onsemi 2N4402_J14Z

Overview

2N4402_J14Z from Fairchild Semiconductor is a PNP bipolar junction transistor designed for general-purpose amplification and switching in low-to-medium power circuits, with 40 V V_CEO, 600 mA continuous collector current, and TO-92 package. It operates across –55 °C to +150 °C and delivers h_FE ≥ 30 at 1 mA, supporting linear gain stages and saturated-switch applications up to 500 mA in power supplies, relay drivers, and signal inversion circuits.

For engineers reviewing the 2N4402_J14Z datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CEO/V_CBO = 40 V, guaranteed h_FE minimums per test condition, saturation voltage under defined I_C/I_B, thermal resistance (R_θJA = 200 °C/W), and TO-92 mechanical compatibility for through-hole prototyping and production.

Technical Context

The 2N4402_J14Z functions as a medium-current PNP BJT with fixed-emitter bias topology, requiring external base current control for turn-on/turn-off. Its DC current gain varies from h_FE = 30 (I_C = 1 mA) to h_FE = 20 (I_C = 500 mA), and its small-signal h_fe reaches 250 at I_C = 1 mA, f = 100 MHz. Saturation behavior is characterized by V_CE(sat) ≤ 0.40 V at I_C = 150 mA / I_B = 15 mA.

Switching performance is defined by 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 under pulsed conditions (≤300 µs, ≤2% duty cycle). Thermal design must account for R_θJC = 83.3 °C/W and derating of 5.0 mW/°C above 25 °C.

Key Specifications

Pinout & Package

2N4402_J14Z is housed in a standard TO-92 plastic package with 3 leads, intended for through-hole mounting. Lead identification follows JEDEC TO-92 outline: Emitter (E), Base (B), Collector (C), with flat side facing viewer and leads down.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2N4402_J14Z, MPSA92 offers superior voltage headroom but less predictable gain at high current, while BC557 delivers higher h_FE consistency at microampere bias but cannot sustain 500 mA loads-making 2N4402_J14Z the balanced choice for medium-current, cost-sensitive PNP switching.

Availability

2N4402_J14Z is available at Aetrix Electronics and suitable for relay drivers, power supply protection circuits, LED sink interfaces, and digital logic inverters requiring stable component supply and long-lifecycle support.

Supply support for 2N4402_J14Z 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 2N4402_J14Z belongs to Fairchild's legacy general-purpose bipolar transistor family, engineered for cost-effective, robust switching and amplification in industrial controls, power conversion, and interface circuits.

FAQ

What is the maximum continuous collector current rating for 2N4402_J14Z?

The 2N4402_J14Z has an absolute maximum continuous collector current (I_C) rating of 600 mA at T_A = 25 °C. However, operation at 500 mA is validated in the datasheet with specified V_CE(sat) and h_FE values. Derating is required above 25 °C per the 5.0 mW/°C thermal specification, and sustained 600 mA operation demands careful thermal management to avoid exceeding T_J = 150 °C.

Is 2N4402_J14Z pin-compatible with other TO-92 PNP transistors like BC557 or MPSA92?

While 2N4402_J14Z shares the JEDEC TO-92 outline and pinout order (E-B-C, flat side facing viewer), it is not guaranteed pin-compatible with BC557 or MPSA92 due to differences in electrical characteristics and gain profiles. BC557 has higher h_FE but lower I_C rating; MPSA92 has much higher V_CEO but wider h_FE variation. Layout reuse is mechanically possible, but circuit validation is required for each replacement.

What is the typical V_BE(sat) of 2N4402_J14Z under switching conditions?

The 2N4402_J14Z exhibits V_BE(sat) = 0.75 V at I_C = 150 mA and I_B = 15 mA, and 0.95 V at I_C = 500 mA and I_B = 50 mA. These values reflect forward-biased base-emitter junction voltage under forced conduction, directly impacting base drive power and resistor sizing in switching designs.

Does 2N4402_J14Z support high-frequency signal amplification?

No, the 2N4402_J14Z is not characterized for high-frequency amplification. Its small-signal h_fe is specified only at 100 MHz (250 max at I_C = 1 mA), with no f_T or gain-bandwidth product given. The datasheet emphasizes DC switching and low-frequency linear operation; RF or broadband analog use is unsupported and not validated.

How does thermal resistance affect practical usage of 2N4402_J14Z?

With R_θJA = 200 °C/W, the 2N4402_J14Z dissipates 625 mW at 25 °C ambient before reaching T_J = 150 °C. At 500 mA and V_CE(sat) = 0.75 V, power dissipation is ~375 mW-leaving ~62 °C margin. Above 25 °C ambient, derating begins immediately: at 75 °C ambient, max allowable dissipation drops to 500 mW, requiring layout or heatsink adjustments to maintain reliability.