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Nexperia USA Inc. BC857AQB-QZ
- Part No.:
- BC857AQB-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC857AQB-QZ.pdf
- Description:
- TRANS PNP 45V 0.1A DFN1110D-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,279
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Product details
Overview
BC857AQB-Q from Nexperia is a PNP general-purpose transistor in a DFN1110D-3 (SOT8015) leadless package, rated for −45 V VCEO, −100 mA IC, and 125–250 hFE at −2 mA/−5 V. It serves as a compact, AEC-Q101-qualified switching or amplification device in space-constrained automotive and industrial control circuits.
For engineers reviewing the BC857AQB-Q datasheet, BC857AQB-Q pinout, BC857AQB-Q application, or BC857AQB-Q equivalent, this page delivers verified electrical parameters, thermal derating behavior, side-wettable flank solder joint compatibility, and automotive-grade reliability context - all confirmed from Nexperia's Rev. 4 product data sheet.
Technical Context
This PNP bipolar junction transistor operates with open-base collector-emitter breakdown of −45 V and emitter-base breakdown of −6 V, supporting stable biasing in low-voltage negative-rail signal conditioning. Its hFE range (125–250) and VCEsat ≤ −650 mV at −100 mA/−5 mA enables predictable saturation in digital logic-level switching.
Thermal resistance Rth(j-a) is 368 K/W on standard FR4 (35 µm Cu) and 298 K/W on enhanced FR4 (70 µm Cu), directly informing PCB layout decisions for power dissipation up to 340 mW at 25 °C ambient. The DFN1110D-3 package's 0.48 mm height and side-wettable flanks support AOI-compatible reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage with base open; defines rail tolerance in high-side switch configurations. |
| IC | −100 mA continuous: Sustained current-handling capability for load switching in sensor interfaces or LED drivers. |
| hFE | 125–250 at VCE = −5 V, IC = −2 mA: Predictable DC current gain for bias network design in linear amplifiers. |
| VCEsat | ≤ −650 mV at IC = −100 mA, IB = −5 mA: Low saturation voltage minimizes power loss in saturated-switch applications. |
| Ptot | 340 mW at Tamb ≤ 25 °C (FR4, 35 µm Cu): Absolute maximum power dissipation under standard PCB conditions. |
| Rth(j-a) | 368 K/W: Junction-to-ambient thermal resistance used to calculate temperature rise under steady-state load. |
| Package | DFN1110D-3 (SOT8015): 1.1 mm × 1.0 mm × 0.48 mm leadless package with side-wettable flanks for automated optical inspection. |
Pinout & Package
DFN1110D-3 (SOT8015) is a 3-terminal, ultra-thin, leadless plastic package with side-wettable flanks for reliable solder-joint inspection. Dimensions: 1.1 mm × 1.0 mm × 0.48 mm; pitch: 0.65 mm; body thickness: 0.48 mm.
| 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; typically connected to higher potential rail in high-side switches. |
| 3 | Collector (C) | Current sink terminal; connects to load or lower-potential node; carries full switched current when saturated. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics per stress test requirements. |
| Side-wettable flanks | Enables automated optical inspection (AOI) of solder joints without X-ray, improving manufacturing yield and traceability. |
| 0.48 mm package height | Reduces board profile in ultra-thin consumer and portable electronics where Z-axis space is constrained. |
| 0.65 mm pin pitch | Supports fine-pitch reflow assembly while maintaining robust solder joint geometry and thermal performance. |
| Low thermal resistance | 368 K/W on standard FR4 allows ≥250 mW usable power before exceeding 150 °C junction limit at 25 °C ambient. |
Applications
| Automotive Door Module Switching | Portable Sensor Signal Amplification |
|---|---|
|
Use Scenario: Driving small solenoids or relays in door lock/unlock actuation circuits within automotive body control modules. IC Role / Device Role / Timing Role: PNP high-side switch controlling 12 V loads with logic-level base drive from microcontroller GPIO. Use Value: −45 V VCEO withstands load-dump transients; AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime. |
Use Scenario: Amplifying weak analog signals from MEMS accelerometers or temperature sensors in battery-powered wearables. IC Role / Device Role / Timing Role: Small-signal PNP amplifier stage providing gain and level-shifting in low-noise front-end chains. Use Value: 10 dB noise figure at 1 kHz and stable hFE across −55 °C to +150 °C enable precision analog performance in variable environments. |
| Industrial PLC Input Buffer | Space-Constrained Power Sequencing |
|
