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Texas Instruments TLC2654AI-8D
- Part No.:
- TLC2654AI-8D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC2654AI-8D.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,728
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Product details
Overview
TLC2654AI-8D from Texas Instruments is a chopper-stabilized operational amplifier optimized for ultra-low-noise, high-precision DC signal conditioning. It delivers 10 µV max input offset voltage, 0.05 µV/°C offset drift, 13 nV/√Hz input noise at 1 kHz, 10 kHz chopping frequency, and operates from –40°C to 85°C in an 8-pin SOIC package. It is used in thermocouple amplifiers, strain gauge interfaces, and precision sensor front-ends where long-term stability and sub-microvolt accuracy are critical.
For engineers reviewing the TLC2654AI-8D datasheet, TLC2654AI-8D pinout, TLC2654AI-8D application, or TLC2654AI-8D equivalent, key selection considerations include its guaranteed 10 µV VIO max over temperature, absence of clock noise below 10 kHz, single-supply-compatible rail-to-rail common-mode input range (including VDD–), and integrated output clamp functionality for fast overload recovery.
Technical Context
The TLC2654AI-8D employs Advanced LinCMOS™ process technology with continuous auto-zeroing chopper stabilization, enabling real-time nulling of input offset voltage across temperature, time, and supply variations. Its 10 kHz internal chopping frequency eliminates intermodulation error up to 5 kHz while preserving low-frequency signal integrity.
It features a CMOS input stage with 50 pA typical input bias current, rail-inclusive common-mode input range (VDD– to VDD+ – 2.3 V), and an output clamp pin that reduces recovery time after saturation. The device requires two external capacitors (CXA, CXB) for chopper operation but provides transparent user interface - no external clock required unless overriding default frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 10 µV max over –40°C to 85°C - ensures minimal DC error without manual trimming in precision measurement paths. |
| Offset Drift | 0.05 µV/°C max - guarantees stable baseline in environments with thermal cycling, e.g., industrial sensors. |
| Input Noise Density | 13 nV/√Hz at 1 kHz - enables clean amplification of low-level signals such as microvolt-level thermocouple outputs. |
| Chopping Frequency | 10 kHz typ - suppresses 1/f noise and eliminates aliasing below 5 kHz, critical for subsonic and DC-coupled applications. |
| Common-Mode Range | VDD– to VDD+ – 2.3 V - supports true single-supply operation down to ±2.3 V, simplifying power architecture in battery-powered systems. |
| Supply Current | 1.5–2.4 mA - balances ultra-low-noise performance with moderate power consumption for portable instrumentation. |
| Large-Signal Gain | 135 dB min - provides high loop gain for accurate closed-loop configurations in feedback-based precision circuits. |
Pinout & Package
Package: 8-pin SOIC (D package), body width 3.9 mm, standard JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CXA) | Chopper capacitor A | Connects to external capacitor (typically 0.1 µF) to set chopper timing; essential for stabilization circuit operation. |
| 2 (IN–) | Inverting input | Differential input node; high-impedance CMOS input (50 pA bias current) for precision feedback networks. |
| 3 (IN+) | Non-inverting input | Differential input node; accepts signals referenced to VDD–, supporting rail-to-rail common-mode operation. |
| 4 (VDD–) | Negative supply rail | Reference for all internal circuitry; common-mode input range extends to this pin, enabling true single-supply use. |
| 5 (CXB) | Chopper capacitor B | Second external capacitor terminal; paired with CXA to form chopper oscillator tank network. |
| 6 (VDD+) | Positive supply rail | Supports ±2.3 V to ±8 V dual supply or 4.6 V to 16 V single supply; internal regulation ensures stable core operation. |
| 7 (OUT) | Amplifier output | Capable of ±4.7 V swing into 10 kΩ; includes internal protection against ±100 mA surge without latch-up. |
| 8 (CLAMP) | Output clamp control | Active-low clamp pin; when pulled low, limits output excursion to reduce recovery time after overdrive. |
Key Features
| Feature | Design Value |
|---|---|
| No clock noise below 10 kHz | Enables clean amplification of signals up to 5 kHz without spectral contamination from chopping artifacts. |
| Output clamp pin | Reduces overload recovery time significantly - critical for multiplexed sensor systems where rapid settling is required. |
| Rail-inclusive common-mode input | Allows direct interfacing with grounded-sensor outputs (e.g., thermocouples) without level-shifting circuitry. |
| ESD protection | Withstands 2000 V HBM per MIL-STD-883C Method 3015 - improves robustness during PCB handling and system integration. |
| Stable under capacitive loads | Maintains 48° phase margin with 100 pF load - permits direct driving of ADC input capacitors or long traces without oscillation. |
Applications
| Thermocouple Amplifier | Strain Gauge Interface |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltages from Type-K thermocouples in industrial ovens or HVAC systems. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with auto-zeroing to reject thermal EMF drift and maintain calibration over temperature cycles. Use Value: 0.05 µV/°C offset drift and 10 µV max VIO eliminate need for periodic recalibration in field-deployed equipment. | Use Scenario: Conditioning mV-level bridge outputs from metal foil strain gauges in load cells or structural health monitoring. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance buffer and amplifier with rail-to-rail input capability to maximize dynamic range. Use Value: 13 nV/√Hz noise density preserves SNR in low-excitation bridge configurations (<5 V), improving resolution beyond 16-bit ADCs. |
| Medical Instrumentation Front-End | Subsonic Signal Acquisition |
