MMBTA92LT3 Equivalent & Substitute Parts

Part Overview

The MMBTA92LT3 is a PNP bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. Active alternatives with identical or compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the MMBTA92LT3 is determined by strict equivalence across the following critical parameters: transistor polarity (PNP), collector-emitter breakdown voltage (300 V), maximum collector current rating, power dissipation capability, transition frequency, operating temperature range, and surface mount package compatibility (SOT-23-3 or equivalent footprint).

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents: Parts with identical electrical specifications and active product status from onsemi, differing only in packaging format (Tape & Reel versus Cut Tape).

Parametric Equivalents: Parts from onsemi with identical electrical specifications and active status, including automotive-grade variants with AEC-Q101 qualification.

Similar/Compatible Alternatives: Parts from alternative manufacturers (Nexperia, Diodes Incorporated, Micro Commercial Co) with comparable electrical performance within the same package family, suitable for applications where the primary electrical parameters are met.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) V	Power mW	Freq MHz	Temp °C	Package	RoHS	Automotive
MMBTA92LT3	onsemi	Obsolete	500	300	300	50	−55 to 150	SOT-23-3	Non-compliant	No
MMBTA92LT3G	onsemi	Active	500	300	300	50	−55 to 150	SOT-23-3	ROHS3	No
MMBTA92LT1G	onsemi	Active	500	300	300	50	−55 to 150	SOT-23-3	ROHS3	No
SMMBTA92LT1G	onsemi	Active	500	300	300	50	−55 to 150	SOT-23-3	ROHS3	Yes (AEC-Q101)
SMMBTA92LT3G	onsemi	Active	500	300	300	50	−55 to 150	SOT-23-3	ROHS3	Yes (AEC-Q101)
MMBTA92-TP	Micro Commercial Co	Active	300	300	300	50	−55 to 150	SOT-23-3	ROHS3	No
MMBTA92,215	Nexperia USA Inc.	Active	100	300	250	50	−55 to 150	SOT-23-3	ROHS3	Yes (AEC-Q101)
BF821,215	Nexperia USA Inc.	Active	50	300	250	60	−55 to 150	TO-236AB	ROHS3	Yes (AEC-Q101)
BF821,235	Nexperia USA Inc.	Active	50	300	250	60	−55 to 150	TO-236AB	ROHS3	Yes (AEC-Q101)
FMMTA92TA	Diodes Incorporated	Active	200	300	330	50	−55 to 150	SOT-23-3	ROHS3	No
FMMT597TA	Diodes Incorporated	Active	200	300	500	75	−55 to 150	SOT-23-3	ROHS3	Yes (AEC-Q101)

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

MMBTA92LT3G (onsemi) or MMBTA92LT1G (onsemi) provide complete electrical and mechanical equivalence to the obsolete MMBTA92LT3. Both are active products with ROHS3 compliance. Selection between these two depends on packaging requirements: MMBTA92LT3G is supplied in Tape & Reel format, while MMBTA92LT1G is supplied in Cut Tape with Digi-Reel. Both maintain identical electrical performance across all specified parameters.

Automotive-Grade Alternative:

SMMBTA92LT1G or SMMBTA92LT3G (onsemi) are automotive-qualified variants with AEC-Q101 certification and ROHS3 compliance. These are suitable for applications requiring automotive-grade components and provide identical electrical specifications to the main part.

Alternative Manufacturer Options:

MMBTA92-TP (Micro Commercial Co) provides equivalent electrical performance with 300 mA collector current rating (lower than the 500 mA main part specification) and is suitable for applications where current requirements do not exceed 300 mA.

FMMTA92TA (Diodes Incorporated) offers 200 mA collector current with identical voltage and frequency specifications, appropriate for lower-current applications.

Parts with reduced collector current ratings (MMBTA92,215 at 100 mA, BF821,215 and BF821,235 at 50 mA) are suitable only for applications where the circuit design accommodates the lower current capability.

Compliance Considerations:

The original MMBTA92LT3 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can MMBTA92LT1G be used as a direct replacement for MMBTA92LT3?

A: Yes. Both parts are manufactured by onsemi with identical electrical specifications: 500 mA collector current, 300 V breakdown voltage, 300 mW power dissipation, 50 MHz transition frequency, and −55 to 150 °C operating range. The difference is packaging format: MMBTA92LT3G uses Tape & Reel, while MMBTA92LT1G uses Cut Tape with Digi-Reel. Both fit the SOT-23-3 footprint identically.

Q: What is the difference between MMBTA92LT3G and SMMBTA92LT3G?

A: Both parts are manufactured by onsemi with identical electrical specifications and SOT-23-3 packaging. The SMMBTA92LT3G variant includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. For non-automotive applications, either part is acceptable. For automotive applications, SMMBTA92LT3G is required.

Q: Can BF821,215 replace MMBTA92LT3 in all applications?

A: No. While BF821,215 shares the same 300 V breakdown voltage and SOT-23-3 package footprint, it is rated for only 50 mA maximum collector current compared to the 500 mA rating of MMBTA92LT3. BF821,215 is suitable only for applications where circuit current requirements do not exceed 50 mA.

Q: Is MMBTA92-TP a suitable substitute?

A: MMBTA92-TP is suitable for applications where the maximum collector current requirement does not exceed 300 mA. It provides identical voltage (300 V), power dissipation (300 mW), frequency (50 MHz), and temperature range (−55 to 150 °C) specifications. For applications requiring the full 500 mA capability, MMBTA92LT3G or MMBTA92LT1G are required.

Q: What is the significance of the ",215" designation in part numbers like MMBTA92,215?

A: The ",215" suffix indicates a specific packaging or tape format variant from the manufacturer. It does not affect electrical specifications. Parts with and without this suffix designation maintain identical electrical performance.

Q: Are all recommended substitutes available in the same package?

A: All recommended substitutes use SOT-23-3 or TO-236AB packages, which are mechanically and electrically compatible for PCB footprint purposes. TO-236AB and SOT-23-3 are equivalent designations for the same physical package.

Q: Which substitute should be selected for new designs?

A: For new designs, MMBTA92LT3G or MMBTA92LT1G (onsemi) are recommended as they provide complete electrical equivalence, active product status, and ROHS3 compliance. For automotive applications, SMMBTA92LT3G or SMMBTA92LT1G provide the same specifications with AEC-Q101 qualification.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Both formats contain identical components. Tape & Reel (TR) is supplied on continuous tape in reel format for automated assembly lines. Cut Tape (CT) with Digi-Reel is supplied in shorter tape segments. Selection depends on production volume and assembly equipment compatibility, not electrical performance.

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