 V breakdown voltage, 50 MHz transition frequency, and -55°C to 150°C operating range. Both use the SOT-23-3 package. Substitution is valid for applications within these specifications.

Q: What is the difference between MMBTA92LT1G and MMBTA92LT3G?

A: Both parts are electrically identical with 500 mA collector current, 300 V breakdown voltage, and 50 MHz transition frequency. The difference is packaging: MMBTA92LT1G is supplied in Cut Tape & Digi-Reel format, while MMBTA92LT3G is supplied in Tape & Reel format. Selection depends on assembly equipment compatibility.

Q: Why would I choose a higher current-rated part like MMBTA92-7-F over the FMMTA92TA?

A: The MMBTA92-7-F supports 500 mA collector current compared to the FMMTA92TA's 200 mA. If your circuit requires higher current capability or if you want design margin for future modifications, the higher-rated part provides this capability within the same package and voltage specification.

Q: Are the BF821 parts suitable substitutes?

A: The BF821,215 and BF821,235 maintain 300 V breakdown voltage and SOT-23-3 package compatibility. However, they are specified for 50 mA maximum collector current, which is lower than the FMMTA92TA's 200 mA. These parts are suitable only for applications requiring 50 mA or less.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive qualification standard. Parts carrying this designation (MMBTA92-7-F, BF821,215, BF821,235, MMBTA92-AU_R1_000A1) are qualified for automotive applications. Use these parts when automotive-grade certification is required by specification.

Q: Can I use MMBT6520LT1G as a substitute?

A: The MMBT6520LT1G is mechanically compatible (SOT-23-3 package) and provides superior voltage capability (350 V vs. 300 V) and frequency performance (200 MHz vs. 50 MHz). However, it has lower power dissipation (225 mW vs. 330 mW). Substitution is valid for applications that do not require the full 330 mW power rating.

Q: What is the significance of the operating temperature range?

A: The FMMTA92TA operates from -55°C to 150°C. Most substitute parts maintain this range. The CMPTA92 TR extends to -65°C minimum, providing wider low-temperature operation. The BF821 parts specify only 150°C maximum without a stated minimum, which may limit use in extreme cold environments.

Q: Does package format affect electrical performance?

A: No. Cut Tape & Digi-Reel and Tape & Reel formats are packaging and delivery methods only. Electrical performance is identical between parts with the same base part number but different packaging designations (e.g., MMBTA92LT1G vs. MMBTA92LT3G).

Q: Which substitute offers the best overall compatibility?

A: The MMBTA92LT1G and MMBTA92LT3G from onsemi provide complete electrical equivalence to the FMMTA92TA with identical specifications across all parameters. These parts are the most direct substitutes and require no design modifications.

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