My Inquiry
My Account
onsemi BC547ARL1
- Part No.:
- BC547ARL1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC547ARL1.pdf
- Description:
- TRANS NPN 45V 0.1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:9,441
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC547ARL1 from ON Semiconductor is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for VCEO = 45 V, IC = 100 mA, and PD = 625 mW at TA = 25°C, with hFE = 110–220 (IC = 2 mA, VCE = 5 V), used in low-power linear amplification and switching circuits in consumer audio and signal conditioning stages.
For engineers reviewing the BC547ARL1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical ratings, thermal behavior, small-signal gain-bandwidth (fT = 150–300 MHz), saturation voltage performance (VCE(sat) ≤ 0.25 V at IC/IB = 10), and TO-92 terminal mapping to support schematic validation, PCB layout, and functional replacement decisions.
Technical Context
The BC547ARL1 operates as a discrete bipolar junction transistor optimized for medium-gain, low-noise amplification and reliable switching in ambient-temperature-stable designs. Its hFE range (110–220) and fT of 150–300 MHz enable stable mid-frequency signal amplification up to ~100 kHz with minimal distortion, while VBE(on) = 0.55–0.77 V ensures predictable base drive requirements.
Thermal resistance RJA = 200°C/W and RJC = 83.3°C/W define its power handling limits under natural convection; derating begins above 25°C at 5.0 mW/°C. The device supports continuous operation from −55°C to +150°C junction temperature, with Cobo = 1.7–4.5 pF and NF = 2.0 dB (IC = 0.2 mA, f = 1 kHz), confirming suitability for low-noise preamplifier stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; sets safe operating voltage headroom in 24–36 V supply rails. |
| IC (max) | 100 mA - Continuous collector current limit; defines maximum load drive capability in switching or Class-A amplifier stages. |
| hFE | 110–220 @ IC = 2 mA - DC current gain range determines required base bias network precision and stability margin. |
| fT | 150–300 MHz - Transition frequency confirms usable bandwidth up to ~100 kHz with adequate gain margin for audio and sensor signal paths. |
| VCE(sat) | ≤ 0.25 V @ IC/IB = 10 - Low saturation voltage minimizes power loss and heating in digital logic interface or relay driver applications. |
| NF | 2.0 dB @ IC = 0.2 mA - Noise figure enables use in low-level analog front-ends where signal integrity is critical. |
| RJA | 200°C/W - Junction-to-ambient thermal resistance governs heatsinking needs in enclosed or high-ambient environments. |
Pinout & Package
BC547ARL1 uses the standard TO-92 (Case 29, Style 17) through-hole plastic package with 3 leads, designed for manual or wave-solder assembly. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - confirmed by ON Semiconductor marking diagram and mechanical drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main output current path | Connected to load or next stage; must withstand full VCEO and dissipate heat via PCB copper pour or heatsink tab. |
| 2 (Base) | Control input node | Receives current-limited bias; requires series resistor to set IB and prevent thermal runaway during saturation. |
| 3 (Emitter) | Reference and return path | Typically grounded or tied to emitter degeneration resistor; establishes DC operating point and AC signal reference. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free (RoHS-compliant) packaging | BC547ARL1G variant available; BC547ARL1 meets lead-free soldering standards without requiring process requalification. |
| Low noise figure (2.0 dB) | Enables use in microphone preamps and sensor signal chains where SNR degradation must be minimized below 1 kHz. |
| High fT (up to 300 MHz) | Supports stable gain in wideband amplifiers and RF detector stages up to VHF edge without oscillation risk. |
| Controlled hFE binning (A grade) | Guarantees minimum hFE = 110, reducing variation in bias point across production batches for consistent circuit performance. |
| TO-92 tape-and-reel (2000 pcs) | Enables automated pick-and-place assembly; eliminates manual handling and improves traceability in volume manufacturing. |
Applications
| Audio Pre-amplifier Stage | Microcontroller GPIO Interface |
|---|---|
|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling in portable audio devices. IC Role / Device Role / Timing Role: Discrete NPN transconductance amplifier providing 20–40 dB voltage gain with minimal added noise. Use Value: Achieves ≥60 dB SNR at 1 kHz using only one BC547ARL1 stage due to 2.0 dB NF and stable hFE over temperature. |
Use Scenario: Level-shifting and current boosting between 3.3 V microcontroller outputs and 5 V/12 V peripheral loads (e.g., LEDs, relays, optocouplers). IC Role / Device Role / Timing Role: General-purpose switch with fast turn-on (ton < 100 ns) and low VCE(sat) for clean digital transitions. Use Value: Delivers 100 mA sink/source capability with ≤0.25 V dropout, enabling direct drive of 5 V logic inputs without external level translators. |
| Linear Voltage Regulator Pass Element | Industrial Sensor Signal Conditioning |
|
Use Scenario: Acting as the series pass transistor in adjustable low-dropout regulators powering analog sensor subsystems. IC Role / Device Role / Timing Role: Current-controlled linear regulator element with thermally stable VBE and low thermal resistance (RJC = 83.3°C/W). Use Value: Maintains ±1% output regulation over 0–70°C ambient when paired with LM317 feedback network and 1 cm² copper pour. |
Use Scenario: Amplifying millivolt-level outputs from RTDs, thermocouples, or strain gauges in factory automation modules. IC Role / Device Role / Timing Role: First-stage non-inverting amplifier with emitter-follower configuration for high input impedance and low output impedance. Use Value: Provides >10 MΩ input impedance and <100 Ω output impedance while maintaining linearity error <0.5% over 0–100°C sensor range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547BRL1 | Higher hFE range (200–450 vs. 110–220); same VCEO, IC, package, and pinout. | Better suited for high-gain, low-base-current bias networks; may require recalculating RB to avoid overdrive. | Select BC547BRL1 when circuit demands higher current gain stability at low IC (<1 mA) or improved β consistency across temperature. |
| 2N3904RL1 | Lower VCEO (40 V vs. 45 V); identical TO-92 package and pinout; hFE = 100–300; fT = 300 MHz. | Marginally lower voltage rating limits use in 42 V automotive subsystems; otherwise interchangeable in 24 V industrial controls. | Choose 2N3904RL1 for cost-sensitive designs where 40 V headroom suffices and higher fT is prioritized over noise performance. |
Compared with BC547BRL1 and 2N3904RL1, the BC547ARL1 offers the lowest noise (2.0 dB) and tightest hFE binning among TO-92 NPNs in its class-making it optimal for precision analog front-ends where gain predictability and SNR outweigh raw bandwidth or voltage margin.
