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Nexperia USA Inc. BC857CQAZ
- Part No.:
- BC857CQAZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC857CQAZ.pdf
- Description:
- TRANS PNP 45V 0.1A DFN1010D-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,625
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Product details
Overview
BC857CQAZ from Nexperia is a PNP general-purpose transistor in a leadless DFN1010D-3 (SOT1215) package, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 420–800 at −5 V VCE and −2 mA IC. It serves as a compact, AEC-Q101-qualified switching and amplification device in space-constrained mobile and automotive signal paths.
For engineers reviewing the BC857CQAZ datasheet, BC857CQAZ pinout, BC857CQAZ application, or BC857CQAZ equivalent, this page delivers verified electrical specs, thermal derating behavior, AOI-compatible packaging, and direct substitution guidance for high-reliability low-power PNP bipolar junction transistor selection.
Technical Context
This PNP BJT operates with emitter-base forward bias and collector-base reverse bias in common-emitter configuration. Its hFE range (420–800) enables precise current amplification in low-noise analog stages and robust saturation switching at IC/IB = 20.
Thermal resistance Rth(j-a) is 284 K/W on 4-layer FR4 PCBs, supporting stable operation up to +150 °C junction temperature. The −200 mV VCE(sat) at −10 mA IC and −0.5 mA IB ensures minimal conduction loss in battery-powered load control circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage under open-base conditions; defines breakdown margin in high-side switch applications. |
| IC | −100 mA - Continuous collector current rating; supports logic-level load switching and small-signal amplification without derating at Tamb ≤ 25 °C. |
| hFE | 420–800 - DC current gain at VCE = −5 V, IC = −2 mA; enables predictable base drive sizing for consistent switching thresholds. |
| VCE(sat) | −200 mV max at IC = −10 mA, IB = −0.5 mA - Low saturation voltage minimizes power dissipation in saturated-switch mode. |
| Ptot | 440 mW - Total power dissipation on 4-layer FR4 PCB; sets practical thermal limits for continuous operation in compact layouts. |
| Tj(max) | +150 °C - Maximum junction temperature; validated for automotive under-hood environments per AEC-Q101 stress testing. |
Pinout & Package
DFN1010D-3 (SOT1215) is a 3-terminal, leadless, ultra-thin surface-mount plastic package measuring 1.1 × 1.0 × 0.37 mm with visible and solderable side pads for AOI compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal for forward-biasing the emitter-base junction; requires current-limited drive to achieve target IC via hFE. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; connected to higher potential rail in high-side switch topologies. |
| 3 & 4 | Collector (C) | Common collector terminals (pins 3 and 4 are internally tied); provide low-inductance, dual-path current sink to ground or lower-potential node. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and body electronics per discrete semiconductor stress test standard. |
| 0.37 mm package height | Enables integration into ultra-thin mobile devices (e.g., smartphones, wearables) where Z-axis clearance is constrained below 0.4 mm. |
| AOI-compatible side pads | Visible solderable terminations allow automated optical inspection of solder joint integrity without X-ray, reducing post-reflow defect escape. |
| Three hFE grades | BC857AQA/BQA/CQA variants permit binning-based optimization: C-grade supports lowest base drive current in precision bias networks. |
Applications
| Automotive Body Control Module | Smartphone Power Sequencing |
|---|---|
Use Scenario: Driving LED indicators and small solenoids in door lock actuators and interior lighting circuits. IC Role / Device Role / Timing Role: PNP switch controlling 12 V loads with microcontroller GPIO-level base drive. Use Value: −45 V VCEO withstands automotive load-dump transients; AEC-Q101 qualification ensures field reliability over 15-year vehicle life. |
Use Scenario: Enabling/disabling voltage rails for camera modules and sensors during sleep/wake cycles. IC Role / Device Role / Timing Role: Low-leakage, fast-turnoff PNP pass element in discrete power-gating networks. Use Value: −15 nA ICBO at 25 °C minimizes standby current; 0.37 mm height fits beneath stacked camera assemblies. |
| Industrial Sensor Interface | USB-C Port Protection Logic |
Use Scenario: Level-shifting and current amplification for analog sensor outputs feeding ADC inputs. IC Role / Device Role / Timing Role: Linear-mode amplifier with stable hFE across −55 °C to +150 °C ambient range. Use Value: hFE maintains ≥420 from −55 °C to +150 °C, ensuring consistent gain in unheated outdoor enclosures. |
