MMBT3906SL Equivalent & Substitute Parts

Part Overview

The MMBT3906SL is a Surface Mount PNP Bipolar Junction Transistor (BJT) manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 40 V collector-emitter breakdown voltage rating and supports collector currents up to 200 mA with a transition frequency of 250 MHz. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and procurement needs.

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	227	mW
Frequency - Transition	250	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-923F	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBT3906SL is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor polarity: PNP configuration
Maximum collector current: 200 mA
Collector-emitter breakdown voltage: 40 V
Vce saturation characteristics: 400 mV @ 5 mA, 50 mA
DC current gain (hFE): minimum 100 @ 10 mA, 1 V
Transition frequency: 250 MHz

Mechanical and Compliance Criteria:

Surface Mount mounting type
RoHS3 compliance
Moisture Sensitivity Level 1 (Unlimited)
REACH Unaffected status
ECCN EAR99 classification

The NST3906F3T5G meets all electrical specifications and compliance requirements. Differences in package type (SOT-1123 versus SOT-923F), power dissipation rating (290 mW versus 227 mW), and operating temperature range do not preclude substitution when the application circuit design accommodates these variations.

Parameter Comparison

Parameter	MMBT3906SL	NST3906F3T5G	Match Status
Manufacturer	onsemi	onsemi	Identical
Transistor Type	PNP	PNP	Identical
Current - Collector (Ic) (Max)	200 mA	200 mA	Identical
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	Identical
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 50 mA	400 mV @ 5 mA, 50 mA	Identical
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10 mA, 1 V	100 @ 10 mA, 1 V	Identical
Frequency - Transition	250 MHz	250 MHz	Identical
Power - Max	227 mW	290 mW	Substitute Higher
Operating Temperature (TJ)	150°C	−55°C to 150°C	Substitute Wider Range
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	SOT-923F	SOT-1123	Different
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The NST3906F3T5G is a direct electrical equivalent to the MMBT3906SL across all specified performance parameters. Selection of this substitute is supported by the following factors:

Product Status: The NST3906F3T5G maintains Active product status, ensuring continued availability and manufacturer support, whereas the MMBT3906SL is classified as Obsolete.

Compliance Alignment: Both devices maintain identical RoHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 ratings, ensuring regulatory and environmental compatibility.

Electrical Performance: All critical electrical parameters—collector current, breakdown voltage, saturation characteristics, current gain, and transition frequency—are identical between the two devices.

Physical Considerations: The NST3906F3T5G utilizes the SOT-1123 package instead of the SOT-923F package. PCB layout modifications are required to accommodate the different package footprint. The substitute device offers a higher power dissipation rating (290 mW versus 227 mW) and an extended operating temperature range (−55°C to 150°C versus 150°C maximum), both of which provide additional design margin.

Packaging Format: The NST3906F3T5G is supplied in Tape & Reel (TR) format, whereas the MMBT3906SL packaging format is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can the NST3906F3T5G be used as a direct replacement for the MMBT3906SL in existing circuit designs?

A: The NST3906F3T5G is electrically equivalent across all specified performance parameters. However, the different package type (SOT-1123 versus SOT-923F) requires PCB layout modifications. The substitute device must be evaluated for physical fit within the available board space and thermal management requirements of the application.

Q: What is the primary reason for substituting the MMBT3906SL?

A: The MMBT3906SL is classified as Obsolete. The NST3906F3T5G is an Active product from the same manufacturer, ensuring long-term availability and continued support.

Q: Are there any electrical performance differences between these devices?

A: No. Both devices share identical specifications for collector current (200 mA), breakdown voltage (40 V), saturation voltage (400 mV @ 5 mA, 50 mA), current gain (100 @ 10 mA, 1 V), and transition frequency (250 MHz).

Q: How do the package differences affect substitution?

A: The NST3906F3T5G uses the SOT-1123 package, which differs physically from the SOT-923F package of the MMBT3906SL. PCB footprint redesign is necessary. The substitute package may offer different thermal characteristics and board space requirements.

Q: Does the higher power rating of the NST3906F3T5G affect compatibility?

A: The NST3906F3T5G has a maximum power dissipation of 290 mW compared to 227 mW for the MMBT3906SL. This higher rating provides additional thermal margin and does not negatively impact compatibility. Applications designed for the lower rating remain compatible.

Q: What is the operating temperature range difference?

A: The MMBT3906SL operates to a maximum junction temperature of 150°C. The NST3906F3T5G operates from −55°C to 150°C, providing an extended lower temperature range. This expanded range does not affect compatibility for applications within the original device's temperature specification.

Q: Are compliance certifications identical between the two devices?

A: Yes. Both devices are ROHS3 Compliant, REACH Unaffected, and carry Moisture Sensitivity Level 1 (Unlimited) ratings. Regulatory and environmental compliance requirements are fully satisfied by the substitute device.

Q: What packaging format is the NST3906F3T5G supplied in?

A: The NST3906F3T5G is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

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