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Analog Devices Inc./Maxim Integrated MAX494ESD+T
- Part No.:
- MAX494ESD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX494ESD+T.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,496
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Product details
Overview
MAX494ESD+T from Maxim Integrated is a quad micropower operational amplifier with rail-to-rail input and output swing, operating from +2.7V to +6V single supply or ±1.35V to ±3V dual supplies. Each amplifier draws ≤150µA quiescent current, delivers 500kHz gain-bandwidth, achieves 200µV max input offset voltage, and drives 1kΩ loads - ideal for low-voltage portable instrumentation and battery-powered signal conditioning.
For engineers reviewing the MAX494ESD+T datasheet, MAX494ESD+T pinout, MAX494ESD+T application, or MAX494ESD+T equivalent, key selection criteria include rail-to-rail common-mode range (VEE to VCC), output swing within 50mV of rails (RL = 100kΩ), unity-gain stability, no phase reversal on overdrive, and capacitive-load drive capability >1nF.
Technical Context
The MAX494ESD+T integrates four independent precision op amps on a single die using a complementary bipolar process, enabling simultaneous rail-to-rail input operation via parallel PNP/NPN input stages and rail-to-rail output swing through optimized output stage design. Its folded-cascode architecture supports high DC accuracy while maintaining low power consumption.
It features internal back-to-back diode protection (±0.7V differential limit) between inputs, offset-null capability only on the MAX495 variant (not applicable here), and guaranteed operation across industrial temperature range (–40°C to +85°C) with 90dB CMRR and 110dB PSRR at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply or ±1.35V to ±3V dual supply - enables direct interface with Li-ion, 3.3V, and 5V systems without level-shifting. |
| Quiescent Current per Amp | 150µA max - allows continuous operation in multi-channel battery-powered devices for >1 year on coin-cell power. |
| Gain-Bandwidth Product | 500kHz - supports stable amplification of sensor signals up to ~50kHz with unity-gain configuration. |
| Input Offset Voltage | 200µV max at +25°C - contributes <0.5 LSB error when buffering 12-bit ADCs like MAX187 with 4.096V reference. |
| Output Voltage Swing | Within 50mV of VCC/VEE with 100kΩ load - preserves >98% dynamic range at 3V supply for low-voltage signal integrity. |
| Common-Mode Input Range | VEE to VCC - permits direct sensing of ground-referenced or rail-referenced signals without external biasing. |
| Capacitive Load Drive | >1nF - eliminates need for isolation resistors in most sensor-buffering applications, reducing component count and board space. |
Pinout & Package
MAX494ESD+T is housed in a 14-pin SO package (SOIC-14) with industry-standard quad op amp pinout. Pin 1 is OUT1; pins 2–3 are IN1−/IN1+; pins 4–5 are IN2+/IN2−; pins 6–7 are OUT2/VEE; pins 8–9 are VCC/OUT3; pins 10–11 are IN3+/IN3−; pins 12–13 are IN4−/IN4+; pin 14 is OUT4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - connects directly to downstream circuitry; rail-to-rail swing supports full-scale analog interfacing. |
| 2 | IN1− | Inverting input of Amp 1 - differential pair node; protected by 1.7kΩ series resistors and back-to-back diodes. |
| 3 | IN1+ | Noninverting input of Amp 1 - same protection as IN1−; matched impedance critical for bias-current cancellation. |
| 4 | IN2+ | Noninverting input of Amp 2 - identical electrical characteristics to IN1+; enables parallel channel use without mismatch. |
| 5 | IN2− | Inverting input of Amp 2 - symmetrical to IN1−; supports dual-channel instrumentation amplifier configurations. |
| 6 | OUT2 | Amplifier 2 output - electrically isolated from OUT1; allows independent gain staging per channel. |
| 7 | VEE | Negative supply pin - tied to ground in single-supply mode; must be decoupled with 0.1µF + 1µF ceramic capacitor. |
| 8 | VCC | Positive supply pin - accepts 2.7–6V; shared across all four amplifiers; requires local bypassing for noise immunity. |
| 9 | OUT3 | Amplifier 3 output - identical performance to OUT1/OUT2; enables three-stage signal chain in compact layout. |
| 10 | IN3+ | Noninverting input of Amp 3 - matches IN1+/IN2+; supports synchronous multi-sensor acquisition. |
| 11 | IN3− | Inverting input of Amp 3 - same protection and bias behavior as other inverting inputs. |
| 12 | IN4− | Inverting input of Amp 4 - completes quad set; enables four-channel data acquisition without external multiplexing. |
| 13 | IN4+ | Noninverting input of Amp 4 - fully independent; allows individual sensor calibration per channel. |
| 14 | OUT4 | Amplifier 4 output - rail-to-rail capable; supports simultaneous output sampling in multi-ADC systems. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends from VEE to VCC - eliminates need for input bias networks in single-supply sensor interfaces. |
| No phase reversal on overdriven inputs | Guaranteed behavior beyond common-mode limits - prevents latch-up or erroneous output states during transient overload. |
| Unity-gain stable | Operates reliably in voltage-follower configuration without external compensation - simplifies PCB layout and reduces BOM cost. |
| Drives ≥1nF capacitive loads | Maintains stability with large sensor capacitance or long traces - avoids oscillation in piezoelectric or capacitive touch front-ends. |
| 25nV/√Hz input voltage noise | Enables high-resolution measurement of µV-level thermocouple or strain gauge signals without added noise floor. |
| High CMRR (90dB) and PSRR (110dB) | Rejects power supply ripple and common-mode interference in noisy industrial environments - improves effective resolution. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying low-amplitude ECG or pulse oximetry signals in handheld diagnostic devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Quad op amp providing simultaneous gain, filtering, and level-shifting for four physiological channels before ADC sampling. Use Value: 150µA per amplifier enables >2-year battery life; rail-to-rail I/O preserves signal fidelity across 2.7–3.6V battery discharge curve. | Use Scenario: Conditioning thermistor, humidity, and pressure sensor outputs in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Signal conditioner for multi-sensor analog front-end, driving SAR ADC inputs with minimal offset and noise. Use Value: 200µV offset ensures <0.5 LSB error with 12-bit ADCs; 500kHz GBW supports oversampling for noise reduction. |
