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STMicroelectronics TL081ACDT
- Part No.:
- TL081ACDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL081ACDT.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
TL081ACDT from STMicroelectronics is a JFET-input single operational amplifier optimized for general-purpose high-speed analog signal conditioning. It delivers 16 V/µs typical slew rate, ±11 V input common-mode range (at ±15 V supply), and 2.5–4 MHz gain-bandwidth product, with low 10 µV/°C offset drift and 10¹² Ω input resistance - used in precision instrumentation front-ends and active filter stages.
For engineers reviewing the TL081ACDT datasheet, TL081ACDT pinout, TL081ACDT application, or TL081ACDT equivalent, key selection factors include its JFET-input bias current (≤20 nA typ), output short-circuit protection, internal frequency compensation, and SO-8 package compatibility with legacy TL081 designs requiring stable DC performance and wide supply range (±3 V to ±18 V).
Technical Context
The TL081ACDT integrates matched high-voltage JFET and bipolar transistors on a monolithic die, enabling rail-to-rail input common-mode operation up to VCC and differential input voltage tolerance of ±30 V. Its internal frequency compensation ensures unity-gain stability without external components.
It features dual offset null pins (1 and 5) for precise DC calibration, latch-up-free operation across –40°C to +70°C, and robust ESD protection (1.5 kV CDM). The device operates from ±3 V to ±18 V supplies and supports load resistances down to 2 kΩ while maintaining ≥10 VPP output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 16 V/µs typical - enables faithful reproduction of fast-rising signals (e.g., 100 kHz square waves) without distortion in unity-gain buffer configurations. |
| Input Offset Voltage | 3 mV max (TL081A grade) - ensures ≤3 mV initial DC error at room temperature, critical for sensor amplification and low-level signal conditioning. |
| Input Bias Current | 20 nA max (TL081A, 25°C) - minimizes voltage drop across high-impedance source networks (e.g., photodiode or piezoelectric transducers). |
| Gain-Bandwidth Product | 2.5–4 MHz - defines usable small-signal bandwidth at closed-loop gains; e.g., 100 kHz available at ×40 gain with phase margin ≥45°. |
| Common-Mode Rejection | 70–86 dB - suppresses noise coupled equally to both inputs, essential in noisy industrial environments with long sensor leads. |
| Supply Voltage Range | ±3 V to ±18 V - supports dual-supply systems from low-power portable instruments (±5 V) to industrial PLC analog I/O modules (±15 V). |
| Output Short-Circuit Duration | Infinite - allows continuous safe shorting to either rail or ground without damage, simplifying fault-tolerant design in motor driver feedback paths. |
Pinout & Package
TL081ACDT is supplied in an SO-8 (Small Outline) plastic micropackage, 5.0 mm × 6.2 mm body, 1.27 mm pitch, with gull-wing leads and lead-free (ECOPACK®) finish per JEDEC JESD97.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external 100 Ω potentiometer for trimming input offset voltage; required only when sub-mV DC accuracy is needed. |
| 2 | Inverting Input (–) | Primary negative feedback node; high-impedance JFET gate input (10¹² Ω) minimizes loading of preceding stage or sensor. |
| 3 | Non-inverting Input (+) | Positive input for follower or non-inverting amplifier configurations; shares same high-Z, low-bias characteristics as Pin 2. |
| 4 | VCC– | Negative supply rail connection; must be decoupled locally with ≥100 nF ceramic capacitor to suppress high-frequency noise coupling. |
| 5 | Offset Null 2 | Connects to opposite end of same potentiometer as Pin 1; forms balanced nulling network with internal 35 kΩ resistors. |
| 6 | Output | Class-AB push-pull output stage capable of sourcing/sinking ≥10 mA; drives 2 kΩ loads to ±10 V with <10% overshoot. |
| 7 | VCC+ | Positive supply rail connection; requires local decoupling identical to Pin 4 to maintain PSRR >70 dB across audio band. |
| 8 | No Connect (N.C.) | Internally unconnected; must remain floating - no external tie or pull-up/pull-down permitted per STMicroelectronics design guidance. |
Key Features
| Feature | Design Value |
|---|---|
| High Input Impedance JFET Stage | 10¹² Ω input resistance enables direct interfacing with high-Z sources (e.g., pH electrodes, capacitive sensors) without signal attenuation. |
| Internal Frequency Compensation | Guarantees stable unity-gain operation without external compensation components - reduces BOM count and layout sensitivity in cost-sensitive designs. |
| Output Short-Circuit Protection | Allows indefinite short-circuit to either supply rail or ground while limiting junction temperature rise - eliminates need for external current-limiting resistors. |
| Latch-Up Free Operation | Prevents destructive parasitic thyristor activation during overvoltage transients or power sequencing anomalies - improves system reliability in mixed-signal PCBs. |
| Wide Common-Mode Input Range | ±11 V at ±15 V supply (i.e., extends to within 4 V of each rail) - supports level-shifting and single-supply biasing techniques in multi-stage amplifiers. |
Applications
| Audio Pre-Amplifier | Active Bandpass Filter |
|---|---|
|
Use Scenario: Low-noise amplification of microphone or line-level signals before ADC sampling in consumer audio interfaces. IC Role / Device Role / Timing Role: Single-supply non-inverting amplifier with gain = 10, DC-coupled input, and 20 Hz–20 kHz bandwidth shaping. Use Value: 0.01% THD at 1 kHz and 15 nV/√Hz input noise ensure fidelity preservation; SO-8 footprint enables compact 2-layer PCB layout. |
Use Scenario: Selective frequency rejection in biomedical instrumentation (e.g., ECG notch filtering at 50/60 Hz). IC Role / Device Role / Timing Role: High-Q twin-T or state-variable topology core amplifier with precise component ratio matching enabled by low offset drift. Use Value: 10 µV/°C offset drift prevents baseline wander over operating temperature; 86 dB CMRR rejects mains-coupled interference. |
