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Analog Devices Inc./Maxim Integrated MAX4245AUT
- Part No.:
- MAX4245AUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4245AUT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
The MAX4245AUT from Maxim Integrated is a single-channel, rail-to-rail input/output operational amplifier with integrated shutdown control, designed for ultra-low-power, single-supply systems. It delivers 1MHz gain-bandwidth, 320µA quiescent current per amplifier, ±0.4mV input offset voltage (typ), and operates from +2.5V to +5.5V - enabling precision signal conditioning in battery-powered sensor interfaces and portable instrumentation.
For engineers reviewing the MAX4245AUT datasheet, MAX4245AUT pinout, MAX4245AUT application, or MAX4245AUT equivalent, key selection criteria include its 50nA shutdown current, 470pF capacitive-load stability, -40°C to +125°C automotive-grade temperature range, SC70/SOT23 package compatibility, and rail-to-rail output swing within 35mV of rails at 2kΩ load.
Technical Context
This op amp employs a composite NPN/PNP input stage enabling true rail-to-rail common-mode input range (VSS − 0.1V to VDD + 0.1V) and eliminates phase inversion during overdrive. Its unity-gain stable architecture supports direct driving of up to 470pF capacitive loads without external compensation.
The shutdown function is controlled by an active-low SHDN pin referenced to VSS, reducing supply current to 50nA (max) while placing the output in high-impedance state. Input bias current is ±10nA (typ), and large-signal voltage gain exceeds 110dB into 2kΩ, supporting high-accuracy DC-coupled amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - enables direct operation from single Li-ion or dual alkaline cells without regulation. |
| Quiescent Current | 320µA (typ) per amplifier - extends battery life in always-on sensor front-ends. |
| Shutdown Current | 50nA (max) - allows microamp-level system sleep modes with fast wake-up (4µs enable time). |
| Gain-Bandwidth Product | 1MHz - supports bandwidth-critical applications like IR receiver baseband filtering and zero-crossing detection. |
| Input Offset Voltage | ±0.4mV (typ) - ensures <0.1% error in 12-bit ADC driver applications at unity gain. |
| Output Swing (2kΩ) | VSS + 30mV to VDD − 35mV (typ) - maximizes dynamic range in low-voltage, single-supply data acquisition. |
| Capacitive Load Drive | Stable up to 470pF - eliminates need for isolation resistors in LCD bias or DAC output buffering. |
Pinout & Package
The MAX4245AUT is housed in a RoHS-compliant 6-pin SOT23 package (package code U6+4), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Inverting input - accepts differential signals; requires matched source impedance to IN+ to minimize bias-current-induced offset. |
| 2 | VSS | Ground or negative supply - serves as reference for shutdown logic and output swing; must be low-impedance. |
| 3 | IN+ | Noninverting input - supports rail-to-rail common-mode range (VSS − 0.1V to VDD + 0.1V); protected by 5.3kΩ series resistors. |
| 4 | OUT | Amplifier output - delivers rail-to-rail voltage swing; enters high-Z state during shutdown. |
| 5 | SHDN | Active-low shutdown control - referenced to VSS; must not float; logic low (≤0.3×VDD) disables amplifier. |
| 6 | VDD | Positive supply - powers amplifier core and input stage; bypass with 100nF capacitor to VSS for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of supply voltage headroom in 2.5V–5.5V systems, critical for maximizing SNR in low-voltage ADC drivers. |
| 50nA shutdown current | Reduces system standby power to nanoamp levels, supporting >10-year battery life in IoT endpoint sensors. |
| Unity-gain stability @ 470pF | Eliminates external compensation components when driving capacitive loads such as piezoelectric transducers or long cables. |
| No phase inversion on overdrive | Prevents signal corruption in comparator-like zero-crossing detector configurations without external clamping diodes. |
| Automotive temperature range | Guaranteed operation from -40°C to +125°C supports under-hood and infotainment module deployment. |
Applications
| Portable Sensor Interfaces | Single-Supply Zero-Crossing Detectors |
|---|---|
Use Scenario: Amplifying low-amplitude thermistor or MEMS accelerometer outputs in wearable health monitors. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail output swing to maximize ADC input range. Use Value: 320µA quiescent current and 1MHz GBW enable real-time analog preprocessing without compromising battery runtime. | Use Scenario: Detecting AC zero crossings in battery-powered smart meter current sensing circuits. IC Role / Device Role / Timing Role: High-speed comparator replacement with hysteresis-capable op amp configuration. Use Value: No phase inversion on overdrive ensures clean, glitch-free transitions even with noisy input waveforms. |
| Electronic Ignition Modules | Infrared Receiver Front-Ends |
Use Scenario: Conditioning coil current feedback signals in automotive ignition control units. IC Role / Device Role / Timing Role: Robust signal conditioner operating across -40°C to +125°C with high PSRR (90dB typ). Use Value: 90dB PSRR rejects battery ripple and alternator noise, ensuring accurate current measurement during engine cranking. | Use Scenario: Amplifying weak 38kHz modulated IR photodiode signals in remote-control receivers. IC Role / Device Role / Timing Role: Low-noise, high-GBW transimpedance amplifier with THD <0.01% at 10kHz. Use Value: 52nV/√Hz input voltage noise and 1MHz bandwidth preserve signal fidelity for reliable pulse decoding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX44260AUT+ | Lower 1.2µA quiescent current but no shutdown; 350kHz GBW; only 1.8V–5.5V supply. | Suitable for always-on ultra-low-power apps where shutdown is unnecessary and bandwidth <350kHz suffices. | Select MAX44260AUT+ when minimizing average current dominates over peak performance and shutdown is unused. |
| MCP6001T-E/OT | Higher 100µA quiescent current; no shutdown; 1MHz GBW; 1.8V–6.0V supply; wider offset (±1.5mV max). | Better for cost-sensitive industrial controls where extended voltage range and AEC-Q200 qualification matter more than nanoamp shutdown. | Choose MCP6001T-E/OT for legacy designs requiring broad supply compatibility and automotive qualification without shutdown need. |
Compared with MAX4245AUT, MAX44260AUT+ trades shutdown capability and bandwidth for lower quiescent current, while MCP6001T-E/OT sacrifices shutdown and precision for broader supply range and qualification - making MAX4245AUT optimal for automotive-grade, shutdown-enabled, 1MHz-signal-path applications.
