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onsemi 2N3904RLRAG
- Part No.:
- 2N3904RLRAG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
2N3904RLRAG.pdf
- Description:
- TRANS NPN 40V 0.2A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
2N3904RLRAG from onsemi is an NPN silicon general-purpose transistor in TO-92 package, rated for 40 VCEO, 200 mA continuous collector current, and 625 mW dissipation at 25°C ambient. It delivers DC current gain (hFE) of 100–300 at IC = 10 mA, VCE = 1.0 V, and supports switching applications with 35 ns rise/fall time and 200 ns storage time. It is widely used in low-power amplification and digital switching circuits.
For engineers reviewing the 2N3904RLRAG datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, TO-92 terminal mapping, real-world use cases in signal conditioning and load control, and two validated alternative transistors with documented functional trade-offs.
Technical Context
The 2N3904RLRAG operates as a standard NPN bipolar junction transistor with fixed-emitter configuration and base-controlled current amplification. Its small-signal characteristics include fT = 300 MHz, Cobo = 4.0 pF, and Cibo = 8.0 pF - enabling stable operation up to mid-VHF frequencies in amplifier and oscillator designs.
It features low saturation voltages (VCE(sat) ≤ 0.3 V at IC = 50 mA, IB = 5 mA) and tight noise performance (NF = 5.0 dB at IC = 100 µA, RS = 1 kΩ), making it suitable for audio preamplifier stages and precision switching where thermal stability and low distortion are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown; defines rail compatibility in 3.3 V/5 V logic-level switching. |
| IC (continuous) | 200 mA - Sustained current-handling capability; supports driving LEDs, relays, and small solenoids directly. |
| hFE @ IC=10 mA | 100–300 - High and consistent DC current gain enables reliable biasing without feedback trimming in discrete amplifier designs. |
| fT | 300 MHz - Unity-gain bandwidth ensures usable gain beyond 10 MHz; suitable for RF detector and wideband preamp stages. |
| VCE(sat) | ≤0.3 V @ IC/IB = 10 - Low saturation voltage minimizes power loss and heat generation in saturated-switch mode. |
| NF | 5.0 dB @ 1 kHz - Low noise figure supports high-fidelity analog signal amplification in microphone and sensor front-ends. |
| RJA | 200 °C/W - Thermal resistance confirms need for heatsinking only above ~300 mW dissipation in still-air conditions. |
Pinout & Package
2N3904RLRAG uses the TO-92 (Case 29-11) through-hole plastic package with bent leads and Pb-free finish. Dimensions conform to JEDEC TO-226 standard: body height ~4.7 mm, lead pitch 1.27 mm, and total length ~4.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink node for majority carriers | Connected to ground or low-impedance return path; sets reference for base-emitter bias and output swing range. |
| 2 (Base) | Control electrode for minority carrier injection | Receives input drive current (typically 1–10% of collector current); requires series resistor to limit IB and prevent thermal runaway. |
| 3 (Collector) | Current source node for amplified output | Connected to positive supply via load; delivers switched or amplified current to downstream circuitry with minimal voltage drop in saturation. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free construction | Complies with RoHS Directive 2011/65/EU; eliminates lead contamination risk during reflow and end-of-life recycling. |
| High fT / low Cobo | 300 MHz gain-bandwidth with only 4.0 pF output capacitance enables stable high-frequency amplification without neutralization. |
| Low VCE(sat) and VBE(sat) | 0.3 V and 0.95 V respectively at IC = 50 mA ensure >90% efficiency in saturated switch operation at 5 V rails. |
| Wide TJ range | −55°C to +150°C junction temperature rating supports deployment in automotive under-hood and industrial control environments. |
| Consistent hFE spread | Min 100 / Max 300 at IC = 10 mA allows predictable gain-setting in production without binning or trim resistors. |
Applications
| Audio Pre-amplifier 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 operating in common-emitter configuration with emitter degeneration. Use Value: 5.0 dB noise figure and 300 MHz fT preserve signal integrity across 20 Hz–20 kHz while enabling compact PCB layout with no external compensation. |
Use Scenario: Driving LED indicators, small relays, or MOSFET gates from 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: Digital switch configured in common-emitter saturation mode with base current limited by MCU output impedance. Use Value: 0.3 V VCE(sat) ensures <15 mW power loss at 50 mA load, eliminating need for active cooling in space-constrained embedded modules. |
| DC-DC Converter Feedback | Industrial Sensor Interface |
|
Use Scenario: Level-shifting and isolating error amplifier output in isolated flyback or forward converter feedback loops. IC Role / Device Role / Timing Role: Linear-mode current mirror or optocoupler driver providing galvanic isolation between primary and secondary sides. Use Value: 40 V VCBO withstands transient spikes on secondary-side bias windings; 200 mA IC supports fast optocoupler turn-on for <1 µs response. |
Use Scenario: Converting 4–20 mA loop signals into voltage for analog input conditioning in PLC I/O modules. IC Role / Device Role / Timing Role: Transimpedance amplifier stage converting loop current to proportional voltage using emitter-degenerated topology. Use Value: Stable hFE over −40°C to +85°C ensures <±1% gain drift across industrial temperature range without calibration. |
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 |
|---|---|---|---|
| BC547B | Lower VCEO (45 V), higher hFE min (200), same TO-92 package but different pinout (E-B-C vs B-E-C). | Not pin-compatible; requires PCB layout revision. Better for low-noise linear amps but less robust against 40 V transients. | Select BC547B only when redesigning for improved gain consistency and lower noise, not as drop-in replacement. |
| MPS2222A | Higher IC (600 mA), same VCEO (40 V), identical pinout (B-E-C), but larger package (TO-92 variant with wider body). | Same footprint compatibility; superior current drive for relay coils or higher-power LEDs, but increased thermal mass slows switching slightly. | Choose MPS2222A when upgrading drive capability without changing board layout - verify mechanical clearance for taller TO-92 variant. |
Compared with BC547B and MPS2222A, the 2N3904RLRAG offers optimal balance of noise, gain, and switching speed in its class, with guaranteed Pb-free compliance and tighter hFE distribution - making it preferred for cost-sensitive, high-volume consumer and industrial signal-path designs where layout reuse is critical.
