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Texas Instruments TLC251CPE4
- Part No.:
- TLC251CPE4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TLC251CPE4.pdf
- Description:
- SINGLE, 16-V, 1.7-MHZ, IN TO V-
- Quantity:
- Payment:
- Shipping:
Inventory:1,453
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Product details
Overview
TLC251CPE4 from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin plastic DIP package, designed for single-supply operation from 1.4 V to 16 V with rail-to-rail common-mode input range extending to the negative rail, 10 µA typical supply current in low-bias mode, and software-controllable ac performance via BIAS SELECT pin - ideal for battery-powered sensor front-ends and portable instrumentation.
For engineers reviewing the TLC251CPE4 datasheet, TLC251CPE4 pinout, TLC251CPE4 application, or TLC251CPE4 equivalent, this page delivers verified technical context on its three-programmable bias modes (low/medium/high), LinCMOS™ input stage advantages over bipolar and metal-gate CMOS, offset nulling capability, and ESD-protected design validated per MIL-STD-833C Method 3015.1.
Technical Context
The TLC251CPE4 implements a silicon-gate LinCMOS™ process enabling stable input offset voltage without sacrificing high input impedance (>1012 Ω) or ultra-low input bias current (0.6 pA typ). Its BIAS SELECT pin configures one of three internal current sources, directly setting quiescent supply current (10 µA / 150 µA / 1000 µA typ at VDD = 10 V) and scaling slew rate (0.03–3.6 V/µs), unity-gain bandwidth (65–1700 kHz), and noise (68–25 nV/√Hz).
It supports true single-supply operation with common-mode input range including ground, output swing limited only by load and supply, and internal ESD protection exceeding 2000 V. Offset nulling is implemented externally via two dedicated pins (OFFSET N1/N2) and a 25-kΩ potentiometer referenced to VDD–/GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.4 V to 16 V - enables direct operation from single alkaline, lithium, or solar cells without regulation. |
| Input Offset Voltage (TLC251C) | 10 mV max at 25°C - trimmed via external potentiometer; full-range nulling achievable only in high-bias mode. |
| Supply Current (Low-Bias Mode) | 10 µA typical at VDD = 10 V - extends battery life in always-on monitoring nodes. |
| Input Bias Current | 0.6 pA typical - preserves signal integrity in high-impedance pH, photodiode, or piezoelectric sensor interfaces. |
| Slew Rate (High-Bias Mode) | 3.6 V/µs at VDD = 5 V - supports >100 kHz closed-loop bandwidth in active filters or transimpedance amplifiers. |
| ESD Protection | >2000 V per MIL-STD-833C Method 3015.1 - reduces field failure risk in handheld or industrial environments. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and consumer electronics. |
Pinout & Package
Package: PDIP-8 (Plastic Dual In-line Package), 0.3-inch body width, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFFSET N1) | Offset Null Input 1 | Connects to one end of 25-kΩ potentiometer for input offset trimming; referenced to VDD–/GND (Pin 4). |
| 2 (IN–) | Inverting Input | Differential input node; common-mode range includes VDD–/GND across all bias modes. |
| 3 (IN+) | Non-Inverting Input | Differential input node; supports rail-to-rail input with ultra-high impedance (≥10¹² Ω). |
| 4 (VDD–/GND) | Negative Supply / Ground | Reference node for single-supply operation; internally tied to substrate; must be connected to system ground. |
| 5 (BIAS SELECT) | Bias Configuration Control | Logic-level input: grounded → high bias (1000 µA), VDD/2 → medium bias (150 µA), VDD → low bias (10 µA). |
| 6 (VDD) | Positive Supply | Accepts 1.4–16 V; powers internal LinCMOS™ circuitry and output stage; decoupling recommended. |
| 7 (OUT) | Amplifier Output | Class-AB-like source-follower pull-up + open-drain pull-down; VOH depends on VDD and load, VOL ≈ GND when unloaded. |
| 8 (OFFSET N2) | Offset Null Input 2 | Connects to other end of 25-kΩ potentiometer; wiper ties to Pin 4 (VDD–/GND) for null adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Bias Modes | Three user-selectable operating points (low/medium/high) via single BIAS SELECT pin - enables dynamic power/performance trade-off in firmware-controlled systems. |
| Rail-to-Rail Input Common-Mode Range | Extends to VDD–/GND - eliminates level-shifting requirements in single-supply sensor interfaces and battery-monitoring circuits. |
| External Offset Nulling | Dedicated OFFSET N1/N2 pins support precision DC-coupled applications (e.g., strain gauge bridges) with full trim range in high-bias mode. |
| Ultra-Low Input Bias Current | 0.6 pA typical - minimizes voltage error across high-value feedback resistors (>10 MΩ) and preserves signal fidelity in electrochemical sensors. |
| LinCMOS™ Process Technology | Combines CMOS input impedance with stable offset voltage - avoids drift issues of metal-gate CMOS while eliminating bipolar power penalties. |
Applications
| Portable Gas Sensor Front-End | Low-Power Data Logger Analog Input |
|---|---|
|
Use Scenario: Amplifying microamp-level current from electrochemical gas sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain and ultra-low input bias current to preserve sensor linearity. Use Value: 0.6 pA input bias current prevents significant offset error across 10-MΩ feedback resistor; 10 µA supply current extends 10-year battery life. |
Use Scenario: Conditioning thermistor and humidity sensor outputs in a solar-powered environmental monitor. IC Role / Device Role / Timing Role: Rail-to-rail input buffer and programmable gain stage interfacing to 12-bit SAR ADC. Use Value: Common-mode input range including ground allows direct connection to unbuffered ratiometric sensors; low-bias mode cuts system standby current by >90%. |
| Medical Pulse Oximeter Analog Stage | Industrial Battery Management System |
|
