MMST3906-7 Equivalent & Substitute Parts

Part Overview

The MMST3906-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. The device operates at 40 V collector-emitter breakdown voltage with a maximum collector current of 200 mA and 200 mW power dissipation in a surface mount SOT-323 package. The MMST3906-7 is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	200	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Vce Saturation (Max)	300	mV @ 5mA, 50mA
DC Current Gain (hFE) Minimum	100	@ 10mA, 1V
Power Dissipation Maximum	200	mW
Transition Frequency	300	MHz
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	SOT-323 (SC-70)	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMST3906-7 are grouped into two categories based on electrical and mechanical compatibility:

Category 1: Direct Equivalents (Identical Electrical Specifications) These parts maintain all critical electrical parameters: 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, 300 mV Vce saturation, 100 mA minimum DC current gain, 200 mW power dissipation, and 300 MHz transition frequency. These parts are pin-compatible in SOT-323 packaging and require no circuit modifications.

Category 2: Functional Substitutes (Enhanced or Reduced Specifications) These parts operate within the same application space but with different electrical characteristics. Substitution is valid when the application requirements do not demand the full specification of the original part. Key differentiating parameters include collector current capability, collector-emitter breakdown voltage, transition frequency, and DC current gain.

Critical Parameters for Substitution Determination:

Collector-Emitter Breakdown Voltage (must equal or exceed 40 V for direct substitution)
Maximum Collector Current (must equal or exceed 200 mA for direct substitution)
Vce Saturation characteristics
DC Current Gain (hFE)
Transition Frequency
Package compatibility (SOT-323)
Operating temperature range

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic Max (mA)	Vce Breakdown (V)	Vce Sat (mV)	hFE Min	Freq (MHz)	Package	RoHS Status
MMST3906-7	Diodes Incorporated	Obsolete	200	40	300 @ 5mA, 50mA	100 @ 10mA, 1V	300	SOT-323	Non-compliant
MMST3906-7-F	Diodes Incorporated	Active	200	40	300 @ 5mA, 50mA	100 @ 10mA, 1V	300	SOT-323	ROHS3 Compliant
MMST3906-TP	Micro Commercial Co	Active	200	40	300 @ 5mA, 50mA	100 @ 10mA, 1V	300	SOT-323	ROHS3 Compliant
2PB709ARW,115	NXP USA Inc.	Active	100	45	500 @ 10mA, 100mA	210 @ 2mA, 10V	70	SOT-323	AEC-Q101
2PB709ASW,115	NXP USA Inc.	Active	100	45	500 @ 10mA, 100mA	290 @ 2mA, 10V	80	SOT-323	AEC-Q101
BC807-16W,115	Nexperia USA Inc.	Active	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	80	SOT-323	ROHS3 Compliant
BC807-16W-TP	Micro Commercial Co	Active	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	80	SOT-323	Not specified
BC807-25W,115	Nexperia USA Inc.	Active	500	45	700 @ 50mA, 500mA	160 @ 100mA, 1V	80	SOT-323	ROHS3 Compliant
BC807-25W,135	NXP USA Inc.	Active	500	45	700 @ 50mA, 500mA	160 @ 100mA, 1V	80	SOT-323	Not specified
BC807-40W,115	Nexperia USA Inc.	Active	500	45	700 @ 50mA, 500mA	250 @ 100mA, 1V	80	SOT-323	ROHS3 Compliant
BC807-40W,135	Nexperia USA Inc.	Active	500	45	700 @ 50mA, 500mA	250 @ 100mA, 1V	80	SOT-323	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes)

MMST3906-7-F and MMST3906-TP are direct electrical equivalents to the MMST3906-7. Both parts maintain identical electrical specifications across all critical parameters: 200 mA collector current, 40 V breakdown voltage, 300 mV Vce saturation, 100 mA DC current gain, and 300 MHz transition frequency. Both are active product status with ROHS3 compliance, addressing the obsolescence of the original part. MMST3906-7-F is supplied by Diodes Incorporated in Tape & Reel packaging with 425,100 units in stock. MMST3906-TP is supplied by Micro Commercial Co in Tape & Reel packaging with 2,748 units in stock. These parts require no circuit modifications and are suitable for direct replacement in all applications.

