2N4401_J18Z Equivalent & Substitute Parts

Part Overview

The 2N4401_J18Z is a small-signal NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The 2N4401 base product series maintains consistent electrical and mechanical specifications across multiple manufacturer variants and packaging configurations, enabling direct substitution within the defined parameter envelope.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Ic) Maximum	600	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Vce Saturation (Max)	750 mV @ 50 mA, 500 mA	—
DC Current Gain (hFE) Minimum	100 @ 150 mA, 1 V	—
Power Dissipation Maximum	625	mW
Transition Frequency	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_J18Z is determined by electrical parameter equivalence and mechanical compatibility. All substitute parts maintain identical specifications for collector current (600 mA), collector-emitter breakdown voltage (40 V), saturation voltage characteristics, DC current gain (100 @ 150 mA, 1 V), power dissipation (625 mW), transition frequency (250 MHz), and operating temperature range (−55 to 150 °C). All substitute parts utilize the same through-hole TO-92-3 package configuration.

The primary distinction among substitute options is product status and packaging format. The 2N4401_J18Z is obsolete; active alternatives are available from onsemi (2N4401TA, 2N4401TAR, 2N4401TFR) and Fairchild Semiconductor (2N4401TF). Packaging variants include cut tape (CT) and tube formats. These differences do not affect electrical performance or functional compatibility in circuit applications.

Parameter Comparison

Parameter	2N4401_J18Z	2N4401TA	2N4401TAR	2N4401TF	2N4401TFR
Manufacturer	onsemi	onsemi	onsemi	Fairchild Semiconductor	onsemi
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN
Ic (Max)	600 mA	600 mA	600 mA	600 mA	600 mA
Vce Breakdown (Max)	40 V	40 V	40 V	40 V	40 V
Vce Saturation (Max)	750 mV @ 50 mA, 500 mA	750 mV @ 50 mA, 500 mA	750 mV @ 50 mA, 500 mA	750 mV @ 50 mA, 500 mA	750 mV @ 50 mA, 500 mA
hFE (Min)	100 @ 150 mA, 1 V	100 @ 150 mA, 1 V	100 @ 150 mA, 1 V	100 @ 150 mA, 1 V	100 @ 150 mA, 1 V
Power (Max)	625 mW	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	250 MHz	250 MHz	250 MHz	250 MHz	250 MHz
Operating Temperature	−55 to 150 °C	−55 to 150 °C	−55 to 150 °C	−55 to 150 °C	−55 to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 2N4401_J18Z. Selection among active alternatives should prioritize product status and compliance certifications.

onsemi variants (2N4401TA, 2N4401TAR, 2N4401TFR): These parts are manufactured by onsemi, the original manufacturer of the 2N4401_J18Z. All three are active products with ROHS3 compliance and REACH unaffected status. The 2N4401TA and 2N4401TAR are supplied in cut tape packaging with formed leads. The 2N4401TFR is supplied in cut tape format. Inventory availability is substantial across all three variants (89,662 pcs, 40,100 pcs, and 24,100 pcs respectively).

Fairchild Semiconductor variant (2N4401TF): This part is an active product manufactured by Fairchild Semiconductor. It maintains identical electrical specifications and TO-92-3 package configuration. Inventory availability is 2,100 pcs. Compliance certifications are not specified in the provided data.

For new designs and production applications requiring the 2N4401 specification, onsemi active variants provide continuity with the original manufacturer and documented compliance status. Fairchild Semiconductor 2N4401TF is available as an alternative source option.

Frequently Asked Questions (FAQ)

Q: Can the 2N4401_J18Z be directly replaced with any of the listed substitute parts?

A: Yes. All substitute parts (2N4401TA, 2N4401TAR, 2N4401TF, 2N4401TFR) are electrically and mechanically equivalent. They share identical collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, transition frequency, and operating temperature specifications. All utilize the same TO-92-3 through-hole package.

Q: What is the difference between 2N4401TA, 2N4401TAR, and 2N4401TFR?

A: These three onsemi variants differ only in packaging format and lead configuration. 2N4401TA and 2N4401TAR are supplied in cut tape with formed leads. 2N4401TFR is supplied in cut tape format. Electrical performance is identical across all three.

Q: Why is the 2N4401_J18Z listed as obsolete?

A: The 2N4401_J18Z is classified as obsolete by onsemi. Active alternatives from the same manufacturer and other sources are available to support ongoing applications and new designs.

Q: Are there any compliance or certification differences among the substitute parts?

A: onsemi variants (2N4401TA, 2N4401TAR, 2N4401TFR) are documented as ROHS3 compliant with REACH unaffected status. Compliance information for the Fairchild Semiconductor 2N4401TF is not provided in the available data.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (cut tape, tube, or other distribution method) does not affect electrical performance or functional compatibility. All substitute parts in the TO-92-3 package are mechanically and electrically interchangeable.

Q: Which substitute part should be selected for new production?

A: For new production, select from active onsemi variants (2N4401TA, 2N4401TAR, or 2N4401TFR) to maintain continuity with the original manufacturer and documented compliance certifications. The Fairchild Semiconductor 2N4401TF is available as an alternative source.

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