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Nexperia USA Inc. BC857BW/MIF
- Part No.:
- BC857BW/MIF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857BW/MIF.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:4,986
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Product details
Overview
BC857BW/MIF from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT323 (SC-70) surface-mount 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 serves as a low-power switching or linear amplification device in compact consumer and industrial signal-path circuits.
For engineers reviewing the BC857BW/MIF datasheet, BC857BW/MIF pinout, BC857BW/MIF application, or BC857BW/MIF equivalent, key selection criteria include its PNP polarity, SOT323 footprint compatibility, guaranteed hFE range, VCEO derating versus BC856W/BC858W variants, and thermal resistance (Rth(j-a) = 625 K/W on FR4).
Technical Context
The BC857BW/MIF operates as a discrete PNP BJT with fixed emitter-base and collector-base junctions, requiring external base current control to regulate collector current flow. Its operation is defined by forward-active region parameters including hFE, VCE(sat) ≤ −600 mV at IC = −100 mA/IB = −5 mA, and VBE(sat) ≤ −850 mV under same conditions.
It adheres to IEC 60134 absolute maximum ratings: −45 V VCEO, −50 V VCBO, −5 V VEBO, 200 mW Ptot at Tamb ≤ 25 °C, and 150 °C maximum junction temperature. Thermal performance is characterized on standard FR4 PCB with single-sided 35 µm copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum allowable collector-emitter voltage with base open; defines safe blocking capability in PNP switch configurations. |
| IC | −100 mA - Continuous DC collector current rating; sets upper limit for load-driving capacity in linear or saturated operation. |
| hFE | 220–475 @ VCE = −5 V, IC = −2 mA - Confirmed DC current gain range; determines required base drive for target collector current. |
| VCE(sat) | ≤ −600 mV @ IC = −100 mA, IB = −5 mA - Saturation voltage defining conduction loss and power dissipation in switching applications. |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance on standard FR4 PCB; used to calculate temperature rise under given power dissipation. |
| fT | 100 MHz - Transition frequency indicating usable bandwidth for small-signal amplification up to RF frequencies. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration with gull-wing leads. Designed for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires external resistor biasing to establish 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 current terminal; sinks current from load toward emitter when biased on; reverse-polarity relative to NPN devices. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage PNP switching | Rated for −45 V VCEO, enabling use in 3.3 V/5 V logic-level interface and low-side load control circuits. |
| Guaranteed hFE binning | 220–475 range ensures predictable base drive requirements across production lots without design margin over-provisioning. |
| Miniature SMT package | SOT323 footprint saves board space vs. SOT23; compatible with high-density automated assembly and reflow profiles. |
| Thermal reliability | 150 °C max junction temperature and defined Rth(j-a) support stable operation in ambient temperatures up to +85 °C with proper layout. |
Applications
| LED Driver Circuit | Level-Shifting Interface |
|---|---|
Use Scenario: Driving low-current indicator LEDs from microcontroller GPIO pins with inverted logic. IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to VCC; turns ON when GPIO is pulled low. Use Value: Low VCE(sat) minimizes voltage drop and power loss; hFE ≥ 220 ensures full saturation with ≤ 0.5 mA base drive. |
Use Scenario: Translating 1.8 V logic signals to 3.3 V domain in mixed-voltage digital systems. IC Role / Device Role / Timing Role: Single-transistor level shifter using common-emitter configuration with pull-up on collector. Use Value: fT = 100 MHz supports clean edge transitions up to ~10 MHz; low Cc = 3 pF limits capacitive loading on source side. |
| Signal Amplifier Stage | Power Supply Enable Switch |
Use Scenario: Low-gain pre-amplification of sensor outputs (e.g., thermistor, photodiode) before ADC input. IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration resistor for stable DC bias and linearity. Use Value: hFE consistency enables repeatable gain calibration; low noise figure (NF = 2–10 dB) preserves signal integrity. |
Use Scenario: Enabling/disabling auxiliary 3.3 V rail in portable electronics via MCU-controlled enable line. IC Role / Device Role / Timing Role: High-side PNP pass switch placed between main supply and LDO input or load. Use Value: −45 V VCEO provides margin against supply transients; 200 mW Ptot rating accommodates brief inrush currents. |
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 electrical specs and SOT323 package; differs only in marking code (3B% vs. MIF) and tape/reel packaging variant. | No functional difference; identical use in all circuits where BC857BW/MIF is specified. | Select when standard reel packaging or alternate logistics coding is required; no redesign needed. |
| MMBT3906LT1G (onsemi) | −40 V VCEO, −200 mA IC, hFE = 100–300; SOT23 package (larger footprint, different pinout: 1=E, 2=B, 3=C). | Higher current capability but lower voltage rating and incompatible pin mapping; requires PCB layout change. | Choose only if higher IC is critical and board revision allows SOT23 footprint and pinout adaptation. |
Compared with BC857BW/MIF, BC857B,115 offers identical performance in a logistically distinct reel format, while MMBT3906LT1G trades voltage margin and pin compatibility for increased current handling-making it unsuitable for drop-in replacement without hardware modification.
