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Analog Devices Inc./Maxim Integrated MAX4494AKA-T
- Part No.:
- MAX4494AKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
MAX4494AKA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,862
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Product details
Overview
The MAX4494AKA-T from Maxim Integrated is a dual-channel, rail-to-rail output operational amplifier optimized 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 DAC output stages.
For engineers reviewing the MAX4494AKA-T datasheet, MAX4494AKA-T pinout, MAX4494AKA-T application, or MAX4494AKA-T equivalent, this page provides verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for dual-supply rail-to-rail op amp selection in temperature-critical embedded designs.
Technical Context
The MAX4494AKA-T implements a bipolar-input, rail-to-rail output architecture with unity-gain stability and no phase reversal under overdrive. Its input stage supports common-mode voltages from VEE − 0.2V to VCC − 1.5V, while the output swings within 10mV of either rail at RL = 100kΩ and within 200mV at RL = 1kΩ.
It achieves 110dB open-loop gain (RL = 100kΩ), 0.002% THD+N at 1kHz, and maintains stable operation with capacitive loads up to 300pF - confirmed by phase margin ≥75° and gain margin ≥15dB in AC characterization.
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 and automotive power rails. |
| Quiescent Current | 770µA per amplifier - enables multi-channel operation in battery-constrained systems without thermal penalty. |
| Gain-Bandwidth Product | 5MHz - sufficient for anti-aliasing, sensor amplification, and DAC buffering up to ~100kHz closed-loop bandwidth. |
| Input Common-Mode Range | VEE − 0.2V to VCC − 1.5V - allows direct interfacing with sub-rail reference sources and current-sense amplifiers. |
| Output Swing (RL = 100kΩ) | Within 10mV of rails - preserves dynamic range in low-voltage data acquisition and precision analog front-ends. |
| Open-Loop Gain | 110dB (RL = 100kΩ) - ensures <100µV error in high-gain configurations (e.g., 1000× instrumentation stages). |
| THD+N | 0.002% at 1kHz - meets audio-grade and high-fidelity signal chain requirements for sensor excitation and feedback loops. |
Pinout & Package
The MAX4494AKA-T is housed in an 8-pin SOT23 package (package code K8-5), with exposed pad not electrically connected. This compact surface-mount outline measures 2.9mm × 1.6mm × 1.1mm and supports reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Channel A output - drives external load or feedback network; rail-to-rail swing enables full utilization of ADC input range. |
| 2 | INA− | Channel A inverting input - connects to feedback resistor or inverting summing node; high CMRR (≥65dB) rejects supply noise. |
| 3 | INA+ | Channel A noninverting input - accepts sensor, reference, or DAC output; input bias current ≤1µA minimizes offset in high-Z sources. |
| 4 | VEE | Negative supply - must be bypassed with 0.1µF capacitor to ground; supports operation down to −2.25V for bipolar signal handling. |
| 5 | VCC | Positive supply - bypassed independently with 0.1µF capacitor; enables dual-supply symmetry critical for zero-centered AC signals. |
| 6 | INB+ | Channel B noninverting input - independent of Channel A; permits dual-path signal processing without crosstalk (>100dB isolation at 1kHz). |
| 7 | INB− | Channel B inverting input - matched to INA− for consistent gain accuracy across both channels; input offset voltage matching ≤1mV. |
| 8 | OUTB | Channel B output - fully independent output stage; same rail-to-rail performance and settling time (4µs to 0.01%) as OUTA. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Swings within 10mV of rails at high impedance - preserves >99% of available voltage headroom for precision measurement circuits. |
| No phase reversal on overdrive | Prevents latch-up or uncontrolled output behavior when inputs exceed common-mode range - critical for fault-tolerant industrial interfaces. |
| Unity-gain stable | Operates reliably at gain = +1 without external compensation - simplifies design of voltage followers and active filters. |
| Automotive temperature rating | Specified from −40°C to +125°C - qualified for engine control units, ADAS sensors, and under-hood power management. |
| Low THD+N (0.002%) | Minimizes harmonic distortion in audio paths and high-fidelity sensor excitation - avoids spectral contamination in FFT-based diagnostics. |
| Capacitive-load stability | Stable with up to 300pF load - eliminates need for output isolation resistors in most PCB trace and cable-driven applications. |
Applications
| Battery-Powered DAC Output Amplifier | Industrial Current-Sense Signal Conditioning |
|---|---|
Use Scenario: Amplifying 12-bit DAC outputs in portable medical monitors and handheld test equipment powered by Li-ion batteries (3.0V–4.2V). IC Role / Device Role / Timing Role: Dual-channel voltage follower and level-shifter, converting unipolar DAC output to bipolar signal referenced to mid-supply. Use Value: Rail-to-rail output swing maximizes DAC effective resolution; 770µA quiescent current extends battery life beyond 100 hours per charge. |
Use Scenario: Amplifying mV-level shunt voltage in 4–20mA loop transmitters and motor drive current feedback circuits operating at −40°C to +125°C. IC Role / Device Role / Timing Role: Precision noninverting amplifier with gain = 100, rejecting common-mode noise from switching power supplies. Use Value: Input common-mode range extending 200mV below VEE enables direct connection to low-side shunts; 110dB open-loop gain ensures <0.1% gain error. |
| Automotive Voltage Reference Generator | High-Accuracy Sensor Excitation Driver |
Use Scenario: Generating stable, low-noise reference voltages for ABS wheel speed sensors and cabin pressure transducers in vehicles. IC Role / Device Role / Timing Role: Buffered reference follower with low drift (3µV/°C) and high PSRR (≥65dB) rejecting alternator ripple. Use Value: 0.002% THD+N prevents harmonic injection into sensitive analog-to-digital conversion; automotive temp rating ensures reliability across climate zones. |
Use Scenario: Driving constant-current excitation for RTD and strain gauge bridges in weigh scales and structural health monitoring systems. IC Role / Device Role / Timing Role: Low-noise, low-drift transimpedance amplifier with matched input offsets (<1mV) across dual channels. Use Value: Dual-channel architecture enables simultaneous bridge excitation and reference buffering; 8nV/√Hz input noise preserves SNR in µV-level measurements. |
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 |
|---|---|---|---|
| TLV2462IDR | Higher quiescent current (600µA per amp vs. 770µA), lower GBW (6.4MHz), wider input range (rail-to-rail), but only rated to +85°C. | Not qualified for automotive use; unsuitable for extended temperature deployments requiring −40°C to +125°C operation. | Select TLV2462IDR only for commercial-temperature consumer or lab equipment where cost is prioritized over thermal robustness. |
| AD8602ARZ | FEMTOampere input bias current (1pA), lower noise (5.5nV/√Hz), but higher supply current (1.2mA), narrower supply range (±2.7V to ±5.5V), and no guaranteed −40°C start-up. | Preferred for ultra-high-impedance pH or photodiode sensors; less suitable for low-power battery systems or harsh-environment industrial nodes. | Choose AD8602ARZ when femtoampere input leakage dominates system error budget, and thermal qualification is secondary to precision. |
Compared with TLV2462IDR and AD8602ARZ, the MAX4494AKA-T uniquely balances automotive temperature compliance, sub-mA quiescent draw, and 5MHz bandwidth - making it the optimal choice for dual-channel signal conditioning where thermal resilience and power efficiency are co-constrained.
