onsemi BC182L_J35Z

Overview

BC182L_J35Z from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for low-power amplification and switching at collector currents up to 100 mA. It features V_CEO = 50 V, h_FE = 40–500 (at I_C = 10 µA to 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 BC182L_J35Z datasheet, pinout, applications, or equivalent options, key selection considerations include DC current gain spread across operating current, V_CE(sat) at 100 mA, thermal resistance (R_θJA = 357 °C/W), noise figure (NF = 10 dB @ 0.2 mA), and TO-92 mechanical compatibility with legacy through-hole designs.

Technical Context

The BC182L_J35Z operates as a silicon NPN BJT with epitaxial planar construction, optimized for linear amplification and saturated switching. Its h_FE variation (40–500) reflects process-controlled gain bins, and its f_T = 150 MHz enables stable small-signal gain up to mid-VHF range under V_CE = 5 V bias.

Thermal design relies on R_θJC = 125 °C/W and R_θJA = 357 °C/W, limiting continuous dissipation to 350 mW at T_A = 25 °C with 2.8 mW/°C derating. Cob = 5 pF and NF = 10 dB support low-noise, low-capacitance analog front-end use at I_C = 0.2 mA.

Key Specifications

Pinout & Package

BC182L_J35Z is housed in a standard TO-92 plastic package with 3 leads: Emitter (Pin 1), Collector (Pin 2), Base (Pin 3). Lead spacing is 1.27 mm (0.05"), body height ≤ 3.86 mm, and total length ≤ 4.58 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC182L_J35Z, BC547B offers higher frequency response but reduced collector-emitter breakdown margin, while 2N3904 provides broader industry availability at the expense of voltage and gain headroom - making BC182L_J35Z optimal for legacy 50 V amplifier designs requiring proven thermal behavior and wide h_FE adaptability.

Availability

BC182L_J35Z is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic interfaces, and RF detector buffers requiring stable component supply, long-lifecycle support, and consistent TO-92 mechanical fit.

Supply support for BC182L_J35Z 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 BC182L_J35Z belongs to Fairchild's legacy general-purpose BJT family, engineered for reliability in linear amplification and switching across consumer, industrial, and communications equipment.

FAQ

What is the maximum collector current rating for BC182L_J35Z?

The BC182L_J35Z has a continuous collector current rating of 100 mA at T_A = 25 °C. Derating applies above ambient temperature per its 2.8 mW/°C thermal coefficient. This rating supports use in low-power amplifiers and switches, but sustained operation near 100 mA requires attention to PCB copper area and ambient airflow to maintain junction temperature below 150 °C. The BC182L_J35Z must not exceed this limit without thermal mitigation.

Does BC182L_J35Z have a specified noise figure, and under what conditions?

Yes, BC182L_J35Z specifies a noise figure of 10 dB measured at V_CE = 5 V, I_C = 0.2 mA, R_S = 2 kΩ, f = 1 kHz, and bandwidth = 200 Hz. This value is validated in the original Fairchild datasheet and confirms suitability for low-noise preamplifier roles where signal levels are sub-millivolt. The BC182L_J35Z achieves this performance without external bypassing, leveraging its intrinsic low-noise epitaxial structure.

What is the pin configuration of BC182L_J35Z in the TO-92 package?

The BC182L_J35Z uses standard TO-92 pinout: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - with flat side facing viewer and leads downward. This matches JEDEC TO-92 outline and is identical to BC107, BC108, and BC547 series. The BC182L_J35Z pinout enables direct substitution in legacy designs without PCB modification, provided thermal and electrical margins remain within spec.

Is BC182L_J35Z suitable for switching applications, and what is its V_CE(sat)?

Yes, BC182L_J35Z is qualified for switching use with V_CE(sat) = 0.25 V (typ.) at I_C = 10 mA and I_B = 0.5 mA, and 0.6 V (max) at I_C = 100 mA and I_B = 5 mA. These values confirm low conduction loss in saturated mode. When used as a switch, the BC182L_J35Z requires adequate base drive to ensure full saturation and avoid secondary breakdown - especially near its 100 mA limit.

What is the thermal resistance specification for BC182L_J35Z, and how does it affect layout?

BC182L_J35Z has R_θJA = 357 °C/W (junction-to-ambient) and R_θJC = 125 °C/W (junction-to-case). These values indicate significant self-heating even at moderate power: dissipating 100 mW raises junction temperature ~36 °C above ambient. To sustain reliability, PCB layout must include ≥1 cm² of 1-oz copper connected to the collector lead (Pin 2), and avoid enclosing the TO-92 body in tight enclosures. The BC182L_J35Z thermal behavior is well-documented in Fairchild's Rev. A datasheet.