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Texas Instruments TLC251CPSR
- Part No.:
- TLC251CPSR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
TLC251CPSR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
TLC251CPSR from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin SOIC package, supporting true single-supply operation from 1.4 V to 16 V, featuring rail-to-rail common-mode input range (down to negative rail), 30 nV/√Hz typical input noise at 1 kHz (high-bias mode), and software-controllable bias-select pin enabling three power/performance modes (10 µA / 150 µA / 1000 µA typical IDD). It is used in battery-powered sensor front-ends and portable instrumentation requiring precision, ultra-low quiescent current, and offset nulling capability.
For engineers reviewing the TLC251CPSR datasheet, TLC251CPSR pinout, TLC251CPSR application, or TLC251CPSR equivalent, key selection criteria include its programmable bias-select interface, guaranteed 0°C to 70°C operating range, 2 mV max input offset voltage (TLC251BC grade), internal ESD protection (>2000 V per MIL-STD-833C), and compatibility with single-cell Li-ion, alkaline, or solar cell power sources.
Technical Context
The TLC251CPSR implements a silicon-gate LinCMOS™ process, eliminating metal-gate CMOS instability while retaining ultra-high input impedance (>10¹² Ω) and sub-picoampere input bias currents (0.6 pA typ at 25°C). Its BIAS SELECT pin directly controls the internal current source, switching between low-, medium-, and high-bias operating points - each with distinct slew rate (0.03–3.6 V/µs), unity-gain bandwidth (65–1700 kHz), and noise (68–25 nV/√Hz) trade-offs.
This architecture enables dynamic performance scaling: microprocessor-driven logic-level control of BIAS SELECT allows real-time adaptation of ac response and power consumption without hardware changes. The device remains stable at unity gain and supports external offset nulling via two dedicated pins (OFFSET N1/N2), with full nulling achievable only in high-bias mode due to increased transconductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.4 V to 16 V - enables direct operation from single AA/AAA, Li-ion, or 12-V industrial rails without regulation. |
| Input Offset Voltage (max) | 2 mV at 25°C (TLC251BC grade) - ensures <±1 mV error in 12-bit ADC front-ends with gain ≤500. |
| Supply Current (typ) | 10 µA / 150 µA / 1000 µA - selectable via BIAS SELECT for energy-constrained wake-up or high-speed burst modes. |
| Input Bias Current (typ) | 0.6 pA at 25°C - preserves signal integrity in >100 MΩ sensor interfaces (e.g., pH electrodes, photodiode TIA). |
| Common-Mode Input Range | Includes negative rail (GND) - supports ground-referenced single-supply sensing without level-shifting circuitry. |
| ESD Protection | >2000 V per MIL-STD-833C Method 3015.1 - reduces need for external TVS in handheld or field-deployed equipment. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, not extended industrial or automotive. |
Pinout & Package
Package: 8-pin SOIC (D), 150 mil width, RoHS-compliant, NIPDAU lead finish, MSL Level-1 (260°C peak reflow, unlimited floor life).