Use Scenario: Biopotential signal amplification (ECG, EEG) requiring ultra-low DC drift and immunity to electrode polarization voltages. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with chopper stabilization to suppress 1/f noise and maintain baseline stability over minutes/hours. Use Value: Absence of intermodulation error below 5 kHz prevents distortion of slow-wave neural activity, ensuring diagnostic fidelity. | Use Scenario: Seismic or vibration sensor signal chains capturing frequencies from 0.01 Hz to 10 Hz in geophysical monitoring. IC Role / Device Role / Timing Role: DC-coupled, low-drift gain block with no aliasing artifacts - critical for accurate integration of acceleration data. Use Value: 10 kHz chopping frequency ensures no folding of out-of-band noise into the subsonic band, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar chopper-stabilized op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC2652AI-8D | 450 Hz chopping frequency vs. 10 kHz; higher 1/f noise corner but lower wideband noise (9 nV/√Hz at 1 kHz). | Better suited for very low-frequency (<10 Hz) applications where 1/f noise dominates; less suitable for bandwidths >1 kHz. | Select TLC2652AI-8D only if sub-10 Hz stability is prioritized over mid-band noise and aliasing immunity. |
| OPA2189IDR | Zero-drift architecture with 5.2 nV/√Hz noise at 1 kHz, 0.005 µV/°C drift, but no dedicated clamp pin and narrower temp range (–40°C to 125°C). | Lacks output clamp functionality and uses different capacitor configuration; not drop-in compatible for existing TLC2654AI-8D layouts. | Choose OPA2189IDR for lowest possible drift/noise trade-off in new designs where clamp is unnecessary and layout revision is acceptable. |
Compared with TLC2652AI-8D and OPA2189IDR, the TLC2654AI-8D uniquely combines 10 kHz chopping (enabling clean 5 kHz signal bandwidth), integrated CLAMP pin for fast recovery, and guaranteed 10 µV VIO max over industrial temperature range - making it optimal for legacy-replacement and ruggedized instrumentation where reliability and known behavior are paramount.
Availability
TLC2654AI-8D is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, and medical biopotential front-ends requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TLC2654AI-8D 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies, with decades of heritage in precision analog design.
The TLC2654 family was engineered specifically for high-accuracy, low-drift DC signal conditioning in harsh industrial and automotive environments - emphasizing chopper-stabilized architecture, rail-inclusive inputs, and robust ESD/surge tolerance.
FAQ
What is the maximum operating temperature range for the TLC2654AI-8D?
The TLC2654AI-8D is characterized for operation from –40°C to +85°C, as indicated by the "I" temperature suffix. This industrial-grade rating ensures reliable performance in factory automation, motor control, and outdoor instrumentation where ambient temperatures exceed commercial limits. The device maintains all specified parameters-including 10 µV max input offset voltage-across this full range.
Does the TLC2654AI-8D require external clocking?
No, the TLC2654AI-8D does not require external clocking. Its internal chopper runs at 10 kHz typ and is fully self-contained. External capacitors CXA and CXB (pins 1 and 5) set the chopping frequency, but no external clock source or connection is needed. The INT/EXT and CLK IN/OUT pins are absent in the 8-pin D package, confirming autonomous operation.
How does the CLAMP pin on the TLC2654AI-8D improve system performance?
The CLAMP pin (pin 8) on the TLC2654AI-8D actively limits output voltage excursion during overload, reducing recovery time after saturation by orders of magnitude. When pulled low, it engages internal circuitry that clamps the output near rail, preventing deep saturation of internal stages. This is especially valuable in multiplexed sensor systems or fast-settling data acquisition where traditional op-amps would exhibit prolonged recovery delays.
Can the TLC2654AI-8D operate from a single supply?
Yes, the TLC2654AI-8D supports true single-supply operation. Its common-mode input voltage range extends to VDD–, and output swings to within 0.3 V of both rails (±4.7 V into 10 kΩ). With VDD– = 0 V and VDD+ = 5 V, it accepts inputs from 0 V to 2.7 V and delivers outputs from ~0.3 V to ~4.7 V - ideal for interfacing with grounded sensors and low-voltage ADCs without level-shifting circuitry.
What external components are mandatory for TLC2654AI-8D operation?
Two external capacitors are mandatory: CXA (0.1 µF, 10% X7R) between pin 1 (CXA) and VDD–, and CXB (0.1 µF, 10% X7R) between pin 5 (CXB) and VDD–. These set the chopper frequency and stabilize the auto-zeroing loop. No other passive components are required for basic operation, though proper power supply decoupling (e.g., 0.1 µF ceramic near VDD+/VDD–) is strongly recommended.
TLC2654AI-8D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3.7V/µs
- Gain Bandwidth Product:
- 1.9 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 4 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TLC2654AI-8D FAQ
1.How can I place an order for TLC2654AI-8D through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2654AI-8D 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 TLC2654AI-8D reliable?
The price and inventory of TLC2654AI-8D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2654AI-8D is usually 5 days.
3.What payment methods are accepted for TLC2654AI-8D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2654AI-8D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2654AI-8D?
TLC2654AI-8D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2654AI-8D 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 TLC2654AI-8D?
For technical support, including TLC2654AI-8D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2654AI-8D requirements.
6.How does Aetrix verify that TLC2654AI-8D is sourced from the original manufacturer or authorized distributors?
All TLC2654AI-8D 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 TLC2654AI-8D meets industry standards.
7.What is the process for return or replacement of TLC2654AI-8D?
All TLC2654AI-8D units undergo pre-shipment inspection (PSI). If there is an issue with TLC2654AI-8D, 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 TLC2654AI-8D part is unused and in its original packaging.
Return procedure for TLC2654AI-8D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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