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Diodes Incorporated BC857CWQ-13
- Part No.:
- BC857CWQ-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857CWQ-13.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:3,116
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Product details
Overview
BC857CWQ-13 from Diodes Incorporated is a 45V PNP small-signal bipolar junction transistor (BJT) in SOT323 package, rated for -100mA continuous collector current, -45V VCEO, and AEC-Q101 qualified for automotive use. It delivers hFE of 420–800 at -2mA/-5V, fT ≥100MHz, and VCE(sat) ≤ -300mV at -10mA/-0.5mA, enabling reliable switching and audio-frequency amplification in engine control modules and body electronics.
For engineers reviewing the BC857CWQ-13 datasheet, BC857CWQ-13 pinout, BC857CWQ-13 application, or BC857CWQ-13 equivalent, key selection criteria include its automotive qualification status, SOT323 thermal resistance (625°C/W), low VBE(on) (-600 to -750mV), complementary pairing with BC847CWQ, and suitability for space-constrained, high-reliability discrete amplifier and load-switch circuits.
Technical Context
This PNP BJT operates in active, saturation, and cutoff regions with defined breakdown limits: VCBO = -50V, VCEO = -45V, and VEBO = -5.0V. Its DC current gain exhibits strong temperature stability-hFE remains functional from -65°C to +150°C-with typical values of 520 at -2mA/-5V and reduced but usable gain at -100mA.
Switching performance is characterized by VCE(sat) ≤ -650mV at -100mA/-5mA and transition frequency fT = 100–200MHz under -5V/-10mA bias. Noise figure is specified at 10dB (200Hz bandwidth, RS = 2kΩ), supporting low-noise preamplifier stages in sensor signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -45V - Maximum safe collector-emitter voltage before avalanche conduction in switching applications |
| IC | -100mA - Continuous collector current rating defining maximum linear or saturated load drive capability |
| hFE | 420–800 - DC current gain range at -2mA/-5V, directly determining base drive requirements for gain-stable amplification |
| fT | 100–200MHz - Unity-gain frequency confirming usable bandwidth up to mid-VHF for RF-coupled AF stages |
| VCE(sat) | -300mV max at -10mA/-0.5mA - Low saturation voltage enabling efficient low-side switching with minimal power loss |
| RθJA | 625°C/W - Junction-to-ambient thermal resistance on standard FR4 PCB, limiting power dissipation to 200mW at +25°C ambient |
| ESD HBM | 4000V - Human Body Model robustness level ensuring handling survivability during automotive assembly |
Pinout & Package
Package: SOT323 - Surface-mount plastic package measuring 2.15mm × 2.10mm × 0.95mm (L × W × H), with matte tin-plated leads, moisture sensitivity level 1, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal in PNP configuration | Connected to higher potential rail; defines reference for base-emitter forward bias and current sourcing path |
| 2 (Base) | Control electrode for minority-carrier injection | Requires negative bias relative to emitter to turn on; determines IC via hFE scaling of IB |
| 3 (Collector) | Output current terminal | Connected to load; voltage swing limited by VCEO and thermal derating above +25°C ambient |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, mechanical shock, and ESD stress per JESD22 standards |
| Complementary NPN pairing | Direct match with BC847CWQ enables balanced push-pull output stages without gain mismatch or thermal drift asymmetry |
| Low VBE(on) | -600 to -750mV at -2mA ensures stable turn-on with minimal base drive overhead in battery-powered systems |
| Green packaging | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets automotive environmental compliance mandates |
| Automated insertion compatibility | Standardized SOT323 footprint and lead coplanarity support high-yield pick-and-place and reflow assembly |
Applications
| Engine Control Unit (ECU) Signal Conditioning | Automotive Door Module Switch Drivers |
|---|---|
Use Scenario: Amplifying low-level crankshaft position sensor signals prior to MCU ADC sampling. IC Role / Device Role / Timing Role: PNP common-emitter preamplifier providing 20–30dB voltage gain with matched noise performance. Use Value: hFE stability across -40°C to +125°C ensures consistent gain calibration without software compensation. | Use Scenario: Driving LED indicators and small solenoid locks in door control modules. IC Role / Device Role / Timing Role: Low-side switch controlling 5–20mA loads with fast turn-off enabled by low Cobo (3–4.5pF). Use Value: VCE(sat) ≤ -300mV minimizes heat generation in sealed enclosures with limited airflow. |
| Body Control Module (BCM) Voltage-Level Translation | Automotive HVAC Fan Speed Control |
