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Nexperia USA Inc. BC857BMB,315
- Part No.:
- BC857BMB,315
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XFDFN
- Datasheet:
-
BC857BMB,315.pdf
- Description:
- TRANS PNP 45V 0.1A DFN1006B-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,738
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Product details
Overview
BC857BMB from Nexperia is a PNP general-purpose transistor in an ultra-small leadless SOT883B package, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 220–475 at VCE = −5 V and IC = −2 mA. It delivers low-profile switching and amplification in space-constrained mobile and automotive PCBs.
For engineers reviewing the BC857BMB datasheet, BC857BMB pinout, BC857BMB application, or BC857BMB equivalent, this device serves as a compact, AEC-Q101-qualified PNP switch with verified thermal resistance (Rth(j-a) = 500 K/W), low saturation voltage (VCE(sat) ≤ −400 mV @ IC = −100 mA), and binary-marked SOT883B footprint compatibility.
Technical Context
This discrete PNP bipolar junction transistor operates with open-base collector-emitter breakdown of −45 V and emitter-base breakdown of −5 V, supporting reliable cutoff and active-region biasing in low-voltage analog and digital interface circuits. Its hFE range (220–475) enables predictable current amplification across production lots without external gain-setting components.
The SOT883B package features 1.0 × 0.6 × 0.37 mm dimensions and three solder lands optimized for reflow-only assembly, delivering power dissipation (250 mW at Tamb ≤ 25 °C) comparable to SOT23 while reducing board area by >60%. Thermal resistance to ambient is specified at 500 K/W on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage under open-base condition, enabling use in 3.3 V/5 V rail-switching and level-shifting circuits. |
| IC | −100 mA: Continuous collector current rating, sufficient for driving LEDs, small relays, or logic-level signal inversion in portable electronics. |
| hFE | 220–475 @ VCE = −5 V, IC = −2 mA: Tight DC current gain spread ensures consistent base drive requirements across production units. |
| VCE(sat) | ≤ −400 mV @ IC = −100 mA, IB = −5 mA: Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching applications. |
| Rth(j-a) | 500 K/W: Junction-to-ambient thermal resistance on standard FR4 PCB, defining maximum allowable power dissipation at given ambient temperature. |
| Tj(max) | 150 °C: Absolute maximum junction temperature, supporting operation in under-hood automotive environments and thermally dense modules. |
| AEC-Q101 | Qualified: Meets Automotive Electronics Council stress-test requirements for discrete semiconductors, validating reliability for automotive infotainment and body control modules. |
Pinout & Package
SOT883B is a leadless, ultra-small surface-mount plastic package measuring 1.0 × 0.6 × 0.37 mm with three solderable terminals and a transparent top view. Its low profile (0.37 mm height) and tin-plated copper lands support high-density routing and automated reflow assembly only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to enable conduction. |
| 2 | Emiter | Current source terminal in PNP configuration; connected to higher potential (e.g., VCC) in common-emitter switching layouts. |
| 3 | Collector | Current sink terminal; routes load current to ground or lower-potential node when transistor is saturated or in active region. |
Key Features
| Feature | Design Value |
|---|---|
| Leadless SOT883B package | Reduces PCB footprint by >60% vs. SOT23 while maintaining comparable power handling-critical for wearable and IoT sensor nodes. |
| AEC-Q101 qualification | Validates robustness against temperature cycling, humidity, and mechanical stress for automotive-grade deployment without additional qualification effort. |
| Low VCE(sat) | Enables <100 mW conduction loss at 100 mA load, improving battery life in always-on mobile subsystems such as backlight drivers or sensor biasing. |
| Binary marking code "0100 0101" | Uniquely identifies BC857BMB variant on-device, supporting automated optical inspection (AOI) and traceability in high-volume SMT lines. |
| Reflow-only soldering | Eliminates hand-soldering risk and ensures repeatable thermal profiles, aligning with IPC-J-STD-020D moisture sensitivity and process compliance. |
Applications
| Mobile Power Switching | Automotive LED Control |
|---|---|
|
Use Scenario: Controlling backlight brightness and camera flash in smartphones and tablets using PWM-driven PNP current sinks. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter topology, turning on/off LED strings by sinking current from cathode to ground. Use Value: Ultra-small SOT883B footprint allows placement adjacent to LEDs on tight-pitch flex PCBs; low VCE(sat) reduces thermal load during 100% duty cycle operation. |
Use Scenario: Driving interior map lights and status indicators in automotive cabin modules where space and reliability are constrained. IC Role / Device Role / Timing Role: Discrete PNP switch interfacing microcontroller GPIOs to 12 V LED loads, providing level translation and current gain. Use Value: AEC-Q101 qualification ensures long-term stability across −40 °C to +125 °C ambient; 45 V VCEO accommodates load-dump transients up to 35 V. |
| Portable Audio Biasing | Industrial Sensor Interface |
|
