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Nexperia USA Inc. BC856B,235
- Part No.:
- BC856B,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC856B,235.pdf
- Description:
- TRANS PNP 65V 0.1A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:52,135
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Product details
Overview
BC856B,235 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −65 V VCEO, −100 mA IC, and 220–475 hFE at VCE = −5 V, IC = −2 mA. It serves as a low-voltage switching or linear amplification device in signal routing, level translation, and discrete logic interface circuits.
For engineers reviewing the BC856B,235 datasheet, BC856B,235 pinout, BC856B,235 application, or BC856B,235 equivalent, this page delivers verified electrical specs, validated SOT23 pin mapping, real-world use cases in industrial control and consumer power management, and two confirmed alternative parts with documented parametric differences.
Technical Context
This PNP BJT operates in active or saturation mode with fixed current gain range (220–475), collector-emitter breakdown voltage of −65 V, and guaranteed VCE(sat) ≤ −650 mV at IC = −100 mA / IB = −5 mA. Its thermal resistance Rth(j-a) is 500 K/W on standard FR4 PCB.
The device exhibits typical fT = 100 MHz at VCE = −5 V, IC = −10 mA, and noise figure NF = 2–10 dB at IC = −200 µA, making it suitable for low-noise preamplifier stages and high-speed switching below 10 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −65 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in PNP switch designs. |
| IC | −100 mA - Continuous DC collector current rating; sets maximum load drive capability in active bias networks. |
| hFE | 220–475 - DC current gain at VCE = −5 V, IC = −2 mA; determines base drive resistor sizing for predictable saturation. |
| VCE(sat) | ≤ −650 mV - Collector-emitter saturation voltage at IC = −100 mA / IB = −5 mA; directly impacts conduction loss in switching applications. |
| fT | 100 MHz - Transition frequency at VCE = −5 V, IC = −10 mA; confirms usable bandwidth for audio and low-MHz signal amplification. |
| Ptot | 250 mW - Total power dissipation at Tamb ≤ 25 °C on FR4 PCB; constrains thermal design margin in compact layouts. |
Pinout & Package
SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm footprint, 0.95 mm height, and standard reflow-compatible solder pad layout per Figure 15.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires series resistor to limit IB and ensure reliable saturation or cutoff. |
| 2 | Emitter (E) | Common terminal for PNP configuration; connected to higher potential rail in high-side switch topologies. |
| 3 | Collector (C) | Output current path; sinks current when base is biased, enabling load connection between VCC and collector. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage PNP switching | Rated for −65 V VCEO and −100 mA IC, supporting robust operation in 24 V and lower industrial rails. |
| Controlled current gain spread | hFE binning of 220–475 ensures consistent base drive requirements across production lots. |
| Low saturation voltage | VCE(sat) ≤ −650 mV at full rated current enables <100 mW conduction loss in switching mode. |
| High-frequency capability | fT = 100 MHz supports stable amplification up to audio band and fast edge response in digital interfaces. |
Applications
| Industrial Sensor Interface | Consumer Power Sequencing |
|---|---|
|
Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor or potentiometer) into microcontroller ADC inputs. IC Role / Device Role / Timing Role: PNP emitter-follower configured for unity-gain voltage buffering with high input impedance and rail-to-rail swing. Use Value: Maintains signal integrity without loading the sensor, leveraging hFE ≥ 220 to minimize base current error. |
Use Scenario: Enabling/disabling auxiliary power rails (e.g., USB peripheral VBUS or display backlight) in battery-powered devices. IC Role / Device Role / Timing Role: High-side switch controlled by MCU GPIO, using BC856B,235 to invert logic and drive load to ground. Use Value: Delivers <100 mA load current with VCE(sat) ≤ −650 mV, limiting power loss to <65 mW at full load. |
| LED Driver Circuit | Discrete Logic Inverter |
|
Use Scenario: Driving low-current indicator LEDs (≤ 50 mA) from 3.3 V or 5 V logic outputs in embedded systems. IC Role / Device Role / Timing Role: Common-emitter switch with collector tied to LED anode and emitter grounded; base driven via current-limiting resistor. Use Value: Ensures full LED brightness with guaranteed saturation at IC = −50 mA and VCE(sat) ≤ −250 mV. |
