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onsemi BC547TAR
- Part No.:
- BC547TAR
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC547TAR.pdf
- Description:
- TRANS NPN 45V 0.1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,037
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Product details
Overview
BC547TAR from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor used for low-power switching and amplification in discrete analog circuits. It features VCEO = 45 V, IC = 100 mA, PC = 500 mW, hFE = 200–450 (Class B), and TO-92 package - commonly deployed in signal conditioning stages of sensor interfaces and power supply control logic.
For engineers reviewing the BC547TAR datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain tolerance, saturation voltage at defined IB/IC conditions, noise figure in audio preamp use, and thermal derating behavior in ambient-constrained PCB layouts.
Technical Context
This device operates as a single-element bipolar junction transistor with fixed emitter-base-collector terminal assignment and no integrated biasing or protection circuitry. Its performance is defined by DC current gain (hFE) across collector currents from 2 mA to 100 mA, and saturation characteristics validated at IC = 10 mA / IB = 0.5 mA and IC = 100 mA / IB = 5 mA.
The BC547TAR belongs to the BC546–BC550 family sharing identical TO-92 mechanical form factor and absolute maximum ratings except for VCBO and VCEO, where BC547 is rated at 50 V and 45 V respectively - distinguishing it from BC546 (80 V / 65 V) and BC548 (30 V / 30 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum allowable collector-emitter voltage before breakdown; sets upper rail limit for switch-mode operation in 24–36 V systems. |
| IC (DC) | 100 mA - Continuous collector current rating; defines max load drive capability without thermal runaway at TA ≤ 25°C. |
| hFE (Class B) | 200–450 - DC current gain range at VCE = 5 V, IC = 2 mA; determines base drive sizing for predictable saturation in digital logic interfacing. |
| VCE(sat) | 90–250 mV @ IC = 10 mA / IB = 0.5 mA - Low saturation voltage enables efficient low-side switching with <100 mW conduction loss. |
| fT | 300 MHz - Current gain bandwidth product at VCE = 5 V, IC = 10 mA; supports small-signal amplification up to VHF band edge. |
| NF | 2.0–10.0 dB @ f = 1 kHz - Noise figure range confirms suitability for low-noise preamplifier stages in audio and instrumentation front-ends. |
Pinout & Package
BC547TAR uses the standard TO-92 3-lead plastic package with straight lead configuration per JEDEC TO-92. Lead spacing is 0.2 inch (5.08 mm); body dimensions are 4.7 mm × 3.7 mm × 4.6 mm (L × W × H). The device is marked "BC547B" on the package face.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Top View, Flat Side Up) | Collector | Main current sink node; connects to load or higher-potential rail in common-emitter configurations. |
| 2 (Center) | Base | Control input requiring current-limited drive; typical IB = IC/hFE for linear operation or ≥ IC/10 for forced saturation. |
| 3 (Bottom) | Emitter | Current source node tied to reference (usually ground); provides return path and establishes VBE bias point. |
Key Features
| Feature | Design Value |
|---|---|
| Switching & amplification dual-use | Validated hFE stability and low VCE(sat) support both saturated switching and Class-A linear gain modes without redesign. |
| TO-92 mechanical compatibility | Standardized footprint enables drop-in replacement across BC546–BC550 series and legacy Fairchild/ON Semi equivalents. |
| Low-noise performance | 2.0–10.0 dB noise figure at 1 kHz allows use in microphone preamps and sensor signal chains where SNR > 60 dB is required. |
| Thermal robustness | 150°C max junction temperature and 500 mW power dissipation permit operation in sealed enclosures up to +70°C ambient. |
Applications
| Audio Preamp Stage | Microcontroller GPIO Driver |
|---|---|
|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN transconductance amplifier in common-emitter configuration with emitter degeneration. Use Value: 200–450 hFE ensures stable gain over production lot; 2.0–10.0 dB NF preserves signal integrity in sub-10 mVpp inputs. |
Use Scenario: Level-shifting and current boosting for 3.3 V MCU outputs driving 12 V relays or LED arrays. IC Role / Device Role / Timing Role: Low-side switch with base driven directly from microcontroller I/O pin through current-limiting resistor. Use Value: 90–250 mV VCE(sat) minimizes power loss; 100 mA IC rating supports typical relay coils (≤70 mA) with margin. |
| Power Supply Enable Control | Industrial Sensor Interface |
|
Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V rails via microcontroller command in multi-rail embedded systems. IC Role / Device Role / Timing Role: High-side or low-side pass transistor controlled by enable logic signal. Use Value: 45 V VCEO accommodates input rails up to 36 V; 500 mW PC allows continuous duty at 100 mA without heatsink. |
Use Scenario: Conditioning analog output from RTD, thermistor, or pressure transducers before transmission to PLC analog inputs. IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-impedance drive and isolation between sensor and long cable runs. Use Value: Stable hFE and low Cob (3.5–6.0 pF) prevent phase shift in 0–10 kHz measurement bandwidths. |
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 electrical specs, TO-92 ammo packaging; differs only in packing method (ammo vs. tape-and-reel). | No functional difference; selected when automated pick-and-place requires tape-and-reel format. | Choose BC547TAR for reel-fed SMT lines; BC547BTA for manual or bulk-handling assembly. |
| PN2222A | Higher VCEO (40 V vs. 45 V), lower hFE min (100 vs. 200), same TO-92 package; not pin-compatible due to different pinout (E-B-C vs. C-B-E). | Not suitable as direct replacement without PCB layout change; acceptable only in new designs where pinout can be adapted. | Select PN2222A only if higher VCBO (75 V) or proven field reliability in high-temp industrial environments is prioritized over gain consistency. |
Compared with BC547BTA, BC547TAR offers identical electrical behavior but optimized for automated assembly; versus PN2222A, BC547TAR delivers higher guaranteed hFE and correct pinout for legacy BC-series layouts, reducing validation effort in cost-sensitive consumer electronics.
