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Analog Devices Inc./Maxim Integrated MAX4490AXK-T
- Part No.:
- MAX4490AXK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX4490AXK-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
MAX4490AXK-T from Maxim Integrated is a single-channel, rail-to-rail input/output CMOS operational amplifier in SC70-5 package, designed for low-voltage (2.7V–5.5V) and low-power applications. It delivers 10MHz gain-bandwidth, 10V/µs slew rate, 50pA input bias current, and drives 2kΩ loads to within 55mV of either supply rail - enabling precision signal conditioning in battery-powered sensor interfaces and portable audio systems.
For engineers reviewing the MAX4490AXK-T datasheet, MAX4490AXK-T pinout, MAX4490AXK-T application, or MAX4490AXK-T equivalent, key selection criteria include capacitive-load stability up to 300pF, automotive-grade temperature range (−40°C to +125°C), ultra-small SC70 footprint, rail-to-rail I/O performance at sub-1mA supply current, and unity-gain stability without external compensation.
Technical Context
The MAX4490AXK-T employs parallel N- and P-channel differential input stages to achieve rail-to-rail common-mode input range (VSS to VDD), with seamless handoff between input pairs across the full supply range. Its class-AB push-pull output stage provides symmetrical sourcing/sinking capability and maintains <1.5mV output swing error into 100kΩ at room temperature.
It achieves unity-gain stability with capacitive loads ≤300pF due to internal compensation optimized for high-speed operation, while its 5pF input capacitance requires careful gain-setting resistor selection (<3kΩ recommended) to avoid phase-margin degradation in high-frequency closed-loop configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V single supply - supports direct interfacing with Li-ion, Li-Po, and 3.3V logic rails without level shifting. |
| Gain-Bandwidth Product | 10MHz - enables stable closed-loop gain ≥10 at 1MHz or ≥100 at 100kHz for sensor amplification and active filtering. |
| Slew Rate | 10V/µs - ensures faithful reproduction of fast transient signals (e.g., pulse-width modulated control loops or audio peaks) without distortion. |
| Input Bias Current | ±50pA typical - minimizes voltage error in high-impedance sensor bridges (e.g., thermistors, photodiodes) and precision reference buffers. |
| Output Swing (RL = 2kΩ) | Within 55mV of VDD/VSS - preserves dynamic range in low-voltage ADC front-ends and analog comparators operating near supply rails. |
| Capacitive Load Drive | Stable with ≤300pF - eliminates need for isolation resistors when driving ADC inputs, RF detector diodes, or long PCB traces. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensors, industrial motor controllers, and outdoor IoT edge nodes. |
Pinout & Package
MAX4490AXK-T is housed in an ultra-small 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), 50% smaller than standard SOT23-5 - optimized for space-constrained portable and wearable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting Input | High-impedance CMOS node accepting rail-to-rail common-mode voltages; connects to sensor outputs or reference dividers. |
| 2 VSS | Negative Supply Input | Ground reference for single-supply operation; substrate tie point - must be low-impedance connection to minimize noise coupling. |
| 3 IN− | Inverting Input | Differential input node for feedback networks; sensitive to stray capacitance - layout requires guard ring and short trace routing. |
| 4 OUT | Amplifier Output | Class-AB push-pull driver capable of ±50mA short-circuit current; directly interfaces with ADC inputs, transimpedance stages, or LED drivers. |
| 5 VDD | Positive Supply Input | Primary power pin - requires local 0.1µF ceramic decoupling placed ≤2mm from pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Input/Output | Enables full-scale signal utilization in 2.7V–5.5V systems - critical for maximizing SNR in low-voltage data acquisition chains. |
| 10V/µs Slew Rate | Supports >1MHz small-signal bandwidth in unity-gain buffer configurations - suitable for fast-settling instrumentation and real-time control loops. |
| 300pF Capacitive-Load Stability | Eliminates need for output series resistors when driving sampling capacitors (e.g., SAR ADCs) or RF envelope detectors - reduces BOM count and board area. |
| 50pA Input Bias Current | Reduces offset drift in high-Z transducer interfaces (e.g., pH electrodes, piezoelectric sensors) - avoids mandatory external guarding or T-network compensation. |
| SC70-5 Package | Enables <2.5mm² total footprint - ideal for hearing aids, medical patches, and compact battery management modules where PCB real estate is premium. |
Applications
| Battery-Powered Sensor Amplifiers | Portable Audio Signal Conditioning |
|---|---|
Use Scenario: Amplifying microvolt-level output from MEMS accelerometers or thermopile IR sensors in wireless sensor nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input to capture full sensor dynamic range and rail-to-rail output to maximize ADC utilization. Use Value: Sub-1mA quiescent current extends battery life beyond 2 years; 50pA input bias prevents loading errors in high-impedance sensor elements. |
Use Scenario: Buffering and level-shifting line-out signals from Bluetooth audio SoCs to headphone drivers or analog codec inputs in true-wireless earbuds. IC Role / Device Role / Timing Role: Unity-gain rail-to-rail buffer isolating source impedance and preserving signal integrity across variable load conditions. Use Value: 10V/µs slew rate prevents clipping on 20kHz audio transients; 300pF capacitive drive capability supports direct connection to ESD protection diodes and long flex traces. |
| High-Side Current Sensing | RF Power Amplifier Control |
