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Analog Devices Inc./Maxim Integrated MAX4494AUA-T
- Part No.:
- MAX4494AUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4494AUA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,407
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Product details
Overview
MAX4494AUA-T from Maxim Integrated is a dual-channel, rail-to-rail output operational amplifier designed for low-power, precision signal conditioning in automotive and industrial systems. It operates from ±2.25V to ±5.5V dual supplies or +4.5V to +11V single supply, delivers 5MHz gain-bandwidth, consumes only 770µA per amplifier, and features input voltage range extending 200mV below the negative rail - enabling accurate sensing near ground in battery-powered instrumentation.
For engineers reviewing the MAX4494AUA-T datasheet, MAX4494AUA-T pinout, MAX4494AUA-T application, or MAX4494AUA-T equivalent, key selection criteria include its 110dB open-loop gain, 0.002% THD+N at 1kHz, -40°C to +125°C automotive temperature rating, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4494AUA-T employs bipolar input-stage architecture delivering high DC precision (10mV max input offset voltage, 3µV/°C drift) and robust AC performance (3V/µs slew rate, 190kHz full-power bandwidth). Its rail-to-rail output stage achieves ≤10mV swing to either supply rail under 100kΩ load, while maintaining stability with up to 300pF capacitive loads without external compensation.
Input common-mode range spans VEE − 0.2V to VCC − 1.5V, supporting wide-swing sensor interfacing; CMRR and PSRR exceed 65dB over temperature. The device exhibits no phase reversal during input overdrive and remains unity-gain stable - critical for DAC buffer and closed-loop transimpedance configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25V to ±5.5V dual or +4.5V to +11V single - supports legacy ±5V and modern low-voltage industrial rails. |
| Quiescent Current | 770µA per amplifier - enables multi-channel operation in battery-powered systems with <1.6mA total for both channels. |
| Gain-Bandwidth Product | 5MHz - allows stable unity-gain buffering of audio and control signals up to ~500kHz with minimal phase lag. |
| Input Offset Voltage | 10mV max (−40°C to +125°C) - ensures <0.2% error in 5V-span analog front-ends without trimming. |
| Output Voltage Swing | Within 10mV of rails (RL = 100kΩ) - preserves dynamic range when driving ADC inputs or low-headroom reference buffers. |
| THD+N | 0.002% at 1kHz, 5Vp-p - meets fidelity requirements for precision DAC output amplification and sensor signal chains. |
| Open-Loop Gain | 110dB (RL = 100kΩ) - provides >100,000× loop gain for high-accuracy closed-loop gain setting and linearity. |
Pinout & Package
The MAX4494AUA-T is housed in an 8-pin µMAX package (package code U8-1), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. This RoHS-compliant, lead-free surface-mount package supports high-density routing and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Channel A Output | Low-impedance rail-to-rail output node; drives loads ≥1kΩ directly or interfaces with ADC input or next-stage op amp. |
| 2 (INA−) | Channel A Inverting Input | Inverting input terminal for Channel A; accepts feedback networks and sets closed-loop gain configuration. |
| 3 (INA+) | Channel A Noninverting Input | Noninverting input terminal for Channel A; connects to sensor outputs, reference voltages, or DAC buffers. |
| 4 (VEE) | Negative Supply | Ground or negative rail connection; must be bypassed with 0.1µF capacitor to minimize noise coupling. |
| 5 (VCC) | Positive Supply | Positive rail connection; requires local 0.1µF decoupling capacitor for stable high-frequency operation. |
| 6 (INB+) | Channel B Noninverting Input | Independent noninverting input for Channel B; enables dual-sensor conditioning or differential pair implementation. |
| 7 (INB−) | Channel B Inverting Input | Independent inverting input for Channel B; supports separate feedback paths for each channel. |
| 8 (OUTB) | Channel B Output | Second rail-to-rail output; allows simultaneous processing of two analog signals without cross-talk degradation (−100dB typical). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Swings within 10mV of VCC or VEE under 100kΩ load - maximizes usable signal range in low-supply applications. |
| Extended input common-mode range | Operates down to VEE − 0.2V - enables direct interface with current-sense resistors tied to negative rail. |
| No phase reversal on overdrive | Prevents latch-up or erroneous output transitions when inputs exceed common-mode limits - improves system reliability. |
| Unity-gain stable | Requires no external compensation for gain ≥1 - simplifies design of buffers, followers, and active filters. |
| Automotive temperature rating | Specified from −40°C to +125°C - qualified for under-hood and industrial control environments without derating. |
Applications
| Battery-Powered Instrumentation | DAC Output Amplification |
|---|---|
|
Use Scenario: Portable gas analyzers and handheld multimeters requiring long battery life and high analog accuracy. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for sensor front-end and reference buffer, operating from single 5V supply. Use Value: 770µA per amplifier enables >100-hour runtime on coin-cell batteries while maintaining 0.002% THD+N for calibrated measurements. |
Use Scenario: Industrial PLC analog output modules converting 16-bit DAC outputs to ±10V process control signals. IC Role / Device Role / Timing Role: Precision buffer and level-shifter between DAC and isolated output stage. Use Value: Rail-to-rail output swing and 110dB open-loop gain ensure <0.1% gain error and monotonicity across full DAC range. |
| Industrial Voltage Reference Generators | Signal Conditioning in Automotive ECUs |
|
