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onsemi BC547BTFR
- Part No.:
- BC547BTFR
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC547BTFR.pdf
- Description:
- TRANS NPN 45V 0.1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,454
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Product details
Overview
BC547BTFR from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor in TO-92 package, rated for 45 V VCEO, 100 mA IC, and 500 mW PC, with hFE range of 200–450 (Class B), used in low-voltage switching and small-signal amplification circuits such as LED drivers, sensor interfaces, and logic-level translators.
For engineers reviewing the BC547BTFR datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, TO-92 terminal mapping, real-world use cases, and two confirmed alternative parts - all aligned to Fairchild/ON Semiconductor's official BC547 family documentation Rev. 1.1.1.
Technical Context
This device operates as a bipolar junction transistor with fixed emitter-base and collector-base junctions optimized for linear amplification and saturated switching. Its DC current gain (hFE) is specified at VCE = 5 V and IC = 2 mA, and saturation behavior is characterized at IC = 10 mA / IB = 0.5 mA and IC = 100 mA / IB = 5 mA.
It features low noise figure (2.0–10.0 dB) across BC546–BC548 variants, though BC547B itself is not classified as low-noise per datasheet; its fT is 300 MHz at VCE = 5 V, IC = 10 mA, enabling RF-capable small-signal operation up to mid-VHF band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in switching applications. |
| IC (DC) | 100 mA - Continuous collector current rating; sets maximum load drive capability in amplifier or switch mode. |
| PC | 500 mW - Total power dissipation at TA = 25°C; requires thermal derating above ambient. |
| hFE (Class B) | 200–450 - Confirmed DC current gain range at VCE = 5 V, IC = 2 mA; enables predictable base drive sizing. |
| VCE(sat) | 90–250 mV @ IC = 10 mA / IB = 0.5 mA - Low saturation voltage ensures minimal conduction loss in switching use. |
| fT | 300 MHz - Current gain-bandwidth product confirms suitability for audio and low-VHF signal amplification. |
Pinout & Package
BC547BTFR uses the standard TO-92 3-lead plastic package with straight leads (JEDEC TO-92 compliant), marked "BC547B" on the case. Lead configuration is fixed: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter (viewed with flat side facing user, leads down).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main output current terminal | Carries load current in common-emitter configuration; connects to positive supply or switched node. |
| 2 (Base) | Control input terminal | Receives bias current to regulate collector current; requires series resistor to limit drive and prevent damage. |
| 3 (Emitter) | Reference/return terminal | Typically grounded or tied to reference potential; forms return path for collector and base currents. |
Key Features
| Feature | Design Value |
|---|---|
| Switching & amplification dual role | Validated by hFE stability and low VCE(sat), enabling reuse across digital logic interface and analog gain stages. |
| TO-92 package compatibility | Standardized footprint supports hand-soldering, prototyping, and legacy PCB designs without adapter. |
| High VCBO = 50 V | Provides margin against transient voltage spikes in inductive load switching (e.g., relays, solenoids). |
| Low VBE(on) = 580–700 mV | Ensures reliable turn-on with microcontroller GPIOs or low-voltage logic outputs without level-shifting. |
Applications
| LED Driver Circuit | Microcontroller Interface |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V MCU GPIO pins. IC Role / Device Role / Timing Role: NPN switch configured in common-emitter mode, sinking current from LED anode to ground. Use Value: VCE(sat) ≤ 250 mV minimizes power loss and heat rise; hFE ≥ 200 allows <10 μA base drive for full saturation. |
Use Scenario: Level translation between 3.3 V logic and 5 V peripheral enable lines. IC Role / Device Role / Timing Role: Active-low open-collector buffer, isolating voltage domains while preserving signal timing integrity. Use Value: fT = 300 MHz ensures sub-10 ns propagation delay; TO-92 layout avoids parasitic capacitance issues. |
| Sensor Signal Amplifier | Relay Control Stage |
Use Scenario: Amplifying low-level analog output from thermistors or photodiodes in battery-powered sensors. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with emitter degeneration for stable gain. Use Value: Noise figure ≤ 10.0 dB at 1 kHz preserves SNR in sub-mV signal paths; IC = 100 mA headroom supports variable bias. |
Use Scenario: Switching 12 V, 50 mA relay coils in industrial control panels. IC Role / Device Role / Timing Role: Saturated switch with flyback diode protection, handling inductive kickback safely. Use Value: VCBO = 50 V exceeds typical relay coil flyback spikes; PC = 500 mW accommodates brief surge dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547BTA | Same die, identical hFE Class B, TO-92 ammo packaging instead of tape-and-reel. | No functional difference; differs only in packaging format and reel compatibility. | Select BC547BTA for manual assembly or low-volume prototyping where tape feed is unnecessary. |
| PN2222A | Higher VCEO = 40 V (vs. 45 V), wider hFE range (100–300), same TO-92 package and pinout. | Marginally lower gain consistency and slightly reduced voltage headroom; validated in legacy industrial schematics. | Choose PN2222A when cross-referencing legacy designs or sourcing from distributors with broader stock depth. |
Compared with BC547BTA, BC547BTFR offers automated SMT placement readiness via tape-and-reel; versus PN2222A, it provides higher guaranteed hFE and superior VCEO margin - critical for reliability in 24 V system interfaces.
