MMBT3906_F080 Equivalent & Substitute Parts

Part Overview

The MMBT3906_F080 is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications in surface mount configurations. This device features a 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, and 250 MHz transition frequency in a compact SOT-23-3 package.

The MMBT3906_F080 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	200	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 50 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10 mA, 1 V	—
Power - Max	350	mW
Frequency - Transition	250	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBT3906_F080 are classified based on electrical and mechanical parameter compatibility. The following criteria determine substitution eligibility:

Primary Substitution Criteria:

Transistor Type: PNP
Current - Collector (Ic) (Max): 200 mA (minimum requirement)
Voltage - Collector Emitter Breakdown (Max): 40 V (minimum requirement)
Vce Saturation (Max) @ Ib, Ic: 400 mV @ 5 mA, 50 mA
DC Current Gain (hFE) (Min) @ Ic, Vce: 100 @ 10 mA, 1 V
Frequency - Transition: 250 MHz (minimum requirement)
Operating Temperature Range: -55°C to 150°C (minimum requirement)
Package / Case: SOT-23-3 compatible

Substitution Categories:

Direct Substitutes: Parts meeting all primary electrical parameters and package requirements with active product status or equivalent manufacturing lineage.

Upgrade Substitutes: Parts exceeding primary specifications while maintaining backward compatibility, offering enhanced reliability or compliance certifications.

Similar Substitutes: Parts with comparable electrical performance but minor parameter variations, suitable for applications with relaxed specifications or where parameter derating is acceptable.

Parameter Comparison

Parameter	MMBT3906_F080	MMBT3906LT1G	CMPT3906G TR PBFREE	BCW61BE6327HTSA1	MMBT3906-G	MMBT3906-TP
Manufacturer	onsemi	onsemi	Central Semiconductor Corp	Infineon Technologies	onsemi	Micro Commercial Co
Product Status	Obsolete	Active	Active	Obsolete	Obsolete	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	200 mA	200 mA	200 mA	100 mA	200 mA	200 mA
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V	32 V	40 V	40 V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 50 mA	400 mV @ 5 mA, 50 mA	400 mV @ 5 mA, 50 mA	550 mV @ 1.25 mA, 50 mA	400 mV @ 5 mA, 50 mA	400 mV @ 5 mA, 50 mA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10 mA, 1 V	100 @ 10 mA, 1 V	100 @ 10 mA, 1 V	180 @ 2 mA, 5 V	100 @ 10 mA, 1 V	100 @ 10 mA, 1 V
Power - Max	350 mW	300 mW	350 mW	330 mW	200 mW	300 mW
Frequency - Transition	250 MHz	250 MHz	250 MHz	250 MHz	300 MHz	250 MHz
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-65 to 150°C	to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23	SOT-23-3	SOT-23-3	SOT-23
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—	1 (Unlimited)

Engineering Selection Recommendations

MMBT3906LT1G (Direct Substitute - Recommended)

The MMBT3906LT1G is the primary recommended substitute for the MMBT3906_F080. This part maintains identical electrical specifications across all critical parameters: 200 mA collector current, 40 V breakdown voltage, 400 mV saturation voltage, 100 hFE minimum, and 250 MHz transition frequency. The MMBT3906LT1G carries active product status from onsemi, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant with MSL 1 rating, providing superior environmental and moisture handling characteristics compared to the obsolete original. The 300 mW power rating represents a minor reduction from 350 mW but remains adequate for applications designed within the original 350 mW specification envelope.

MMBT3906-TP (Direct Substitute - Alternative)

The MMBT3906-TP from Micro Commercial Co provides full electrical equivalence to the MMBT3906_F080 with identical specifications across all primary parameters. This part maintains active product status and ROHS3 compliance with MSL 1 rating. The MMBT3906-TP is supplied in Tape & Reel packaging with 464,200 pieces in stock, offering exceptional availability for high-volume production requirements.

CMPT3906G TR PBFREE (Upgrade Substitute)

The CMPT3906G TR PBFREE from Central Semiconductor Corp exceeds the original specification with identical electrical performance and an extended operating temperature range of -65°C to 150°C compared to -55°C to 150°C. This part maintains 350 mW power rating matching the original specification. ROHS3 compliance and MSL 1 rating provide enhanced reliability. The CMPT3906G TR PBFREE is suitable for applications requiring extended low-temperature operation or enhanced environmental compliance.

