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

Nexperia USA Inc. BCW66GR

Name: BCW66GR
Brand: Nexperia USA Inc.
SKU: BCW66GR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW66GR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCW66GR.pdf

Description:: TRANS NPN 45V 0.8A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,455

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Product details

Overview

BCW66GR from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT23 (TO-236AB) package, rated for 45 V V_CEO, 800 mA continuous I_C, and 250–600 h_FE at I_C = 100 mA. It serves as a compact, thermally robust switching or linear amplification device in automotive body electronics, power management blocks, and industrial sensor interface circuits.

For engineers reviewing the BCW66GR datasheet, BCW66GR pinout, BCW66GR application, or BCW66GR equivalent, this page delivers verified electrical parameters, thermal derating behavior, base-emitter/collector-emitter saturation voltages under pulsed and DC conditions, and validated automotive-grade reliability data - all critical for gate drive, load switching, and signal buffering designs.

Technical Context

This discrete NPN bipolar junction transistor operates with fixed current gain (h_FE) binned per variant (F/G/H), supporting DC and pulsed switching up to 1 A peak I_CM. Its V_CEsat ≤ 450 mV at I_C = 500 mA / I_B = 50 mA enables low-loss switching in 3.3 V–5 V logic-driven loads.

Thermal resistance R_th(j-a) = 500 K/W on FR4 PCB defines its power handling limit of 250 mW at T_amb = 25 °C, derating linearly above 25 °C per Figure 1. Junction temperature is rated to 150 °C, matching automotive under-hood ambient requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage with base open; sets upper rail limit for 24 V automotive and 36 V industrial supply rails.
I_C (continuous)	800 mA - Continuous collector current rating; supports medium-power switching in LED drivers and relay coils.
h_FE	250–600 @ V_CE = 1 V, I_C = 100 mA - Confirmed DC current gain range for BCW66GR (H-grade); ensures stable base drive sizing across temperature.
V_CEsat	≤ 450 mV @ I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching.
P_tot	250 mW @ T_amb = 25 °C - Total power dissipation limit on standard FR4 PCB; requires thermal layout planning for >100 mA average loads.
T_j max	150 °C - Maximum junction temperature; validates suitability for under-dash automotive modules and industrial control enclosures.
AEC-Q101	Qualified - Passes stress testing per Automotive Electronics Council standard for discrete semiconductors; required for Tier-1 automotive component sourcing.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package: 3-pin, small-outline, lead-free, RoHS-compliant. Dimensions: 2.9 mm × 1.3 mm × 1.0 mm (L × W × H), 0.95 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires series resistor to limit I_B ≤ 100 mA (absolute max) and ensure h_FE-based I_C scaling.
2	Emiter (E)	Reference terminal for biasing; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	High-current output node; handles switched load current up to 800 mA DC or 1 A pulsed; routed to power rail or load.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including body control modules and lighting systems per stress test requirements.
High h_FE binning (H-grade)	250–600 gain range reduces base drive current variability and improves consistency in production batch designs.
Low V_CEsat	≤ 450 mV at full-rated I_C/I_B lowers power loss and thermal rise in space-constrained PCB layouts.
SOT23 footprint compatibility	Standard 0.95 mm pitch enables drop-in replacement with BC846/BC847/BC817 families in existing reflow processes.
150 °C junction rating	Supports operation in sealed enclosures or near heat sources without derating below -40 °C to +125 °C ambient.

Applications

Automotive Interior Lighting

Industrial Sensor Signal Conditioning

Use Scenario: Driving 12 V LED strips in door courtesy lights and map lamps using PWM from microcontroller GPIO.

IC Role / Device Role / Timing Role: NPN switch controlling LED current path to ground; operates in saturated region during ON state.

Use Value: V_CEsat ≤ 450 mV limits power loss to <150 mW at 350 mA, enabling direct PCB mounting without heatsink in plastic housings.

Use Scenario: Amplifying low-level analog signals from RTD or thermistor bridges before ADC sampling.

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

Use Value: h_FE ≥ 250 ensures predictable transconductance and minimal base current error across -40 °C to +125 °C.

Power Supply Enable Switching

Microcontroller GPIO Load Interface

Use Scenario: Enabling/disabling 5 V or 3.3 V auxiliary rails in programmable logic controllers via MCU output.

IC Role / Device Role / Timing Role: High-side or low-side enable switch; used with pull-up/pull-down resistors for fail-safe default states.

