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onsemi BC857BTT1
- Part No.:
- BC857BTT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- SC-75, SOT-416
- Datasheet:
-
BC857BTT1.pdf
- Description:
- TRANS PNP 45V 0.1A SC75 SOT416
- Quantity:
- Payment:
- Shipping:
Inventory:7,408
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Product details
Overview
BC857BTT1 from onsemi is a PNP silicon general-purpose amplifier transistor in SOT-416 (SC-75) package, rated for −45 V VCEO, −100 mA continuous collector current, and 100 MHz fT. It delivers DC current gain (hFE) of 220–475 at −2 mA/−5 V and supports automotive-grade reliability per AEC-Q101.
For engineers reviewing the BC857BTT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, low-power SOT-416 footprint, −5.0 V VEBO rating, thermal resistance of 400 °C/W (with 1.0 × 1.0 in pad), and NSV-prefix qualification for PPAP-capable automotive systems.
Technical Context
This PNP bipolar junction transistor operates in linear amplification and switching modes with verified saturation performance: VCE(sat) = −0.3 V at −10 mA/−0.5 mA and −0.65 V at −100 mA/−5.0 mA. Its output capacitance (Cob) is 4.5 pF at −10 V, and noise figure is 10 dB at 1 kHz with 2 kΩ source resistance.
The device features two distinct thermal dissipation ratings: 200 mW (min pad) and 300 mW (1.0 × 1.0 in pad), with corresponding RJA values of 600 °C/W and 400 °C/W. Junction temperature range spans −55 °C to +150 °C, supporting operation in harsh ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage before breakdown under normal bias conditions |
| IC (cont.) | −100 mA - Continuous DC collector current limit defining steady-state power handling capability |
| hFE | 220–475 - DC current gain range at −2 mA/−5 V, critical for bias stability in amplifier stages |
| fT | 100 MHz - Unity-gain bandwidth confirming suitability for audio and low-RF signal amplification |
| Cob | 4.5 pF - Output capacitance at −10 V reverse bias, directly affecting high-frequency roll-off and stability |
| RJA (1.0×1.0 in) | 400 °C/W - Junction-to-ambient thermal resistance with standard FR-4 pad, enabling 300 mW dissipation at 25 °C |
Pinout & Package
SOT-416 (SC-75) surface-mount package: 1.60 mm × 0.80 mm × 0.80 mm body, 1.00 mm pitch, 3-terminal configuration with gull-wing leads. RoHS-compliant, Pb-free, marked "3F" with date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control electrode for forward-active and saturation biasing; requires current-limited drive for reliable switching |
| 2 | Emitter | Current source terminal in PNP configuration; connected to higher potential rail in common-emitter circuits |
| 3 | Collector | Current sink terminal; carries full load current and must be routed with adequate copper area for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| NSV prefix | Indicates dedicated manufacturing site and enhanced process controls required for PPAP submission |
| VEBO = −5.0 V | Enables safe operation with emitter-base reverse bias up to 5 V, critical for level-shifting and protection circuits |
| VCE(sat) ≤ −0.65 V | Minimizes conduction loss in saturated-switch applications such as LED drivers and logic-level translators |
| Low Cob (4.5 pF) | Reduces Miller effect and improves high-frequency response in RF preamplifier and oscillator buffer stages |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Level-shifting and interface buffering between 3.3 V microcontrollers and 12 V vehicle bus signals. IC Role / Device Role / Timing Role: PNP switch providing active-low open-collector emulation with fast turn-off via base pull-up. Use Value: −45 V VCEO withstands load-dump transients; AEC-Q101 qualification ensures long-term reliability in under-hood environments. |
Use Scenario: Amplifying low-level analog outputs from RTD or thermistor bridges in programmable logic controllers. IC Role / Device Role / Timing Role: Linear amplifier stage with hFE ≥ 220 ensuring stable gain across temperature (−40 °C to +125 °C). Use Value: 10 dB noise figure at 1 kHz enables accurate sub-mV signal resolution without added filtering complexity. |
| Consumer Audio Preamp Stage | Medical Patient Monitor Front-End |
Use Scenario: Low-noise voltage amplification in battery-powered headphone drivers and portable audio codecs. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier biased at −2 mA for optimal linearity and fT utilization. Use Value: 100 MHz fT supports full audio bandwidth (20 Hz–20 kHz) with margin; SOT-416 footprint saves PCB space in compact designs. |
Use Scenario: Isolating and amplifying ECG electrode signals while rejecting common-mode interference. IC Role / Device Role / Timing Role: Input-stage PNP transistor in instrumentation amplifier topology, leveraging matched hFE and low Cob. Use Value: −5.0 V VEBO allows safe reverse-bias during ESD events; 400 °C/W RJA supports continuous operation within medical thermal limits. |
