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Texas Instruments TLC271BCD
- Part No.:
- TLC271BCD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC271BCD.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:691
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Product details
Overview
TLC271BCD from Texas Instruments is a programmable low-power LinCMOS™ operational amplifier in an 8-pin SOIC (D) package, featuring bias-select mode for configurable power/performance tradeoffs, 2 mV max input offset voltage at 25°C, 3.6 V/µs slew rate (high-bias), and rail-to-rail output swing down to GND - used in precision sensor signal conditioning and battery-powered instrumentation.
For engineers reviewing the TLC271BCD datasheet, TLC271BCD pinout, TLC271BCD application, or TLC271BCD equivalent, this device requires attention to bias-select voltage configuration, common-mode input range extending below negative rail, and temperature-stable offset drift (0.1 µV/month) in low-drift analog front-ends.
Technical Context
The TLC271BCD implements a silicon-gate LinCMOS™ process enabling high input impedance (10¹² Ω typ), ultra-low input bias current (0.6 pA typ at 25°C), and ESD protection rated to 2000 V (MIL-STD-883C). Its three selectable bias modes (high/medium/low) directly configure internal current sources to adjust slew rate (3.6 / 0.4 / 0.03 V/µs), unity-gain bandwidth (1.7 / 0.5 / 0.09 MHz), and supply current (675 / 525 / 50 µA).
It supports single-supply operation from 3 V to 16 V over 0°C to 70°C, with common-mode input voltage range extending 0.2 V below GND at VDD = 5 V. The device includes two offset null pins (OFFSET N1/N2) and a dedicated BIAS SELECT terminal for external voltage programming - no internal pull-ups or fixed biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | Max 2 mV at 25°C - enables DC-coupled amplification of µV-level sensor outputs without significant baseline error. |
| Slew Rate (High Bias) | 3.6 V/µs - supports >100 kHz small-signal bandwidth in unity-gain buffer configurations. |
| Supply Current (High Bias) | 675 µA typ at 25°C - allows continuous operation on coin-cell batteries for months in low-duty-cycle monitoring systems. |
| Input Impedance | 10¹² Ω typ - minimizes loading on high-Z sources like piezoelectric sensors or pH electrodes. |
| Common-Mode Range | Extends 0.2 V below GND at VDD = 5 V - permits direct interfacing to ground-referenced transducers without level-shifting circuitry. |
| ESD Rating | 2000 V HBM - meets industrial handling requirements without additional external protection diodes. |
| Offset Drift | 0.1 µV/month - ensures long-term calibration stability in unattended environmental monitoring equipment. |
Pinout & Package
Package: 8-pin SOIC (D), 150 mil width, tape-and-reel compatible (R suffix available).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFFSET N1) | Offset null input | Connects to internal differential pair tail current node; used with Pin 8 to trim input offset voltage via external potentiometer. |
| 2 (IN–) | Inverting input | Differential input terminal with 10¹² Ω impedance; accepts signals down to –0.2 V when VDD = 5 V. |
| 3 (IN+) | Non-inverting input | Differential input terminal with identical high-impedance and common-mode range as IN–. |
| 4 (GND) | Ground reference | Power and signal reference plane; common return for bias select divider and offset null network. |
| 5 (BIAS SELECT) | Bias mode control | Voltage-programmed terminal: 0 V = low bias, VDD/2 = medium bias, VDD = high bias - sets internal quiescent current. |
| 6 (VDD) | Positive supply | Single or dual supply rail (3–16 V); powers all internal stages including bias-select logic and output driver. |
| 7 (OUT) | Amplifier output | Class-AB output stage capable of sourcing/sinking ±30 mA; swings to GND and within 1.2 V of VDD at full load. |
| 8 (OFFSET N2) | Offset null output | Second terminal of internal offset null network; completes 3-terminal trimming circuit with Pin 1 and external resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Bias-select programmability | Three discrete operating points (high/medium/low) enable dynamic tradeoff between speed (3.6 V/µs), noise (25 nV/√Hz), and power (50–675 µA) without changing hardware. |
| Rail-to-rail output | Output drives to GND and within 1.2 V of VDD under 10 kΩ load - eliminates need for negative supply in single-supply data acquisition systems. |
| Sub-picoampere input bias | 0.6 pA typical input bias current at 25°C - preserves signal integrity in high-impedance photodiode or capacitive sensor interfaces. |
| Offset null capability | Dedicated OFFSET N1/N2 pins allow <10 µV residual offset after trimming - critical for precision weigh-scale and medical instrumentation front-ends. |
| Wide supply range | Operates from 3 V to 16 V across 0°C to 70°C - supports both low-voltage IoT nodes and industrial 12 V PLC analog modules. |
Applications
| Strain Gauge Signal Conditioning | Portable ECG Front-End |
|---|---|
Use Scenario: Amplifying µV-level Wheatstone bridge outputs from load cells in factory floor weighing systems. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier core with offset trimming and low-drift gain staging. Use Value: 2 mV max VIO and 0.1 µV/month drift ensure calibration validity over 6-month maintenance cycles without recalibration. | Use Scenario: Biopotential amplification in handheld electrocardiogram monitors powered by CR2032 batteries. IC Role / Device Role / Timing Role: Low-noise, low-power first-stage amplifier with rail-to-rail output driving 12-bit SAR ADC. Use Value: 50 µA low-bias mode extends battery life beyond 12 months while maintaining 0.5 µV RMS input-referred noise at 1 kHz. |
| Thermocouple Cold-Junction Compensation | Industrial 4–20 mA Loop Transmitter |