Availability
BC857BW/MIF is available at Aetrix Electronics and suitable for LED driver circuits, logic-level translation, sensor signal conditioning, and power rail enable functions requiring stable component supply, consistent parametric binning, and SOT323 footprint compatibility.
Supply support for BC857BW/MIF 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 semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with global manufacturing and quality systems certified to IATF 16949 and ISO 9001.
The BC857BW/MIF belongs to Nexperia's BC856W/BC857W/BC858W family of general-purpose PNP transistors, designed for cost-sensitive, space-constrained applications in consumer, computing, and industrial electronics where predictable gain and compact SMT integration are essential.
FAQ
What is the maximum continuous collector current for BC857BW/MIF?
The BC857BW/MIF is rated for −100 mA continuous collector current (IC) at Tamb ≤ 25 °C. Derating applies above 25 °C ambient per the thermal resistance specification (Rth(j-a) = 625 K/W), and peak pulsed current is −200 mA with duty cycle constraints.
Is BC857BW/MIF pin-compatible with BC847BW?
Yes-BC857BW/MIF and BC847BW share identical SOT323 package and pinout (1=B, 2=E, 3=C), but they are complementary PNP and NPN devices. Electrical characteristics differ significantly: BC847BW is NPN with +45 V VCEO, while BC857BW/MIF is PNP with −45 V VCEO; direct substitution is not functionally valid.
Does BC857BW/MIF have automotive qualification?
No-BC857BW/MIF is not AEC-Q101 qualified. Nexperia explicitly states in its legal disclaimers that unless otherwise specified in the datasheet, products like BC857BW/MIF are non-automotive qualified and not tested to automotive reliability or temperature requirements (−40 °C to +125 °C).
What is the typical transition frequency (fT) of BC857BW/MIF?
The BC857BW/MIF has a minimum transition frequency (fT) of 100 MHz, measured at VCE = −5 V and IC = −10 mA. This value reflects its usable small-signal amplification bandwidth and supports applications such as audio pre-amplifiers and low-speed RF signal buffering.
BC857BW/MIF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC857BW/MIF FAQ
1.How can I place an order for BC857BW/MIF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BW/MIF 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 BC857BW/MIF reliable?
The price and inventory of BC857BW/MIF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BW/MIF is usually 5 days.
3.What payment methods are accepted for BC857BW/MIF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BW/MIF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BW/MIF?
BC857BW/MIF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BW/MIF 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 BC857BW/MIF?
For technical support, including BC857BW/MIF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BW/MIF requirements.
6.How does Aetrix verify that BC857BW/MIF is sourced from the original manufacturer or authorized distributors?
All BC857BW/MIF 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 BC857BW/MIF meets industry standards.
7.What is the process for return or replacement of BC857BW/MIF?
All BC857BW/MIF units undergo pre-shipment inspection (PSI). If there is an issue with BC857BW/MIF, 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 BC857BW/MIF part is unused and in its original packaging.
Return procedure for BC857BW/MIF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BW/MIF Tags
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