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Texas Instruments TLC251BCP
- Part No.:
- TLC251BCP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TLC251BCP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,401
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Product details
Overview
TLC251BCP from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin plastic DIP package, featuring true single-supply operation down to 1.4 V, input offset voltage ≤2 mV (max at 25°C), and selectable high/medium/low bias modes for dynamic power–performance trade-off. It delivers 3.6 V/µs slew rate (high-bias, VDD = 5 V), 1.7 MHz unity-gain bandwidth, and rail-to-rail input common-mode range extending to the negative rail - ideal for battery-powered sensor front-ends and portable instrumentation.
For engineers reviewing the TLC251BCP datasheet, TLC251BCP pinout, TLC251BCP application, or TLC251BCP equivalent, this page provides verified pin functions, real-world operating conditions across all three bias modes, confirmed ESD protection (>2000 V per MIL-STD-833C), exact input offset nulling circuit requirements, and validated alternatives with documented performance deltas in supply current, bandwidth, and noise.
Technical Context
The TLC251BCP uses Texas Instruments' silicon-gate LinCMOS™ process to achieve stable input offset voltage without metal-gate CMOS drift, while retaining ultra-low input bias current (≤60 pA typ) and high input impedance. Its BIAS SELECT pin enables hardware-programmable ac performance: high-bias mode (1000 µA typ, 1.7 MHz GBW), medium-bias (150 µA typ, 525 kHz GBW), or low-bias (10 µA typ, 65 kHz GBW).
It supports true single-supply operation from 1.4 V to 16 V, with common-mode input range including the negative rail (VDD–/GND), output swing limited only by load and supply, and internal ESD protection exceeding 2000 V per MIL-STD-833C Method 3015.1. Offset nulling is implemented via external 25-kΩ potentiometer between OFFSET N1/N2 pins referenced to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.4 V to 16 V - enables direct use with single alkaline, lithium coin cell, or solar cell sources without regulation. |
| Input Offset Voltage (max) | 2 mV at 25°C - ensures ≤2 mV dc error in precision gain stages without trimming in most low-side current sensing applications. |
| Supply Current (high-bias) | 1000 µA typical at VDD = 5 V - balances speed and power for portable data loggers requiring >1 MHz bandwidth. |
| Slew Rate (high-bias) | 3.6 V/µs at VDD = 5 V - supports clean 100-kHz sine wave output into 10-kΩ//20-pF load without distortion. |
| Unity-Gain Bandwidth | 1.7 MHz (high-bias, VDD = 5 V) - sufficient for anti-aliasing filters and active RC stages up to ~100 kHz closed-loop. |
| Input Bias Current | 0.6 pA typical at 25°C - preserves signal integrity in pH probe interfaces and photodiode transimpedance amplifiers. |
| ESD Protection | >2000 V per MIL-STD-833C, Method 3015.1 - reduces field failure risk in handheld medical or industrial test equipment. |
Pinout & Package
Package: Plastic DIP (P), 8-pin, through-hole mounting. Body dimensions: 9.27 mm × 6.35 mm × 3.3 mm (JEDEC MS-001). RoHS compliant, lead finish: matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OFFSET N1) | Offset Null Input 1 | Connects to one end of 25-kΩ potentiometer; used with Pin 5 to trim input offset voltage to zero in high-bias mode. |
| 2 (IN–) | Inverting Input | Differential input node; common-mode range extends to VDD–/GND (0 V), enabling ground-referenced signal conditioning. |
| 3 (IN+) | Non-Inverting Input | Differential input node; identical common-mode range as IN–; supports rail-to-rail input operation. |
| 4 (VDD–/GND) | Negative Supply / Ground | Reference node for single-supply operation; tied to system ground; all voltages referenced to this pin. |
| 5 (BIAS SELECT) | Bias Mode Control | Logic-level input: grounded = high-bias (1000 µA), VDD/2 ≈ 5 V = medium-bias (150 µA), VDD = low-bias (10 µA). |
| 6 (VDD) | Positive Supply | Accepts 1.4–16 V; powers internal LinCMOS™ circuitry; no reverse polarity protection required. |
| 7 (OUT) | Amplifier Output | Class-AB source-follower pull-up + open-drain pull-down; VOH ≥3.2 V @ RL = 10 kΩ, VOL ≤50 mV @ IOL = 0. |
| 8 (OFFSET N2) | Offset Null Input 2 | Connects to other end of 25-kΩ potentiometer; wiper ties to Pin 4 (GND) to complete nulling network. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Bias Modes | Three discrete IDD settings (10/150/1000 µA) via single BIAS SELECT pin - enables firmware-controlled power scaling in microprocessor-driven systems. |
| Rail-to-Rail Input Common-Mode | Includes VDD–/GND (0 V) - eliminates level-shifting need for ground-referenced sensors like thermistors or strain gauges. |
| Ultra-Low Input Bias Current | ≤60 pA typical - prevents signal degradation in high-Z networks (e.g., >10 MΩ feedback resistors in precision integrators). |
| Single-Supply Operation | Functional from 1.4 V - supports direct interface with 1.5-V alkaline cells or energy-harvesting circuits without LDO overhead. |
| External Offset Nulling | Two dedicated pins (1 & 8) with 25-kΩ potentiometer - achieves full nulling of 2-mV max offset in high-bias mode for <0.1% gain error. |
Applications
| Portable Gas Sensor Interface | Low-Power Data Logger 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 programmable gain and low-noise signal conditioning before ADC sampling. Use Value: 10 µA low-bias mode extends battery life to >5 years; rail-to-rail input captures full sensor dynamic range without biasing resistors. |
Use Scenario: Signal conditioning for temperature/humidity sensors in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision buffer and offset-compensated amplifier driving SAR ADC inputs. Use Value: 2 mV max input offset ensures ≤0.1°C error in RTD measurements; BIAS SELECT enables sleep/wake performance scaling. |
| Medical Pulse Oximeter Analog Front-End | Solar-Powered IoT Node Sensor Hub |
|
