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Analog Devices Inc./Maxim Integrated MAX4251ESA-T
- Part No.:
- MAX4251ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4251ESA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
MAX4251ESA-T from Analog Devices is a single-channel, rail-to-rail output, low-noise, low-distortion operational amplifier optimized for single-supply operation from 2.4V to 5.5V. It delivers 400µA quiescent current per amplifier, 0.0002% THD at 1kHz, 7.9nV/√Hz input voltage-noise density at 30kHz, and 3MHz gain-bandwidth product while remaining unity-gain stable - making it ideal for portable instrumentation and ADC buffer stages in battery-powered medical or wireless sensor systems.
For engineers reviewing the MAX4251ESA-T datasheet, MAX4251ESA-T pinout, MAX4251ESA-T application, or MAX4251ESA-T equivalent, key selection criteria include its shutdown capability (0.5µA supply current), rail-to-rail output swing within 8mV of rails (10kΩ load), ±1pA input bias current, and guaranteed operation over –40°C to +85°C - all critical for precision, low-power signal conditioning in space-constrained designs.
Technical Context
The MAX4251ESA-T belongs to the MAX4249–MAX4257 family of single-supply op amps featuring true rail-to-rail output stages and ground-sensing inputs (common-mode range includes VSS). Its internal compensation ensures unity-gain stability, distinguishing it from decompensated variants (e.g., MAX4256) that require ≥10V/V gain. The device supports low-power shutdown via SHDN pin, reducing supply current to 0.5µA and placing the output in high-impedance state.
It drives resistive loads down to 1kΩ while maintaining DC accuracy and handles capacitive loads up to 400pF without oscillation. Input offset voltage is specified at ±0.07mV (typ), with 0.3µV/°C tempco, and large-signal voltage gain reaches 116dB - enabling high-precision DC-coupled amplification in sensor front-ends and reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4V to 5.5V - enables direct interface with Li-ion, 3.3V, or 5V logic rails without level-shifting. |
| Quiescent Current | 400µA per amplifier - supports multi-day battery life in portable equipment with active signal conditioning. |
| THD+N | 0.0002% at 1kHz, 2VP-P, 1kΩ load - preserves dynamic range in 16-bit ADC applications like medical instrumentation. |
| Input Voltage-Noise Density | 7.9nV/√Hz at 30kHz - minimizes added noise when amplifying low-level transducer signals (e.g., strain gauges). |
| Gain-Bandwidth Product | 3MHz - sufficient for anti-aliasing filters, sensor gain stages, and audio preamps up to ~100kHz closed-loop bandwidth. |
| Output Swing | Within 8mV of rails (10kΩ load) - maximizes usable signal headroom in low-voltage systems (e.g., 3V ADC references). |
| Input Bias Current | ±1pA (typ) - prevents significant error when buffering high-impedance sources such as piezoelectric sensors or pH electrodes. |
Pinout & Package
The MAX4251ESA-T is housed in an 8-pin SO (Small Outline) package with exposed pad, compatible with standard PCB reflow processes and offering robust thermal performance for continuous operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail capable, high-impedance during shutdown. |
| 2 | IN− | Inverting input - matched to IN+ for low offset; accepts common-mode voltages down to VSS − 0.2V. |
| 3 | IN+ | Noninverting input - high-impedance node; critical for minimizing loading on high-Z sources. |
| 4 | VSS | Negative supply - connect directly to ground in single-supply configurations. |
| 5 | SHDN | Shutdown control - logic-high (≥0.8×VDD) enables amplifier; logic-low (≤0.2×VDD) activates 0.5µA shutdown mode. |
| 6 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed near pin for noise immunity. |
| 7 | N.C. | No connection - not internally bonded; leave unconnected or float. |
| 8 | N.C. | No connection - not internally bonded; leave unconnected or float. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range in low-voltage systems: outputs reach within 8mV of VDD and VSS under 10kΩ load. |
| Low-power shutdown mode | Reduces supply current to 0.5µA and places output in high-impedance state - essential for power-gating in multi-stage analog chains. |
| Ultra-low input bias current | 1pA typical enables accurate amplification of signals from high-impedance sources (e.g., >1GΩ pH probes or piezo elements) without significant DC error. |
| 400pF capacitive-load drive | Stable operation into heavy capacitive loads (e.g., long traces, ADC input capacitance) eliminates need for external isolation resistors below this threshold. |
| Unity-gain stable architecture | Guaranteed stability at AV = 1 simplifies design of voltage followers, active filters, and precision buffers without external compensation components. |
Applications
| Portable Medical Sensors | Wireless Transceiver IF Amplifiers |
|---|---|
Use Scenario: Signal conditioning for ECG electrode interfaces or blood glucose meter analog front-ends operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier buffering microvolt-level biopotential signals before 16-bit ADC conversion. Use Value: 7.9nV/√Hz input noise and ±1pA bias current preserve SNR and minimize baseline drift across temperature - critical for diagnostic-grade accuracy. | Use Scenario: Intermediate-frequency (IF) gain stage in Bluetooth/Wi-Fi RF modules where linearity and power efficiency are jointly constrained. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail op amp providing fixed-gain amplification of 2.4GHz receiver IF signals prior to demodulation. Use Value: 0.0002% THD at 1kHz and 3MHz GBW ensure minimal harmonic distortion and adequate bandwidth for narrowband IF signals up to ~300kHz. |
| ADC Driver for Precision Data Acquisition | Digital Scale Strain Gauge Interface |
