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Nexperia USA Inc. BC857CQB-QZ
- Part No.:
- BC857CQB-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC857CQB-QZ.pdf
- Description:
- TRANS PNP 45V 0.1A DFN1110D-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,123
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Product details
Overview
BC857CQB-QZ from Nexperia is a PNP general-purpose transistor in a DFN1110D-3 (SOT8015) leadless SMD package with side-wettable flanks, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 420–800 at VCE = −5 V and IC = −2 mA. It supports automotive-grade switching and amplification in space-constrained PCB layouts.
For engineers reviewing the BC857CQB-QZ datasheet, BC857CQB-QZ pinout, BC857CQB-QZ application, or BC857CQB-QZ equivalent, this device is selected for high-density, AOI-compatible automotive signal conditioning, low-voltage biasing, and discrete logic-level inversion where thermal performance and AEC-Q101 qualification are required.
Technical Context
This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with verified VCE(sat) ≤ −650 mV at IC = −100 mA / IB = −5 mA and VBE(sat) ≤ −850 mV under identical conditions. Its fT of 100 MHz enables stable small-signal amplification up to mid-VHF range.
Thermal resistance Rth(j-a) is 298 K/W on 70 µm FR4 copper, supporting continuous operation up to Tj = 150 °C. The DFN1110D-3 package's 0.48 mm height and 1.1 mm × 1.0 mm footprint enable placement beneath connectors or near fine-pitch ICs without interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage before breakdown in open-base configuration |
| IC | −100 mA - Continuous DC collector current rating defining maximum linear load drive capability |
| hFE | 420–800 - DC current gain at VCE = −5 V, IC = −2 mA, enabling precise base-current sizing for low-power switching |
| VCE(sat) | ≤ −650 mV - Saturation voltage at IC = −100 mA / IB = −5 mA, minimizing conduction loss in switch mode |
| fT | 100 MHz - Transition frequency confirming usable bandwidth for audio and digital signal buffering |
| Rth(j-a) | 298 K/W - Junction-to-ambient thermal resistance on standard 70 µm FR4 PCB, guiding heatsinking requirements |
| AEC-Q101 | Qualified - Certified for automotive applications per stress test standard, ensuring reliability in harsh environments |
Pinout & Package
DFN1110D-3 (SOT8015) is a 3-terminal, ultra-thin (0.48 mm), leadless plastic package with side-wettable flanks for automated optical inspection (AOI) of solder joints. Dimensions: 1.1 mm × 1.0 mm × 0.48 mm; pitch: 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires external resistor biasing to set operating point in active or saturation region |
| 2 | Emitter (E) | Common terminal for PNP topology; connected to higher potential rail in typical common-emitter switch configuration |
| 3 | Collector (C) | Output terminal sourcing current toward load; polarity must be reversed vs. NPN for correct biasing |
Key Features
| Feature | Design Value |
|---|---|
| Side-wettable flanks | Enables reliable AOI-based solder joint inspection on automated assembly lines without X-ray |
| 0.48 mm package height | Reduces vertical stack-up in ultra-thin modules such as automotive sensors and wearables |
| 340–420 mW power dissipation | Supports sustained operation at full rated current on standard FR4 PCBs without forced cooling |
| AEC-Q101 qualification | Validates robustness against temperature cycling, humidity, and mechanical shock per automotive standards |
| Low Cc (2 pF) and Ce (10 pF) | Minimizes capacitive loading in high-speed switching nodes and RF-coupled bias networks |
Applications
| Automotive Door Module Switching | Portable Medical Sensor Biasing |
|---|---|
|
Use Scenario: Controlling LED status indicators and small solenoid latches in door control units exposed to −40 °C to +105 °C ambient. IC Role / Device Role / Timing Role: PNP switch sinking current from 12 V rail to ground-controlled loads, replacing larger SOT23 devices. Use Value: Side-wettable flanks ensure post-reflow AOI pass rate >99.9%; AEC-Q101 qualification eliminates field return risk. |
Use Scenario: Providing precision bias current to op-amp input stages and transimpedance amplifiers in battery-powered ECG front-ends. IC Role / Device Role / Timing Role: Active-load current source with stable hFE across temperature, improving DC offset stability. Use Value: Low VCE(sat) (<650 mV) preserves headroom in 3.3 V systems; 0.48 mm height avoids interference with flex PCB folding. |
| Industrial PLC Input Conditioning | Consumer Audio Signal Inversion |
|
Use Scenario: Level-shifting and isolating 24 V industrial sensor signals into 3.3 V microcontroller GPIO inputs. IC Role / Device Role / Timing Role: Common-emitter inverter with hFE ≥420 ensuring minimal base drive burden on upstream optocoupler outputs. Use Value: −45 V VCEO withstands induced transients; qualified thermal derating supports 50 °C+ cabinet operation. |
