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onsemi 2SC4081RT1
- Part No.:
- 2SC4081RT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
2SC4081RT1.pdf
- Description:
- TRANS NPN 50V 0.1A SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,472
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Product details
Overview
2SC4081RT1 from onsemi is an NPN general-purpose amplifier transistor in SC−70 (SOT−323) surface-mount package, rated for V(BR)CEO = 50 Vdc, IC = 100 mAdc continuous, hFE = 180–390 at IC = 2.0 mAdc, VCE(sat) ≤ 0.5 Vdc, and PD = 200 mW - used in low-power audio preamplifier stages and signal switching circuits.
For engineers reviewing the 2SC4081RT1 datasheet, pinout, applications, or equivalent options, key selection considerations include its SC−70 footprint compatibility, moisture sensitivity level 1 handling, Pb−free availability (2SC4081RT1G), and verified hFE range under standard bias conditions.
Technical Context
This NPN bipolar junction transistor operates in linear amplification and switching modes with defined breakdown limits: V(BR)CBO = 60 Vdc ensures robust collector-base isolation, while V(BR)EBO = 7.0 Vdc constrains base-emitter reverse bias. Its thermal rating supports operation up to TJ = 150°C with Tstg = −55 to +150°C storage range.
The device exhibits low leakage: ICBO ≤ 0.1 A and ICEO ≤ 0.1 A at VCE = 10 Vdc, confirming stable cutoff behavior. Pulse-tested saturation performance (VCE(sat) ≤ 0.5 Vdc at IC = 100 mAdc/IB = 10 mAdc) enables efficient low-voltage switching in compact analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V(BR)CEO | 50 Vdc - maximum safe collector-emitter voltage before avalanche breakdown |
| IC (continuous) | 100 mAdc - usable DC collector current without thermal derating at TA = 25°C |
| hFE | 180–390 - guaranteed DC current gain range at VCE = 6.0 Vdc, IC = 2.0 mAdc |
| VCE(sat) | ≤ 0.5 Vdc - low saturation voltage enabling <0.05 W power loss at 100 mA switching |
| PD | 200 mW - maximum dissipation in SC−70 package with no heatsink required |
| MSL Level | Level 1 - no floor life limitation; safe for standard SMT reflow without dry-baking |
Pinout & Package
Package: SC−70 (SOT−323), 3-pin surface-mount plastic case (Case 419), 1.25 mm × 0.85 mm footprint, 0.95 mm height, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control electrode; requires ~10 mA drive for full saturation at 100 mA collector load |
| 2 | Emitter | Current return path; tied to ground or low-impedance reference in common-emitter configurations |
| 3 | Collector | Output terminal; connects to load or next stage; handles up to 50 Vdc potential swing |
Key Features
| Feature | Design Value |
|---|---|
| Moisture Sensitivity Level 1 | Eliminates need for dry-packaging or baking prior to reflow soldering |
| Pb−Free Package Option | 2SC4081RT1G variant available with RoHS-compliant termination finish |
| Guaranteed hFE Range | 180–390 ensures predictable small-signal gain without binning in production |
| Low VCE(sat) | ≤ 0.5 Vdc minimizes voltage drop and heat generation in switching applications |
Applications
| Audio Preamp Stage | Signal Switching |
|---|---|
Use Scenario: Low-noise voltage amplification of microphone or sensor outputs in portable audio devices. IC Role / Device Role / Timing Role: NPN amplifier in common-emitter configuration with emitter degeneration resistor. Use Value: Stable hFE range and low VCE(sat) preserve signal headroom and reduce distortion at battery-limited supply voltages. | Use Scenario: Digital logic-level translation and relay driver control in microcontroller I/O expansion. IC Role / Device Role / Timing Role: Saturated switch turning on/off 24 V solenoids or LED arrays via microcontroller GPIO. Use Value: Verified IC(P) = 200 mAdc peak and MSL Level 1 support reliable high-volume automated assembly. |
| DC Power Monitor | Temperature Sensor Interface |
Use Scenario: Current-sense amplifier input stage measuring load current in 5 V embedded power rails. IC Role / Device Role / Timing Role: Transconductance amplifier converting shunt voltage to amplified output for ADC input. Use Value: V(BR)CEO = 50 Vdc and ICEO ≤ 0.1 A ensure accuracy and stability across rail variations and temperature drift. | Use Scenario: Linearized interface between silicon bandgap temperature sensors and analog front-end circuitry. IC Role / Device Role / Timing Role: Active load or gain-setting element in ratiometric sensor conditioning networks. Use Value: Tight hFE tolerance and low ICBO support repeatable calibration over −40°C to +85°C operating 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 |
|---|---|---|---|
| BC847B,115 (Nexperia) | Same SC−70 package; hFE = 200–450 at IC = 10 mA; V(BR)CEO = 45 Vdc | Slightly lower breakdown margin; optimized for higher-speed switching | Select when faster turn-off (tf = 300 ns) and tighter hFE binning are prioritized over 50 Vdc margin |
| MMBT3904LT1G (onsemi) | Same manufacturer; SC−70; V(BR)CEO = 40 Vdc; hFE = 100–300 at IC = 10 mA | Lower voltage rating and narrower hFE range; wider industry adoption | Choose for legacy design continuity where 40 Vdc ceiling is sufficient and cost sensitivity is high |
Compared with BC847B,115 and MMBT3904LT1G, the 2SC4081RT1 provides superior V(BR)CEO margin (50 Vdc) and higher minimum hFE (180), making it preferable for designs requiring robustness against transient overvoltage and consistent small-signal gain at low collector currents.
