onsemi 2N4402TFR

Overview

2N4402TFR from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for amplification and switching applications with continuous collector current up to 600 mA, V_CEO = 40 V, and V_EBO = 5.0 V. It operates across –55°C to +150°C and delivers h_FE ≥ 30 at I_C = 1.0 mA, supporting low-voltage logic-level switching in power management and signal conditioning circuits.

For engineers reviewing the 2N4402TFR datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TO-92 package thermal resistance (R_θJA = 200 °C/W), saturation voltage (V_CE(sat) = 0.40 V @ I_C = 150 mA), switching speed (t_s = 225 ns), and junction temperature rating (T_J = 150 °C).

Technical Context

The 2N4402TFR functions as a medium-current PNP BJT with fixed gain structure optimized for linear amplification and saturated switching. Its DC current gain (h_FE) varies from 30 to 150 depending on operating point, and small-signal h_fe reaches 250 at I_C = 1.0 mA, f = 100 MHz.

Thermal design relies on its TO-92 package's R_θJC = 83.3 °C/W and R_θJA = 200 °C/W, while switching performance is characterized by t_d = 15 ns, t_r = 20 ns, t_s = 225 ns, and t_f = 30 ns under pulsed conditions (≤300 µs, ≤2% duty cycle).

Key Specifications

Pinout & Package

2N4402TFR is housed in a TO-92 plastic package with standard three-terminal configuration: Emitter (E), Base (B), Collector (C). Pin identification follows JEDEC TO-92 outline with flat side facing viewer and leads downward; left-to-right pin order is E-B-C when viewed from bottom (lead side).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA92 and BC557, the 2N4402TFR offers balanced trade-offs: sufficient 40 V/600 mA capability for industrial switching, predictable h_FE behavior across mid-range currents, and proven thermal performance in TO-92 without requiring derating below 625 mW at 25°C.

Availability

2N4402TFR is available at Aetrix Electronics and suitable for relay driver circuits, DC motor direction control, linear voltage regulator pass elements, and LED current sink drivers requiring stable component supply and long-term industrial availability.

Supply support for 2N4402TFR 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.

The 2N4402TFR belongs to Fairchild's legacy general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability industrial and consumer switching and amplification applications.

FAQ

What is the maximum continuous collector current rating for the 2N4402TFR?

The 2N4402TFR has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This value decreases linearly above 25°C at 5.0 mW/°C derating rate, consistent with its 625 mW total power dissipation limit. Engineers must verify thermal margin using R_θJA = 200 °C/W when designing PCB layouts for sustained load conditions.

Does the 2N4402TFR support switching applications, and what are its key timing parameters?

Yes, the 2N4402TFR is qualified for switching use with documented pulse test parameters: delay time (t_d) = 15 ns, rise time (t_r) = 20 ns, storage time (t_s) = 225 ns, and fall time (t_f) = 30 ns at V_CC = 30 V and I_C = 150 mA. These values confirm suitability for <100 kHz PWM and digital logic interfacing when operated within absolute maximum ratings.

What is the package type and pin configuration of the 2N4402TFR?

The 2N4402TFR uses a TO-92 plastic package with standardized pinout: when viewing the flat side with leads pointing downward, the left-to-right pin order is Emitter (E), Base (B), Collector (C). This configuration matches JEDEC TO-92 mechanical outline and is compatible with automated through-hole assembly processes.

How does the 2N4402TFR's DC current gain (h_FE) vary with operating conditions?

The 2N4402TFR exhibits h_FE = 30 minimum at I_C = 1.0 mA, rising to 50 at I_C = 10 mA and peaking near 150 at I_C = 150 mA (V_CE = 2.0 V). Gain declines to 20 at I_C = 500 mA due to high-current effects. Designers should reference the "Typical Pulsed Current Gain vs Collector Current" curve in the 2N4402TFR datasheet for precise biasing.

Is the 2N4402TFR suitable for automotive applications?

The 2N4402TFR supports an operating junction temperature range of –55°C to +150°C and meets industrial reliability standards, but it is not AEC-Q101 qualified. For non-safety-critical automotive subsystems (e.g., cabin lighting control or HVAC fan drivers), the 2N4402TFR may be used with appropriate derating and validation; however, AEC-Q101-compliant alternatives are recommended for safety-related functions.