My Inquiry
My Account
Texas Instruments OPA2251UA/2K5
- Part No.:
- OPA2251UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2251UA/2K5.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,951
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA2251UA/2K5 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 instruments and battery-powered test equipment.
For engineers reviewing the OPA2251UA/2K5 datasheet, OPA2251UA/2K5 pinout, OPA2251UA/2K5 application, or OPA2251UA/2K5 equivalent, key selection criteria include low-power precision amplification under ±15V bias, dual-channel integration in SOIC-8, temperature-stable offset performance across −40°C to +85°C, and compatibility with capacitive loads up to 2700pF at ±15V/10× gain.
Technical Context
The OPA2251UA/2K5 belongs to the OPAx251 family, laser-trimmed specifically for ±15V operation, with guaranteed offset voltage ≤±250μV at TA = −40°C to +85°C and drift ≤±0.5μV/°C. Its input common-mode range extends 200mV below V−, supporting single-supply configurations down to 2.7V while maintaining rail-to-rail output swing.
It is unity-gain stable and drives large capacitive loads - up to ~2700pF at ±15V with G = 10 - due to internal compensation optimized for high-voltage, low-quiescent-current operation. The device features external offset trim pins (1 and 5) only on single-channel variants; the dual-channel OPA2251UA/2K5 omits trim capability per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 2.7V–36V; Dual: ±1.35V–±18V - supports wide-input industrial and portable systems without level-shifting. |
| Quiescent Current | ±27μA to ±38μA per amplifier at ±15V - enables multi-year battery life in always-on sensing nodes. |
| Input Offset Voltage | ±50μV typ / ±250μV max at ±15V - eliminates need for manual nulling in precision DC-coupled signal chains. |
| CMRR | 100–124dB over −40°C to +85°C - rejects noise from shared power rails in mixed-signal PCBs. |
| Open-Loop Gain | 100–128dB at ±15V - ensures <0.01% gain error in closed-loop configurations with gains ≤100. |
| Gain-Bandwidth | 30kHz - suitable for low-frequency sensor conditioning (e.g., thermocouple, strain gauge) with minimal phase lag. |
| Output Swing | Within 50mV of rails at AOL >100dB - maximizes dynamic range in 12-bit+ ADC front-ends. |
Pinout & Package
OPA2251UA/2K5 is housed in an 8-pin SOIC (D package), surface-mount, RoHS-compliant package with standard JEDEC MS-012AC footprint and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A | Noninverting input, Channel A | High-impedance node (1GΩ || 4pF) accepting DC-coupled sensor signals up to V− −0.2V. |
| −IN A | Inverting input, Channel A | Accepts feedback network or reference voltage; matched to +IN A for CMRR optimization. |
| OUT A | Amplified output, Channel A | Rail-to-rail capable; drives 10kΩ load with <100mV headroom at AOL >100dB. |
| V− | Negative power supply | Reference for both inputs and output; common return for dual-supply operation or ground in single-supply mode. |
| +IN B | Noninverting input, Channel B | Independent high-Z input identical to +IN A; enables dual-sensor or differential pair processing. |
| −IN B | Inverting input, Channel B | Matched complementary input for Channel B; supports independent gain configuration per channel. |
| OUT B | Amplified output, Channel B | Fully isolated output stage; no crosstalk (<0.3μV/V) between channels at 1kHz. |
| V+ | Positive power supply | Highest potential rail; supplies both amplifiers; bypass with 0.01μF ceramic capacitor per datasheet recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Micro-power operation | 27–38μA per amplifier at ±15V enables multi-channel analog front-ends in energy-constrained devices. |
| Rail-to-rail output | Swings within 50mV of V+ and V− at full open-loop gain - preserves signal fidelity in low-voltage ADC interfaces. |
| High CMRR (124dB) | Maintains accuracy in noisy environments (e.g., motor-driven medical pumps) where supply ripple couples into inputs. |
| Unity-gain stability | Operates reliably with no external compensation in buffer, follower, or gain=1 configurations. |
| Wide temperature range | Specified from −40°C to +85°C - qualified for industrial and portable medical equipment deployment. |
Applications
| Portable ECG Monitor | Battery-Powered Data Logger |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals (0.5–5mV) from dry electrodes with minimal power draw. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end (Channel A for lead I, Channel B for lead II), providing DC-coupled gain and baseline stabilization. Use Value: 25μA per amplifier extends AA-cell lifetime beyond 3 years in sleep-mode logging; ±250μV offset avoids baseline drift-induced false arrhythmia detection. |
Use Scenario: Conditioning thermistor and RTD outputs in field-deployed environmental sensors powered by Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Dual-channel precision voltage follower and buffer, isolating sensor bridges from multiplexer and ADC input capacitance. Use Value: Rail-to-rail output ensures full utilization of 16-bit SAR ADC input range; 124dB CMRR rejects common-mode noise from solar-charged power rails. |
| Handheld Multimeter Input Stage | Low-Power Industrial Transmitter |
Use Scenario: Scaling and buffering high-impedance voltage inputs (up to 1000V via divider) while maintaining 4½-digit resolution. IC Role / Device Role / Timing Role: Dual op-amp configured as precision attenuator (Channel A) and reference buffer (Channel B) for auto-ranging circuitry. Use Value: 30kHz GBW supports fast settling (<100μs) during range switching; ±250μV offset contributes <0.005% error in 10V full-scale measurement. |