Use Scenario: Linearizing and cold-junction compensating Type-K thermocouple outputs in HVAC controllers. IC Role / Device Role / Timing Role: Programmable-gain amplifier with integrated reference buffer and offset correction. Use Value: Common-mode input range extending below GND allows direct connection to thermocouple junctions referenced to chassis ground. | Use Scenario: Voltage-to-current conversion and loop regulation in smart pressure transmitters. IC Role / Device Role / Timing Role: High-impedance sensing amplifier feeding voltage-controlled current source with precise zero-point adjustment. Use Value: OFFSET N1/N2 pins enable field-trimmable 4 mA zero current with <0.01% accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1BCD | Lower supply current (190 µA typ), reduced slew rate (0.045 V/µs), same 2 mV VIO grade and D package. | Optimized for ultra-low-power sensor nodes where bandwidth <1 kHz is acceptable. | Select when average supply current must remain below 200 µA and AC performance is secondary to energy efficiency. |
| TLV2462CDR | Rail-to-rail I/O, higher slew rate (0.6 V/µs), lower VIO (1.5 mV max), but no offset null pins or bias-select feature. | Preferred for general-purpose RRO applications requiring faster settling without programmability. | Choose when design requires guaranteed rail-to-rail input/output swing and simplified biasing, but does not require long-term drift stability or trimming. |
Compared with TLC27L1BCD and TLV2462CDR, the TLC271BCD uniquely combines programmable bias, offset null capability, and sub-pA input bias - making it irreplaceable in applications demanding both ultra-low drift and runtime-configurable performance.
Availability
TLC271BCD is available at Aetrix Electronics and suitable for precision sensor signal conditioning, portable medical instrumentation, and industrial 4–20 mA loop transmitters requiring stable component supply across extended production lifecycles.
Supply support for TLC271BCD 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 solutions for industrial, automotive, and communications markets.
The TLC271 product line delivers programmable LinCMOS™ op-amps optimized for low-power, high-precision analog signal chains in battery-operated and industrial measurement systems.
FAQ
What is the maximum supply voltage rating for the TLC271BCD?
The TLC271BCD has an absolute maximum supply voltage (VDD) rating of 18 V. However, its recommended operating range is 3 V to 16 V across the 0°C to 70°C temperature range. Operation above 16 V risks parametric degradation or latch-up, especially under transient conditions - always observe the 18 V absolute limit during power-up sequencing and fault events in the TLC271BCD design.
How do I configure the bias-select pin for medium-bias operation in a single-supply system?
To configure the TLC271BCD for medium-bias mode in a single-supply system, connect the BIAS SELECT pin (Pin 5) to a voltage equal to VDD/2 using a high-impedance resistive divider (e.g., two 1 MΩ resistors) and a 0.01 µF bypass capacitor. This ensures stable bias point establishment after power-on without excessive current draw - a critical requirement for battery-powered TLC271BCD implementations.
Does the TLC271BCD support true rail-to-rail input operation?
No, the TLC271BCD does not support rail-to-rail input operation. Its common-mode input voltage range extends to –0.2 V below GND (at VDD = 5 V) and up to VDD – 1.5 V, but does not include the positive rail. It does provide rail-to-rail output swing down to GND and within 1.2 V of VDD. This asymmetric input range is explicitly documented in the TLC271BCD datasheet's recommended operating conditions table.
Can the offset null pins (OFFSET N1 and OFFSET N2) be left unconnected in the TLC271BCD?
Yes, the OFFSET N1 (Pin 1) and OFFSET N2 (Pin 8) pins of the TLC271BCD may be left unconnected if factory-calibrated offset performance is sufficient for the application. Leaving them open introduces no functional risk or instability. However, for applications requiring <100 µV residual offset - such as precision weigh scales or laboratory instrumentation - a 10 kΩ potentiometer between these pins and GND is recommended to actively trim the TLC271BCD's input offset voltage.
What is the typical input bias current of the TLC271BCD at 85°C?
The typical input bias current of the TLC271BCD at 85°C is 200 pA, as specified in the electrical characteristics table for the TLC271BI variant (which shares identical silicon with the TLC271BCD but is rated for –40°C to 85°C). This value reflects the worst-case typical drift across temperature and confirms the device's suitability for high-impedance sensor interfaces even in elevated ambient conditions - a key specification verified in the TLC271BCD datasheet revision March 2001.
TLC271BCD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 5.3V/µs
- Gain Bandwidth Product:
- 2.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.7 pA
- Voltage - Input Offset:
- 390 µV
- Current - Supply:
- 950µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TLC271BCD FAQ
1.How can I place an order for TLC271BCD through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC271BCD 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 TLC271BCD reliable?
The price and inventory of TLC271BCD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC271BCD is usually 5 days.
3.What payment methods are accepted for TLC271BCD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC271BCD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC271BCD?
TLC271BCD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC271BCD 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 TLC271BCD?
For technical support, including TLC271BCD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC271BCD requirements.
6.How does Aetrix verify that TLC271BCD is sourced from the original manufacturer or authorized distributors?
All TLC271BCD 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 TLC271BCD meets industry standards.
7.What is the process for return or replacement of TLC271BCD?
All TLC271BCD units undergo pre-shipment inspection (PSI). If there is an issue with TLC271BCD, 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 TLC271BCD part is unused and in its original packaging.
Return procedure for TLC271BCD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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