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

Infineon Technologies BCW66KHE6327HTSA1

Name: BCW66KHE6327HTSA1
Brand: Infineon Technologies
SKU: BCW66KHE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW66KHE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

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

Datasheet:: BCW66KHE6327HTSA1.pdf

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

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Product details

Overview

BCW66KHE6327HTSA1 from Infineon Technologies is an NPN silicon general-purpose audio-frequency transistor in SOT23 package, rated for 45 V V_CEO, 800 mA I_C, and 500 mW P_tot, with h_FE group H (180–250 at 100 µA–10 mA), low V_CE(sat) of 0.3 V @ 100 mA/10 mA, and f_T = 170 MHz - used in discrete amplifier stages and switching circuits in automotive body control modules.

For engineers reviewing the BCW66KHE6327HTSA1 datasheet, BCW66KHE6327HTSA1 pinout, BCW66KHE6327HTSA1 application, or BCW66KHE6327HTSA1 equivalent, key selection criteria include verified h_FE grouping (H), thermal resistance R_thJS ≤ 70 K/W, AEC-Q101 qualification, complementary pairing with BCW68, and SOT23 footprint compatibility for space-constrained PCB layouts.

Technical Context

This NPN bipolar junction transistor operates in linear amplification and saturated switching modes, with guaranteed DC current gain across three test conditions: h_FE ≥ 180 (100 µA–10 mA), ≥ 250 (100 mA), and ≥ 250–400 (500 mA). Its low V_CE(sat) (0.3 V typical @ 100 mA/10 mA) and V_BE(sat) (1.25 V @ same condition) support efficient low-voltage switching in 5 V and 3.3 V logic-driven loads.

The device features f_T = 170 MHz at I_C = 50 mA/V_CE = 5 V, C_cb = 3 pF @ V_CB = 10 V, and C_eb = 40 pF @ V_EB = 0.5 V - enabling stable operation up to mid-VHF range in tuned preamp and oscillator buffer stages without parasitic oscillation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - supports rail-to-rail operation in 24 V automotive subsystems with margin against transients.
I_C	800 mA continuous - drives medium-power relays, LED strings, or small solenoids directly from microcontroller GPIO.
h_FE (Group H)	180–250 @ 100 µA–10 mA - ensures predictable bias stability in Class-A amplifier stages without emitter degeneration.
V_CE(sat)	0.3 V @ 100 mA/10 mA - reduces conduction loss to <30 mW in switching applications, minimizing self-heating.
f_T	170 MHz - enables use in RF driver stages up to ~50 MHz with controlled gain roll-off.
R_thJS	≤70 K/W - allows 500 mW dissipation with ≤35 °C junction-to-solder-point rise, supporting compact thermal layout.
AEC-Q101	Qualified - meets stress-test requirements for automotive electronics including temperature cycling and HTRB.

Pinout & Package

SOT23-3 plastic surface-mount package with gull-wing leads, 1.3 mm pitch, and 2.9 mm × 1.3 mm footprint. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector - marked "EHs" on top surface per Infineon standard.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Current-controlled input node	Accepts 10–100 mA drive current; requires series resistor to limit IB and ensure hFE-dependent saturation.
2 (Emitter)	Reference terminal for V_BE and I_E	Connected to ground or low-impedance return path; critical for stable bias point in common-emitter configuration.
3 (Collector)	Output current sink	Delivers up to 800 mA load current; routed to power rail via minimal trace inductance to avoid switching overshoot.

Key Features

Feature	Design Value
High h_FE group H	Guaranteed 180–250 gain at low-mid current, reducing base drive burden and enabling single-stage amplification.
Low V_CE(sat)	0.3 V typical at 100 mA/10 mA ensures <3% voltage drop in 3.3 V logic-switched loads, preserving headroom.
AEC-Q101 qualified	Validated for automotive under-hood environments including -40 °C to +150 °C operation and humidity exposure.
Complementary PNP pair	BCW68 available for push-pull output stages, matching V_CEO, I_C, and thermal characteristics.
Pb-free RoHS compliance	Meets EU Directive 2011/65/EU with SnAgCu solder compatibility and no exemption reporting required.

Applications

Automotive Body Control Unit

Industrial Sensor Interface

Use Scenario: Driving 12 V relay coils and LED status indicators in door module PCBs.

IC Role / Device Role / Timing Role: Discrete NPN switch replacing integrated drivers where cost and thermal isolation are prioritized.

Use Value: 0.3 V V_CE(sat) limits coil power loss to 30 mW at 100 mA, preventing thermal derating in sealed enclosures.