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 |
|---|---|---|---|
| BC857CTT1G | Higher hFE range (420–800), identical VCEO, VEBO, and package | Better suited for high-gain linear amplifiers where bias stability at low IC is critical | Select BC857CTT1G when gain > 420 is required; BC857BTT1 remains optimal for moderate-gain, cost-sensitive switching |
| MMBT857 | Same electrical specs but non-automotive grade; no NSV prefix or AEC-Q101 qualification | Limited to commercial/industrial use; not approved for automotive production programs | Choose MMBT857 only for non-automotive prototypes or cost-driven consumer designs without PPAP requirements |
Compared with BC857CTT1G and MMBT857, the BC857BTT1 provides balanced hFE (220–475), AEC-Q101 compliance, and NSV traceability-making it the preferred choice for production automotive modules requiring validated process control and thermal robustness.
Availability
BC857BTT1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and portable audio signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for BC857BTT1 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BC857BTT1 belongs to onsemi's general-purpose bipolar transistor family designed specifically for cost-effective, high-reliability amplification and switching in space-constrained, thermally demanding environments.
FAQ
What is the maximum operating temperature for BC857BTT1?
The BC857BTT1 has a specified junction and storage temperature range of −55 °C to +150 °C. This allows operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating of power dissipation above 25 °C is required per the 2.4 mW/°C thermal derating curve for the 1.0 × 1.0 in pad layout.
Is BC857BTT1 pin-compatible with BC847 series NPN transistors?
No, BC857BTT1 is a PNP transistor with Base–Emitter–Collector pinout (1–2–3), whereas BC847-series NPN devices have Collector–Base–Emitter orientation in the same SOT-416 package. Swapping them without circuit redesign will cause functional failure. Always verify pin mapping using the official onsemi marking diagram for BC857BTT1.
Does BC857BTT1 meet RoHS and REACH requirements?
Yes, BC857BTT1 is a Pb-free device compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The "G" suffix and "microdot" marking indicate lead-free termination, and the device uses matte tin plating on gull-wing leads per onsemi's qualified material specifications.
What does the "NSV" prefix in NSVBC857BTT1G* signify?
The "NSV" prefix in NSVBC857BTT1G* identifies a dedicated manufacturing site and process flow meeting automotive-specific change control, traceability, and quality system requirements. It confirms PPAP capability and AEC-Q101 qualification-essential for Tier 1 automotive suppliers validating components for production release.
Can BC857BTT1 be used in linear regulator pass transistor applications?
BC857BTT1 is not recommended as a pass transistor in linear regulators due to its limited power dissipation (max 300 mW with 1.0 × 1.0 in pad) and lack of built-in thermal shutdown. Its design intent is general-purpose amplification and low-current switching-not sustained high-power regulation. Use dedicated LDOs or higher-rated PNP transistors like MJD2955 for such roles.
BC857BTT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 650mV @ 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-75, SOT-416
BC857BTT1 FAQ
1.How can I place an order for BC857BTT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BTT1 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 BC857BTT1 reliable?
The price and inventory of BC857BTT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BTT1 is usually 5 days.
3.What payment methods are accepted for BC857BTT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BTT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BTT1?
BC857BTT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BTT1 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 BC857BTT1?
For technical support, including BC857BTT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BTT1 requirements.
6.How does Aetrix verify that BC857BTT1 is sourced from the original manufacturer or authorized distributors?
All BC857BTT1 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 BC857BTT1 meets industry standards.
7.What is the process for return or replacement of BC857BTT1?
All BC857BTT1 units undergo pre-shipment inspection (PSI). If there is an issue with BC857BTT1, 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 BC857BTT1 part is unused and in its original packaging.
Return procedure for BC857BTT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BTT1 Tags
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