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Texas Instruments TLC251CDG4
- Part No.:
- TLC251CDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC251CDG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,755
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Product details
Overview
TLC251CDG4 from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin SOIC (D) package, designed for single-supply operation from 1.4 V to 16 V with true rail-to-rail input common-mode range extending to the negative rail. It delivers selectable ac performance via BIAS SELECT pin, supports 10 µA (low), 150 µA (medium), or 1000 µA (high) supply current modes, and features 10 mV max input offset voltage at 25°C - ideal for battery-powered sensor front-ends and portable instrumentation.
For engineers reviewing the TLC251CDG4 datasheet, TLC251CDG4 pinout, TLC251CDG4 application, or TLC251CDG4 equivalent, this device offers verified programmable bias control, LinCMOS™ input stage advantages (ultra-low input bias current ≤60 pA), ESD protection >2000 V per MIL-STD-833C, and stable unity-gain operation down to 1.4 V - critical for ultra-low-voltage energy harvesting and remote sensing designs.
Technical Context
The TLC251CDG4 implements a silicon-gate LinCMOS™ process enabling stable input offset without metal-gate drift, while retaining CMOS input impedance (>1012 Ω) and sub-picoampere input bias currents. Its three-bias architecture uses a dedicated BIAS SELECT terminal to configure internal current mirrors, directly scaling slew rate (0.03–3.6 V/µs), unity-gain bandwidth (65–1700 kHz), and noise (68–25 nV/√Hz) across operating modes.
Input common-mode range includes the negative rail (VICR = –0.2 V to VDD–0.2 V at 5 V), output stage uses source-follower pull-up + open-drain pull-down topology, and offset nulling is supported via external 25-kΩ potentiometer between OFFSET N1/N2 pins - all validated for 0°C to 70°C industrial temperature operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.4 V to 16 V - enables direct use with single Li-ion, alkaline, or solar cell sources without regulation. |
| Input Offset Voltage (max) | 10 mV at 25°C - specified for TLC251C grade; allows precision dc-coupled amplification in low-gain signal chains. |
| Supply Current (selectable) | 10 µA / 150 µA / 1000 µA - software-controllable power/performance trade-off via logic-level BIAS SELECT input. |
| Input Bias Current (typ) | 0.6 pA at 25°C - enables high-impedance transducer interfacing (e.g., pH electrodes, piezoresistive sensors) without significant error. |
| Slew Rate (high-bias) | 3.6 V/µs at VDD = 5 V - sufficient for 100-kHz small-signal amplification with <1% distortion in portable audio paths. |
| ESD Protection | >2000 V per MIL-STD-833C, Method 3015.1 - ensures robustness during board handling and field deployment. |
| Unity-Gain Bandwidth (high) | 1.7 MHz at VDD = 5 V - supports stable closed-loop gain ≥1 with capacitive loads ≤20 pF. |
Pinout & Package
Package: 8-pin SOIC (D), 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFFSET N1) | Offset Null Input 1 | Connects to one end of 25-kΩ potentiometer for manual input offset trimming; wiper ties to GND. |
| 2 (IN–) | Inverting Input | Differential input node with common-mode range including negative rail; input bias current ≤60 pA. |
| 3 (IN+) | Non-Inverting Input | Differential input node; identical electrical specs to IN–; supports true single-supply sensor biasing. |
| 4 (VDD–/GND) | Negative Supply / Ground | Reference return for both supply and signal; common-mode input extends to this pin voltage. |
| 5 (BIAS SELECT) | Bias Mode Control | Logic-level input: tie to GND (high bias), VDD/2 (medium), or VDD (low) to select 1000/150/10 µA IDD. |
| 6 (VDD) | Positive Supply | Accepts 1.4–16 V; internal regulation not required; power rejection ratio ≥65 dB up to 10 V. |
| 7 (OUT) | Amplifier Output | Source-follower pull-up + open-drain pull-down; VOH ≥3.2 V @ 10 kΩ load, VOL ≤50 mV @ no load. |
| 8 (OFFSET N2) | Offset Null Input 2 | Connects to other end of 25-kΩ potentiometer; completes external nulling circuit per Figure 2. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Bias Architecture | Three discrete IDD modes (10/150/1000 µA) selected via single logic input - enables dynamic power scaling in microcontroller-driven systems. |
| True Single-Supply Input Stage | Common-mode input range includes VDD–/GND - eliminates level-shifting circuitry when amplifying ground-referenced sensors. |
| LinCMOS™ Process Technology | Stable input offset voltage without metal-gate drift; achieves <60 pA input bias current while maintaining CMOS input impedance. |
| External Offset Nulling | Two dedicated pins (OFFSET N1/N2) support 25-kΩ potentiometer-based trimming - restores precision in low-gain, high-accuracy applications. |
| Ultra-Low-Voltage Operation | Functional at 1.4 V supply - enables direct interface with emerging energy-harvesting sources (e.g., thermoelectric, RF, or photovoltaic). |
Applications
| Portable Gas Sensor Interface | Low-Power Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying microamp-level current from electrochemical gas sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Transimpedance amplifier with rail-to-rail input and programmable low-bias mode (10 µA IDD) to extend battery life. Use Value: Enables >5-year operation on CR2032 via 10 µA quiescent current while maintaining 10-mV offset accuracy for ppm-level gas detection. |
Use Scenario: Conditioning analog outputs from MEMS accelerometers and temperature sensors in wireless IoT nodes. IC Role / Device Role / Timing Role: Programmable gain stage with BIAS SELECT controlled by MCU GPIO to match signal amplitude to ADC input range. Use Value: Reduces system power by 90% vs fixed-high-speed op-amps during sleep cycles, with seamless wake-up performance recovery. |
| Solar-Powered Environmental Monitor | Remote Industrial Pressure Transmitter |
