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Texas Instruments OPA2251PA
- Part No.:
- OPA2251PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA2251PA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
OPA2251PA from Texas Instruments is a dual-channel, micro-power operational amplifier optimized for ±15V supply operation, delivering 25μA quiescent current per amplifier, ±250μV max input offset voltage, rail-to-rail output swing within 50mV of rails, and 124dB common-mode rejection - used in portable medical instrumentation requiring precision, low power, and single- or dual-supply flexibility.
For engineers reviewing the OPA2251PA datasheet, OPA2251PA pinout, OPA2251PA application, or OPA2251PA equivalent, key selection considerations include its ±15V optimization (vs. 5V for OPAx241), dual-channel SOIC-8 or PDIP-8 packaging, trim-capable offset performance, and verified capacitive load drive up to 2700pF at ±15V/10× gain.
Technical Context
The OPA2251PA belongs to the OPAx251 family, laser-trimmed specifically at ±15V for minimal offset voltage (±50μV typ) and drift (±0.5μV/°C), while maintaining full functionality across 2.7V–36V single or ±1.35V–±18V dual supplies. Its input common-mode range extends 200mV below V–, enabling robust single-supply sensing.
It is unity-gain stable and supports large capacitive loads - stability analysis confirms safe operation with up to 2700pF at ±15V/10× gain, versus only ~200pF at 5V/unity gain. External offset trim pins (1 & 5) are provided only on single-channel variants (OPA251), not on OPA2251PA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 2.7V–36V; Dual: ±1.35V–±18V - enables direct integration into legacy ±15V systems and modern wide-range battery-powered designs. |
| Quiescent Current | ±27μA to ±38μA per amplifier - ensures multi-year battery life in portable instruments without sacrificing dc precision. |
| Input Offset Voltage | ±50μV (typ), ±250μV (max) at ±15V - eliminates need for user trimming in most high-accuracy sensor front-ends. |
| CMRR | 124dB (min) - rejects noise from shared power rails in multi-channel medical signal conditioning. |
| Output Swing | Within 50mV of rails (AOL > 100dB) - maximizes dynamic range in low-voltage data acquisition stages. |
| Gain-Bandwidth | 30kHz - sufficient for dc-coupled biopotential amplification (ECG, EEG) and slow-sensing applications. |
| Input Bias Current | –4nA to –20nA - compatible with high-impedance pH electrodes and piezoelectric sensors. |
Pinout & Package
OPA2251PA is available in 8-pin PDIP (P) and SOIC (D) packages. Both share identical pinout and thermal characteristics (RθJA = 100°C/W for PDIP, 150°C/W for SOIC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | Accepts high-impedance sensor signals; common-mode range extends to V– – 0.2V. |
| –IN A (Pin 2) | Inverting input, Channel A | Configures standard op-amp topologies (inverting amp, transimpedance, difference amp). |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail capable; drives 10kΩ loads with <100mV headroom at AOL > 100dB. |
| V– (Pin 4) | Negative power supply | Reference for both inputs and output; supports true dual-supply or single-supply negative biasing. |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent second channel for dual-path signal processing (e.g., reference + signal channels). |
| –IN B (Pin 6) | Inverting input, Channel B | Enables matched dual-channel configurations without crosstalk (channel separation 0.3μV/V). |
| OUT B (Pin 7) | Output, Channel B | Simultaneous dual-output capability avoids interleaving delays in synchronized measurements. |
| V+ (Pin 8) | Positive power supply | Supports up to 36V single supply or ±18V dual supply; bypassing with 0.01μF ceramic required. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset at ±15V | Ensures ±50μV typical offset under actual operating conditions - no recalibration needed when deployed in ±15V industrial or test equipment. |
| Rail-to-rail output | Delivers full 30Vpp swing on ±15V supplies - preserves signal fidelity in analog front-ends where headroom is constrained. |
| Unity-gain stable | Operates reliably in buffer, follower, and gain-of-one configurations without external compensation - reduces BOM count and layout complexity. |
| Wide temperature range | Specified from –40°C to +85°C, functional from –55°C to +125°C - suitable for automotive cabin modules and industrial field instruments. |
| High open-loop gain | 128dB minimum - maintains accuracy in precision gain stages (e.g., 100× amplification with <0.01% gain error). |
Applications
| Portable ECG Monitors | Battery-Powered Gas Sensors |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from dry electrodes in handheld ECG devices. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end stage, with one channel for signal and one for reference rejection. Use Value: 124dB CMRR suppresses 50/60Hz mains interference; 25μA IQ extends AA-battery life beyond 18 months. |
Use Scenario: Conditioning output from electrochemical gas sensors with sub-nA output currents and mV-level sensitivity. IC Role / Device Role / Timing Role: Transimpedance amplifier and level-shifting buffer for analog sensor interface. Use Value: –20nA max input bias current prevents sensor polarization; rail-to-rail output drives ADCs directly without level-shifting circuitry. |
| Low-Power Data Loggers | Industrial Process Controllers |
Use Scenario: Signal conditioning for thermistor, RTD, and strain gauge measurements in solar-powered remote telemetry units. IC Role / Device Role / Timing Role: Precision gain stage and anti-aliasing filter driver in multi-sensor acquisition subsystems. Use Value: ±250μV max offset enables <0.1°C temperature resolution; 30kHz GBW supports oversampling at 1ksps. |
