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onsemi BC856BMTF
- Part No.:
- BC856BMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC856BMTF.pdf
- Description:
- TRANS PNP 65V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,492
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Product details
Overview
BC856BMTF from ON Semiconductor is a PNP epitaxial silicon transistor in SOT-23 package, rated for -65 V VCEO, -100 mA IC, and 310 mW power dissipation, with hFE of 200–450 at -5 V VCE and -2 mA IC, used in low-noise amplifier and general-purpose switching circuits.
For engineers reviewing the BC856BMTF datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SOT-23 terminal mapping, confirmed hFE classification (B-grade), noise performance (2 dB NF @ 1 kHz), and direct alternatives for discrete PNP switching/amplifier design.
Technical Context
The BC856BMTF operates as a medium-voltage, medium-current PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its -65 V VCEO rating supports rail-to-rail operation in negative-supply logic interfaces, while its 150 MHz fT enables audio-frequency signal amplification.
It features low VBE(sat) (-700 mV typ. at -10 mA/-0.5 mA) and low Cob (6 pF at -10 V), enabling fast turn-off and minimal capacitive loading in high-speed digital buffers and analog gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -65 V - Supports operation in -48 V telecom bias rails and industrial control logic with margin against transients. |
| IC (DC) | -100 mA - Sufficient drive capability for LED loads, relay coils, and small-signal logic-level translation. |
| hFE | 200–450 - Ensures stable current gain across production lots for predictable base drive sizing in amplifier bias networks. |
| fT | 150 MHz - Enables use in audio preamplifiers and RF detector stages up to ~50 MHz with adequate gain margin. |
| NF | 2 dB @ 1 kHz - Confirmed low-noise performance suitable for microphone preamp and sensor signal conditioning. |
| PC | 310 mW - Allows continuous operation at ambient temperatures ≤100°C without heatsinking in SOT-23 footprint. |
| Cob | 6 pF @ -10 V - Minimizes Miller effect in high-gain common-emitter configurations and improves switching edge fidelity. |
Pinout & Package
SOT-23 plastic surface-mount package with 3-pin configuration, 1.3 mm × 2.9 mm footprint, 1.1 mm height, and JEDEC-compliant thermal profile for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input requiring ~0.5 mA drive for full saturation; polarity-sensitive for PNP operation. |
| 2 | Emitter | Common reference node tied to higher potential (e.g., VCC or ground return); carries full load current. |
| 3 | Collector | Output node connected to load; reverse-biased during cutoff; sinks current when active. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise amplifier grade | 2 dB noise figure at 1 kHz, validated for sensor front-end and audio preamp applications. |
| B-grade hFE binning | 200–450 DC current gain range ensures consistent bias point stability across production batches. |
| SOT-23 tape-and-reel packaging | 3000-unit reels enable automated pick-and-place assembly with industry-standard feeder compatibility. |
| Complementary pairing | Direct complement to BC847B/BC848B NPN devices for push-pull output stages and differential amplifiers. |
Applications
| Audio Preamp Stage | Logic-Level Translation |
|---|---|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable audio devices. IC Role / Device Role / Timing Role: Small-signal PNP amplifier configured in common-emitter topology with emitter degeneration. Use Value: 2 dB NF and 150 MHz fT preserve signal integrity and bandwidth up to 20 kHz without added distortion. |
Use Scenario: Converting 3.3 V CMOS logic outputs to interface with legacy -5 V TTL inputs in mixed-voltage systems. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-base configuration. Use Value: -65 V VCEO and -100 mA IC support robust voltage translation with fast edge response and low propagation delay. |
| Relay Driver Circuit | Current Mirror Reference |
Use Scenario: Driving 12 V/50 mA electromagnetic relays in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Saturated switch with base resistor network ensuring hard turn-on and low VCE(sat). Use Value: -250 mV VCE(sat) at -10 mA/-0.5 mA minimizes power loss and heat generation in compact enclosures. |
Use Scenario: Providing matched current sources in analog sensor conditioning ICs and precision ADC bias networks. IC Role / Device Role / Timing Role: Active component in two-transistor current mirror with emitter degeneration resistors. Use Value: Tight hFE binning (200–450) and low VBE(on) variation (-600 to -750 mV) improve mirror accuracy and temperature tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857BMTF | -45 V VCEO, -100 mA IC, same hFE bin and SOT-23 package | Limited to lower-voltage rails; unsuitable for -48 V telecom or industrial control where BC856BMTF's -65 V rating is required | Select BC857BMTF only when system VCC ≤ -40 V and cost optimization is prioritized over voltage margin |
| MMBT3906LT1G | -40 V VCEO, -200 mA IC, hFE 100–300, same SOT-23 footprint | Higher current capability but lower voltage rating and wider hFE spread reduces predictability in precision bias designs | Prefer MMBT3906LT1G for higher-load switching where VCEO margin is not critical and tighter thermal resistance is needed |
Compared with BC856BMTF, BC857BMTF trades 20 V of collector-emitter breakdown for identical gain binning and cost, while MMBT3906LT1G offers +100 mA current headroom at the expense of 25 V VCEO reduction and looser hFE tolerance-making BC856BMTF optimal for voltage-critical, noise-sensitive, and gain-stable applications.
