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Nexperia USA Inc. BC857AQCZ
- Part No.:
- BC857AQCZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC857AQCZ.pdf
- Description:
- TRANS PNP 45V 0.1A DFN1412D-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,581
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Product details
Overview
BC857AQC from Nexperia is a PNP general-purpose transistor in a DFN1412D-3 (SOT8009) leadless SMD package with side-wettable flanks, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 125–250 at VCE = −5 V and IC = −2 mA. It serves as a compact, AOI-compatible switching or amplification device in space-constrained consumer and industrial PCBs.
For engineers reviewing the BC857AQC datasheet, BC857AQC pinout, BC857AQC application, or BC857AQC equivalent, this page delivers verified package dimensions, thermal derating curves, saturation voltage behavior across temperature, base-emitter voltage tracking, and validated alternatives for low-voltage PNP biasing and signal inversion tasks.
Technical Context
This transistor operates in active, saturation, and cutoff regions with defined absolute maximum ratings: −50 V VCBO, −6 V VEBO, and 360 mW Ptot on standard FR4 (35 µm Cu). Its junction-to-ambient thermal resistance is 348 K/W under free-air conditions.
The DFN1412D-3 package enables automated optical inspection via side-wettable flanks and supports reflow soldering with a recommended 0.1 mm stencil thickness. Electrical performance is characterized across −55 °C to +150 °C ambient, with VBE decreasing ~2 mV/K and hFE varying significantly with temperature and collector current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum allowable collector-emitter voltage with base open; defines safe operating range for switching loads up to 45 V in reverse polarity circuits. |
| IC | −100 mA - Continuous DC collector current rating; supports load switching or small-signal amplification in low-power analog/digital interfaces. |
| hFE | 125–250 - DC current gain at VCE = −5 V, IC = −2 mA; enables predictable base drive sizing for reliable saturation in logic-level control applications. |
| VCE(sat) | −650 mV max at IC = −100 mA, IB = −5 mA - Low saturation voltage ensures minimal power loss and heat generation when used as a saturated switch. |
| Ptot | 360 mW - Total power dissipation on FR4 PCB with 35 µm copper; determines thermal layout requirements and maximum duty-cycle operation in pulsed applications. |
| Rth(j-a) | 348 K/W - Junction-to-ambient thermal resistance in free air; informs heatsinking needs and ambient temperature derating for continuous operation. |
Pinout & Package
BC857AQC uses the DFN1412D-3 (SOT8009) ultra-small leadless plastic package: 1.4 mm × 1.2 mm × 0.48 mm body, 0.8 mm pitch, side-wettable flanks, and 0.5 mm profile - optimized for high-density routing and AOI-capable assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; connected to higher potential (e.g., VCC) in common-emitter switching layouts. |
| 3 | Collector (C) | Current sink terminal; connects to load and ground-side circuitry; polarity must respect −VCEO and −IC ratings. |
Key Features
| Feature | Design Value |
|---|---|
| Side-wettable flanks | Enables automated optical inspection (AOI) of solder joints without X-ray, improving post-reflow quality assurance in high-volume manufacturing. |
| 0.5 mm package height | Reduces board profile for ultra-thin devices such as wearables, IoT sensors, and portable medical electronics where Z-height is constrained. |
| 1.4 mm × 1.2 mm footprint | Occupies 40% less area than comparable SOT23 packages, enabling tighter trace routing and higher component density on miniaturized PCBs. |
| −45 V VCEO rating | Supports robust operation in 24 V industrial control rails and automotive subsystems with transient suppression, without requiring external clamping. |
Applications
| LED Driver Circuit | Level-Shifting Interface |
|---|---|
Use Scenario: Driving low-current indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins in battery-powered devices. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking current from LED anode to ground when base is pulled low. Use Value: −650 mV VCE(sat) minimizes voltage drop across the transistor, preserving forward voltage margin for red/green/blue LEDs at full brightness. |
Use Scenario: Translating logic signals between 5 V legacy peripherals and 3.3 V microcontrollers in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-base configuration to invert and shift voltage domains. Use Value: 125–250 hFE ensures stable DC biasing across temperature, while −6 V VEBO protects against overvoltage during hot-plug events. |
| Power Rail Enable Switch | Audio Signal Inversion Stage |
Use Scenario: Enabling/disabling auxiliary 3.3 V or 5 V power rails in portable instrumentation based on system sleep/wake states. IC Role / Device Role / Timing Role: High-side PNP switch controlling VOUT with base driven by MCU output through current-limiting resistor. Use Value: −45 V VCEO provides margin against supply transients, and 360 mW Ptot allows continuous conduction at 100 mA without heatsinking. |
