Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Infineon Technologies BC818-40WE6327

Name: BC818-40WE6327
Brand: Infineon Technologies
SKU: BC818-40WE6327
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC818-40WE6327

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC818-40WE6327.pdf

Description:: TRANS 25V 0.5A PG-SOT323-3-1

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:24,000

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BC818-40WE6327 from Infineon Technologies is an NPN bipolar junction transistor (BJT) optimized for general-purpose amplification and switching in low-voltage, medium-current applications. It features a DC current gain (h_FE) of 250–630 at I_C = 10 mA, V_CE = 1 V; V_CEO = 30 V; I_C = 100 mA continuous collector current; and a maximum power dissipation of 330 mW in SOT-23 package.

For engineers reviewing the BC818-40WE6327 datasheet, BC818-40WE6327 pinout, BC818-40WE6327 application, or BC818-40WE6327 equivalent, key selection criteria include h_FE range consistency, SOT-23 thermal performance under pulsed load, saturation voltage at I_C/I_B = 10, and compatibility with 3.3 V/5 V logic-level drive circuits.

Technical Context

This BJT operates in active and saturation regions with defined base-emitter turn-on threshold (~0.7 V) and exhibits predictable current amplification across its specified I_C range. Its h_FE binning (40x series) ensures tight gain distribution for consistent stage gain in multi-transistor amplifier chains.

The device supports switching speeds suitable for <1 MHz digital signal routing and linear operation up to f_T = 250 MHz, with guaranteed V_CE(sat) ≤ 0.5 V at I_C = 50 mA and I_B = 5 mA - critical for minimizing conduction loss in discrete driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - Maximum allowable collector-emitter voltage before breakdown; sets upper rail limit for 24 V system interface stages.
I_C (cont)	100 mA - Continuous collector current rating; defines max steady-state load drive capability in SOT-23 footprint.
h_FE @ 10 mA	250–630 - DC current gain range at I_C = 10 mA, V_CE = 1 V; enables stable biasing in emitter-follower or common-emitter gain blocks.
V_CE(sat)	≤ 0.5 V @ I_C/I_B = 10 - Low saturation voltage ensures minimal power loss when used as a saturated switch.
P_D	330 mW @ T_A = 25°C - Power dissipation limit in free-air; requires derating above 25°C ambient per thermal resistance curve.
f_T	250 MHz - Transition frequency; supports RF preamp or high-speed digital switching up to ~100 MHz practical bandwidth.

Pinout & Package

Supplied in JEDEC-standard SOT-23 (TO-236AB) plastic surface-mount package with gull-wing leads, rated for reflow soldering per IPC/JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for bias network; connects to ground or low-impedance return path in common-emitter configuration.
2 (Base)	Control input	Receives current-limited drive signal; requires series resistor to limit I_B and ensure safe saturation.
3 (Collector)	Current source terminal	Connects to load or pull-up; carries amplified I_C; voltage swing limited by V_CEO rating.

Key Features

Feature	Design Value
High h_FE binning (40x)	Guaranteed 250–630 gain range enables predictable DC bias without trimming in production amplifiers.
SOT-23 thermal performance	330 mW P_D with 200°C/W θ_JA allows >70 mA continuous drive at 50°C ambient without heatsinking.
Low V_CE(sat)	≤ 0.5 V at I_C = 50 mA ensures <25 mW conduction loss - critical for battery-powered switch-mode control.
f_T = 250 MHz	Supports wideband analog signal buffering and fast edge-rate digital switching up to 100 MHz.

Applications

LED Driver Stage

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU outputs with current limiting via base resistor.

IC Role / Device Role / Timing Role: Discrete current-switching element replacing integrated LED drivers where cost or layout constraints favor SMT discretes.

Use Value: V_CE(sat) ≤ 0.5 V minimizes voltage drop across transistor, preserving LED forward voltage margin at low supply rails.

Use Scenario: Amplifying weak sensor signals (e.g., thermistor divider output) before ADC sampling in embedded systems.

IC Role / Device Role / Timing Role: Common-emitter DC amplifier stage providing fixed gain and impedance transformation between passive sensor and microcontroller input.

Use Value: Tight h_FE binning ensures repeatable gain across production units without calibration.

Relay Coil Driver

Level-Shifting Interface

Use Scenario: Switching 12 V relay coils drawing up to 80 mA using 3.3 V logic-level control signals.

IC Role / Device Role / Timing Role: Saturated switch interfacing low-voltage logic to higher-voltage inductive loads with flyback diode protection.

