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Analog Devices Inc./Maxim Integrated MAX4251EUA
- Part No.:
- MAX4251EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4251EUA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,366
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Product details
Overview
MAX4251EUA from Analog Devices is a single, low-noise, low-distortion, rail-to-rail output operational amplifier optimized for battery-powered instrumentation. It delivers 0.0002% THD at 1kHz, 7.9nV/√Hz input voltage-noise density at 30kHz, and 400µA quiescent supply current per amplifier while operating from 2.4V to 5.5V. Its shutdown mode reduces supply current to 0.5µA and places the output in high-impedance state-ideal for portable medical sensors and ADC front-ends.
For engineers reviewing the MAX4251EUA datasheet, MAX4251EUA pinout, MAX4251EUA application, or MAX4251EUA equivalent, this page provides verified circuit role (single-channel precision op amp), package mapping (8-pin µMAX), key performance boundaries (3MHz GBW, unity-gain stable, ±1pA input bias), and real-world design implications of rail-to-rail swing, ground-sensing inputs, and capacitive-load stability up to 400pF.
Technical Context
The MAX4251EUA belongs to the MAX4249–MAX4257 family of single-supply op amps with true rail-to-rail outputs and input common-mode range extending to ground. It is unity-gain stable with a 3MHz gain-bandwidth product and 0.3V/µs slew rate-distinct from higher-speed decompensated variants (e.g., MAX4256) requiring ≥10V/V gain.
It features integrated shutdown control (SHDN pin), enabling ultra-low-power operation in intermittent-sampling systems. Input stage uses FET-based topology yielding 1pA typical input bias current and 1000GΩ differential input resistance, supporting high-impedance sensor interfacing without significant DC error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - sets maximum usable closed-loop bandwidth at unity gain; supports stable signal conditioning up to ~1MHz with AV = 3. |
| Input Voltage-Noise Density | 7.9nV/√Hz at 30kHz - enables <1µV RMS noise contribution in 10kHz bandwidth, critical for 16-bit ADC buffer applications. |
| THD+N | 0.0004% at 1kHz, 2VP-P into 1kΩ - ensures minimal harmonic corruption in audio and precision analog signal paths. |
| Quiescent Supply Current | 400µA per amplifier - allows continuous operation for >1 year on a 200mAh coin cell in low-duty-cycle portable devices. |
| Output Swing | Within 8mV of rails with 10kΩ load - preserves full dynamic range in 3.3V or lower supply systems, maximizing SNR. |
| Input Common-Mode Range | Includes ground (VSS) to VDD − 1.1V - permits direct interfacing with 0V-referenced sensors (e.g., strain gauges, thermocouples). |
| Capacitive-Load Drive | Stable up to 400pF - eliminates need for external isolation resistors in most PCB trace and filter-capacitor scenarios. |
Pinout & Package
MAX4251EUA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), RoHS-compliant and lead-free. The µMAX footprint is pin-compatible with industry-standard SO-8 but offers 50% smaller area and improved thermal performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Rail-to-rail output capable of sourcing/sinking ±5mA; high-impedance when SHDN = low. |
| 2 | N.C. | No internal connection; must be left unconnected or grounded per layout best practice. |
| 3 | VSS | Negative supply terminal; connect directly to system ground in single-supply configurations. |
| 4 | IN− | Inverting input; 11pF input capacitance requires feed-forward compensation (CZ) if RG||RF > 20kΩ. |
| 5 | IN+ | Noninverting input; high-impedance node (1000GΩ) suitable for piezoelectric or pH sensor interfaces. |
| 6 | VDD | Positive supply (2.4V–5.5V); requires local 0.1µF ceramic bypass capacitor. |
| 7 | SHDN | Active-low shutdown control; pulls supply current to 0.5µA when driven ≤0.2×VDD. |
| 8 | N.C. | No internal connection; no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal headroom down to 2.4V supplies-enables direct interface with low-voltage SAR ADCs without level-shifting. |
| Ground-sensing input | Common-mode range includes VSS, eliminating need for input biasing networks when measuring signals referenced to ground. |
| Low-power shutdown | Reduces total system quiescent current by >99.8% during idle periods-critical for battery life in wearable health monitors. |
| 400pF capacitive-load stability | Supports direct driving of anti-aliasing filters and long PCB traces without external compensation components. |
| Ultra-low input bias current | 1pA typical (≤50pA over −40°C to +85°C) minimizes voltage error across high-value feedback networks used in transimpedance amplifiers. |
Applications
| Portable Medical Sensors | ADC Front-End Buffer |
|---|---|
Use Scenario: Signal conditioning for ECG electrode inputs in handheld patient monitors. IC Role / Device Role / Timing Role: Single-ended buffer isolating high-impedance electrode nodes from 16-bit ADC sampling circuitry. Use Value: 7.9nV/√Hz noise and 0.0004% THD preserve microvolt-level cardiac waveforms; rail-to-rail swing maximizes utilization of 3.3V ADC reference. | Use Scenario: Driving the input of a MAX195 16-bit serial ADC in portable data loggers. IC Role / Device Role / Timing Role: Precision unity-gain buffer ensuring stable settling within 6.7µs to 0.01% for accurate sample-and-hold acquisition. Use Value: 3MHz GBW and 0.3V/µs slew rate guarantee full-scale step response fidelity; 1pA input bias avoids offset drift in high-RG configurations. |
| Digital Strain Gauge Interface | Low-Voltage PA Control Loop |
