FFB3906 Equivalent & Substitute Parts

Part Overview

The FFB3906 is a dual PNP bipolar junction transistor (BJT) array manufactured by onsemi in a 6-pin surface mount SC-88/SC-70-6 package. This component is classified as obsolete, indicating that onsemi has discontinued production. The FFB3906 operates at a maximum collector current of 200mA, collector-emitter breakdown voltage of 40V, and maximum power dissipation of 300mW with a transition frequency of 200MHz.

Due to the obsolete status of the FFB3906, equivalent substitute parts from active manufacturers are necessary for new designs, production continuations, and component replenishment. Suitable alternatives maintain the same electrical specifications and package compatibility while offering active product status and improved availability.

Key Parameters

Parameter	FFB3906 Specification
Transistor Type	2 PNP (Dual)
Current - Collector (Ic) (Max)	200mA
Voltage - Collector Emitter Breakdown (Max)	40V
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V
Power - Max	300mW
Frequency - Transition	200MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	6-TSSOP, SC-88, SOT-363
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the FFB3906 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor Type: 2 PNP (Dual) configuration
Current - Collector (Ic) (Max): 200mA
Voltage - Collector Emitter Breakdown (Max): 40V
Vce Saturation (Max) @ Ib, Ic: 400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce: 100 @ 10mA, 1V
Package / Case: 6-TSSOP, SC-88, SOT-363 (surface mount)
Mounting Type: Surface Mount

All substitute parts listed maintain these critical electrical specifications. Variations in maximum power dissipation (150mW to 350mW) and transition frequency (250MHz) represent improvements over the original FFB3906 specifications and do not restrict substitution. Operating temperature ranges may vary between -55°C and -65°C minimum, with all parts supporting the 150°C maximum requirement.

Parameter Comparison

Parameter	FFB3906	MBT3906DW1T1G	CMKT3906 TR PBFREE	DMMT3906-TP	DMMT3906W-7-F	MMDT3906-7-F	PMBT3906YS,115
Manufacturer	onsemi	onsemi	Central Semiconductor Corp	Micro Commercial Co	Diodes Incorporated	Diodes Incorporated	Nexperia USA Inc.
Transistor Type	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual) Matched Pair	2 PNP (Dual) Matched Pair	2 PNP (Dual)	2 PNP (Dual)
Current - Collector (Ic) (Max)	200mA	200mA	200mA	200mA	200mA	200mA	200mA
Voltage - Collector Emitter Breakdown (Max)	40V	40V	40V	40V	40V	40V	40V
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V
Power - Max	300mW	150mW	350mW	200mW	200mW	200mW	350mW
Frequency - Transition	200MHz	250MHz	250MHz	250MHz	250MHz	250MHz	250MHz
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	150°C (Max)
Package / Case	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MBT3906DW1T1G

The MBT3906DW1T1G from onsemi is the direct successor to the FFB3906. This part maintains identical electrical specifications and is manufactured by the same original equipment manufacturer. The MBT3906DW1T1G carries active product status with ROHS3 compliance and significantly higher inventory availability (125,300 units in stock). This part is suitable for direct replacement in all applications where the FFB3906 was previously specified.

Secondary Recommendations:

DMMT3906W-7-F (Diodes Incorporated) and DMMT3906-TP (Micro Commercial Co) are dual PNP matched pair variants. These parts provide enhanced performance characteristics with matched transistor pairs, beneficial for differential amplifier and precision analog circuit applications. Both maintain all critical electrical parameters and offer active product status with ROHS3 compliance.

MMDT3906-7-F (Diodes Incorporated) is a standard dual PNP configuration with active product status and high inventory availability (56,100 units). This part is suitable for general-purpose applications requiring no matched pair characteristics.

CMKT3906 TR PBFREE (Central Semiconductor Corp) and PMBT3906YS,115 (Nexperia USA Inc.) are alternative sources with active product status and ROHS3 compliance. The PMBT3906YS,115 carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications.

All listed substitutes are electrically compatible with the FFB3906 and support the same 6-TSSOP/SC-88/SOT-363 surface mount package footprint.

Frequently Asked Questions (FAQ)

Q: Can the MBT3906DW1T1G be used as a direct replacement for the FFB3906?

A: Yes. The MBT3906DW1T1G maintains identical electrical specifications including collector current (200mA), collector-emitter breakdown voltage (40V), saturation voltage (400mV @ 5mA, 50mA), and DC current gain (100 @ 10mA, 1V). Both parts use the same 6-TSSOP/SC-88/SOT-363 surface mount package. The MBT3906DW1T1G is the active product successor from the same manufacturer.

Q: What is the difference between standard dual PNP parts and matched pair variants?

A: Standard dual PNP parts (MMDT3906-7-F, MBT3906DW1T1G) contain two independent transistors with typical manufacturing tolerances. Matched pair variants (DMMT3906W-7-F, DMMT3906-TP) are specifically selected and tested to ensure close parameter matching between the two transistors. Matched pairs are required for differential amplifier circuits, precision analog applications, and balanced signal processing where transistor parameter tracking is critical.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitute parts use the 6-TSSOP/SC-88/SOT-363 surface mount package, which shares identical pin configuration and PCB footprint. No PCB layout modifications are required when substituting between these parts.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates that the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of lead and other hazardous materials. All active substitute parts listed carry ROHS3 compliance, making them suitable for applications subject to environmental and regulatory requirements. The obsolete FFB3906 does not specify ROHS compliance status.

Q: Why do some substitute parts have higher maximum power ratings than the FFB3906?

A: Substitute parts such as CMKT3906 TR PBFREE and PMBT3906YS,115 specify 350mW maximum power dissipation compared to the FFB3906's 300mW. This represents an improvement in thermal performance and does not restrict substitution. Parts with higher power ratings can safely operate in applications designed for lower power dissipation.

Q: Is the PMBT3906YS,115 suitable for automotive applications?

A: Yes. The PMBT3906YS,115 carries AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and quality standards. This part is suitable for automotive-grade applications requiring qualified components.

Q: What inventory considerations should guide part selection?

A: The MBT3906DW1T1G offers the highest inventory availability at 125,300 units in stock, followed by MMDT3906-7-F at 56,100 units and DMMT3906W-7-F at 35,200 units. For applications requiring immediate availability or high-volume production, these parts are preferred. CMKT3906 TR PBFREE and DMMT3906-TP offer lower inventory levels (762 and 716 units respectively) and may require longer lead times for large orders.

Q: Can the FFB3906 be used interchangeably with NPN transistor arrays?

A: No. The FFB3906 is a PNP transistor array and cannot be substituted with NPN variants. PNP and NPN transistors have opposite polarity requirements and cannot function interchangeably in circuit designs. Circuit topology and biasing must be designed specifically for PNP or NPN operation.

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