| DC Motor Speed Reference | Thermocouple Signal Conditioning |
|
Use Scenario: Generating stable analog speed setpoint voltage for PWM motor controllers in HVAC blower modules. IC Role / Device Role / Timing Role: Precision voltage follower buffering a DAC output, driving 10 kΩ potentiometer wiper and op-amp input simultaneously. Use Value: 20 nA max input bias current avoids loading error on high-resistance DAC output; ±18 V supply tolerance accommodates 15 V control rails. |
Use Scenario: Cold-junction compensation and linearization of Type-K thermocouple outputs in industrial temperature transmitters. IC Role / Device Role / Timing Role: Instrumentation-grade difference amplifier with programmable gain and offset nulling via Pins 1/5. Use Value: Dual offset null pins enable <100 µV residual error after calibration; 10¹² Ω input impedance prevents thermocouple wire leakage errors. |
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 |
|---|---|---|---|
| TL071CDT | Lower input bias current (10 pA typ), lower noise (18 nV/√Hz), but no offset null pins and narrower common-mode range (±12 V). | Preferred for ultra-low-noise audio or high-impedance photodiode amps where offset trim is unnecessary. | Select TL071CDT when noise dominates over DC accuracy; avoid if offset nulling or rail-near input operation is required. |
| OPA134UA | Higher slew rate (20 V/µs), lower THD (0.00008%), wider GBW (8 MHz), but higher supply current (4 mA) and no SO-8 automotive-grade variant. | Better suited for high-fidelity audio line drivers or wideband active filters demanding >5 MHz bandwidth. | Choose OPA134UA for premium audio or wideband signal chains; TL081ACDT remains optimal for cost-sensitive, DC-accurate industrial analog I/O. |
Compared with TL071CDT and OPA134UA, TL081ACDT uniquely balances offset trim capability, robust short-circuit protection, and SO-8 automotive qualification - making it the preferred choice for industrial sensor signal chains where DC stability, fault resilience, and supply flexibility outweigh ultra-low-noise requirements.
Availability
TL081ACDT is available at Aetrix Electronics and suitable for industrial sensor interfaces, analog I/O modules, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL081ACDT 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, power ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.
The TL081 series belongs to ST's general-purpose analog amplifier product line, engineered for reliable, cost-effective signal conditioning in industrial control, test equipment, and legacy-compatible designs where JFET input performance and proven robustness are prioritized.
FAQ
Can TL081ACDT operate from a single +12 V supply?
Yes - TL081ACDT supports single-supply operation with VCC+ = +12 V and VCC– = 0 V. Its input common-mode range extends to within ~1.5 V of the negative rail, allowing input signals down to ~1.5 V. Output swing reaches ~1.5 V above ground and ~10 V below VCC+, so proper biasing (e.g., mid-rail reference) is required for AC-coupled signals.
What is the purpose of Pins 1 and 5 on TL081ACDT?
Pins 1 and 5 are dedicated offset null terminals. Internally connected to the bases of matched JFET input transistors, they form a balanced node for external 100 Ω potentiometer adjustment. Applying variable voltage between them injects corrective current to cancel input offset voltage - critical for DC-critical applications like precision integrators or strain gauge bridges.
Does TL081ACDT require external compensation capacitors?
No - TL081ACDT includes internal frequency compensation optimized for unity-gain stability. Adding external compensation capacitors is unnecessary and may degrade transient response or cause instability. External compensation is only needed for specialized configurations like decompensated high-speed variants (e.g., TL081H), not the standard TL081ACDT.
How does TL081ACDT differ from TL081CDT?
TL081ACDT is the "A" grade version: it guarantees tighter input offset voltage (3 mV max vs. 10 mV max for "C"), lower input offset voltage drift (10 µV/°C vs. unspecified for "C"), and improved common-mode rejection (86 dB min vs. 70 dB min). Both share identical SO-8 packaging, pinout, and absolute maximum ratings - "A" grade is selected for higher DC precision in production-critical applications.
TL081ACDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL081ACDT FAQ
1.How can I place an order for TL081ACDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL081ACDT 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 TL081ACDT reliable?
The price and inventory of TL081ACDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL081ACDT is usually 5 days.
3.What payment methods are accepted for TL081ACDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL081ACDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL081ACDT?
TL081ACDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL081ACDT 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 TL081ACDT?
For technical support, including TL081ACDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL081ACDT requirements.
6.How does Aetrix verify that TL081ACDT is sourced from the original manufacturer or authorized distributors?
All TL081ACDT 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 TL081ACDT meets industry standards.
7.What is the process for return or replacement of TL081ACDT?
All TL081ACDT units undergo pre-shipment inspection (PSI). If there is an issue with TL081ACDT, 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 TL081ACDT part is unused and in its original packaging.
Return procedure for TL081ACDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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