2N3906_D81Z Equivalent & Substitute Parts

Part Overview

The 2N3906_D81Z is a PNP bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 200 mA maximum collector current. This device is packaged in TO-92-3 through-hole configuration and is suitable for general-purpose switching and amplification applications operating across a temperature range of -55°C to 150°C.

The 2N3906_D81Z carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or repair requirements for legacy systems utilizing this component.

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	625	mW
Frequency - Transition	250	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	—

Substitute Part Grouping Explanation

Substitution of the 2N3906_D81Z is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Transistor Type: PNP
Maximum Collector Current (Ic): 200 mA
Maximum Collector-Emitter Breakdown Voltage: 40 V
Vce Saturation: 400 mV @ 5 mA, 50 mA
Minimum DC Current Gain (hFE): 100 @ 10 mA, 1 V
Maximum Power Dissipation: 625 mW (or higher)
Transition Frequency: 250 MHz
Operating Temperature Range: -55°C to 150°C
Mounting Type: Through Hole
Package: TO-92-3 or equivalent TO-226-3 configuration

All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the 2N3906_D81Z. Substitutes differ only in manufacturer identity, packaging format (bulk versus cut tape), and product status (active versus obsolete).

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) [mA]	Vce Breakdown (Max) [V]	Vce Sat (Max) [mV]	hFE (Min)	Power (Max) [mW]	Frequency [MHz]	Temp Range [°C]	Package	Packaging Format
2N3906_D81Z	onsemi	Obsolete	200	40	400	100	625	250	-55 to 150	TO-92-3	—
2N3906TA	Fairchild Semiconductor	Active	200	40	400	100	625	250	-55 to 150	TO-92-3	Bulk
2N3906TAR	onsemi	Active	200	40	400	100	625	250	-55 to 150	TO-92-3	Cut Tape (CT)
2N3906TF	onsemi	Active	200	40	400	100	625	250	-55 to 150	TO-92-3	Cut Tape (CT)
2N3906TFR	onsemi	Active	200	40	400	100	625	250	-55 to 150	TO-92-3	Cut Tape (CT)
2N3906-AP	Micro Commercial Co	Obsolete	200	40	400	100	600	250	-55 to 150	TO-92	Cut Tape (CT)

Engineering Selection Recommendations

Active Status Substitutes (Preferred):

The 2N3906TA (Fairchild Semiconductor), 2N3906TAR, 2N3906TF, and 2N3906TFR (all onsemi) are active products with current manufacturing status. These parts are electrically and mechanically equivalent to the 2N3906_D81Z and are recommended for new designs and ongoing production applications. The onsemi variants (2N3906TAR, 2N3906TF, 2N3906TFR) carry RoHS3 compliance certification, supporting modern environmental and regulatory requirements.

Obsolete Status Substitutes (Limited Application):

The 2N3906-AP (Micro Commercial Co) maintains electrical equivalence but carries obsolete product status. This part is suitable only for legacy system repairs or applications where existing inventory is available. The 2N3906-AP exhibits a maximum power rating of 600 mW, which is 25 mW lower than the primary specification, though this difference does not affect functional substitution within the stated electrical parameters.

Packaging and Compliance Considerations:

All substitute parts maintain TO-92-3 through-hole package compatibility with the 2N3906_D81Z. The onsemi cut-tape variants (2N3906TAR, 2N3906TF, 2N3906TFR) are ROHS3 compliant and carry not-applicable moisture sensitivity levels, supporting integration into modern manufacturing environments. The Fairchild 2N3906TA is available in bulk packaging format, suitable for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can the 2N3906TA be used as a direct replacement for the 2N3906_D81Z?

A: Yes. The 2N3906TA is electrically and mechanically equivalent. Both devices share identical maximum collector current (200 mA), collector-emitter breakdown voltage (40 V), saturation voltage (400 mV @ 5 mA, 50 mA), DC current gain (100 @ 10 mA, 1 V), power dissipation (625 mW), transition frequency (250 MHz), and operating temperature range (-55°C to 150°C). Both are packaged in TO-92-3 through-hole configuration. The 2N3906TA is an active product, making it suitable for new designs and ongoing production.

Q: What is the difference between 2N3906TAR, 2N3906TF, and 2N3906TFR?

A: All three parts are manufactured by onsemi and are electrically identical to the 2N3906_D81Z. The differences are limited to packaging format (all supplied in cut tape) and inventory availability. All three carry active product status and RoHS3 compliance. Selection among these variants is determined by procurement requirements and available inventory levels.

Q: Is the 2N3906-AP suitable for new designs?

A: The 2N3906-AP carries obsolete product status and is not recommended for new designs. This part is suitable only for legacy system repairs or applications where existing inventory is available. For new designs, select from the active-status alternatives: 2N3906TA, 2N3906TAR, 2N3906TF, or 2N3906TFR.

Q: Does the 600 mW power rating of the 2N3906-AP affect its substitution capability?

A: No. The 2N3906-AP maximum power rating of 600 mW is lower than the 625 mW specification of the 2N3906_D81Z by 25 mW. However, this difference does not affect functional substitution within the stated electrical parameters. The 2N3906-AP remains electrically equivalent across all other critical specifications. Designers must verify that application power dissipation does not exceed 600 mW when using this variant.

Q: Are all substitute parts RoHS compliant?

A: The onsemi variants (2N3906TAR, 2N3906TF, 2N3906TFR) are explicitly RoHS3 compliant. The Fairchild 2N3906TA and Micro Commercial Co 2N3906-AP do not list RoHS status in the provided specifications. For applications requiring RoHS compliance certification, select from the onsemi active-status variants.

Q: Can these parts be used interchangeably in existing circuit boards?

A: Yes. All substitute parts maintain identical TO-92-3 through-hole package configuration with formed leads, ensuring mechanical and electrical compatibility with existing printed circuit board layouts designed for the 2N3906_D81Z. No circuit board modifications are required.

Q: What is the moisture sensitivity level of the substitute parts?

A: The onsemi variants (2N3906TAR, 2N3906TF, 2N3906TFR) carry not-applicable moisture sensitivity levels, indicating no moisture-related handling restrictions. The 2N3906_D81Z carries MSL 1 (unlimited), and the 2N3906TA does not specify MSL status. All parts are suitable for standard handling and storage conditions.

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