2N4401_J25Z Equivalent & Substitute Parts

Part Overview

The 2N4401_J25Z 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. The component is housed in a TO-92-3 through-hole package suitable for through-hole PCB assembly.

The 2N4401_J25Z is classified as obsolete, which necessitates identification of equivalent substitute components. Active alternatives are available from the same manufacturer and other qualified suppliers, maintaining identical electrical and mechanical specifications while offering improved availability and current product support.

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

Substitute components for the 2N4401_J25Z are qualified based on strict equivalence across all electrical and mechanical parameters. The substitution criteria are:

Transistor Type: NPN configuration
Maximum Collector Current: 600 mA
Collector-Emitter Breakdown Voltage: 40 V
Saturation Voltage: 750 mV @ 50 mA, 500 mA
DC Current Gain (hFE): Minimum 100 @ 150 mA, 1 V
Maximum Power Dissipation: 625 mW
Transition Frequency: 250 MHz
Operating Temperature Range: -55°C to 150°C
Package Type: TO-92-3 through-hole configuration

All substitute parts listed maintain these specifications without deviation, ensuring direct functional and mechanical compatibility in existing circuit designs.

Parameter Comparison

Parameter	2N4401_J25Z (Main)	2N4401BU	2N4401TF
Manufacturer	onsemi	onsemi	Fairchild Semiconductor
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) Max	600 mA	600 mA	600 mA
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V
Vce Saturation (Max) @ Ib, Ic	750 mV @ 50 mA, 500 mA	750 mV @ 50 mA, 500 mA	750 mV @ 50 mA, 500 mA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150 mA, 1 V	100 @ 150 mA, 1 V	100 @ 150 mA, 1 V
Power - Max	625 mW	625 mW	625 mW
Frequency - Transition	250 MHz	250 MHz	250 MHz
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3

Engineering Selection Recommendations

2N4401BU (onsemi): This substitute is manufactured by onsemi, the original manufacturer of the 2N4401_J25Z. The 2N4401BU maintains active product status with current manufacturing support. This part is RoHS3 compliant and carries REACH unaffected status. Inventory availability is substantial at 9900 pieces. Selection of this part ensures continuity with the original manufacturer's quality standards and ongoing technical support.

2N4401TF (Fairchild Semiconductor): This substitute is manufactured by Fairchild Semiconductor and maintains active product status. The 2N4401TF is supplied with formed leads in the TO-92-3 package configuration. This part carries REACH unaffected status and EAR99 classification. Inventory availability is 2100 pieces. Selection of this part provides an alternative source from an established semiconductor manufacturer with equivalent electrical performance.

Both substitute parts are suitable for direct replacement in applications currently using the obsolete 2N4401_J25Z, with no circuit modifications required.

Frequently Asked Questions (FAQ)

Q: Can the 2N4401BU be used as a direct replacement for the 2N4401_J25Z?

A: Yes. The 2N4401BU is electrically and mechanically equivalent to the 2N4401_J25Z. All electrical parameters, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency are identical. Both components use the TO-92-3 through-hole package. No circuit modifications are required.

Q: What is the difference between the 2N4401BU and 2N4401TF?

A: Both parts are electrically equivalent with identical electrical specifications. The primary differences are manufacturer (onsemi versus Fairchild Semiconductor) and packaging designation (bulk versus formed leads). The 2N4401TF is supplied with formed leads, while the 2N4401BU is supplied in bulk packaging. Both are suitable for through-hole PCB assembly.

Q: Why is the 2N4401_J25Z classified as obsolete?

A: The 2N4401_J25Z is no longer in active production. However, equivalent active alternatives from the same manufacturer and other qualified suppliers are available with identical specifications and improved availability.

Q: Are there any compliance differences between the substitute parts?

A: The 2N4401BU is RoHS3 compliant. Compliance information for the 2N4401TF was not provided in the available data. Both parts carry REACH unaffected status and EAR99 classification. Verify specific compliance requirements for your application before final selection.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts use the TO-92-3 through-hole package with identical pin configuration and mechanical dimensions. Direct substitution is possible without PCB layout modifications. The 2N4401TF is supplied with formed leads, which may require different insertion techniques compared to standard leads, but the electrical and mechanical compatibility remains unchanged.

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

A: All three parts operate across a junction temperature range of -55°C to 150°C, providing performance across industrial and extended temperature applications.

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