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

Infineon Technologies BC817K40WE6327HTSA1

Name: BC817K40WE6327HTSA1
Brand: Infineon Technologies
SKU: BC817K40WE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC817K40WE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC817K40WE6327HTSA1.pdf

Description:: TRANS NPN 45V 0.5A PG-SOT323

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Product details

Overview

BC817K40WE6327HTSA1 from Infineon Technologies is an NPN silicon general-purpose audio-frequency transistor with 45 V V_CEO, 500 mA I_C, 40–250 h_FE (group K40), 0.7 V V_CE(sat) at 500 mA/50 mA, and SOT-323 (SC-70) package. It serves as a low-voltage switching or linear amplification device in power management and signal conditioning circuits.

For engineers reviewing the BC817K40WE6327HTSA1 datasheet, BC817K40WE6327HTSA1 pinout, BC817K40WE6327HTSA1 application, or BC817K40WE6327HTSA1 equivalent, key selection criteria include guaranteed h_FE group K40 (min 250 @ 100 mA), low saturation voltage for efficient switching, AEC-Q101 qualification for automotive use, and thermal resistance R_thJS ≤ 80 K/W in SOT-323.

Technical Context

This NPN bipolar junction transistor operates in active, saturation, and cutoff regions for analog amplification and digital switching. Its h_FE group K40 ensures minimum DC current gain of 250 at I_C = 100 mA and V_CE = 1 V, with stable performance across −40 °C to 105 °C ambient.

The device features low V_CE(sat) (≤ 0.7 V) and V_BE(sat) (≤ 1.2 V) under I_C = 500 mA / I_B = 50 mA conditions, enabling high-efficiency low-side switching in 3.3 V/5 V logic-driven loads, while its 170 MHz f_T supports audio-band and low-speed digital signal handling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; enables use in 24 V systems with safety margin
I_C	500 mA - Continuous collector current rating; supports medium-power load switching
h_FE (K40)	250–630 - Guaranteed min 250 at 100 mA/1 V; ensures predictable base drive requirements
V_CE(sat)	≤ 0.7 V @ 500 mA/50 mA - Low saturation voltage reduces conduction loss in switching applications
f_T	170 MHz - Transition frequency confirms suitability for audio and sub-MHz digital signal paths
R_thJS	≤ 80 K/W - Thermal resistance from junction to soldering point; defines power derating above 130 °C case temp
P_tot	250 mW @ T_S ≤ 130 °C - Total dissipation limit in SOT-323 package; constrains continuous power handling

Pinout & Package

Package: SOT-323 (SC-70), surface-mount, 3-pin plastic package with standard lead finish and RoHS-compliant construction.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Current sink terminal; connected to ground or low-side reference in common-emitter configurations
2 (Base)	B	Control input; requires ~50 mA drive for full saturation at 500 mA collector load
3 (Collector)	C	Current source terminal; connects to load and supply rail in low-side switch topology

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per stress test requirements (HTOL, TC, HTRB, etc.)
h_FE group K40	Guaranteed h_FE ≥ 250 at 100 mA/1 V; simplifies base resistor design and improves gain consistency
Low V_CE(sat)	≤ 0.7 V at rated I_C/I_B; minimizes power loss and self-heating during on-state operation
Pb-free & RoHS compliant	Meets EU Directive 2011/65/EU; compatible with lead-free reflow soldering profiles
Thermal robustness	Junction temperature rating up to 150 °C; supports operation in engine bay or industrial enclosures

Applications

Automotive Body Control Module

Industrial Sensor Interface

Use Scenario: Driving LED status indicators and small solenoids in door modules and lighting control units.

IC Role / Device Role / Timing Role: NPN low-side switch controlled by 3.3 V microcontroller GPIO.

Use Value: Guaranteed K40 h_FE ensures reliable turn-on with minimal base current; AEC-Q101 qualification validates long-term reliability in vibration-prone environments.

Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor, potentiometer) into ADC inputs.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-output-impedance drive without loading sensitive resistive sensors.

Use Value: Stable h_FE and low V_CE(sat) maintain linearity and minimize offset error across temperature range.

Consumer Power Supply Feedback

IoT Peripheral Driver

Use Scenario: Optocoupler driver in isolated flyback feedback loops for AC/DC adapters.

IC Role / Device Role / Timing Role: Fast-switching NPN stage translating PWM error signal to optocoupler LED current.

