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

Nexperia USA Inc. BC857BQAZ

Name: BC857BQAZ
Brand: Nexperia USA Inc.
SKU: BC857BQAZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC857BQAZ

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: 3-XDFN Exposed Pad

Datasheet:: BC857BQAZ.pdf

Description:: TRANS PNP 45V 0.1A DFN1010D-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC857BQAZ from Nexperia is a PNP general-purpose transistor in a leadless DFN1010D-3 (SOT1215) package, rated for −45 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 220–475 at −5 V V_CE and −2 mA I_C. It serves as a compact, AEC-Q101-qualified switching and amplification device in space-constrained mobile and automotive signal paths.

For engineers reviewing the BC857BQAZ datasheet, BC857BQAZ pinout, BC857BQAZ application, or BC857BQAZ equivalent, this part supports high-density PCB layouts requiring low-profile (<0.37 mm), AOI-compatible discrete transistors with verified automotive-grade reliability and defined saturation voltage behavior under −10 mA/−0.5 mA drive conditions.

Technical Context

This PNP bipolar junction transistor operates with open-base collector-emitter breakdown of −45 V and emitter-base breakdown of −6 V, enabling robust biasing in negative-rail interface circuits. Its h_FE range (220–475) provides predictable current amplification across production lots without external trimming.

V_CEsat is specified at −200 mV (I_C = −10 mA, I_B = −0.5 mA) and −400 mV (I_C = −100 mA, I_B = −5 mA), confirming low-loss switching capability in battery-powered load control. Thermal resistance R_th(j-a) is 284 K/W on 4-layer FR4, supporting continuous operation up to +150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum safe collector-emitter voltage with base open; defines rail compatibility in negative-supply logic interfaces.
I_C	−100 mA - Continuous collector current rating; sets maximum load drive capacity in discrete switch stages.
h_FE	220–475 - DC current gain at −5 V V_CE, −2 mA I_C; enables stable bias network design with ±20% gain tolerance.
V_CEsat	−200 mV @ −10 mA/−0.5 mA - Low saturation voltage ensures <200 mW power loss per switch event in portable power management.
Package	DFN1010D-3 (SOT1215) - 1.1 × 1.0 × 0.37 mm ultra-thin leadless package; supports automated optical inspection and 0.4 mm pitch routing.
AEC-Q101	Qualified - Validated for automotive applications per stress test standard; confirms reliability under thermal cycling and humidity exposure.

Pinout & Package

DFN1010D-3 (SOT1215) is a 3-terminal, leadless surface-mount package with visible and solderable side pads, body dimensions 1.1 mm × 1.0 mm × 0.37 mm, and thermal-enhanced copper pad layout for efficient heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input for forward-active and saturation bias; requires current-limited drive to maintain h_FE-based gain stability.
2	Emitter	Common reference terminal for PNP configuration; connects to higher-potential rail in high-side switch topologies.
3 & 4	Collector	Dual-pad collector connection improves current handling and thermal conduction; both pads must be routed to same net.

Key Features

Feature	Design Value
Low profile height	0.37 mm - Enables stacking under shields or integration into ultra-thin mobile modules without mechanical interference.
AOI-compatible side pads	Visible solderable terminals - Allows automated optical inspection of solder joint integrity without X-ray, reducing post-reflow QA cost.
Three h_FE grades	BC857AQA/BQA/CQA selection - Permits precise gain binning for analog amplification or digital switching without circuit redesign.
Thermal performance	284 K/W R_th(j-a) on 4-layer FR4 - Supports >200 mW continuous dissipation in thermally constrained automotive ECUs.

Applications

Automotive Door Module

Smartphone Power Sequencing

Use Scenario: Controlling window motor enable/disable signals in door control units with CAN-linked microcontrollers.

IC Role / Device Role / Timing Role: PNP switch isolating 12 V supply from MCU GPIO; handles transient load currents up to 100 mA during motor stall.

Use Value: AEC-Q101 qualification ensures operational stability across −40 °C to +125 °C ambient, while low V_CEsat minimizes self-heating during repeated actuation cycles.

Use Scenario: Enabling/disabling PMIC rails during boot-up and sleep transitions in LTE-enabled handsets.

IC Role / Device Role / Timing Role: High-side load switch for 3.3 V I/O domain; driven by AP GPIO with 0.5 mA base current.

Use Value: 0.37 mm package height allows placement beneath camera modules; dual collector pads reduce trace inductance for clean power rail turn-on.

