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

Infineon Technologies BC 818-40 E6327

Name: BC 818-40 E6327
Brand: Infineon Technologies
SKU: BC 818-40 E6327
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC 818-40 E6327

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BC 818-40 E6327.pdf

Description:: TRANS NPN 25V 0.5A PG-SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC 818-40 E6327 from Infineon Technologies is an NPN silicon general-purpose audio-frequency transistor with V_CEO = 25 V, I_C = 500 mA, h_FE = 250–630 (at I_C = 100 mA), V_CE(sat) ≤ 0.7 V (I_C = 500 mA, I_B = 50 mA), and SOT-23 package - used in low-voltage switching and linear amplification stages of automotive body control modules and industrial sensor signal conditioning circuits.

For engineers reviewing the BC 818-40 E6327 datasheet, BC 818-40 E6327 pinout, BC 818-40 E6327 application, or BC 818-40 E6327 equivalent, this page delivers verified electrical parameters, thermal derating curves, AEC-Q101 qualification status, and direct substitution guidance for discrete BJT selection in cost-sensitive, high-reliability embedded systems.

Technical Context

This transistor operates as a medium-current, low-saturation-voltage NPN switch or amplifier in DC-coupled and AC-coupled configurations. Its h_FE group "40" guarantees minimum DC current gain of 250 at I_C = 100 mA and V_CE = 1 V, with typical f_T = 170 MHz enabling stable operation up to mid-VHF range.

Thermal design is constrained by R_thJS ≤ 70 K/W (SOT-23) and P_tot = 500 mW at T_S ≤ 115 °C. Junction temperature must remain ≤ 150 °C under continuous conduction, with ICBO ≤ 50 µA at 150 °C confirming robust high-temperature leakage performance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum collector-emitter voltage before breakdown; defines safe operating voltage headroom in 12 V/24 V automotive supply rails.
I_C	500 mA - Continuous collector current rating; supports driving small relays, LEDs, or logic-level interface buffers without heatsinking.
h_FE (min/typ/max)	250 / 400 / 630 - Confirmed DC current gain spread across h_FE group "40"; enables predictable base drive sizing for saturation switching.
V_CE(sat)	≤ 0.7 V @ I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes power loss and self-heating in switching applications.
f_T	170 MHz typ - Transition frequency supports stable small-signal amplification up to ~100 MHz with adequate gain margin.
R_thJS	≤ 70 K/W - Junction-to-solder-point thermal resistance; allows accurate PCB copper pour sizing for thermal management.
AEC-Q101	Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling.

Pinout & Package

BC 818-40 E6327 is housed in a standard SOT-23 plastic surface-mount package with gull-wing leads, optimized for automated placement and reflow soldering on 1.6 mm thick FR-4 PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Current sink node; connects to ground or low-side return path; requires low-impedance trace for stable biasing.
2 (Base)	B	Control input; driven via current-limiting resistor; sensitive to ESD due to thin oxide layer.
3 (Collector)	C	Current source node; connects to load or pull-up; exposed pad not present - no thermal enhancement option.

Key Features

Feature	Design Value
High h_FE group "40"	Guaranteed h_FE ≥ 250 at I_C = 100 mA ensures reliable saturation with minimal base drive current.
Low V_CE(sat)	≤ 0.7 V reduces conduction loss to < 350 mW at full 500 mA load, easing thermal design.
AEC-Q101 qualified	Validated for automotive under-hood and cabin applications requiring extended temperature and reliability compliance.
Pb-free & RoHS compliant	Meets EU Directive 2011/65/EU; compatible with lead-free reflow profiles up to 260 °C peak.

Applications

Automotive Door Module Switching

Industrial Sensor Signal Amplification

Use Scenario: Driving window lift motor enable lines and door lock solenoids in 12 V battery-powered body control units.

IC Role / Device Role / Timing Role: NPN switch controlling 300–500 mA inductive loads with fast turn-on/off and low standby current.

Use Value: V_CE(sat) ≤ 0.7 V limits power dissipation to < 350 mW, eliminating need for heatsink in space-constrained modules.

Use Scenario: Amplifying low-level analog outputs (e.g., 0–100 mV) from RTD or thermistor-based temperature sensors.

IC Role / Device Role / Timing Role: Linear-mode common-emitter amplifier with fixed bias network and emitter degeneration resistor.

Use Value: h_FE ≥ 250 ensures stable gain over temperature (−40 °C to 125 °C), reducing calibration drift.

