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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:1,631
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Product details
Overview
MAX4251ESA+T from Analog Devices is a single, low-noise, low-distortion rail-to-rail output operational amplifier optimized for single-supply operation from 2.4V to 5.5V. It delivers 0.0002% THD at 1kHz, 7.9nV/√Hz input voltage-noise density at 30kHz, 400µA quiescent supply current per amplifier, and features a low-power shutdown mode reducing current to 0.5µA - making it ideal for battery-powered instrumentation and ADC buffer stages.
For engineers reviewing the MAX4251ESA+T datasheet, MAX4251ESA+T pinout, MAX4251ESA+T application, or MAX4251ESA+T equivalent, key selection criteria include its unity-gain stability (3MHz GBW), rail-to-rail output swing within 8mV of rails (10kΩ load), ±1pA input bias current, and guaranteed operation over –40°C to +85°C in an 8-pin SO package.
Technical Context
The MAX4251ESA+T belongs to the MAX4249–MAX4257 family of single-supply op amps with true rail-to-rail outputs and ground-sensing inputs. Its input common-mode range extends from VSS to VDD – 1.1V, enabling direct interfacing with sensors referenced to ground. The device uses a push-pull output stage capable of sourcing/sinking ±5mA while maintaining DC accuracy across temperature.
It is unity-gain stable with a 3MHz gain-bandwidth product and 0.3V/µs slew rate. Unlike decompensated variants (e.g., MAX4249/MAX4256), the MAX4251 does not require minimum gain ≥10V/V for stability - simplifying low-gain and unity-gain configurations without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4V to 5.5V single supply - supports direct integration into 3.3V and 5V systems without level-shifting. |
| Gain-Bandwidth Product | 3MHz - enables stable unity-gain operation with adequate bandwidth for audio, sensor, and data-acquisition signal conditioning. |
| Input Offset Voltage | ±0.07mV (typ) - ensures high DC precision in low-level signal amplification (e.g., strain gauge bridges). |
| Input Bias Current | 0.1pA (typ) - minimizes error in high-impedance source interfaces (e.g., piezoelectric transducers, pH electrodes). |
| THD+N @ 1kHz | 0.0004% (RL = 1kΩ) - preserves signal fidelity in high-resolution ADC front-ends up to 16-bit dynamic range. |
| Output Swing | Within 8mV of rails (10kΩ load) - maximizes usable dynamic range in low-voltage systems (e.g., 3.3V portable medical devices). |
| Shutdown Current | 0.5µA - enables microamp-level power gating in duty-cycled sensing nodes. |
Pinout & Package
MAX4251ESA+T is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC outline, 1.27mm pitch, and surface-mount compatibility. Thermal performance supports continuous operation at TA ≤ +85°C with derating above +70°C (471mW max at +70°C, derated 5.88mW/°C).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Rail-to-rail output terminal; drives loads down to 1kΩ while maintaining DC accuracy and 400pF capacitive-load stability. |
| 2 | IN− | Inverting input; 11pF input capacitance requires feed-forward compensation (CZ) when RF || RG > 20kΩ to preserve phase margin. |
| 3 | IN+ | Noninverting input; common-mode range includes ground - enables direct connection to grounded sensors without level shifters. |
| 4 | VSS | Negative supply pin; connect to ground for single-supply operation - no phase reversal guaranteed under overdrive conditions. |
| 5 | SHDN | Active-low shutdown control; pulls outputs to high-impedance state and reduces IQ to 0.5µA when driven low (VIL ≤ 0.2×VDD). |
| 6 | VDD | Positive supply pin; bypass with 0.1µF ceramic capacitor placed adjacent to pin to suppress supply noise coupling. |
| 7 | N.C. | No internal connection - left unconnected; no routing or thermal relief required on PCB. |
| 8 | N.C. | No internal connection - left unconnected; maintains pin compatibility with dual-amplifier variants (e.g., MAX4252). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range in 2.4V–5.5V systems: VOH ≤ VDD – 8mV and VOL ≥ VSS + 7mV (10kΩ load), critical for low-voltage ADC drivers. |
| Ultra-low input current noise | 0.5fA/√Hz enables high-fidelity amplification of ultra-high-impedance sources (e.g., photodiode preamps) without added Johnson noise penalty. |
| Low-power shutdown mode | Reduces total supply current to 0.5µA while placing output in high-Z state - essential for energy harvesting and wake-on-event sensor nodes. |
| Capacitive-load drive capability | Stable with up to 400pF load without external isolation resistor - simplifies filter design and eliminates need for series R in anti-aliasing stages. |
| Ground-sensing input | Input common-mode range extends to VSS − 0.2V - allows direct interface with 0V-referenced transducers (e.g., thermocouples, bridge sensors) without input bias networks. |
Applications
| Portable Medical Sensors | 16-bit ADC Front-Ends |
|---|---|