Use Scenario: Implementing non-inverting or inverting logic functions where integrated gates are unavailable or over-specified. IC Role / Device Role / Timing Role: PNP-based RTL inverter stage with pull-up resistor, providing TTL-compatible output swing and fan-out ≥ 5. Use Value: Achieves propagation delay <50 ns and noise margin >0.8 V using hFE-stable BC856B,235 in saturated switching. |
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 |
|---|---|---|---|
| BC857B,235 | VCEO = −45 V (vs. −65 V); identical hFE (220–475), package, and pinout. | Not suitable for 48 V or higher supply rails; acceptable in 24 V and lower systems with tighter voltage margins. | Select when system VCC ≤ 30 V and cost optimization is prioritized over voltage headroom. |
| MMBT3906LT1G | VCEO = −40 V; hFE = 100–300; slightly higher VCE(sat) (≤ −750 mV at same conditions). | Lower gain consistency and reduced voltage margin restrict use in precision bias or higher-rail switching. | Choose only if legacy BOM compatibility or dual-source requirement mandates ON Semiconductor footprint. |
Compared with BC856B,235, BC857B,235 trades 20 V of collector-emitter voltage rating for identical gain and package, while MMBT3906LT1G offers broader industry availability but sacrifices 25 V headroom and 30% gain stability-critical in temperature-varying bias networks.
Availability
BC856B,235 is available at Aetrix Electronics and suitable for industrial sensor interfaces, consumer power sequencing, LED driver circuits, and discrete logic inverters requiring stable component supply across long-lifecycle embedded programs.
Supply support for BC856B,235 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 discrete and logic devices, with core expertise in automotive-grade and industrial-standard components.
The BC856 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-sensitive, space-constrained applications demanding predictable gain, low saturation voltage, and robust SMT manufacturability.
FAQ
Is BC856B,235 automotive-qualified?
No. BC856B,235 is explicitly marked as non-automotive qualified per Nexperia's Revision History v.9 (July 2022). It lacks AEC-Q101 stress testing and is intended for industrial, consumer, and computing applications only. Automotive alternatives require explicit "-Q" suffix variants such as BC856B-Q.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current (IBM) is −200 mA per Table 6, but continuous operation must respect the total power dissipation limit of 250 mW. At VBE(sat) ≈ −850 mV and IC = −100 mA, typical IB is −5 mA, yielding safe continuous base drive well below the peak rating.
Can BC856B,235 replace BC856A,235 in existing designs?
Yes, with verification of gain-critical nodes. BC856B has hFE = 220–475 versus BC856A's 125–250. Higher minimum gain may reduce required base drive, but could affect linearity in analog amplifier configurations-confirm bias point stability under worst-case hFE extremes.
Does BC856B,235 support wave soldering?
Yes. Nexperia's datasheet Figure 16 provides a dedicated wave soldering footprint (sot023_fw) with 2.8 mm × 4.5 mm land pattern and defined transport direction. Thermal profile must comply with JEDEC J-STD-020 for SOT23 packages, limiting peak temperature to ≤ 260 °C for ≤ 10 seconds.
BC856B,235 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BC856B,235 FAQ
1.How can I place an order for BC856B,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856B,235 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 BC856B,235 reliable?
The price and inventory of BC856B,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856B,235 is usually 5 days.
3.What payment methods are accepted for BC856B,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856B,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856B,235?
BC856B,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856B,235 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 BC856B,235?
For technical support, including BC856B,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856B,235 requirements.
6.How does Aetrix verify that BC856B,235 is sourced from the original manufacturer or authorized distributors?
All BC856B,235 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 BC856B,235 meets industry standards.
7.What is the process for return or replacement of BC856B,235?
All BC856B,235 units undergo pre-shipment inspection (PSI). If there is an issue with BC856B,235, 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 BC856B,235 part is unused and in its original packaging.
Return procedure for BC856B,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC856B,235 Tags
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MMBT3904LT1G
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MMBT3906-7-F
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