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Texas Instruments TLC251ACP
- Part No.:
- TLC251ACP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TLC251ACP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,864
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Product details
Overview
TLC251ACP 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 input common-mode range extending to the negative rail, 5 mV max input offset voltage at 25°C, and selectable bias modes (10 µA / 150 µA / 1000 µA typical supply current) enabling trade-offs between power and AC performance.
For engineers reviewing the TLC251ACP datasheet, TLC251ACP pinout, TLC251ACP application, or TLC251ACP equivalent, this device is critical for ultra-low-power sensor interfaces, battery-powered instrumentation, and microcontroller-based analog front-ends where software-controllable gain-bandwidth-noise-power balance is required.
Technical Context
The TLC251ACP uses Texas Instruments' silicon-gate LinCMOS™ process to deliver stable input offset voltage without metal-gate CMOS drift, while supporting true single-supply operation down to 1.4 V. Its BIAS SELECT pin configures three distinct operating modes-low-bias (10 µA), medium-bias (150 µA), and high-bias (1000 µA)-each with validated slew rate, unity-gain bandwidth, and noise performance.
Input stage features extremely high impedance (typical IIB = 0.6 pA at 25°C) and ESD protection exceeding 2000 V per MIL-STD-833C Method 3015.1. The output stage employs a source-follower pull-up and open-drain pull-down, delivering VOH up to 4.1 V and VOL as low as 0 mV (no load) at VDD = 5 V.
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) | 5 mV at 25°C - supports precision DC-coupled amplification in low-gain sensor signal chains. |
| Supply Current (typ) | 10 µA / 150 µA / 1000 µA - three user-selectable bias modes via BIAS SELECT pin for dynamic power/performance tuning. |
| Unity-Gain Bandwidth (typ) | 65 kHz (low-bias) / 525 kHz (medium-bias) / 1.7 MHz (high-bias) - scalable small-signal response matching application bandwidth needs. |
| Input Bias Current (typ) | 0.6 pA at 25°C - preserves signal integrity in high-impedance pH, photodiode, or piezoelectric sensor interfaces. |
| Common-Mode Input Range | Includes negative rail (to GND) - allows ground-referenced input signals without level-shifting circuitry. |
| ESD Protection | >2000 V per MIL-STD-833C Method 3015.1 - enhances reliability in handling and field-deployed equipment. |
Pinout & Package
Package: Plastic DIP (P), 8-pin, through-hole mounting. RoHS-compliant, lead finish NIPDAU, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFFSET N1) | Offset null input | Connects to one end of 25-kΩ potentiometer for external input offset trimming. |
| 2 (IN–) | Inverting input | Differential input node; common-mode range extends to VDD–/GND. |
| 3 (IN+) | Non-inverting input | Differential input node; supports rail-to-rail common-mode operation. |
| 4 (VDD–/GND) | Negative supply / ground | Reference return for single-supply operation; internal connection point for offset null wiper. |
| 5 (BIAS SELECT) | Bias mode control | Logic-level input: grounded = high-bias (~1000 µA), VDD = low-bias (~10 µA), mid-voltage = medium-bias (~150 µA). |
| 6 (VDD) | Positive supply | Accepts 1.4 V–16 V; powers all internal circuitry including ESD protection network. |
| 7 (OUT) | Amplifier output | Source-follower + open-drain output; VOH ≥ 3.2 V, VOL ≤ 50 mV (RL = 10 kΩ, VDD = 5 V). |
| 8 (OFFSET N2) | Offset null input | Connects to other end of 25-kΩ potentiometer; wiper ties to Pin 4 (VDD–/GND). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable bias modes | Three discrete IDD settings (10/150/1000 µA) enable real-time software-controlled optimization of power vs. bandwidth/noise. |
| Rail-to-rail input common-mode | Operates with inputs at VDD–/GND, eliminating need for input biasing resistors in single-supply transducer interfaces. |
| Ultra-low input bias current | 0.6 pA typical at 25°C ensures minimal loading error in >1 GΩ sensor circuits like electrochemical or capacitive sensors. |
| External offset null capability | Two dedicated pins (OFFSET N1/N2) support full trim of input offset voltage using a single 25-kΩ potentiometer. |
| Low-voltage operation | Functional at 1.4 V supply enables direct integration with energy-harvesting systems and long-life primary batteries. |
Applications
| Portable Medical Sensors | Remote Environmental Monitors |
|---|---|
Use Scenario: Amplifying low-level signals from thermistor, pH, or dissolved oxygen sensors in handheld diagnostic tools powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioning amplifier with rail-to-rail input and programmable low-power mode. Use Value: Enables 5+ year battery life via 10 µA low-bias mode while maintaining sufficient bandwidth (65 kHz) for slow-sampling biosensors. |
Use Scenario: Signal conditioning in solar-powered soil moisture or air quality nodes deployed in unattended outdoor locations. IC Role / Device Role / Timing Role: Low-voltage analog front-end amplifier interfacing with microcontroller ADC inputs. Use Value: Operates directly from 1.8–3.6 V harvested solar output without LDO, reducing system component count and quiescent loss. |
| Industrial Process Controllers | IoT Edge Node Analog Front-Ends |
Use Scenario: Isolated 4–20 mA loop receiver with cold-junction compensation in PLC analog input modules. IC Role / Device Role / Timing Role: High-impedance buffer and gain stage preceding precision ADC and digital isolation. Use Value: 0.6 pA input bias current prevents voltage drop across high-value series resistors used in intrinsic safety barriers. |
