onsemi BC182B_D26Z

Overview

BC182B_D26Z from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for low-power amplification and switching up to 100 mA collector current. It features V_CEO = 50 V, h_FE = 40–80 at I_C = 100 mA, f_T = 150 MHz, and TO-92 package - used in audio preamplifiers, signal buffering, and discrete logic interface circuits.

For engineers reviewing the BC182B_D26Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, saturation voltage at 100 mA, thermal resistance (R_θJA = 357 °C/W), breakdown voltage margins, and TO-92 mechanical compatibility with legacy through-hole layouts.

Technical Context

The BC182B_D26Z operates as a silicon NPN BJT with epitaxial planar construction, optimized for linear amplification and saturated switching. Its h_FE variation across I_C (40 min at 100 mA, 80 max at 10 µA) supports both high-gain small-signal stages and robust current-driven switching.

Thermal design is constrained by P_D = 350 mW at T_A = 25°C and R_θJA = 357 °C/W, requiring minimal copper area or airflow for continuous 100 mA operation. Cob = 5 pF and f_T = 150 MHz indicate suitability for audio and low-MHz RF coupling, not broadband RF power.

Key Specifications

Pinout & Package

BC182B_D26Z is housed in a standard TO-92 plastic package (3-lead, vertical mounting, lead pitch 1.27 mm). Dimensions conform to JEDEC TO-92 outline: body height 4.58 mm max, lead length 3.60 mm ±0.20 mm, flange width 1.02 mm ±0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC182B_D26Z, BC547B offers higher small-signal h_FE but reduced V_CEO margin, while 2N3904 extends current capability at the cost of lower breakdown rating - both require revalidation of saturation behavior and thermal margin in 100 mA continuous designs.

Availability

BC182B_D26Z is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic level shifters, and low-power relay drivers requiring stable component supply and legacy TO-92 footprint compatibility.

Supply support for BC182B_D26Z 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 BC182B_D26Z belongs to Fairchild's legacy general-purpose BJT family, engineered for cost-sensitive, through-hole analog and switching applications where reliability, thermal predictability, and standardized TO-92 fit are essential.

FAQ

What is the maximum continuous collector current for BC182B_D26Z?

The BC182B_D26Z has a maximum continuous collector current (I_C) of 100 mA at T_A = 25°C. Derating applies above 25°C at 2.8 mW/°C. This rating is validated under specified test conditions in the Fairchild datasheet Rev. A (August 2003), and BC182B_D26Z must be operated within this limit to ensure reliability and avoid thermal runaway.

Is BC182B_D26Z pin-compatible with other TO-92 NPN transistors like BC547 or 2N3904?

BC182B_D26Z uses the standard TO-92 pinout (1 = Collector, 2 = Base, 3 = Emitter), matching BC547 and 2N3904. However, pin compatibility does not guarantee functional equivalence - BC182B_D26Z has distinct h_FE, V_CEO, and V_CE(sat) values. Circuit validation is required before substitution, especially in saturation-critical or high-voltage applications involving BC182B_D26Z.

What is the typical noise figure of BC182B_D26Z and where is it specified?

The BC182B_D26Z has a noise figure (NF) of 10 dB, measured at V_CE = 5 V, I_C = 0.2 mA, R_S = 2 kΩ, f = 1 kHz, and BW = 200 Hz. This value is explicitly listed in the "Dynamic Characteristics" section of the official Fairchild datasheet (Rev. A, August 2003) and applies to low-noise small-signal amplification - not switching or high-current operation of BC182B_D26Z.

Does BC182B_D26Z support operation at elevated ambient temperatures?

Yes, BC182B_D26Z is rated for junction temperature (T_J) up to 150°C and storage temperature (T_STG) from –55°C to +150°C. At T_A > 25°C, power dissipation must be derated linearly at 2.8 mW/°C. For reliable BC182B_D26Z operation at 70°C ambient, maximum allowable P_D drops to ~224 mW - requiring careful thermal layout verification.

What is the output capacitance (C_ob) of BC182B_D26Z and how does it affect circuit performance?

The BC182B_D26Z has an output capacitance (C_ob) of 5 pF, measured at V_CE = 10 V, I_C = 0, and f = 1 MHz. This low capacitance minimizes high-frequency roll-off and phase shift in amplifier feedback networks, making BC182B_D26Z suitable for audio and low-MHz signal paths where capacitive loading could degrade stability or bandwidth.