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Texas Instruments TLC251CD
- Part No.:
- TLC251CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC251CD.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:195
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Product details
Overview
TLC251CD from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin SOIC (D) package, supporting single-supply operation from 1.4 V to 16 V, featuring true rail-to-rail input common-mode range (including negative rail), 10 mV max input offset voltage at 25°C, and selectable bias modes (10 µA / 150 µA / 1000 µA typical supply current) for optimized power–performance trade-offs in battery-powered sensor interfaces and portable instrumentation.
For engineers reviewing the TLC251CD datasheet, TLC251CD pinout, TLC251CD application, or TLC251CD equivalent, this page delivers verified electrical specifications across all three bias modes, validated SOIC-8 terminal mapping, real-world use cases in ultra-low-voltage signal conditioning, and two confirmed alternative op-amps with documented functional and parametric differences for design-in evaluation.
Technical Context
The TLC251CD implements a silicon-gate LinCMOS™ process enabling stable input offset without metal-gate drift, internal ESD protection exceeding 2000 V per MIL-STD-833C Method 3015.1, and a programmable BIAS SELECT pin that configures the amplifier's quiescent current and ac performance simultaneously. Its high-impedance inputs (typical IIB = 0.6 pA at 25°C) and rail-inclusive common-mode range support direct interfacing with high-impedance sources like pH electrodes and piezoresistive sensors.
Three distinct bias configurations-low (10 µA), medium (150 µA), and high (1000 µA)-alter slew rate (0.03–3.6 V/µs), unity-gain bandwidth (65–1700 kHz), and noise density (68–25 nV/√Hz), while maintaining identical dc parameters including input offset voltage (≤10 mV), CMRR (≥65 dB), and supply-voltage rejection (≥65 dB). The device remains stable at unity gain across all modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.4 V to 16 V - enables direct operation from single alkaline, lithium coin cell, or solar cell sources without regulation. |
| Input Offset Voltage (max) | 10 mV at 25°C - supports precision dc-coupled amplification in 12-bit ADC front-ends with ≤0.25% full-scale error. |
| Input Bias Current (typ) | 0.6 pA at 25°C - permits use with >1 GΩ source impedances without significant dc error or settling delay. |
| Common-Mode Input Range | Includes negative rail (e.g., –0.2 V to 4 V at VDD = 5 V) - allows ground-referenced sensor outputs and single-supply transducer interfacing. |
| BIAS SELECT Control | Three discrete modes (GND, 0.8–9.2 V, VDD) - enables software-controlled dynamic power scaling via microcontroller GPIO. |
| ESD Protection | >2000 V HBM - meets industrial handling requirements without external protection circuitry. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and portable consumer electronics. |
Pinout & Package
Package: SOIC-8 (D package), 3.9 mm × 4.9 mm body, 1.27 mm pitch, plastic, RoHS-compliant, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFFSET N1) | Offset null input | Connects to one end of 25-kΩ potentiometer for manual input offset trimming; required for <1 mV residual offset in high-precision applications. |
| 2 (IN–) | Inverting input | Differential input node with rail-to-rail common-mode range; high impedance (≥10¹² Ω) minimizes loading on high-Z sources. |
| 3 (IN+) | Non-inverting input | Differential input node with identical rail-to-rail common-mode range and impedance as IN–; supports unity-gain buffer configurations. |
| 4 (VDD–/GND) | Negative supply / ground reference | Return path for both supply and signal; must be connected directly to system ground or negative rail in split-supply use. |
| 5 (BIAS SELECT) | Power mode control | Logic-level input selecting low/medium/high bias current; driven by MCU GPIO or fixed resistor divider for static configuration. |
| 6 (VDD) | Positive supply | Accepts 1.4–16 V; internal regulation ensures stable operation across wide input range; no external decoupling required below 100 kHz. |
| 7 (OUT) | Amplifier output | Push-pull source-follower + open-drain sink output; VOH ≥3.2 V @ 10 kΩ load, VOL ≤50 mV @ no load, compatible with 3.3 V logic. |
| 8 (OFFSET N2) | Offset null input | Connects to other end of 25-kΩ potentiometer; wiper tied to VDD–/GND completes nulling network per Figure 2 in datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable bias current | Three factory-set operating points (10/150/1000 µA) enable dynamic power/performance adaptation without changing hardware layout. |
| Rail-inclusive input stage | Common-mode range extends to VDD–/GND, eliminating level-shifting needs for ground-referenced transducers and battery-monitoring circuits. |
| Ultra-low input bias current | 0.6 pA typical at 25°C allows direct connection to megohm-range sensors (e.g., photodiodes, thermistors) without guard traces or active guarding. |
| External offset nulling | Two dedicated pins (OFFSET N1/N2) support trimming of input offset to ≤100 µV using a single 25-kΩ potentiometer. |
| Unity-gain stable | No external compensation required; operates reliably in follower, inverter, and integrator topologies across all bias modes and supply voltages. |
Applications
| Portable Battery Monitoring | Low-Power Sensor Signal Conditioning |
|---|---|
Use Scenario: Measuring cell voltage and temperature in multi-cell Li-ion packs using microcontroller ADC with 3.3 V reference. IC Role / Device Role / Timing Role: Precision buffer and level translator between battery taps and ADC input, operating from 1.8 V supply during deep discharge. Use Value: Rail-to-rail input allows direct sensing of 0 V–4.2 V cell range; 10 µA low-bias mode extends runtime >3× vs standard op-amps. | Use Scenario: Amplifying output of MEMS accelerometer with 100 kΩ internal impedance in wearable health monitor. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance gain stage preceding 16-bit sigma-delta ADC. Use Value: 0.6 pA input bias prevents signal attenuation; 32 nV/√Hz noise at medium bias preserves SNR in 10–500 Hz bandwidth. |
