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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated BC847BT-7-F

Name: BC847BT-7-F
Brand: Diodes Incorporated
SKU: BC847BT-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC847BT-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: SOT-523

Datasheet:: BC847BT-7-F.pdf

Description:: TRANS NPN 45V 0.1A SOT-523

Quantity:: RFQ Add To RFQ list

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Inventory:349,406

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Product details

Overview

BC847BT-7-F from Diodes Incorporated is a 45V NPN small-signal transistor in SOT523 package, rated for 100mA collector current, with minimum DC current gain (h_FE) of 220 at I_C = 2mA and V_CE = 5V, and V_CE(sat) ≤ 600mV at I_C = 100mA/I_B = 5mA. It serves as a general-purpose switching and amplification device in space-constrained consumer and industrial control circuits.

For engineers reviewing the BC847BT-7-F datasheet, BC847BT-7-F pinout, BC847BT-7-F application, or BC847BT-7-F equivalent, key selection criteria include its 45V V_CEO, 150mW power dissipation, 100MHz f_T, ESD robustness (4kV HBM), and SOT523 footprint compatibility with high-density PCB layouts.

Technical Context

This NPN bipolar junction transistor uses epitaxial planar die construction for stable gain and low leakage. Its 45V V_CEO and 6V V_EBO support operation in low-to-mid voltage bias networks, while the 100MHz f_T enables audio-frequency amplification and digital switching up to ~10MHz.

Thermal resistance of 833°C/W (R_θJA) reflects its ultra-small SOT523 package limitations; derating is required above +25°C ambient. The device exhibits h_FE grouping (B-grade: 220–450) and guaranteed V_CE(sat) performance under defined overdrive conditions (I_B/I_C = 1/20).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating range in switch-mode or linear amplifier configurations.
I_C	100 mA - Continuous collector current rating; sets upper limit for load-driving capability in discrete logic interfaces or sensor buffers.
h_FE (Min)	220 - Minimum DC current gain at I_C = 2mA, V_CE = 5V; ensures predictable base drive requirements for saturation in switching applications.
f_T	100 MHz - Current gain-bandwidth product; supports stable small-signal amplification up to audio frequencies and fast digital edge handling.
P_D	150 mW - Maximum power dissipation at +25°C ambient; constrains usable I_C×V_CE product in thermally unmanaged layouts.
ESD HBM	4,000 V - Human Body Model rating; provides baseline electrostatic immunity during board assembly and handling without external protection.

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.55 mm), lead-free, halogen-free, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side reference; determines polarity and current direction in common-emitter configurations.
2 (Base)	Control input	Receives forward-biased current to enable conduction; requires precise I_B calculation based on h_FE and target I_C.
3 (Collector)	Current source terminal	Connected to load and supply rail; carries switched or amplified output current; must remain within V_CEO and P_D limits.

Key Features

Feature	Design Value
Ultra-compact SOT523 footprint	Enables placement in <1.0 mm² board area-critical for wearables, hearing aids, and miniaturized IoT sensors.
Guaranteed h_FE range (220–450)	Reduces base resistor tolerance sensitivity and simplifies bias network design across production lots.
100MHz f_T with low C_obo (4.5pF)	Supports clean signal integrity in 1–10MHz clock buffering and analog front-end preamplifier stages.
4kV HBM ESD rating	Eliminates need for external ESD protection diodes in handheld or field-deployable equipment interfaces.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20mA indicator LEDs from 3.3V/5V MCU outputs with current limiting.

IC Role / Device Role / Timing Role: NPN switch controlling LED anode-to-rail path; operates in saturation with <600mV V_CE(sat).

Use Value: Enables direct GPIO drive without level-shifting; low V_CE(sat) minimizes power loss and thermal rise in compact enclosures.

Use Scenario: Amplifying weak analog sensor signals (e.g., thermistor, photodiode) before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed-gain biasing; leverages 220+ h_FE and 100MHz f_T.

Use Value: Provides stable 10–50× voltage gain with minimal component count; low noise figure (<4dB) preserves SNR in battery-powered sensing nodes.

Power Sequencing Control

RS-232 Level Translation

Use Scenario: Enabling/disabling auxiliary rails (e.g., 3.3V, 1.8V) in multi-voltage systems using enable signals.

