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Analog Devices Inc./Maxim Integrated MAX4251ESA-G126
- Part No.:
- MAX4251ESA-G126
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4251ESA-G126.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,744
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Product details
Overview
MAX4251ESA-G126 from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier optimized for low-noise (7.9nV/√Hz), low-distortion (0.0002% THD) signal conditioning in battery-powered systems. It operates from 2.4V to 5.5V single supply, draws 400µA quiescent current per amplifier, and features shutdown mode reducing current to 0.5µA - ideal for portable instrumentation and ADC buffer applications.
For engineers reviewing the MAX4251ESA-G126 datasheet, MAX4251ESA-G126 pinout, MAX4251ESA-G126 application, or MAX4251ESA-G126 equivalent, key selection criteria include its 3MHz gain-bandwidth product, unity-gain stability, ±1pA input bias current, rail-to-rail output swing within 8mV of rails (10kΩ load), and guaranteed operation over –40°C to +85°C.
Technical Context
The MAX4251ESA-G126 belongs to the MAX4249–MAX4257 family of single-supply op amps with true rail-to-rail output stages and ground-sensing inputs (input common-mode range includes VSS). It is unity-gain stable with a 3MHz gain-bandwidth product and delivers 116dB large-signal voltage gain while maintaining low distortion across frequencies up to 20kHz.
Its internal compensation ensures stability at AV = 1V/V, and it supports capacitive-load driving up to 400pF without oscillation. The device includes a dedicated SHDN pin that places the output in high-impedance state and reduces supply current to 0.5µA - critical for power-gated sensor front-ends and portable medical devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - enables stable unity-gain buffering of signals up to ~300kHz with <0.1dB gain error. |
| Input Voltage-Noise Density | 7.9nV/√Hz at 30kHz - preserves SNR in precision analog front-ends for 16-bit ADCs. |
| Total Harmonic Distortion + Noise | 0.0002% THD+N at 1kHz - meets audio-grade and medical instrumentation linearity requirements. |
| Quiescent Supply Current | 400µA per amplifier - allows continuous operation in multi-day battery-powered sensors. |
| Output Voltage Swing | Within 8mV of rails (VDD/VSS) with 10kΩ load - maximizes dynamic range in 3.3V or lower supply systems. |
| Input Bias Current | ±1pA typical - minimizes voltage error when interfacing with high-impedance sources like piezoelectric transducers. |
| Input Common-Mode Range | Includes ground (VSS) to VDD – 1.1V - enables direct sensing of 0V-referenced signals without level-shifting. |
Pinout & Package
MAX4251ESA-G126 is housed in an 8-pin SO (Small Outline) package with exposed pad, compatible with standard SOIC-8 PCB footprints and reflow assembly. Pin 1 is marked with a dot or notch orientation indicator.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail capable, drives 1kΩ loads while maintaining DC accuracy. |
| 2 | IN− | Inverting input - high-impedance node; requires matched trace routing to minimize offset drift. |
| 3 | IN+ | Noninverting input - accepts signals down to VSS; no phase reversal on overdrive. |
| 4 | VSS | Negative supply - connect directly to system ground for single-supply operation. |
| 5 | SHDN | Shutdown control - logic-low disables amplifier and forces output into high-Z state. |
| 6 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed adjacent to pin for noise immunity. |
| 7 | N.C. | No connection - not internally bonded; leave unconnected on PCB. |
| 8 | N.C. | No connection - not internally bonded; leave unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal headroom in 2.4V–5.5V systems - eliminates need for dual supplies in portable designs. |
| Low-power shutdown mode | Reduces IQ to 0.5µA and places output in high-impedance state - enables dynamic power gating in duty-cycled sensor nodes. |
| Unity-gain stability | Guaranteed stable at AV = 1V/V without external compensation - simplifies design of precision buffers and active filters. |
| 400pF capacitive-load drive | Maintains stability driving long traces, cables, or ADC input capacitance without isolation resistor - reduces BOM count. |
| Ground-sensing input | Input common-mode range includes VSS - enables direct interface with 0V-referenced transducers and bridge sensors. |
Applications
| Portable Medical Sensors | High-Resolution ADC Buffers |
|---|---|
Use Scenario: Signal conditioning for ECG/EEG front-ends powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-noise, low-distortion buffer amplifying µV-level biopotential signals before digitization. Use Value: 7.9nV/√Hz input noise and 0.0002% THD preserve diagnostic fidelity; 400µA IQ extends battery life beyond 7 days. | Use Scenario: Driving the analog input of 16-bit SAR ADCs (e.g., MAX195) in data acquisition modules. IC Role / Device Role / Timing Role: Unity-gain buffer isolating ADC input from source impedance and minimizing settling error. Use Value: Rail-to-rail output swing ensures full utilization of ADC reference range; 3MHz GBW supports ≤300kHz effective sampling bandwidth. |
| Digital Strain Gauge Interfaces | Battery-Powered Instrumentation |
Use Scenario: Amplifying mV-level Wheatstone bridge outputs in handheld torque or pressure meters. IC Role / Device Role / Timing Role: Precision noninverting amplifier with programmable gain, referenced to system ground. Use Value: ±1pA input bias current prevents offset errors from high-impedance bridge arms; input CM range including ground avoids level-shift circuitry. | Use Scenario: General-purpose analog signal conditioning in field-deployable test equipment with limited power budget. IC Role / Device Role / Timing Role: Configurable gain stage and active filter element in multi-channel analog signal chains. Use Value: Shutdown mode enables firmware-controlled power cycling; SO-8 package supports automated optical inspection and rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4251EUA+ | Same electrical specs, but in 8-pin µMAX (3mm × 3mm) package - smaller footprint, no exposed pad. | Preferred for space-constrained PCBs where thermal dissipation is less critical than area. | Select MAX4251EUA+ when board real estate is premium and SO-8 reflow profile compatibility is not required. |
| OPA333AIDBVR | Zero-drift architecture (0.02µV/°C VOS drift), 35µA IQ, 350kHz GBW - lower power but significantly lower bandwidth and noise (17nV/√Hz). | Suitable for ultra-low-offset DC-coupled applications (e.g., precision weigh scales), not for AC-coupled low-distortion paths. | Choose OPA333AIDBVR only when microvolt-level offset stability dominates over bandwidth and THD performance. |
Compared with MAX4251EUA+, MAX4251ESA-G126 offers superior thermal performance via SO-8 exposed pad and standard reflow compatibility; compared with OPA333AIDBVR, it delivers 8.6× higher GBW and 2.1× lower input voltage noise - making it the preferred choice for wideband, low-distortion signal chains.