| 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; functional only in high-bias mode. |
| 2 (IN–) | Inverting Input | Differential input node; supports rail-to-rail common-mode range including GND. |
| 3 (IN+) | Non-Inverting Input | Differential input node; identical common-mode range and impedance as IN–. |
| 4 (VDD–/GND) | Negative Supply / Ground | Reference return for single-supply operation; internally tied to substrate backside in chip form. |
| 5 (BIAS SELECT) | Bias Programming Input | Logic-controlled terminal: grounded = high bias (1000 µA), VDD/2 = medium (150 µA), VDD = low bias (10 µA). |
| 6 (VDD) | Positive Supply | Accepts 1.4–16 V; no reverse polarity protection; must be applied before input signals to avoid latch-up. |
| 7 (OUT) | Amplifier Output | Source-follower pull-up + open-drain pull-down; VOH depends on load and VDD; VOL ≈ GND under no load. |
| 8 (OFFSET N2) | Offset Null Input | Connects to other end of 25-kΩ potentiometer; wiper ties to VDD–/GND for nulling circuit completion. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Bias Select | Three discrete IDD states enable runtime trade-off between quiescent current (10 µA) and slew rate (3.6 V/µs) without changing hardware. |
| Rail-to-Rail Input Common-Mode | Operates with inputs down to VDD–/GND, eliminating level-shifters in single-supply sensor amplifiers and battery-monitoring circuits. |
| External Offset Nulling | Dedicated OFFSET N1/N2 pins support 25-kΩ potentiometer-based trimming, achieving zero residual offset in high-bias configuration. |
| Ultra-Low Input Bias Current | 0.6 pA typical at 25°C enables use with high-impedance sources (e.g., piezoelectric sensors, ion-selective electrodes) without signal degradation. |
| Single-Supply Optimized Architecture | No dual-rail requirement; output swing reaches within ~50 mV of GND and within ~200 mV of VDD at light loads, simplifying power design. |
Applications
| Portable Medical Sensors | Remote Environmental Monitoring |
|---|---|
Use Scenario: Amplifying weak analog signals from disposable glucose or ECG electrodes in battery-powered handheld devices. IC Role / Device Role / Timing Role: Precision front-end op-amp providing gain, filtering, and offset correction prior to 12-bit SAR ADC sampling. Use Value: 2 mV max VIO and 0.6 pA IIB prevent baseline drift and leakage-induced errors in µA-level bio-signals; 10 µA low-bias mode extends battery life beyond 1 year. | Use Scenario: Signal conditioning for soil moisture, temperature, and gas sensors deployed in unattended field nodes powered by solar cells. IC Role / Device Role / Timing Role: Low-power transducer interface amplifier with programmable gain and offset compensation across wide temperature ranges. Use Value: 1.4 V minimum supply enables direct harvesting from small solar panels; BIAS SELECT allows sleep-mode current reduction to 10 µA during idle intervals. |
| Industrial Battery Management | Low-Power Data Acquisition Modules |
Use Scenario: Cell voltage monitoring and balancing feedback in multi-cell Li-ion packs for UPS and portable tools. IC Role / Device Role / Timing Role: High-impedance differential amplifier measuring individual cell voltages referenced to pack ground. Use Value: Rail-to-rail input range captures full 0–4.2 V cell voltage without external biasing; 2000 V ESD rating protects against handling damage during assembly and field service. | Use Scenario: Analog front-end for modular DAQ systems where channel count, accuracy, and power budget are tightly constrained. IC Role / Device Role / Timing Role: Configurable gain stage with external nulling for calibrated sensor inputs across multiple measurement ranges. Use Value: Three bias modes allow matching amplifier performance to sampling rate requirements: low-bias for 10 Hz logging, high-bias for 10 kHz transient capture. |
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 |
|---|---|---|---|
| TLC27L2CPSR | Fixed low-power design (10 µA typ), no BIAS SELECT pin; 1.4–16 V supply; 10 mV max VIO (C-grade); same SOIC-8 package. | Lacks dynamic bias control - suitable only for static low-power use cases without performance scaling needs. | Select when absolute minimum quiescent current is required and ac performance is secondary; not interchangeable for BIAS SELECT functionality. |
| LPV821DRVR | Modern nanopower op-amp (320 nA typ), rail-to-rail I/O, 1.6–5.5 V supply; no offset null pins; 1.6 mV max VIO; 5-pin SOT-23 package. | Lower power but narrower supply range and no external nulling - best for space-constrained, ultra-low-IDD designs without precision trimming. | Choose for new designs prioritizing PCB area and sub-µA operation; requires layout change and lacks nulling capability for legacy calibration workflows. |
Compared with TLC27L2CPSR and LPV821DRVR, the TLC251CPSR uniquely combines programmable bias control, external offset nulling, and 1.4 V operation in a standard SOIC-8 footprint - making it irreplaceable in legacy-calibrated, multi-mode portable instrumentation where both precision and adaptive power management are mandatory.
