SO692 Equivalent & Substitute Parts

Part Overview

The STMicroelectronics SO692 is a PNP bipolar junction transistor rated for 300 V collector-emitter breakdown voltage and 100 mA maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SO692 operates at a maximum junction temperature of 150°C with a transition frequency of 50 MHz and power dissipation capability of 310 mW.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector-Emitter Breakdown Voltage (Max)	300	V
Collector Current (Max)	100	mA
Power Dissipation (Max)	310	mW
Transition Frequency	50	MHz
DC Current Gain (hFE Min)	25	@ 30 mA, 10 V
Vce Saturation (Max)	500	mV @ 2 mA, 20 mA
Operating Temperature (Max)	150	°C
Package	SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the SO692 is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Transistor polarity (PNP)
Collector-emitter breakdown voltage (300 V minimum)
Collector current rating (100 mA minimum)
Package type (SOT-23-3 / TO-236-3)
Surface mount configuration

Parameters Allowing Functional Substitution:

Power dissipation (equal or greater than 310 mW)
Transition frequency (equal or greater than 50 MHz)
DC current gain (equal or greater than 25 @ specified conditions)
Vce saturation characteristics (within acceptable operating margins)

Parts are grouped into two categories: Direct Equivalents maintain all critical parameters within specification, while Functional Substitutes exceed one or more electrical ratings while maintaining package compatibility and voltage/current requirements.

Parameter Comparison

Part Number	Manufacturer	Vce(BR) Max (V)	Ic Max (mA)	Power Max (mW)	fT (MHz)	hFE Min	Package	Status
SO692	STMicroelectronics	300	100	310	50	25	SOT-23-3	Obsolete
MMBTA92,215	Nexperia USA Inc.	300	100	250	50	25	TO-236AB	Active
PMBTA92,215	Nexperia USA Inc.	300	100	250	50	25	TO-236AB	Active
BF821,215	Nexperia USA Inc.	300	50	250	60	50	TO-236AB	Active
BF821,235	Nexperia USA Inc.	300	50	250	60	50	TO-236AB	Active
BF823,215	Nexperia USA Inc.	250	50	250	60	50	TO-236AB	Active
BSS63,215	Nexperia USA Inc.	100	100	250	85	30	TO-236AB	Active
CMPTA92 TR	Central Semiconductor Corp	300	500	350	50	25	SOT-23	Active
FMMT597TA	Diodes Incorporated	300	200	500	75	100	SOT-23-3	Active
FMMTA92TA	Diodes Incorporated	300	200	330	50	25	SOT-23-3	Active
MMBT3906LT1G	onsemi	40	200	300	250	100	SOT-23-3	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

MMBTA92,215 and PMBTA92,215 from Nexperia USA Inc. are direct electrical equivalents to the SO692. Both maintain 300 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 50 MHz transition frequency. These parts are active products with AEC-Q101 automotive qualification and ROHS3 compliance. The primary difference is reduced power dissipation (250 mW versus 310 mW), which is acceptable for applications not requiring maximum thermal headroom.

Functional Substitutes (Higher Current or Power Capability):

FMMT597TA (Diodes Incorporated) and FMMTA92TA (Diodes Incorporated) exceed SO692 specifications in collector current (200 mA) and power dissipation (500 mW and 330 mW respectively) while maintaining 300 V voltage rating and SOT-23-3 packaging. FMMT597TA additionally provides 75 MHz transition frequency and 100 hFE minimum gain. These parts are suitable for applications requiring enhanced current handling or thermal margin.

CMPTA92 TR (Central Semiconductor Corp) provides 500 mA collector current capability with 300 V rating and 350 mW power dissipation in SOT-23 package, suitable for higher-current switching applications.

Limited Substitutes (Reduced Voltage Rating):

BF823,215 (Nexperia USA Inc.) operates at 250 V maximum collector-emitter breakdown voltage, which is below the SO692 specification. This part is suitable only for applications with maximum operating voltages not exceeding 250 V.

BSS63,215 (Nexperia USA Inc.) is rated for 100 V maximum collector-emitter breakdown voltage and is not suitable for 300 V applications.

MMBT3906LT1G (onsemi) is rated for 40 V maximum collector-emitter breakdown voltage and is not suitable for 300 V applications.

Compliance and Certification:

MMBTA92,215, PMBTA92,215, BF821,215, BF821,235, BF823,215, BSS63,215, FMMT597TA, and FMMTA92TA all carry AEC-Q101 automotive qualification. All listed parts are ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can MMBTA92,215 directly replace SO692 in all applications?

A: MMBTA92,215 is electrically equivalent in voltage, current, and frequency specifications. The reduced power dissipation rating (250 mW versus 310 mW) requires verification that thermal dissipation in the application does not exceed 250 mW. Package compatibility is confirmed (both SOT-23-3 / TO-236 variants).

Q: What is the difference between MMBTA92,215 and PMBTA92,215?

A: Both parts are electrically identical with 300 V rating, 100 mA current, and 50 MHz frequency. The difference is in packaging format: MMBTA92,215 is available in Cut Tape and Digi-Reel, while PMBTA92,215 is also available in Cut Tape and Digi-Reel. Selection depends on procurement and assembly requirements.

Q: Can FMMT597TA be used in place of SO692?

A: FMMT597TA is a functional substitute with higher current (200 mA) and power (500 mW) ratings, maintaining 300 V voltage and SOT-23-3 package. It is suitable for applications where the SO692 is current-limited. Verify that the higher hFE (100 minimum) does not affect circuit biasing or switching characteristics.

Q: Why is MMBT3906LT1G listed if it cannot replace SO692?

A: MMBT3906LT1G is listed because it was referenced in the SO692 substitute list provided in the source data. However, its 40 V maximum rating makes it unsuitable for 300 V applications. This part should not be selected for SO692 replacement in circuits operating above 40 V.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry ROHS3 compliance certification. All are REACH unaffected. Verify specific compliance requirements for your application and supply chain.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates the part meets automotive-grade reliability standards. MMBTA92,215, PMBTA92,215, BF821,215, BF821,235, BF823,215, BSS63,215, and FMMT597TA carry this qualification. FMMTA92TA and CMPTA92 TR do not list AEC-Q101 qualification in provided specifications.

Q: Can BF821,215 replace SO692 in a 300 V application?

A: BF821,215 maintains 300 V voltage rating but is limited to 50 mA collector current versus SO692's 100 mA. It is suitable only for applications requiring 50 mA or less. The higher transition frequency (60 MHz) and hFE (50 minimum) may affect circuit performance in some switching applications.

Q: What packaging variants are available for direct equivalents?

A: MMBTA92,215 and PMBTA92,215 are available in Cut Tape (CT) and Digi-Reel packaging. Both use TO-236AB supplier device package designation, which is compatible with SOT-23-3 footprints. Verify PCB assembly equipment compatibility with selected packaging format.

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