Use Scenario: Amplifying low-level bio-potential signals (e.g., ECG, EEG) in handheld diagnostic devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail output driving SAR ADC reference buffers. Use Value: 0.0002% THD and 7.9nV/√Hz noise preserve microvolt-level signal integrity; 400µA IQ extends battery life beyond 100 hours per charge. | Use Scenario: Buffering analog inputs to 16-bit successive-approximation ADCs in industrial data loggers. IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating high-impedance sensor outputs from ADC sampling capacitance. Use Value: ±1pA input bias current prevents offset drift in high-R sensor networks; 3MHz GBW ensures settling <6.7µs to 0.01% for 2V step. |
| Digital Strain Gauge Interfaces | Battery-Powered PA Control Loops |
Use Scenario: Conditioning Wheatstone bridge outputs in portable weighing scales and structural health monitors. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier front-end (with external gain resistors) for mV-level differential signals. Use Value: ±0.07mV VOS and 0.3µV/°C TCVOS minimize temperature-induced calibration drift; rail-to-rail output fully utilizes 3.3V ADC input range. | Use Scenario: Closed-loop feedback amplification in Class AB power amplifier bias control circuits for wireless handsets. IC Role / Device Role / Timing Role: Fast-settling, low-noise error amplifier comparing PA output to reference in envelope tracking systems. Use Value: 0.3V/µs slew rate and 3MHz GBW support 20kHz modulation bandwidth; shutdown mode disables amplifier during transmit gaps to save µA-level current. |
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 GBW (22MHz), decompensated for AV ≥ 10V/V only - requires minimum gain configuration and external compensation for stability. | Suitable for higher-speed, fixed-gain signal chains (e.g., active filters, IF amplifiers), not unity-gain buffers. | Select MAX4256ESA+ only when closed-loop gain ≥10V/V is acceptable and bandwidth >3MHz is required. |
| OPA333AIDBVR | Zero-drift architecture; 0.1µV/°C offset drift vs. MAX4251's 0.3µV/°C; higher IQ (17µA); no shutdown pin. | Better for ultra-low-drift DC applications (e.g., precision weigh scales), but unsuitable for battery-constrained designs requiring µA shutdown. | Choose OPA333AIDBVR when long-term DC stability outweighs power budget constraints and shutdown functionality is unnecessary. |
Compared with MAX4256ESA+, the MAX4251ESA+T offers plug-and-play unity-gain stability and lower quiescent current, while OPA333AIDBVR trades 400× higher supply current for sub-microvolt drift - making MAX4251ESA+T optimal for portable, moderate-precision, low-power signal conditioning where simplicity and battery life are prioritized.
Availability
MAX4251ESA+T is available at Aetrix Electronics and suitable for portable medical sensors, 16-bit ADC front-ends, digital strain gauge interfaces, and battery-powered PA control loops requiring stable component supply with full traceability and lifecycle management.
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 since 1965.
The MAX4249–MAX4257 family was designed specifically for low-noise, low-distortion, single-supply signal conditioning in portable and battery-powered instrumentation - emphasizing rail-to-rail output, ground-sensing input, and µA-level shutdown capability.
FAQ
What is the operating temperature range for the MAX4251ESA+T?
The MAX4251ESA+T is specified for operation from –40°C to +85°C. This industrial temperature range is validated per the manufacturer's datasheet and applies to all electrical characteristics unless otherwise noted. The device is not rated for automotive-grade operation (–40°C to +125°C), which is reserved for variants like MAX4250AAUK+T.
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 accepts inputs down to ground (or slightly below) but not up to the positive rail. This ground-sensing capability enables direct interface with 0V-referenced sensors, but high-side sensing near VDD requires attenuation or level shifting.
Can the MAX4251ESA+T drive a 1kΩ load while maintaining rail-to-rail output swing?
Yes, the MAX4251ESA+T can drive a 1kΩ load while preserving rail-to-rail output swing, though with reduced voltage margins: typical VOL = VSS + 47mV and VOH = VDD – 77mV at 5V supply. For full 8mV rail margin, a 10kΩ load is recommended. The device delivers ±5mA output current, ensuring robust drive capability for moderate-impedance loads without external buffering.
Is feed-forward compensation required for stable operation of the MAX4251ESA+T?
Feed-forward compensation (CZ) is recommended when the parallel resistance at the inverting input (RF || RG) exceeds 20kΩ - particularly in unity-gain or low-gain configurations. CZ = 11pF × (RF/RG) cancels the pole introduced by the 11pF input capacitance. Without it, phase margin degradation may cause peaking or oscillation. The MAX4251ESA+T remains stable without CZ for RF || RG ≤ 20kΩ.
What is the maximum capacitive load the MAX4251ESA+T can drive without external isolation?
The MAX4251ESA+T is stable driving capacitive loads up to 400pF without external isolation components. This is confirmed in the datasheet's "Capacitive-Load Stability" specification and Typical Operating Characteristics (Figure 12). Loads exceeding 400pF require a series isolation resistor (RISO) - e.g., 150Ω for 1000pF - to maintain phase margin and prevent peaking.
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:
- Active
- 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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