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Analog Devices Inc./Maxim Integrated MAX4281EUK-T
- Part No.:
- MAX4281EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4281EUK-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,881
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Product details
Overview
MAX4281EUK-T from Maxim Integrated is a single, unity-gain-stable, rail-to-rail output operational amplifier in SOT23-5 package, designed for open-loop use in precision signal conditioning. It operates from +2.5V to +5.5V single supply, draws 320µA typical supply current, delivers 2MHz gain-bandwidth product, and supports input common-mode range from VEE − 0.15V to VCC − 1.2V. It is used in portable instrumentation and low-side current-sense front-ends where stability and rail-to-rail swing are critical.
For engineers reviewing the MAX4281EUK-T datasheet, MAX4281EUK-T pinout, MAX4281EUK-T application, or MAX4281EUK-T equivalent, this page provides verified circuit role (open-loop op amp), package mapping (SOT23-5), pin function validation, key AC/DC specifications, real-world application contexts, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX4281EUK-T is an open-loop, unity-gain-stable op amp-not a fixed-gain amplifier-distinguishing it from MAX4174/4175/4274/4275 variants. Its internal compensation ensures stable operation at AV = 1V/V, with 2MHz GBW and 0.7V/µs slew rate. Input stage features high-impedance (1000MΩ) differential pair with ±10nA max input bias current and ±2mV max input offset voltage.
It supports rail-to-rail output swing into 1kΩ load (VOH/VOL ≤ 250mV from rails), exhibits 90dB CMRR and PSRR, and remains stable driving capacitive loads up to 470pF without isolation resistor. Input fault protection is not specified for ±17V-this applies only to fixed-gain GainAmp variants (MAX4174/4175/4274/4275), not MAX4281.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.5V to +5.5V single supply - enables direct integration into 3.3V and 5V systems without level-shifting. |
| Gain-Bandwidth Product | 2MHz - sets usable small-signal bandwidth at unity gain; sufficient for sensor amplification and anti-aliasing filtering up to ~200kHz. |
| Slew Rate | 0.7V/µs - supports clean 1Vpp output at ≤100kHz without slewing distortion in buffered configurations. |
| Input Offset Voltage | ±2mV max - ensures <0.2% error in 1V full-scale DC-coupled measurement paths (e.g., current shunt amplification). |
| Input Bias Current | ±10nA max - allows high-impedance source interfacing (e.g., photodiode preamps) without significant offset drift. |
| Output Swing | Rail-to-rail into 1kΩ - delivers >4.5Vpp output from 5V supply, maximizing dynamic range in single-supply data acquisition. |
| Capacitive Load Stability | Stable up to 470pF - eliminates need for external isolation resistor in most PCB trace and filter capacitor scenarios. |
Pinout & Package
SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with gull-wing leads, optimized for space-constrained portable and battery-powered designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN−) | Inverting input | Accepts feedback network or signal source; input common-mode range extends to VEE − 0.15V, enabling ground-referenced inputs in dual-supply mode. |
| 2 (IN+) | Noninverting input | Reference node for closed-loop configuration; common-mode range extends to VCC − 1.2V, limiting headroom in high-side sensing. |
| 3 (OUT) | Amplifier output | Rail-to-rail capable; drives 1kΩ load while maintaining DC accuracy; stable with ≤470pF capacitive load. |
| 4 (VEE) | Negative supply / ground | Reference for single-supply operation (0V) or negative rail in dual-supply; must be low-impedance for noise immunity. |
| 5 (VCC) | Positive supply | +2.5V to +5.5V input; requires 0.1µF ceramic bypass capacitor placed adjacent to pin for PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable at AV = 1V/V - eliminates need for external compensation in buffer, follower, or active filter applications. |
| Rail-to-rail output | Swings within 250mV of VCC/VEE into 1kΩ - preserves >90% of full-scale ADC input range in 5V systems. |
| Low supply current | 320µA typical - enables always-on monitoring in battery-operated devices with multi-year runtime. |
| High CMRR/PSRR | 90dB min - rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Capacitive load drive | Stable with 470pF - supports direct connection to ADC input filters or long PCB traces without added series resistance. |
Applications
| Portable Instrumentation | Smart-Card Readers |
|---|---|
|
Use Scenario: Signal conditioning of thermistor, RTD, or bridge sensor outputs in handheld multimeters and environmental loggers. IC Role / Device Role / Timing Role: Open-loop op amp configured as precision noninverting amplifier or voltage follower for gain/impedance buffering. Use Value: Rail-to-rail output maximizes ADC utilization; 2MHz GBW supports fast step response during auto-ranging transitions. |
Use Scenario: Amplifying weak analog signals from ISO 7816 smart-card contact interfaces during card insertion detection and protocol handshaking. IC Role / Device Role / Timing Role: Low-noise, low-offset amplifier in analog front-end before digital sampling and CRC verification. Use Value: ±2mV VOS ensures reliable threshold detection across temperature; 320µA ICC extends battery life in portable readers. |
| Low-Side Current-Sense | Infrared Receivers |
|
Use Scenario: Amplifying mV-level shunt voltage in motor control or power supply monitoring, with output referenced to system ground. IC Role / Device Role / Timing Role: Inverting amplifier with precision external resistors to achieve 10–100V/V gain and reject common-mode noise. Use Value: Input common-mode range down to VEE − 0.15V allows direct ground-referenced shunt measurement without level shifters. |