Availability
BC547BTFR is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface modules, sensor signal conditioning, and relay control stages requiring stable component supply across production batches and long-lifecycle programs.
Supply support for BC547BTFR 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 (formerly Fairchild Semiconductor) is a global semiconductor supplier specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and consumer markets.
The BC547 series belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for cost-sensitive, high-reliability linear and switching applications in non-critical systems.
FAQ
What is the pin configuration of BC547BTFR?
The BC547BTFR uses the standard TO-92 package with pin 1 as Collector, pin 2 as Base, and pin 3 as Emitter when viewed with the flat side facing the user and leads pointing downward. This configuration is consistent across all BC546–BC550 variants and matches JEDEC TO-92 mechanical specifications.
Is BC547BTFR suitable for switching 12 V relay coils?
Yes, BC547BTFR is suitable for switching 12 V relay coils with up to 50 mA coil current. Its VCEO = 45 V provides ample margin against flyback transients, and its VCE(sat) ≤ 250 mV at IC = 100 mA ensures low power loss. Always pair with a reverse-biased flyback diode across the coil.
What is the hFE range for BC547BTFR?
The BC547BTFR is a Class B device with hFE ranging from 200 to 450 when measured at VCE = 5 V and IC = 2 mA. This gain range is factory-tested and guaranteed per ON Semiconductor's BC546–BC550 datasheet Rev. 1.1.1, enabling accurate base resistor calculation for saturation or linear operation.
Does BC547BTFR have low-noise performance?
No, BC547BTFR is not classified as a low-noise transistor. The BC549 and BC550 variants are explicitly designated for low-noise applications (NF = 1.2–4.0 dB), whereas BC547B has a noise figure of 2.0–10.0 dB - acceptable for general-purpose amplification but not optimized for precision audio or sensor front-ends.
What packaging format does BC547BTFR use?
BC547BTFR is supplied in tape-and-reel packaging (TFR suffix), compatible with automated pick-and-place equipment. Each reel contains standard quantities per ON Semiconductor's ordering specification, supporting high-volume SMT assembly without manual handling or bulk sorting.
BC547BTFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- 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:
- 200 @ 2mA, 5V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC547BTFR FAQ
1.How can I place an order for BC547BTFR through Aetrix?
Please submit a Request for Quotation (RFQ) for BC547BTFR 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 BC547BTFR reliable?
The price and inventory of BC547BTFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547BTFR is usually 5 days.
3.What payment methods are accepted for BC547BTFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547BTFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC547BTFR?
BC547BTFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC547BTFR 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 BC547BTFR?
For technical support, including BC547BTFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547BTFR requirements.
6.How does Aetrix verify that BC547BTFR is sourced from the original manufacturer or authorized distributors?
All BC547BTFR 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 BC547BTFR meets industry standards.
7.What is the process for return or replacement of BC547BTFR?
All BC547BTFR units undergo pre-shipment inspection (PSI). If there is an issue with BC547BTFR, 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 BC547BTFR part is unused and in its original packaging.
Return procedure for BC547BTFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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