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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. BC857BQC-QZ

Name: BC857BQC-QZ
Brand: Nexperia USA Inc.
SKU: BC857BQC-QZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC857BQC-QZ

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: 3-XDFN Exposed Pad

Datasheet:: BC857BQC-QZ.pdf

Description:: TRANS PNP 45V 0.1A DFN1412D-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC857BQC-QZ from Nexperia is a PNP general-purpose transistor in a DFN1412D-3 (SOT8009) leadless package, rated for −45 V V_CEO, −100 mA I_C, and 220–475 h_FE at V_CE = −5 V and I_C = −2 mA. It serves as a compact, AEC-Q101-qualified switching or amplification device in space-constrained automotive and industrial PCBs.

For engineers reviewing the BC857BQC-QZ datasheet, BC857BQC-QZ pinout, BC857BQC-QZ application, or BC857BQC-QZ equivalent, this part supports AOI-compatible solder joint inspection, operates up to 150 °C junction temperature, and delivers low saturation voltage (−650 mV max at I_C = −100 mA / I_B = −5 mA) in ultra-small footprint designs.

Technical Context

This PNP bipolar junction transistor uses silicon planar epitaxial construction with side-wettable flanks for automated optical inspection. Its DC current gain range (220–475) and low V_CEsat (≤ −650 mV) enable efficient low-power switching in bias-controlled configurations.

The device is qualified per AEC-Q101 and specified for operation across −55 °C to +150 °C ambient, with thermal resistance R_th(j-a) of 278 K/W on 70 µm FR4 copper - supporting reliable thermal performance in high-density automotive modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum safe collector-emitter voltage with base open; defines off-state blocking capability in switching applications.
I_C	−100 mA - Continuous DC collector current rating; sets maximum steady-state load drive capacity.
h_FE	220–475 - DC current gain at V_CE = −5 V, I_C = −2 mA; determines required base drive for target collector current.
V_CEsat	≤ −650 mV - Collector-emitter saturation voltage at I_C = −100 mA, I_B = −5 mA; directly impacts conduction loss and power dissipation.
P_tot	450 mW - Max total power dissipation on 70 µm FR4 PCB; constrains usable current/voltage combinations under thermal limits.
T_j	150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating.
Package	DFN1412D-3 (SOT8009) - 1.4 mm × 1.2 mm × 0.48 mm leadless package with side-wettable flanks for AOI and high-density layout.

Pinout & Package

BC857BQC-QZ is housed in a 3-terminal DFN1412D-3 (SOT8009) plastic leadless package with side-wettable flanks, measuring 1.4 mm × 1.2 mm × 0.48 mm and featuring a 0.8 mm pitch. The package supports reflow soldering and automated optical inspection.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal for forward-biased PNP operation; requires negative current relative to emitter to turn on.
2	Emitter (E)	Current source terminal in PNP configuration; connected to higher potential rail in common-emitter switch layouts.
3	Collector (C)	Current sink terminal; carries load current to ground or lower-potential node when transistor is saturated.

Key Features

Feature	Design Value
AEC-Q101 qualification	Qualified for automotive applications per Stress Test Qualification for Discrete Semiconductors - ensures reliability in harsh thermal and vibration environments.
Side-wettable flanks	Enables automated optical inspection (AOI) of solder joints without X-ray - reduces post-solder defect escapes in high-volume manufacturing.
Ultra-small footprint	1.4 mm × 1.2 mm body area - saves >50% board space versus legacy SOT23 packages, critical for miniaturized ECUs and sensor modules.
Low profile	0.48 mm max height - allows stacking under shields or integration into slim-profile enclosures without mechanical interference.
High thermal power dissipation	450 mW on 70 µm FR4 - enables higher current drive than comparable micro-packages without external heatsinking.

Applications

Automotive Door Module Switching

Industrial Sensor Signal Conditioning

Use Scenario: Controlling window lift motor direction via H-bridge driver stage in door control units.

IC Role / Device Role / Timing Role: PNP switch in high-side driver configuration, enabling bidirectional current flow through motor windings.

Use Value: −45 V V_CEO withstands load-dump transients; AEC-Q101 qualification ensures functional safety compliance over vehicle lifetime.

Use Scenario: Amplifying low-level analog output from MEMS pressure sensors in factory automation nodes.

IC Role / Device Role / Timing Role: Small-signal PNP amplifier in common-emitter configuration with fixed bias network.

Use Value: 220–475 h_FE provides stable gain across temperature; low V_BE drift (−2 mV/K) maintains accuracy in unregulated supply environments.

Portable Medical Device Power Sequencing

Smart Home Actuator Interface

Use Scenario: Enabling/disabling power rails for Bluetooth LE subsystems during sleep/wake transitions in wearable monitors.

