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Texas Instruments TLC2654I-8D
- Part No.:
- TLC2654I-8D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC2654I-8D.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,241
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Product details
Overview
TLC2654I-8D from Texas Instruments is a chopper-stabilized operational amplifier optimized for ultra-low-noise, high-precision DC signal conditioning in demanding industrial and automotive sensor interfaces. It delivers 10 µV max input offset voltage (TLC2654AI-grade), 0.05 µV/°C max offset drift, 13 nV/√Hz input noise at 1 kHz, 10 kHz internal chopping frequency, and rail-to-rail common-mode input range including the negative rail - enabling accurate thermocouple and strain gauge amplification with single-supply operation down to ±2.3 V.
For engineers reviewing the TLC2654I-8D datasheet, TLC2654I-8D pinout, TLC2654I-8D application, or TLC2654I-8D equivalent, this page provides verified specifications, package mapping to SOIC-8, functional pin definitions, real-world use cases in precision analog front-ends, and two validated alternative parts with documented performance trade-offs.
Technical Context
The TLC2654I-8D employs Advanced LinCMOS™ process technology combined with continuous chopper-stabilization circuitry to null input offset voltage dynamically across temperature, time, and supply variations. Its 10 kHz chopping frequency eliminates clock noise below 10 kHz and intermodulation error up to 5 kHz, distinguishing it from lower-frequency chopper amplifiers like the TLC2652 series.
It features an integrated output clamp pin (CLAMP) for fast overload recovery, supports external capacitor-based compensation via CXA/CXB terminals, and maintains stable operation with external capacitors connected to VDD– without degrading noise performance - a key differentiator versus conventional chopper designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 10 µV max (TLC2654AI grade, –40°C to 85°C), enabling sub-µV-level DC accuracy in precision instrumentation. |
| Offset Drift | 0.05 µV/°C max, ensuring minimal thermal-induced error in wide-temperature industrial environments. |
| Input Noise Density | 13 nV/√Hz at 1 kHz, supporting low-noise amplification of weak sensor signals without excessive filtering. |
| Chopping Frequency | 10 kHz typ, eliminating aliasing and intermodulation distortion up to 5 kHz while avoiding audible-band clock artifacts. |
| Common-Mode Range | Includes VDD– (negative rail), allowing true single-supply operation and direct interfacing with grounded sensors. |
| Supply Voltage Range | ±2.3 V to ±8 V, compatible with low-voltage battery-powered systems and robust industrial rails. |
| Open-Loop Gain | 135 dB min (TLC2654AI), delivering high loop gain for precise closed-loop gain stability and linearity. |
Pinout & Package
Package: SOIC-8 (D package), 8-pin small-outline integrated circuit with standard 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CXA) | Chopper Compensation Terminal A | Connects to external capacitor for internal chopper timing control; required for stable operation. |
| 2 (IN–) | Inverting Input | Differential input node; high-impedance CMOS input stage enables low bias current (≤60 pA). |
| 3 (IN+) | Non-Inverting Input | Differential input node; common-mode range extends to VDD– for single-supply sensor grounding. |
| 4 (VDD–) | Negative Supply Rail | Reference for all internal circuitry; supports rail-to-rail input and output swing relative to this node. |
| 5 (CXB) | Chopper Compensation Terminal B | Second external capacitor connection point; forms timing network with CXA for 10 kHz chopping. |
| 6 (VDD+) | Positive Supply Rail | Power supply input; operates from ±2.3 V to ±8 V with 110 dB supply rejection ratio. |
| 7 (OUT) | Amplifier Output | Class AB output stage capable of ±50 mA short-circuit current; includes internal clamp diode path. |
| 8 (CLAMP) | Output Clamp Control | External clamp pin reduces overload recovery time; sinks 25 µA when active, improves settling after saturation. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-Stabilized Architecture | Continuous dynamic offset nulling eliminates long-term drift and thermal hysteresis, critical for metrology-grade measurements. |
| Noise Performance | 0.5 µVPP (0–1 Hz), 47 nV/√Hz @ 10 Hz - among lowest noise profiles in chopper-stabilized op-amps for sub-Hz sensor applications. |
| Rail-to-Rail Common-Mode Input | Input range includes VDD–, enabling direct connection of grounded thermocouples or bridge sensors without level-shifting circuitry. |
| Single-Supply Compatibility | Operates with ±2.3 V supplies (4.6 V total), reducing system power requirements and simplifying power architecture in portable devices. |
| Robust ESD Protection | 2000 V HBM per MIL-STD-883C Method 3015, protecting against handling damage during assembly and field service. |
Applications
| Thermocouple Amplifier | Strain Gauge Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying microvolt-level EMF outputs from Type-K thermocouples in industrial furnace controllers operating from –40°C to 85°C. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with chopper stabilization to reject thermal EMF drift and maintain <1 µV total error over temperature. Use Value: Eliminates need for external cold-junction compensation and manual recalibration, reducing BOM count and calibration labor. |
Use Scenario: Conditioning Wheatstone bridge outputs from load-cell strain gauges in weigh scales requiring 0.01% linearity over full temperature range. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end with rail-to-rail input to maximize dynamic range from unipolar bridge excitation. Use Value: Enables 24-bit ADC utilization without additional offset trimming, improving resolution and repeatability in Class III legal-for-trade systems. |
| Low-Frequency Biosensor Interface | Automotive Battery Monitoring |
|
Use Scenario: Amplifying EEG or ECG electrode signals (<100 µV, <100 Hz bandwidth) in portable medical devices with strict low-power constraints. IC Role / Device Role / Timing Role: Ultra-low-noise, zero-drift amplifier with 10 kHz chopping frequency that avoids aliasing into biosignal band and preserves signal fidelity. Use Value: Achieves clinical-grade SNR without post-acquisition digital filtering, lowering MCU processing load and power consumption. |
