2N4401-AP Equivalent & Substitute Parts

Part Overview

The 2N4401-AP is a small-signal NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device features a 40 V collector-emitter breakdown voltage, 250 MHz transition frequency, and 600 mW maximum power dissipation in a through-hole TO-92 package. The 2N4401-AP is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and maintenance applications. Substitute parts must maintain electrical and mechanical compatibility while offering current product availability.

Substiute Parts

2N4401-AP

Micro Commercial CoIn Stock: 154062N4401-AP Datasheet

Current PartRFQ

2N4401TA

onsemiIn Stock: 896882N4401TA Datasheet

SimilarRFQ

2N4401TF

Fairchild SemiconductorIn Stock: 21252N4401TF Datasheet

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2N4401TFR

onsemiIn Stock: 241262N4401TFR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 2N4401-AP are qualified based on the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Transistor type: NPN configuration
• Voltage - Collector Emitter Breakdown (Max): 40 V minimum
• DC Current Gain (hFE) (Min): 100 @ 150mA, 1V
• Vce Saturation (Max): 750mV @ 50mA, 500mA
• Frequency - Transition: 250 MHz minimum
• Operating Temperature Range: -55°C to 150°C

Mechanical Compatibility Criteria:

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

All substitute parts listed maintain identical electrical specifications and package configuration, ensuring direct functional replacement in existing circuit designs. Substitutes are selected from active product lines to ensure long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

2N4401TA (onsemi) is an active substitute offering identical electrical parameters and TO-92-3 package configuration. This part maintains ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original 2N4401-AP. Current inventory availability supports production requirements.

2N4401TF (Fairchild Semiconductor) is an active substitute with matching electrical specifications and through-hole TO-92-3 package. This part provides an alternative sourcing option with current product status and established supply availability.

2N4401TFR (onsemi) is an active substitute with identical electrical parameters, TO-92-3 package configuration, and ROHS3 compliance. This part offers the highest current inventory level among available substitutes and maintains REACH unaffected status.

All three substitute parts are electrically and mechanically interchangeable with the 2N4401-AP. Selection between substitutes should be based on supplier availability, lead time requirements, and procurement preferences. The 2N4401-AP base product number is shared across all substitute variants, confirming design compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 2N4401TA, 2N4401TF, or 2N4401TFR be used as direct replacements for the 2N4401-AP?

A: Yes. All three substitute parts maintain identical electrical specifications including 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 250 MHz transition frequency, and 100 minimum DC current gain. All are packaged in TO-92-3 through-hole configuration, enabling direct board-level substitution.

Q: What is the primary difference between the substitute parts?

A: The substitute parts differ by manufacturer and product status. The 2N4401TA and 2N4401TFR are manufactured by onsemi and carry active product status. The 2N4401TF is manufactured by Fairchild Semiconductor and also carries active product status. All maintain identical electrical and mechanical specifications.

Q: Are there compliance differences between the 2N4401-AP and its substitutes?

A: The 2N4401TA and 2N4401TFR maintain ROHS3 compliance and REACH unaffected status identical to the original 2N4401-AP. Compliance documentation for the 2N4401TF should be verified with the manufacturer.

Q: Does the slightly higher maximum power rating (625 mW vs. 600 mW) of the substitutes affect circuit design?

A: No. The substitute parts' 625 mW maximum power rating exceeds the original 2N4401-AP specification of 600 mW, providing additional thermal margin. This represents an improvement in thermal performance and does not require circuit redesign.

Q: What packaging format is used for these substitutes?

A: All substitute parts are supplied in TO-92-3 through-hole package with formed leads (TO-226AA). This package configuration is identical to the original 2N4401-AP, ensuring compatibility with existing printed circuit board layouts and assembly processes.

Q: Which substitute offers the best supply availability?

A: The 2N4401TFR (onsemi) currently maintains the highest inventory level at 24,100 pieces. The 2N4401TA (onsemi) provides 89,662 pieces in stock. The 2N4401TF (Fairchild Semiconductor) maintains 2,100 pieces in inventory.