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Nexperia USA Inc. BC857CW,135
- Part No.:
- BC857CW,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857CW,135.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:9,280
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Product details
Overview
BC857CW,135 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 (SC-70) package, rated for −45 V VCEO, −100 mA IC, and offering hFE = 420–800 at VCE = −5 V and IC = −2 mA. It serves as a compact, surface-mount switching or linear amplification device in space-constrained consumer and industrial signal-path circuits.
For engineers reviewing the BC857CW,135 datasheet, BC857CW,135 pinout, BC857CW,135 application, or BC857CW,135 equivalent, key selection criteria include its guaranteed high DC current gain band, low saturation voltage under moderate drive, SC-70 thermal performance, and compatibility with reflow/wave soldering footprints per JEDEC standard.
Technical Context
The BC857CW operates as a silicon PNP BJT with epitaxial base construction, optimized for stable DC gain across temperature (−55 °C to +150 °C) and low VCE(sat) down to −250 mV at IC = −100 mA / IB = −5 mA. Its fT of 100 MHz supports audio-frequency amplification and fast digital switching up to ~10 MHz.
It features symmetrical breakdown ratings: V(BR)CBO = −50 V, V(BR)CEO = −45 V, and V(BR)EBO = −5 V, with leakage currents limited to −4 µA ICBO at Tj = 150 °C and −100 nA IEBO at VEB = −5 V - enabling reliable operation in bias-stable amplifier stages and logic-level interface circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage with open base; defines upper rail limit in PNP switch or amplifier configurations. |
| IC | −100 mA - Continuous DC collector current rating; sets maximum load-handling capability in active or saturated operation. |
| hFE | 420–800 @ VCE = −5 V, IC = −2 mA - Tight DC current gain bin ensures predictable base drive requirements and stable biasing in linear applications. |
| VCE(sat) | −250 mV max @ IC = −100 mA, IB = −5 mA - Low saturation voltage minimizes power loss and heating in switching applications with moderate loads. |
| Ptot | 200 mW @ Tamb ≤ 25 °C on FR4 PCB - Thermal dissipation limit determines usable power envelope without heatsinking in standard layouts. |
| fT | 100 MHz @ VCE = −5 V, IC = −10 mA - Transition frequency confirms suitability for audio amplification and medium-speed digital signal routing. |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance on standard FR4; informs temperature rise under steady-state bias conditions. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), 0.65 mm lead pitch, and standard reflow footprint per Figure 15.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; typically tied to higher potential (e.g., VCC) in common-emitter switches. |
| 3 | Collector (C) | Current sink terminal; connects to load or next stage; polarity must respect −VCE and −IC conventions. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE bin (420–800) | Reduces required base drive current by >2× vs. standard BC857W, easing microcontroller GPIO sourcing in low-power switches. |
| Low VCE(sat) (−250 mV max) | Minimizes conduction loss in battery-powered or thermally constrained designs where <100 mW dissipation is critical. |
| SOT323 package | Enables <1.5 mm² PCB area usage and compatibility with automated pick-and-place and reflow processes for high-volume manufacturing. |
| JEDEC SC-70 compliance | Ensures mechanical and thermal interoperability with industry-standard test sockets, handling equipment, and thermal simulation models. |
Applications
| LED Driver Circuit | Microcontroller I/O Interface |
|---|---|
|
Use Scenario: Driving discrete indicator LEDs from 3.3 V or 5 V microcontroller outputs with current limiting via emitter resistor. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking LED current through collector while emitter connects to supply rail. Use Value: High hFE allows full LED current (e.g., 20 mA) with <50 µA base drive, preserving MCU output drive strength and reducing GPIO loading. |
Use Scenario: Level-shifting and inverting logic signals between mixed-voltage domains (e.g., 1.8 V FPGA output to 5 V peripheral input). IC Role / Device Role / Timing Role: Single-transistor inverter with pull-up resistor, providing clean logic inversion and rail-to-rail swing at the output node. Use Value: Fast fT and low VCE(sat) ensure sub-100 ns propagation delay and minimal voltage drop, maintaining timing margins in synchronous interfaces. |
| Audio Pre-amplifier Stage | Power Supply Enable Switch |
|
Use Scenario: Low-noise small-signal amplification of microphone or sensor outputs in portable audio devices. IC Role / Device Role / Timing Role: Common-emitter amplifier biased in linear region, using emitter degeneration for stability and gain control. Use Value: NF = 2–10 dB at 1 kHz enables SNR preservation in front-end gain stages without requiring costly low-noise op-amps. |
