2N4401_D11Z Equivalent & Substitute Parts

Part Overview

The 2N4401_D11Z is a small-signal NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 600 mA, collector-emitter breakdown voltage of 40 V, and a transition frequency of 250 MHz, housed in a TO-92-3 through-hole package. The 2N4401_D11Z carries an obsolete product status, necessitating identification of active equivalent alternatives to ensure continued design support and component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	600	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	750 mV @ 50 mA, 500 mA	—
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150 mA, 1 V	—
Power - Max	625	mW
Frequency - Transition	250	MHz
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the 2N4401_D11Z is determined by electrical and mechanical parameter equivalence. All substitute parts must satisfy the following criteria:

Electrical Parameters (Critical for Functional Equivalence):

Transistor Type: NPN
Maximum Collector Current (Ic): 600 mA
Collector-Emitter Breakdown Voltage: 40 V
Vce Saturation: 750 mV @ 50 mA, 500 mA
DC Current Gain (hFE): Minimum 100 @ 150 mA, 1 V
Maximum Power Dissipation: 625 mW or greater
Transition Frequency: 250 MHz

Mechanical Parameters (Critical for Physical Compatibility):

Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA)

Substitute parts are classified into two categories: Direct Equivalents (identical electrical and mechanical specifications with active product status) and Similar Equivalents (matching electrical specifications with minor packaging variations or obsolete status).

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	hFE (Min)	Power (Max) mW	Frequency MHz	Package	Packaging Type
2N4401_D11Z	onsemi	Obsolete	600	40	100	625	250	TO-92-3	—
2N4401TA	onsemi	Active	600	40	100	625	250	TO-92-3	Cut Tape (CT)
2N4401TAR	onsemi	Active	600	40	100	625	250	TO-92-3	Cut Tape (CT)
2N4401TFR	onsemi	Active	600	40	100	625	250	TO-92-3	Cut Tape (CT)
2N4401TF	Fairchild Semiconductor	Active	600	40	100	625	250	TO-92-3	—
2N4401-AP	Micro Commercial Co	Obsolete	600	40	100	600	250	TO-92-3	Cut Tape (CT)

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents - Active Status):

The following parts provide direct electrical and mechanical equivalence with active product status and full compliance certifications:

2N4401TA (onsemi): Active product with ROHS3 compliance. Supplied in Cut Tape packaging. Inventory availability: 89,662 pieces.
2N4401TAR (onsemi): Active product with ROHS3 compliance. Supplied in Cut Tape packaging with formed leads. Inventory availability: 40,100 pieces.
2N4401TFR (onsemi): Active product with ROHS3 compliance. Supplied in Cut Tape packaging. Inventory availability: 24,100 pieces.
2N4401TF (Fairchild Semiconductor): Active product manufactured by Fairchild Semiconductor. Inventory availability: 2,100 pieces.

All primary substitutes maintain identical electrical specifications and TO-92-3 package compatibility. Selection among these options should be based on packaging format requirements (Cut Tape versus bulk), manufacturer preference, and inventory availability.

Secondary Substitute (Similar Equivalent - Obsolete Status):

2N4401-AP (Micro Commercial Co): Obsolete product with ROHS3 compliance. Electrical specifications match the main part with maximum power dissipation of 600 mW (versus 625 mW). Supplied in Cut Tape packaging with formed leads. Inventory availability: 15,326 pieces. This part is suitable for applications where the 25 mW power difference does not impact thermal design margins.

Frequently Asked Questions (FAQ)

Q: Can 2N4401TA, 2N4401TAR, and 2N4401TFR be used interchangeably with 2N4401_D11Z?

A: Yes. All three parts are direct electrical and mechanical equivalents of the 2N4401_D11Z. They share identical collector current, breakdown voltage, saturation characteristics, current gain, power rating, transition frequency, and TO-92-3 package configuration. The primary difference is packaging format (Cut Tape versus bulk) and product status (all three are active). Selection depends on procurement and assembly requirements.

Q: What is the difference between 2N4401TA and 2N4401TAR?

A: Both parts are manufactured by onsemi with identical electrical specifications and active product status. The primary distinction is that 2N4401TAR features formed leads, while 2N4401TA does not explicitly specify lead forming. Both are supplied in Cut Tape packaging. Consult specific datasheets for lead geometry details if lead forming is critical to assembly processes.

Q: Is 2N4401TF from Fairchild Semiconductor a suitable replacement?

A: Yes. The 2N4401TF maintains all electrical and mechanical specifications required for direct substitution. It is manufactured by Fairchild Semiconductor and carries active product status. This option is suitable when Fairchild Semiconductor components are preferred or specified in design documentation.

Q: Can 2N4401-AP be used as a substitute?

A: The 2N4401-AP is electrically compatible with the 2N4401_D11Z for most applications. It meets all electrical specifications with a maximum power dissipation of 600 mW (compared to 625 mW for the main part). This 25 mW difference is acceptable in applications where thermal margins are not critical. However, the 2N4401-AP carries obsolete product status, making it unsuitable for new production designs. It may be considered only for field replacements where inventory exists.

Q: What does "Cut Tape (CT)" packaging mean?

A: Cut Tape packaging refers to components supplied on carrier tape that has been cut into sections, typically containing 50 to 500 pieces per reel depending on component size. This format is standard for automated assembly processes. In contrast, components without specified packaging format may be supplied in bulk or alternative formats. Verify packaging requirements with procurement specifications before ordering.

Q: Are all substitute parts ROHS3 compliant?

A: The active substitute parts (2N4401TA, 2N4401TAR, 2N4401TFR) explicitly carry ROHS3 compliance certification. The 2N4401TF datasheet does not specify RoHS status in the provided parameters. The 2N4401-AP carries ROHS3 compliance but is obsolete. Confirm RoHS compliance status with the manufacturer or distributor if regulatory compliance is required for your application.

Q: What is the operating temperature range for these transistors?

A: All substitute parts operate across the temperature range of -55°C to 150°C (junction temperature). This range is identical to the 2N4401_D11Z and suitable for industrial and commercial applications.

Q: Can these transistors be used in surface-mount applications?

A: No. All parts in this equivalence group are through-hole components with TO-92-3 package configuration. They are designed for insertion into printed circuit boards with through-hole pads. Surface-mount alternatives require different package types (such as SOT-23) and are not covered in this equivalence guide.

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