onsemi BC183C

Overview

BC183C from Fairchild Semiconductor is an NPN general-purpose amplifier transistor in TO-92 package, rated for 30 V V_CEO, 100 mA I_C, 350 mW P_C, with h_FE range of 40–800 at I_C = 10 μA to 100 mA, and f_T = 150 MHz - used in low-power signal amplification and switching circuits in consumer audio and sensor interface stages.

For engineers reviewing the BC183C datasheet, pinout, applications, or equivalent options, key selection considerations include its DC current gain variability across operating current, saturation voltage behavior at 10 mA/100 mA drive levels, thermal limits in ambient-constrained PCB layouts, and compatibility with legacy through-hole amplifier designs requiring TO-92 footprint and NPN polarity.

Technical Context

The BC183C operates as a silicon NPN bipolar junction transistor optimized for linear amplification and moderate-speed switching. Its h_FE spans 40–800 depending on collector current (10 μA to 100 mA), and it delivers V_CE(sat) ≤ 0.6 V at I_C = 100 mA / I_B = 5 mA, supporting reliable turn-on in driver stages.

With f_T = 150 MHz and C_OB = 5 pF at V_CE = 10 V, the device supports RF-coupled audio preamplifier and IF amplifier applications up to ~50 MHz small-signal bandwidth; noise figure is specified at 10 dB under V_CE = 5 V, I_C = 200 mA, R_G = 2 kΩ, 1 kHz.

Key Specifications

Pinout & Package

BC183C is housed in a standard TO-92 plastic package with 3 leads: Collector (Lead 1), Base (Lead 2), Emitter (Lead 3). The package supports through-hole mounting and provides adequate thermal dissipation for low-power analog and switching use cases.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC183C, BC547B offers higher minimum h_FE and bandwidth but narrower gain spread, while 2N3904 provides superior switching consistency and thermal margin at the expense of analog gain flexibility - all three share TO-92 footprint and NPN polarity, enabling direct substitution only after verifying bias network adjustments.

Availability

BC183C is available at Aetrix Electronics and suitable for audio preamplifiers, sensor interface circuits, and LED driver switches requiring stable component supply and legacy through-hole compatibility.

Supply support for BC183C 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 BC183C belongs to Fairchild's legacy general-purpose transistor family, designed for cost-sensitive, low-power linear amplification and switching in consumer, industrial, and educational electronics.

FAQ

What is the maximum collector-emitter voltage rating for BC183C?

The BC183C has a maximum collector-emitter voltage (V_CEO) rating of 30 V at T_C = 25°C. This rating decreases with increasing junction temperature and must be derated per the datasheet's thermal curves. Exceeding 30 V risks avalanche breakdown and permanent device failure. Always maintain at least 20% voltage margin in BC183C designs operating near this limit.

Does BC183C support high-frequency amplification?

Yes, the BC183C has a current-gain bandwidth product (f_T) of 150 MHz, enabling effective small-signal amplification up to approximately 50 MHz with usable gain. Its 5 pF output capacitance and noise figure of 10 dB at 1 kHz make it suitable for IF amplifiers and audio preamps, but not for GHz-range RF front-ends. For BC183C, optimal high-frequency performance requires controlled impedance layout and minimal parasitic inductance.

What is the pin configuration of BC183C in TO-92 package?

The BC183C uses standard TO-92 pinout: Lead 1 is Collector, Lead 2 is Base, and Lead 3 is Emitter - verified from Fairchild's BC183C Rev. A datasheet diagram and footprint documentation. This matches industry-standard NPN TO-92 orientation when viewing the flat side with leads downward. Incorrect orientation during PCB assembly may cause circuit malfunction or device damage in BC183C implementations.

How does hFE variation affect BC183C circuit design?

The BC183C exhibits wide h_FE variation (40–800) across operating conditions, making open-loop DC bias highly sensitive to unit-to-unit spread. Successful BC183C designs require emitter degeneration resistors, collector feedback, or dual-supply stabilization to maintain quiescent point stability. Without such measures, BC183C amplifier stages may saturate or cut off unpredictably across production lots.

Is BC183C suitable for switching applications?

Yes, BC183C is routinely used in low-speed switching applications such as LED drivers and relay controls. Its V_CE(sat) is 0.25 V at I_C = 10 mA / I_B = 0.5 mA and 0.6 V at I_C = 100 mA / I_B = 5 mA, confirming reliable saturation. However, switching speed is limited by minority-carrier storage time; BC183C is not recommended for >100 kHz PWM without Baker clamp or base drive optimization.