Use Scenario: Isolating and conditioning 24 V DC field inputs in programmable logic controller (PLC) digital input cards. IC Role / Device Role / Timing Role: General-purpose PNP transistor used in optocoupler driver or voltage-level translation circuitry. Use Value: −6 V VEBO and −50 V VCBO provide margin against ESD and inductive kickback in noisy industrial settings. |
Use Scenario: Enabling controlled power-up sequencing of multiple voltage rails in compact IoT gateways or edge AI modules. IC Role / Device Role / Timing Role: PNP transistor acting as an active pull-up or enable switch in multi-rail supervisor circuits. Use Value: DFN1110D-3 footprint (1.1 mm × 1.0 mm) saves >60% board area versus SOT23, critical for dense multilayer PCBs. |
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 |
|---|---|---|---|
| BC857BQB-Q | hFE = 220–475 (vs. 125–250); otherwise identical ratings and package | Higher gain supports lower base drive current in low-power bias networks | Select when tighter hFE tolerance or reduced base current is required without changing layout. |
| BC857CQB-Q | hFE = 420–800; same VCEO, IC, package, and AEC-Q101 qualification | Enables single-transistor amplification stages in ultra-low-current sensor interfaces | Choose for highest gain-critical analog front ends where base current must be minimized below 1 µA. |
Compared with BC857BQB-Q and BC857CQB-Q, the BC857AQB-Q offers the lowest hFE band - advantageous for predictable saturation in digital switching and improved stability in feedback-controlled linear circuits where gain variation must be bounded.
Availability
BC857AQB-Q is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input conditioning, and portable sensor interface designs requiring stable component supply and AEC-Q101 compliance.
Supply support for BC857AQB-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BC857xQB-Q series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for space-constrained, thermally demanding automotive and industrial applications requiring AOI-compatible assembly.
FAQ
What is the maximum allowable junction temperature for BC857AQB-Q?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in Table 6 of the Nexperia datasheet. Operation above this temperature risks permanent degradation of hFE, leakage current, and long-term reliability - especially critical in automotive under-hood applications where ambient temperatures approach 125 °C.
Does BC857AQB-Q support automatic optical inspection (AOI) of solder joints?
Yes - its DFN1110D-3 (SOT8015) package features side-wettable flanks, enabling reliable AOI detection of solder fillet quality without requiring X-ray inspection. This is explicitly cited in Section 2 of the datasheet as a key benefit for high-yield surface-mount assembly.
How does the thermal resistance change with PCB copper thickness?
Rth(j-a) drops from 368 K/W (35 µm Cu) to 298 K/W (70 µm Cu) per Table 7. This 19% reduction directly improves thermal headroom: at 100 mA IC, junction temperature rise decreases by ~14 °C, allowing higher sustained power or extended operation in elevated ambient conditions.
Is BC857AQB-Q pin-compatible with BC847AQB-Q?
No - although both are in DFN1110D-3 packages and share identical pin 1 (B), pin 2 (E), pin 3 (C) assignments, BC847AQB-Q is an NPN complement. Swapping them without circuit redesign will invert logic polarity and cause functional failure due to opposite conduction direction and bias requirements.
BC857AQB-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:
- 125 @ 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
BC857AQB-QZ FAQ
1.How can I place an order for BC857AQB-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857AQB-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 BC857AQB-QZ reliable?
The price and inventory of BC857AQB-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857AQB-QZ is usually 5 days.
3.What payment methods are accepted for BC857AQB-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857AQB-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857AQB-QZ?
BC857AQB-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857AQB-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 BC857AQB-QZ?
For technical support, including BC857AQB-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857AQB-QZ requirements.
6.How does Aetrix verify that BC857AQB-QZ is sourced from the original manufacturer or authorized distributors?
All BC857AQB-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 BC857AQB-QZ meets industry standards.
7.What is the process for return or replacement of BC857AQB-QZ?
All BC857AQB-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BC857AQB-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 BC857AQB-QZ part is unused and in its original packaging.
Return procedure for BC857AQB-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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