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Nexperia USA Inc. BC846BW-QX
- Part No.:
- BC846BW-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC846BW-QX.pdf
- Description:
- TRANS NPN 65V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
BC846BW-Q from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT323 (SC-70) package, rated for 65 V VCEO, 100 mA IC, and DC current gain (hFE) of 200–450 at VCE = 5 V, IC = 2 mA - used in automotive signal switching and low-power amplification stages.
For engineers reviewing the BC846BW-Q datasheet, BC846BW-Q pinout, BC846BW-Q application, or BC846BW-Q equivalent, this page delivers verified electrical parameters, automotive qualification status, thermal resistance (625 K/W), SOT323 footprint details, and validated alternative transistors for design-in and BOM replacement.
Technical Context
This device operates as a silicon NPN bipolar junction transistor optimized for linear amplification and digital switching in space-constrained automotive ECUs and body-control modules. Its hFE grouping (B-grade: 200–450) ensures consistent biasing across temperature (−55 °C to +150 °C) and collector currents up to 100 mA.
Designed for reflow-soldered SMT assembly on FR4 PCBs, it features low VCE(sat) (200–400 mV at IC = 100 mA, IB = 5 mA) and tight VBE distribution (660 mV typ. at IC = 2 mA), enabling predictable base drive requirements in 5 V and 3.3 V logic interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 65 V - maximum safe collector-emitter voltage under open-base condition; supports 12 V/24 V automotive supply rails with margin. |
| IC | 100 mA continuous - suitable for driving LEDs, small relays, and logic-level interface loads without heatsinking. |
| hFE | 200–450 at VCE = 5 V, IC = 2 mA - enables stable DC biasing in amplifier stages and predictable switching thresholds. |
| VCE(sat) | 200–400 mV at IC = 100 mA, IB = 5 mA - minimizes conduction loss in saturated-switch applications. |
| Rth(j-a) | 625 K/W - thermal resistance on standard FR4 PCB; defines power derating above 25 °C ambient. |
| fT | 100 MHz - usable for audio-frequency amplification and low-speed digital signal conditioning. |
| Cc | 2–3 pF - low collector capacitance reduces high-frequency loading in RF-adjacent analog circuits. |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 1.3 mm × 1.8 mm footprint, 0.95 mm height, 3-lead single-row configuration with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires ~0.66 V forward bias and ~5 mA drive for full saturation at 100 mA collector load. |
| 2 | Emitter (E) | Current return path; internally connected to substrate; must be tied to lowest potential in common-emitter configuration. |
| 3 | Collector (C) | Output terminal; handles up to 65 V and 100 mA; thermally coupled to die via leadframe for passive dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress-test requirements including HTGB, HTRB, and ESD-HBM ≥ 2 kV - enables direct placement in engine control, lighting, and ADAS subsystems. |
| Two gain groups | BC846BW-Q's 200–450 hFE range allows tighter tolerance matching in production batches versus generic 110–450 variants. |
| SOT323 package | 0.95 mm profile and 1.3 mm × 1.8 mm footprint enable high-density routing on compact PCBs - compatible with standard SC-70 reflow footprints. |
| Low VBE variation | 660 mV typical at IC = 2 mA, ±2 mV/K tempco - simplifies bias network design across −40 °C to +125 °C operating range. |
Applications
| Automotive LED Tail Light Driver | Engine Control Unit Signal Conditioning |
|---|---|
|
Use Scenario: Switching 12 V LED strings in rear combination lamps with PWM dimming. IC Role / Device Role / Timing Role: NPN switch controlling cathode-side current path; driven by MCU GPIO with 5 mA base current. Use Value: Low VCE(sat) (≤400 mV) limits power loss to <100 mW at 100 mA, eliminating need for thermal relief pads. |
Use Scenario: Level-shifting and amplifying sensor signals (e.g., knock sensor AC output) before ADC input. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed-gain bias; configured for 20–200 kHz bandwidth. Use Value: 100 MHz fT and 2–3 pF Cc preserve signal integrity while rejecting RF coupling from ignition systems. |
| Body Control Module Relay Interface | Infotainment System Button Debounce Circuit |
|
Use Scenario: Driving 24 V, 50 mA coil relays for door lock actuators in 24 V commercial vehicles. IC Role / Device Role / Timing Role: Saturated switch with flyback diode protection; base resistor selected for IB/IC = 20. Use Value: 65 V VCEO withstands load-dump transients up to 60 V, meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Debouncing mechanical pushbuttons connected to microcontroller interrupt pins in head unit UI. IC Role / Device Role / Timing Role: Schmitt-trigger input buffer using emitter-follower + RC feedback; provides hysteresis >100 mV. Use Value: Tight hFE spread (200–450) ensures consistent threshold voltage across production units and temperature. |