Use Scenario: Isolated analog I/O conditioning in PLC modules operating from ±15V backplane supplies. IC Role / Device Role / Timing Role: Input buffer and output driver for 4–20mA loop interfaces and analog setpoint circuits. Use Value: ±18V absolute max supply rating ensures robustness against transient overvoltage; 100kΩ min input impedance avoids loading sensor bridges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, micropower operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333PA | Chopper-stabilized (0.02μV/°C drift), 17μA IQ, 350kHz GBW - higher speed and lower drift, but 1.8V–5.5V supply only. | Best for ultra-low-drift, battery-powered IoT nodes with 3.3V rails - not suitable for ±15V or >5.5V systems. | Select OPA2333PA only if supply is ≤5.5V and drift <0.1μV/°C is mandatory; otherwise OPA2251PA provides broader voltage support and proven ±15V precision. |
| LM2904BDR | 240μA IQ, ±13V max supply, ±3mV offset - higher power, wider offset, but AEC-Q100 qualified and cost-optimized. | Preferred for automotive body electronics where qualification and cost outweigh micropower needs. | Choose LM2904BDR for cost-sensitive, non-battery applications with <±13V supplies; OPA2251PA remains superior for precision, low-power industrial or medical use. |
Compared with OPA2333PA and LM2904BDR, the OPA2251PA uniquely balances ±15V operation, micropower consumption, and sub-250μV offset - making it the only option among the three qualified for high-accuracy, wide-supply, battery-constrained instrumentation.
Availability
OPA2251PA is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered gas sensors, low-power data loggers, and industrial process controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA2251PA 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 signal chain innovation.
The OPAx251 series was designed for high-accuracy, low-power analog signal conditioning in portable and industrial instrumentation - emphasizing ±15V optimization, rail-to-rail output, and laser-trimmed dc performance.
FAQ
What supply voltages does the OPA2251PA support?
The OPA2251PA operates from single supplies of 2.7V to 36V or dual supplies of ±1.35V to ±18V. It is laser-trimmed for optimal performance at ±15V, where it achieves ±50μV typical input offset voltage and ±0.5μV/°C drift. Performance remains functional across the full range, though offset and drift degrade slightly outside ±15V - confirmed in Section 5.7 of the SBOS075A datasheet.
Does the OPA2251PA have offset voltage trim pins?
No, the OPA2251PA does not include offset voltage trim pins. Trim capability is provided only on the single-channel variants OPA251 and OPA241 (pins 1 and 5). The dual-channel OPA2251PA and OPA2241 omit trim terminals to maintain compact 8-pin SOIC/PDIP packaging - consistent with Table 4-2 and Section 6.1.2 of the official datasheet.
What is the maximum capacitive load the OPA2251PA can drive stably?
At ±15V supply and G = 10, the OPA2251PA drives up to 2700pF stably. At 5V/unity gain, stable drive is limited to ~200pF. Figure 6-3 in the SBOS075A datasheet documents this dependency. For marginal cases, adding a 5kΩ series resistor inside the feedback loop (Figure 6-4) improves stability with >1000pF loads while preserving DC accuracy.
Is the OPA2251PA unity-gain stable?
Yes, the OPA2251PA is unity-gain stable per Section 6.1.1 and Figure 6-2–6-3 of the SBOS075A datasheet. It requires no external compensation in voltage-follower, inverting, or non-inverting configurations at gains ≥1. This simplifies design in sensor buffering and active filtering applications where phase margin is critical.
What package options are available for the OPA2251PA?
The OPA2251PA is offered in 8-pin PDIP (P) packaging, marked "OPA2251PA" and RoHS-compliant with NiPdAu lead finish. The SOIC-8 variant is designated OPA2251UA. Both share identical electrical specifications and pinout per Table 4-2 and the PACKAGE OPTION ADDENDUM in the SBOS075A datasheet.
OPA2251PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.01V/µs
- Gain Bandwidth Product:
- 35 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 27µA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA2251PA FAQ
1.How can I place an order for OPA2251PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2251PA 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 OPA2251PA reliable?
The price and inventory of OPA2251PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2251PA is usually 5 days.
3.What payment methods are accepted for OPA2251PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2251PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2251PA?
OPA2251PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2251PA 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 OPA2251PA?
For technical support, including OPA2251PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2251PA requirements.
6.How does Aetrix verify that OPA2251PA is sourced from the original manufacturer or authorized distributors?
All OPA2251PA 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 OPA2251PA meets industry standards.
7.What is the process for return or replacement of OPA2251PA?
All OPA2251PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2251PA, 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 OPA2251PA part is unused and in its original packaging.
Return procedure for OPA2251PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2251PA Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
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