Availability
TLC251CPSR is available at Aetrix Electronics and suitable for portable medical sensors, remote environmental monitoring, and industrial battery management requiring stable component supply across long-lifecycle programs.
Supply support for TLC251CPSR 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 90 years of innovation in precision analog ICs and power management solutions.
The TLC251CPSR belongs to TI's LinCMOS™ programmable op-amp product line, designed specifically for energy-constrained, single-supply applications demanding configurable performance, rail-to-rail input operation, and field-serviceable offset calibration.
FAQ
What is the maximum supply voltage for the TLC251CPSR?
The absolute maximum supply voltage for the TLC251CPSR is 18 V, but the recommended operating range is 1.4 V to 16 V. Operation above 16 V risks exceeding safe dissipation limits and may degrade long-term reliability, especially at elevated temperatures. The device is optimized for low-voltage battery operation, with full functionality guaranteed down to 1.4 V - enabling direct use with single alkaline or lithium coin cells.
How does the BIAS SELECT pin affect the performance of the TLC251CPSR?
The BIAS SELECT pin on the TLC251CPSR determines the internal bias current, selecting among three distinct operating modes: low-bias (10 µA typ), medium-bias (150 µA typ), and high-bias (1000 µA typ). This directly scales ac performance - slew rate ranges from 0.03 V/µs (low) to 3.6 V/µs (high), and unity-gain bandwidth from 65 kHz to 1.7 MHz. The TLC251CPSR maintains dc specifications (e.g., input offset, CMRR) across all modes, enabling dynamic adaptation without recalibration.
Can the TLC251CPSR be used with a single 1.5-V alkaline battery?
Yes, the TLC251CPSR is fully specified to operate from 1.4 V, making it compatible with a fresh 1.5-V alkaline battery. At 1.4 V, the device delivers usable performance in low-bias mode: 12 kHz unity-gain bandwidth, 0.001 V/µs slew rate, and 700 mV peak output swing. Input offset voltage remains within 10 mV (TLC251C grade), and supply current stays below 17 µA - enabling multi-year operation in intermittent-sampling applications such as wireless sensor nodes.
Does the TLC251CPSR require external components for offset nulling?
Yes, the TLC251CPSR requires an external 25-kΩ potentiometer connected between pins 1 (OFFSET N1) and 8 (OFFSET N2), with the wiper tied to pin 4 (VDD–/GND), to perform input offset nulling. Full nulling to zero is only guaranteed in high-bias mode (1000 µA), as lower bias currents reduce transconductance and limit adjustment range. The TLC251CPSR datasheet provides Figure 2 as the exact nulling circuit configuration, and no capacitor or resistor beyond the potentiometer is needed.
Is the TLC251CPSR pin-compatible with other devices in the TLC251 family?
Yes, the TLC251CPSR is pin-compatible with all members of the TLC251 family in the SOIC-8 (D) package, including TLC251ACPSR and TLC251BCPSR. All share identical pinout, footprint, and electrical interface - differing only in input offset voltage grade (10 mV / 5 mV / 2 mV max) and minor parameter distributions. This allows drop-in replacement during design iteration or cost optimization without PCB revision, provided the selected grade meets system accuracy requirements.
TLC251CPSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SO
TLC251CPSR FAQ
1.How can I place an order for TLC251CPSR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC251CPSR 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 TLC251CPSR reliable?
The price and inventory of TLC251CPSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC251CPSR is usually 5 days.
3.What payment methods are accepted for TLC251CPSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC251CPSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC251CPSR?
TLC251CPSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC251CPSR 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 TLC251CPSR?
For technical support, including TLC251CPSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC251CPSR requirements.
6.How does Aetrix verify that TLC251CPSR is sourced from the original manufacturer or authorized distributors?
All TLC251CPSR 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 TLC251CPSR meets industry standards.
7.What is the process for return or replacement of TLC251CPSR?
All TLC251CPSR units undergo pre-shipment inspection (PSI). If there is an issue with TLC251CPSR, 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 TLC251CPSR part is unused and in its original packaging.
Return procedure for TLC251CPSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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