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STMicroelectronics TL081CN
- Part No.:
- TL081CN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL081CN.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,216
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Product details
Overview
TL081CN from STMicroelectronics is a general-purpose JFET-input single operational amplifier optimized for high-speed analog signal conditioning in industrial and consumer systems. It delivers 16 V/µs typical slew rate, ±11 V input common-mode range (with ±15 V supply), 10¹² Ω input impedance, and 2.5–4 MHz gain-bandwidth product - enabling precision AC-coupled amplification, active filtering, and oscillator circuits in 0°C to +70°C environments.
For engineers reviewing the TL081CN datasheet, TL081CN pinout, TL081CN application, or TL081CN equivalent, key selection criteria include input bias current (≤20 nA typ), offset voltage drift (10 µV/°C), output short-circuit protection, and DIP8 package compatibility with legacy through-hole PCB layouts.
Technical Context
The TL081CN uses a monolithic bipolar-JFET process to integrate matched high-voltage JFET inputs with bipolar output stages, achieving low input bias current without sacrificing slew rate or drive capability. Its internal frequency compensation ensures unity-gain stability across load capacitances up to 100 pF.
Designed for dual-supply operation (±6 V to ±18 V), it supports rail-to-rail input common-mode range (up to VCC±) and delivers ±12 V output swing into 2 kΩ at ±15 V supply. The device includes dedicated offset null pins (1 and 5) for precision DC-coupled configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 16 V/µs typical - enables faithful reproduction of fast-rising signals up to ~1 MHz in unity-gain buffer configurations. |
| Input Bias Current | 20 nA max at +25°C - minimizes DC error in high-impedance sensor interfaces and integrator circuits. |
| Input Offset Voltage | 3 mV max (TL081C grade) - supports accurate DC amplification without external trimming in non-critical applications. |
| Gain-Bandwidth Product | 2.5–4 MHz - defines usable small-signal bandwidth for closed-loop gains ≥10 with stable phase margin (45°). |
| Common-Mode Rejection | 70 dB min - suppresses power supply noise and ground bounce in single-supply derived dual-rail systems. |
| Supply Voltage Range | ±6 V to ±18 V - accommodates standard ±12 V and ±15 V analog rails while maintaining specified performance. |
| Output Short-Circuit Duration | Infinite - allows safe operation during transient overloads without latch-up or permanent damage. |
Pinout & Package
TL081CN is supplied in an 8-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is offset-null input 1; Pin 5 is offset-null input 2; Pin 8 is no-connect (N.C.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external 100 Ω potentiometer for fine-tuning input offset voltage. |
| 2 | Inverting Input | Primary feedback node in inverting amplifier configurations; accepts negative-phase signal input. |
| 3 | Non-inverting Input | Reference input for follower, summing, or differential configurations; high-impedance JFET node. |
| 4 | VCC− | Negative supply rail connection; must be referenced to system ground when using split supplies. |
| 5 | Offset Null 2 | Connects to opposite end of same potentiometer as Pin 1 to balance input stage mismatch. |
| 6 | Output | Class-AB push-pull output capable of ±12 V swing into 2 kΩ with <0.01% THD at 1 kHz. |
| 7 | VCC+ | Positive supply rail connection; establishes upper operating voltage limit and output headroom. |
| 8 | N.C. | No internal connection; left unconnected per STMicroelectronics design - not used for thermal or shielding. |
Key Features
| Feature | Design Value |
|---|---|
| High Input Impedance | 10¹² Ω JFET input stage reduces loading on high-Z sources like piezoelectric sensors or RC networks. |
| Internal Frequency Compensation | Guarantees stable unity-gain operation without external compensation components across temperature and supply variations. |
| Output Short-Circuit Protection | Enables robust operation in test fixtures or fault-prone signal paths without external current-limiting resistors. |
| Latch-Up Free Operation | Monolithic construction prevents destructive parasitic thyristor triggering under overvoltage or ESD stress. |
| Wide Common-Mode Range | ±11 V with ±15 V supply allows direct interfacing to transducers operating near supply rails. |
Applications
| Audio Pre-Amplifier | Active Bandpass Filter |
|---|---|
|
Use Scenario: Low-noise amplification of microphone or line-level signals before ADC sampling in consumer audio equipment. IC Role / Device Role / Timing Role: Single-ended voltage amplifier with 20 dB gain and 20 Hz–20 kHz bandwidth. Use Value: 15 nV/√Hz input noise and 0.01% THD ensure clean signal integrity without audible distortion. |
Use Scenario: Selective frequency extraction in vibration monitoring systems detecting mechanical resonance peaks. IC Role / Device Role / Timing Role: Dual-amplifier topology implementing second-order bandpass response centered at 1 kHz. Use Value: 4 MHz GBP and 16 V/µs slew rate maintain filter Q-factor and step response fidelity. |
