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Analog Devices Inc./Maxim Integrated MAX4494AUA+
- Part No.:
- MAX4494AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4494AUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
MAX4494AUA+ from Maxim Integrated is a dual-channel, rail-to-rail output operational amplifier designed for low-power, precision signal conditioning in dual-supply (±2.25V to ±5.5V) or single-supply (+4.5V to +11V) systems. It delivers 5MHz gain-bandwidth, 770µA quiescent current per amplifier, and output swing within 10mV of either rail (RL = 100kΩ), enabling high-fidelity amplification in battery-powered industrial sensors and DAC output stages.
For engineers reviewing the MAX4494AUA+ datasheet, MAX4494AUA+ pinout, MAX4494AUA+ application, or MAX4494AUA+ equivalent, key selection criteria include its automotive-grade temperature range (–40°C to +125°C), 110dB open-loop gain, rail-to-rail input common-mode range (VEE – 0.2V to VCC – 1.5V), and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4494AUA+ employs a bipolar process architecture optimized for low distortion and stable unity-gain operation. Its input stage supports common-mode voltages extending 200mV below the negative rail, while the output stage uses complementary emitter-follower circuitry to achieve rail-to-rail swing with <10mV headroom at high impedance loads.
It features no phase reversal under overdriven input conditions and maintains stability with capacitive loads up to 300pF without external compensation. The device's 3V/µs slew rate and 190kHz full-power bandwidth support moderate-speed signal paths in sensor front-ends and reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25V to ±5.5V dual or +4.5V to +11V single - enables direct interface with 5V/±5V and 3.3V logic-supplied systems |
| Quiescent Current | 770µA per amplifier - allows dual op-amp operation in sub-1.5mA total supply budget for portable designs |
| Gain-Bandwidth Product | 5MHz - supports closed-loop gains up to 100 at 50kHz or unity gain at 5MHz for wideband filtering |
| Input Common-Mode Range | VEE – 0.2V to VCC – 1.5V - accommodates ground-referenced inputs in dual-supply configurations |
| Output Voltage Swing | Within 10mV of rails (RL = 100kΩ) - preserves dynamic range in low-voltage data acquisition chains |
| Open-Loop Gain | 110dB (RL = 100kΩ) - ensures <100µV error in precision gain stages with gain ≤ 1000 |
| THD+N | 0.002% at 1kHz - meets audio-grade and high-resolution measurement requirements |
Pinout & Package
The MAX4494AUA+ is housed in an 8-pin µMAX® package (package code U8-1), measuring 3.0mm × 3.0mm × 1.1mm with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Channel A output - drives external load or feedback network; rail-to-rail capable |
| 2 | INA− | Channel A inverting input - connects to feedback resistor or inverting configuration node |
| 3 | INA+ | Channel A noninverting input - accepts reference, sensor, or signal source with 200mV sub-rail capability |
| 4 | VEE | Negative supply - must be bypassed with 0.1µF capacitor to ground for PSRR optimization |
| 5 | VCC | Positive supply - requires dedicated 0.1µF bypass capacitor; supports ±2.25V to ±5.5V operation |
| 6 | INB+ | Channel B noninverting input - independent of Channel A; enables dual-path signal processing |
| 7 | INB− | Channel B inverting input - used for differential gain, instrumentation, or active filter topologies |
| 8 | OUTB | Channel B output - electrically isolated from OUTA; supports separate load or feedback path |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale output down to 10mV from supply rails at 100kΩ load - maximizes usable voltage range in low-voltage systems |
| No phase reversal on overdrive | Prevents latch-up or uncontrolled output transitions when inputs exceed common-mode limits - improves system robustness in transient-prone environments |
| Unity-gain stable | Operates reliably with gain = 1 without external compensation - simplifies design of buffers, followers, and active filters |
| Automotive temperature range | Rated from –40°C to +125°C - qualified for under-hood, motor control, and industrial PLC applications without derating |
| Low THD+N (0.002%) | Minimizes harmonic artifacts in audio and precision analog signal paths - critical for DAC reconstruction and sensor signal fidelity |
Applications
| Battery-Powered Sensor Front-End | DAC Output Amplifier |
|---|---|
|
Use Scenario: Amplifying low-level thermistor or bridge-sensor outputs in handheld test equipment powered by two AA cells (3V). IC Role / Device Role / Timing Role: Dual-channel signal conditioner - one channel buffers reference voltage, the other amplifies sensor output with gain = 100. Use Value: 770µA per amplifier enables >100-hour battery life; rail-to-rail output preserves 2.9Vpp dynamic range from 3V supply. |
Use Scenario: Driving 12-bit DAC output (e.g., MAX531) into a 10kΩ load in programmable power supply control loop. IC Role / Device Role / Timing Role: Precision output buffer - rejects DAC glitch energy and provides low-impedance drive to feedback network. Use Value: 110dB open-loop gain ensures <0.01% gain error; 0.002% THD+N prevents harmonic distortion in closed-loop regulation. |
| Industrial Voltage Reference Generator | Signal Conditioning for Analog Inputs |
|
Use Scenario: Generating stable ±2.5V reference from bandgap source in PLC analog input module operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Dual-output reference buffer - isolates reference source and drives multiple ADC inputs simultaneously. Use Value: Input common-mode range to VEE – 0.2V allows direct buffering of negative reference; 3µs power-up time synchronizes with system reset. |