Availability
2N3904RLRAG is available at Aetrix Electronics and suitable for audio signal conditioning, microcontroller peripheral interfacing, and industrial sensor signal conversion requiring stable component supply and long-term manufacturing continuity.
Supply support for 2N3904RLRAG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The 2N3904RLRAG belongs to onsemi's legacy general-purpose transistor product line, designed for broad adoption in discrete amplifier, switching, and interface circuits where reliability, consistency, and regulatory compliance are essential.
FAQ
What is the maximum collector-emitter voltage rating for the 2N3904RLRAG?
The 2N3904RLRAG has a maximum collector-emitter voltage (VCEO) rating of 40 Vdc. This value is tested under specified conditions (IC = 1.0 mA, IB = 0) and represents the highest voltage that can be applied between collector and emitter while keeping the transistor in the off state without risking breakdown. Exceeding this rating may cause permanent damage.
Is the 2N3904RLRAG pin-compatible with other TO-92 NPN transistors like the BC547?
No, the 2N3904RLRAG is not pin-compatible with BC547-series transistors. While both use TO-92 packages, the 2N3904RLRAG follows Style 2 pinout (Base–Emitter–Collector), whereas BC547 uses Style 1 (Emitter–Base–Collector). Swapping them without PCB modification will result in incorrect biasing and circuit failure.
Does the 2N3904RLRAG meet RoHS requirements?
Yes, the 2N3904RLRAG is explicitly marked as Pb-free in onsemi's ordering information and complies with the EU RoHS Directive 2011/65/EU. The "G" suffix in the part number denotes RoHS-compliant packaging, confirmed in the datasheet's Marking Diagrams and Ordering Information sections.
What is the typical DC current gain (hFE) of the 2N3904RLRAG at 10 mA collector current?
The 2N3904RLRAG exhibits a DC current gain (hFE) ranging from 100 to 300 when tested at IC = 10 mA and VCE = 1.0 Vdc. This specification is guaranteed per onsemi's Electrical Characteristics table and reflects the device's ability to amplify base current into collector current under standard linear operating conditions.
Can the 2N3904RLRAG be used in high-frequency amplifier designs?
Yes, the 2N3904RLRAG supports high-frequency amplifier designs with a current-gain bandwidth product (fT) of 300 MHz at IC = 10 mA and VCE = 20 Vdc. Its low output capacitance (Cobo = 4.0 pF) and input capacitance (Cibo = 8.0 pF) further enable stable operation up to VHF bands when properly biased and matched.
2N3904RLRAG 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):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- 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)
2N3904RLRAG FAQ
1.How can I place an order for 2N3904RLRAG through Aetrix?
Please submit a Request for Quotation (RFQ) for 2N3904RLRAG 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 2N3904RLRAG reliable?
The price and inventory of 2N3904RLRAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N3904RLRAG is usually 5 days.
3.What payment methods are accepted for 2N3904RLRAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N3904RLRAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2N3904RLRAG?
2N3904RLRAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2N3904RLRAG 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 2N3904RLRAG?
For technical support, including 2N3904RLRAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N3904RLRAG requirements.
6.How does Aetrix verify that 2N3904RLRAG is sourced from the original manufacturer or authorized distributors?
All 2N3904RLRAG 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 2N3904RLRAG meets industry standards.
7.What is the process for return or replacement of 2N3904RLRAG?
All 2N3904RLRAG units undergo pre-shipment inspection (PSI). If there is an issue with 2N3904RLRAG, 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 2N3904RLRAG part is unused and in its original packaging.
Return procedure for 2N3904RLRAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2N3904RLRAG Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
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MMBT3906-7-F
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
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MMBTA06LT1G
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MMBT2222ALT1G
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