Functional Substitutes (Application-Dependent Selection)

The BC807 series (BC807-16W, BC807-25W, BC807-40W) and 2PB709 series (2PB709ARW, 2PB709ASW) are functional substitutes when application requirements permit reduced collector current or modified gain characteristics. The BC807 variants offer 500 mA collector current capability with 45 V breakdown voltage, exceeding the original part specifications. These parts are suitable for applications where higher current handling is beneficial or where the original 200 mA specification is not fully utilized. The 2PB709 series provides 100 mA collector current with 45 V breakdown voltage and automotive-grade AEC-Q101 qualification, suitable for applications requiring automotive compliance or reduced current requirements.

Compliance and Availability Considerations

All recommended substitutes are active product status with established supply chains. MMST3906-7-F and BC807-40W,115 offer the highest inventory availability (425,100 and 67,388 units respectively). All direct equivalents and BC807 variants are ROHS3 compliant. The 2PB709 series carries AEC-Q101 automotive qualification, appropriate for automotive and industrial applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can MMST3906-7-F be used as a direct replacement for MMST3906-7?

A: Yes. MMST3906-7-F is a direct electrical equivalent with identical specifications across all critical parameters. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. Non-compliant). No circuit modifications are required.

Q: What is the difference between MMST3906-7-F and MMST3906-TP?

A: Both parts are direct electrical equivalents with identical electrical specifications. The difference is manufacturer: MMST3906-7-F is supplied by Diodes Incorporated, while MMST3906-TP is supplied by Micro Commercial Co. Both are ROHS3 compliant and active product status.

Q: Can BC807-40W,115 replace MMST3906-7 in all applications?

A: BC807-40W,115 is a functional substitute suitable for applications where the original 200 mA collector current specification is not fully utilized. The BC807-40W offers 500 mA collector current capability and 45 V breakdown voltage, both exceeding the original part. However, the transition frequency is reduced from 300 MHz to 80 MHz. Substitution is valid only when the application does not require the higher frequency response of the original part.

Q: What are the key differences between the BC807 variants (BC807-16W, BC807-25W, BC807-40W)?

A: All BC807 variants share identical electrical specifications except for DC current gain (hFE). BC807-16W has minimum hFE of 100 @ 100mA, 1V. BC807-25W has minimum hFE of 160 @ 100mA, 1V. BC807-40W has minimum hFE of 250 @ 100mA, 1V. Selection depends on the required gain characteristics for the specific application.

Q: Are the 2PB709 series parts suitable replacements for MMST3906-7?

A: The 2PB709 series (2PB709ARW and 2PB709ASW) are functional substitutes for applications where reduced collector current (100 mA vs. 200 mA) is acceptable. These parts offer 45 V breakdown voltage and AEC-Q101 automotive qualification. The transition frequency is significantly reduced (70-80 MHz vs. 300 MHz). Substitution is appropriate for low-frequency switching applications in automotive environments.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS compliance indicates conformance to Restriction of Hazardous Substances regulations. The original MMST3906-7 is RoHS non-compliant. Direct equivalents MMST3906-7-F and MMST3906-TP are ROHS3 compliant, meeting current environmental and regulatory requirements. For new designs and production, ROHS3 compliant parts are required in most jurisdictions.

Q: Can parts with different package codes be substituted?

A: All recommended substitutes use SOT-323 (SC-70) surface mount packaging, identical to the original MMST3906-7. Package compatibility is maintained across all substitute options. Packaging variations (Tape & Reel, Cut Tape, Bulk) refer to supply format only and do not affect electrical compatibility or board-level installation.

Q: What is the impact of Vce saturation differences on substitution?

A: Vce saturation affects switching speed and power dissipation in saturation mode. The original MMST3906-7 has 300 mV Vce saturation @ 5mA, 50mA. Direct equivalents maintain this specification. BC807 variants have 700 mV Vce saturation @ 50mA, 500mA, resulting in higher power dissipation during saturation. This difference is significant in high-frequency switching applications or designs with tight thermal budgets.

Q: Is automotive-grade qualification (AEC-Q101) required for all applications?

A: AEC-Q101 qualification is required only for automotive applications. The 2PB709 series carries this qualification. For general industrial and consumer applications, AEC-Q101 qualification is not necessary. MMST3906-7-F and MMST3906-TP are suitable for non-automotive applications without this qualification.

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