Use Scenario: Inverting line-level audio signals between DAC output and headphone amplifier input in compact Bluetooth speakers. IC Role / Device Role / Timing Role: Low-noise (NF = 10 dB) PNP emitter-follower buffer preserving signal integrity below 20 kHz. Use Value: 100 MHz fT ensures flat gain response; low Ce (10 pF) prevents high-frequency roll-off in feedback 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 |
|---|---|---|---|
| BC857CQB | Same die, identical electrical specs, but unmarked (no A7 top-side marking) | No functional difference; used where traceability or visual verification not required | Select when cost sensitivity outweighs need for lot-level identification |
| BC857BW,115 | SOT323 package (larger 2.1 mm × 1.25 mm), no side-wettable flanks, same hFE range | Lacks AOI support; unsuitable for high-reliability automotive reflow lines requiring solder-joint inspection | Choose only for legacy designs with SOT323 footprints and non-AEC production environments |
Compared with BC857CQB-QZ, BC857CQB offers identical performance at lower traceability assurance, while BC857BW,115 sacrifices AOI compatibility and board area efficiency for broader distributor availability in legacy packages.
Availability
BC857CQB-QZ is available at Aetrix Electronics and suitable for automotive body electronics, portable medical instrumentation, industrial PLC I/O modules, and consumer audio subsystems requiring stable component supply with AEC-Q101 compliance and ultra-compact packaging.
Supply support for BC857CQB-QZ 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, mobile, and computing markets.
The BC857xQB-Q series targets space-constrained, high-reliability applications requiring AEC-Q101-qualified discretes with advanced packaging-designed specifically for next-generation automotive ECUs and miniaturized industrial controls.
FAQ
What is the maximum allowable junction temperature for BC857CQB-QZ?
The absolute maximum junction temperature (Tj) is 150 °C, validated per IEC 60134 limiting values. Operation above this threshold risks permanent degradation of hFE and increased leakage. Derating curves in Figure 1 confirm 420 mW total power dissipation is valid only at Tamb ≤ 25 °C on 70 µm FR4; thermal design must maintain Tj < 150 °C under worst-case ambient and load conditions.
Does BC857CQB-QZ support reflow soldering with standard lead-free profiles?
Yes-Nexperia specifies compatibility with IPC/JEDEC J-STD-020D-compliant lead-free reflow profiles. The DFN1110D-3 package uses matte tin terminations and is qualified for peak temperatures up to 260 °C. Figure 17 provides exact stencil thickness (0.1 mm), land pattern, and solder paste volume recommendations to ensure void-free side-wettable flank wetting.
How does the hFE variation across temperature affect circuit design?
hFE decreases by ~0.5%/°C above 25 °C and increases below it, as shown in Figure 12. At −55 °C, hFE drops to ~60% of room-temperature value; at 150 °C, it falls to ~40%. Designers must size base resistors using worst-case hFE (420 min) at max operating Tj to guarantee saturation under all conditions.
Can BC857CQB-QZ replace BC857C in existing SOT23 designs?
No-BC857CQB-QZ uses DFN1110D-3 (SOT8015), which is physically incompatible with SOT23 footprints. Pin 1 (base) location differs, and the leadless construction requires redesigned PCB pads, stencil apertures, and AOI setup. Electrical equivalence does not imply mechanical interchangeability; migration requires layout revision and requalification.
BC857CQB-QZ 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:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 340 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1110D-3
BC857CQB-QZ FAQ
1.How can I place an order for BC857CQB-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CQB-QZ 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 BC857CQB-QZ reliable?
The price and inventory of BC857CQB-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CQB-QZ is usually 5 days.
3.What payment methods are accepted for BC857CQB-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CQB-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CQB-QZ?
BC857CQB-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CQB-QZ 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 BC857CQB-QZ?
For technical support, including BC857CQB-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CQB-QZ requirements.
6.How does Aetrix verify that BC857CQB-QZ is sourced from the original manufacturer or authorized distributors?
All BC857CQB-QZ 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 BC857CQB-QZ meets industry standards.
7.What is the process for return or replacement of BC857CQB-QZ?
All BC857CQB-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BC857CQB-QZ, 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 BC857CQB-QZ part is unused and in its original packaging.
Return procedure for BC857CQB-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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