Use Scenario: Translating 3.3V logic outputs from microcontrollers to 5V/12V peripheral interfaces. IC Role / Device Role / Timing Role: Inverter stage using fixed-base bias to shift logic thresholds while maintaining noise margin. Use Value: VEBO = -5.0V allows safe operation with reverse-biased base-emitter junctions during level transitions. | Use Scenario: PWM-controlled current sink for brushless fan motor gate drivers. IC Role / Device Role / Timing Role: High-speed switching element operating at 20–50kHz with minimal storage time delay. Use Value: fT ≥100MHz supports clean square-wave edges without overshoot or ringing in gate drive paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857BWT1G | Same VCEO (-45V), lower hFE range (220–475), SOT-323 package, no AEC-Q101 certification | Not qualified for automotive safety-critical functions; suitable only for industrial or consumer-grade replacement | Select when cost sensitivity outweighs automotive qualification requirements and gain tolerance >20% is acceptable |
| MMBT857 | Identical electrical specs and AEC-Q101 rating, but marked "857" instead of "K3G"; same SOT-323 footprint | No functional difference; alternate marking scheme used by different Diodes production lines | Drop-in substitute with identical thermal, switching, and gain behavior-verified for dual-sourcing in Tier-1 BOMs |
Compared with BC857BWT1G, BC857CWQ-13 provides guaranteed automotive qualification and higher minimum hFE; versus MMBT857, it shares identical performance but differs only in top-marking code-making it interchangeable in validated designs requiring traceable K3G-lot identification.
Availability
BC857CWQ-13 is available at Aetrix Electronics and suitable for engine control units, body control modules, and automotive lighting systems requiring stable component supply with full AEC-Q101 traceability and IATF16949 manufacturing assurance.
Supply support for BC857CWQ-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets with ISO/TS 16949 and IATF16949 certified facilities.
The BC857CWQ belongs to Diodes' automotive-qualified small-signal transistor product line, engineered specifically for signal amplification, switching, and interface functions in harsh-environment vehicle subsystems where long-term parametric stability is mandatory.
FAQ
What is the maximum allowable junction temperature for BC857CWQ-13?
The absolute maximum junction temperature is +150°C, with continuous operation permitted from -65°C to +150°C. Derating begins at +25°C ambient per the 625°C/W RθJA value-power dissipation must be reduced by 0.32mW/°C above +25°C to maintain TJ ≤ +150°C on standard FR4 PCBs.
Is BC857CWQ-13 compatible with lead-free reflow profiles?
Yes-BC857CWQ-13 uses matte tin-plated leads and complies with JEDEC J-STD-020 moisture sensitivity level 1, supporting standard lead-free reflow profiles up to 260°C peak temperature. Its green molding compound is halogen- and antimony-free, meeting IPC/JEDEC industry standards for Pb-free assembly.
How does BC857CWQ-13 differ from BC857BWQ?
BC857CWQ-13 has hFE = 420–800 (Category C), while BC857BWQ specifies hFE = 220–475 (Category B). Both share identical voltage/current ratings, package, and AEC-Q101 qualification-but BC857CWQ guarantees higher minimum gain, critical for low-base-drive applications like sensor amplifiers.
Can BC857CWQ-13 replace BC856CWQ in existing designs?
No-BC856CWQ is an NPN transistor (complementary to BC846CWQ), whereas BC857CWQ is PNP. Swapping them would invert logic polarity and likely cause circuit failure. For PNP replacement, verify matching VCEO, IC, hFE, and SOT323 pinout; BC857BWQ or MMBT857 are valid alternatives.
BC857CWQ-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 420 @ 2mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC857CWQ-13 FAQ
1.How can I place an order for BC857CWQ-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CWQ-13 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 BC857CWQ-13 reliable?
The price and inventory of BC857CWQ-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CWQ-13 is usually 5 days.
3.What payment methods are accepted for BC857CWQ-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CWQ-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CWQ-13?
BC857CWQ-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CWQ-13 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 BC857CWQ-13?
For technical support, including BC857CWQ-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CWQ-13 requirements.
6.How does Aetrix verify that BC857CWQ-13 is sourced from the original manufacturer or authorized distributors?
All BC857CWQ-13 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 BC857CWQ-13 meets industry standards.
7.What is the process for return or replacement of BC857CWQ-13?
All BC857CWQ-13 units undergo pre-shipment inspection (PSI). If there is an issue with BC857CWQ-13, 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 BC857CWQ-13 part is unused and in its original packaging.
Return procedure for BC857CWQ-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CWQ-13 Tags
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