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STMicroelectronics TL081IN
- Part No.:
- TL081IN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL081IN.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
TL081IN from STMicroelectronics is a general-purpose JFET-input single operational amplifier in an 8-pin DIP package, featuring 16 V/µs typical slew rate, ±11 V input common-mode range, and 2.5 MHz gain-bandwidth product. It delivers low input bias current (20 nA typ), high input impedance (10¹² Ω), and output short-circuit protection for precision analog signal conditioning in industrial instrumentation.
For engineers reviewing the TL081IN datasheet, TL081IN pinout, TL081IN application, or TL081IN equivalent, key selection criteria include input offset voltage drift (10 µV/°C), supply voltage rejection ratio (80 dB), thermal resistance (85 °C/W), and compatibility with ±15 V dual-rail systems in linear amplifier and active filter designs.
Technical Context
The TL081IN integrates matched high-voltage JFET and bipolar transistors on a monolithic die to achieve high slew rate and low input currents while maintaining internal frequency compensation for unity-gain stability. Its JFET input stage enables rail-to-rail common-mode operation up to VCC+ and supports differential input voltages up to ±30 V.
Designed for robustness, it features latch-up free operation, output short-circuit protection with infinite duration rating under power limits, and ESD tolerance of 500 V HBM. The device operates across –40°C to +105°C and supports supply voltages from ±3 V to ±18 V (6–36 V total).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 16 V/µs typical - enables clean amplification of fast-rising signals up to ~1 MHz without slew-induced distortion |
| Gain-Bandwidth Product | 2.5 MHz typical - defines usable closed-loop bandwidth at gain = 10 (e.g., 250 kHz) |
| Input Offset Voltage | 3 mV max (TL081I grade) - sets DC error floor in precision DC-coupled amplifiers |
| Input Bias Current | 20 nA typical at +25°C - minimizes voltage drop across high-impedance sensor interfaces |
| Common-Mode Rejection Ratio | 80 dB minimum - ensures stable gain when input common-mode varies (e.g., in transducer bridges) |
| Supply Voltage Range | ±3 V to ±18 V (6–36 V total) - supports dual-rail operation in legacy industrial control systems |
| Output Short-Circuit Current | 60 mA typical - allows safe fault handling without external current limiting in buffered configurations |
Pinout & Package
TL081IN is housed in an 8-pin plastic dual in-line package (DIP8) with through-hole mounting. Package dimensions comply with JEDEC MS-001, with 2.54 mm lead pitch and 9.27 mm body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external 10 kΩ potentiometer for trimming input offset voltage |
| 2 | Inverting Input | Primary negative feedback node; accepts signal or reference for inverting amplifier configurations |
| 3 | Non-inverting Input | Positive input terminal; used in non-inverting, voltage follower, and comparator applications |
| 4 | VCC− | Negative supply rail connection; must be referenced to system ground or negative rail |
| 5 | Offset Null 2 | Connects to opposite end of same potentiometer as Pin 1 for balanced null adjustment |
| 6 | Output | Amplified single-ended output; capable of ±12 V swing into 2 kΩ load at ±15 V supplies |
| 7 | VCC+ | Positive supply rail connection; completes dual-supply biasing for rail-symmetric operation |
| 8 | No Connect | Internally unconnected; must remain floating - no external tie or pull-up/pull-down |
Key Features
| Feature | Design Value |
|---|---|
| High Input Impedance JFET Stage | 10¹² Ω input resistance - preserves signal integrity in high-Z sensor front-ends (e.g., piezoelectric, pH electrodes) |
| Internal Frequency Compensation | Unity-gain stable without external components - simplifies design of buffers and low-gain amplifiers |
| Wide Common-Mode Input Range | ±11 V at ±15 V supplies - accommodates inputs near supply rails in single-supply derived systems |
| Output Short-Circuit Protection | Infinite duration rating under thermal limits - eliminates need for external foldback circuitry in test equipment |
| Latch-Up Free Operation | Guaranteed over full temperature and supply range - prevents catastrophic failure during overvoltage transients |
Applications
| Industrial Signal Conditioning | Active Filter Design |
|---|---|
|
Use Scenario: Amplifying low-level thermocouple or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision DC-coupled non-inverting amplifier with adjustable gain and offset nulling. Use Value: 10 µV/°C offset drift and 80 dB CMRR maintain measurement accuracy across –40°C to +70°C ambient. |
Use Scenario: Implementing 2nd-order high-Q notch filters to suppress 50/60 Hz mains interference in medical ECG front-ends. IC Role / Device Role / Timing Role: Dual-feedback topology op-amp providing precise pole-zero placement and low THD (0.01% at 1 kHz). Use Value: 2.5 MHz GBP and 16 V/µs slew rate support stable Q > 20 at 60 Hz without peaking or phase inversion. |
| Test Equipment Buffers | Legacy Audio Line Drivers |
|