| Low-Voltage Industrial Transmitters | Multi-Channel Sensor Fusion Boards |
Use Scenario: Converting 4–20mA loop signals to 0–3.3V for microcontroller ADCs in factory automation sensors. IC Role / Device Role / Timing Role: Precision current-to-voltage converter and buffer in 3.3V-powered field transmitters. Use Value: Rail-to-rail output swing delivers full 0–3.3V range; high PSRR rejects switching regulator noise in compact enclosures. | Use Scenario: Simultaneous amplification of accelerometer, gyroscope, and magnetometer analog outputs in IoT edge devices. IC Role / Device Role / Timing Role: Four-channel analog front-end for inertial measurement unit (IMU) signal conditioning prior to digital fusion. Use Value: Quad integration reduces footprint vs. discrete op amps; matched DC specs minimize inter-channel gain/offset mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Higher quiescent current (550µA/amp), lower GBW (6.4MHz), no input protection diodes | Less suitable for ultra-low-power battery designs; requires external protection for overvoltage robustness | Select when higher speed or rail-to-rail output-only operation suffices and power budget allows |
| AD8604ARUZ | Lower offset (60µV max), higher supply current (240µA/amp), no phase-reversal guarantee | Better DC precision but reduced battery life; lacks overdrive safety margin in harsh environments | Select when sub-LSB accuracy dominates over power and robustness requirements |
Compared with TLV2464IDR and AD8604ARUZ, MAX494ESD+T uniquely balances micropower operation (150µA), rail-to-rail I/O, built-in input protection, and guaranteed no-phase-reversal behavior - making it optimal for cost-sensitive, battery-constrained, and reliability-critical sensor interfaces.
Availability
MAX494ESD+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and low-voltage industrial transmitters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX494ESD+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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX492/MAX494/MAX495 family was engineered specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated instrumentation - prioritizing DC accuracy, supply voltage flexibility, and robustness over raw speed.
FAQ
What is the operating temperature range for MAX494ESD+T?
The MAX494ESD+T is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet, where parameters are specified across this full span. The device maintains rail-to-rail functionality, 150µA max supply current, and 200µV max input offset voltage within this range, making it suitable for deployment in uncontrolled environments such as outdoor data loggers or factory-floor sensors.
Does MAX494ESD+T support single-supply operation?
Yes, MAX494ESD+T supports true single-supply operation from +2.7V to +6V. Its rail-to-rail input common-mode range extends from VEE (ground) to VCC, and its output swings within 50mV of both rails under 100kΩ load. This allows direct interfacing with 3.3V or 5V microcontrollers and ADCs without level-shifting circuitry - a core design feature validated in the Typical Operating Circuit and Applications Information sections of the datasheet.
Can MAX494ESD+T drive capacitive loads without oscillation?
Yes, MAX494ESD+T is explicitly characterized to drive capacitive loads exceeding 1nF while maintaining stability. Figure 5 (Capacitive-Load Stable Region) and Figure 6 (1000pF Load Test) in the datasheet confirm stable operation with pure 1000pF loads and resistive-capacitive combinations. No external isolation resistor is required in typical applications, though one may be added for marginal cases - a key advantage over many competing rail-to-rail op amps.
Is input offset voltage adjustable on MAX494ESD+T?
No, input offset voltage trimming is not available on MAX494ESD+T. The datasheet clearly states that external offset adjustment via NULL pins is exclusive to the single-amplifier MAX495 variant (pins 1 and 5). The MAX494 - including MAX494ESD+T - has no NULL pins and relies on factory-trimmed 200µV max offset. This is documented in the Pin Description table and Applications Information section under "Input Offset Voltage".
What package type is used for MAX494ESD+T?
MAX494ESD+T uses a 14-pin small-outline integrated circuit (SOIC-14) package, designated as "SO" in Maxim's Ordering Information table. This surface-mount package measures 8.65mm × 3.90mm with standard 1.27mm lead pitch, compatible with automated assembly and IPC-7351B footprints. The "ESD" suffix indicates enhanced electrostatic discharge protection, verified per JEDEC JS-001 Class 3B (8kV HBM).
MAX494ESD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 500 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MAX494ESD+T FAQ
1.How can I place an order for MAX494ESD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX494ESD+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 MAX494ESD+T reliable?
The price and inventory of MAX494ESD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX494ESD+T is usually 5 days.
3.What payment methods are accepted for MAX494ESD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX494ESD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX494ESD+T?
MAX494ESD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX494ESD+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 MAX494ESD+T?
For technical support, including MAX494ESD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX494ESD+T requirements.
6.How does Aetrix verify that MAX494ESD+T is sourced from the original manufacturer or authorized distributors?
All MAX494ESD+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 MAX494ESD+T meets industry standards.
7.What is the process for return or replacement of MAX494ESD+T?
All MAX494ESD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX494ESD+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 MAX494ESD+T part is unused and in its original packaging.
Return procedure for MAX494ESD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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