MMST3906-TP Equivalent & Substitute Parts

Part Overview

The MMST3906-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, rated for 40V collector-emitter breakdown voltage and 200mA maximum collector current. This surface mount device in SOT-323 package is designed for general-purpose switching and amplification applications operating across -55°C to 150°C. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative packaging or manufacturer specifications better suit application requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	200	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V	—
Power - Max	200	mW
Frequency - Transition	300	MHz
Operating Temperature	-55 to 150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical parameter alignment with the MMST3906-TP:

Direct Substitutes maintain all critical electrical parameters within specification: 40V collector-emitter breakdown voltage, 200mA maximum collector current, 100mV minimum DC current gain at specified conditions, SOT-323 package, and surface mount configuration. These parts differ only in manufacturer, packaging format (Tape & Reel versus Cut Tape), or minor variations in transition frequency (250MHz to 300MHz) and power dissipation (150mW to 200mW) that remain within functional equivalence. Direct substitutes include MMBT3906WT1G, MMST3906-7-F, PMST3906,115, SMMBT3906WT1G, and UMT3906T106.

Similar Parts share the same transistor type (PNP), package family (SOT-323), and surface mount configuration but exceed one or more electrical parameters beyond the MMST3906-TP specification. These parts are suitable for applications where higher current capacity, voltage rating, or power dissipation provides design margin or where the application requirements permit relaxed specifications. Similar parts include BC807-25W-7, BC857BW-7-F, BC857CW-7-F, CMST3906, and DSS5140U-7.

Key Parameters Determining Substitution:

Transistor Type: PNP
Collector-Emitter Breakdown Voltage: 40V minimum
Maximum Collector Current: 200mA minimum
DC Current Gain (hFE): 100 minimum at specified bias conditions
Package: SOT-323 or SC-70 equivalent
Mounting: Surface Mount
RoHS Compliance: ROHS3 Compliant

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat (Max) mV	hFE (Min)	Power mW	Freq MHz	Temp °C	Package	Packaging
MMST3906-TP	Micro Commercial Co	200	40	300	100	200	300	-55 to 150	SOT-323	Tape & Reel
MMBT3906WT1G	onsemi	200	40	400	100	150	250	-55 to 150	SC-70-3	Cut Tape & Digi-Reel
MMST3906-7-F	Diodes Incorporated	200	40	300	100	200	300	-55 to 150	SOT-323	Tape & Reel
PMST3906,115	Nexperia USA Inc.	200	40	400	100	200	250	-55 to 150	SOT-323	Cut Tape & Digi-Reel
SMMBT3906WT1G	onsemi	200	40	400	100	150	250	-55 to 150	SC-70-3	Cut Tape & Digi-Reel
UMT3906T106	Rohm Semiconductor	200	40	400	100	200	250	-55 to 150	SC-70	Cut Tape & Digi-Reel
BC807-25W-7	Diodes Incorporated	500	45	700	160	200	100	-65 to 150	SOT-323	Cut Tape & Digi-Reel
BC857BW-7-F	Diodes Incorporated	100	45	650	220	200	200	-65 to 150	SOT-323	Tape & Reel
BC857CW-7-F	Diodes Incorporated	100	45	650	420	200	200	-65 to 150	SOT-323	Tape & Reel
CMST3906	Central Semiconductor Corp	200	40	400	100	275	250	-65 to 150	SOT-323	Tape & Reel
DSS5140U-7	Diodes Incorporated	1000	40	500	300	400	150	-55 to 150	SOT-323	Tape & Reel

Engineering Selection Recommendations

Direct Substitutes for Pin-Compatible Replacement:

MMST3906-7-F (Diodes Incorporated) provides identical electrical specifications to the MMST3906-TP with matching 40V breakdown voltage, 200mA collector current, 300mV saturation voltage, and 300MHz transition frequency. This part is Active status and ROHS3 compliant, suitable for direct substitution in existing designs without circuit modification.

