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Nexperia USA Inc. BC856W,135
- Part No.:
- BC856W,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC856W,135.pdf
- Description:
- TRANS PNP 65V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:6,570
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Product details
Overview
BC856W,135 from Nexperia is a PNP bipolar junction transistor in SOT323 (SC-70) package, rated for −65 V VCEO, −100 mA IC, and DC current gain (hFE) of 125–475 at VCE = −5 V, IC = −2 mA. It serves as a general-purpose switching and amplification device in low-power analog and digital signal paths, including level-shifting circuits in portable instrumentation and LED driver bias stages.
For engineers reviewing the BC856W,135 datasheet, BC856W,135 pinout, BC856W,135 application, or BC856W,135 equivalent, key selection criteria include its −65 V collector-emitter breakdown voltage, 200 mW power dissipation at Tamb ≤ 25 °C, SOT323 thermal resistance (Rth(j-a) = 625 K/W), and verified base-emitter saturation voltage of −850 mV at IC = −100 mA / IB = −5 mA.
Technical Context
The BC856W,135 operates as a discrete PNP BJT with fixed emitter-base and collector-base junctions optimized for linear amplification and saturated switching. Its hFE range (125–475) supports predictable current mirroring in bias networks, while its −65 V VCEO rating enables use in 48 V rail interfaces and negative supply regulation circuits.
Thermal performance is defined for FR4 PCB mounting (single-sided, 35 µm Cu, tin-plated), with Rth(j-a) = 625 K/W and maximum junction temperature of 150 °C. The device exhibits VCE(sat) ≤ −600 mV at IC = −100 mA / IB = −5 mA and fT = 100 MHz, confirming suitability for audio-frequency amplification and low-speed digital switching up to ~10 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −65 V: Maximum safe collector-emitter voltage under open-base condition; enables use in −48 V telecom and industrial control rails. |
| IC | −100 mA continuous: Supports load switching for LEDs, relays, and small-signal logic buffers without derating at 25 °C. |
| hFE | 125–475 at VCE = −5 V, IC = −2 mA: Ensures stable biasing in amplifier stages with predictable gain variation across production lots. |
| VCE(sat) | ≤ −600 mV at IC = −100 mA, IB = −5 mA: Minimizes conduction loss in saturated switch applications, reducing heat generation in compact layouts. |
| Ptot | 200 mW at Tamb ≤ 25 °C: Defines thermal design envelope for PCB trace width and copper pour when mounted on standard FR4. |
| fT | 100 MHz: Confirms usable bandwidth for audio preamplifiers, oscillator biasing, and low-speed pulse shaping circuits. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.15 mm footprint, 0.4 mm nominal thickness, 3-terminal configuration with gull-wing leads for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires ≥ −5 mA drive for full saturation at IC = −100 mA. |
| 2 | Emitter (E) | Common terminal for PNP operation; connected to higher potential rail (e.g., −VCC or ground-referenced bias network). |
| 3 | Collector (C) | Output current sink node; handles up to −100 mA continuous with ≤ −600 mV drop when saturated. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage PNP switching | Rated for −65 V VCEO, supporting robust operation in negative-rail systems without derating below −40 V. |
| High-current gain consistency | hFE binning (125–475) ensures predictable base drive requirements across manufacturing lots for production repeatability. |
| Ultra-compact SMT footprint | SOT323 package occupies <1.6 mm² PCB area, enabling high-density placement in space-constrained wearables and sensor modules. |
| Thermally characterized mounting | Rth(j-a) = 625 K/W specified for standard FR4 layout, allowing accurate junction temperature estimation without custom thermal modeling. |
Applications
| LED Driver Bias Stage | Level-Shifting Interface |
|---|---|
|
Use Scenario: Driving low-current indicator LEDs from microcontroller GPIO pins operating at 0 V / −3.3 V logic levels. IC Role / Device Role / Timing Role: PNP current sink switch controlling LED anode connection to negative rail; provides inversion and voltage translation. Use Value: VCE(sat) ≤ −600 mV ensures >90% LED forward voltage utilization at IF = 20 mA, minimizing wasted power in battery-powered devices. |
Use Scenario: Translating TTL/CMOS signals between +3.3 V and −5 V domains in mixed-supply test equipment. IC Role / Device Role / Timing Role: Discrete level shifter using emitter-follower and common-emitter configurations to invert and shift logic thresholds. Use Value: hFE ≥ 125 guarantees reliable switching with ≤ 100 µA base drive, reducing loading on upstream drivers and preserving signal integrity. |
| Audio Preamp Current Source | Relay Coil Driver |
|
Use Scenario: Providing stable bias current for JFET or op-amp input stages in portable audio codecs and microphone preamps. IC Role / Device Role / Timing Role: Constant-current source configured in common-emitter with emitter degeneration resistor. Use Value: Tight hFE tolerance (125–475) and low VBE drift (<±2 mV/°C) maintain ±2% current accuracy over −40 °C to +85 °C ambient. |
