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onsemi BC856AMTF
- Part No.:
- BC856AMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC856AMTF.pdf
- Description:
- TRANS PNP 65V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,149
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Product details
Overview
BC856AMTF from ON Semiconductor is a PNP epitaxial silicon transistor in SOT-23 package, rated for -65 V VCEO, -100 mA IC, 310 mW power dissipation, with hFE of 110–220 at -5 V VCE and -2 mA IC, used in low-noise amplifier and general-purpose switching circuits.
For engineers reviewing the BC856AMTF datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, SOT-23 footprint compatibility, DC current gain classification (A-grade), low saturation voltage (-90 mV typical at -10 mA/-0.5 mA), and noise figure (2 dB typical at 1 kHz).
Technical Context
The BC856AMTF operates as a discrete bipolar junction transistor with fixed PNP polarity and epitaxial base construction, optimized for linear amplification and saturated switching. Its hFE range (110–220) and low VBE(sat) (-700 mV typ.) support stable biasing in emitter-follower and common-emitter configurations.
Thermal performance is defined by a 150°C maximum junction temperature and 310 mW collector power dissipation at TA = 25°C. The device exhibits 6 pF output capacitance at -10 V VCB, enabling use in audio-frequency and low-speed digital signal paths up to 150 MHz fT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -65 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (DC) | -100 mA - Continuous collector current rating defining maximum steady-state load drive capability. |
| hFE | 110–220 - DC current gain range at -5 V VCE, -2 mA IC, specifying predictable base drive requirements. |
| VCE(sat) | -90 mV (typ.) at -10 mA/-0.5 mA - Low saturation voltage enabling efficient switching with minimal conduction loss. |
| fT | 150 MHz - Current gain-bandwidth product indicating usable frequency limit for small-signal amplification. |
| Cob | 6 pF at -10 V VCB - Output capacitance affecting high-frequency response and stability in amplifier stages. |
| NF | 2 dB (typ.) at 1 kHz - Noise figure confirming suitability for low-noise preamplifier applications. |
Pinout & Package
SOT-23 plastic surface-mount package with 3-terminal configuration, 1.30 mm × 1.90 mm body size, 0.95 mm lead pitch, and gull-wing leads for reflow soldering compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on. |
| 2 | Emitter | Current source terminal in PNP topology; connected to higher potential in typical circuit configurations. |
| 3 | Collector | Current sink terminal; carries load current to lower-potential node when transistor is active. |
Key Features
| Feature | Design Value |
|---|---|
| PNP Epitaxial Construction | Enables precise hFE control and consistent gain matching across production lots. |
| Low Noise Figure (2 dB) | Supports high-fidelity audio preamplifier stages without introducing measurable signal degradation. |
| Complementary Pairing | Designed as PNP counterpart to BC846–BC850 NPN series, simplifying push-pull and differential circuit design. |
| SOT-23 Tape & Reel Packaging | Enables automated pick-and-place assembly with 3000-unit reels, reducing manufacturing handling cost. |
| hFE Classification (A-grade) | Guarantees 110–220 DC current gain range, allowing predictable base resistor sizing in production designs. |
Applications
| Audio Preamp Stage | Level-Shifting Switch |
|---|---|
Use Scenario: Amplifying weak microphone or line-level signals in portable audio devices before ADC sampling. IC Role / Device Role / Timing Role: PNP small-signal amplifier operating in common-emitter mode with resistive bias network. Use Value: 2 dB noise figure and 150 MHz fT preserve signal integrity across 20 Hz–20 kHz bandwidth without added distortion. |
Use Scenario: Inverting logic-level signals between 3.3 V microcontroller GPIO and 5 V peripheral interface lines. IC Role / Device Role / Timing Role: Saturated PNP switch configured as active-low level shifter with pull-up resistor. Use Value: -90 mV VCE(sat) ensures <100 mV voltage drop during conduction, maintaining clean logic thresholds. |
| LED Driver Circuit | Current Mirror Reference |
Use Scenario: Driving indicator LEDs in industrial control panels where low-side switching is not feasible. IC Role / Device Role / Timing Role: PNP constant-current sink with emitter resistor, delivering stable LED brightness. Use Value: -100 mA IC rating and 310 mW power dissipation allow direct drive of up to 3 standard LEDs in series. |
Use Scenario: Establishing matched reference currents in analog sensor conditioning circuits or op-amp bias networks. IC Role / Device Role / Timing Role: One side of a two-transistor current mirror with matched hFE and thermal tracking. Use Value: Tight hFE classification (110–220) and epitaxial process ensure <5% current mismatch under matched layout conditions. |
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 |
|---|---|---|---|
| BC856BMTF | Higher hFE range (200–450) with identical VCEO, IC, and package. | Better suited for high-gain amplifier stages requiring lower base drive current. | Select BC856BMTF when tighter gain control or reduced base current is required; otherwise BC856AMTF offers broader tolerance margin. |
| MMBT856 | Same electrical specs and SOT-23 package; ON Semiconductor rebranded version post-Fairchild integration. | No functional or layout difference; fully interchangeable in existing designs. | MMBT856 is the updated ON Semiconductor orderable part number replacing BC856AMTF in new designs per naming policy. |
Compared with BC856BMTF and MMBT856, the BC856AMTF provides mid-range hFE stability ideal for general-purpose switching where predictable, moderate gain is preferred over maximum amplification or legacy part continuity.
