onsemi BC182B_J35Z

Overview

BC182B_J35Z from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for low-to-medium current amplification and switching up to 100 mA. It features V_CEO = 50 V, h_FE = 40–80 at I_C = 100 mA, f_T = 150 MHz, V_CE(sat) = 0.6 V, and TO-92 package - used in audio preamplifiers, signal buffering, and discrete logic interface circuits.

For engineers reviewing the BC182B_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range at 100 mA, saturation voltage under defined drive conditions, thermal resistance (R_θJA = 357 °C/W), noise figure (NF = 10 dB), and TO-92 mechanical compatibility with legacy through-hole layouts.

Technical Context

The BC182B_J35Z operates as a silicon NPN BJT with epitaxial planar construction, optimized for linear amplification and saturated switching. Its h_FE variation (40–80) reflects process binning across collector currents from 10 µA to 100 mA, and its f_T = 150 MHz enables stable small-signal gain up to mid-VHF frequencies under V_CE = 5 V bias.

Thermal design relies on R_θJA = 357 °C/W and P_D = 350 mW at T_A = 25 °C, with linear derating of 2.8 mW/°C above ambient. The device exhibits low leakage: I_CBO ≤ 15 nA at V_CB = 50 V and I_EBO ≤ 15 nA at V_EB = 4 V - supporting stable biasing in high-impedance node applications.

Key Specifications

Pinout & Package

BC182B_J35Z is housed in a standard TO-92 plastic package (3.86 mm height, 4.58 mm length, 1.27 mm lead pitch), with leads arranged in linear configuration: Collector (Lead 1), Base (Lead 2), Emitter (Lead 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC182B_J35Z, BC547B offers higher gain-bandwidth but reduced collector-emitter voltage tolerance, while 2N3904 delivers broader frequency capability at the cost of lower breakdown margin - both require verification of V_CEO compliance in target circuit operating conditions.

Availability

BC182B_J35Z is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic level shifters, and LED current drivers requiring stable component supply, long-term obsolescence resilience, and through-hole manufacturing compatibility.

Supply support for BC182B_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 BC182B_J35Z belongs to Fairchild's legacy general-purpose BJT product line, engineered for cost-sensitive, reliability-critical linear and switching applications in consumer, industrial, and instrumentation equipment.

FAQ

What is the maximum continuous collector current for BC182B_J35Z?

The BC182B_J35Z supports a maximum continuous collector current of 100 mA at T_C = 25 °C. Derating is required above this temperature per the specified thermal resistance. This rating ensures reliable operation in amplifier and switching roles without exceeding junction temperature limits when properly heatsinked or mounted on adequate copper area.

Is BC182B_J35Z suitable for RF amplification applications?

Yes, BC182B_J35Z is suitable for RF amplification up to ~20 MHz due to its f_T = 150 MHz and low Cob = 5 pF. Its noise figure of 10 dB at 1 kHz makes it appropriate for IF and low-VHF stages, though higher-frequency designs may require devices with improved f_T and lower capacitance such as the 2N3904.

What is the pin configuration of BC182B_J35Z in TO-92 package?

The BC182B_J35Z uses standard TO-92 pinout: Lead 1 is Collector, Lead 2 is Base, and Lead 3 is Emitter when viewing the flat side of the package with leads pointing downward and left-to-right orientation. This matches JEDEC TO-92 mechanical specification and ensures compatibility with BC107/BC108/BC109 footprints.

Does BC182B_J35Z have documented thermal derating behavior?

Yes, BC182B_J35Z specifies linear thermal derating: total device dissipation decreases by 2.8 mW per °C above 25 °C ambient, down to zero at T_A ≈ 150 °C. This allows precise power budgeting in enclosed or elevated-temperature environments using R_θJA = 357 °C/W and the published P_D = 350 mW rating.

Can BC182B_J35Z replace BC109 in existing designs?

Yes, BC182B_J35Z can directly replace BC109 in most applications: both are NPN TO-92 transistors with identical pinout, overlapping h_FE ranges (BC109: 110–800; BC182B_J35Z: 40–80), and comparable V_CEO (45 V vs. 50 V). Designers should verify that lower h_FE does not impact bias stability in high-gain amplifier configurations.