onsemi BC847BMTF

Overview

BC847BMTF from onsemi is an NPN epitaxial silicon transistor in SOT-23 package, rated for 45 V V_CEO, 100 mA I_C, and 310 mW power dissipation, with h_FE range 200–450 at I_C = 2 mA, V_CE = 5 V. It serves as a general-purpose switching and amplification device in low-voltage signal conditioning and load control circuits.

For engineers reviewing the BC847BMTF datasheet, pinout, applications, or equivalent options, key selection criteria include its V_CEO = 45 V rating, h_FE classification B (200–450), SOT-23 footprint compatibility, and verified performance in 200 μA–100 mA operating range with f_T = 300 MHz.

Technical Context

This discrete NPN transistor operates in active, saturation, and cutoff regions with defined V_BE(on) = 580–700 mV at I_C = 2 mA and V_CE = 5 V, and exhibits V_CE(sat) ≤ 250 mV at I_C = 10 mA / I_B = 0.5 mA. Its Cob = 3.5–6.0 pF and f_T = 300 MHz support high-frequency small-signal amplification up to ~100 MHz.

Thermal resistance R_θJA = 403 °C/W and junction temperature limit T_J = 150 °C define its safe operating area under PCB-mounted conditions per FR-4 76 mm × 114 mm layout. The device is not optimized for ultra-low-noise applications-BC850 variants are specified for NF = 1.2–3.0 dB, while BC847BMTF has NF = 2.0–10.0 dB.

Key Specifications

Pinout & Package

SOT-23 3-lead plastic surface-mount package with standard pin assignment: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. Compact 2.9 mm × 1.3 mm footprint supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC847BW and MMBT3904LT1G, BC847BMTF provides guaranteed tape-and-reel delivery, higher V_CEO (45 V), and broader h_FE range (200–450), making it preferred for production-grade 24 V embedded control and automated assembly environments.

Availability

BC847BMTF is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfaces, low-voltage sensor amplifiers, and relay driver stages requiring stable component supply and consistent SOT-23 packaging.

Supply support for BC847BMTF 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 delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The BC846/BC847/BC848/BC850 family was designed for cost-sensitive, high-volume general-purpose switching and amplification in consumer, computing, and industrial electronics with standardized SOT-23 packaging.

FAQ

What is the maximum collector-emitter voltage rating for BC847BMTF?

The BC847BMTF has a maximum collector-emitter voltage (V_CEO) rating of 45 V at T_A = 25 °C. This rating applies under DC conditions and defines the upper limit for safe operation in common-emitter configurations. Exceeding this voltage risks avalanche breakdown and permanent device damage. Derating is required at elevated ambient temperatures per the datasheet thermal curves.

What does the "B" in BC847BMTF indicate?

Within the BC847 series, the "B" suffix denotes the h_FE (DC current gain) classification band: 200–450 at I_C = 2 mA and V_CE = 5 V. This distinguishes BC847BMTF from BC847AMTF (110–220) and BC847CMTF (420–800). The "MTF" suffix confirms SOT-23 package and tape-and-reel packing per EIA-481 standards.

Is BC847BMTF pin-compatible with BC847BW?

Yes, BC847BMTF and BC847BW share identical SOT-23 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector) and electrical specifications. The sole difference is packaging: BC847BMTF is supplied in tape-and-reel format for automated placement, while BC847BW is offered in cut-tape. No PCB layout change is needed when substituting between them.

What is the typical noise figure of BC847BMTF at 1 kHz?

The BC847BMTF has a noise figure (NF) of 2.0–10.0 dB at V_CE = 5 V, I_C = 200 μA, R_G = 2 kΩ, and f = 1 kHz. This range reflects unit-to-unit variation within the B-class h_FE bin. For ultra-low-noise designs, BC850 variants (NF = 1.2–3.0 dB) are specified, but BC847BMTF remains suitable for non-critical analog front-ends.

Can BC847BMTF be used in RF amplifier stages?

Yes, BC847BMTF supports RF amplification up to ~100 MHz due to its f_T = 300 MHz and Cob = 3.5–6.0 pF. It is commonly used in low-gain, broadband preamplifier stages and oscillator buffer circuits. However, it lacks optimized RF-specific parameters (e.g., S-parameters, gain flatness), so for >100 MHz or high-efficiency RF, dedicated RF transistors like MMBTH10 are recommended over BC847BMTF.