Use Scenario: Measuring bidirectional motor phase current via shunt resistor in 3.3V-powered BLDC controller ICs used in drones and power tools. IC Role / Device Role / Timing Role: Difference amplifier front-end with rail-to-rail input accepting common-mode voltages up to VDD, rejecting PWM noise via high CMRR. Use Value: 110dB large-signal voltage gain ensures accurate current resolution down to 10mΩ shunts; −40°C to +125°C rating matches motor thermal profile. |
Use Scenario: Converting RF power detector diode output (e.g., MAX2016) into precise DC control voltage for GaN PA bias adjustment in 5G small-cell base stations. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier conditioning logarithmic detector output with minimal added offset or drift. Use Value: 12nV/√Hz voltage-noise density preserves detector SNR; 10MHz GBW supports fast AGC loop response times <100ns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSV911ICT | Single 5V op amp in SC70-5; 8MHz GBW, 8.5V/µs slew rate, 100pA IB, −40°C to +125°C rated. | Lower bandwidth and slew rate limit use in >500kHz closed-loop filters or fast-settling data acquisition. | Preferred where cost sensitivity outweighs speed requirements and 55mV output swing margin is acceptable. |
| MCP6001T-E/OT | Single 5.5V op amp in SOT23-5; 1MHz GBW, 0.6V/µs slew rate, 100pA IB, −40°C to +125°C rated. | Insufficient bandwidth for audio or RF control loops; requires larger SOT23-5 footprint vs. SC70-5. | Selected for ultra-low-cost, low-speed sensor buffering where space and speed are secondary to BOM reduction. |
Compared with TSV911ICT and MCP6001T-E/OT, the MAX4490AXK-T provides 2.5× higher gain-bandwidth and 12× faster slew rate in the smallest SC70-5 package - making it uniquely suited for space-constrained, high-dynamic-range applications demanding both precision and speed across automotive and industrial temperature ranges.
Availability
MAX4490AXK-T is available at Aetrix Electronics and suitable for battery-powered instruments, portable equipment, and automotive sensor modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4490AXK-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX4490AXK-T belongs to Maxim's rail-to-rail I/O op amp family engineered for low-voltage, low-power signal conditioning in space- and energy-constrained systems - emphasizing speed, precision, and robustness over wide temperature and supply ranges.
FAQ
What is the maximum capacitive load the MAX4490AXK-T can drive without external compensation?
The MAX4490AXK-T is unity-gain stable with capacitive loads up to 300pF, as verified in the manufacturer's Typical Operating Characteristics (Figure 4). This allows direct connection to ADC sampling capacitors, RF detector diodes, or long PCB traces without adding isolation resistors - simplifying layout and reducing component count in high-frequency signal paths.
Does the MAX4490AXK-T support dual-supply operation?
Yes, the MAX4490AXK-T operates from dual supplies of ±1.35V to ±2.75V, in addition to single 2.7V–5.5V operation. Its rail-to-rail input common-mode range extends from VSS to VDD, enabling symmetric signal handling in bipolar configurations - useful in audio line drivers and precision instrumentation requiring negative signal swing.
What is the output voltage swing specification for the MAX4490AXK-T into a 2kΩ load?
Into a 2kΩ load, the MAX4490AXK-T delivers output swing within 55mV of both VDD and VSS across the full −40°C to +125°C temperature range. At room temperature and RL = 100kΩ, swing improves to within 1.5mV - ensuring maximum dynamic range utilization in low-voltage ADC front-ends and comparator interfaces.
How does the input bias current of the MAX4490AXK-T affect high-impedance sensor interfaces?
With a typical input bias current of 50pA, the MAX4490AXK-T introduces negligible voltage error in sensor interfaces with source impedances up to 10MΩ - critical for thermistor networks, pH electrodes, and photodiode transimpedance stages. This eliminates the need for external bias-current compensation networks in most precision measurement designs.
Is the MAX4490AXK-T pin-compatible with other members of the MAX449x family?
No - the MAX4490AXK-T is a single-channel device in SC70-5, while MAX4491AUK-T (dual) uses SOT23-8 and MAX4492AUD (quad) uses TSSOP-14. Pinouts differ across channel count and package variants; only the MAX4490AUK-T (SOT23-5) shares identical pin mapping but differs in package dimensions and thermal characteristics.
MAX4490AXK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 800µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX4490AXK-T FAQ
1.How can I place an order for MAX4490AXK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4490AXK-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 MAX4490AXK-T reliable?
The price and inventory of MAX4490AXK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4490AXK-T is usually 5 days.
3.What payment methods are accepted for MAX4490AXK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4490AXK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4490AXK-T?
MAX4490AXK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4490AXK-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 MAX4490AXK-T?
For technical support, including MAX4490AXK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4490AXK-T requirements.
6.How does Aetrix verify that MAX4490AXK-T is sourced from the original manufacturer or authorized distributors?
All MAX4490AXK-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 MAX4490AXK-T meets industry standards.
7.What is the process for return or replacement of MAX4490AXK-T?
All MAX4490AXK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4490AXK-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 MAX4490AXK-T part is unused and in its original packaging.
Return procedure for MAX4490AXK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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