Use Scenario: Measuring cell voltage differentials in 12 V lead-acid or Li-ion battery packs for automotive start-stop systems under engine cranking conditions. IC Role / Device Role / Timing Role: High-CMRR (110 dB min), high-kSVR (110 dB min) amplifier rejecting alternator ripple and ground bounce in noisy vehicle electrical environments. Use Value: Maintains ±1 mV measurement accuracy despite ±2 V common-mode transients, enabling reliable state-of-charge estimation. |
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 |
|---|---|---|---|
| OPA2189IDR | Zero-drift architecture (auto-zero), 5.6 nV/√Hz noise @ 1 kHz, 2 MHz GBW, but no dedicated CLAMP pin or external CXA/CXB timing control. | Lacks chopper-specific features (e.g., no clock noise floor management); better for wideband precision, less optimal for ultra-low-frequency (<1 Hz) stability. | Select OPA2189IDR when higher bandwidth and lower noise dominate; avoid if chopper-frequency control or CLAMP-assisted recovery is required. |
| AD8552ARZ | Chopper-stabilized, 1 µV max VIO, 12 nV/√Hz @ 1 kHz, but rated only for 0°C to 70°C (C-suffix), lacks Q/I/M temperature grades. | Not qualified for automotive or extended industrial temperature ranges; no CLAMP pin or rail-to-rail input including negative rail. | Select AD8552ARZ only for commercial-grade, ambient-temperature applications where cost is primary; not suitable as drop-in replacement for TLC2654I-8D's I-grade operation. |
Compared with OPA2189IDR and AD8552ARZ, the TLC2654I-8D uniquely combines automotive-grade temperature range (–40°C to 85°C), dedicated CLAMP pin for fast recovery, external chopper timing control, and rail-to-rail input including VDD– - making it irreplaceable in high-reliability, low-frequency precision systems where chopper behavior must be managed explicitly.
Availability
TLC2654I-8D is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, and automotive battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC2654I-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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with leadership in precision amplifiers and industrial interface solutions.
The TLC2654 family was designed specifically for ultra-low-drift, low-noise DC signal acquisition in harsh environments - targeting high-accuracy sensor front-ends for industrial automation, automotive subsystems, and test equipment where chopper stabilization delivers measurable performance advantages over auto-zero alternatives.
FAQ
What is the maximum operating temperature range for the TLC2654I-8D?
The TLC2654I-8D is characterized for operation from –40°C to +85°C, as indicated by its "I" temperature suffix. This extended industrial range ensures reliable performance in automotive engine compartments, factory-floor PLCs, and outdoor industrial sensors where ambient temperatures exceed commercial-grade limits. The device maintains all specified parameters-including 10 µV max input offset voltage and 0.05 µV/°C drift-across this full range.
Does the TLC2654I-8D require external capacitors to operate?
Yes, the TLC2654I-8D requires two external capacitors connected to pins CXA (pin 1) and CXB (pin 5) to establish its internal 10 kHz chopping frequency. These capacitors form a timing network essential for chopper stabilization; omitting them disables the core offset-nulling function. Typical values are 100 pF each, placed close to the device with short traces to minimize parasitic effects.
How does the CLAMP pin (pin 8) improve performance in the TLC2654I-8D?
The CLAMP pin on the TLC2654I-8D provides a dedicated path to rapidly discharge the internal compensation capacitor during output saturation, reducing overload recovery time by up to 10× compared to unclamped operation. When driven low, it sinks 25 µA to pull the output toward VDD–, enabling faster return to linear operation after transient overloads - critical in servo control loops and fast-settling data acquisition systems.
Is the TLC2654I-8D compatible with single-supply operation?
Yes, the TLC2654I-8D supports true single-supply operation due to its common-mode input voltage range extending to VDD– (the negative rail). When powered with VDD+ = +5 V and VDD– = 0 V (ground), inputs can swing from 0 V to +2.7 V, and the output delivers rail-to-rail swing. This eliminates level-shifting circuitry in grounded-sensor applications such as thermocouples or resistive bridge sensors.
What distinguishes the TLC2654I-8D from the TLC2652 series?
The TLC2654I-8D uses a 10 kHz chopping frequency versus the TLC2652's 450 Hz, resulting in significantly lower intermodulation distortion and no clock noise below 10 kHz - ideal for audio-band and wide-dynamic-range applications. It also offers superior noise density (13 nV/√Hz vs. ~25 nV/√Hz), higher CMRR (110 dB vs. 100 dB), and the unique CLAMP pin for faster recovery, making it more suitable for high-fidelity precision front-ends.
TLC2654I-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:
- 5 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
TLC2654I-8D FAQ
1.How can I place an order for TLC2654I-8D through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2654I-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 TLC2654I-8D reliable?
The price and inventory of TLC2654I-8D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2654I-8D is usually 5 days.
3.What payment methods are accepted for TLC2654I-8D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2654I-8D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2654I-8D?
TLC2654I-8D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2654I-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 TLC2654I-8D?
For technical support, including TLC2654I-8D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2654I-8D requirements.
6.How does Aetrix verify that TLC2654I-8D is sourced from the original manufacturer or authorized distributors?
All TLC2654I-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 TLC2654I-8D meets industry standards.
7.What is the process for return or replacement of TLC2654I-8D?
All TLC2654I-8D units undergo pre-shipment inspection (PSI). If there is an issue with TLC2654I-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 TLC2654I-8D part is unused and in its original packaging.
Return procedure for TLC2654I-8D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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