Use Scenario: Driving 50 Ω coaxial cables from function generator outputs in benchtop test instruments. IC Role / Device Role / Timing Role: Unity-gain voltage follower with low output impedance and high slew rate. Use Value: 60 mA short-circuit current and ±12 V output swing into 2 kΩ ensure drive capability into reactive loads without clipping. |
Use Scenario: Low-noise preamplifier stage in vintage-style audio mixing consoles requiring discrete-JFET character. IC Role / Device Role / Timing Role: Inverting gain stage with 15 nV/√Hz input noise and 0.01% THD at 2 Vpp. Use Value: JFET input preserves high-frequency detail and avoids crossover distortion seen in bipolar-input alternatives. |
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 bias current (65 pA typ), lower noise (18 nV/√Hz), but narrower common-mode range (±10 V) | Better suited for ultra-high-Z photodiode amps; less tolerant of rail-adjacent inputs | Select when lowest input current dominates over common-mode margin |
| LF356N | Higher slew rate (12 V/µs), wider GBP (5 MHz), but higher input offset (5 mV max) and no offset null pins | Preferred for wideband integrators and fast pulse amplifiers where trimming isn't required | Select when bandwidth and speed outweigh DC precision and adjustability needs |
Compared with TL071CP and LF356N, TL081IN offers unique offset null pins and superior common-mode range (±11 V), making it optimal for industrial transducer interfaces where input voltage swings near supply rails and field calibration is needed.
Availability
TL081IN is available at Aetrix Electronics and suitable for industrial signal conditioning, active filter design, and test equipment buffer circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL081IN 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 microcontrollers, analog ICs, power devices, and sensors for industrial, automotive, and consumer markets.
The TL081 series belongs to ST's legacy precision analog portfolio, developed specifically for cost-sensitive, high-reliability industrial instrumentation requiring JFET input performance with robust thermal and ESD specifications.
FAQ
What is the maximum operating temperature range for TL081IN?
The TL081IN is rated for operation from –40°C to +105°C, as confirmed by Table 2 in the ST datasheet. This extended industrial temperature range is validated across all electrical parameters including input offset voltage, slew rate, and supply current, making it suitable for deployment in harsh environments such as factory automation controllers and outdoor monitoring systems.
Does TL081IN require external compensation capacitors?
No - TL081IN incorporates internal frequency compensation optimized for unity-gain stability, as stated in the "Features" section and verified in Figure 11 (phase margin = 45°). External compensation is unnecessary for standard inverting or non-inverting configurations with gains ≥ 1, though may be added for specialized high-speed or high-Q filter topologies.
Can TL081IN operate from a single 12 V supply?
Yes - TL081IN supports total supply voltages from 6 V to 36 V, enabling single-supply use (e.g., +12 V and GND). However, its input common-mode range extends only to within ~3 V of the negative rail (GND), and output swing is limited to ~10 V peak-to-peak, so level-shifting or rail-splitting may be needed for AC-coupled signals centered at mid-supply.
How is the offset null function implemented on TL081IN?
TL081IN provides dedicated Offset Null 1 (Pin 1) and Offset Null 2 (Pin 5) terminals. A 10 kΩ potentiometer is connected between these pins, with its wiper tied to VCC− (Pin 4); adjusting the potentiometer balances internal input transistor mismatches to reduce input offset voltage to ≤1 mV in production calibration.
TL081IN 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:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
TL081IN FAQ
1.How can I place an order for TL081IN through Aetrix?
Please submit a Request for Quotation (RFQ) for TL081IN 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 TL081IN reliable?
The price and inventory of TL081IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL081IN is usually 5 days.
3.What payment methods are accepted for TL081IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL081IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL081IN?
TL081IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL081IN 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 TL081IN?
For technical support, including TL081IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL081IN requirements.
6.How does Aetrix verify that TL081IN is sourced from the original manufacturer or authorized distributors?
All TL081IN 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 TL081IN meets industry standards.
7.What is the process for return or replacement of TL081IN?
All TL081IN units undergo pre-shipment inspection (PSI). If there is an issue with TL081IN, 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 TL081IN part is unused and in its original packaging.
Return procedure for TL081IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL081IN Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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LM2904DGKR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
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