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Analog Devices Inc./Maxim Integrated MAX4494ASA+T
- Part No.:
- MAX4494ASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4494ASA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,891
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Product details
Overview
MAX4494ASA+T from Maxim Integrated is a dual-channel, rail-to-rail output operational amplifier designed for precision signal conditioning in automotive and industrial systems operating from ±2.25V to ±5.5V dual supplies or +4.5V to +11V single supply. It delivers 5MHz gain-bandwidth, 770µA quiescent current per amplifier, 110dB open-loop gain (RL = 100kΩ), and output swing within 10mV of either rail (RL = 100kΩ), enabling high-fidelity amplification in battery-powered sensor interfaces and DAC output stages.
For engineers reviewing the MAX4494ASA+T datasheet, MAX4494ASA+T pinout, MAX4494ASA+T application, or MAX4494ASA+T equivalent, key selection criteria include its automotive-grade temperature range (–40°C to +125°C), low THD+N (0.002% at 1kHz), input common-mode range extending 200mV below VEE, and SO-8 package compatibility with space-constrained PCB layouts requiring dual op-amp functionality.
Technical Context
The MAX4494ASA+T implements a bipolar-input, rail-to-rail output architecture optimized for stability under capacitive loads up to 300pF without external compensation. Its input stage supports common-mode voltages from VEE – 0.2V to VCC – 1.5V, while the output stage achieves 10mV rail-to-rail swing into 100kΩ and sustains 15mA short-circuit current.
It features unity-gain stability, no phase reversal on overdriven inputs, and maintains 75° phase margin and 15dB gain margin at AV = +1000V/V. The device is fully specified across the automotive temperature range with guaranteed input offset voltage ≤10mV and channel matching ≤1mV for dual-amplifier correlation-critical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25V to ±5.5V dual or +4.5V to +11V single - supports wide-range industrial power rails and battery-backed systems. |
| Quiescent Current | 770µA per amplifier - enables ultra-low-power operation in always-on sensor front-ends and portable instrumentation. |
| Gain-Bandwidth Product | 5MHz - allows stable closed-loop gain ≥10 at 500kHz for anti-aliasing and active filtering. |
| Input Common-Mode Range | VEE – 0.2V to VCC – 1.5V - accommodates ground-referenced inputs and high-side sensing with headroom. |
| Output Voltage Swing | Within 10mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage data acquisition systems. |
| Open-Loop Gain | 110dB (RL = 100kΩ) - ensures <0.001% gain error in precision buffer and reference amplifier configurations. |
| THD+N | 0.002% at 1kHz, 5Vp-p - meets audio-grade and high-resolution ADC driver requirements. |
Pinout & Package
MAX4494ASA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for automotive temperature operation (–40°C to +125°C). The package footprint matches JEDEC MS-012AC standard with 1.27mm pitch and 5.0mm × 6.2mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Channel A Output | Low-impedance rail-to-rail output node for first amplifier channel; requires local 0.1µF bypass to ground. |
| 2 (INA–) | Channel A Inverting Input | Differential input terminal for Channel A; high-impedance node sensitive to PCB layout and stray capacitance. |
| 3 (INA+) | Channel A Noninverting Input | Differential input terminal for Channel A; accepts signals down to VEE – 0.2V for level-shifting applications. |
| 4 (VEE) | Negative Supply | Ground or negative rail connection; must be decoupled independently with 0.1µF capacitor. |
| 5 (VCC) | Positive Supply | Positive rail connection; independent 0.1µF bypass required to minimize PSRR degradation. |
| 6 (INB+) | Channel B Noninverting Input | Differential input for second amplifier; matched to INA+ for dual-channel correlated signal processing. |
| 7 (INB–) | Channel B Inverting Input | Differential input for second amplifier; supports identical bias and common-mode constraints as Channel A. |
| 8 (OUTB) | Channel B Output | Independent rail-to-rail output; enables dual-path signal conditioning without cross-talk (–100dB at 1kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | 10mV from rails into 100kΩ load - preserves full-scale resolution in 12-bit+ SAR and sigma-delta ADC interfaces. |
| Input voltage range extends 200mV below VEE | Enables direct interfacing with transducers and sensors referenced below ground, eliminating level-shift circuitry. |
| No phase reversal on overdriven inputs | Prevents latch-up and system instability during transient overload conditions in motor control feedback loops. |
| Capacitive-load stability up to 300pF | Eliminates need for isolation resistors in most PCB trace and cable-driven applications, simplifying layout. |
| Automotive temperature rating (–40°C to +125°C) | Qualified per AEC-Q100 stress test requirements - suitable for under-hood and chassis-mounted electronics. |
Applications
| Battery-Powered Sensor Interface | DAC Output Amplifier |
|---|---|
|
Use Scenario: Low-power analog front-end for MEMS accelerometers and thermistors in wireless IoT nodes. IC Role / Device Role / Timing Role: Dual-channel signal conditioner: one channel buffers sensor output, the other drives ADC reference or provides gain/offset correction. Use Value: 770µA per amplifier and rail-to-rail output maximize battery life and dynamic range in 3.3V single-supply systems. |
Use Scenario: Precision amplification of 12–16-bit DAC outputs in programmable logic controllers and industrial HMI panels. IC Role / Device Role / Timing Role: Output buffer and level shifter ensuring monotonicity and settling within 4µs to 0.01% for fast update rates. Use Value: 0.002% THD+N and 110dB open-loop gain preserve DAC linearity and reduce harmonic distortion in analog output modules. |
| Industrial Voltage Reference Generator | Signal Conditioning for Automotive Sensors |
|
