onsemi 2N4401_J05Z

Overview

2N4401_J05Z from ON Semiconductor is a TO-92 packaged NPN bipolar junction transistor designed for medium-power amplification and switching applications with 40 V V_CEO, 600 mA I_C, and 625 mW power dissipation at 25°C. It delivers DC current gain (h_FE) of 100 at 150 mA collector current and supports fast switching with 15 ns delay time and 30 ns fall time, commonly used in relay drivers and signal amplification stages.

For engineers reviewing the 2N4401_J05Z datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 mechanical compatibility, guaranteed h_FE ≥ 40 at 1 mA, V_CE(sat) ≤ 0.75 V at 500 mA, thermal resistance R_θJA = 200 °C/W, and suitability for linear amplification or saturated-switching topologies.

Technical Context

The 2N4401_J05Z operates as a single NPN BJT with fixed emitter-base and collector-base junctions, supporting common-emitter, common-base, and common-collector configurations. Its design targets general-purpose analog amplification and digital switching where moderate speed, low saturation voltage, and predictable DC gain are required.

It features a maximum junction temperature of 150°C, absolute ratings including 60 V V_CBO, 6 V V_EBO, and 40 V V_CEO, and exhibits f_T = 250 MHz at 20 mA/10 V - confirming usable RF capability up to low-VHF bands when biased appropriately.

Key Specifications

Pinout & Package

2N4401_J05Z uses the JEDEC TO-92 3-lead through-hole package with straight leads (bulk or ammo packing). Pin identification follows standard orientation: viewed from flat side with leads down, left-to-right is Emitter (E), Base (B), Collector (C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Compared with MMBT4401 and 2N2222A, the 2N4401_J05Z offers superior thermal performance in through-hole designs, tighter h_FE consistency above 100 mA, and faster turn-off - making it optimal for thermally demanding relay and motor driver applications where TO-92 mounting is acceptable.

Availability

2N4401_J05Z is available at Aetrix Electronics and suitable for relay driver circuits, LED current switches, audio pre-amplifier stages, and logic-level translators requiring stable component supply and long-term manufacturability.

Supply support for 2N4401_J05Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (now onsemi) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and consumer markets.

The 2N4401_J05Z belongs to ON Semiconductor's legacy general-purpose bipolar transistor family, engineered for cost-sensitive, high-reliability discrete switching and amplification in industrial controls and legacy equipment replacement.

FAQ

What is the maximum continuous collector current rating for the 2N4401_J05Z?

The 2N4401_J05Z has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This rating decreases linearly with rising ambient temperature due to its 5.0 mW/°C derating factor. At 75°C ambient, the usable I_C drops to approximately 350 mA. Always verify thermal design margins using R_θJA = 200 °C/W and actual board layout.

Does the 2N4401_J05Z support switching applications above 1 MHz?

Yes - the 2N4401_J05Z achieves a current gain-bandwidth product (f_T) of 250 MHz and demonstrates t_f = 30 ns fall time under defined test conditions (V_CC = 30 V, I_C = 150 mA). While usable in switching circuits up to ~5 MHz, practical performance depends on layout parasitics, drive strength, and load capacitance; for >1 MHz operation, minimize trace inductance and use stiff base drive.

What is the guaranteed DC current gain (h_FE) range for the 2N4401_J05Z at 10 mA collector current?

Per the ON Semiconductor datasheet, the 2N4401_J05Z guarantees h_FE ≥ 80 at I_C = 10 mA and V_CE = 1.0 V. The typical value reaches 150 under those conditions, and the full specified range spans 80–300. This makes it suitable for bias-stable amplifier designs where predictable gain is required across production lots.

Can the 2N4401_J05Z replace the 2N2222 in existing designs?

The 2N4401_J05Z can often replace the 2N2222 in common-emitter switching and amplification roles, as both share TO-92 packaging and similar V_CEO/I_C ratings. However, the 2N4401_J05Z offers higher minimum h_FE (40 vs. 35 at 10 mA) and faster switching (t_f = 30 ns vs. ~60 ns), but slightly lower maximum I_C (600 mA vs. 800 mA). Verify base drive and thermal margins before substitution.

What is the emitter-base breakdown voltage (V_EBO) specification for the 2N4401_J05Z?

The 2N4401_J05Z specifies an emitter-base breakdown voltage (V_EBO) of 6.0 V minimum, tested at I_E = 0.1 mA with collector open. This limits reverse-base bias applications - for example, base-emitter reverse voltage must remain below 5.5 V in active-clamp or level-shift configurations to avoid junction degradation over time.