Use Scenario: Switching 24 V DC relay coils drawing up to 80 mA in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Saturated PNP switch sinking coil current to ground-referenced return path. Use Value: −65 V VCEO rating exceeds relay flyback spikes (typically <−50 V), eliminating need for external clamping diodes in most designs. |
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 |
|---|---|---|---|
| BC857W,135 | VCEO = −45 V, hFE = 125–800; otherwise identical SOT323 package and pinout. | Lower voltage rating restricts use to ≤−36 V systems; wider hFE range increases base drive variability in precision bias networks. | Select when higher hFE is needed for ultra-low base current drive, and system voltage remains ≤−40 V. |
| BC846W,135 | NPN complement; same VCEO = 65 V, IC = 100 mA, SOT323 package, but opposite polarity and pinout (1=C, 2=B, 3=E). | Requires circuit topology inversion (e.g., high-side vs. low-side switching); not interchangeable without board redesign. | Choose only when NPN topology is mandated by existing schematic architecture or complementary pair requirements. |
Compared with BC856W,135, BC857W,135 trades 20 V lower breakdown for broader hFE spread-beneficial where gain variation is tolerable but voltage headroom is ample-while BC846W,135 offers polarity reversal at identical voltage/current ratings, necessitating full schematic and layout revision for substitution.
Availability
BC856W,135 is available at Aetrix Electronics and suitable for LED driver bias stages, level-shifting interfaces, audio preamp current sources, and relay coil drivers requiring stable component supply in high-mix, low-volume production.
Supply support for BC856W,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 leading global semiconductor manufacturer specializing in high-performance, energy-efficient discrete and logic devices, with core expertise in automotive-grade and industrial reliability standards.
The BC856W,135 belongs to Nexperia's BC856/857/858W series of general-purpose PNP transistors, designed specifically for cost-sensitive, space-constrained applications demanding consistent DC gain and robust SMT manufacturability in consumer, computing, and industrial electronics.
FAQ
What is the maximum allowable junction temperature for BC856W,135?
The absolute maximum junction temperature (Tj) for BC856W,135 is 150 °C, as defined in IEC 60134 limiting values. This limit applies under all operating conditions, and sustained operation above 125 °C requires thermal derating of Ptot per the Rth(j-a) = 625 K/W specification on FR4 PCB.
Does BC856W,135 have a specified noise figure?
Yes, BC856W,135 has a typical noise figure (NF) of 2 dB at IC = −200 µA, VCE = −5 V, RS = 2 kΩ, f = 1 kHz, and bandwidth = 200 Hz. This value is measured under small-signal conditions and supports its use in low-noise preamplifier bias networks.
Can BC856W,135 be used in avalanche mode?
No, BC856W,135 is not characterized or rated for avalanche operation. Its V(BR)CEO = −65 V is a DC breakdown limit under open-base conditions; intentional operation near or beyond this voltage risks irreversible junction damage and is outside the device's qualified operating envelope.
What is the marking code for BC856W,135 on the package?
The top-side marking for BC856W,135 is "3D%", where "%" is a placeholder for the manufacturing site code. This laser-marked identifier is located on the device body in the SOT323 package and matches Nexperia's official ordering documentation and traceability standards.
BC856W,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):
- 65 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 125 @ 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
BC856W,135 FAQ
1.How can I place an order for BC856W,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856W,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 BC856W,135 reliable?
The price and inventory of BC856W,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856W,135 is usually 5 days.
3.What payment methods are accepted for BC856W,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856W,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856W,135?
BC856W,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856W,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 BC856W,135?
For technical support, including BC856W,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856W,135 requirements.
6.How does Aetrix verify that BC856W,135 is sourced from the original manufacturer or authorized distributors?
All BC856W,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 BC856W,135 meets industry standards.
7.What is the process for return or replacement of BC856W,135?
All BC856W,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC856W,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 BC856W,135 part is unused and in its original packaging.
Return procedure for BC856W,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC856W,135 Tags
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