Use Scenario: Signal conditioning for piezoresistive pressure sensors in off-grid weather stations powered by small solar panels. IC Role / Device Role / Timing Role: Low-noise (25 nV/√Hz), high-input-impedance buffer operating from 1.8–3.3 V unregulated solar input. Use Value: Eliminates LDO requirement, reducing bill-of-materials cost and startup voltage threshold below 2 V. |
Use Scenario: Isolated 4–20 mA loop transmitter front-end where long cable runs demand high CMRR and low input bias. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage with 85 dB CMRR and 0.6 pA input bias current. Use Value: Prevents leakage-induced zero-shift errors in high-impedance bridge circuits over 100-m cable lengths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CD | Fixed low-power design (10 µA typ), no BIAS SELECT pin; 25 mV VIO max; same SOIC-8 package. | Lacks programmable ac performance - suitable only for static ultra-low-power apps where bandwidth >100 kHz is unnecessary. | Select when absolute minimum quiescent current is mandatory and variable speed is not required. |
| LPV821DR | Modern nanopower op-amp (320 nA IDD), rail-to-rail I/O, but no offset null pins or BIAS SELECT; 1.8–5.5 V range only. | Cannot operate below 1.8 V or above 5.5 V; lacks external nulling capability for precision calibration. | Select for sub-1-µA battery life in 3.3 V systems where offset drift tolerance exceeds ±1 mV. |
Compared with TLC27L2CD and LPV821DR, the TLC251CDG4 uniquely combines 1.4–16 V operation, three-tier programmable bias, external offset nulling, and MIL-grade ESD - making it the only option for calibrated, wide-supply, field-deployable analog front-ends requiring both longevity and adaptability.
Availability
TLC251CDG4 is available at Aetrix Electronics and suitable for portable medical monitors, solar-powered environmental sensors, and remote industrial transmitters requiring stable component supply across extended temperature and voltage ranges.
Supply support for TLC251CDG4 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 decades of expertise in precision amplifiers and low-power design.
The TLC251 family was engineered for energy-constrained, single-supply systems requiring programmable performance - targeting battery-operated instrumentation, remote sensing, and portable measurement equipment.
FAQ
What supply voltage range does the TLC251CDG4 support, and is it truly single-supply capable?
The TLC251CDG4 operates from 1.4 V to 16 V and is explicitly characterized for true single-supply operation. Its input common-mode voltage range includes the negative rail (VDD–/GND), allowing inputs down to 0 V - confirmed in the Recommended Operating Conditions table (VICR = –0.2 V to VDD–0.2 V at 5 V). This eliminates need for level-shifting in ground-referenced sensor interfaces.
How does the BIAS SELECT pin function on the TLC251CDG4, and what are the exact IDD values it controls?
The BIAS SELECT pin on the TLC251CDG4 selects among three factory-characterized bias modes: grounding the pin enables high-bias mode (1000 µA typical IDD), connecting to VDD/2 enables medium-bias (150 µA), and tying to VDD enables low-bias (10 µA) - all verified in the Electrical Characteristics tables for VDD = 5 V and 10 V. These settings directly scale slew rate, bandwidth, and noise.
Does the TLC251CDG4 support external input offset nulling, and how is it implemented?
Yes, the TLC251CDG4 provides two dedicated offset null terminals (pins 1 and 8: OFFSET N1 and OFFSET N2). As shown in Figure 2 of the datasheet, a 25-kΩ potentiometer is connected between them with its wiper tied to VDD–/GND. This configuration allows trimming of input offset voltage to near-zero - especially effective in high-bias mode where full nulling range covers the 10 mV max specification.
What is the maximum input offset voltage specification for the TLC251CDG4, and over what temperature range is it guaranteed?
The TLC251CDG4 (C-grade) has a maximum input offset voltage of 10 mV at 25°C and 12 mV over the full 0°C to 70°C operating range - explicitly stated in the "Available Options" table and Electrical Characteristics section. This specification applies to the TLC251C variant, which matches the CDG4 suffix indicating SOIC-8 packaging and commercial temperature grade.
Is the TLC251CDG4 pin-compatible with other devices in the TLC251 family, such as TLC251ACD or TLC251BCD?
Yes, all TLC251x variants (TLC251CDG4, TLC251ACD, TLC251BCD) share identical 8-pin SOIC (D) package, pinout, and functional block diagram. Differences are limited to input offset voltage grading (10 mV / 5 mV / 2 mV max) and minor parameter shifts - confirmed in the "AVAILABLE OPTIONS" table and Electrical Characteristics sections. No PCB redesign is needed when upgrading within the family.
TLC251CDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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
TLC251CDG4 FAQ
1.How can I place an order for TLC251CDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC251CDG4 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 TLC251CDG4 reliable?
The price and inventory of TLC251CDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC251CDG4 is usually 5 days.
3.What payment methods are accepted for TLC251CDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC251CDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC251CDG4?
TLC251CDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC251CDG4 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 TLC251CDG4?
For technical support, including TLC251CDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC251CDG4 requirements.
6.How does Aetrix verify that TLC251CDG4 is sourced from the original manufacturer or authorized distributors?
All TLC251CDG4 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 TLC251CDG4 meets industry standards.
7.What is the process for return or replacement of TLC251CDG4?
All TLC251CDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC251CDG4, 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 TLC251CDG4 part is unused and in its original packaging.
Return procedure for TLC251CDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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