Availability
BC547TAR is available at Aetrix Electronics and suitable for audio preamplifiers, microcontroller interface circuits, and industrial sensor signal conditioning requiring stable component supply across production volumes.
Supply support for BC547TAR 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 management, analog, and discrete components for automotive, industrial, and consumer markets.
The BC547TAR belongs to ON Semiconductor's legacy general-purpose transistor product line, designed for cost-sensitive, high-volume applications demanding reliability, consistent parametric distribution, and broad second-source availability.
FAQ
What is the pin configuration of BC547TAR?
The BC547TAR uses the standard TO-92 package with Collector (pin 1), Base (pin 2), and Emitter (pin 3) in top-view orientation with flat side facing up. This C-B-E arrangement matches all BC546–BC550 variants and is distinct from PN2222A's E-B-C order. Confirming pinout before PCB layout is essential, as miswiring causes immediate failure. BC547TAR's pinout is documented in Figure 7 of the ON Semiconductor datasheet.
What does the 'TAR' suffix indicate in BC547TAR?
The 'TAR' suffix denotes tape-and-reel packaging per EIA-481 standard, with 2,000 units per reel - optimized for automated SMT placement. It corresponds electrically and mechanically to the BC547B grade (hFE = 200–450), and shares identical absolute maximum ratings and thermal characteristics as other BC547 variants. BC547TAR is not a separate silicon variant but a packaging option.
Can BC547TAR replace BC547BTA in existing designs?
Yes, BC547TAR can directly replace BC547BTA in existing designs because both share identical die, electrical specifications, TO-92 package outline, and pinout. The only difference is packaging format: BC547TAR is supplied on tape-and-reel for pick-and-place machines, while BC547BTA uses ammo packaging. No schematic or layout changes are needed when switching between these two part numbers.
What is the maximum operating temperature for BC547TAR?
The BC547TAR has a maximum junction temperature (TJ) of 150°C and a storage temperature range of –65°C to +150°C. At ambient temperatures above 50°C, derating is required: power dissipation must be reduced linearly from 500 mW at 25°C to zero at 150°C. For reliable long-term operation in enclosed industrial enclosures, keep board-level ambient below 70°C with adequate copper pour for heat spreading.
Is BC547TAR suitable for audio amplifier applications?
Yes, BC547TAR is suitable for low-noise audio amplifier applications such as microphone preamplifiers and tone control stages. Its noise figure of 2.0–10.0 dB at 1 kHz and stable hFE across 2 mA–10 mA collector currents support clean small-signal amplification. However, it is not recommended for high-power output stages due to its 500 mW power limit and lack of built-in thermal shutdown.
BC547TAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- 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:
- 110 @ 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
BC547TAR FAQ
1.How can I place an order for BC547TAR through Aetrix?
Please submit a Request for Quotation (RFQ) for BC547TAR 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 BC547TAR reliable?
The price and inventory of BC547TAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547TAR is usually 5 days.
3.What payment methods are accepted for BC547TAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547TAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC547TAR?
BC547TAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC547TAR 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 BC547TAR?
For technical support, including BC547TAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547TAR requirements.
6.How does Aetrix verify that BC547TAR is sourced from the original manufacturer or authorized distributors?
All BC547TAR 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 BC547TAR meets industry standards.
7.What is the process for return or replacement of BC547TAR?
All BC547TAR units undergo pre-shipment inspection (PSI). If there is an issue with BC547TAR, 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 BC547TAR part is unused and in its original packaging.
Return procedure for BC547TAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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