MMBTA92-7 Equivalent & Substitute Parts

Part Overview

The MMBTA92-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, 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 qualified to AEC-Q101 automotive standards and operates across a temperature range of -55°C to 150°C. The MMBTA92-7 is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

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
DC Current Gain (hFE Min)	25	@ 30mA, 10V
Vce Saturation (Max)	500	mV @ 2mA, 20mA
Operating Temperature Range	-55 to 150	°C
Package	SOT-23-3	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the MMBTA92-7 is determined by the following critical parameters: transistor type (PNP), collector-emitter breakdown voltage (300 V minimum), collector current rating (500 mA minimum for direct replacement), power dissipation capability (300 mW minimum), transition frequency (50 MHz minimum), and surface mount package compatibility (SOT-23-3 or equivalent TO-236-3/SC-59). Automotive grade and AEC-Q101 qualification are required for applications demanding these certifications.

Substitute parts are grouped into three categories:

Direct Parametric Equivalents: Parts with identical electrical specifications and full parameter match, differing only in packaging format or manufacturer.

Functional Equivalents with Reduced Current Rating: Parts meeting voltage, frequency, and power specifications but with lower maximum collector current (100 mA or 50 mA), suitable for applications not requiring the full 500 mA capability.

Enhanced Performance Equivalents: Parts exceeding the MMBTA92-7 specifications in voltage rating or frequency, providing design margin while maintaining backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	fT MHz	hFE Min	Vce Sat mV	Package	Grade	RoHS	Status
MMBTA92-7	Diodes Inc.	500	300	300	50	25	500	SOT-23-3	Automotive	Non-compliant	Discontinued
MMBTA92-7-F	Diodes Inc.	500	300	300	50	25	500	SOT-23-3	Automotive	ROHS3 Compliant	Active
MMBTA92LT1G	onsemi	500	300	300	50	25	500	SOT-23-3	—	ROHS3 Compliant	Active
MMBTA92LT3G	onsemi	500	300	300	50	25	500	SOT-23-3	—	ROHS3 Compliant	Active
SMMBTA92LT1G	onsemi	500	300	300	50	25	500	SOT-23-3	Automotive	ROHS3 Compliant	Active
MMBTA92,215	Nexperia USA Inc.	100	300	250	50	25	500	TO-236AB	Automotive	ROHS3 Compliant	Active
PMBTA92,215	Nexperia USA Inc.	100	300	250	50	25	500	TO-236AB	Automotive	ROHS3 Compliant	Active
PMBTA92,235	Nexperia USA Inc.	100	300	250	50	25	500	TO-236AB	Automotive	ROHS3 Compliant	Active
MMBTA92-TP	Micro Commercial Co	300	300	300	50	100	200	SOT-23	—	ROHS3 Compliant	Active
BF821,215	Nexperia USA Inc.	50	300	250	60	50	800	TO-236AB	Automotive	ROHS3 Compliant	Active
MMBT6520LT1G	onsemi	500	350	225	200	20	1000	SOT-23-3	—	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

MMBTA92-7-F (Diodes Incorporated) is the direct successor to the discontinued MMBTA92-7. This part maintains identical electrical specifications and automotive AEC-Q101 qualification while achieving ROHS3 compliance. The -7-F variant is available in active production with substantial inventory.

Alternative Direct Equivalents:

SMMBTA92LT1G (onsemi) provides full parametric equivalence with automotive grade qualification and AEC-Q101 certification. MMBTA92LT1G and MMBTA92LT3G (onsemi) offer identical electrical performance and ROHS3 compliance, with the primary difference being packaging format (Cut Tape vs. Tape & Reel).

Reduced Current Alternatives:

MMBTA92,215 and PMBTA92,215 (Nexperia USA Inc.) and PMBTA92,235 (Nexperia USA Inc.) are suitable for applications requiring maximum collector current of 100 mA or less. These parts maintain the 300 V voltage rating, 50 MHz transition frequency, and automotive AEC-Q101 qualification.

Lower Current Alternative:

BF821,215 (Nexperia USA Inc.) is applicable only to designs with maximum collector current requirements of 50 mA. This part provides enhanced transition frequency (60 MHz) but exhibits higher saturation voltage (800 mV).