Use Scenario: Amplifying mV-level Wheatstone bridge outputs in handheld torque wrenches. IC Role / Device Role / Timing Role: Instrumentation-grade gain stage with matched input impedance and low DC error. Use Value: 70µV max input offset and 0.3µV/°C tempco ensure sub-0.1% measurement accuracy across industrial temperature range. | Use Scenario: Closed-loop feedback sensing in Class AB power amplifier bias control circuits. IC Role / Device Role / Timing Role: High-PSRR (≥75dB) error amplifier regulating quiescent current under varying supply conditions. Use Value: 75–100dB PSRR suppresses supply ripple-induced distortion; shutdown mode enables fast power cycling during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4256EUA+ | 22MHz GBW, stable only at AV ≥ 10V/V; higher slew rate (2.1V/µs); no unity-gain capability. | Better suited for high-gain, wideband active filters-not recommended for unity-gain buffers or low-frequency sensor amps. | Select MAX4256EUA+ only when closed-loop gain ≥ 10V/V and bandwidth >1MHz is required; avoid for ADC buffering or ground-referenced sources. |
| OPA333AIDBVR | Zero-drift architecture; 0.1µV/°C offset drift; 17µV max VOS; 350µA IQ; 350kHz GBW; no shutdown pin. | Superior DC precision for ultra-low-drift applications; insufficient bandwidth/noise performance for audio or fast ADC support. | Choose OPA333AIDBVR for DC-critical applications like precision weight scales; use MAX4251EUA+ where speed, noise, and shutdown are prioritized over zero-drift. |
Compared with MAX4256EUA+, MAX4251EUA offers guaranteed unity-gain stability and lower noise floor-making it superior for ADC drivers and sensor interfaces. Against OPA333AIDBVR, MAX4251EUA trades ultra-low drift for 10× higher bandwidth and integrated shutdown, better fitting portable instrumentation with dynamic signal content.
Availability
MAX4251EUA is available at Aetrix Electronics and suitable for portable medical sensors, ADC front-end buffering, digital strain gauge interfaces, and low-voltage PA control loops requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MAX4251EUA 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX4249–MAX4257 product line was engineered specifically for low-power, low-noise, rail-to-rail signal conditioning in portable and battery-operated instrumentation-emphasizing precision, efficiency, and ease of integration in space-constrained designs.
FAQ
What is the maximum capacitive load the MAX4251EUA can drive without oscillation?
The MAX4251EUA maintains stability with capacitive loads up to 400pF without external compensation. This specification is verified across temperature and supply voltage ranges and eliminates the need for isolation resistors in typical PCB layouts, filter networks, and cable-driven applications-provided the feedback network impedance remains below 20kΩ to avoid phase-margin degradation.
Does the MAX4251EUA support true rail-to-rail input operation?
The MAX4251EUA does not support rail-to-rail input common-mode range. Its input common-mode voltage range extends from VSS (ground) to VDD − 1.1V, meaning it accepts signals down to ground but cannot handle inputs within 1.1V of the positive rail. However, its rail-to-rail output swing (within 8mV of both rails) and ground-sensing capability make it ideal for single-supply systems interfacing with 0V-referenced sensors.
How does the shutdown feature of the MAX4251EUA affect output state?
When the SHDN pin is pulled low (≤0.2×VDD), the MAX4251EUA reduces supply current to 0.5µA and places the output in a high-impedance state-neither sourcing nor sinking current. This behavior prevents loading of downstream circuitry during sleep modes and enables safe multiplexing of multiple sensors onto shared signal chains without cross-talk or DC path interference.
Can the MAX4251EUA be used with a 2.4V supply in battery-powered applications?
Yes, the MAX4251EUA is fully specified for operation from 2.4V to 5.5V. At 2.4V, it maintains rail-to-rail output swing (within 25mV of rails with 10kΩ load), 0.0004% THD+N, and 400µA quiescent current-making it uniquely suited for single-cell Li-ion (2.7–4.2V) or alkaline (2.4–3.2V) powered devices where supply headroom is constrained and noise performance must remain uncompromised.
What is the input bias current specification of the MAX4251EUA over temperature?
The MAX4251EUA specifies input bias current ≤50pA over the full −40°C to +85°C operating range, with a typical value of 1pA at +25°C. This ultra-low, temperature-stable bias current ensures minimal voltage error across high-value feedback resistors (e.g., 1MΩ), preserving accuracy in transimpedance amplifiers, pH probes, and other high-impedance sensor interfaces where leakage currents would otherwise dominate error budgets.
MAX4251EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 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-uMAX/uSOP
MAX4251EUA FAQ
1.How can I place an order for MAX4251EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4251EUA 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 MAX4251EUA reliable?
The price and inventory of MAX4251EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4251EUA is usually 5 days.
3.What payment methods are accepted for MAX4251EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4251EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4251EUA?
MAX4251EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4251EUA 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 MAX4251EUA?
For technical support, including MAX4251EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4251EUA requirements.
6.How does Aetrix verify that MAX4251EUA is sourced from the original manufacturer or authorized distributors?
All MAX4251EUA 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 MAX4251EUA meets industry standards.
7.What is the process for return or replacement of MAX4251EUA?
All MAX4251EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4251EUA, 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 MAX4251EUA part is unused and in its original packaging.
Return procedure for MAX4251EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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