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

Infineon Technologies BC818K40E6327HTSA1

Name: BC818K40E6327HTSA1
Brand: Infineon Technologies
SKU: BC818K40E6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC818K40E6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

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

Datasheet:: BC818K40E6327HTSA1.pdf

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

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Product details

Overview

BC818K40E6327HTSA1 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. It serves as a low-saturation switching or linear amplification device in automotive body control modules, industrial sensor signal conditioning, and power supply feedback paths.

For engineers reviewing the BC818K40E6327HTSA1 datasheet, BC818K40E6327HTSA1 pinout, BC818K40E6327HTSA1 application, or BC818K40E6327HTSA1 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data (R_thJS ≤ 70 K/W), and real-world use context for production-grade design-in.

Technical Context

This NPN bipolar junction transistor operates in active, saturation, and cutoff regions with guaranteed DC current gain across I_C = 100 mA to 500 mA at V_CE = 1 V. Its f_T = 170 MHz enables stable operation up to mid-VHF range in oscillator and RF driver stages.

Designed for automotive-grade reliability, it meets AEC-Q101 stress test requirements including high-temperature reverse bias, temperature cycling, and humidity testing. The SOT-23 package supports automated placement and reflow soldering per JEDEC J-STD-020.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe operating voltage in switching applications.
I_C	500 mA - Continuous collector current rating; supports medium-power load switching without forced cooling.
h_FE	250–630 - DC current gain at I_C = 100 mA, V_CE = 1 V; ensures robust base drive margin in digital logic interfacing.
V_CE(sat)	≤ 0.7 V - Collector-emitter saturation voltage at I_C = 500 mA / I_B = 50 mA; minimizes conduction loss in high-duty-cycle switches.
f_T	170 MHz - Transition frequency at I_C = 50 mA, V_CE = 5 V; validates suitability for broadband amplification up to ~100 MHz.
R_thJS	≤ 70 K/W - Junction-to-solder-point thermal resistance; enables 500 mW dissipation at T_S ≤ 115 °C on standard PCB copper area.
AEC-Q101	Qualified - Certified for automotive electronic systems per stress test requirements; supports under-hood and chassis-mounted designs.

Pinout & Package

BC818K40E6327HTSA1 uses the SOT-23 surface-mount plastic package (3-pin, 1.3 mm × 2.9 mm footprint) with standard lead finish and RoHS-compliant termination.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Current sink node; connects to ground or low-side return path in common-emitter configurations.
2 (Base)	B	Control input; requires current-limited drive (e.g., 5–50 mA) to achieve specified saturation performance.
3 (Collector)	C	Current source node; interfaces with load (e.g., relay coil, LED string, MOSFET gate) in switching topologies.

Key Features

Feature	Design Value
High h_FE group (40)	Guaranteed h_FE ≥ 250 at I_C = 100 mA - reduces base drive circuit complexity and power consumption.
Low V_CE(sat)	≤ 0.7 V at I_C = 500 mA - limits conduction loss to < 350 mW in saturated switch mode.
AEC-Q101 qualified	Validated for automotive electronics - eliminates need for additional qualification testing in Tier-1 BOMs.
Pb-free & RoHS compliant	Meets EU Directive 2011/65/EU - supports global manufacturing compliance without exemption requests.

Applications

Automotive Body Control Unit

Industrial Sensor Signal Conditioning

Use Scenario: Driving 12 V solenoid valves and small relays in door lock, window lift, and lighting control modules.

IC Role / Device Role / Timing Role: Medium-current NPN switch providing galvanic isolation between microcontroller GPIO and inductive loads.

Use Value: Low V_CE(sat) and high h_FE reduce MCU GPIO loading and eliminate need for external Darlington stages.

Use Scenario: Amplifying low-level analog outputs (e.g., 0–100 mV) from thermocouples or strain gauges in PLC I/O modules.

IC Role / Device Role / Timing Role: Linear amplifier in common-emitter configuration with emitter degeneration resistor for stable gain.

Use Value: High f_T and consistent h_FE across temperature ensure accurate DC-coupled amplification up to 50 kHz.

DC-DC Converter Feedback Path

LED Driver for Status Indication

Use Scenario: Translating error amplifier output to optocoupler input in isolated flyback controllers.

