onsemi 2N4403_D11Z

Overview

2N4403_D11Z from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor used for amplification and switching in low-to-medium power circuits, with V_CEO = 40 V, I_C = 600 mA, h_FE = 30–300 (at I_C = 0.1–500 mA), f_T = 200 MHz, and TO-92 package. It operates across –55°C to +150°C and supports fast switching with t_d = 15 ns, t_r = 20 ns.

For engineers reviewing the 2N4403_D11Z datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, TO-92 mechanical compatibility, saturation voltage performance at 150 mA/15 mA drive, thermal resistance (R_θJA = 200°C/W), and suitability for discrete logic-level switching and analog gain stages.

Technical Context

The 2N4403_D11Z is a silicon PNP BJT optimized for linear amplification and saturated switching. Its DC current gain (h_FE) varies from 30 at 500 mA to 300 at 1 mA, enabling flexible biasing across load conditions. The device exhibits low V_CE(sat) (0.4 V @ I_C = 150 mA, I_B = 15 mA) and moderate small-signal bandwidth (f_T = 200 MHz), supporting audio-frequency amplification and digital signal routing.

Thermal design relies on its R_θJA = 200°C/W (TO-92, free-air) and maximum junction temperature of +150°C. Switching behavior is characterized by storage time (t_s = 225 ns) dominating turn-off delay, requiring base-drive optimization for high-speed operation in pulse applications.

Key Specifications

Pinout & Package

2N4403_D11Z is housed in a through-hole TO-92 package with standard lead configuration: Emitter (E), Base (B), Collector (C) arranged left-to-right when viewing the flat side with leads downward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT4403 and 2N3906, the 2N4403_D11Z delivers superior continuous current handling (600 mA vs. 350 mA/200 mA) and higher power dissipation (625 mW), making it the preferred choice for robust through-hole switching where thermal mass and manual assembly are acceptable.

Availability

2N4403_D11Z is available at Aetrix Electronics and suitable for automotive lighting control, industrial relay drivers, audio signal amplifiers, and discrete logic-level translators requiring stable component supply and long-term obsolescence management.

Supply support for 2N4403_D11Z 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 components before its acquisition by ON Semiconductor in 2016.

The 2N4403_D11Z belongs to Fairchild's legacy general-purpose bipolar transistor family, designed for cost-sensitive, high-reliability discrete amplification and switching in industrial, automotive, and consumer electronics.

FAQ

What is the maximum continuous collector current rating for the 2N4403_D11Z?

The 2N4403_D11Z has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This rating assumes proper thermal management; derating is required above 25°C per the 5.0 mW/°C specification. At 150°C ambient, usable I_C drops to approximately 310 mA to maintain junction temperature ≤150°C. The 2N4403_D11Z must not be operated beyond this limit in sustained DC or high-duty-cycle pulsed applications.

Is the 2N4403_D11Z pin-compatible with the 2N3906?

No, the 2N4403_D11Z is not pin-compatible with the 2N3906. Both use TO-92 packages but differ in lead assignment: 2N4403_D11Z has E-B-C (left-to-right, flat side facing), while 2N3906 uses E-C-B. Swapping them without PCB modification will result in incorrect biasing and potential device failure. Always verify pinout using the official Fairchild 2N4403_D11Z datasheet before substitution.

What is the typical storage time (t_s) of the 2N4403_D11Z and how does it affect switching performance?

The 2N4403_D11Z has a typical storage time (t_s) of 225 ns under V_CC = 30 V, I_C = 150 mA conditions. This parameter dominates total turn-off delay and limits maximum usable switching frequency in saturated-mode applications. For PWM operation above 1 MHz, active base pull-down or Baker clamp techniques are recommended to reduce t_s. The 2N4403_D11Z is best suited for switching frequencies ≤500 kHz in standard resistor-biased configurations.

Does the 2N4403_D11Z support operation at elevated ambient temperatures?

Yes, the 2N4403_D11Z is rated for operation from –55°C to +150°C junction temperature, with corresponding ambient capability depending on thermal design. At 100°C ambient and free-air convection, its 625 mW power dissipation must be reduced to ~250 mW (per R_θJA = 200°C/W). Derating curves confirm functional operation up to 125°C ambient with appropriate PCB copper area or airflow-making the 2N4403_D11Z suitable for under-hood automotive and industrial control environments.

Can the 2N4403_D11Z be used in linear amplifier configurations?

Yes, the 2N4403_D11Z is explicitly characterized for linear amplification, with published h_fe, h_ie, h_re, and h_oe parameters at 1 kHz and multiple bias points. Its f_T = 200 MHz and low output capacitance (C_cb = 8.5 pF) support stable gain up to 100 kHz in common-emitter configurations. However, thermal stability must be ensured-linear operation at high V_CE × I_C products requires heatsinking to prevent thermal runaway, as the 2N4403_D11Z lacks built-in thermal protection.