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

Infineon Technologies BCW66KFE6327HTSA1

Name: BCW66KFE6327HTSA1
Brand: Infineon Technologies
SKU: BCW66KFE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW66KFE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

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

Datasheet:: BCW66KFE6327HTSA1.pdf

Description:: TRANS NPN 45V 0.8A PG-SOT23

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Product details

Overview

BCW66KFE6327HTSA1 from Infineon Technologies is an NPN silicon bipolar junction transistor designed for general-purpose audio-frequency amplification and switching. It delivers high DC current gain (h_FE = 75–630 depending on I_C and grouping), low V_CE(sat) (0.3 V @ 100 mA/10 mA), and supports I_C up to 800 mA continuous - used in discrete amplifier stages, load switches, and driver circuits in automotive body electronics.

For engineers reviewing the BCW66KFE6327HTSA1 datasheet, BCW66KFE6327HTSA1 pinout, BCW66KFE6327HTSA1 application, or BCW66KFE6327HTSA1 equivalent, key selection criteria include verified h_FE grouping (F/G/H), SOT23 thermal resistance (R_thJS ≤ 70 K/W), V_CEO = 45 V rating, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This transistor operates as a medium-power NPN BJT with complementary PNP pairing via BCW68. Its f_T = 170 MHz enables stable operation in AF and low-speed digital switching up to ~10 MHz. The device uses epitaxial planar technology with emitter ballasting for improved linearity and thermal stability.

Designed for surface-mount use in SOT23-3 package, it features Pb-free RoHS-compliant construction and meets AEC-Q101 stress testing requirements including HTGB, HTRB, and temperature cycling - confirming suitability for under-hood automotive modules where ambient temperatures reach 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - supports rail voltages up to 40 V in linear amplifier or switch applications without breakdown
I_C (continuous)	800 mA - enables direct drive of small relays, LEDs, or logic-level MOSFET gates
h_FE (I_C = 100 mA)	100–250 - ensures predictable base drive sizing across F/G/H gain groups
V_CE(sat)	0.3 V @ 100 mA/10 mA - minimizes conduction loss and self-heating in saturated switching
f_T	170 MHz - sufficient for audio preamp gain stages and PWM signal buffering
R_thJS	≤ 70 K/W - allows 500 mW dissipation with ≤35 K rise above solder point at T_S = 115 °C
AEC-Q101 qualified	Yes - validated for automotive applications including climate control actuators and lighting drivers

Pinout & Package

SOT23-3 plastic surface-mount package with gull-wing leads; standardized footprint per Infineon outline EHs (pin pitch 0.95 mm, body size 2.9 × 1.3 × 1.0 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Current sink node; connects to ground or low-side return path in common-emitter configuration
2 (Base)	B	Control input requiring current-limited drive (IB ≤ 100 mA) to achieve specified h_FE and saturation
3 (Collector)	C	Current source node; ties to load or positive supply in active/saturation modes

Key Features

Feature	Design Value
High h_FE grouping (F/G/H)	Enables precise current gain binning for production matching in differential pairs or feedback networks
Low V_CE(sat) at high I_C	Reduces power loss and thermal stress when switching 500 mA loads (e.g., solenoid drivers)
AEC-Q101 qualification	Confirms robustness against thermal cycling, humidity, and mechanical shock in automotive ECUs
Pb-free RoHS compliance	Meets EU directive requirements for lead-free assembly and end-of-life recycling
Complementary PNP pair (BCW68)	Supports push-pull output stages without cross-manufacturer sourcing complexity

Applications

Automotive Door Module Driver

Industrial Fan Speed Controller

Use Scenario: Driving window lift motor relays and LED status indicators in door control units.

IC Role / Device Role / Timing Role: Discrete NPN switch handling 300–600 mA inductive loads with fast turn-off and low saturation loss.

Use Value: Enables compact SOT23 implementation with <0.4 V drop at full load, reducing PCB heat density and eliminating need for heatsinking.

Use Scenario: Regulating 24 V DC brushless fan speed via PWM-driven base current in HVAC systems.

IC Role / Device Role / Timing Role: Low-cost linear current amplifier stage converting microcontroller PWM into proportional collector current.

Use Value: Delivers stable h_FE-based current scaling across temperature (−40 °C to +125 °C), ensuring consistent airflow control.