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

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

Use Value: h_FE ≥ 180 ensures <1% gain error over 0–100 °C ambient, maintaining measurement linearity.

Consumer Audio Preamp Stage

Power Supply Enable Switch

Use Scenario: First-stage amplification in portable speaker ICs before op-amp input, handling 20 Hz–20 kHz signals.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier biased at 1 mA I_C for optimal f_T/noise trade-off.

Use Value: f_T = 170 MHz provides >8× bandwidth margin at 20 kHz, ensuring flat gain response and low phase distortion.

Use Scenario: Enabling 5 V buck converter output during system wake-up, controlled by MCU GPIO.

IC Role / Device Role / Timing Role: High-side or low-side enable switch with fast turn-on (<100 ns) and minimal leakage during sleep.

Use Value: I_CBO ≤ 20 µA at 150 °C prevents false activation in hot ambient, meeting automotive ASIL-B functional safety thresholds.

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
BC817-40,215 (Nexperia)	Same SOT23 package, h_FE = 250–600 (group Q), V_CEO = 45 V, but higher V_CE(sat) = 0.7 V @ 100 mA/10 mA.	Less suitable for low-voltage switching; better for high-gain linear amplification where saturation voltage is secondary.	Select when gain consistency across wide I_C range is critical, not low-loss switching.
MMBT3904LT1G (ON Semiconductor)	Same SOT23, V_CEO = 40 V (5 V lower), h_FE = 100–300 (group 1E), f_T = 300 MHz, but not AEC-Q101 qualified.	Not approved for automotive use; preferred in consumer-grade USB-powered devices requiring higher f_T.	Select for non-automotive designs needing faster switching or tighter h_FE binning, accepting reduced voltage margin.

Compared with BCW66KHE6327HTSA1, BC817-40 offers broader h_FE range but higher conduction loss, while MMBT3904LT1G delivers higher speed and gain uniformity but lacks automotive qualification and voltage rating - making BCW66KHE6327HTSA1 optimal for cost-sensitive, thermally constrained AEC-Q101-compliant switching.

Availability

BCW66KHE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, consumer audio preamplifiers, and power supply enable switches requiring stable component supply and AEC-Q101 assurance.

Supply support for BCW66KHE6327HTSA1 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 security solutions, with global manufacturing and R&D centers.

The BCW66K belongs to Infineon's BCW family of general-purpose bipolar transistors designed for reliable, low-cost discrete switching and amplification in automotive and industrial control systems.

FAQ

What is the exact h_FE range for BCW66KHE6327HTSA1?

The BCW66KHE6327HTSA1 is h_FE group H: minimum 180 at I_C = 100 µA–10 mA/V_CE = 1 V, minimum 250 at I_C = 100 mA/V_CE = 1 V, and minimum 250 at I_C = 500 mA/V_CE = 1 V. This is confirmed in Infineon's 2011-09-30 datasheet revision, page 2.

Is BCW66KHE6327HTSA1 pin-compatible with BCW66G or BCW66F?

Yes - all BCW66 variants (F/G/H) share identical SOT23-3 pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. The suffix denotes h_FE grouping only; electrical pin functions and mechanical footprint are fully interchangeable.

Does BCW66KHE6327HTSA1 support pulsed operation beyond 800 mA?

Yes - peak collector current I_CM is rated at 1 A for pulse widths ≤10 ms (duty cycle ≤2%). This is validated per Infineon's safe operating area curves on page 5, enabling short-duration surge handling in motor commutation or fault detection circuits.

Can BCW66KHE6327HTSA1 replace BCW68 in a circuit?

No - BCW66K is NPN; BCW68 is its complementary PNP counterpart. Direct substitution would invert logic polarity and cause circuit failure. They are intended for paired use in push-pull or differential configurations, not interchange.

BCW66KHE6327HTSA1 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:: 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

BCW66KHE6327HTSA1 FAQ

1.How can I place an order for BCW66KHE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW66KHE6327HTSA1 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 BCW66KHE6327HTSA1 reliable?

The price and inventory of BCW66KHE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW66KHE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCW66KHE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW66KHE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW66KHE6327HTSA1?

BCW66KHE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW66KHE6327HTSA1 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 BCW66KHE6327HTSA1?

For technical support, including BCW66KHE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW66KHE6327HTSA1 requirements.

6.How does Aetrix verify that BCW66KHE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCW66KHE6327HTSA1 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 BCW66KHE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCW66KHE6327HTSA1?

All BCW66KHE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCW66KHE6327HTSA1, 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 BCW66KHE6327HTSA1 part is unused and in its original packaging.

Return procedure for BCW66KHE6327HTSA1:

1.Submit a request within 90 days.

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

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