| Function Generator Oscillator | DC Motor Speed Reference |
|
Use Scenario: Square-wave generation at 0.5 Hz for timing control in battery-powered environmental loggers. IC Role / Device Role / Timing Role: Schmitt-trigger configured with RC network to define oscillation period and hysteresis. Use Value: Rail-to-rail input common-mode range ensures reliable switching even with degraded supply voltages. |
Use Scenario: Precision voltage reference source for PWM-based speed control in industrial DC motor drives. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC output from variable load impedance of op-amp comparator inputs. Use Value: 20 nA input bias current prevents DAC output voltage shift due to leakage into reference divider. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar JFET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL071CP | Lower input noise (18 nV/√Hz vs. 15 nV/√Hz), identical pinout and specs except 0.5 dB higher CMRR. | Preferred in audio applications where noise floor dominates; less suitable for high-common-mode industrial sensing. | Select TL071CP only if noise specification is critical and supply rejection is secondary. |
| LF351N | Higher input bias current (30 nA max), same GBP and slew rate, but wider operating temperature range (−40°C to +85°C). | Better suited for extended-temperature industrial controls; requires larger offset null pot due to higher Iib. | Choose LF351N when ambient temperature exceeds +70°C and DC accuracy remains acceptable. |
Compared with TL081CN, TL071CP offers marginal noise improvement at cost of reduced CMRR, while LF351N trades lower DC precision for broader thermal tolerance - making TL081CN optimal for cost-sensitive, room-temperature analog signal chains requiring balanced performance.
Availability
TL081CN is available at Aetrix Electronics and suitable for audio pre-amplifiers, active filters, and function generator oscillators requiring stable component supply across production volumes and long-lifecycle programs.
Supply support for TL081CN 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TL081 series belongs to ST's general-purpose operational amplifier product line, engineered for reliability and consistency in cost-sensitive analog signal conditioning applications across commercial temperature ranges.
FAQ
Can TL081CN operate from a single +12 V supply?
Yes, TL081CN supports single-supply operation by referencing its VCC− pin to ground and applying +12 V to VCC+, but input common-mode and output swing are limited: Vicm = 0 to +9 V and Vopp ≈ +1 to +10 V with RL = 2 kΩ. Input coupling capacitors and output level-shifting may be required for full-range AC signals.
What is the purpose of Pins 1 and 5 on TL081CN?
Pins 1 and 5 are offset null terminals that connect to opposite ends of an external 100 Ω potentiometer (wiper to VCC−). Adjusting this potentiometer balances internal input transistor mismatches, reducing input offset voltage to ≤1 mV - essential for precision DC-coupled amplifiers and integrators.
How does TL081CN compare to LM741 in terms of bandwidth and input impedance?
TL081CN provides 2.5–4 MHz gain-bandwidth product and 10¹² Ω input impedance, versus LM741's 1 MHz GBP and 2 MΩ input resistance. This makes TL081CN superior for high-frequency AC amplification and high-impedance sensor interfaces where LM741 would introduce significant loading and bandwidth limitation.
Is TL081CN RoHS-compliant and lead-free?
Yes, TL081CN is manufactured in STMicroelectronics' ECOPACK®-compliant DIP8 package with lead-free second-level interconnects, meeting RoHS Directive 2011/65/EU requirements. The inner box label and package marking confirm compliance per JEDEC Standard JESD97.
TL081CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 16V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 1.4mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
TL081CN FAQ
1.How can I place an order for TL081CN through Aetrix?
Please submit a Request for Quotation (RFQ) for TL081CN 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 TL081CN reliable?
The price and inventory of TL081CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL081CN is usually 5 days.
3.What payment methods are accepted for TL081CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL081CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL081CN?
TL081CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL081CN 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 TL081CN?
For technical support, including TL081CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL081CN requirements.
6.How does Aetrix verify that TL081CN is sourced from the original manufacturer or authorized distributors?
All TL081CN 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 TL081CN meets industry standards.
7.What is the process for return or replacement of TL081CN?
All TL081CN units undergo pre-shipment inspection (PSI). If there is an issue with TL081CN, 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 TL081CN part is unused and in its original packaging.
Return procedure for TL081CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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