Use Scenario: Multi-channel sensor hub aggregating temperature, humidity, and motion data in battery-operated smart building nodes. IC Role / Device Role / Timing Role: Configurable gain/offset amplifier for each sensor channel, controlled via MCU GPIO on BIAS SELECT. Use Value: Single-part flexibility reduces BOM count: one TLC251ACP replaces multiple fixed-performance op-amps across varying sensor bandwidths. |
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 |
|---|---|---|---|
| TLC27L2CP | Fixed low-power design (19 µA typ), no BIAS SELECT pin; 1.4 V–16 V supply; 10 mV VIO max; SOIC/DIP available. | Lacks dynamic bias control - suitable only for static low-power use cases without runtime performance adjustment. | Select when BIAS SELECT functionality is unnecessary and lower cost is prioritized over configurability. |
| LPV821DBVR | Modern rail-to-rail input/output op-amp; 650 nA supply current; 1.7 V–5.5 V supply; 1.6 mV VIO max; SOT-23-5 package. | Lower voltage range and smaller package limit use in 9–16 V industrial or legacy 5 V systems; no offset null pins. | Select for new ultra-low-power designs below 5.5 V where PCB space is constrained and external nulling is not required. |
Compared with TLC251ACP, TLC27L2CP offers lower unit cost but eliminates software-controllable performance scaling, while LPV821DBVR delivers superior input offset and lower quiescent current but sacrifices supply voltage flexibility, offset trimming, and through-hole packaging compatibility.
Availability
TLC251ACP is available at Aetrix Electronics and suitable for portable medical sensors, remote environmental monitors, and industrial process controllers requiring stable component supply across extended product lifecycles.
Supply support for TLC251ACP 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 op-amps and low-power signal conditioning.
The TLC251 family was engineered for energy-constrained, single-supply applications demanding programmable trade-offs between speed, noise, and quiescent current - particularly in battery-powered instrumentation and distributed sensing.
FAQ
What is the maximum supply voltage rating for the TLC251ACP?
The absolute maximum supply voltage for the TLC251ACP is 18 V, as specified in the Absolute Maximum Ratings table. Operation above 16 V is not recommended for reliable long-term performance, and the device is characterized for normal operation from 1.4 V to 16 V. Exceeding 18 V may cause permanent damage to the TLC251ACP.
How does the BIAS SELECT pin configure operating modes on the TLC251ACP?
The BIAS SELECT pin on the TLC251ACP sets one of three supply current modes: grounding the pin selects high-bias mode (~1000 µA), connecting it to VDD selects low-bias mode (~10 µA), and applying a mid-supply voltage (e.g., VDD/2) selects medium-bias mode (~150 µA). This configuration directly scales slew rate, unity-gain bandwidth, and input noise - for example, high-bias yields 1.7 MHz GBW, while low-bias provides 65 kHz GBW with 10 µA IDD.
Can the TLC251ACP be used with dual supplies?
Yes, the TLC251ACP can be operated from split supplies (e.g., ±5 V) provided the input common-mode voltage, output swing, and absolute supply voltage limits are respected. Its common-mode input range extends to the negative rail, and the device maintains stability and specified performance under dual-supply conditions - though it is optimized and fully characterized for single-supply use from 1.4 V to 16 V.
Does the TLC251ACP include internal ESD protection?
Yes, the TLC251ACP incorporates internal electrostatic discharge (ESD) protection circuits that meet or exceed 2000 V per MIL-STD-833C, Method 3015.1. This protection safeguards against catastrophic failure during handling and assembly, though care must still be taken to avoid repeated ESD exposure, which may degrade parametric performance over time.
What is the purpose of the OFFSET N1 and OFFSET N2 pins on the TLC251ACP?
The OFFSET N1 and OFFSET N2 pins on the TLC251ACP provide access to the internal input offset voltage nulling network. Connecting a 25-kΩ potentiometer between these pins-with its wiper tied to Pin 4 (VDD–/GND)-allows precise external trimming of input offset voltage. Full nulling is guaranteed in high-bias mode; effectiveness decreases in low- or medium-bias modes or at supply voltages below 4 V.
TLC251ACP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 900 µV
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TLC251ACP FAQ
1.How can I place an order for TLC251ACP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC251ACP 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 TLC251ACP reliable?
The price and inventory of TLC251ACP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC251ACP is usually 5 days.
3.What payment methods are accepted for TLC251ACP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC251ACP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC251ACP?
TLC251ACP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC251ACP 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 TLC251ACP?
For technical support, including TLC251ACP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC251ACP requirements.
6.How does Aetrix verify that TLC251ACP is sourced from the original manufacturer or authorized distributors?
All TLC251ACP 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 TLC251ACP meets industry standards.
7.What is the process for return or replacement of TLC251ACP?
All TLC251ACP units undergo pre-shipment inspection (PSI). If there is an issue with TLC251ACP, 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 TLC251ACP part is unused and in its original packaging.
Return procedure for TLC251ACP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC251ACP Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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