IC Role / Device Role / Timing Role: Level-shifting interface transistor enabling precise current-mode feedback across isolation barrier.

Use Value: Tight h_FE binning (group 40) ensures predictable current transfer ratio and loop stability.

Use Scenario: Direct-driving 20 mA indicator LEDs from 3.3 V or 5 V logic rails in medical and test equipment front panels.

IC Role / Device Role / Timing Role: Saturated switch controlling LED anode connection to supply rail.

Use Value: V_CE(sat) ≤ 0.7 V maintains > 85% LED forward voltage utilization at full brightness.

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
BC817-40,215 (Nexperia)	V_CEO = 45 V, h_FE = 250–630, same SOT-23 package, non-AEC-Q101 rated	Higher voltage headroom but lacks automotive qualification; suitable for industrial-only designs	Select when V_CEO > 25 V is required and AEC-Q101 is not mandated
MMBT4401LT1G (ON Semiconductor)	V_CEO = 40 V, h_FE = 100–300, SOT-23, AEC-Q101 qualified, lower max h_FE	Broader voltage margin and same qualification, but reduced current gain limits base drive efficiency	Select when higher V_CEO and AEC-Q101 are both needed, and gain margin can be relaxed

Compared with BC818K40E6327HTSA1, BC817-40,215 offers higher voltage tolerance without automotive validation, while MMBT4401LT1G provides AEC-Q101 compliance at the cost of lower h_FE, affecting base drive simplicity in high-gain-critical circuits.

Availability

BC818K40E6327HTSA1 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor signal conditioning, and DC-DC converter feedback paths requiring stable component supply and long-term lifecycle support.

Supply support for BC818K40E6327HTSA1 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 electronics, and industrial control ICs, with global R&D and wafer fabrication infrastructure.

This part belongs to Infineon's BC817/BC818K family of AEC-Q101-qualified general-purpose NPN transistors, designed specifically for automotive and industrial signal switching and amplification where reliability and parametric consistency are critical.

FAQ

Is BC818K40E6327HTSA1 pin-compatible with BC817-40 variants?

Yes - both share identical SOT-23 pinout (Emitter-Base-Collector on pins 1-2-3) and mechanical footprint. However, BC818K40 has V_CEO = 25 V versus BC817-40's 45 V, so direct substitution requires verification of maximum collector-emitter voltage in the target circuit.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature is 150 °C. At ambient temperatures up to 85 °C and with board-level thermal relief (e.g., 1 cm² copper pour), the device sustains 500 mA continuous collector current while maintaining T_j ≤ 150 °C, per its R_thJS ≤ 70 K/W rating.

Does BC818K40E6327HTSA1 support pulsed operation beyond its DC ratings?

Yes - pulse operation up to I_C = 1000 mA is permitted with duty cycle ≤ 2% and pulse width < 300 µs, as defined in the datasheet's permissible pulse load curves. This enables short-duration surge handling in motor commutation or ESD protection circuits.

How does the h_FE group "40" translate to actual gain values across temperature?

Group 40 guarantees h_FE ≥ 250 at I_C = 100 mA, V_CE = 1 V, T_A = 25 °C. At -40 °C and 105 °C, minimum h_FE remains ≥ 160 and ≥ 200 respectively, ensuring stable gain over full automotive temperature range.

BC818K40E6327HTSA1 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:: 500 mW

Frequency - Transition:: 170MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23

BC818K40E6327HTSA1 FAQ

1.How can I place an order for BC818K40E6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC818K40E6327HTSA1 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 BC818K40E6327HTSA1 reliable?

The price and inventory of BC818K40E6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC818K40E6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BC818K40E6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC818K40E6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC818K40E6327HTSA1?

BC818K40E6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC818K40E6327HTSA1 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 BC818K40E6327HTSA1?

For technical support, including BC818K40E6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC818K40E6327HTSA1 requirements.

6.How does Aetrix verify that BC818K40E6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BC818K40E6327HTSA1 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 BC818K40E6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BC818K40E6327HTSA1?

All BC818K40E6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BC818K40E6327HTSA1, 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 BC818K40E6327HTSA1 part is unused and in its original packaging.

Return procedure for BC818K40E6327HTSA1:

1.Submit a request within 90 days.

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

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