Availability
MAX4251ESA-G126 is available at Aetrix Electronics and suitable for portable medical sensors, high-resolution ADC buffers, digital strain gauge interfaces, and battery-powered instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MAX4251ESA-G126 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX4249–MAX4257 product line delivers rail-to-rail, low-noise, low-distortion op amps optimized for battery-powered instrumentation and high-fidelity signal conditioning - balancing performance, power, and ease of use.
FAQ
What is the operating temperature range for MAX4251ESA-G126?
The MAX4251ESA-G126 is specified for operation from –40°C to +85°C. This industrial temperature range ensures reliable performance in portable medical devices, handheld test equipment, and environmental monitoring systems deployed in uncontrolled ambient conditions. All electrical parameters in the MAX4251ESA-G126 datasheet are guaranteed across this full range.
Does MAX4251ESA-G126 require external compensation for unity-gain operation?
No, MAX4251ESA-G126 does not require external compensation for unity-gain operation. It is internally compensated and unity-gain stable, with a guaranteed phase margin of 74° and gain margin of 10dB at AV = 1V/V. This eliminates the need for external capacitors or resistors in basic buffer configurations, simplifying layout and reducing component count.
What is the maximum capacitive load MAX4251ESA-G126 can drive without oscillation?
MAX4251ESA-G126 can drive capacitive loads up to 400pF while maintaining stability and avoiding sustained oscillations. This capability supports direct connection to ADC input capacitance, long PCB traces, or coaxial cables without requiring an isolation resistor - verified per the manufacturer's Typical Operating Characteristics and Stability section.
How does the shutdown feature of MAX4251ESA-G126 behave electrically?
When the SHDN pin of MAX4251ESA-G126 is pulled low (≤0.2 × VDD), the amplifier enters shutdown mode: quiescent supply current drops to 0.5µA (typical), and the output is placed in a high-impedance state. This behavior is confirmed in the Electrical Characteristics table and allows safe multiplexing or power-gating without loading downstream circuitry.
Is MAX4251ESA-G126 pin-compatible with other devices in the MAX4249–MAX4257 family?
MAX4251ESA-G126 shares the same 8-pin SO pinout with MAX4251EUA+, MAX4256ESA+, and MAX4257ESA+, but differs from MAX4250 variants (5-pin SOT23) and UCSP-packaged parts. Its pin configuration (OUT, IN−, IN+, VSS, SHDN, VDD, N.C., N.C.) is consistent across all 8-pin SO versions in the family, enabling drop-in replacement where shutdown functionality and channel count match.
MAX4251ESA-G126 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- -
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 420µA
- Current - Output / Channel:
- 68 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4251ESA-G126 FAQ
1.How can I place an order for MAX4251ESA-G126 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4251ESA-G126 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 MAX4251ESA-G126 reliable?
The price and inventory of MAX4251ESA-G126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4251ESA-G126 is usually 5 days.
3.What payment methods are accepted for MAX4251ESA-G126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4251ESA-G126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4251ESA-G126?
MAX4251ESA-G126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4251ESA-G126 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 MAX4251ESA-G126?
For technical support, including MAX4251ESA-G126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4251ESA-G126 requirements.
6.How does Aetrix verify that MAX4251ESA-G126 is sourced from the original manufacturer or authorized distributors?
All MAX4251ESA-G126 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 MAX4251ESA-G126 meets industry standards.
7.What is the process for return or replacement of MAX4251ESA-G126?
All MAX4251ESA-G126 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4251ESA-G126, 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 MAX4251ESA-G126 part is unused and in its original packaging.
Return procedure for MAX4251ESA-G126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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