MMBTA92 Equivalent & Substitute Parts

Part Overview

The MMBTA92 is a PNP bipolar junction transistor (BJT) manufactured by onsemi, housed in a SOT-23-3 surface mount package. This component is rated for 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 350 mW power dissipation. The MMBTA92 is classified as an obsolete product, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	350	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236)	—
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 of the MMBTA92 is determined by strict equivalence across the following critical parameters: transistor type (PNP), collector-emitter breakdown voltage (300 V minimum), maximum collector current (500 mA minimum), power dissipation capability (350 mW minimum), transition frequency (50 MHz minimum), operating temperature range (-55°C to 150°C minimum), and surface mount SOT-23-3 package compatibility. Parts are classified into three categories:

Direct Equivalents maintain all electrical specifications and differ only in product status (active versus obsolete) or packaging format (cut tape, digi-reel, or tape & reel). These parts are pin-compatible and electrically interchangeable without circuit modification.

Similar Parts share the same transistor type, package, and core voltage/current ratings but may exhibit variations in power dissipation, transition frequency, or saturation voltage within acceptable design margins. These parts are suitable for applications where the MMBTA92 specifications represent design headroom.

Upgrade Parts exceed the MMBTA92 specifications in one or more parameters (higher voltage rating, higher frequency capability, or improved gain characteristics) and are suitable for designs requiring enhanced performance or reliability margins.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce Breakdown (V)	Ic Max (mA)	Power Max (mW)	Frequency (MHz)	Package	Grade
MMBTA92	onsemi	Obsolete	300	500	350	50	SOT-23-3	Standard
MMBTA92LT1G	onsemi	Active	300	500	300	50	SOT-23-3	Standard
SMMBTA92LT1G	onsemi	Active	300	500	300	50	SOT-23-3	Automotive (AEC-Q101)
SMMBTA92LT3G	onsemi	Active	300	500	300	50	SOT-23-3	Automotive (AEC-Q101)
MMBTA92LT3G	onsemi	Active	300	500	300	50	SOT-23-3	Standard
MSB92T1G	onsemi	Active	300	150	150	50	SC-59	Standard
NSVMMBT6520LT1G	onsemi	Active	350	500	225	200	SOT-23-3	Automotive (AEC-Q101)
MMBTA92-7-F	Diodes Incorporated	Active	300	500	300	50	SOT-23-3	Automotive (AEC-Q101)
CMPTA92E TR PBFREE	Central Semiconductor Corp	Active	350	500	350	75	SOT-23	Standard
DP350T05-7	Diodes Incorporated	Active	350	500	300	50	SOT-23-3	Standard
FMMT597TA	Diodes Incorporated	Active	300	200	500	75	SOT-23-3	Automotive (AEC-Q101)

Engineering Selection Recommendations

Direct Equivalent Selection: MMBTA92LT1G and MMBTA92LT3G from onsemi are direct functional equivalents with active product status. Both maintain 300 V breakdown voltage, 500 mA collector current, and 50 MHz transition frequency. MMBTA92LT1G is supplied in cut tape and digi-reel packaging, while MMBTA92LT3G is supplied in tape & reel format. Selection between these variants depends on procurement and assembly requirements.

Automotive-Grade Equivalents: SMMBTA92LT1G and SMMBTA92LT3G are onsemi automotive-grade variants with AEC-Q101 qualification. These parts are electrically identical to standard-grade equivalents but include automotive qualification documentation. Selection is required for applications subject to automotive reliability standards.

Cross-Manufacturer Equivalent: MMBTA92-7-F from Diodes Incorporated provides electrical equivalence with automotive qualification (AEC-Q101). This part maintains identical voltage, current, and frequency specifications and is suitable for applications requiring multi-source component availability.

Upgraded Voltage Rating: NSVMMBT6520LT1G (onsemi) and DP350T05-7 (Diodes Incorporated) provide 350 V breakdown voltage with 500 mA collector current in SOT-23-3 packages. These parts are suitable for designs requiring higher voltage margin. NSVMMBT6520LT1G includes automotive qualification; DP350T05-7 is standard grade.

Enhanced Performance Upgrade: CMPTA92E TR PBFREE from Central Semiconductor Corp offers 350 V breakdown voltage, 500 mA collector current, and 75 MHz transition frequency. This part provides both voltage and frequency improvements over the MMBTA92 baseline.