Use Scenario: Converting 4–20mA loop current to isolated voltage output in explosion-proof process transmitters. IC Role / Device Role / Timing Role: Dual-channel current-to-voltage converter and output driver, operating from 24V loop supply with internal LDO-derived ±15V rails. Use Value: 2.7V–36V supply range allows direct use of unregulated loop voltage; low IQ minimizes self-heating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, low-power precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02μV/°C drift vs OPA2251UA/2K5's ±0.5μV/°C; higher IQ (17μA vs 27μA typ at ±15V). | Better long-term DC stability in temperature-varying environments; less suitable for ultra-low-IQ designs requiring <30μA. | Select OPA2333AIDR when offset drift dominates error budget; retain OPA2251UA/2K5 for cost-sensitive, moderate-drift applications with strict IQ limits. |
| LMV358IDR | Higher IQ (150μA); lower CMRR (70dB); rail-to-rail input/output; not specified for ±15V operation (max VS = 5.5V). | Only viable in 3.3V/5V single-supply systems; unsuitable for ±15V industrial signal conditioning or high-CMRR requirements. | Use LMV358IDR only in low-voltage consumer-grade designs; OPA2251UA/2K5 remains mandatory for ±15V, low-drift, high-rejection applications. |
Compared with OPA2333AIDR and LMV358IDR, the OPA2251UA/2K5 uniquely balances ±15V operation, sub-30μA quiescent current, and 124dB CMRR - making it irreplaceable in dual-supply portable test gear and medical devices where power, precision, and supply flexibility intersect.
Availability
OPA2251UA/2K5 is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, handheld multimeters, and low-power industrial transmitters requiring stable component supply across extended production lifecycles.
Supply support for OPA2251UA/2K5 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 signal-chain solutions.
The OPA2251UA/2K5 belongs to TI's OPAx251 series - designed explicitly for high-voltage, micro-power precision amplification in portable and battery-operated instrumentation where ±15V operation, low offset, and rail-to-rail output are critical.
FAQ
What supply voltages does the OPA2251UA/2K5 support?
The OPA2251UA/2K5 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, with guaranteed specifications including ±250μV max offset voltage and 124dB CMRR across −40°C to +85°C under those conditions. Performance remains functional across the full range, though offset and drift values degrade slightly outside ±15V.
Does the OPA2251UA/2K5 have offset voltage trim pins?
No, the OPA2251UA/2K5 does not include offset voltage trim pins. Trim capability is provided only on the single-channel variants OPA251 and OPA241 (pins 1 and 5). As a dual-channel SOIC-8 device, the OPA2251UA/2K5 relies entirely on factory laser trimming for its ±250μV max input offset voltage specification and offers no user-accessible adjustment.
Can the OPA2251UA/2K5 drive capacitive loads, and how much?
Yes, the OPA2251UA/2K5 is unity-gain stable and can drive substantial capacitive loads: up to ~2700pF at ±15V with gain = 10, or ~200pF in unity-gain configuration at ±15V. For unstable conditions, a small series resistor (e.g., 5kΩ) in the feedback path improves stability with large loads while preserving DC accuracy - a technique validated in TI's SBOS075A datasheet Figure 6-4.
What is the operating temperature range for the OPA2251UA/2K5?
The OPA2251UA/2K5 is fully specified from −40°C to +85°C for all key parameters including input offset voltage, CMRR, and open-loop gain. It can operate continuously from −55°C to +125°C, though certain parameters like offset drift and quiescent current are not production-tested beyond the −40°C to +85°C range.
Is the OPA2251UA/2K5 RoHS compliant and what package does it use?
Yes, the OPA2251UA/2K5 is RoHS compliant and packaged in an 8-pin SOIC (D package) with NIPDAU lead finish. It uses the standard JEDEC MS-012AC outline, 1.27mm pitch, and is supplied on tape-and-reel (2K5 = 2500 units per reel), meeting IPC/JEDEC J-STD-020 moisture sensitivity level requirements for surface-mount assembly.
OPA2251UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2251UA/2K5 FAQ
1.How can I place an order for OPA2251UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2251UA/2K5 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 OPA2251UA/2K5 reliable?
The price and inventory of OPA2251UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2251UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2251UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2251UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2251UA/2K5?
OPA2251UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2251UA/2K5 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 OPA2251UA/2K5?
For technical support, including OPA2251UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2251UA/2K5 requirements.
6.How does Aetrix verify that OPA2251UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2251UA/2K5 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 OPA2251UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2251UA/2K5?
All OPA2251UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2251UA/2K5, 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 OPA2251UA/2K5 part is unused and in its original packaging.
Return procedure for OPA2251UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2251UA/2K5 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