Use Scenario: Controlling gate bias of external N-channel MOSFETs in USB-C CC line protection circuits. IC Role / Device Role / Timing Role: Fast-switching PNP driver enabling sub-10 µs response to CC line fault detection signals. Use Value: fT = 100 MHz supports clean edge transitions; −900 mV VBE(sat) at −5 mA ensures full MOSFET enhancement. |
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 |
|---|---|---|---|
| BC857C, SOT323 | Same hFE (420–800) and VCEO (−45 V), but larger SOT323 package (2.1 × 1.3 × 0.95 mm) and higher Rth(j-a) (380 K/W). | Not suitable for AOI or ultra-thin designs; acceptable where board space and thermal budget allow larger footprint. | Select when legacy layout compatibility outweighs size/thermal advantages of DFN1010D-3. |
| MMBT3906LT1G | Lower hFE (100–300), same VCEO (−40 V), SOT23 package (3.0 × 1.4 × 1.1 mm), no AEC-Q101 qualification. | Lacks automotive qualification and high-gain stability; used in cost-sensitive consumer electronics only. | Choose only for non-automotive, non-critical applications where gain tolerance >200% is acceptable. |
Compared with BC857CQAZ, BC857C (SOT323) trades miniaturization and AOI support for easier hand-soldering and wider thermal margin, while MMBT3906LT1G sacrifices gain consistency and automotive compliance for broad distributor availability and lower unit cost.
Availability
BC857CQAZ is available at Aetrix Electronics and suitable for automotive body electronics, smartphone power sequencing, industrial sensor interfaces, and USB-C port protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BC857CQAZ 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, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The BC857XQA series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered specifically for space-constrained, thermally demanding automotive and portable electronics where reliability and miniaturization are co-primary design goals.
FAQ
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current (IBM) is −100 mA for single pulses ≤1 ms. For continuous DC operation, base current must be limited to ensure IC ≤ −100 mA and Ptot ≤ 440 mW on 4-layer FR4. At hFE = 420, this corresponds to IB ≤ −238 µA for IC = −100 mA - but typical design uses IB = −5 mA to guarantee saturation under worst-case hFE and temperature.
Does BC857CQAZ support reflow soldering per JEDEC J-STD-020?
Yes - BC857CQAZ is qualified for lead-free reflow soldering per JEDEC J-STD-020D. The DFN1010D-3 package supports peak temperatures up to 260 °C for ≤30 seconds. Recommended footprint matches Nexperia's sot1215_fr land pattern, with 0.4 mm solder mask defined pads and 0.3 mm solder paste stencil apertures.
How does the dual-collector pin (pins 3 & 4) affect PCB layout?
Pins 3 and 4 are electrically connected to the same internal collector node. Layout best practice is to tie both pads to the same net - typically a low-impedance ground plane or power return path - to reduce thermal resistance and improve current sharing. Separating them creates unnecessary inductance and degrades saturation performance.
Is the −6 V VEBO rating sufficient for 5 V logic interface applications?
Yes - the −6 V emitter-base voltage rating exceeds typical 5 V logic high levels by 20%, providing margin against overshoot and ESD events. When used with a 10 kΩ base resistor driven from a 3.3 V MCU GPIO, reverse VEB remains < −0.7 V, well within safe operating area even during transient coupling.
BC857CQAZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- 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:
- 400mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 280 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN1010D-3
BC857CQAZ FAQ
1.How can I place an order for BC857CQAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CQAZ 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 BC857CQAZ reliable?
The price and inventory of BC857CQAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CQAZ is usually 5 days.
3.What payment methods are accepted for BC857CQAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CQAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CQAZ?
BC857CQAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CQAZ 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 BC857CQAZ?
For technical support, including BC857CQAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CQAZ requirements.
6.How does Aetrix verify that BC857CQAZ is sourced from the original manufacturer or authorized distributors?
All BC857CQAZ 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 BC857CQAZ meets industry standards.
7.What is the process for return or replacement of BC857CQAZ?
All BC857CQAZ units undergo pre-shipment inspection (PSI). If there is an issue with BC857CQAZ, 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 BC857CQAZ part is unused and in its original packaging.
Return procedure for BC857CQAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CQAZ Tags
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