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Nexperia USA Inc. BCW66FR
- Part No.:
- BCW66FR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BCW66FR.pdf
- Description:
- TRANS NPN 45V 0.8A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,842
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Product details
Overview
BCW66FR from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT23 (TO-236AB) package, rated for 45 V VCEO, 800 mA continuous IC, and 250–600 hFE (depending on grade), used for low-voltage switching and linear amplification in automotive body electronics and industrial control interfaces.
For engineers reviewing the BCW66FR datasheet, BCW66FR pinout, BCW66FR application, or BCW66FR equivalent, key selection criteria include its automotive qualification, SOT23 thermal performance (Rth(j-a) = 500 K/W on FR4), DC current gain spread across F/G/H variants, and saturation voltage behavior under 100–500 mA loads.
Technical Context
This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with base-controlled collector current. Its design supports both analog amplification (VCE = 1 V, IC = 100 μA–500 mA) and digital switching (IC/IB = 10, VCE(sat) ≤ 450 mV at IC = 500 mA).
Thermal derating follows a linear 2.0 mW/°C reduction above 25 °C ambient on standard FR4 PCBs, with maximum junction temperature limited to 150 °C and storage range spanning –65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in 24 V automotive and 36 V industrial switch nodes. |
| IC | 800 mA - Continuous DC collector current rating; supports relay drivers, LED arrays, and small-signal power stages without forced cooling. |
| hFE | 250–600 @ IC = 100 mA - DC current gain range confirms stable biasing for emitter-follower or common-emitter configurations at mid-load currents. |
| VCE(sat) | ≤ 450 mV @ IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in high-duty-cycle switching applications. |
| Rth(j-a) | 500 K/W - Thermal resistance from junction to ambient on standard FR4 PCB; enables ~250 mW Ptot at Tamb = 25 °C with predictable derating. |
| fT | 100 MHz - Transition frequency confirms usable bandwidth up to ~10 MHz for small-signal amplification and fast-switching logic interface. |
Pinout & Package
SOT23 (TO-236AB) surface-mount plastic package with gull-wing leads, 1.3 mm pitch, and 2.9 mm × 1.3 mm footprint; optimized for reflow soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires 1–50 mA drive depending on load and desired saturation level. |
| 2 | Emitter (E) | Common reference terminal; tied to ground or low-side return path in most switching topologies. |
| 3 | Collector (C) | Output current sink node; connects to load (e.g., relay coil, LED string, logic gate input) and supply rail via pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and cabin applications including door modules, seat controls, and lighting drivers. |
| High hFE consistency | Graded variants (F/G/H) enable precise gain matching across production batches for analog feedback loops. |
| Low VBE(sat) | ≤1.25 V @ IC = 500 mA ensures reliable turn-on with 3.3 V or 5 V microcontroller GPIOs without external level-shifting. |
| Robust thermal margin | 150 °C max junction temperature and defined derating curve support operation in sealed enclosures up to 105 °C ambient. |
Applications
| Automotive Door Module Switching | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Driving window lift motor relays and mirror adjustment actuators in 12 V/24 V vehicle platforms. IC Role / Device Role / Timing Role: Discrete NPN switch providing galvanic isolation and current gain between MCU GPIO and inductive load. Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime; 45 V VCEO withstands load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: Amplifying low-level thermistor or RTD bridge outputs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier in emitter-follower configuration for impedance buffering and offset trimming. Use Value: Tight hFE tolerance (250–600) enables predictable gain calibration; fT = 100 MHz supports <10 kHz sensor bandwidth without phase lag. |
| Consumer Appliance Motor Control | IoT Node Power Sequencing |
Use Scenario: Controlling small DC brush motors in smart home appliances such as HVAC dampers and coffee grinders. IC Role / Device Role / Timing Role: Low-side switch interfacing MCU PWM output to motor winding with flyback diode protection. Use Value: 800 mA IC rating handles peak startup currents; VCE(sat) ≤ 450 mV limits self-heating during 50% duty cycle operation. |