Availability
BC856BMTF is available at Aetrix Electronics and suitable for audio preamplifiers, industrial relay drivers, and logic-level translators requiring stable component supply, consistent hFE binning, and low-noise performance.
Supply support for BC856BMTF 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The BC856BMTF belongs to ON Semiconductor's legacy discrete transistor portfolio, designed for general-purpose PNP amplification and switching in space-constrained, cost-sensitive applications requiring reliability and parametric consistency.
FAQ
What is the hFE range specified for BC856BMTF?
The BC856BMTF is binned to hFE = 200–450 at VCE = -5 V and IC = -2 mA, as confirmed in the Fairchild/ON Semiconductor datasheet Rev. B. This B-grade classification ensures predictable base current requirements in amplifier bias networks and switching driver circuits using BC856BMTF.
Does BC856BMTF support low-noise audio applications?
Yes, BC856BMTF has a noise figure of 2 dB at VCE = -5 V, IC = -200 µA, RG = 2 kΩ, and f = 1 kHz, making it suitable for electret microphone preamplifiers and sensor signal conditioning stages where BC856BMTF's low-noise performance is explicitly leveraged.
What is the maximum power dissipation of BC856BMTF?
The BC856BMTF has a maximum collector power dissipation (PC) of 310 mW at TA = 25°C in the SOT-23 package. Derating applies above 25°C per the datasheet's thermal resistance curve, and BC856BMTF must be thermally managed in continuous high-current operation to avoid junction overheating.
Is BC856BMTF pin-compatible with other SOT-23 PNP transistors?
BC856BMTF uses standard SOT-23 pinout (1=Base, 2=Emitter, 3=Collector), matching industry conventions for PNP devices. While physical pin alignment is identical, electrical differences-such as VCEO and hFE range-mean functional substitution requires validation; BC856BMTF is not guaranteed drop-in compatible with non-B-grade or non-BC856-series SOT-23 PNPs.
What does the "TF" suffix indicate in BC856BMTF?
The "TF" suffix in BC856BMTF denotes tape-and-reel packaging per EIA-481 standard, with 3000 units per reel. This format is optimized for automated SMT assembly lines and confirms BC856BMTF's suitability for high-volume manufacturing environments requiring consistent feeding and placement accuracy.
BC856BMTF 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:
- 200 @ 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
BC856BMTF FAQ
1.How can I place an order for BC856BMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856BMTF 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 BC856BMTF reliable?
The price and inventory of BC856BMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856BMTF is usually 5 days.
3.What payment methods are accepted for BC856BMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856BMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856BMTF?
BC856BMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856BMTF 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 BC856BMTF?
For technical support, including BC856BMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856BMTF requirements.
6.How does Aetrix verify that BC856BMTF is sourced from the original manufacturer or authorized distributors?
All BC856BMTF 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 BC856BMTF meets industry standards.
7.What is the process for return or replacement of BC856BMTF?
All BC856BMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC856BMTF, 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 BC856BMTF part is unused and in its original packaging.
Return procedure for BC856BMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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