Availability
The MAX4494AKA-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive sensor interfaces, and industrial process control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4494AKA-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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX4493/MAX4494/MAX4495 family was designed specifically for low-power, rail-to-rail signal conditioning in space-constrained, thermally demanding environments - emphasizing supply flexibility, precision DC performance, and robust AC behavior.
FAQ
What is the maximum capacitive load the MAX4494AKA-T can drive without external compensation?
The MAX4494AKA-T is characterized for stable operation with capacitive loads up to 300pF when configured as a unity-gain buffer. This value is confirmed in the Capacitive-Load Stability graph and AC Electrical Characteristics table of the official datasheet. For loads exceeding 300pF, an isolation resistor (e.g., 15Ω) in series with the output restores stability, as demonstrated in Figure 1 of the MAX4494AKA-T datasheet. The MAX4494AKA-T does not require external compensation components for standard PCB traces or short cables.
Does the MAX4494AKA-T support single-supply operation, and what is the minimum recommended supply voltage?
Yes, the MAX4494AKA-T supports true single-supply operation from +4.5V to +11V. The minimum recommended single-supply voltage is +4.5V, which corresponds to ±2.25V dual-supply operation. At this voltage, the device maintains full rail-to-rail output swing, 5MHz gain-bandwidth, and specified input common-mode range (down to 200mV below ground). Operation below +4.5V is not characterized and may result in degraded gain, bandwidth, or output swing - the MAX4494AKA-T must not be operated outside its absolute maximum ratings.
What is the input offset voltage specification for the MAX4494AKA-T over temperature?
The MAX4494AKA-T has a maximum input offset voltage of 10mV over the full automotive temperature range (−40°C to +125°C), with typical values of 1mV at +25°C. Its input offset voltage drift is specified at 3µV/°C, meaning total drift across the full range contributes approximately ±0.5mV - well within the 10mV limit. This performance is validated in the DC Electrical Characteristics table and Input Offset Voltage vs. Temperature plot (MAX4493-02) of the datasheet.
Is the MAX4494AKA-T pin-compatible with other devices in the MAX449x family?
No, the MAX4494AKA-T is not pin-compatible with the single-channel MAX4493 or quad-channel MAX4495. It uses an 8-pin SOT23 package with dedicated dual-channel pinout (pins 1–3 and 6–8 assigned to Channel A and B respectively), whereas MAX4493 uses 5-pin SC70 and MAX4495 uses 14-pin TSSOP/SO. Pin compatibility exists only between MAX4494 variants (e.g., MAX4494AKA-T and MAX4494AUA+) sharing the same 8-pin SOT23 footprint and terminal assignment.
What is the power-up time specification for the MAX4494AKA-T, and how does it affect system initialization?
The MAX4494AKA-T has a typical power-up time of 3µs, defined as the time required for the output to settle within 1V of final value after VCC and VEE reach stable levels. This fast startup enables immediate signal processing upon power application - critical in wake-on-event systems like automotive body controllers or portable data loggers. The parameter is measured under conditions of 1µs supply rise time and is documented in the Power-Up Time plot (MAX4493-25) and AC Electrical Characteristics table of the MAX4494AKA-T datasheet.
MAX4494AKA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- 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:
- SOT-23-8
MAX4494AKA-T FAQ
1.How can I place an order for MAX4494AKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4494AKA-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 MAX4494AKA-T reliable?
The price and inventory of MAX4494AKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4494AKA-T is usually 5 days.
3.What payment methods are accepted for MAX4494AKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4494AKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4494AKA-T?
MAX4494AKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4494AKA-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 MAX4494AKA-T?
For technical support, including MAX4494AKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4494AKA-T requirements.
6.How does Aetrix verify that MAX4494AKA-T is sourced from the original manufacturer or authorized distributors?
All MAX4494AKA-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 MAX4494AKA-T meets industry standards.
7.What is the process for return or replacement of MAX4494AKA-T?
All MAX4494AKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4494AKA-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 MAX4494AKA-T part is unused and in its original packaging.
Return procedure for MAX4494AKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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