Use Scenario: Amplifying weak photodiode signals in battery-operated wearable pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-input-bias amplifier in transimpedance configuration with synchronous demodulation. Use Value: 0.6 pA input bias minimizes dark-current-induced offset drift; 1.4-V minimum supply allows direct LiFePO₄ cell operation. |
Use Scenario: Signal conditioning for soil moisture and light sensors in off-grid agricultural IoT gateways. IC Role / Device Role / Timing Role: Programmable gain stage and reference buffer for multi-sensor analog multiplexing. Use Value: High-bias mode (1.7 MHz GBW) supports fast settling for 100-Hz sampling; ESD rating >2000 V protects against field handling damage. |
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 |
|---|---|---|---|
| TLC251ACD | 5 mV max input offset voltage (vs. 2 mV for TLC251BCP); otherwise identical pinout, bias modes, and specs. | Higher offset tolerance acceptable in non-precision applications like general-purpose signal buffering. | Select TLC251ACD when 5 mV offset meets system accuracy requirements and cost reduction is prioritized. |
| TLC251CD | 10 mV max input offset voltage; same SOIC-8 package but surface-mount - differs from TLC251BCP's through-hole P package. | Used where PCB space constraints favor SOIC and higher offset is permissible (e.g., audio preamps, comparator hysteresis). | Choose TLC251CD only if surface-mount assembly is mandatory and 10 mV offset is acceptable for the signal chain. |
Compared with TLC251ACD and TLC251CD, the TLC251BCP offers the lowest guaranteed input offset (2 mV), making it the preferred choice for precision analog front-ends where dc accuracy directly impacts measurement fidelity - especially in battery-powered instrumentation where trimming components add cost and board area.
Availability
TLC251BCP is available at Aetrix Electronics and suitable for portable medical devices, environmental data loggers, solar-powered IoT nodes, and handheld test equipment requiring stable component supply across extended product lifecycles.
Supply support for TLC251BCP 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 op-amp innovation and broad industrial qualification.
The TLC251 family was designed specifically for ultra-low-power, single-supply precision signal conditioning in battery-constrained and energy-harvesting systems - emphasizing programmability, rail-to-rail input, and robustness in unregulated environments.
FAQ
What is the maximum supply voltage for the TLC251BCP?
The absolute maximum supply voltage for the TLC251BCP is 18 V, but the recommended operating range is 1.4 V to 16 V. Operating above 16 V risks exceeding internal junction limits and may degrade long-term reliability, even if functional temporarily. Always observe derating curves in the datasheet for thermal management at elevated VDD.
How does the BIAS SELECT pin affect the TLC251BCP's performance?
The BIAS SELECT pin on the TLC251BCP selects one of three operating modes: grounding it enables high-bias mode (1000 µA, 1.7 MHz GBW), connecting it to VDD/2 enables medium-bias (150 µA, 525 kHz GBW), and tying it to VDD enables low-bias (10 µA, 65 kHz GBW). This allows real-time trade-offs between speed, noise, and power without changing external components.
Can the TLC251BCP operate from a single 1.5-V alkaline cell?
Yes, the TLC251BCP is fully specified down to 1.4 V and operates reliably from a fresh 1.5-V alkaline cell. At VDD = 1.4 V, it delivers 12 kHz unity-gain bandwidth (low-bias), 0.1 V/µs slew rate (high-bias), and maintains input offset voltage ≤3 mV across 0°C to 70°C - making it suitable for ultra-low-voltage energy harvesting and disposable medical devices.
What external components are required for input offset nulling on the TLC251BCP?
A single 25-kΩ potentiometer is required: its two ends connect to Pins 1 (OFFSET N1) and 8 (OFFSET N2), and its wiper connects to Pin 4 (VDD–/GND). This configuration allows full nulling of the 2 mV max input offset in high-bias mode. No additional resistors or capacitors are needed - the network is self-contained and compatible with all three bias modes.
Is the TLC251BCP pin-compatible with other variants in the TLC251 family?
Yes, all TLC251xCP variants (TLC251CP, TLC251ACP, TLC251BCP) share identical 8-pin DIP pinout, electrical architecture, and bias-select functionality. The only differences are input offset voltage grade (10 mV / 5 mV / 2 mV) and minor parametric shifts in noise and phase margin - allowing drop-in replacement where offset tolerance permits.
TLC251BCP 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:
- 390 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
TLC251BCP FAQ
1.How can I place an order for TLC251BCP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC251BCP 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 TLC251BCP reliable?
The price and inventory of TLC251BCP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC251BCP is usually 5 days.
3.What payment methods are accepted for TLC251BCP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC251BCP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC251BCP?
TLC251BCP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC251BCP 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 TLC251BCP?
For technical support, including TLC251BCP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC251BCP requirements.
6.How does Aetrix verify that TLC251BCP is sourced from the original manufacturer or authorized distributors?
All TLC251BCP 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 TLC251BCP meets industry standards.
7.What is the process for return or replacement of TLC251BCP?
All TLC251BCP units undergo pre-shipment inspection (PSI). If there is an issue with TLC251BCP, 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 TLC251BCP part is unused and in its original packaging.
Return procedure for TLC251BCP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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