IC Role / Device Role / Timing Role: Low-leakage PNP switch controlling enable path to LDOs or DC-DC converters.

Use Value: −5 μA I_CBO at T_j = 150 °C minimizes standby current; 0.48 mm height fits within tight Z-axis constraints of wearable form factors.

Use Scenario: Driving relay coils or small solenoids in battery-powered smart locks and HVAC actuators.

IC Role / Device Role / Timing Role: General-purpose PNP switch interfacing MCU GPIO to inductive loads with flyback protection.

Use Value: −650 mV V_CEsat limits conduction loss at 100 mA; side-wettable flanks ensure solder joint integrity in consumer-grade reflow processes.

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
BC857B,115 (Nexperia)	Same die, but in SOT23 package (3.0 mm × 1.4 mm); no side-wettable flanks; R_th(j-a) = 350 K/W.	Lacks AOI support and occupies 2.5× more board area; suitable only where legacy footprint compatibility is required.	Select when upgrading existing SOT23 designs without layout revision; avoid for new AOI-dependent or space-critical designs.
MMBT3906LT1G (onsemi)	SOT23 package; −40 V V_CEO, −200 mA I_C, h_FE = 100–300; not AEC-Q101 qualified.	Higher current rating but lower voltage margin and no automotive qualification; thermal resistance ~400 K/W.	Acceptable for non-automotive industrial or consumer use where cost or availability drives selection; not recommended for automotive systems.

Compared with BC857BQC-QZ, BC857B,115 trades AOI capability and miniaturization for backward compatibility, while MMBT3906LT1G offers higher current but sacrifices voltage headroom, thermal efficiency, and automotive reliability assurance.

Availability

BC857BQC-QZ is available at Aetrix Electronics and suitable for automotive door modules, industrial sensor signal conditioning, portable medical device power sequencing, and smart home actuator interfaces requiring stable component supply, AEC-Q101 compliance, and ultra-compact packaging.

Supply support for BC857BQC-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 leading global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET devices optimized for efficiency and miniaturization.

The BC857xQC-Q series targets space-constrained automotive and industrial applications requiring AEC-Q101-qualified, AOI-compatible PNP transistors with enhanced thermal performance in sub-1.5 mm footprints.

FAQ

What is the marking code for BC857BQC-QZ?

The marking code for BC857BQC-QZ is '9G', laser-etched on the top surface of the DFN1412D-3 package. This 2-character code uniquely identifies the BC857B variant within the QC-Q series and is verified per Nexperia's standard marking specification for SOT8009 devices.

Does BC857BQC-QZ support reflow soldering, and what profile is recommended?

Yes, BC857BQC-QZ is qualified for lead-free reflow soldering per J-STD-020. Nexperia recommends using the footprint and stencil design shown in Figure 17 (0.1 mm stencil thickness, 0.4 mm solder paste aperture), with peak temperature ≤ 260 °C and time above liquidus 60–90 seconds.

How does the side-wettable flank feature improve manufacturing yield?

The side-wettable flanks on BC857BQC-QZ allow automated optical inspection systems to verify solder fillet formation on all three terminals without X-ray imaging. This eliminates blind spots inherent in bottom-terminated packages and reduces escape rate of insufficient solder joints by >90% in high-volume SMT lines.

Is BC857BQC-QZ pin-compatible with other variants in the BC857xQC-Q series?

Yes - all BC857xQC-Q series parts (A/B/C variants) share identical DFN1412D-3 (SOT8009) pinout, footprint, and thermal characteristics. Only h_FE range differs (125–250, 220–475, 420–800), allowing direct substitution where gain requirements permit without layout change.

BC857BQC-QZ Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC857xQC-Q

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:: 220 @ 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

BC857BQC-QZ FAQ

1.How can I place an order for BC857BQC-QZ through Aetrix?

Please submit a Request for Quotation (RFQ) for BC857BQC-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 BC857BQC-QZ reliable?

The price and inventory of BC857BQC-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BQC-QZ is usually 5 days.

3.What payment methods are accepted for BC857BQC-QZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BQC-QZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC857BQC-QZ?

BC857BQC-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC857BQC-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 BC857BQC-QZ?

For technical support, including BC857BQC-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BQC-QZ requirements.

6.How does Aetrix verify that BC857BQC-QZ is sourced from the original manufacturer or authorized distributors?

All BC857BQC-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 BC857BQC-QZ meets industry standards.

7.What is the process for return or replacement of BC857BQC-QZ?

All BC857BQC-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BC857BQC-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 BC857BQC-QZ part is unused and in its original packaging.

Return procedure for BC857BQC-QZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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