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Diodes Incorporated BC857CW-7-F
- Part No.:
- BC857CW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857CW-7-F.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:46,499
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Product details
Overview
BC857CW-7-F from Diodes Incorporated is a PNP small-signal transistor in SOT323 package, rated for VCEO = −45 V, IC = −100 mA, and hFE = 420–800 (Group C), optimized for switching and audio-frequency amplification in space-constrained PCBs.
For engineers reviewing the BC857CW-7-F datasheet, BC857CW-7-F pinout, BC857CW-7-F application, or BC857CW-7-F equivalent, key selection criteria include guaranteed high DC current gain at low collector currents, low VCE(sat) under 10 mA drive, thermal performance on minimal pad layouts, and RoHS-compliant green packaging for consumer and industrial assembly lines.
Technical Context
This device operates as a discrete PNP bipolar junction transistor with fixed emitter-base and collector-base junction structures. Its Group C hFE bin ensures consistent amplification across 2–10 mA collector loads, while the −45 V VCEO rating supports operation in moderate-voltage bias networks up to ±24 V rails.
The SOT323 package enables surface-mount automation with 0.65 mm lead pitch and 0.006 g mass. Thermal resistance of 625 °C/W (RθJA) is specified for 1 oz copper on single-sided FR4, defining maximum ambient temperature derating for continuous 200 mW dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC | −100 mA - Continuous DC collector current limit without thermal runaway on standard PCB |
| hFE (Group C) | 420–800 - Confirmed DC current gain range at VCE = −5 V, IC = −2 mA for predictable bias design |
| VCE(sat) | −75 to −650 mV - Verified saturation voltage across IC = −10 mA to −100 mA, enabling low-loss switching |
| fT | 100–200 MHz - Gain-bandwidth product confirming usable RF response up to ~100 MHz at IC = −10 mA |
| PD | 200 mW - Absolute power dissipation limit on minimum recommended copper layout under still-air conditions |
Pinout & Package
SOT323 is a 3-pin, surface-mount plastic package with 0.65 mm lead pitch, 2.15 mm × 2.10 mm body, and 0.95 mm height. It supports automated pick-and-place and reflow soldering per J-STD-020 Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current sink terminal; connects to most positive rail in PNP switch or amplifier stage |
| 2 (Base) | B | Control input; requires negative bias relative to emitter to turn on conduction |
| 3 (Collector) | C | Output terminal; carries load current toward ground or lower-potential node |
Key Features
| Feature | Design Value |
|---|---|
| High hFE Group C bin | Guarantees ≥420 current gain at 2 mA, reducing base drive requirements in low-power logic interfaces |
| Low VCE(sat) at 10 mA | ≤−300 mV ensures <300 mW loss in saturated switching, critical for battery-powered signal routing |
| SOT323 footprint compatibility | Standardized 0.65 mm pitch enables drop-in replacement with BC856/BC858 series and NPN complements |
| Lead-free & halogen-free construction | Meets RoHS 3 and JEDEC high-reliability standards, eliminating post-solder cleaning and enabling automotive-qualified derivatives |
Applications
| LED Driver Circuit | Level-Shifting Interface |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V microcontroller GPIO pins with inverted logic. IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to VCC, activated by low base voltage. Use Value: Low VCE(sat) minimizes forward voltage drop, preserving LED brightness and enabling stable 20 mA current with <0.3 V overhead. | Use Scenario: Translating 1.8 V logic outputs to 5 V domains in mixed-supply systems. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower configuration with pull-up resistor. Use Value: High hFE ensures full 5 V swing at output with <1 µA base current draw, reducing loading on source IC. |
| Audio Preamp Stage | Power Supply Enable Switch |
Use Scenario: Low-noise preamplifier for electret microphone signals in portable audio devices. IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration resistor for gain stability. Use Value: NF = 10 dB at 1 kHz confirms suitability for audio band amplification without added noise floor degradation. | Use Scenario: Enabling/disabling 12 V auxiliary rails via microcontroller control in embedded power management. IC Role / Device Role / Timing Role: High-side switch controlling PMOS gate drive or relay coil supply path. Use Value: −45 V VCEO safely isolates control logic from 12 V rail transients, preventing latch-up during hot-plug events. |
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 |
|---|---|---|---|
| BC857B-7-F | hFE = 220–475 (Group B); lower gain consistency at IC < 5 mA | Less suitable for ultra-low-base-drive circuits like micropower sensors | Select when cost priority outweighs gain margin and base current must stay below 500 nA |
| MMBT857LT1G | SOT23 package; RθJA = 357 °C/W; VCEO = −45 V; hFE = 250–600 | Larger footprint but superior thermal performance for >50 mA pulsed loads | Choose for higher-current switching where SOT23 board area is available and thermal headroom is constrained |
Compared with BC857B-7-F, BC857CW-7-F delivers tighter hFE control for precision biasing; versus MMBT857LT1G, it trades thermal capability for smaller board area-making it optimal for compact, low-to-moderate current linear and switching roles.
Availability
BC857CW-7-F is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, audio preamp stages, and power supply enable switches requiring stable component supply and JEDEC-qualified reliability.
Supply support for BC857CW-7-F 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, industry-qualified components for automotive, industrial, and consumer markets.
The BC856–BC858 series belongs to Diodes' small-signal transistor product line, engineered for automatic insertion, low-power switching, and AF amplification in space- and cost-sensitive designs.
FAQ
Is BC857CW-7-F pin-compatible with BC847CW-7-F?
No. BC857CW-7-F is a PNP transistor with E-B-C pinout (1-2-3) in SOT323, while BC847CW-7-F is its NPN complement with C-B-E pinout (1-2-3). Swapping them without circuit revision causes polarity inversion and functional failure. Always verify pin assignment using the top-view diagram in DS30251 Rev. 12-2.
What is the maximum operating temperature for continuous use?
The BC857CW-7-F has an operating junction temperature range of −55 °C to +150 °C. At ambient temperatures above +85 °C, power dissipation must be derated per Figure 1 in DS30251: at +125 °C ambient, maximum allowable PD drops to ~80 mW on standard FR4 layout due to RθJA = 625 °C/W.
Does BC857CW-7-F meet AEC-Q101 requirements?
No. BC857CW-7-F is a standard-grade part qualified to JEDEC reliability standards. For automotive applications, Diodes offers the BC857BWQ-13-F variant, which is AEC-Q101 qualified, PPAP-capable, and manufactured in IATF 16949 certified facilities-listed in their automotive products portal.
Can BC857CW-7-F replace BC857C in through-hole designs?
No. BC857CW-7-F uses SOT323 surface-mount packaging, while legacy BC857C variants typically use TO-92 or SOT23 packages with different pinouts, thermal profiles, and mounting methods. Direct substitution requires PCB redesign and validation of solder thermal profile, mechanical stress, and electrical parasitics.
BC857CW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC857CW-7-F FAQ
1.How can I place an order for BC857CW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CW-7-F 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 BC857CW-7-F reliable?
The price and inventory of BC857CW-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CW-7-F is usually 5 days.
3.What payment methods are accepted for BC857CW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CW-7-F?
BC857CW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CW-7-F 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 BC857CW-7-F?
For technical support, including BC857CW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CW-7-F requirements.
6.How does Aetrix verify that BC857CW-7-F is sourced from the original manufacturer or authorized distributors?
All BC857CW-7-F 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 BC857CW-7-F meets industry standards.
7.What is the process for return or replacement of BC857CW-7-F?
All BC857CW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC857CW-7-F, 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 BC857CW-7-F part is unused and in its original packaging.
Return procedure for BC857CW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CW-7-F Tags
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