Use Scenario: Amplifying weak AC-coupled photodiode signals in wearable pulse oximeters with strict power budgets. IC Role / Device Role / Timing Role: Low-noise, low-power transimpedance amplifier with selectable bandwidth via BIAS SELECT. Use Value: 25 nV/√Hz input noise (high-bias) ensures clean red/IR signal acquisition; ESD protection >2000 V withstands clinical handling. |
Use Scenario: Monitoring cell voltage and temperature in multi-cell Li-ion packs using microcontroller GPIO-driven analog sensing. IC Role / Device Role / Timing Role: Precision buffer and offset-compensated differential amplifier for high-side current sensing. Use Value: External nulling corrects PCB trace mismatch errors; BIAS SELECT pin enables firmware-triggered high-speed diagnostics during charge cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CP | Fixed low-power design (10 µA), no BIAS SELECT pin; 1.4–16 V supply; 10 mV VIO max; same PDIP-8 package. | Lacks dynamic bias control - suitable only where fixed low-power operation suffices; no software-adjustable bandwidth/speed. | Select when BIAS SELECT functionality is unnecessary and cost sensitivity favors TI's legacy low-power portfolio. |
| LPV821DBVR | Modern rail-to-rail input/output op-amp; 650 nA supply current; 1.6–5.5 V supply; 1.6 mV VIO max; SOT-23-5 package. | Lower VIO and wider supply range but incompatible pinout and no offset null pins; not drop-in replaceable. | Select for new designs prioritizing lowest quiescent current and modern packaging, accepting redesign for nulling and layout. |
Compared with TLC27L2CP and LPV821DBVR, the TLC251CPE4 uniquely provides three discrete bias modes via a single logic pin, external offset nulling, and proven MIL-qualified ESD robustness - making it irreplaceable in legacy-reliant, field-serviceable, or firmware-adaptive analog systems.
Availability
TLC251CPE4 is available at Aetrix Electronics and suitable for portable medical devices, battery-powered environmental sensors, industrial data loggers, and energy-harvesting IoT endpoints requiring stable component supply across extended product lifecycles.
Supply support for TLC251CPE4 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 heritage in precision op-amps and industrial-grade signal conditioning solutions.
The TLC251 family was engineered for ultra-low-power, single-supply analog signal conditioning in battery-constrained and remote-sensing applications - emphasizing programmability, rail-to-rail input, and long-term reliability over raw speed.
FAQ
What is the maximum supply voltage for the TLC251CPE4?
The absolute maximum supply voltage for the TLC251CPE4 is 18 V, though the recommended operating range is 1.4 V to 16 V. Operation above 16 V risks exceeding internal junction limits and may degrade long-term reliability, even if functional in short-term testing. Always observe derating curves in the datasheet for elevated temperature conditions.
Can the TLC251CPE4 operate from a single 1.5-V alkaline cell?
Yes - the TLC251CPE4 is fully specified down to 1.4 V supply and functions at 1.5 V with reduced performance: unity-gain bandwidth drops to ~12 kHz (low-bias), slew rate to 0.001 V/µs, and output swing is limited to ~700 mV peak. It remains stable and usable for ultra-low-power sensor buffering where speed is secondary to energy efficiency.
How does the BIAS SELECT pin affect offset nulling range in the TLC251CPE4?
In the TLC251CPE4, full offset nulling range (to zero) is guaranteed only in high-bias mode (1000 µA). In medium or low-bias modes, or at supply voltages below 4 V, total nulling may not be achievable for all units due to reduced internal current driving the nulling circuit. The datasheet specifies that nulling range scales with bias current.
Is the TLC251CPE4 pin-compatible with other variants like TLC251ACP or TLC251BCP?
Yes - all TLC251xCP variants (C, AC, BC) share identical PDIP-8 pinout, package dimensions, and electrical interface. The only differences are input offset voltage grade (10 mV / 5 mV / 2 mV max) and corresponding test screening; no layout or schematic changes are required when substituting within the same package type.
Does the TLC251CPE4 require external compensation for unity-gain stability?
No - the TLC251CPE4 is internally compensated and stable at unity gain across all bias modes and supply voltages (1.4 V to 16 V). Phase margin remains ≥34° (low-bias) to ≥46° (high-bias) at VDD = 5 V, per datasheet Figures 6–8 and Table on page 13. No external capacitors or feedback networks are needed for basic unity-gain follower operation.
TLC251CPE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 2.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.6 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TLC251CPE4 FAQ
1.How can I place an order for TLC251CPE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC251CPE4 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 TLC251CPE4 reliable?
The price and inventory of TLC251CPE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC251CPE4 is usually 5 days.
3.What payment methods are accepted for TLC251CPE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC251CPE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC251CPE4?
TLC251CPE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC251CPE4 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 TLC251CPE4?
For technical support, including TLC251CPE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC251CPE4 requirements.
6.How does Aetrix verify that TLC251CPE4 is sourced from the original manufacturer or authorized distributors?
All TLC251CPE4 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 TLC251CPE4 meets industry standards.
7.What is the process for return or replacement of TLC251CPE4?
All TLC251CPE4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC251CPE4, 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 TLC251CPE4 part is unused and in its original packaging.
Return procedure for TLC251CPE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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