BCW61BE6327HTSA1 (Similar Substitute - Limited Application)

The BCW61BE6327HTSA1 from Infineon Technologies exhibits reduced electrical specifications: 100 mA maximum collector current (versus 200 mA) and 32 V breakdown voltage (versus 40 V). The higher saturation voltage of 550 mV and elevated DC current gain of 180 hFE represent parameter deviations. This part is classified as obsolete. Substitution is limited to applications where current and voltage requirements do not exceed the reduced specifications and where the parameter variations are acceptable.

MMBT3906-G (Similar Substitute - Limited Application)

The MMBT3906-G from onsemi maintains 200 mA collector current and 40 V breakdown voltage but exhibits reduced power dissipation of 200 mW (versus 350 mW) and elevated transition frequency of 300 MHz. The part is classified as obsolete. Substitution is suitable only for applications operating within the 200 mW power envelope where the higher frequency capability does not introduce instability.

Frequently Asked Questions (FAQ)

Q: Can MMBT3906LT1G directly replace MMBT3906_F080 in existing designs?

A: Yes. The MMBT3906LT1G maintains electrical equivalence across all critical parameters: collector current, breakdown voltage, saturation voltage, current gain, and transition frequency. The SOT-23-3 package is mechanically identical. The 300 mW power rating is lower than the original 350 mW specification; verify that circuit power dissipation does not exceed 300 mW under worst-case operating conditions.

Q: What is the difference between MMBT3906-TP and MMBT3906LT1G?

A: Both parts provide identical electrical specifications and active product status. The primary differences are manufacturer (Micro Commercial Co versus onsemi) and packaging format (Tape & Reel versus Cut Tape & Digi-Reel). Selection depends on procurement requirements and packaging preferences. MMBT3906-TP offers higher inventory availability.

Q: Is CMPT3906G TR PBFREE suitable for applications requiring -55°C minimum operating temperature?

A: Yes. The CMPT3906G TR PBFREE operates from -65°C to 150°C, exceeding the -55°C to 150°C requirement of the original MMBT3906_F080. This part is suitable for all temperature ranges specified for the original device.

Q: Why is BCW61BE6327HTSA1 listed as a similar substitute rather than a direct substitute?

A: The BCW61BE6327HTSA1 exhibits reduced electrical specifications: maximum collector current of 100 mA (versus 200 mA) and breakdown voltage of 32 V (versus 40 V). These reductions limit substitution to applications where circuit current and voltage requirements do not exceed the reduced specifications. The higher saturation voltage and different current gain characteristics also represent parameter deviations.

Q: Can MMBT3906-G be used in high-frequency applications?

A: The MMBT3906-G exhibits 300 MHz transition frequency, exceeding the 250 MHz specification of the original MMBT3906_F080. However, the reduced 200 mW power rating limits substitution to applications operating within this power envelope. Verify that circuit power dissipation does not exceed 200 mW under worst-case conditions. The higher frequency capability may introduce oscillation in circuits designed for 250 MHz operation; circuit stability analysis is required.

Q: Are all substitute parts ROHS3 compliant?

A: MMBT3906LT1G, CMPT3906G TR PBFREE, BCW61BE6327HTSA1, and MMBT3906-TP are ROHS3 compliant. MMBT3906-G does not have applicable RoHS status. Verify compliance requirements for your specific application before selection.

Q: What is the MSL rating significance for these parts?

A: MSL 1 (Unlimited) rating indicates that parts have unlimited shelf life without moisture bake requirements. MMBT3906LT1G, CMPT3906G TR PBFREE, BCW61BE6327HTSA1, and MMBT3906-TP all carry MSL 1 rating, providing superior moisture handling and storage flexibility compared to higher MSL classifications.

Q: Is the SOT-23 package identical to SOT-23-3?

A: SOT-23 and SOT-23-3 refer to the same three-lead surface mount package. Both designations are used interchangeably in industry documentation. All listed substitute parts are mechanically compatible with the original SOT-23-3 package footprint.

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