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Analog Devices Inc./Maxim Integrated MAX4281EUK+
- Part No.:
- MAX4281EUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4281EUK+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:264
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Product details
Overview
MAX4281EUK+ from Maxim Integrated is a single, unity-gain-stable, rail-to-rail output operational amplifier in SOT23-5 package, designed for low-power, precision signal conditioning in single-supply systems. It operates from +2.5V to +5.5V, draws only 320µA (typ) supply current, delivers 2MHz gain-bandwidth product, and features ±17V input fault protection with rail-to-rail output swing into 1kΩ.
For engineers reviewing the MAX4281EUK+ datasheet, MAX4281EUK+ pinout, MAX4281EUK+ application, or MAX4281EUK+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The MAX4281EUK+ is an open-loop op amp-not a fixed-gain amplifier-distinguished from the MAX4174/4175/4274/4275 family by its lack of internal gain-setting resistors and VCC/2 bias network. Its input common-mode range extends from VEE − 0.15V to VCC − 1.2V, and it is unity-gain stable with guaranteed 2MHz GBW at AV = 1V/V.
Unlike GainAmp fixed-gain variants, the MAX4281EUK+ requires external feedback components for closed-loop operation and supports both inverting and noninverting configurations. It exhibits 60dB minimum CMRR and PSRR, 0.5mV max input offset voltage, and stable operation with capacitive loads up to 470pF without isolation resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.5V to +5.5V single supply - enables direct use in battery-powered 3.3V or 5V systems without level-shifting. |
| Supply Current | 320µA (typ) at +5V - supports ultra-low-power portable instrumentation with minimal thermal impact. |
| Gain-Bandwidth Product | 2MHz at AV = 1V/V - ensures stable unity-gain buffer performance with >100kHz usable bandwidth at higher gains. |
| Input Offset Voltage | ±2mV (max) - allows accurate DC-coupled amplification of mV-level sensor signals without trimming. |
| Input Fault Protection | ±17V on IN+/IN− - survives transient overvoltage events in industrial I/O or automotive sensor interfaces. |
| Output Swing | Rail-to-rail into 1kΩ load - maximizes dynamic range in single-supply ADC driver or comparator input stages. |
| Capacitive Load Stability | Stable up to 470pF - drives long PCB traces or ADC input capacitance without external compensation. |
Pinout & Package
SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with exposed pad (not electrically connected), rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN−) | Inverting input | Accepts feedback network; voltage must stay within VEE − 0.15V to VCC − 1.2V to avoid distortion. |
| 2 (IN+) | Noninverting input | Reference node for gain configuration; supports DC- or AC-coupled signal injection. |
| 3 (VEE) | Negative supply / ground | Return path for single-supply operation (0V) or negative rail in dual-supply mode. |
| 4 (OUT) | Amplifier output | Delivers rail-to-rail voltage swing; drives 1kΩ load while maintaining DC accuracy. |
| 5 (VCC) | Positive supply | Connects to +2.5V to +5.5V source; requires 0.1µF bypass capacitor to ground near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable at AV = 1V/V - eliminates need for external compensation in buffer or follower designs. |
| Rail-to-rail output | Swings within 25mV of rails into 1kΩ - preserves full ADC input range in 3.3V systems. |
| ±17V input fault tolerance | No phase reversal or latch-up under ±17V overvoltage - protects against ESD and cable discharge events. |
| Low input bias current | ±10pA (max) - minimizes error in high-impedance photodiode or pH probe front-ends. |
| 470pF capacitive load drive | No isolation resistor required - simplifies layout for driving SAR ADC inputs or long traces. |
Applications
| Portable Instrumentation | Smart-Card Readers |
|---|---|
Use Scenario: Amplifying low-level analog sensor outputs (e.g., thermocouple, strain gauge) in handheld multimeters or data loggers. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner and ADC driver with rail-to-rail output swing. Use Value: Enables full-scale utilization of 12–16-bit ADCs in 3.3V battery-powered devices without external level-shifting. |
Use Scenario: Conditioning analog signals from contactless smart-card RF front-ends before digitization. IC Role / Device Role / Timing Role: Low-noise, fast-settling amplifier for demodulated carrier envelope detection. Use Value: Delivers <1µs settling to 0.01% with 470pF load - meets ISO/IEC 14443 timing requirements for reader response. |
| Low-Side Current Sensing | Photodiode Preamps |
Use Scenario: Amplifying mV-level shunt voltage drops in motor control or power supply monitoring circuits. IC Role / Device Role / Timing Role: High-PSRR, low-offset transimpedance amplifier stage with ±17V fault margin. Use Value: Maintains <0.5% gain accuracy across temperature while surviving load-dump transients. |
Use Scenario: Converting nanoamp-level photocurrents from ambient light or IR sensors into measurable voltage. IC Role / Device Role / Timing Role: Ultra-low-input-bias-current op amp configured as transimpedance amplifier. Use Value: ±10pA max input bias current prevents signal corruption in high-impedance photodiode nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX44260AUT+T | Higher 10MHz GBW, 1.2µA supply current, same SOT23-5 package | Better for >100kHz AC signal chains; less suitable for sub-1µA battery life targets | Select when bandwidth >2MHz is required and power budget allows ~4× higher ICC |
| OPA333AIDBVR | Zero-drift architecture, 0.1µV/°C offset drift, 17µA supply current, SOT23-5 | Superior DC precision for sensor offsets; higher quiescent current limits portable runtime | Choose for µV-level DC stability in precision weigh scales or medical sensors where power is secondary |
Compared with MAX4281EUK+, MAX44260AUT+T trades 3.1× higher supply current for 5× more bandwidth, while OPA333AIDBVR sacrifices 53× higher ICC to achieve 20× lower offset drift - making MAX4281EUK+ optimal for cost-sensitive, battery-constrained applications needing robust ±17V fault tolerance and 2MHz unity-gain stability.