Use Value: 170 MHz f_T and low C_cb (3 pF) support clean edge transitions up to ~100 kHz switching frequencies.

Use Scenario: Controlling buzzer, relay coil, or RGB LED segment in battery-powered smart home devices.

IC Role / Device Role / Timing Role: General-purpose discrete switch interfacing MCU I/O pins to higher-current external loads.

Use Value: SOT-323 footprint saves PCB area; 250 mW P_tot and R_thJS ≤ 80 K/W allow sustained 300 mA operation at 60 °C ambient.

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
BC817-40W,115 (Nexperia)	Same h_FE group (40), identical SOT-323 package, but rated P_tot = 300 mW @ T_S ≤ 150 °C	Higher power dissipation margin; slightly different thermal profile due to package variant	Prefer when >250 mW continuous dissipation is required and board layout allows same footprint
MMBT3904LT1G (ON Semiconductor)	h_FE min 100 (not grouped), V_CEO = 40 V, V_CE(sat) = 0.2 V @ 10 mA/1 mA - optimized for low-current logic-level switching	Lower saturation voltage at light loads, but not AEC-Q101 qualified and no guaranteed h_FE group	Choose for cost-sensitive consumer designs where automotive qualification and high-current gain consistency are not required

Compared with BC817K40WE6327HTSA1, BC817-40W offers higher thermal headroom in same footprint, while MMBT3904LT1G trades guaranteed gain and automotive qualification for lower V_CE(sat) at microamp/milliamp levels - making each suitable for distinct reliability or efficiency priorities.

Availability

BC817K40WE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power supply feedback circuits, and IoT peripheral drivers requiring stable component supply and AEC-Q101 compliance.

Supply support for BC817K40WE6327HTSA1 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 and discrete devices.

This part belongs to the BC817K/BC818K family of AEC-Q101-qualified general-purpose NPN transistors designed for reliable switching and amplification in harsh-environment automotive and industrial applications.

FAQ

Is BC817K40WE6327HTSA1 pin-compatible with BC817-40W?

Yes - both use SOT-323 (SC-70) package with identical pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. Mechanical and soldering compatibility is confirmed, though thermal ratings differ (BC817K40W: P_tot = 250 mW @ T_S ≤ 130 °C; BC817-40W: 300 mW @ T_S ≤ 150 °C).

What does the 'K40' suffix indicate in BC817K40WE6327HTSA1?

The 'K40' denotes h_FE group classification: minimum DC current gain of 250 at I_C = 100 mA and V_CE = 1 V, with typical values up to 630. This grouping ensures consistent base drive design across production lots and eliminates need for post-manufacture h_FE binning in circuit design.

Can BC817K40WE6327HTSA1 replace BC847C in existing designs?

No - BC847C has V_CEO = 45 V but h_FE group C (420–800) and SOT-23 package. While electrical parameters overlap, the SOT-323 footprint differs from SOT-23, requiring PCB redesign. Also, BC847C lacks AEC-Q101 qualification, limiting automotive use.

Does this transistor support pulsed operation beyond its DC ratings?

Yes - pulse operation is supported per Infineon's permissible pulse load curves. At duty cycle D = 0.01 and pulse width t_p = 100 µs, peak current can reach ~1.5 A. Derating must follow R_thJS ≤ 80 K/W and junction temperature limits (T_j ≤ 150 °C) using transient thermal impedance data from Application Note AN077.

BC817K40WE6327HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 45 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:: 250 mW

Frequency - Transition:: 170MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT323

BC817K40WE6327HTSA1 FAQ

1.How can I place an order for BC817K40WE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC817K40WE6327HTSA1 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 BC817K40WE6327HTSA1 reliable?

The price and inventory of BC817K40WE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817K40WE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BC817K40WE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817K40WE6327HTSA1 transactions.

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4.How is shipping managed for BC817K40WE6327HTSA1?

BC817K40WE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC817K40WE6327HTSA1 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 BC817K40WE6327HTSA1?

For technical support, including BC817K40WE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817K40WE6327HTSA1 requirements.

6.How does Aetrix verify that BC817K40WE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BC817K40WE6327HTSA1 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 BC817K40WE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BC817K40WE6327HTSA1?

All BC817K40WE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BC817K40WE6327HTSA1, 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 BC817K40WE6327HTSA1 part is unused and in its original packaging.

Return procedure for BC817K40WE6327HTSA1:

1.Submit a request within 90 days.

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

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