onsemi BC847CLT1

Overview

BC847CLT1 from onsemi is an NPN silicon general-purpose transistor in SOT-23 package, rated for V_CEO = 45 V, I_C = 100 mA, and h_FE = 420–800 (at I_C = 2.0 mA, V_CE = 5.0 V), used in low-voltage signal amplification and switching circuits in consumer and industrial electronics.

For engineers reviewing the BC847CLT1 datasheet, pinout, applications, or equivalent options, key selection factors include its guaranteed DC current gain range, SOT-23 thermal performance (P_D = 225 mW on FR-5 board), ESD robustness (>4000 V HBM), and Pb-free compliance per JESD22-A114.

Technical Context

The BC847CLT1 operates as a discrete bipolar junction transistor with fixed NPN polarity, optimized for linear amplification and saturated switching in low-power analog and digital interface stages. Its f_T = 100 MHz supports audio-frequency and low-speed digital signal handling, while C_obo = 4.5 pF limits high-frequency parasitic coupling.

It features a base-emitter turn-on voltage of 580–770 mV (I_C = 2.0–10 mA, V_CE = 5.0 V) and saturation voltages of V_CE(sat) ≤ 0.6 V (I_C = 100 mA, I_B = 5.0 mA), enabling efficient operation in 3.3 V and 5 V logic-level drive applications.

Key Specifications

Pinout & Package

SOT-23 (Case 318, Style 6) surface-mount package with 3-pin configuration, 1.3 mm × 2.9 mm footprint, 0.95 mm height, and moisture sensitivity level (MSL) 1 - unscreened reflow compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC847BLT1 and MMBT3904LT1G, the BC847CLT1 delivers higher and tighter h_FE tolerance (420–800), enabling simpler bias networks and improved temperature stability in gain-critical analog stages without recalculating resistor values.

Availability

BC847CLT1 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface stages, relay coil drivers, and audio pre-amplifier applications requiring stable component supply and RoHS-compliant sourcing.

Supply support for BC847CLT1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The BC847CLT1 belongs to the BC846/847/848 family of preferred general-purpose transistors, designed for high-reliability, low-cost signal switching and amplification in space-constrained consumer and industrial PCBs.

FAQ

What is the maximum collector-emitter voltage rating for BC847CLT1?

The BC847CLT1 has a maximum collector-emitter voltage (V_CEO) rating of 45 Vdc. This value is specified under test conditions of I_C = 10 mA and represents the absolute maximum voltage the device can withstand before breakdown. It is critical for ensuring safe operation in 24 V systems and provides margin against transient spikes in relay or solenoid drive applications. Exceeding this rating risks permanent device failure.

Does BC847CLT1 support Pb-free soldering processes?

Yes, BC847CLT1 is Pb-free and complies with JESD22-A114 (HBM ESD) and RoHS Directive 2011/65/EU. Its marking "1G" and packaging designation confirm lead-free terminations, and it is qualified for standard reflow profiles including JEDEC J-STD-020. The device has moisture sensitivity level (MSL) 1, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly.

What is the guaranteed DC current gain (h_FE) range for BC847CLT1?

The BC847CLT1 guarantees h_FE = 420–800 when tested at I_C = 2.0 mA and V_CE = 5.0 V. This "C" grade binning ensures consistent gain across production lots, reducing need for manual calibration or resistor trimming in amplifier bias networks. The upper limit of 800 reflects typical performance at room temperature; actual gain decreases with rising junction temperature and higher collector currents.

Can BC847CLT1 be used in switching applications with 100 mA load current?

Yes, BC847CLT1 supports continuous collector current (I_C) up to 100 mA, making it suitable for switching loads such as LEDs, small relays, or logic buffers. At I_C = 100 mA and I_B = 5.0 mA, V_CE(sat) ≤ 0.6 V ensures low conduction loss (<60 mW). Thermal design must account for P_D = 225 mW max on FR-5 board, requiring adequate copper pour or derating above 25°C ambient.

What is the base-emitter saturation voltage (V_BE(sat)) for BC847CLT1?

The BC847CLT1 exhibits V_BE(sat) = 0.7–0.9 V when operating at I_C = 10–100 mA and corresponding base drive (I_B = 0.5–5.0 mA). This range ensures reliable turn-on from standard 3.3 V and 5 V logic outputs without external level-shifting. At lower currents (e.g., I_C = 10 mA), V_BE(sat) is typically ~0.7 V, supporting efficient biasing in low-power sensor interface circuits.