Use Scenario: Enabling/disabling auxiliary power rails (e.g., 3.3 V or 1.2 V) in multi-rail embedded systems based on processor GPIO state. IC Role / Device Role / Timing Role: High-side PNP switch controlling PMOS gate or LDO enable pin, activated by low GPIO assertion. Use Value: Guaranteed −45 V VCEO and −100 mA IC support robust rail sequencing and fault-tolerant enable logic in industrial controllers. |
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 |
|---|---|---|---|
| BC857BW,135 | hFE = 220–475 (lower gain band); same VCEO, IC, and package | Less suitable for ultra-low-base-drive applications but offers tighter gain tolerance for predictable bias design | Select when gain consistency matters more than minimum drive current; preferred for production-critical analog bias networks |
| MMBT3906LT1G | hFE = 100–300; VCEO = −40 V; SOT-23 package (larger footprint, higher Rth(j-a)) | Lower gain and thermal performance; widely available but less space-efficient | Choose only if SOT-23 is mandated by legacy layout or if cost sensitivity outweighs size/power trade-offs |
Compared with BC857BW,135, the BC857CW,135 delivers higher and more consistent current gain for reduced base drive burden, while versus MMBT3906LT1G it provides superior gain, tighter specs, and smaller footprint - making it optimal for miniaturized, low-power, high-reliability PNP switching and amplification.
Availability
BC857CW,135 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller I/O interfaces, audio pre-amplifier stages, and power supply enable switches requiring stable component supply, consistent parametric binning, and long-term SMT manufacturability.
Supply support for BC857CW,135 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 semiconductor expert focused on high-volume, high-reliability essential components including logic, discretes, MOSFETs, and ESD protection devices.
The BC857CW belongs to Nexperia's BC856/857/858W series of general-purpose PNP transistors, designed specifically for cost-sensitive, space-constrained consumer and industrial applications demanding consistent gain, low saturation voltage, and JEDEC-standard SMT compatibility.
FAQ
What is the maximum operating junction temperature for BC857CW,135?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in Table 6 of the Nexperia datasheet. Operation above this threshold risks permanent degradation of hFE, leakage, and bond-wire integrity. Derating is required above ambient temperatures of 25 °C per the Rth(j-a) = 625 K/W thermal resistance value.
Does BC857CW,135 support wave soldering?
Yes - Nexperia provides a dedicated wave soldering footprint (Figure 16) with 3.65 mm × 2.1 mm solder lands and specified solder resist openings. The SOT323 package is qualified for both reflow and wave processes, provided conveyor speed, preheat, and dwell time comply with IPC-J-STD-020 and Nexperia's recommended profiles.
How does the BC857CW differ from BC857AW or BC857BW in practical circuit design?
The BC857CW has a higher hFE range (420–800) than BC857AW (125–250) and BC857BW (220–475), directly reducing required base current by up to 3× in switching applications. This allows weaker drive sources (e.g., low-current GPIOs) to fully saturate the transistor without added buffering, simplifying schematic and layout.
Is BC857CW,135 automotive-qualified?
No - the Nexperia datasheet explicitly states that BC857CW is not automotive-qualified. It is rated for industrial and consumer use only (−55 °C to +150 °C operating range), with no AEC-Q101 stress testing or automotive-specific reliability reporting. For automotive applications, Nexperia recommends alternatives like the PBSS4041PAS or similar qualified PNP transistors.
BC857CW,135 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 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
BC857CW,135 FAQ
1.How can I place an order for BC857CW,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CW,135 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,135 reliable?
The price and inventory of BC857CW,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CW,135 is usually 5 days.
3.What payment methods are accepted for BC857CW,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CW,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CW,135?
BC857CW,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CW,135 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,135?
For technical support, including BC857CW,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CW,135 requirements.
6.How does Aetrix verify that BC857CW,135 is sourced from the original manufacturer or authorized distributors?
All BC857CW,135 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,135 meets industry standards.
7.What is the process for return or replacement of BC857CW,135?
All BC857CW,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC857CW,135, 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,135 part is unused and in its original packaging.
Return procedure for BC857CW,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CW,135 Tags
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