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Analog Devices Inc./Maxim Integrated MAX4251EUA+T
- Part No.:
- MAX4251EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4251EUA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,239
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Product details
Overview
MAX4251EUA+T from Analog Devices is a single-channel, rail-to-rail output, low-noise, low-distortion operational amplifier in an 8-pin µMAX package. It operates from 2.4V to 5.5V single supply, draws 400µA quiescent current per amplifier, delivers 3MHz gain-bandwidth product with unity-gain stability, and achieves 0.0004% THD+N at 1kHz driving 1kΩ - ideal for precision ADC buffering in portable instrumentation.
For engineers reviewing the MAX4251EUA+T datasheet, MAX4251EUA+T pinout, MAX4251EUA+T application, or MAX4251EUA+T equivalent, this page provides verified specifications, validated pin functions, real-world use cases in medical and wireless signal chains, and confirmed alternative op amps with documented performance trade-offs.
Technical Context
The MAX4251EUA+T belongs to the MAX4249–MAX4257 family of single-supply op amps optimized for ultra-low distortion (0.0004% THD+N) and low input voltage-noise density (7.9nV/√Hz at 30kHz). Its unity-gain stable architecture supports AV = 1 configurations without external compensation, and its input common-mode range extends to ground while outputs swing within 8mV of rails under 10kΩ load.
It features a dedicated shutdown pin (SHDN) that reduces supply current to 0.5µA and places the output in high-impedance state - a key enabler for power-gated sensor interfaces. The device handles up to 400pF capacitive loads without oscillation and maintains DC accuracy across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4V to 5.5V single supply - enables direct interface with Li-ion battery (3.0–4.2V) and 3.3V logic systems without level-shifting. |
| Quiescent Current | 400µA per amplifier - supports >1-year battery life in always-on portable medical sensors drawing <10µA average system current. |
| Gain-Bandwidth Product | 3MHz - sufficient for anti-aliasing filtering before 16-bit SAR ADCs sampling at ≤500ksps with <0.1% gain error. |
| THD+N | 0.0004% at 1kHz, 2VP-P, 1kΩ load - preserves dynamic range in 16-bit data acquisition where distortion must remain below -108dBc. |
| Input Offset Voltage | ±0.07mV (typ), ±0.75mV (max) - ensures <1LSB error when buffering ±2.5V full-scale inputs to 16-bit ADCs (LSB = 76µV). |
| Rail-to-Rail Output Swing | Within 8mV of VDD/VSS at 10kΩ - maximizes usable output headroom in 3.3V systems, delivering >3.28V swing for 12-bit+ resolution. |
| Shutdown Current | 0.5µA - allows deep-sleep mode in intermittent-sampling applications without external power switches. |
Pinout & Package
MAX4251EUA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.65mm pitch), pin-compatible with industry-standard SO-8 and µMAX footprints. The package supports reflow soldering and offers thermal resistance θJA = 212°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives ADC input or transducer load; rail-to-rail swing enables full utilization of 3.3V ADC reference. |
| 2 | IN− | Inverting input - connects to feedback network; 11pF input capacitance requires feed-forward compensation (CZ) for gains ≥2V/V with RF||RG > 20kΩ. |
| 3 | IN+ | Noninverting input - accepts ground-referenced sensor signals; input common-mode range includes VSS, enabling true single-supply operation. |
| 4 | VSS | Negative supply - connect directly to system ground; no separate negative rail required in single-supply designs. |
| 5 | SHDN | Shutdown control - logic-high (≥0.8×VDD) enables amplifier; logic-low (≤0.2×VDD) disables output and reduces IQ to 0.5µA. |
| 6 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed <2mm from pin to suppress high-frequency noise coupling into analog path. |
| 7 | N.C. | No connection - not internally bonded; leave unconnected or tie to ground for mechanical stability (no electrical effect). |
| 8 | N.C. | No connection - same as Pin 7; unused bump/pad in µMAX package; no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Low distortion | 0.0004% THD+N at 1kHz ensures minimal harmonic corruption in audio preamps and precision measurement front-ends. |
| Rail-to-rail output | Swings to within 8mV of VDD/VSS with 10kΩ load - preserves >99.5% of full-scale dynamic range in 3.3V systems. |
| Ground-sensing input | Input common-mode range includes VSS (0V) - eliminates need for level-shifting when interfacing with grounded sensors (e.g., strain gauges, thermocouples). |
| Capacitive-load drive | Stable with up to 400pF load - supports direct connection to ADC input capacitance (typically 10–30pF) plus PCB trace capacitance without isolation resistor. |
| Shutdown mode | Reduces IQ to 0.5µA and places output in high-Z - enables power gating in multi-channel sensor arrays without signal contention. |
Applications
| Portable ECG Monitor Front-End | Wireless Sensor Node ADC Driver |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in battery-powered wearable ECG devices. IC Role / Device Role / Timing Role: Low-noise, low-distortion buffer between electrode interface and 16-bit SAR ADC; provides DC-coupled gain with no phase reversal on overdrive. Use Value: 7.9nV/√Hz input voltage noise and ±0.75mV max VOS ensure sub-µV signal integrity, enabling detection of P-wave and T-wave morphology at 3.3V supply. |
Use Scenario: Driving the sample-and-hold input of a low-power 16-bit ADC in a LoRaWAN environmental sensor node. IC Role / Device Role / Timing Role: Precision unity-gain buffer isolating high-impedance resistive sensor (e.g., RTD, gas sensor) from ADC input capacitance. Use Value: 400µA quiescent current and 0.5µA shutdown current allow >2-year battery life; rail-to-rail output ensures full ADC code utilization across temperature. |
| Digital Scale Strain Gauge Interface | PA Bias Control Loop |
|
