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Texas Instruments OPA4251UA
- Part No.:
- OPA4251UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4251UA.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:451
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Product details
Overview
OPA4251UA from Texas Instruments is a quad-channel, micro-power operational amplifier optimized for ±15V dual-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 instruments and battery-powered test equipment.
For engineers reviewing the OPA4251UA datasheet, OPA4251UA pinout, OPA4251UA application, or OPA4251UA equivalent, key selection criteria include low-power precision amplification under ±15V supply, quad-channel integration in SOIC-14, rail-to-rail output capability, and offset voltage stability across –40°C to +85°C industrial temperature range.
Technical Context
The OPA4251UA belongs to the OPAx251 family, laser-trimmed at ±15V for minimal offset voltage (±50μV typ) and drift (±0.5μV/°C), with unity-gain stability and capacitive load drive up to 2700pF at ±15V. Its input common-mode range extends 200mV below V–, enabling robust single-supply use down to 2.7V.
It features high open-loop gain (128dB), 30kHz gain-bandwidth product, and 0.01V/μs slew rate - optimized for precision DC-coupled signal conditioning where power efficiency and accuracy coexist, not for high-speed AC applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | ±27 μA per amplifier - enables multi-channel sensing in battery-operated systems with >10-year shelf life. |
| Input Offset Voltage | ±50 μV (typ), ±250 μV (max) at ±15V - eliminates need for external trimming in most precision sensor front-ends. |
| CMRR | 124 dB - rejects noise from shared power rails in multi-amplifier PCB layouts. |
| Rail-to-Rail Output | Swings within 50 mV of supply rails - maximizes dynamic range in 3.3V or 5V single-supply data acquisition. |
| Supply Range | ±1.35V to ±18V (dual); 2.7V to 36V (single) - supports legacy ±15V lab gear and modern low-voltage IoT nodes. |
| Gain-Bandwidth | 30 kHz - sufficient for DC–10kHz sensor signal conditioning (e.g., strain gauges, thermocouples). |
| Operating Temp | –40°C to +85°C (fully specified); –55°C to +125°C (functional) - suitable for industrial control cabinets and automotive under-hood modules. |
Pinout & Package
OPA4251UA is housed in a 14-pin SOIC (D package), 8.65 mm × 3.91 mm body, 1.27 mm pitch, with exposed pad not present. Pin 1 is channel A noninverting input; pins 11 and 4 are V– and V+ power terminals respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance node (1 GΩ || 4 pF) for precision voltage sensing without loading source. |
| –IN A (Pin 2) | Inverting input, Channel A | Accepts feedback network for configurable gain; differential input voltage limited to ±0.5V. |
| OUT A (Pin 1) | Output, Channel A | Capable of sourcing 4 mA / sinking 24 mA; drives 10 kΩ loads while maintaining 100 dB open-loop gain. |
| V+ (Pin 4) | Positive supply | Highest potential rail; must be bypassed with 0.01 μF ceramic capacitor near pin for stability. |
| V– (Pin 11) | Negative supply | Lowest potential rail; input common-mode extends 200 mV below this pin - critical for single-supply biasing. |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent high-Z input identical to +IN A; no crosstalk beyond 0.3 μV/V channel separation. |
| –IN B (Pin 6) | Inverting input, Channel B | Isolated from Channel A inputs; supports independent feedback paths per channel. |
| OUT B (Pin 7) | Output, Channel B | Electrically isolated output; short-circuit protected with thermal foldback. |
| +IN C (Pin 10) | Noninverting input, Channel C | Third independent input stage; matches performance specs of Channels A/B. |
| –IN C (Pin 9) | Inverting input, Channel C | Supports dedicated gain-setting resistors; no internal connection to other channels. |
| OUT C (Pin 8) | Output, Channel C | Delivers same rail-to-rail swing and load drive as OUT A/B. |
| +IN D (Pin 12) | Noninverting input, Channel D | Fourth matched input; enables 4-channel simultaneous sampling in compact layout. |
| –IN D (Pin 13) | Inverting input, Channel D | Independent feedback node; allows four separate op-amp configurations on one IC. |
| OUT D (Pin 14) | Output, Channel D | Full-output swing capability; shares V+ and V– rails with other channels. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset at ±15V | ±50 μV typical offset ensures <1 LSB error in 16-bit ADC front-ends powered from ±15V supplies. |
| Rail-to-rail output swing | 50 mV from rails at 100 dB AOL enables full-scale utilization of 3.3V ADC references without level-shifting. |
| Unity-gain stable | No external compensation required - simplifies design of buffer, follower, and active filter circuits. |
| High CMRR (124 dB) | Rejects 99.999% of common-mode noise on shared sensor excitation lines in industrial transmitters. |
| Quad-channel SOIC-14 | Reduces board area by 75% vs four discrete SOIC-8 op-amps; lowers interconnect parasitics and routing complexity. |
Applications
| Portable ECG Monitor | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Amplifying low-amplitude (0.5–5 mV), low-frequency (0.05–150 Hz) biopotential signals from dry electrodes in handheld ECG units. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front-end: two channels for differential lead I acquisition, one for lead II, one for right-leg drive reference. Use Value: 25 μA per amplifier extends AA battery life to >2 years; rail-to-rail output interfaces directly to 12-bit SAR ADC with 3.3V reference. |
Use Scenario: Conditioning analog outputs from multiple sensors (temperature, humidity, pressure) in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Four independent precision buffers driving multiplexed ADC inputs; each channel conditioned for its sensor's output impedance and range. Use Value: Single SOIC-14 replaces four discrete op-amps, reducing PCB area by 40% and eliminating inter-channel layout mismatches. |
| Industrial Thermocouple Transmitter | Low-Power Oscilloscope Front-End |
|