Availability
BC856AMTF is available at Aetrix Electronics and suitable for audio preamplifiers, logic-level shifters, and LED driver circuits requiring stable component supply and SOT-23 footprint consistency.
Supply support for BC856AMTF 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC856AMTF belongs to ON Semiconductor's legacy small-signal transistor portfolio, originally developed by Fairchild for general-purpose amplification and switching in space-constrained PCB layouts.
FAQ
What is the pin configuration of the BC856AMTF?
The BC856AMTF uses a standard SOT-23 package with pin 1 as Base, pin 2 as Emitter, and pin 3 as Collector. This configuration is confirmed in the Fairchild BC856–BC860 datasheet Rev. B and maintained in ON Semiconductor's documentation. The BC856AMTF must be mounted with correct orientation to ensure proper PNP biasing in circuit operation.
What does the "M" and "TF" suffix mean in BC856AMTF?
In BC856AMTF, "M" denotes matte-finish package surface treatment to reduce reflectivity during optical inspection, and "TF" indicates tape-and-reel packaging format with 3000 units per reel. These suffixes do not affect electrical performance but define physical handling and assembly compatibility for BC856AMTF in automated manufacturing.
Is BC856AMTF RoHS compliant?
Yes, BC856AMTF is RoHS compliant per ON Semiconductor's product compliance documentation. As a Fairchild-originated part integrated into ON Semiconductor's portfolio, BC856AMTF meets EU Directive 2011/65/EU requirements for restricted substances, including lead-free terminations and halogen-free molding compound.
How does BC856AMTF differ from BC857AMTF?
The BC856AMTF has a -65 V VCEO rating and -80 V VCBO, while BC857AMTF is rated for -45 V VCEO and -50 V VCBO. Both share identical hFE classification (A-grade), SOT-23 package, and pinout, but BC856AMTF supports higher-voltage switching applications where collector-emitter stress exceeds 45 V.
Can BC856AMTF replace BC856BMTF in an existing design?
BC856AMTF can replace BC856BMTF only if the circuit tolerates lower hFE (110–220 vs. 200–450); gain-dependent stages like high-impedance amplifiers may require bias adjustment. The BC856AMTF shares identical package, pinout, and absolute maximum ratings, so no PCB changes are needed-only verification of DC operating point stability.
BC856AMTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 110 @ 2mA, 5V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BC856AMTF FAQ
1.How can I place an order for BC856AMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856AMTF 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 BC856AMTF reliable?
The price and inventory of BC856AMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856AMTF is usually 5 days.
3.What payment methods are accepted for BC856AMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856AMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856AMTF?
BC856AMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856AMTF 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 BC856AMTF?
For technical support, including BC856AMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856AMTF requirements.
6.How does Aetrix verify that BC856AMTF is sourced from the original manufacturer or authorized distributors?
All BC856AMTF 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 BC856AMTF meets industry standards.
7.What is the process for return or replacement of BC856AMTF?
All BC856AMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC856AMTF, 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 BC856AMTF part is unused and in its original packaging.
Return procedure for BC856AMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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