MMBTA92 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MMBTA92 is a PNP bipolar junction transistor manufactured by STMicroelectronics, designed for surface mount applications in the SOT-23-3 package. This device operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 350 mW power dissipation. The MMBTA92 is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

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
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30mA, 10V	—
Current - Collector Cutoff (Max)	100	nA
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBTA92 are grouped based on electrical parameter compatibility within the allowed operating ranges. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: PNP (mandatory)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mandatory for mechanical compatibility)
Voltage - Collector Emitter Breakdown (Max): 300 V or greater
Current - Collector (Ic) (Max): 500 mA or greater
Power - Max: 350 mW or greater
Frequency - Transition: 50 MHz or greater
Mounting Type: Surface Mount (mandatory)

Substitute parts are classified into two categories:

Category A - Direct Electrical Equivalents (300V, 500mA): Parts meeting or exceeding all primary electrical specifications with identical or superior performance characteristics.

Category B - Functional Alternatives (Reduced Current Rating): Parts with 300 V breakdown voltage but reduced maximum collector current (100-200 mA), suitable for applications not requiring full 500 mA capability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency MHz	hFE (Min)	Package
MMBTA92	STMicroelectronics	Obsolete	500	300	350	50	40	SOT-23-3
CMPTA92 TR	Central Semiconductor Corp	Active	500	300	350	50	25	SOT-23-3
DP350T05-7	Diodes Incorporated	Active	500	350	300	50	20	SOT-23-3
FMMT597TA	Diodes Incorporated	Active	200	300	500	75	100	SOT-23-3
FMMT6520TA	Diodes Incorporated	Active	500	350	330	50	20	SOT-23-3
FMMTA92TA	Diodes Incorporated	Active	200	300	330	50	25	SOT-23-3
MMBT3906LT1G	onsemi	Active	200	40	300	250	100	SOT-23-3
MMBT3906LT3G	onsemi	Active	200	40	300	250	100	SOT-23-3
MMBTA92,215	Nexperia USA Inc.	Active	100	300	250	50	25	SOT-23-3
MMBTA92-7-F	Diodes Incorporated	Active	500	300	300	50	25	SOT-23-3
MMBTA92-TP	Micro Commercial Co	Active	300	300	300	50	100	SOT-23-3

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

MMBTA92-7-F (Diodes Incorporated) and CMPTA92 TR (Central Semiconductor Corp) are direct substitutes meeting all electrical specifications of the MMBTA92. Both devices are active products with 500 mA collector current, 300 V breakdown voltage, and 50 MHz transition frequency. MMBTA92-7-F carries automotive qualification (AEC-Q101), suitable for applications requiring automotive-grade components. CMPTA92 TR provides equivalent performance with active product status and unlimited moisture sensitivity rating.

Secondary Substitutes (Enhanced Voltage Rating):

DP350T05-7 and FMMT6520TA (both Diodes Incorporated) provide 350 V collector-emitter breakdown voltage, exceeding the MMBTA92 specification. These devices maintain 500 mA collector current and 50 MHz transition frequency, offering improved voltage margin for high-voltage applications. Both are active products with ROHS3 compliance.

Functional Alternatives (Reduced Current Rating):

FMMTA92TA (Diodes Incorporated) and MMBTA92,215 (Nexperia USA Inc.) operate at 300 V breakdown voltage with reduced collector current ratings (200 mA and 100 mA respectively). These alternatives are suitable for applications where full 500 mA capability is not required. MMBTA92,215 carries automotive qualification (AEC-Q101).

Not Recommended for Direct Substitution:

MMBT3906LT1G and MMBT3906LT3G (onsemi) operate at 40 V breakdown voltage, significantly below the MMBTA92 specification. These devices are not suitable for 300 V applications and should not be selected as substitutes.

Frequently Asked Questions (FAQ)

Q: Can CMPTA92 TR directly replace MMBTA92 in existing designs?

A: Yes. CMPTA92 TR meets all electrical specifications of the MMBTA92, including 500 mA collector current, 300 V breakdown voltage, and 50 MHz transition frequency. Both devices use identical SOT-23-3 packaging. Verify circuit design does not depend on specific hFE characteristics, as CMPTA92 TR specifies minimum hFE of 25 compared to MMBTA92's 40.

Q: What is the difference between MMBTA92-7-F and MMBTA92-TP?

A: MMBTA92-7-F (Diodes Incorporated) supports 500 mA collector current with 300 mW power dissipation and carries automotive qualification (AEC-Q101). MMBTA92-TP (Micro Commercial Co) supports 300 mA collector current with 300 mW power dissipation. Select MMBTA92-7-F for applications requiring full 500 mA capability or automotive qualification.

Q: Are DP350T05-7 and FMMT6520TA interchangeable?

A: Yes, for applications operating at 300 V or below. Both devices provide 350 V breakdown voltage, 500 mA collector current, and 50 MHz transition frequency in SOT-23-3 packaging. Both are active products with ROHS3 compliance. Verify circuit design does not depend on specific saturation voltage characteristics.

Q: Can MMBT3906LT1G substitute for MMBTA92?

A: No. MMBT3906LT1G operates at 40 V breakdown voltage, which is insufficient for applications designed for 300 V operation. This device is not electrically compatible with the MMBTA92 and should not be selected as a substitute.

Q: What packaging options are available for MMBTA92 substitutes?

A: All listed substitute parts use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, identical to the MMBTA92. Packaging variants include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and TO-236AB configurations. Verify tape and reel specifications with supplier documentation for automated assembly compatibility.

Q: Which substitute offers the best current gain (hFE) performance?

A: FMMT597TA, FMMTA92TA, MMBT3906LT1G, and MMBT3906LT3G specify minimum hFE of 100 at specified test conditions. MMBTA92-TP specifies minimum hFE of 100 at 10 mA, 10V. The MMBTA92 specifies minimum hFE of 40 at 30 mA, 10V. Select higher hFE devices only if circuit design requires improved current gain characteristics.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited). All devices are REACH unaffected and classified as EAR99 for export control purposes.

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