Use Scenario: Enabling/disabling auxiliary rails (e.g., RF modem, sensor hub) in battery-powered edge devices using MCU-controlled sequencing. IC Role / Device Role / Timing Role: Soft-start MOSFET gate driver or direct load switch for controlled power-up/down transitions. Use Value: Fast turn-on/off (enabled by 100 MHz fT) ensures sub-millisecond rail activation; SOT23 footprint saves space in compact PCB layouts. |
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 |
|---|---|---|---|
| BC847BW | Same SOT323 package; lower IC (100 mA) and VCEO (45 V); hFE = 200–450; not AEC-Q101 qualified. | Targeted at consumer-grade signal switching only; unsuitable for automotive or industrial environments requiring stress qualification. | Select when cost and board space are critical and automotive qualification is unnecessary. |
| MMBT3904LT1G | Same SOT23 package; identical VCEO (40 V) and IC (200 mA); hFE = 100–300; AEC-Q101 qualified but lower current capability. | Limited to low-power logic interfacing and sensor biasing; cannot replace BCW66FR in >200 mA load switching. | Choose for AEC-Q101 compliance in low-current roles where BCW66FR's 800 mA headroom is excessive. |
Compared with BCW66FR, BC847BW offers smaller footprint but lacks automotive qualification and current drive, while MMBT3904LT1G matches qualification but falls short in collector current capacity-making BCW66FR the sole option for AEC-Q101-compliant, high-current SOT23 NPN switching.
Availability
BCW66FR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC analog modules, and IoT power sequencing applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for BCW66FR 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 efficiency-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.
The BCW66 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered for robust, cost-effective switching and amplification in harsh environments-including under-hood automotive systems and factory-floor industrial controllers.
FAQ
Is BCW66FR pin-compatible with BCW66F, BCW66G, and BCW66H?
Yes - all BCW66x variants share identical SOT23 (TO-236AB) pinout (1 = Base, 2 = Emitter, 3 = Collector) and mechanical footprint. The suffix denotes hFE grading only; no electrical or layout changes affect interchangeability in existing designs.
What is the maximum allowable base current for continuous operation?
The absolute maximum DC base current is 100 mA per datasheet limiting values. For reliable long-term operation, keep IB ≤ 50 mA when driving 500 mA collector loads to maintain VCE(sat) ≤ 450 mV and avoid thermal runaway at elevated ambient temperatures.
Does BCW66FR require a heatsink in typical SOT23 mounting conditions?
No - with Ptot = 250 mW at 25 °C ambient and Rth(j-a) = 500 K/W on standard FR4, junction temperature remains below 150 °C for IC ≤ 800 mA only if ambient stays ≤ 75 °C. No external heatsink is needed in properly ventilated PCB layouts.
Can BCW66FR be used in linear regulator pass-transistor applications?
Yes - its 45 V VCEO, 800 mA IC, and stable hFE support use as a series pass element in low-dropout linear regulators up to ~30 V input, provided power dissipation remains within derated Ptot limits and adequate PCB copper area is allocated for thermal spreading.
BCW66FR 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:
- 100 @ 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
BCW66FR FAQ
1.How can I place an order for BCW66FR through Aetrix?
Please submit a Request for Quotation (RFQ) for BCW66FR 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 BCW66FR reliable?
The price and inventory of BCW66FR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW66FR is usually 5 days.
3.What payment methods are accepted for BCW66FR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW66FR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCW66FR?
BCW66FR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCW66FR 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 BCW66FR?
For technical support, including BCW66FR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW66FR requirements.
6.How does Aetrix verify that BCW66FR is sourced from the original manufacturer or authorized distributors?
All BCW66FR 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 BCW66FR meets industry standards.
7.What is the process for return or replacement of BCW66FR?
All BCW66FR units undergo pre-shipment inspection (PSI). If there is an issue with BCW66FR, 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 BCW66FR part is unused and in its original packaging.
Return procedure for BCW66FR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BCW66FR Tags
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