Current-Limited Alternative: MSB92T1G from onsemi is suitable only for applications where collector current requirements do not exceed 150 mA. This part shares the 300 V voltage rating and 50 MHz frequency but is limited to 150 mW power dissipation and SC-59 package format.

Higher Current Capability: FMMT597TA from Diodes Incorporated is limited to 200 mA collector current but offers 500 mW power dissipation and 75 MHz transition frequency. This part is suitable for applications requiring higher power handling at reduced current levels and includes automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can MMBTA92LT1G directly replace MMBTA92 in existing designs?

A: Yes. MMBTA92LT1G maintains identical electrical specifications (300 V, 500 mA, 50 MHz) and SOT-23-3 package compatibility. The primary difference is active product status versus obsolete status. No circuit modifications are required.

Q: What is the difference between MMBTA92LT1G and SMMBTA92LT1G?

A: Both parts are electrically identical with 300 V breakdown voltage, 500 mA collector current, and 50 MHz transition frequency. SMMBTA92LT1G includes automotive-grade qualification (AEC-Q101) and is suitable for automotive applications. MMBTA92LT1G is standard grade. Selection depends on application requirements.

Q: Why does MMBTA92LT1G show 300 mW power rating while MMBTA92 shows 350 mW?

A: Both parts are functionally equivalent for the MMBTA92 application. The 300 mW rating on MMBTA92LT1G represents the specified maximum continuous power dissipation under defined thermal conditions. The MMBTA92 350 mW specification represents an alternative rating methodology. For circuit design purposes, use the lower 300 mW value as the conservative design limit.

Q: Can I use NSVMMBT6520LT1G as a drop-in replacement for MMBTA92?

A: NSVMMBT6520LT1G is pin-compatible in SOT-23-3 package and electrically compatible for applications designed for 300 V operation. The 350 V breakdown voltage provides additional margin. However, this part exhibits different saturation voltage characteristics (1 V @ 5mA, 50mA versus 500 mV @ 2mA, 20mA) and lower DC current gain (20 @ 50mA, 10V versus 25 @ 30mA, 10V). Verify circuit performance before deployment.

Q: Is MSB92T1G suitable for MMBTA92 replacement?

A: MSB92T1G is not suitable as a direct replacement. While it shares the 300 V voltage rating and 50 MHz frequency, the maximum collector current is limited to 150 mA (versus 500 mA for MMBTA92) and power dissipation is limited to 150 mW (versus 350 mW). Additionally, MSB92T1G uses SC-59 package format instead of SOT-23-3. This part is suitable only for applications with collector current requirements below 150 mA.

Q: What packaging options are available for MMBTA92 equivalents?

A: onsemi supplies MMBTA92 equivalents in three packaging formats: cut tape & digi-reel (MMBTA92LT1G), tape & reel (MMBTA92LT3G and SMMBTA92LT3G). All maintain SOT-23-3 package format. Selection depends on assembly equipment and procurement volume requirements. Cut tape format is suitable for lower-volume or manual assembly; tape & reel format is standard for high-volume automated assembly.

Q: Can FMMT597TA replace MMBTA92 in high-current applications?

A: FMMT597TA is not suitable for applications requiring 500 mA collector current. This part is limited to 200 mA maximum collector current. However, FMMT597TA offers 500 mW power dissipation and 75 MHz transition frequency, making it suitable for applications requiring higher power handling at reduced current levels. Verify circuit current requirements before selection.

Q: Are there RoHS-compliant alternatives to MMBTA92?

A: Yes. All listed substitute parts carry RoHS3 compliance status. MMBTA92LT1G, SMMBTA92LT1G, SMMBTA92LT3G, MMBTA92LT3G, MMBTA92-7-F, NSVMMBT6520LT1G, CMPTA92E TR PBFREE, DP350T05-7, and FMMT597TA are all RoHS3 compliant. The original MMBTA92 carries REACH Unaffected status; all substitutes maintain REACH Unaffected status.

Q: What is the difference between standard-grade and automotive-grade MMBTA92 equivalents?

A: Automotive-grade parts (SMMBTA92LT1G, SMMBTA92LT3G, MMBTA92-7-F, NSVMMBT6520LT1G, FMMT597TA) carry AEC-Q101 qualification, indicating compliance with automotive reliability and qualification standards. Standard-grade parts (MMBTA92LT1G, MMBTA92LT3G, CMPTA92E TR PBFREE, DP350T05-7) do not carry automotive qualification. Selection depends on application environment and customer requirements.

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