IC Role / Device Role / Timing Role: Low-side switch controlling PMOS gate pull-down; handles 100mA inrush and steady-state loads.

Use Value: Ensures controlled ramp-up via predictable turn-on delay and minimal V_CE(sat)-induced droop during sequencing transitions.

Use Scenario: Converting TTL-level UART signals (0/3.3V) to RS-232-compatible ±3V to ±15V levels using discrete charge-pump assist.

IC Role / Device Role / Timing Role: Inverter stage in open-collector level translator; switches rapidly with <100ns t_on/t_off (derived from f_T and C_obo).

Use Value: Delivers reliable 115.2kbps data integrity without timing skew; SOT523 size allows integration near connector footprints.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904-7-F	Same SOT523 package; h_FE min = 100 (lower gain consistency); V_CEO = 40V (5V lower headroom)	Suitable for lower-voltage logic interfacing but less margin in 3.3V/5V mixed-rail systems	Select when cost sensitivity outweighs gain stability and voltage margin requirements
BC847BW-7-F	SOT323 package (larger footprint); identical electrical specs; higher R_θJA (625°C/W vs 833°C/W)	Better thermal performance in moderate-power switching; incompatible with ultra-dense SOT523 layouts	Choose when board space permits larger package and thermal management is prioritized over miniaturization

Compared with MMBT3904-7-F, BC847BT-7-F offers higher V_CEO and tighter h_FE binning for predictable switching; versus BC847BW-7-F, it trades thermal margin for 40% smaller PCB area-critical in wearables and medical patches.

Availability

BC847BT-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, power sequencing control, and RS-232 level translation requiring stable component supply and consistent parametric performance across production batches.

Supply support for BC847BT-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The BC847 series belongs to Diodes' small-signal transistor product line, engineered for high-volume, space-constrained applications demanding reliability, RoHS compliance, and tight parametric consistency in consumer, industrial, and automotive-qualified variants.

FAQ

What is the maximum continuous collector current for BC847BT-7-F?

The absolute maximum continuous collector current (I_C) is 100mA at T_A = +25°C. Derating is required above ambient temperature per the R_θJA = 833°C/W specification; at +85°C ambient, max I_C drops to approximately 65mA assuming V_CE ≤ 5V and no heatsinking.

Is BC847BT-7-F suitable for automotive applications?

No-BC847BT-7-F is not qualified to AEC-Q101. For automotive use, Diodes offers the pin- and spec-compatible BC847BTQ variant, which undergoes additional stress testing and lot traceability per automotive quality standards.

How does the SOT523 package affect thermal performance?

The SOT523's 833°C/W R_θJA reflects its minimal copper exposure and thin mold compound. Effective thermal management requires optimized PCB pad layout (minimum 1oz copper, ≥2mm² exposed collector pad) and avoidance of adjacent heat sources to prevent junction temperatures exceeding +150°C.

What is the typical noise figure for BC847BT-7-F in amplifier configurations?

The noise figure is 4dB at V_CE = 5V, R_S = 2kΩ, f = 1MHz, and BW = 200Hz. This value is measured under standardized conditions and remains stable across the B-grade h_FE bin; it supports low-noise preamplification in battery-powered sensor signal chains.

BC847BT-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-523

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 2mA, 5V

Power - Max:: 150 mW

Frequency - Transition:: 100MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-523

BC847BT-7-F FAQ

1.How can I place an order for BC847BT-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC847BT-7-F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BC847BT-7-F reliable?

The price and inventory of BC847BT-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847BT-7-F is usually 5 days.

3.What payment methods are accepted for BC847BT-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847BT-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847BT-7-F?

BC847BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC847BT-7-F order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BC847BT-7-F?

For technical support, including BC847BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847BT-7-F requirements.

6.How does Aetrix verify that BC847BT-7-F is sourced from the original manufacturer or authorized distributors?

All BC847BT-7-F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC847BT-7-F meets industry standards.

7.What is the process for return or replacement of BC847BT-7-F?

All BC847BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC847BT-7-F, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BC847BT-7-F part is unused and in its original packaging.

Return procedure for BC847BT-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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