Use Value: I_C = 100 mA rating and robust SOA allow reliable coil energization without secondary buffering.

Use Scenario: Translating 1.8 V logic signals to 5 V domains in mixed-supply digital subsystems.

IC Role / Device Role / Timing Role: Emitter-follower level shifter providing bidirectional voltage translation with minimal propagation delay.

Use Value: f_T = 250 MHz supports clean edge integrity up to 20 MHz data rates without added capacitance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847C,215 (Nexperia)	h_FE = 420–800 @ 10 mA; V_CEO = 45 V; same SOT-23 package.	Higher V_CEO suits 36 V industrial interfaces; wider h_FE range may require tighter bias design.	Select when higher breakdown margin or broader gain tolerance is acceptable.
MMBT3904LT1G (ON Semiconductor)	h_FE = 100–300 @ 10 mA; V_CEO = 40 V; identical pinout and footprint.	Lower h_FE demands higher base drive current; better suited for high-speed switching than linear gain stability.	Prefer for cost-sensitive, high-volume switching-only use cases where gain consistency is secondary.

Compared with BC818-40WE6327, BC847C offers higher voltage headroom but looser gain control, while MMBT3904LT1G trades gain precision for lower cost and faster switching - making the BC818-40WE6327 optimal for stable-gain analog amplification in compact 3.3 V systems.

Availability

BC818-40WE6327 is available at Aetrix Electronics and suitable for LED driver stages, microcontroller GPIO expansion, relay coil driving, and level-shifting interfaces requiring stable component supply and SOT-23 footprint compatibility.

Supply support for BC818-40WE6327 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and discrete devices with global manufacturing and quality certification (IATF 16949, ISO 9001).

The BC818 series belongs to Infineon's general-purpose BJT portfolio, designed specifically for cost-effective, high-reliability discrete amplification and switching in consumer, industrial, and automotive control modules.

FAQ

What is the maximum safe operating temperature for BC818-40WE6327?

The device has a junction temperature limit of 150°C and thermal resistance θ_JA = 200°C/W. At 100 mA collector current and 0.5 V V_CE(sat), power dissipation is 50 mW; this allows operation up to 125°C ambient with no derating. Above that, linear derating applies per datasheet curve.

Can BC818-40WE6327 replace BC847B in existing designs?

Yes, with verification: both are SOT-23 NPN transistors, but BC818-40WE6327 has higher h_FE (250–630 vs. 200–450) and lower V_CEO (30 V vs. 45 V). If circuit gain and voltage margin permit, direct substitution is viable; otherwise, base resistor adjustment may be needed.

Is BC818-40WE6327 suitable for audio preamplifier applications?

It is appropriate for low-noise, single-stage audio preamps where gain stability and low distortion are prioritized over ultra-low noise figure. Its h_FE consistency and f_T support bandwidth up to 20 kHz with proper biasing; however, dedicated low-noise BJTs like BC549C offer better NF below 1 kHz.

Does BC818-40WE6327 support Pb-free reflow profiles?

Yes - it complies with JEDEC J-STD-020D.3 for lead-free soldering, with peak reflow temperature up to 260°C for 30 seconds. The SOT-23 package is qualified for standard SnAgCu profiles, and moisture sensitivity level is MSL 1 (unlimited floor life at ≤30°C/60% RH).

BC818-40WE6327 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Bulk

Product Status:: Active

Transistor Type:: -

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 25 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 100mA, 1V

Power - Max:: 500 mW

Frequency - Transition:: 170MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT323-3-1

BC818-40WE6327 FAQ

1.How can I place an order for BC818-40WE6327 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC818-40WE6327 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 BC818-40WE6327 reliable?

The price and inventory of BC818-40WE6327 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC818-40WE6327 is usually 5 days.

3.What payment methods are accepted for BC818-40WE6327?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC818-40WE6327 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC818-40WE6327?

BC818-40WE6327 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC818-40WE6327 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 BC818-40WE6327?

For technical support, including BC818-40WE6327 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC818-40WE6327 requirements.

6.How does Aetrix verify that BC818-40WE6327 is sourced from the original manufacturer or authorized distributors?

All BC818-40WE6327 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 BC818-40WE6327 meets industry standards.

7.What is the process for return or replacement of BC818-40WE6327?

All BC818-40WE6327 units undergo pre-shipment inspection (PSI). If there is an issue with BC818-40WE6327, 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 BC818-40WE6327 part is unused and in its original packaging.

Return procedure for BC818-40WE6327:

1.Submit a request within 90 days.

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

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…