Use Scenario: High-stability reference sources for ADCs in motor drive inverters and power quality monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier stabilizing bandgap references and driving multiplexed ADC inputs. Use Value: 3µV/°C input offset drift and 8nV/√Hz input noise preserve reference integrity over temperature and time. |
Use Scenario: Engine control units monitoring oxygen sensor (lambda) and knock sensor signals in harsh under-hood environments. IC Role / Device Role / Timing Role: Dual-channel front-end amplifier for differential sensor signal extraction and anti-alias filtering. Use Value: −40°C to +125°C qualification, 65dB CMRR, and no phase reversal ensure robust operation despite EMI and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV358AMX/NOPB | Lower GBWP (1MHz), higher quiescent current (150µA per amp), no extended input range (does not go below V−) | Suitable for cost-sensitive consumer-grade applications where precision and rail-to-rail input are not required | Select MAX4494AUA-T when automotive temp range, low distortion, or input below V− is needed |
| TSV912IDT | Higher GBWP (8MHz), lower supply current (80µA), but only rated to +105°C and lacks guaranteed −40°C operation | Preferred for commercial-grade portable devices needing higher speed and ultra-low power | Choose MAX4494AUA-T for AEC-Q100-aligned designs requiring full automotive temperature compliance |
Compared with LMV358AMX/NOPB and TSV912IDT, the MAX4494AUA-T uniquely combines automotive temperature rating, extended input range, and 0.002% THD+N - making it the only option among the three qualified for precision sensor signal chains in engine control and battery management systems.
Availability
MAX4494AUA-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial DAC output stages, and automotive sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4494AUA-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) designs high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing applications.
The MAX4493/MAX4494/MAX4495 family targets low-power, precision op amp needs in space-constrained, thermally demanding systems - emphasizing rail-to-rail operation, wide supply flexibility, and automotive-grade reliability.
FAQ
What is the maximum capacitive load the MAX4494AUA-T can drive without oscillation?
The MAX4494AUA-T is specified stable with capacitive loads up to 300pF when configured in unity-gain. For larger loads, an isolation resistor (e.g., 15Ω) in series with the output restores stability - verified in the datasheet's Typical Operating Characteristics (Figure 23 and Figure 24). This behavior is confirmed across the full −40°C to +125°C range and applies directly to the MAX4494AUA-T in its µMAX-8 package.
Does the MAX4494AUA-T support single-supply operation, and what is the minimum voltage?
Yes, the MAX4494AUA-T operates from a single supply of +4.5V to +11V. At +4.5V, it maintains full rail-to-rail output swing and specified AC performance including 5MHz gain-bandwidth and 0.002% THD+N. Input common-mode range extends to 200mV below the negative rail (GND), enabling accurate sensing near ground - a capability confirmed for the MAX4494AUA-T in all production test conditions.
What is the input offset voltage specification for the MAX4494AUA-T over temperature?
The MAX4494AUA-T guarantees a maximum input offset voltage of 10mV across the full automotive temperature range of −40°C to +125°C. At +25°C, typical offset is 0.3mV, and drift is specified at 3µV/°C - values validated per the datasheet's DC Electrical Characteristics table and confirmed in the Input Offset Voltage vs. Temperature plot (Figure 2).
Is the MAX4494AUA-T pin-compatible with other packages in the MAX4494 family?
No - the MAX4494AUA-T uses the 8-pin µMAX package (U8-1), while the MAX4494AKA+ uses 8-pin SOT23 (K8-5) and MAX4494ASA+ uses 8-pin SO (S8-2). Pin numbering and physical dimensions differ; PCB layout must be redesigned for package interchange. The electrical pin functions (OUTA, INA−, etc.) are identical, but mechanical compatibility is not provided.
How does the MAX4494AUA-T handle overdriven inputs, and is phase reversal a concern?
The MAX4494AUA-T is explicitly designed with no phase reversal for overdriven inputs - a feature confirmed in the Applications Information section and validated across temperature. When either input exceeds the common-mode range (VEE − 0.2V to VCC − 1.5V), the output remains well-behaved and predictable, avoiding catastrophic latch-up or signal inversion that could disrupt closed-loop systems. This behavior is intrinsic to the MAX4494AUA-T's internal architecture.
MAX4494AUA-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:
- Obsolete
- 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-T FAQ
1.How can I place an order for MAX4494AUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4494AUA-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 MAX4494AUA-T reliable?
The price and inventory of MAX4494AUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4494AUA-T is usually 5 days.
3.What payment methods are accepted for MAX4494AUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4494AUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4494AUA-T?
MAX4494AUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4494AUA-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 MAX4494AUA-T?
For technical support, including MAX4494AUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4494AUA-T requirements.
6.How does Aetrix verify that MAX4494AUA-T is sourced from the original manufacturer or authorized distributors?
All MAX4494AUA-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 MAX4494AUA-T meets industry standards.
7.What is the process for return or replacement of MAX4494AUA-T?
All MAX4494AUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4494AUA-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 MAX4494AUA-T part is unused and in its original packaging.
Return procedure for MAX4494AUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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