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX195) in industrial process monitoring systems requiring <1 LSB error. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance sensor outputs from ADC sampling capacitance. Use Value: Rail-to-rail output swing and 116dB large-signal voltage gain maintain full-scale fidelity; 400µA quiescent current supports always-on acquisition modes. | Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells in handheld digital scales. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end stage with low offset and ultra-low noise. Use Value: ±0.07mV input offset and 0.3µV/°C tempco limit zero-point drift; 7.9nV/√Hz noise ensures resolution better than 1 part in 100,000 over 10Hz–1kHz band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4256ESA+ | Higher 22MHz GBW, decompensated (min gain = 10V/V), same shutdown and noise specs. | Better suited for higher-frequency closed-loop applications (e.g., active filters >100kHz), but requires gain ≥10 and external compensation for stability. | Select MAX4256ESA+ only if bandwidth >3MHz is required and gain configuration permits ≥10V/V; otherwise MAX4251ESA-T offers simpler unity-gain deployment. |
| OPA333AIDBVR | Zero-drift architecture, 17µV max VOS, 0.1µV/°C drift, 6.5µA IQ - significantly higher quiescent current, no shutdown pin. | Ideal for ultra-low-offset DC applications (e.g., precision weight scales), but unsuitable for battery-constrained systems needing sub-µA shutdown. | Choose OPA333AIDBVR when offset drift dominates system error budget and power is secondary; avoid when shutdown functionality or <1µA sleep current is mandatory. |
Compared with MAX4256ESA+, the MAX4251ESA-T trades bandwidth for unity-gain simplicity and lower dynamic power; versus OPA333AIDBVR, it sacrifices zero-drift precision for 13× lower quiescent current and integrated shutdown - making it optimal for portable, moderate-accuracy, always-on sensing nodes.
Availability
MAX4251ESA-T is available at Aetrix Electronics and suitable for portable medical devices, wireless communications infrastructure, and precision industrial data acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for MAX4251ESA-T 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 family was designed specifically for low-noise, low-distortion, single-supply signal conditioning in portable and battery-operated instrumentation - emphasizing rail-to-rail output, ground-sensing input, and micropower shutdown.
FAQ
What is the operating temperature range for the MAX4251ESA-T?
The MAX4251ESA-T is rated for operation from –40°C to +85°C, as confirmed by its ordering code "ESA" designation and electrical specifications tested across this range. This makes the MAX4251ESA-T suitable for commercial and industrial environments, including handheld test equipment and outdoor sensor nodes where ambient temperatures vary widely. The device maintains full parametric performance - including THD, noise, and offset - throughout this interval.
Does the MAX4251ESA-T support rail-to-rail input operation?
No, the MAX4251ESA-T does not support rail-to-rail input operation. Its input common-mode voltage range extends from VSS − 0.2V to VDD − 1.1V, meaning it includes ground but does not reach the positive rail. This ground-sensing capability allows use with single-ended inputs referenced to system ground, but the noninverting input must remain at least 1.1V below VDD. The MAX4251ESA-T's rail-to-rail behavior applies only to the output stage.
Can the MAX4251ESA-T drive a 1kΩ load while maintaining DC accuracy?
Yes, the MAX4251ESA-T is explicitly characterized to drive 1kΩ loads while preserving DC accuracy - as verified in its Electrical Characteristics table under "Output Voltage Swing" and "Large-Signal Voltage Gain" parameters. At VDD = 5V, it delivers ±5mA output current and maintains 116dB open-loop gain into 1kΩ, ensuring minimal gain error and linearity degradation. This capability is critical for driving ADC reference buffers or low-impedance transducer interfaces without external gain staging.
What is the shutdown current consumption of the MAX4251ESA-T?
The MAX4251ESA-T draws 0.5µA (typical) and up to 1.5µA (max) in shutdown mode when the SHDN pin is pulled to VSS, as specified in the Electrical Characteristics table. This ultra-low standby current enables multi-year battery life in intermittently active systems such as IoT sensor beacons or portable diagnostic tools. During shutdown, the output enters a high-impedance state, preventing loading of downstream circuitry.
Is the MAX4251ESA-T pin-compatible with other op amps in the MAX4249–MAX4257 family?
No, the MAX4251ESA-T is not universally pin-compatible across the MAX4249–MAX4257 family. While it shares the same 8-pin SO package footprint with MAX4256ESA+ and MAX4257ESA+, its pinout differs from dual-channel variants (e.g., MAX4252) and decompensated parts (e.g., MAX4249). Specifically, pins 7 and 8 are N.C. on MAX4251ESA-T but carry SHDNB and additional I/O on multi-channel versions. Always verify pin function mapping using the official Pin/Bump Configurations table before board reuse.
MAX4251ESA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
MAX4251ESA-T FAQ
1.How can I place an order for MAX4251ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4251ESA-T 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-T reliable?
The price and inventory of MAX4251ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4251ESA-T is usually 5 days.
3.What payment methods are accepted for MAX4251ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4251ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4251ESA-T?
MAX4251ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4251ESA-T 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-T?
For technical support, including MAX4251ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4251ESA-T requirements.
6.How does Aetrix verify that MAX4251ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX4251ESA-T 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-T meets industry standards.
7.What is the process for return or replacement of MAX4251ESA-T?
All MAX4251ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4251ESA-T, 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-T part is unused and in its original packaging.
Return procedure for MAX4251ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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