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Nexperia USA Inc. BCW66HR
- Part No.:
- BCW66HR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BCW66HR.pdf
- Description:
- TRANS NPN 45V 0.8A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:21,999
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Product details
Overview
BCW66HR 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 at IC = 100 mA. It serves as a compact, thermally robust switching and linear amplification device in automotive body control modules, LED drivers, and power management stages where space-constrained PCBs require reliable discrete gain control.
For engineers reviewing the BCW66HR datasheet, BCW66HR pinout, BCW66HR application, or BCW66HR equivalent, this page delivers verified electrical specs, 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 buffering, load switching, and sensor interface design.
Technical Context
This NPN bipolar junction transistor operates with fixed-current gain bands across three variants (F/G/H); BCW66HR corresponds to the H-grade version, delivering hFE = 250–600 at VCE = 1 V, IC = 100 mA, Tamb = 25 °C (pulsed). Its 150 °C maximum junction temperature and FR4 PCB-optimized thermal resistance (Rth(j-a) = 500 K/W) support sustained operation in engine bay and cabin electronics.
The device features low VCE(sat) ≤ 450 mV at IC = 500 mA / IB = 50 mA and VBE(sat) ≤ 1.25 V under identical conditions, enabling efficient low-side switching with minimal conduction loss. Absolute maximum ratings include 50 V VCBO, 5 V VEBO, and 1 A peak ICM (tp ≤ 1 ms), aligning with ISO 16750-2 transient surge requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit for 12 V/24 V automotive switching circuits. |
| IC (continuous) | 800 mA - Continuous collector current rating at Tamb ≤ 25 °C; supports LED string drivers and relay coils without forced cooling. |
| hFE | 250–600 - DC current gain at VCE = 1 V, IC = 100 mA, pulsed; enables precise base current sizing for predictable saturation in digital logic interfaces. |
| VCE(sat) | ≤ 450 mV - Collector-emitter saturation voltage at IC = 500 mA, IB = 50 mA; limits power dissipation to < 225 mW during full conduction. |
| Ptot | 250 mW - Total power dissipation at Tamb = 25 °C on standard FR4 PCB; sets thermal design baseline before derating begins above 25 °C. |
| Rth(j-a) | 500 K/W - Junction-to-ambient thermal resistance on single-sided FR4; informs heatsink-free layout spacing and copper pour requirements. |
| AEC-Q101 | Qualified - Meets stress test requirements for discrete semiconductors in automotive applications; valid for under-hood and interior ECUs. |
Pinout & Package
BCW66HR is housed in a surface-mount SOT23 (TO-236AB) plastic package with 3 leads, optimized for reflow soldering on standard FR4 PCBs. Dimensions conform to JEDEC TO-236 outline: 2.9 mm × 1.3 mm × 1.0 mm height, with 0.95 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires ≥10 mA drive for guaranteed saturation at 500 mA load; polarity-sensitive for NPN turn-on. |
| 2 | Emitter (E) | Reference terminal tied to ground or low-side return path; carries full load current and must be routed with low-inductance trace. |
| 3 | Collector (C) | High-side output node connected to switched load (e.g., solenoid, LED anode); withstands up to 45 V transients when off. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress test standard; eliminates need for additional qualification testing in Tier-1 ECU designs. |
| High hFE grade (H) | 250–600 gain band ensures stable biasing across temperature (−55 °C to +150 °C) and production lot variation. |
| Low VCE(sat) | ≤450 mV at 500 mA enables >95% efficiency in 12 V load switches without active cooling or oversized traces. |
| SOT23 footprint compatibility | Standard 3-pin SOT23 land pattern (0.6 mm pad width, 0.5 mm pitch) allows drop-in replacement in existing layouts. |
| Thermal derating curve | Linear power reduction from 250 mW at 25 °C to 0 mW at 150 °C ambient; simplifies thermal margin calculation for sealed enclosures. |
Applications
| Automotive Door Module | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Driving window lift motor relays and mirror fold/unfold actuators in door control units. IC Role / Device Role / Timing Role: Low-side switch controlling 12 V inductive loads with flyback diode protection. Use Value: 45 V VCEO withstands load dump transients; 800 mA IC handles typical 500–700 mA relay coil currents with margin. |
Use Scenario: Amplifying analog output from pressure or temperature sensors before ADC sampling. IC Role / Device Role / Timing Role: Linear amplifier configured in common-emitter topology with emitter degeneration. Use Value: Stable hFE = 250–600 over −40 °C to +125 °C ensures consistent gain calibration across operating range. |