Enhanced Performance Alternative:

MMBT6520LT1G (onsemi) exceeds the MMBTA92-7 specifications with 350 V collector-emitter breakdown voltage and 200 MHz transition frequency. This part is suitable for designs requiring additional voltage margin or higher frequency operation, though it exhibits lower DC current gain (20 vs. 25) and higher saturation voltage (1000 mV vs. 500 mV).

Reduced Current Alternative with Modified Characteristics:

MMBTA92-TP (Micro Commercial Co) supports maximum collector current of 300 mA with enhanced DC current gain (100 vs. 25) and reduced saturation voltage (200 mV vs. 500 mV). This part is applicable to designs not requiring the full 500 mA capability.

All recommended substitutes are ROHS3 compliant and in active production status.

Frequently Asked Questions (FAQ)

Q: Can MMBTA92-7-F be used as a direct drop-in replacement for MMBTA92-7?

A: Yes. MMBTA92-7-F is electrically and mechanically identical to MMBTA92-7, with the primary difference being ROHS3 compliance and active production status. Both parts share identical electrical specifications, package type (SOT-23-3), and automotive AEC-Q101 qualification.

Q: What is the difference between MMBTA92LT1G and SMMBTA92LT1G?

A: Both parts are manufactured by onsemi and provide identical electrical specifications. SMMBTA92LT1G carries automotive grade designation and AEC-Q101 qualification, while MMBTA92LT1G does not specify these certifications. The packaging format differs: MMBTA92LT1G is supplied in Cut Tape & Digi-Reel format, while MMBTA92LT3G is supplied in Tape & Reel format.

Q: Can MMBTA92,215 or PMBTA92,215 replace MMBTA92-7 in all applications?

A: No. These parts are limited to maximum collector current of 100 mA, compared to 500 mA for MMBTA92-7. They are suitable only for applications where the design current does not exceed 100 mA. Both parts maintain the 300 V voltage rating and 50 MHz transition frequency.

Q: What are the advantages of MMBT6520LT1G over MMBTA92-7?

A: MMBT6520LT1G provides higher collector-emitter breakdown voltage (350 V vs. 300 V) and significantly higher transition frequency (200 MHz vs. 50 MHz). These characteristics provide design margin for high-voltage and high-frequency applications. However, this part exhibits lower DC current gain (20 vs. 25) and higher saturation voltage (1000 mV vs. 500 mV).

Q: Are all substitute parts automotive qualified?

A: No. MMBTA92-7-F, SMMBTA92LT1G, MMBTA92,215, PMBTA92,215, PMBTA92,235, and BF821,215 carry automotive grade designation and AEC-Q101 qualification. MMBTA92LT1G, MMBTA92LT3G, MMBTA92-TP, and MMBT6520LT1G do not specify automotive qualification in the provided data.

Q: What is the significance of the packaging designation differences (SOT-23-3 vs. TO-236AB)?

A: SOT-23-3 and TO-236AB are equivalent package designations for the same physical form factor. Both refer to a three-lead surface mount package with identical pin configuration and footprint. Parts specified as TO-236AB are functionally interchangeable with SOT-23-3 packages in PCB layouts.

Q: Can BF821,215 be used in high-current applications?

A: No. BF821,215 is limited to maximum collector current of 50 mA. This part is suitable only for low-current signal switching and amplification applications. Applications requiring 300 mA or higher current must use MMBTA92-7, MMBTA92-7-F, or equivalent 500 mA rated parts.

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

A: Both formats contain identical electronic components. Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels suitable for automated assembly equipment. The choice depends on manufacturing process requirements, not electrical performance.

Q: Is ROHS3 compliance required for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other jurisdictions. MMBTA92-7 is non-compliant, while MMBTA92-7-F and all onsemi alternatives are ROHS3 compliant. Verify regulatory requirements for your specific application and market.

Q: Can MMBTA92-TP replace MMBTA92-7 in all circuit designs?

A: MMBTA92-TP is suitable for applications with maximum collector current of 300 mA or less. This part offers improved DC current gain (100 vs. 25) and reduced saturation voltage (200 mV vs. 500 mV), which may improve circuit performance in some designs. However, it does not support the full 500 mA capability of MMBTA92-7.

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