USB-C Port Protection

Industrial Sensor Interface

Use Scenario: Reverse-voltage blocking for VBUS path in USB-C receptacles with overvoltage clamping diodes.

IC Role / Device Role / Timing Role: PNP-based active clamp preventing backfeed from downstream devices during hot-plug events.

Use Value: −45 V V_CEO withstands 2× VBUS transients; −6 V V_EBO ensures reliable emitter-base reverse blocking during fault conditions.

Use Scenario: Level-shifting analog sensor outputs (e.g., thermistor bridges) to 5 V ADC inputs in programmable logic controllers.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-impedance drive without loading sensitive resistive dividers.

Use Value: h_FE ≥220 guarantees ≤1% gain error across temperature; low noise figure (10 dB) preserves signal SNR in 200 μA bias conditions.

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
BC857BW,115	Same die, SOT323 package (1.7 × 1.3 × 0.95 mm); higher R_th(j-a) (350 K/W); no AOI side pads.	Less suitable for ultra-thin or AOI-dependent designs; acceptable where board space permits larger footprint.	Select when legacy SOT323 layout reuse is required and thermal margin exceeds 200 mW.
MMBT3906LT1G	SOT23 package (3.0 × 1.4 × 1.1 mm); h_FE 100–300; not AEC-Q101 qualified; V_CEO = −40 V.	Lacks automotive qualification and tighter h_FE binning; lower voltage rating limits use in 12 V+ systems.	Choose only for non-automotive consumer applications where cost outweighs reliability and precision requirements.

Compared with BC857BW,115 and MMBT3906LT1G, BC857BQAZ delivers superior thermal performance in minimal volume, guaranteed AOI visibility, and automotive-grade validation-making it the optimal choice for next-generation compact, safety-aware electronics where package size, inspection yield, and qualification rigor are non-negotiable.

Availability

BC857BQAZ is available at Aetrix Electronics and suitable for automotive door modules, smartphone power sequencing, USB-C port protection, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for BC857BQAZ 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, high-reliability switching and amplification in automotive and portable electronics.

FAQ

What is the maximum allowable junction temperature for BC857BQAZ?

The absolute maximum junction temperature (T_j) is +150 °C, as defined in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent parametric shift or failure. Derating begins at +25 °C ambient, with total power dissipation dropping linearly to zero at +150 °C junction temperature per the published derating curve.

Does BC857BQAZ support reflow soldering per JEDEC J-STD-020?

Yes-BC857BQAZ is qualified for lead-free reflow soldering per JEDEC J-STD-020D. The DFN1010D-3 package uses standard SnAgCu paste and follows the recommended peak temperature profile of 260 °C for ≤30 seconds, with preheat ramp rates and soak durations aligned to the Nexperia SOT1215 footprint guidelines.

How does the dual-collector pin configuration affect PCB layout?

Pins 3 and 4 are internally connected to the same collector node and must be routed to identical net potentials. Both pads require equal solder mask openings and thermal relief patterns to ensure balanced current sharing and uniform thermal expansion. Splitting or isolating these pads invalidates thermal and electrical specifications.

Is BC857BQAZ pin-compatible with BC847BQA?

No-BC857BQAZ is a PNP transistor in DFN1010D-3 (SOT1215) with pin 1=Base, 2=Emitter, 3&4=Collector. BC847BQA is its NPN complement in the same package but with reversed polarity and identical pinout numbering; direct substitution would invert logic states and violate bias requirements.

BC857BQAZ 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:: 220 @ 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

BC857BQAZ FAQ

1.How can I place an order for BC857BQAZ through Aetrix?

Please submit a Request for Quotation (RFQ) for BC857BQAZ 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 BC857BQAZ reliable?

The price and inventory of BC857BQAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BQAZ is usually 5 days.

3.What payment methods are accepted for BC857BQAZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BQAZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC857BQAZ?

BC857BQAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC857BQAZ 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 BC857BQAZ?

For technical support, including BC857BQAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BQAZ requirements.

6.How does Aetrix verify that BC857BQAZ is sourced from the original manufacturer or authorized distributors?

All BC857BQAZ 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 BC857BQAZ meets industry standards.

7.What is the process for return or replacement of BC857BQAZ?

All BC857BQAZ units undergo pre-shipment inspection (PSI). If there is an issue with BC857BQAZ, 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 BC857BQAZ part is unused and in its original packaging.

Return procedure for BC857BQAZ:

1.Submit a request within 90 days.

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

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