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NXP Semiconductors BC857CT,115
- Part No.:
- BC857CT,115
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- SC-75, SOT-416
- Datasheet:
-
BC857CT,115.pdf
- Description:
- TRANS PNP 45V 0.1A SC-75
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
BC857CT,115 from Nexperia is a PNP general purpose transistor in SC-75 (SOT416) package, rated for −45 V VCEO, −50 V VCBO, −100 mA IC, with hFE of 420–800 at −2 mA IC, used for low-power switching and amplification in portable battery-powered circuits.
For engineers reviewing the BC857CT,115 datasheet, BC857CT,115 pinout, BC857CT,115 application, or BC857CT,115 equivalent, key selection criteria include its PNP polarity, SOT416 footprint compatibility, guaranteed hFE range, VCEsat ≤ −400 mV at −100 mA/−5 mA drive, and thermal resistance of 833 K/W on FR4.
Technical Context
This device operates as a silicon PNP bipolar junction transistor optimized for linear amplification and saturated switching in low-voltage, low-current signal paths. Its design supports stable DC current gain across −55 °C to +150 °C ambient, with VBE = −580 to −770 mV and fT = 100 MHz at −10 mA/−5 V conditions.
It features low collector capacitance (Cc ≤ 2.5 pF) and emitter capacitance (Ce ≤ 10 pF), enabling use in moderate-frequency analog stages and digital logic interfacing where parasitic capacitance must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in PNP switch designs |
| hFE | 420–800 at −2 mA IC, −5 V VCE - ensures predictable base drive requirements for reliable saturation in low-current loads |
| VCEsat | ≤ −400 mV at −100 mA IC, −5 mA IB - minimizes conduction loss and self-heating in power-switching applications |
| Ptot | 150 mW at Tamb ≤ 25 °C - sets practical continuous power handling on standard FR4 PCB without heatsinking |
| Rth j-a | 833 K/W - indicates thermal limitation for ambient temperature derating in enclosed or high-temp environments |
| fT | 100 MHz - supports small-signal amplification up to audio and low-RF frequencies with usable gain margin |
Pinout & Package
SC-75 (SOT416) plastic surface-mounted package: 1.75 mm × 1.45 mm × 0.95 mm body, 3-lead, single-row, gull-wing terminals; designed for automated placement and reflow soldering on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input; requires current-limited drive to bias transistor into active or saturated region |
| 2 | Emiter | Common terminal for PNP configuration; connects to higher potential rail in switching topologies |
| 3 | Collector | Output terminal; sinks current when transistor is on; connected to load and ground reference |
Key Features
| Feature | Design Value |
|---|---|
| High hFE grade | Guaranteed 420–800 gain enables reduced base drive current and lower MCU GPIO loading |
| Low VCEsat | ≤ −400 mV at full 100 mA load ensures minimal voltage drop and heat generation in switching mode |
| Small-outline package | SOT416 footprint saves board space vs. SOT23 while maintaining compatibility with standard pick-and-place equipment |
| Wide temperature range | Specified operation from −65 °C to +150 °C supports industrial and automotive under-hood environments |
Applications
| Portable Power Switching | Level Translation Interface |
|---|---|
Use Scenario: Controlling LED backlight or sensor enable lines in handheld medical devices powered by 3.3 V Li-ion batteries. IC Role / Device Role / Timing Role: PNP switch providing high-side control with logic-level compatible base drive. Use Value: Low VCEsat preserves battery runtime; tight hFE distribution simplifies base resistor selection across production batches. | Use Scenario: Translating 1.8 V GPIO signals from an ultra-low-power microcontroller to drive 5 V logic inputs on legacy peripherals. IC Role / Device Role / Timing Role: Active pull-up level shifter using PNP common-emitter configuration. Use Value: Guaranteed hFE ≥ 420 ensures robust turn-on margin even at cold temperature extremes. |
| Analog Signal Amplification | Current Mirror Reference |
Use Scenario: Pre-amplifying weak sensor outputs (e.g., thermistor bridge) in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Linear amplifier stage operating in common-emitter mode with emitter degeneration. Use Value: fT = 100 MHz provides ample bandwidth for DC–10 kHz sensor signals with stable gain flatness. | Use Scenario: Building matched current sources in precision analog front-ends for ADC biasing or DAC output conditioning. IC Role / Device Role / Timing Role: One leg of a discrete PNP current mirror pair, leveraging tight hFE tolerance and low leakage (ICBO ≤ −15 nA). Use Value: Low ICBO and consistent hFE reduce mirror ratio error and improve temperature tracking between matched units. |
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 | hFE = 220–475 (lower gain band); identical package, pinout, and voltage ratings | Suitable where lower base drive sensitivity is acceptable or where tighter hFE tolerance is not required | Select BC857B,115 when cost optimization is prioritized and gain headroom above 420 is unnecessary |
| MMBT3906LT1G | hFE = 100–300 (wider min–max spread); SOT23 package (larger footprint); same VCEO/IC ratings | Requires PCB layout change; less suitable for space-constrained portable designs | Choose MMBT3906LT1G only if existing SOT23 land pattern is fixed and gain variation is tolerable |
Compared with BC857CT,115, BC857B,115 offers lower cost but reduced current gain consistency, while MMBT3906LT1G provides broader industry availability at the expense of board area and tighter hFE control-making BC857CT,115 optimal for miniaturized, gain-critical PNP switching.
