MMBT3906 Equivalent & Substitute Parts

Part Overview

The MMBT3906 is a small-signal PNP bipolar junction transistor manufactured by STMicroelectronics, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum collector current of 200 mA, collector-emitter breakdown voltage of 40 V, and maximum power dissipation of 350 mW. The MMBT3906 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Maximum Collector Current (Ic)	200	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Vce Saturation (Max)	400	mV @ 5mA, 50mA
DC Current Gain (hFE Min)	100	@ 10mA, 1V
Maximum Power Dissipation	350	mW
Transition Frequency	250	MHz
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Maximum Operating Temperature	150	°C (TJ)

Substitute Part Grouping Explanation

Substitute parts for the MMBT3906 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Electrical and Mechanical Equivalence): Parts that maintain all critical electrical parameters within the same tolerance bands and use identical or pin-compatible packaging. These parts satisfy the following criteria:

Transistor Type: PNP
Maximum Collector Current: 200 mA
Collector-Emitter Breakdown Voltage: 40 V
DC Current Gain (hFE Min): 100 @ 10mA, 1V
Transition Frequency: 250 MHz
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount

Similar Parts (Functional Compatibility with Parameter Deviations): Parts that operate within the same application space but exhibit variations in one or more electrical parameters. These parts are suitable for applications where the specific parameter deviation does not impact circuit performance.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat mV	hFE (Min)	Freq MHz	Power mW	Temp Range °C	Status	Package
MMBT3906	STMicroelectronics	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	350	–55 to 150	Obsolete	SOT-23-3
CMPT3906G TR PBFREE	Central Semiconductor Corp	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	350	–65 to 150	Active	SOT-23-3
MMBT3906,215	NXP Semiconductors	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	250	–55 to 150	Active	SOT-23-3
MMBT3906-7-F	Diodes Incorporated	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	300	–55 to 150	Active	SOT-23-3
MMBT3906-G	onsemi	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	300	200	–55 to 150	Obsolete	SOT-23-3
MMBT3906-HF	Comchip Technology	200	40	300 @ 5mA, 50mA	100 @ 10mA, 1V	250	300	–55 to 150	Active	SOT-23-3
MMBT3906-TP	Micro Commercial Co	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	300	–55 to 150	Active	SOT-23-3
MMBT3906LT1G	onsemi	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	300	–55 to 150	Active	SOT-23-3
PMBT3906,215	NXP Semiconductors	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	250	–55 to 150	Active	SOT-23-3
SMMBT3906LT3G	onsemi	200	40	400 @ 5mA, 50mA	100 @ 10mA, 1V	250	300	–55 to 150	Active	SOT-23-3
BC807-16-7-F	Diodes Incorporated	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	100	310	–55 to 150	Active	SOT-23-3

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Electrical Compatibility):

The following parts are recommended as primary substitutes for the obsolete MMBT3906:

MMBT3906-7-F (Diodes Incorporated): Active product with AEC-Q101 automotive qualification. Maintains all critical electrical parameters with 300 mW power rating. Suitable for automotive and industrial applications.
MMBT3906LT1G (onsemi): Active product with full parameter equivalence. Highest inventory availability (608,935 units). Recommended for high-volume production.
MMBT3906-TP (Micro Commercial Co): Active product with highest inventory stock (464,200 units). Maintains all electrical specifications with 300 mW power rating.
CMPT3906G TR PBFREE (Central Semiconductor Corp): Active product with extended lower operating temperature range (–65°C to 150°C). RoHS3 compliant.

Secondary Substitutes (Active Status, Minor Parameter Variations):

MMBT3906,215 (NXP Semiconductors): Active product with AEC-Q101 automotive qualification. Power rating reduced to 250 mW; suitable for applications not requiring full 350 mW dissipation.
PMBT3906,215 (NXP Semiconductors): Active product with AEC-Q101 automotive qualification. Identical electrical specifications to MMBT3906,215. Recommended for automotive applications.
MMBT3906-HF (Comchip Technology): Active product with Vce saturation reduced to 300 mV @ 5mA, 50mA. Beneficial for low-saturation applications.
SMMBT3906LT3G (onsemi): Active product with AEC-Q101 automotive qualification. Maintains full electrical equivalence with automotive-grade reliability.

Similar Parts (Parameter Deviations, Functional Compatibility):

BC807-16-7-F (Diodes Incorporated): Higher current rating (500 mA vs. 200 mA) and voltage rating (45 V vs. 40 V). Lower transition frequency (100 MHz vs. 250 MHz). Suitable for applications requiring higher current capacity where frequency performance is not critical.

Frequently Asked Questions (FAQ)

Q: Can MMBT3906-7-F directly replace MMBT3906 in all applications?

A: Yes. MMBT3906-7-F maintains identical electrical parameters (200 mA Ic, 40 V Vce(br), 250 MHz transition frequency, 100 hFE minimum) and uses the same SOT-23-3 package. The 300 mW power rating is sufficient for applications designed for the 350 mW original specification.

Q: What is the difference between MMBT3906,215 and PMBT3906,215?

A: Both parts are manufactured by NXP Semiconductors and maintain identical electrical specifications. MMBT3906,215 is designated as a small-signal transistor, while PMBT3906,215 carries the same functional classification. Both are AEC-Q101 qualified for automotive applications. Selection between them depends on supplier availability and specific procurement requirements.

Q: Why does MMBT3906-HF have a lower Vce saturation specification?

A: MMBT3906-HF (Comchip Technology) specifies 300 mV Vce saturation @ 5mA, 50mA compared to 400 mV for the original MMBT3906. This represents improved saturation performance and is not a limitation. Applications designed for the original 400 mV specification will operate with improved efficiency using MMBT3906-HF.

Q: Is MMBT3906-G a suitable substitute despite obsolete status?

A: MMBT3906-G (onsemi) is classified as obsolete and should not be selected for new designs or production. Although it maintains electrical compatibility, active alternatives with guaranteed long-term availability are preferred. Use MMBT3906-G only for repair of existing equipment where original part sourcing is impossible.

Q: Can BC807-16-7-F replace MMBT3906 in existing circuits?

A: BC807-16-7-F is not a direct substitute. It features higher collector current (500 mA vs. 200 mA), higher voltage rating (45 V vs. 40 V), and lower transition frequency (100 MHz vs. 250 MHz). Substitution is possible only in applications where the circuit design does not depend on the 250 MHz frequency performance and where the higher current rating does not introduce unintended circuit behavior.

Q: What packaging options are available for MMBT3906 substitutes?

A: All recommended substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, maintaining mechanical and electrical pin compatibility. Packaging variations exist only in tape and reel configurations (Cut Tape, Digi-Reel, Tape & Reel) for different manufacturing and assembly processes. The physical component dimensions and pinout remain identical across all substitutes.

Q: Which substitute offers the best long-term availability?

A: MMBT3906LT1G (onsemi) and MMBT3906-TP (Micro Commercial Co) offer the highest inventory levels (608,935 and 464,200 units respectively) and active product status. Both are suitable for long-term production commitments.

Q: Are all substitutes RoHS3 compliant?

A: All active substitutes listed are RoHS3 compliant except where noted. Verify specific compliance documentation with the supplier for applications requiring formal RoHS certification.

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