Availability
BC547ARL1 is available at Aetrix Electronics and suitable for audio pre-amplification, microcontroller interface buffering, and industrial sensor signal conditioning requiring stable component supply, RoHS compliance, and tape-and-reel delivery for SMT-compatible through-hole assembly.
Supply support for BC547ARL1 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The BC547ARL1 belongs to the BC546/547/548 family of general-purpose NPN transistors engineered for reliability, consistency, and ease of integration in cost-sensitive linear and switching applications across consumer, industrial, and communications equipment.
FAQ
What is the maximum collector-emitter voltage rating for BC547ARL1?
The BC547ARL1 has a maximum collector-emitter voltage (VCEO) rating of 45 VDC, verified per ON Semiconductor's BC546/D datasheet Rev. 5. This rating applies under open-base conditions at TA = 25°C and defines the absolute upper limit before avalanche breakdown occurs. Exceeding this voltage risks permanent device failure, so design margins should maintain ≤36 V in 45 V-rated systems.
Does BC547ARL1 have a Pb-free option?
Yes, the Pb-free variant is designated BC547ARL1G and shares identical electrical specifications, TO-92 package dimensions, and tape-and-reel packaging (2000 pcs/reel) with BC547ARL1. Both comply with RoHS Directive 2011/65/EU, and the "G" suffix indicates lead-free terminations compatible with standard reflow profiles per J-STD-020.
What is the typical DC current gain (hFE) of BC547ARL1 at 2 mA collector current?
The BC547ARL1 exhibits hFE = 110–220 when tested at IC = 2 mA and VCE = 5 V, per the "ELECTRICAL CHARACTERISTICS" table in the official datasheet. This A-grade binning ensures minimum gain of 110, supporting predictable bias point design in amplifier and switching circuits without requiring gain compensation networks.
Can BC547ARL1 replace BC547B in existing designs?
BC547ARL1 can replace BC547B only if the circuit tolerates lower hFE (110–220 vs. 200–450) and does not rely on the higher gain for stability. Since both share identical VCEO, IC, package, and pinout, no PCB changes are needed-but base resistor values may require adjustment to maintain target IC and avoid thermal drift in high-temperature operation.
What is the thermal resistance junction-to-ambient (RJA) for BC547ARL1?
The BC547ARL1 has a specified RJA of 200°C/W under natural convection conditions on FR-4 PCB with minimal copper area, as stated in the "THERMAL CHARACTERISTICS" section of the datasheet. This value drops significantly with added copper pour; for example, 1 cm² of 2 oz copper reduces RJA to ~120°C/W, extending safe continuous power dissipation beyond the nominal 625 mW limit.
BC547ARL1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, 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:
- 250mV @ 500µA, 10mA
- Current - Collector Cutoff (Max):
- 15nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 110 @ 2mA, 5V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
BC547ARL1 FAQ
1.How can I place an order for BC547ARL1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC547ARL1 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 BC547ARL1 reliable?
The price and inventory of BC547ARL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547ARL1 is usually 5 days.
3.What payment methods are accepted for BC547ARL1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547ARL1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC547ARL1?
BC547ARL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC547ARL1 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 BC547ARL1?
For technical support, including BC547ARL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547ARL1 requirements.
6.How does Aetrix verify that BC547ARL1 is sourced from the original manufacturer or authorized distributors?
All BC547ARL1 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 BC547ARL1 meets industry standards.
7.What is the process for return or replacement of BC547ARL1?
All BC547ARL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC547ARL1, 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 BC547ARL1 part is unused and in its original packaging.
Return procedure for BC547ARL1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC547ARL1 Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