Availability
BC857CT,115 is available at Aetrix Electronics and suitable for portable power switching, level translation interface, and analog signal amplification requiring stable component supply, consistent hFE performance, and SOT416 footprint reliability.
Supply support for BC857CT,115 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division.
The BC857CT,115 belongs to Nexperia's BC856T/BC857T series of PNP general purpose transistors, engineered for high-volume portable and industrial applications demanding consistent gain, low saturation voltage, and compact packaging.
FAQ
What is the maximum collector-emitter voltage rating for BC857CT,115?
The BC857CT,115 has a maximum collector-emitter voltage (VCEO) rating of −45 V under open-base conditions. This rating defines the highest reverse voltage that can be safely applied between collector and emitter while ensuring long-term reliability and avoiding avalanche breakdown in typical operating configurations.
What is the guaranteed DC current gain (hFE) range for BC857CT,115 at −2 mA collector current?
The BC857CT,115 guarantees a DC current gain (hFE) of 420 to 800 when tested at −2 mA collector current and −5 V collector-emitter voltage. This high-gain band enables precise base resistor calculation and reduces drive current burden on controlling ICs in both switching and linear applications.
Is BC857CT,115 pin-compatible with other transistors in the BC857T series?
Yes, BC857CT,115 shares identical SC-75 (SOT416) pinout and package dimensions with all BC857T variants (e.g., BC857AT, BC857BT) and BC856T series parts. Pin 1 is base, Pin 2 is emitter, and Pin 3 is collector-ensuring mechanical and electrical interchangeability within the family.
What is the thermal resistance from junction to ambient for BC857CT,115 on FR4 PCB?
The BC857CT,115 has a thermal resistance from junction to ambient (Rth j-a) of 833 K/W when mounted on a standard FR4 printed-circuit board. This value reflects natural convection cooling and guides thermal derating calculations for continuous operation at elevated ambient temperatures.
Does BC857CT,115 meet automotive qualification standards?
The BC857CT,115 is not explicitly qualified to AEC-Q101 or other automotive stress test standards per its published datasheet. It is specified for industrial and consumer applications with operating ambient temperature from −65 °C to +150 °C, but system-level automotive qualification requires additional testing and documentation beyond the BC857CT,115 product data sheet.
BC857CT,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-75, SOT-416
- 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:
- 400mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 150 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-75
BC857CT,115 FAQ
1.How can I place an order for BC857CT,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CT,115 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 BC857CT,115 reliable?
The price and inventory of BC857CT,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CT,115 is usually 5 days.
3.What payment methods are accepted for BC857CT,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CT,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CT,115?
BC857CT,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CT,115 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 BC857CT,115?
For technical support, including BC857CT,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CT,115 requirements.
6.How does Aetrix verify that BC857CT,115 is sourced from the original manufacturer or authorized distributors?
All BC857CT,115 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 BC857CT,115 meets industry standards.
7.What is the process for return or replacement of BC857CT,115?
All BC857CT,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC857CT,115, 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 BC857CT,115 part is unused and in its original packaging.
Return procedure for BC857CT,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CT,115 Tags
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