Audio Pre-amplifier Stage

Smart Meter Load Switch

Use Scenario: First-stage voltage amplification in battery-powered smoke detector audio alarms.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier biased at I_C = 1 mA with f_T-limited bandwidth.

Use Value: Provides >100 dB gain at 1 kHz with minimal distortion due to high h_FE and low C_cb (3 pF), extending battery life via low quiescent current.

Use Scenario: Isolating metering IC from mains-connected relay coils in Class 0.5 smart electricity meters.

IC Role / Device Role / Timing Role: High-reliability interface transistor switching 800 mA coil current with controlled dI/dt.

Use Value: AEC-Q101 validation ensures long-term parametric stability under repeated surge events and thermal cycling over 15-year field life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847BW	Lower I_C (100 mA), higher h_FE spread (110–800), no AEC-Q101 qualification	Not suitable for automotive under-hood use; limited to consumer-grade signal switching	Select only for non-automotive, low-current (<150 mA), cost-sensitive designs
MMBT3904LT1G	Same V_CEO/I_C, but h_FE min = 100 (no grouping), R_thJS = 200 K/W (higher thermal resistance)	Requires larger copper area or derating above 250 mA; not AEC-Q101 qualified	Acceptable for industrial controls below 125 °C ambient, but not for automotive or high-reliability thermal environments

Compared with BC847BW and MMBT3904LT1G, BCW66KFE6327HTSA1 uniquely combines AEC-Q101 qualification, 800 mA current capability, and gain binning - making it the only choice for automotive body electronics requiring both reliability and medium-power discrete switching.

Availability

BCW66KFE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial motor drivers, and battery-powered audio alarm systems requiring stable component supply across multi-year production cycles.

Supply support for BCW66KFE6327HTSA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and sensor solutions, with global manufacturing and R&D centers.

BCW66K belongs to Infineon's BCW series of general-purpose bipolar transistors engineered for automotive-grade reliability and high-volume cost efficiency in discrete analog and switching functions.

FAQ

What is the maximum allowable junction temperature for BCW66KFE6327HTSA1?

The absolute maximum junction temperature (T_j) is 150 °C, as specified in the Infineon datasheet. Operation beyond this limit risks permanent degradation of h_FE and increased leakage. Derating is required above T_S = 115 °C to maintain safe T_j, using R_thJS ≤ 70 K/W and P_tot = 500 mW as baseline limits.

Does BCW66KFE6327HTSA1 support pulsed current operation beyond its DC rating?

Yes - peak collector current I_CM is rated at 1 A for pulse widths ≤ 10 ms with duty cycle ≤ 2%. This enables short-duration inrush current handling (e.g., relay coil energization) without exceeding thermal limits, provided average power remains within 500 mW.

How does the h_FE grouping (F/G/H) affect circuit design?

Each group defines guaranteed minimum h_FE at specific test conditions: F = 75, G = 110, H = 180 (I_C = 100 µA–10 mA). Designers select group based on required base drive margin - e.g., Group H reduces base resistor tolerance sensitivity in high-gain amplifier stages.

Is BCW66KFE6327HTSA1 pin-compatible with BCW68?

No - BCW66K is NPN with pinout E-B-C (1-2-3), while BCW68 is PNP with identical SOT23-3 mechanical footprint but reversed polarity and pin function (C-B-E). They are complementary in electrical behavior but require separate PCB layouts or dual-footprint designs.

BCW66KFE6327HTSA1 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:: Last Time Buy

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 800 mA

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

Vce Saturation (Max) @ Ib, Ic:: 450mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 20nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 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

BCW66KFE6327HTSA1 FAQ

1.How can I place an order for BCW66KFE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW66KFE6327HTSA1 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 BCW66KFE6327HTSA1 reliable?

The price and inventory of BCW66KFE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW66KFE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCW66KFE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW66KFE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW66KFE6327HTSA1?

BCW66KFE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW66KFE6327HTSA1 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 BCW66KFE6327HTSA1?

For technical support, including BCW66KFE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW66KFE6327HTSA1 requirements.

6.How does Aetrix verify that BCW66KFE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCW66KFE6327HTSA1 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 BCW66KFE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCW66KFE6327HTSA1?

All BCW66KFE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCW66KFE6327HTSA1, 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 BCW66KFE6327HTSA1 part is unused and in its original packaging.

Return procedure for BCW66KFE6327HTSA1:

1.Submit a request within 90 days.

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

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