Use Scenario: Providing stable bias current to electret microphone preamplifier stages in Bluetooth headsets and voice assistants. IC Role / Device Role / Timing Role: Active-load PNP current source in amplifier input stage, setting quiescent operating point independent of supply variation. Use Value: Tight hFE tolerance (220–475) ensures consistent bias current across temperature and unit variance; low noise figure (10 dB @ 1 kHz) preserves SNR. |
Use Scenario: Isolating and conditioning analog signals from pressure or temperature sensors in factory automation edge nodes. IC Role / Device Role / Timing Role: Signal-level PNP switch enabling/disabling sensor excitation current or multiplexing analog paths in multi-channel DAQ systems. Use Value: −5 V VEBO rating supports safe reverse-bias protection when sensor outputs float; 150 °C Tj(max) permits operation near hot industrial controllers. |
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 |
|---|---|---|---|
| BC857CMB | Higher hFE (420–800) but identical VCEO, IC, and package; same marking format with "0100 0110" code. | Better suited for low-base-drive applications like high-gain amplifiers or low-current switches where precise gain control is critical. | Select BC857CMB only if circuit requires guaranteed hFE ≥ 420 at IC = −2 mA; otherwise BC857BMB offers optimal balance of gain and cost. |
| BC847BMB | NPN complement with matching SOT883B package, same hFE range (220–475), but opposite polarity and VCEO = +45 V. | Used in complementary emitter-follower pairs or NPN-based logic inverters where sourcing (not sinking) current is required. | Choose BC847BMB only for NPN topology needs; not a drop-in replacement due to polarity reversal and different biasing requirements. |
Compared with BC857CMB, BC857BMB trades peak gain for tighter mid-range consistency and lower cost; versus BC847BMB, it provides true PNP functionality essential for high-side switching and current-sinking configurations where NPN cannot substitute.
Availability
BC857BMB is available at Aetrix Electronics and suitable for mobile power switching, automotive LED control, portable audio biasing, and industrial sensor interface applications requiring stable component supply and AEC-Q101-compliant performance.
Supply support for BC857BMB 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-grade components and advanced packaging technologies.
The BC857xMB series targets space-constrained, high-reliability applications in automotive, mobile, and industrial markets-designed specifically to replace legacy SOT23 transistors with smaller footprints and qualified stress performance.
FAQ
Is BC857BMB compatible with reflow soldering only?
Yes. The SOT883B package is qualified exclusively for reflow soldering per Nexperia's specification; wave soldering, hand soldering, or infrared methods are not recommended and may damage the device or compromise solder joint integrity due to thermal stress on the ultra-thin package structure.
What does the marking "0100 0101" indicate on BC857BMB?
This binary code uniquely identifies the BC857BMB variant within the BC857xMB family. Per Nexperia's marking documentation, "0100 0101" corresponds specifically to the B-gain bin (hFE = 220–475), distinguishing it from AMB (0100 0100) and CMB (0100 0110) variants on the same SOT883B substrate.
Can BC857BMB replace BC857B in SOT23 packages?
No. While electrically similar, BC857BMB uses the leadless SOT883B package (1.0 × 0.6 mm), whereas BC857B uses SOT23 (3.0 × 1.4 mm). Footprint, solder land geometry, and thermal behavior differ significantly-direct PCB replacement requires layout redesign and requalification of thermal performance and solder joint reliability.
Does BC857BMB support operation above 100 mA continuous current?
No. Its absolute maximum continuous collector current is −100 mA at Tamb ≤ 25 °C. At higher currents or elevated ambient temperatures, power dissipation exceeds the 250 mW limit, risking thermal runaway. For >100 mA loads, derating curves in the datasheet must be applied, or a higher-rated device selected.
BC857BMB,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 3-XFDFN
- 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:
- 150 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN1006B-3
BC857BMB,315 FAQ
1.How can I place an order for BC857BMB,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BMB,315 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 BC857BMB,315 reliable?
The price and inventory of BC857BMB,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BMB,315 is usually 5 days.
3.What payment methods are accepted for BC857BMB,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BMB,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BMB,315?
BC857BMB,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BMB,315 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 BC857BMB,315?
For technical support, including BC857BMB,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BMB,315 requirements.
6.How does Aetrix verify that BC857BMB,315 is sourced from the original manufacturer or authorized distributors?
All BC857BMB,315 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 BC857BMB,315 meets industry standards.
7.What is the process for return or replacement of BC857BMB,315?
All BC857BMB,315 units undergo pre-shipment inspection (PSI). If there is an issue with BC857BMB,315, 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 BC857BMB,315 part is unused and in its original packaging.
Return procedure for BC857BMB,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BMB,315 Tags
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