Availability
MAX4245AUT is available at Aetrix Electronics and suitable for portable communications, electronic ignition modules, infrared receivers, and sensor-signal detection requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX4245AUT 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 markets.
The MAX4245AUT belongs to Maxim's ultra-low-power, rail-to-rail op amp family engineered for precision signal conditioning in harsh-environment, battery-operated systems - emphasizing shutdown efficiency, wide temperature operation, and capacitive-load robustness.
FAQ
What is the maximum capacitive load the MAX4245AUT can drive without oscillation?
The MAX4245AUT is unity-gain stable driving capacitive loads up to 470pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure 15). This specification applies across the full -40°C to +125°C temperature range and eliminates the need for external isolation resistors in applications like DAC output buffering or LCD bias generation. Exceeding 470pF may require adding an isolation resistor (e.g., 100Ω) between the MAX4245AUT output and the load, though this introduces gain error due to voltage division with the load resistance.
Does the MAX4245AUT support dual-supply operation?
Yes, the MAX4245AUT supports dual-supply operation from ±1.25V to ±2.75V, as explicitly stated in the Applications Information section. Its rail-to-rail input and output stages function correctly with split supplies, and the shutdown pin (SHDN) must be referenced to VSS (not ground) in dual-supply configurations to ensure proper disable functionality. Power-supply rejection ratio remains 90dB (typ), maintaining performance against supply noise in both single- and dual-supply modes.
What is the typical input offset voltage drift over temperature for the MAX4245AUT?
The MAX4245AUT exhibits a typical input offset voltage drift of ±2µV/°C over the full -40°C to +125°C operating range, as specified in the Electrical Characteristics table under "Input Offset Voltage Drift". This low drift ensures minimal calibration drift in precision DC-coupled applications such as strain gauge amplifiers or thermocouple signal chains, where long-term accuracy is critical. The drift value is measured under conditions where VSS ≤ VCM ≤ VDD and is guaranteed by design per Note 4.
Can the MAX4245AUT be used in a single-supply zero-crossing detector circuit?
Yes, the MAX4245AUT is specifically recommended for single-supply zero-crossing detectors, as listed in the Applications section. Its rail-to-rail input stage accepts common-mode voltages down to VSS − 0.1V, and its lack of phase inversion during overdrive prevents false triggering when input signals exceed the supply rails. When configured with hysteresis using positive feedback, the MAX4245AUT delivers clean, jitter-free zero-crossing pulses essential for energy metering and motor control timing.
What is the logic threshold for the SHDN pin on the MAX4245AUT?
The SHDN pin on the MAX4245AUT has a logic threshold referenced to VSS: a logic low is defined as ≤0.3 × VDD, and a logic high is ≥0.7 × VDD, per the Electrical Characteristics table. This rail-referenced threshold ensures reliable shutdown activation across the full +2.5V to +5.5V supply range. Leaving SHDN floating is prohibited - it must be actively driven to VSS (for shutdown) or VDD (for operation) to avoid indeterminate states that could cause erratic output behavior or increased current draw.
MAX4245AUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 375µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX4245AUT FAQ
1.How can I place an order for MAX4245AUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4245AUT 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 MAX4245AUT reliable?
The price and inventory of MAX4245AUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4245AUT is usually 5 days.
3.What payment methods are accepted for MAX4245AUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4245AUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4245AUT?
MAX4245AUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4245AUT 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 MAX4245AUT?
For technical support, including MAX4245AUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4245AUT requirements.
6.How does Aetrix verify that MAX4245AUT is sourced from the original manufacturer or authorized distributors?
All MAX4245AUT 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 MAX4245AUT meets industry standards.
7.What is the process for return or replacement of MAX4245AUT?
All MAX4245AUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX4245AUT, 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 MAX4245AUT part is unused and in its original packaging.
Return procedure for MAX4245AUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4245AUT Tags
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