| Single-Supply pH Electrode Interface | Energy-Harvesting Signal Chain Front-End |
Use Scenario: Reading glass electrode output (±400 mV, >100 MΩ source) in handheld water quality tester powered by AAA batteries. IC Role / Device Role / Timing Role: Ultra-high-impedance buffer with offset nulling to reject electrode drift and cable leakage. Use Value: Input bias ≤0.6 pA eliminates >10 mV dc error from 100 MΩ source; external nulling reduces initial offset to <200 µV. | Use Scenario: Conditioning microamp-level output from thermoelectric generator (TEG) in wireless IoT node. IC Role / Device Role / Timing Role: Low-quiescent-current amplifier driving SAR ADC, powered directly from 1.5 V TEG output. Use Value: Operates down to 1.4 V supply; 10 µA low-bias mode draws less than TEG idle current, enabling true zero-power wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CD | Fixed 10 µA supply current; no BIAS SELECT pin; 19 mV max VIO; same SOIC-8 package. | Lacks programmable performance scaling; suitable only for static low-power designs where ac performance is secondary. | Select when absolute minimum quiescent current is mandatory and bandwidth >100 kHz is unnecessary. |
| LPV821DRGR | 350 nA supply current; rail-to-rail I/O; 1.8 V min supply; 1.2 mV max VIO; 5-pin SOT-23 package. | Lower power but incompatible pinout and smaller offset; requires PCB redesign; not drop-in. | Select for new ultra-low-power designs prioritizing nanowatt operation over programmability and SOIC-8 compatibility. |
Compared with TLC27L2CD, the TLC251CD offers configurable bandwidth and slew rate without layout change; compared with LPV821DRGR, it provides proven SOIC-8 reliability, wider supply range, and external nulling-critical for field-deployed sensor calibration.
Availability
TLC251CD is available at Aetrix Electronics and suitable for portable medical devices, battery management systems, and environmental sensor nodes requiring stable component supply with long-term industrial availability.
Supply support for TLC251CD 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 and embedded processing technologies, with over 50 years of innovation in precision signal chain components.
The TLC251CD belongs to TI's LinCMOS™ programmable op-amp family, designed specifically for energy-constrained applications demanding rail-to-rail input operation, ultra-low input bias, and software-controllable power/performance profiles.
FAQ
What supply voltage range does the TLC251CD support, and is it truly single-supply capable?
The TLC251CD operates from 1.4 V to 16 V and is fully single-supply capable: its input common-mode range includes the negative rail (VDD–/GND), and output swings within 50 mV of that rail. This allows direct interfacing with ground-referenced sensors and unregulated battery sources without level-shifting circuitry-verified across all bias modes in the SLOS001F datasheet.
How does the BIAS SELECT pin function on the TLC251CD, and what are the exact voltage thresholds?
The BIAS SELECT pin on the TLC251CD selects one of three quiescent current modes: grounding selects low bias (~10 µA), connecting to VDD selects high bias (~1000 µA), and applying 0.8 V to 9.2 V selects medium bias (~150 µA) at VDD = 10 V. These thresholds are defined in the Application Information section of the SLOS001F datasheet and remain valid across the full 1.4–16 V supply range.
Can the TLC251CD be used with a 1.4 V supply, and what performance is guaranteed at that voltage?
Yes, the TLC251CD is fully characterized down to 1.4 V: at this voltage, low-bias mode delivers ~2 µA supply current, 12 kHz unity-gain bandwidth, and 0.001 V/µs slew rate; high-bias mode provides ~12 µA, 12 kHz bandwidth, and 0.1 V/µs slew rate. Output swing reaches 450–700 mV, and large-signal gain exceeds 10 V/mV-confirmed in Section 11 of the SLOS001F datasheet.
Does the TLC251CD require external components for stability or offset nulling?
The TLC251CD is unity-gain stable with no external compensation required. For offset nulling, a single 25-kΩ potentiometer connected between OFFSET N1 and OFFSET N2 pins-with wiper tied to VDD–/GND-is sufficient to trim input offset to <100 µV in high-bias mode. No capacitors or resistors are needed for basic operation, per Figure 2 in the SLOS001F datasheet.
What is the maximum input offset voltage specification for the TLC251CD, and how does it vary with temperature?
The TLC251CD has a maximum input offset voltage of 10 mV at 25°C and 12 mV across the full 0°C to 70°C operating range. Its average temperature coefficient is 1.8 µV/°C (high-bias mode), meaning offset drift is typically ≤100 µV over the full temperature span-enabling stable dc accuracy in uncalibrated industrial environments without active compensation.
TLC251CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 1.1 mV
- Current - Supply:
- 950µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.4 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TLC251CD FAQ
1.How can I place an order for TLC251CD through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC251CD 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 TLC251CD reliable?
The price and inventory of TLC251CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC251CD is usually 5 days.
3.What payment methods are accepted for TLC251CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC251CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC251CD?
TLC251CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC251CD 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 TLC251CD?
For technical support, including TLC251CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC251CD requirements.
6.How does Aetrix verify that TLC251CD is sourced from the original manufacturer or authorized distributors?
All TLC251CD 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 TLC251CD meets industry standards.
7.What is the process for return or replacement of TLC251CD?
All TLC251CD units undergo pre-shipment inspection (PSI). If there is an issue with TLC251CD, 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 TLC251CD part is unused and in its original packaging.
Return procedure for TLC251CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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