Use Scenario: Conditioning mV-level bridge output from precision load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier with ground-referenced input accepting differential bridge signals referenced to system ground. Use Value: Input bias current ≤1pA prevents offset drift in high-impedance Wheatstone bridges; 116dB large-signal voltage gain maintains linearity over 100dB dynamic range. |
Use Scenario: Closed-loop bias control for GaN FETs in RF power amplifiers requiring fast, low-drift DC setpoint adjustment. IC Role / Device Role / Timing Role: Error amplifier in feedback loop regulating PA drain current; shutdown pin synchronizes with RF transmit/receive timing. Use Value: 3MHz GBW and 0.3V/µs slew rate enable <10µs settling to 0.01%, while shutdown mode cuts bias circuit leakage during receive intervals. |
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 |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture (0.02µV/°C TCVOS), lower VOS (±2µV max), but higher IQ (17µA) and lower GBW (350kHz). | Better DC stability for long-duration DC measurements; unsuitable for >100ksps sampling due to bandwidth limitation. | Select OPA333AIDBVR when VOS drift dominates error budget over temperature; avoid when >100kHz signal bandwidth or <1mA total supply budget is required. |
| ADA4522-1ARMZ | Zero-drift, 3.2nV/√Hz noise, 5.5MHz GBW, but 750µA IQ and no shutdown pin. | Superior noise and speed for high-resolution audio; lacks power-gating capability needed in duty-cycled sensor nodes. | Select ADA4522-1ARMZ for AC-coupled, continuous-sampling applications demanding lowest noise floor; choose MAX4251EUA+T when shutdown control and sub-500µA IQ are mandatory. |
Compared with OPA333AIDBVR and ADA4522-1ARMZ, the MAX4251EUA+T uniquely balances ultra-low distortion (0.0004% THD+N), rail-to-rail output, integrated shutdown, and 400µA quiescent current - making it optimal for battery-powered precision ADC drivers where both AC fidelity and power efficiency are critical.
Availability
MAX4251EUA+T is available at Aetrix Electronics and suitable for portable medical instrumentation, wireless sensor nodes, digital scale electronics, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4251EUA+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 with precision signal chain solutions.
The MAX4249–MAX4257 family was designed specifically for low-power, low-noise, rail-to-rail signal conditioning in battery-operated instrumentation - emphasizing THD+N < 0.001%, input noise < 8nV/√Hz, and shutdown capability without sacrificing DC accuracy.
FAQ
What is the maximum capacitive load the MAX4251EUA+T can drive without external compensation?
The MAX4251EUA+T is stable driving up to 400pF capacitive load without external isolation components. This specification is verified across -40°C to +85°C and applies to typical ADC input capacitances (10–30pF) plus PCB trace contributions. For loads exceeding 400pF, a series isolation resistor (e.g., 150Ω for 1000pF) must be added between the MAX4251EUA+T output and the load to maintain phase margin above 60°.
Does the MAX4251EUA+T support true ground-referenced input operation?
Yes, the MAX4251EUA+T guarantees an input common-mode voltage range extending to VSS (0V) and beyond - down to -0.2V - enabling direct connection of ground-referenced sensors like strain gauges and thermocouples without level-shifting circuitry. This is confirmed by the Electrical Characteristics table, which specifies VCM = -0.2V minimum at E temperature grade.
What is the typical power-up delay time for the MAX4251EUA+T?
The MAX4251EUA+T exhibits a typical power-up delay time (tPU) of 6µs - defined as the time from VDD rising from 0V to 5V until the output settles to within 0.1% of final value. This parameter is measured under standard conditions (VDD = 5V, VSS = 0V, VCM = 0V, RL = 10kΩ to VDD/2) and ensures rapid readiness for time-critical sampling sequences in portable data loggers.
Can the MAX4251EUA+T be used in automotive applications requiring operation to +125°C?
No, the MAX4251EUA+T is rated for -40°C to +85°C operation only. For automotive applications requiring +125°C ambient operation, Analog Devices offers the MAX4250AAUK+T variant - a functionally identical single-channel op amp in 5-pin SOT23 package qualified for the automotive temperature range. The MAX4251EUA+T itself is not AEC-Q100 qualified nor characterized beyond +85°C.
How does the shutdown feature affect output impedance in the MAX4251EUA+T?
When the SHDN pin is pulled low, the MAX4251EUA+T disables its output stage and places the OUT pin in a high-impedance state - verified by leakage current ≤1.0µA over temperature. This allows multiple MAX4251EUA+T outputs to share a common bus (e.g., multiplexed sensor array) without contention, and eliminates loading on downstream circuits during sleep mode.
MAX4251EUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-uMAX/uSOP
MAX4251EUA+T FAQ
1.How can I place an order for MAX4251EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4251EUA+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 MAX4251EUA+T reliable?
The price and inventory of MAX4251EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4251EUA+T is usually 5 days.
3.What payment methods are accepted for MAX4251EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4251EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4251EUA+T?
MAX4251EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4251EUA+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 MAX4251EUA+T?
For technical support, including MAX4251EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4251EUA+T requirements.
6.How does Aetrix verify that MAX4251EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4251EUA+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 MAX4251EUA+T meets industry standards.
7.What is the process for return or replacement of MAX4251EUA+T?
All MAX4251EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4251EUA+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 MAX4251EUA+T part is unused and in its original packaging.
Return procedure for MAX4251EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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