Use Scenario: Cold-junction compensation and linearization of K-type thermocouple outputs in DIN-rail mounted field transmitters. IC Role / Device Role / Timing Role: Precision voltage follower (Channel A) for thermocouple input, difference amplifier (Channels B/C) for RTD reference, buffer (Channel D) for 4–20 mA loop driver interface. Use Value: ±250 μV max offset contributes <0.1°C error over –40°C to +85°C ambient - meets Class 1 thermocouple accuracy standards. |
Use Scenario: DC-coupled vertical amplification stage in handheld digital oscilloscopes requiring sub-mV sensitivity and wide dynamic range. IC Role / Device Role / Timing Role: Quad-channel programmable gain amplifier: two channels for differential probe inputs, two for calibration and offset nulling circuitry. Use Value: 124 dB CMRR suppresses ground-loop noise from switching power supplies; 30 kHz GBW supports accurate display of 10 kHz sine waves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4241UA | Optimized for 5V single supply; higher offset drift (±0.6 μV/°C) and lower CMRR (106 dB) at ±15V. | Better suited for 3.3V/5V battery-powered devices than ±15V lab equipment. | Select OPA4241UA when operating primarily at ≤5V and cost-sensitive; OPA4251UA preferred for ±15V legacy systems. |
| TLV2474IDR | Higher quiescent current (600 μA), lower GBW (2.8 MHz), but rail-to-rail I/O and wider temp range (–40°C to +125°C). | Targeted at higher-speed, higher-power applications like motor control feedback, not ultra-low-power precision sensing. | Choose TLV2474IDR only if speed >100 kHz is required and power budget allows 24× higher IQ than OPA4251UA. |
Compared with OPA4241UA and TLV2474IDR, the OPA4251UA uniquely balances ±15V-optimized precision, 25μA ultra-low power, and quad-channel integration - making it the only choice for extending battery life in ±15V-powered portable test gear without sacrificing DC accuracy.
Availability
OPA4251UA is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, industrial thermocouple transmitters, and handheld oscilloscope front-ends requiring stable component supply across extended production lifecycles.
Supply support for OPA4251UA 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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.
The OPAx251 series was developed specifically for high-precision, low-power signal conditioning in ±15V-powered portable instrumentation - emphasizing offset stability, rail-to-rail output, and quad-channel density in SOIC packaging.
FAQ
What is the maximum capacitive load the OPA4251UA can drive stably at ±15V?
The OPA4251UA can drive up to 2700 pF capacitively in unity-gain configuration at ±15V supply with gain ≥10. At G = 1 and ±15V, stability is maintained up to ~200 pF without external compensation. For larger loads, adding a 5 kΩ series resistor in the feedback path (as shown in TI's Figure 6-4) extends stable operation beyond 1000 pF while preserving DC accuracy - a technique validated in the OPA4251UA datasheet Section 6.1.3.
Does the OPA4251UA have offset trim pins?
No, the OPA4251UA does not include offset trim pins. Trim capability is provided only on the single-channel variants (OPA251 and OPA241), which feature TRIM pins 1 and 5. The quad-channel OPA4251UA relies on factory laser trimming at ±15V to achieve ±50 μV typical and ±250 μV maximum input offset voltage - eliminating the need for user adjustment in most precision applications.
Can the OPA4251UA operate from a single 3.3V supply?
Yes, the OPA4251UA supports single-supply operation from 2.7V to 36V, including 3.3V. Its input common-mode range extends 200 mV below V– (i.e., down to 0.1V at 3.3V), and output swings within 50 mV of both rails. However, offset voltage and drift are optimized for ±15V; at 3.3V, max VOS increases to ±400 μV and dVOS/dT rises to ±0.6 μV/°C - still suitable for many low-voltage precision tasks.
What is the thermal resistance (RθJA) of the OPA4251UA in SOIC-14 package?
The OPA4251UA in SOIC-14 (D package) has a junction-to-ambient thermal resistance (RθJA) of 100°C/W, as specified in Section 5.5 of the datasheet. This value assumes standard JEDEC 2-layer board conditions. For high-reliability designs, derating guidelines recommend limiting power dissipation to maintain junction temperature below 125°C - especially critical in sealed enclosures or high-ambient environments.
How does the OPA4251UA compare to the OPA4277UA in precision applications?
The OPA4251UA and OPA4277UA serve different precision tiers: OPA4251UA offers micro-power (25 μA) and ±250 μV max offset at ±15V, while OPA4277UA delivers ultra-low offset (±10 μV) and drift (±0.1 μV/°C) but consumes 4 mA per amplifier. OPA4251UA is selected when battery life or thermal constraints dominate; OPA4277UA when nanovolt-level DC accuracy is mandatory - such as in calibration standards or metrology-grade equipment.
OPA4251UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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:
- -
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4251UA FAQ
1.How can I place an order for OPA4251UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4251UA 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 OPA4251UA reliable?
The price and inventory of OPA4251UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4251UA is usually 5 days.
3.What payment methods are accepted for OPA4251UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4251UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4251UA?
OPA4251UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4251UA 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 OPA4251UA?
For technical support, including OPA4251UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4251UA requirements.
6.How does Aetrix verify that OPA4251UA is sourced from the original manufacturer or authorized distributors?
All OPA4251UA 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 OPA4251UA meets industry standards.
7.What is the process for return or replacement of OPA4251UA?
All OPA4251UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4251UA, 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 OPA4251UA part is unused and in its original packaging.
Return procedure for OPA4251UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4251UA Tags
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LM358DR
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