Use Scenario: AC-coupled amplification of modulated IR photodiode signals in remote controls and proximity sensors. IC Role / Device Role / Timing Role: High-speed transimpedance amplifier stage with external feedback resistor and capacitor for bandwidth shaping. Use Value: 0.7V/µs slew rate supports clean 38kHz carrier envelope recovery; 470pF capacitive load stability simplifies photodiode layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar open-loop op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX44260AUT-T | Higher GBW (10MHz), lower VOS (±50µV), but 1.2mA ICC - consumes ~3.7× more current than MAX4281EUK-T. | Preferred for high-speed active filters or precision DAC buffers where bandwidth and offset dominate over power. | Select when >2MHz bandwidth or sub-100µV offset is required; avoid in battery-sensitive designs. |
| TSV911ICT | Lower ICC (80µA), rail-to-rail I/O, but reduced GBW (4MHz) and no ±17V fault protection (not applicable to MAX4281 anyway). | Better suited for ultra-low-power sensor nodes where 4MHz GBW suffices and supply current is primary constraint. | Choose for energy-harvesting or coin-cell applications; verify stability with target capacitive load (400pF spec). |
Compared with MAX44260AUT-T and TSV911ICT, the MAX4281EUK-T delivers optimal balance of bandwidth (2MHz), ultra-low quiescent current (320µA), and proven rail-to-rail output drive in SOT23-5-making it ideal for cost- and size-sensitive portable instrumentation where moderate speed and low power are jointly critical.
Availability
MAX4281EUK-T is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, low-side current-sense circuits, and infrared receivers requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX4281EUK-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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and consumer applications.
The MAX4281EUK-T belongs to the GainAmp™ family's open-loop op amp subgroup, engineered specifically for unity-gain-stable, low-power signal conditioning in space-constrained, battery-operated systems.
FAQ
What is the primary circuit role of the MAX4281EUK-T?
The MAX4281EUK-T is a unity-gain-stable, open-loop operational amplifier-not a fixed-gain amplifier. It functions as a precision analog building block for configurable gain stages, voltage followers, active filters, and sensor interface circuits. Unlike MAX4174/4175 variants, the MAX4281EUK-T contains no internal gain-setting resistors and requires external feedback components to define closed-loop behavior.
Does the MAX4281EUK-T support ±17V input fault protection?
No. ±17V input fault protection is explicitly specified only for the fixed-gain GainAmp variants (MAX4174/MAX4175/MAX4274/MAX4275). The MAX4281EUK-T datasheet does not include this feature; its absolute maximum input voltage is limited to (VEE − 0.3V) to (VCC + 0.3V). For overvoltage-tolerant applications, external clamping or dedicated protection ICs are required.
What is the guaranteed operating temperature range for MAX4281EUK-T?
The MAX4281EUK-T is rated for operation from −40°C to +85°C ambient temperature. All electrical characteristics-including input offset voltage, supply current, and gain-bandwidth product-are specified across this full industrial temperature range, ensuring reliability in automotive cabin modules, industrial controllers, and outdoor portable equipment.
Can the MAX4281EUK-T drive a 100pF capacitive load without oscillation?
Yes. The MAX4281EUK-T is characterized for stability with capacitive loads up to 470pF without external isolation resistors. A 100pF load falls well within this specification, and typical small-signal pulse response shows minimal overshoot and no sustained ringing. Layout best practices (short traces, local 0.1µF bypass) further ensure robustness.
Is the MAX4281EUK-T pin-compatible with other SOT23-5 op amps?
The MAX4281EUK-T uses standard SOT23-5 pinout (IN−, IN+, OUT, VEE, VCC), matching industry conventions for single op amps. However, functional compatibility depends on internal architecture: it is unity-gain-stable and rail-to-rail output, unlike many legacy SOT23-5 op amps that require minimum gain or have limited output swing. Always verify loop stability and DC specs before drop-in replacement.
MAX4281EUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- GainAmp™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-T FAQ
1.How can I place an order for MAX4281EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4281EUK-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 MAX4281EUK-T reliable?
The price and inventory of MAX4281EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4281EUK-T is usually 5 days.
3.What payment methods are accepted for MAX4281EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4281EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4281EUK-T?
MAX4281EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4281EUK-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 MAX4281EUK-T?
For technical support, including MAX4281EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4281EUK-T requirements.
6.How does Aetrix verify that MAX4281EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX4281EUK-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 MAX4281EUK-T meets industry standards.
7.What is the process for return or replacement of MAX4281EUK-T?
All MAX4281EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4281EUK-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 MAX4281EUK-T part is unused and in its original packaging.
Return procedure for MAX4281EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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