Use Value: I_C = 800 mA rating supports simultaneous powering of multiple downstream ICs (e.g., op-amps, level shifters).

Use Scenario: Level-shifting and current boosting for driving optocouplers, small relays, or buzzer elements from 3.3 V MCU pins.

IC Role / Device Role / Timing Role: Digital buffer with current gain; converts weak GPIO output into robust 100–500 mA load drive capability.

Use Value: AEC-Q101 qualification ensures long-term reliability even when interfacing noisy industrial actuators.

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
BC847BH	Same SOT23 package; h_FE = 200–450 @ I_C = 10 mA (lower gain at higher current vs. BCW66GR's 250–600 @ 100 mA)	Optimized for low-current signal amplification; less suitable for >200 mA switching loads	Select when bias stability at sub-10 mA I_C is prioritized over high-current saturation performance
BC817-40	Higher P_tot = 500 mW but larger SOT23-3L footprint; h_FE = 250–630 @ I_C = 100 mA - matches BCW66GR gain but lacks AEC-Q101 qualification	Used in industrial power supplies and consumer appliances where automotive qualification is not required	Choose for cost-sensitive non-automotive designs needing identical gain and higher power margin

Compared with BC847BH and BC817-40, BCW66GR uniquely combines AEC-Q101 qualification, high h_FE at 100 mA, and low V_CEsat in a standard SOT23 - making it the preferred choice for automotive-grade switching where reliability and thermal efficiency intersect.

Availability

BCW66GR is available at Aetrix Electronics and suitable for automotive interior lighting, industrial sensor interfaces, power supply enable circuits, and microcontroller GPIO load interfacing requiring stable component supply, traceable sourcing, and lifecycle continuity.

Supply support for BCW66GR 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

Nexperia is a global semiconductor expert focused on essential system functionality components - including logic, discretes, MOSFETs, and ESD protection - with leadership in efficiency, reliability, and miniaturization.

The BCW66 series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered specifically for robust, cost-effective switching and amplification in automotive and industrial environments where thermal resilience and process consistency are mandatory.

FAQ

Is BCW66GR pin-compatible with BC847 or BC817 series?

Yes - BCW66GR uses the standard SOT23 (TO-236AB) package with identical 1-2-3 pinout (B-E-C), matching BC847, BC817, and MMBT3904 footprints. No PCB redesign is needed for drop-in substitution, though h_FE and V_CEsat differ and must be verified in circuit simulation.

What is the maximum allowable base current for BCW66GR?

The absolute maximum DC base current is 100 mA per Table 5. For reliable operation, design base drive to deliver ≤50 mA continuous or ≤200 mA pulsed (tp ≤ 1 ms), ensuring V_BEsat remains ≤1.25 V and avoiding secondary breakdown or bond wire fusing.

Does BCW66GR support 24 V automotive battery input directly?

No - its V_CEO = 45 V allows safe operation with 24 V nominal systems only if transient clamping (e.g., TVS diode) is used to suppress load dump spikes (>60 V). Direct connection without protection risks avalanche failure during ISO 7637-2 pulse 5a events.

How does thermal derating affect BCW66GR's usable current at 85 °C ambient?

At T_amb = 85 °C, P_tot derates to ~150 mW (per Figure 1), limiting I_C to ~350 mA assuming V_CEsat ≈ 350 mV. This reflects real-world constraints in enclosed automotive junction boxes and mandates thermal pad use or airflow consideration for sustained loads.

BCW66GR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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):: 5µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 160 @ 100mA, 1V

Power - Max:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BCW66GR FAQ

1.How can I place an order for BCW66GR through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW66GR 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 BCW66GR reliable?

The price and inventory of BCW66GR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW66GR is usually 5 days.

3.What payment methods are accepted for BCW66GR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW66GR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW66GR?

BCW66GR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW66GR 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 BCW66GR?

For technical support, including BCW66GR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW66GR requirements.

6.How does Aetrix verify that BCW66GR is sourced from the original manufacturer or authorized distributors?

All BCW66GR 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 BCW66GR meets industry standards.

7.What is the process for return or replacement of BCW66GR?

All BCW66GR units undergo pre-shipment inspection (PSI). If there is an issue with BCW66GR, 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 BCW66GR part is unused and in its original packaging.

Return procedure for BCW66GR:

1.Submit a request within 90 days.

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

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