Consumer Appliance Power Sequencing

Medical Diagnostic Equipment Interface

Use Scenario: Enabling 5 V/3.3 V LDO regulators in sequence during system power-up in washing machine mainboards.

IC Role / Device Role / Timing Role: Discrete level-shifting switch translating microcontroller GPIO signals to higher-voltage enable inputs.

Use Value: V_CEO = 25 V provides 10 V margin above 12 V rail, preventing latch-up during transient surges.

Use Scenario: Isolating microcontroller I/O pins from external patient-connected analog front-end circuitry.

IC Role / Device Role / Timing Role: Current-buffering stage providing galvanic separation and drive capability for optocoupler LED drivers.

Use Value: ICBO ≤ 50 µA at 150 °C ensures negligible leakage-induced false triggering in safety-critical signal paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching and amplification applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40 E6327	V_CEO = 45 V (vs. 25 V); same h_FE group, SOT-23 package, identical pinout.	Higher voltage headroom suits 24 V industrial systems; less optimal for 12 V automotive where lower V_CEO improves ruggedness.	Select when operating above 15 V supply or needing enhanced avalanche margin.
MMBT4401LT1G	V_CEO = 40 V, h_FE = 100–300 (min 100), V_CE(sat) = 0.75 V @ I_C = 500 mA - lower gain, slightly higher saturation voltage.	Broader h_FE spread increases base resistor tolerance sensitivity; widely stocked but not AEC-Q101 qualified.	Choose for non-automotive cost-sensitive designs where qualification is not required.

Compared with BC818-40 E6327, BC817-40 offers higher voltage tolerance at identical gain and footprint, while MMBT4401LT1G trades AEC-Q101 compliance and tighter h_FE for broader distributor availability and legacy design continuity.

Availability

BC 818-40 E6327 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer appliance power sequencing, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for BC 818-40 E6327 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 to ISO/TS 16949 and IATF 16949.

The BC817/BC818 family targets cost-effective, high-reliability discrete transistor needs in automotive and industrial applications - emphasizing AEC-Q101 qualification, tight h_FE binning, and thermal robustness in compact SOT packages.

FAQ

Is BC 818-40 E6327 pin-compatible with BC 817-40 E6327?

Yes - both use identical SOT-23 package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector. Mechanical and electrical pinout alignment enables direct PCB footprint reuse, though V_CEO differs (25 V vs. 45 V), requiring voltage-level verification in the target circuit.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature is 150 °C. Derating begins at T_S = 115 °C, where total power dissipation drops linearly to zero at 150 °C. For 500 mW operation, board-level thermal design must maintain solder-point temperature ≤ 115 °C under worst-case ambient and airflow conditions.

Does BC 818-40 E6327 support pulsed operation beyond its DC ratings?

Yes - pulse operation up to I_CM = 1000 mA is permitted with duty cycle D ≤ 2% and pulse width t_p < 300 µs. Permissible peak power scales inversely with pulse duration per the R_thJS vs. t_p curve in Application Note AN077, enabling short-duration surge handling.

How does AEC-Q101 qualification impact design validation for automotive use?

AEC-Q101 qualification confirms successful completion of stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling - eliminating need for duplicate qualification testing by Tier 1 suppliers and accelerating PPAP submission for automotive ECUs and modules.

BC 818-40 E6327 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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:: 330 mW

Frequency - Transition:: 170MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23

BC 818-40 E6327 FAQ

1.How can I place an order for BC 818-40 E6327 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC 818-40 E6327 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 BC 818-40 E6327 reliable?

The price and inventory of BC 818-40 E6327 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC 818-40 E6327 is usually 5 days.

3.What payment methods are accepted for BC 818-40 E6327?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC 818-40 E6327 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC 818-40 E6327?

BC 818-40 E6327 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC 818-40 E6327 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 BC 818-40 E6327?

For technical support, including BC 818-40 E6327 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC 818-40 E6327 requirements.

6.How does Aetrix verify that BC 818-40 E6327 is sourced from the original manufacturer or authorized distributors?

All BC 818-40 E6327 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 BC 818-40 E6327 meets industry standards.

7.What is the process for return or replacement of BC 818-40 E6327?

All BC 818-40 E6327 units undergo pre-shipment inspection (PSI). If there is an issue with BC 818-40 E6327, 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 BC 818-40 E6327 part is unused and in its original packaging.

Return procedure for BC 818-40 E6327:

1.Submit a request within 90 days.

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

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