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-Q | Same SOT323 package, identical AEC-Q101 qualification, but hFE = 200–450 at IC = 10 mA (not 2 mA); VCE(sat) slightly higher (max 500 mV). | Less optimal for low-current biasing (e.g., <5 mA collector loads); better suited for medium-current switching where IC ≥ 10 mA. | Select BC847BW-Q only when operating IC consistently ≥10 mA and higher VCE(sat) is acceptable. |
| MMBT3904-Q | Same 65 V/100 mA rating and SOT23 package (not SOT323); hFE = 100–300; Rth(j-a) = 400 K/W (lower thermal resistance). | Larger SOT23 footprint (2.9 mm × 1.3 mm vs. 1.8 mm × 1.3 mm); incompatible with SC-70 land patterns. | Choose MMBT3904-Q only if board layout allows SOT23 and thermal performance outweighs size constraints. |
Compared with BC846BW-Q, BC847BW-Q shifts gain test condition to higher current (10 mA), reducing low-IC predictability, while MMBT3904-Q trades miniaturization for better thermal handling - making BC846BW-Q optimal for space-limited automotive SMT designs requiring precise low-current gain.
Availability
BC846BW-Q is available at Aetrix Electronics and suitable for automotive LED drivers, engine control signal conditioning, and body control module relay interfaces requiring stable component supply and AEC-Q101 compliance.
Supply support for BC846BW-Q 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BC846xW-Q series belongs to Nexperia's AEC-Q101-qualified discrete portfolio, engineered specifically for robust operation in automotive environments - emphasizing reliability, thermal stability, and consistent parametric performance across temperature and lifetime.
FAQ
Is BC846BW-Q pin-compatible with BC846B?
No - BC846BW-Q uses SOT323 (SC-70) packaging with 1.3 mm × 1.8 mm footprint and gull-wing leads, whereas standard BC846B typically uses SOT23. Physical dimensions, solder pad layout, and thermal characteristics differ significantly; direct substitution requires PCB redesign.
What is the maximum allowable pulsed collector current for BC846BW-Q?
The peak collector current is 200 mA for single pulses ≤1 ms (duty cycle ≤0.02), as specified in Table 6. This rating assumes Tj remains within 150 °C and is validated under IEC 60134 absolute maximum conditions - not recommended for repetitive operation.
Does BC846BW-Q support wave soldering?
Yes - Nexperia provides dedicated wave soldering footprint data (Fig. 12) for SOT323, specifying 3.65 mm × 2.1 mm solder land area and preferred transport direction. Thermal profile must limit peak temperature to ≤260 °C for ≤5 s to avoid package damage or bond wire failure.
How does the 200–450 hFE range impact bias network design?
This B-grade hFE bin enables tighter base resistor tolerance: for IC = 10 mA, a 47 kΩ base resistor yields IB ≈ 213 µA, ensuring saturation across full hFE range (IC/IB ≤ 47). Designers can reduce resistor count and improve batch yield versus wider-bin alternatives.
BC846BW-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC846xW-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 65 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 2mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC846BW-QX FAQ
1.How can I place an order for BC846BW-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC846BW-QX 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 BC846BW-QX reliable?
The price and inventory of BC846BW-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC846BW-QX is usually 5 days.
3.What payment methods are accepted for BC846BW-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846BW-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC846BW-QX?
BC846BW-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC846BW-QX 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 BC846BW-QX?
For technical support, including BC846BW-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846BW-QX requirements.
6.How does Aetrix verify that BC846BW-QX is sourced from the original manufacturer or authorized distributors?
All BC846BW-QX 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 BC846BW-QX meets industry standards.
7.What is the process for return or replacement of BC846BW-QX?
All BC846BW-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC846BW-QX, 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 BC846BW-QX part is unused and in its original packaging.
Return procedure for BC846BW-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC846BW-QX Tags
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Nexperia USA Inc.
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