Availability
2SC4081RT1 is available at Aetrix Electronics and suitable for audio preamplifier stages, signal switching circuits, and DC power monitoring applications requiring stable component supply, moisture-insensitive packaging, and verified hFE performance.
Supply support for 2SC4081RT1 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 focused on energy-efficient electronics, delivering discrete, analog, and logic solutions for automotive, industrial, and cloud power systems.
The 2SC4081RT1 belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, space-constrained analog signal conditioning and low-power switching in consumer and industrial equipment.
FAQ
What is the maximum collector-emitter voltage rating for the 2SC4081RT1?
The 2SC4081RT1 has a guaranteed minimum collector-emitter breakdown voltage V(BR)CEO of 50 Vdc at IC = 2.0 mAdc and IB = 0. This rating defines the absolute upper limit for safe DC operation in common-emitter configurations without risking avalanche conduction. Exceeding this voltage may cause irreversible device failure.
Does the 2SC4081RT1 have a Pb−free version?
Yes, the 2SC4081RT1G is the official Pb−free variant of the 2SC4081RT1, offered in the same SC−70 package with identical electrical specifications and RoHS-compliant termination. The "G" suffix explicitly denotes compliance with lead-free soldering standards and environmental regulations.
What is the pin configuration of the 2SC4081RT1 in the SC−70 package?
The 2SC4081RT1 uses Style 7 pinout in SC−70: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This arrangement is confirmed in the mechanical case outline diagram (Case 419) and matches standard SOT−323 orientation for NPN transistors in onsemi's documentation.
What is the DC current gain (hFE) range for the 2SC4081RT1 under standard test conditions?
The 2SC4081RT1 exhibits a guaranteed hFE range of 180 to 390 when measured at VCE = 6.0 Vdc and IC = 2.0 mAdc, TA = 25°C. This specification ensures predictable small-signal amplification performance across production lots without requiring post-manufacturing sorting.
Is the 2SC4081RT1 suitable for surface-mount reflow assembly without dry-baking?
Yes, the 2SC4081RT1 is rated Moisture Sensitivity Level 1 (MSL Level 1), meaning it can be subjected to standard JEDEC J-STD-020 reflow profiles without prior dry-baking or special handling. This eliminates process steps and reduces manufacturing risk in high-volume SMT lines.
2SC4081RT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 180 @ 2mA, 6V
- Power - Max:
- 200 mW
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
2SC4081RT1 FAQ
1.How can I place an order for 2SC4081RT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SC4081RT1 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 2SC4081RT1 reliable?
The price and inventory of 2SC4081RT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC4081RT1 is usually 5 days.
3.What payment methods are accepted for 2SC4081RT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC4081RT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SC4081RT1?
2SC4081RT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SC4081RT1 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 2SC4081RT1?
For technical support, including 2SC4081RT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC4081RT1 requirements.
6.How does Aetrix verify that 2SC4081RT1 is sourced from the original manufacturer or authorized distributors?
All 2SC4081RT1 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 2SC4081RT1 meets industry standards.
7.What is the process for return or replacement of 2SC4081RT1?
All 2SC4081RT1 units undergo pre-shipment inspection (PSI). If there is an issue with 2SC4081RT1, 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 2SC4081RT1 part is unused and in its original packaging.
Return procedure for 2SC4081RT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2SC4081RT1 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
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