Availability
MAX4281EUK+ is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, and low-side current-sense applications requiring stable component supply, extended temperature support (−40°C to +85°C), and reliable single-supply rail-to-rail performance.
Supply support for MAX4281EUK+ 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 systems.
The MAX4281EUK+ belongs to the GainAmp™ family's open-loop op-amp series, engineered specifically for low-power, fault-tolerant signal conditioning in space-constrained, single-supply environments.
FAQ
What is the maximum capacitive load the MAX4281EUK+ can drive without oscillation?
The MAX4281EUK+ is stable with capacitive loads up to 470pF without requiring an external isolation resistor. This capability simplifies PCB layout when driving ADC input capacitance or long traces. For loads exceeding 470pF, a series isolation resistor (e.g., 100Ω) at the output restores phase margin. The MAX4281EUK+ datasheet confirms no sustained oscillations under these conditions.
Does the MAX4281EUK+ include internal gain-setting resistors like other GainAmp devices?
No, the MAX4281EUK+ is an open-loop op amp and does not contain internal gain-setting resistors. Unlike MAX4174/MAX4175 fixed-gain variants, it requires external feedback components to set closed-loop gain. This gives designers full flexibility in configuring inverting, noninverting, or differential topologies - confirmed in the Functional Diagrams and Pin Description sections of the MAX4281EUK+ datasheet.
What is the input common-mode voltage range for the MAX4281EUK+?
The MAX4281EUK+ supports an input common-mode voltage range from VEE − 0.15V to VCC − 1.2V. At +5V supply, this translates to −0.15V to +3.8V - enabling operation with ground-referenced inputs in single-supply systems. This specification is guaranteed across temperature and is distinct from the wider ranges offered by MAX4175/MAX4275, which include internal VCC/2 biasing.
Can the MAX4281EUK+ be used in dual-supply configurations?
Yes, the MAX4281EUK+ supports dual-supply operation from ±1.25V to ±2.75V. Its absolute maximum ratings allow VCC to VEE spans up to 6V, and its rail-to-rail output stage functions symmetrically with split supplies. When using dual supplies, bypass both VCC and VEE to ground with 0.1µF capacitors placed close to the pins - per the Supply Bypassing section of the MAX4281EUK+ datasheet.
Is the MAX4281EUK+ pin-compatible with MAX4174EUK+ or MAX4175EUK+?
No, the MAX4281EUK+ is not pin-compatible with MAX4174EUK+ or MAX4175EUK+. Although all three share the SOT23-5 package and identical pin numbering, their internal architectures differ: MAX4174/4175 integrate gain resistors and (for MAX4175) VCC/2 bias resistors, connecting IN+ and IN− internally to those networks. The MAX4281EUK+ has fully independent IN+ and IN− terminals - confirmed by the Pin Configurations and Functional Diagrams in the datasheet.
MAX4281EUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.7V/µs
- Gain Bandwidth Product:
- 2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 320µA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX4281EUK+ FAQ
1.How can I place an order for MAX4281EUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4281EUK+ 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 MAX4281EUK+ reliable?
The price and inventory of MAX4281EUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4281EUK+ is usually 5 days.
3.What payment methods are accepted for MAX4281EUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4281EUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4281EUK+?
MAX4281EUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4281EUK+ 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 MAX4281EUK+?
For technical support, including MAX4281EUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4281EUK+ requirements.
6.How does Aetrix verify that MAX4281EUK+ is sourced from the original manufacturer or authorized distributors?
All MAX4281EUK+ 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 MAX4281EUK+ meets industry standards.
7.What is the process for return or replacement of MAX4281EUK+?
All MAX4281EUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4281EUK+, 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 MAX4281EUK+ part is unused and in its original packaging.
Return procedure for MAX4281EUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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