Use Scenario: Stable, low-drift reference buffer for precision ADCs and analog comparators in process control systems. IC Role / Device Role / Timing Role: Unity-gain follower with matched input offset (≤1mV between channels) stabilizing bandgap references. Use Value: Input offset drift of only 3µV/°C and CMRR ≥90dB ensure reference integrity across –40°C to +125°C ambient. |
Use Scenario: Front-end amplification for crankshaft position, oxygen, and exhaust gas temperature sensors in engine control units. IC Role / Device Role / Timing Role: Dual-channel differential receiver: one channel processes sensor signal, the other rejects common-mode noise on long harnesses. Use Value: PSRR ≥80dB and CMRR ≥90dB suppress ignition noise and alternator ripple; automotive qualification ensures reliability. |
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 |
|---|---|---|---|
| LMV358QDRQ1 | Lower GBWP (1MHz), higher quiescent current (150µA per amp), wider supply range (+2.7V to +5.5V single only) | Limited to low-frequency (<100kHz) applications; not rated for ±5.5V dual supply or >125°C operation | Select when cost sensitivity outweighs bandwidth and dual-supply flexibility; verify thermal derating for under-hood use. |
| TSV912IDT | Higher GBWP (8MHz), lower quiescent current (880µA), but only specified to +105°C and lacks automotive qualification | Suitable for commercial-grade instrumentation but not AEC-Q100-compliant systems | Choose for higher-speed signal chains where extended temperature and automotive qualification are not required. |
Compared with LMV358QDRQ1 and TSV912IDT, MAX4494ASA+T uniquely combines 5MHz bandwidth, ±5.5V dual-supply support, and full automotive temperature qualification - making it the only option among the three qualified for under-hood engine management and battery monitoring systems requiring simultaneous precision, speed, and ruggedness.
Availability
MAX4494ASA+T is available at Aetrix Electronics and suitable for battery-powered sensor interfaces, industrial DAC output stages, and automotive signal conditioning requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MAX4494ASA+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX4493/MAX4494/MAX4495 family targets low-power, rail-to-rail precision amplification in space-constrained systems requiring wide supply range, high open-loop gain, and automotive-grade reliability.
FAQ
What supply voltage ranges does the MAX4494ASA+T support?
The MAX4494ASA+T operates from dual supplies of ±2.25V to ±5.5V or a single supply of +4.5V to +11V. This flexibility allows deployment in both traditional split-rail industrial systems and modern single-rail battery-powered equipment. All electrical specifications, including input common-mode range and output swing, are guaranteed across this full range at temperatures from –40°C to +125°C.
Is the MAX4494ASA+T pin-compatible with other packages in the MAX449x family?
No - the MAX4494ASA+T uses an 8-pin SO package, while the MAX4494AKA+T uses an 8-pin SOT23 and the MAX4494AUA+ uses an 8-pin µMAX. Although all three are dual op-amps with identical pin functions, their footprints, thermal characteristics, and board-level decoupling requirements differ significantly. PCB layout must be tailored to the specific package variant selected.
Does the MAX4494ASA+T require external compensation for stability?
No - the MAX4494ASA+T is unity-gain stable and remains stable driving capacitive loads up to 300pF without external components. Its phase margin is guaranteed at 75° and gain margin at 15dB under standard test conditions (AV = +1000V/V, CL = 15pF). For loads exceeding 300pF, a series isolation resistor (e.g., 15Ω) at the output restores stability without oscillation.
What is the maximum output current capability of the MAX4494ASA+T?
The MAX4494ASA+T provides a continuous output short-circuit current of ±15mA per channel, with rail-to-rail swing maintained into 100kΩ loads. When driving lower impedances such as 1kΩ, output swing degrades to within 200mV of the rails - a design trade-off documented in the datasheet's "Output Voltage Swing vs. Temperature" curves for both RL = 1kΩ and RL = 100kΩ conditions.
How does the MAX4494ASA+T handle overdriven inputs?
The MAX4494ASA+T features no phase reversal on overdriven inputs - a critical reliability feature for systems where input transients may exceed the common-mode range. Unlike many op amps that invert output polarity when inputs saturate, this device maintains correct polarity and recovers predictably, preventing latch-up or false triggering in safety-critical feedback paths like motor current sensing or battery cell monitoring.
MAX4494ASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
MAX4494ASA+T FAQ
1.How can I place an order for MAX4494ASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4494ASA+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 MAX4494ASA+T reliable?
The price and inventory of MAX4494ASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4494ASA+T is usually 5 days.
3.What payment methods are accepted for MAX4494ASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4494ASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4494ASA+T?
MAX4494ASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4494ASA+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 MAX4494ASA+T?
For technical support, including MAX4494ASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4494ASA+T requirements.
6.How does Aetrix verify that MAX4494ASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4494ASA+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 MAX4494ASA+T meets industry standards.
7.What is the process for return or replacement of MAX4494ASA+T?
All MAX4494ASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4494ASA+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 MAX4494ASA+T part is unused and in its original packaging.
Return procedure for MAX4494ASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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