Use Scenario: Inverting low-level audio signals (e.g., microphone preamp outputs) in analog front-end stages before ADC sampling. IC Role / Device Role / Timing Role: Small-signal PNP amplifier in common-emitter configuration with emitter degeneration for linearity and gain stability. Use Value: 100 MHz fT supports bandwidth up to 20 kHz with adequate phase margin, and 10 pF Ce limits high-frequency noise coupling in sensitive analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857BQC | hFE = 220–475 (vs. 125–250); otherwise identical VCEO, IC, package, and thermal specs. | Better suited for low-base-drive applications where higher gain reduces required GPIO current, but may exhibit greater gain variation across temperature. | Select when base drive capability is limited and consistent mid-range gain suffices; verify stability under worst-case hFE spread. |
| BC847AQC | NPN complement; same package, voltage/current ratings, and gain range, but opposite polarity and biasing requirements. | Used in low-side switching or NPN-based amplifier topologies; requires redesign of bias network and signal flow direction. | Choose only when circuit architecture mandates NPN topology or existing designs use BC847x series for symmetry and BOM consolidation. |
Compared with BC857BQC, BC857AQC offers lower and more tightly bounded hFE, simplifying base resistor selection for deterministic saturation; versus BC847AQC, it enables high-side switching without level-shifting circuitry but demands negative base control logic.
Availability
BC857AQC is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, power rail enable switches, and audio signal inversion stages requiring stable component supply, tight parametric consistency, and AOI-ready packaging.
Supply support for BC857AQC 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-grade and industrial MOSFETs, bipolar transistors, ESD protection, and load switches.
The BC857xQC series targets space-constrained, cost-sensitive applications needing AOI-compatible, ultra-small PNP transistors with guaranteed gain bins and robust thermal performance on standard FR4 PCBs.
FAQ
What is the maximum allowable junction temperature for BC857AQC?
The absolute maximum junction temperature (Tj) is 150 °C per the datasheet's limiting values table. Operation above this threshold risks permanent degradation of hFE, leakage currents, and bond wire integrity. Derating is required above Tamb = 25 °C using the published power derating curve - e.g., at 75 °C ambient, maximum Ptot drops to ~270 mW for the 35 µm Cu FR4 condition.
Can BC857AQC be used in linear amplification applications?
Yes, BC857AQC is characterized for linear operation with specified fT = 100 MHz, VBE vs. IC curves, and noise figure (NF = 10 dB at 1 kHz), supporting low-noise, low-distortion small-signal amplification. However, its hFE variation with temperature and current necessitates emitter degeneration or feedback for stable biasing in precision analog stages.
How does the side-wettable flank design impact solder joint inspection?
The side-wettable flanks expose solderable metal along the package edges, allowing AOI systems to capture clear top-down images of solder fillets during post-reflow inspection. This eliminates reliance on X-ray for void detection and improves defect coverage for head-in-pillow or insufficient wetting failures - critical for Class II/III reliability requirements in medical and industrial assemblies.
Is BC857AQC automotive qualified?
No, BC857AQC is not automotive qualified. The datasheet explicitly states "Non-automotive qualified products" in the legal disclaimers section and lacks AEC-Q101 stress test reporting. It is intended for industrial, consumer, and computing applications; automotive use requires explicit qualification and validation by the customer, with no warranty or liability assumed by Nexperia.
BC857AQCZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC857xQC
- Package/Case:
- 3-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 850mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 125 @ 2mA, 5V
- Power - Max:
- 360 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1412D-3
BC857AQCZ FAQ
1.How can I place an order for BC857AQCZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857AQCZ 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 BC857AQCZ reliable?
The price and inventory of BC857AQCZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857AQCZ is usually 5 days.
3.What payment methods are accepted for BC857AQCZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857AQCZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857AQCZ?
BC857AQCZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857AQCZ 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 BC857AQCZ?
For technical support, including BC857AQCZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857AQCZ requirements.
6.How does Aetrix verify that BC857AQCZ is sourced from the original manufacturer or authorized distributors?
All BC857AQCZ 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 BC857AQCZ meets industry standards.
7.What is the process for return or replacement of BC857AQCZ?
All BC857AQCZ units undergo pre-shipment inspection (PSI). If there is an issue with BC857AQCZ, 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 BC857AQCZ part is unused and in its original packaging.
Return procedure for BC857AQCZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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