MMBT3906WT1G and SMMBT3906WT1G (onsemi) maintain 40V breakdown voltage and 200mA collector current with slightly reduced transition frequency (250MHz) and power dissipation (150mW). Both are Active status and ROHS3 compliant. SMMBT3906WT1G includes AEC-Q101 automotive qualification.

PMST3906,115 (Nexperia USA Inc.) matches 40V breakdown voltage and 200mA collector current with AEC-Q101 automotive qualification and Active status. This part is suitable for automotive-grade applications.

UMT3906T106 (Rohm Semiconductor) provides 40V breakdown voltage and 200mA collector current in UMT3 package variant with Active status and ROHS3 compliance.

Similar Parts for Enhanced Performance Margin:

CMST3906 (Central Semiconductor Corp) maintains 40V breakdown voltage and 200mA collector current with increased power dissipation (275mW) and extended operating temperature range (-65°C to 150°C). Active status and ROHS3 compliant.

DSS5140U-7 (Diodes Incorporated) provides 40V breakdown voltage with significantly higher collector current (1A) and power dissipation (400mW), suitable for applications requiring higher current capacity. Includes AEC-Q101 automotive qualification and Active status.

BC807-25W-7 (Diodes Incorporated) offers 45V breakdown voltage and 500mA collector current with extended temperature range (-65°C to 150°C). Active status and ROHS3 compliant.

BC857BW-7-F and BC857CW-7-F (Diodes Incorporated) provide 45V breakdown voltage with reduced collector current (100mA) and extended temperature range (-65°C to 150°C). Both are Active status and ROHS3 compliant. BC857CW-7-F features higher DC current gain (420 minimum).

All listed parts maintain ROHS3 compliance, MSL 1 rating, and surface mount configuration. Selection between direct substitutes and similar parts depends on application current requirements, power dissipation budget, and frequency performance needs.

Frequently Asked Questions (FAQ)

Q: Can MMBT3906WT1G replace MMST3906-TP directly in production?

A: MMBT3906WT1G is electrically compatible as a direct substitute, maintaining 40V breakdown voltage, 200mA collector current, and 100 minimum DC current gain. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and slightly reduced transition frequency (250MHz versus 300MHz). Circuit performance remains within specification for applications not requiring the full 300MHz bandwidth.

Q: What is the difference between direct substitutes and similar parts?

A: Direct substitutes maintain all critical electrical parameters (40V breakdown, 200mA current, saturation voltage, DC gain) within the MMST3906-TP specification. Similar parts exceed one or more parameters, such as DSS5140U-7 with 1A collector current or BC807-25W-7 with 45V breakdown voltage. Similar parts are suitable when application requirements permit higher ratings or when design margin is beneficial.

Q: Are automotive-qualified alternatives available?

A: Yes. PMST3906,115 (Nexperia), SMMBT3906WT1G (onsemi), and DSS5140U-7 (Diodes Incorporated) all include AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring qualification compliance.

Q: Does package variant affect circuit compatibility?

A: All listed parts use SOT-323 or SC-70 package variants with identical pin configurations and footprints. Package variants do not affect circuit compatibility. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) affect supply and handling only, not electrical performance.

Q: Which substitute offers the best thermal performance?

A: CMST3906 provides the highest power dissipation rating (275mW) among direct substitutes, and DSS5140U-7 offers 400mW for applications requiring enhanced thermal margin. Both maintain 40V breakdown voltage and are suitable for higher power applications.

Q: Can BC857 series parts replace MMST3906-TP?

A: BC857BW-7-F and BC857CW-7-F are similar parts with reduced collector current (100mA versus 200mA) and higher breakdown voltage (45V versus 40V). These parts are suitable only for applications where 100mA collector current is sufficient. They are not direct replacements for designs requiring 200mA capability.

Q: What is the temperature operating range difference?

A: MMST3906-TP operates -55°C to 150°C. CMST3906, BC807-25W-7, BC857BW-7-F, and BC857CW-7-F extend the lower limit to -65°C. This extended range is beneficial for applications in extreme cold environments but is not required for standard industrial temperature specifications.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All listed parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and regulatory requirements for commercial and industrial applications.

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