Use Scenario: Conditioning 4–20mA loop receiver output before feeding 16-bit SAR ADC in factory automation I/O card. IC Role / Device Role / Timing Role: Low-noise transimpedance and level-shift stage - converts current to voltage and shifts to ADC-compatible range. Use Value: 8nV/√Hz input noise density preserves SNR; 5MHz GBW supports anti-aliasing filter cutoff at 100kHz without phase lag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, rail-to-rail output op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2462IDR | Lower supply current (600µA), lower GBW (6.4MHz), but only rated to +105°C (not automotive) | Limited to commercial/industrial temp range; unsuitable for under-hood or extended-temperature deployments | Select when ambient temperature stays ≤ +105°C and ultra-low power (<1.2mA total) is prioritized over temperature margin |
| AD8602ARMZ | FEMTOampere input bias (1pA), higher precision (VOS = 600µV max), but higher quiescent current (1.2mA) and no sub-rail input | Better for high-impedance sensor interfaces (e.g., pH electrodes); less suitable for low-voltage rail-sensing | Choose for ultra-low input bias-critical applications where supply current and temperature range are secondary |
Compared with TLV2462IDR and AD8602ARMZ, the MAX4494AUA+ uniquely balances automotive temperature rating, rail-to-rail input capability (down to VEE – 0.2V), and sub-1mA quiescent current - making it optimal for dual-supply industrial control nodes requiring guaranteed operation at +125°C.
Availability
MAX4494AUA+ is available at Aetrix Electronics and suitable for battery-powered systems, DAC output amplification, and industrial control systems requiring stable component supply across automotive temperature extremes and long-term production continuity.
Supply support for MAX4494AUA+ 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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX4493/MAX4494/MAX4495 family was engineered as low-power, rail-to-rail output op amps targeting space-constrained, battery-sensitive systems needing precision performance across extended temperature ranges.
FAQ
What supply voltage ranges does the MAX4494AUA+ support?
The MAX4494AUA+ operates from dual supplies of ±2.25V to ±5.5V or a single supply of +4.5V to +11V. This flexibility allows direct integration into legacy ±5V systems and modern low-voltage 3.3V or 5V platforms. The device maintains specified performance across the full range, including rail-to-rail output swing and 110dB open-loop gain at ±2.25V.
Is the MAX4494AUA+ pin-compatible with other packages in the MAX4494 family?
No - the MAX4494AUA+ uses the 8-pin µMAX® package (U8-1), which has different pinout and footprint than the 8-pin SOT23 (K8-5) variant (e.g., MAX4494AKA+T). While both contain identical electrical functionality, the µMAX® package places VEE on Pin 4 and VCC on Pin 5, whereas SOT23 swaps these positions. PCB layout must be verified per package drawing 21-0036.
Does the MAX4494AUA+ require external compensation for unity-gain stability?
No - the MAX4494AUA+ is internally compensated and unity-gain stable. It drives resistive and capacitive loads up to 300pF without oscillation. For loads exceeding 300pF, a series isolation resistor (e.g., 15Ω) between output and load restores stability, as confirmed in the Typical Operating Characteristics (Figure 23–24).
What is the input voltage range specification for the MAX4494AUA+?
The MAX4494AUA+ features a wide input common-mode range from VEE – 0.2V to VCC – 1.5V. This means it accepts signals 200mV below the negative rail - critical for ground-referenced inputs in dual-supply systems - and remains functional up to 1.5V below the positive rail, supporting robust operation near supply limits.
How does the MAX4494AUA+ perform in terms of distortion and noise?
The MAX4494AUA+ achieves 0.002% THD+N at 1kHz and 8nV/√Hz input voltage noise density at the same frequency. These values enable high-fidelity signal paths in DAC reconstruction, audio line drivers, and precision sensor amplification where harmonic content and broadband noise directly impact measurement accuracy and dynamic range.
MAX4494AUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 200 nA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 770µA (x2 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4494AUA+ FAQ
1.How can I place an order for MAX4494AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4494AUA+ 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 MAX4494AUA+ reliable?
The price and inventory of MAX4494AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4494AUA+ is usually 5 days.
3.What payment methods are accepted for MAX4494AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4494AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4494AUA+?
MAX4494AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4494AUA+ 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 MAX4494AUA+?
For technical support, including MAX4494AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4494AUA+ requirements.
6.How does Aetrix verify that MAX4494AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4494AUA+ 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 MAX4494AUA+ meets industry standards.
7.What is the process for return or replacement of MAX4494AUA+?
All MAX4494AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4494AUA+, 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 MAX4494AUA+ part is unused and in its original packaging.
Return procedure for MAX4494AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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