| LED Lighting Driver | Power Supply Enable Switch |
|
Use Scenario: PWM-controlled current sink for automotive interior LED strips (e.g., footwell, map lights). IC Role / Device Role / Timing Role: Fast-switching NPN transistor operating in saturation/cutoff at 1–10 kHz. Use Value: 100 MHz fT and low Cc = 3 pF minimize switching delay and reduce EMI during PWM edge transitions. |
Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V LDO outputs in multi-rail power management ICs. IC Role / Device Role / Timing Role: High-gain switch providing clean enable signal with minimal base drive current. Use Value: hFE ≥ 250 allows microcontroller GPIO (3.3 V, 4 mA) to reliably drive 100 mA LDO EN pin without buffer stage. |
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 |
|---|---|---|---|
| BCW66G | hFE = 160–400 at same test conditions; lower gain ceiling than BCW66HR's 250–600 band. | Less margin for high-impedance base drive or wide temperature variation; suitable where tighter gain tolerance is acceptable. | Select when cost sensitivity outweighs need for highest hFE consistency across production lots. |
| BC817-40 | Same SOT23 package but higher Ptot = 300 mW and VCEO = 45 V; hFE = 250–630 (comparable), but not AEC-Q101 qualified. | Lacks automotive qualification; requires separate reliability validation for vehicle programs. | Prefer for industrial or consumer designs where AEC-Q101 is not mandated and slightly higher power handling is beneficial. |
Compared with BCW66G, BCW66HR offers higher minimum hFE (250 vs. 160) for more deterministic base current design, while BC817-40 provides identical gain performance without automotive qualification - making BCW66HR the only option meeting OEM ECU requirements out of the box.
Availability
BCW66HR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, LED lighting control, and power supply sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BCW66HR 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 technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
BCW66HR belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered specifically for robust, cost-effective switching and amplification in harsh-environment automotive electronics.
FAQ
Is BCW66HR pin-compatible with BCW66F and BCW66G?
Yes - all BCW66 series variants (F/G/H) share identical SOT23 pinout (1 = Base, 2 = Emitter, 3 = Collector) and mechanical footprint. Electrical differences are limited to hFE grading and minor saturation voltage shifts; no PCB redesign is needed when upgrading from F/G to H grade.
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 continuous IB ≤ 50 mA - especially when driving 500 mA collector loads - to avoid thermal runaway and ensure hFE stability across temperature.
Does BCW66HR require a heatsink in typical automotive applications?
No - its 250 mW Ptot and 500 K/W Rth(j-a) allow full 800 mA conduction at ambient ≤ 50 °C on standard FR4 with minimal copper pour. Heatsinking is unnecessary unless ambient exceeds 75 °C or duty cycle exceeds 50% in sealed enclosures.
Can BCW66HR replace BCW68H in complementary pair designs?
No - BCW68H is the PNP complement (same VCEO, IC, hFE grade), not a functional substitute. They are designed for pairing in push-pull or differential configurations; using BCW66HR in place of BCW68H would invert circuit polarity and cause malfunction.
BCW66HR 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:
- 250 @ 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
BCW66HR FAQ
1.How can I place an order for BCW66HR through Aetrix?
Please submit a Request for Quotation (RFQ) for BCW66HR 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 BCW66HR reliable?
The price and inventory of BCW66HR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW66HR is usually 5 days.
3.What payment methods are accepted for BCW66HR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW66HR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCW66HR?
BCW66HR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCW66HR 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 BCW66HR?
For technical support, including BCW66HR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW66HR requirements.
6.How does Aetrix verify that BCW66HR is sourced from the original manufacturer or authorized distributors?
All BCW66HR 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 BCW66HR meets industry standards.
7.What is the process for return or replacement of BCW66HR?
All BCW66HR units undergo pre-shipment inspection (PSI). If there is an issue with BCW66HR, 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 BCW66HR part is unused and in its original packaging.
Return procedure for BCW66HR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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