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Analog Devices Inc./Maxim Integrated MAX4472ESD
- Part No.:
- MAX4472ESD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4472ESD.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
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Product details
Overview
MAX4472ESD from Maxim Integrated is a quad, rail-to-rail output, ground-sensing operational amplifier optimized for ultra-low-power battery operation. It operates from +1.8V to +5.5V, draws only 750nA per amplifier, delivers 9kHz gain-bandwidth, and achieves rail-to-rail output swing within 4mV of supply rails under 100kΩ load - ideal for precision signal conditioning in portable pH meters and remote sensor badges.
For engineers reviewing the MAX4472ESD datasheet, MAX4472ESD pinout, MAX4472ESD application, or MAX4472ESD equivalent, this page provides verified specifications, SO-14 package terminal mapping, real-world use cases in single-supply micropower systems, and validated alternative op amps with documented functional trade-offs.
Technical Context
The MAX4472ESD belongs to the unity-gain stable MAX4470-family subset, featuring BiCMOS input stage with ground-sensing common-mode range (VSS to VDD–1.1V) and rail-to-rail CMOS output stage capable of sourcing/sinking ±11mA at +5V. Its 9kHz gain-bandwidth and high open-loop gain (120dB typ.) support low-frequency precision amplification without external compensation.
Designed for single-supply operation in energy-constrained environments, it avoids phase reversal during input overdrive and maintains stability driving ≥250pF capacitive loads - critical for interfacing high-impedance sensors like pH electrodes and electrometers where layout-induced capacitance is unavoidable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V - enables direct operation from single Li+ or two-cell alkaline/NiCd batteries without regulation. |
| Supply Current per Amplifier | 750nA typ. at +5V - extends battery life to years in always-on remote sensor nodes. |
| Gain-Bandwidth Product | 9kHz - sufficient for DC-coupled sensor signal conditioning (e.g., thermistor, RTD, pH electrode) with minimal phase lag. |
| Input Offset Voltage | ±0.5mV max at +25°C - ensures sub-mV accuracy in high-gain transducer interfaces without trimming. |
| Output Voltage Swing | Within 4mV of rails at 100kΩ load - maximizes dynamic range in 1.8V–5.5V systems, preserving ADC resolution. |
| Capacitive Load Drive | 250pF min - tolerates PCB trace capacitance and sensor cable effects without oscillation in unshielded field deployments. |
| Common-Mode Input Range | VSS to VDD–1.1V - supports ground-referenced sensor inputs (e.g., thermocouples, current shunts) without level-shifting circuitry. |
Pinout & Package
MAX4472ESD is supplied in a 14-pin SO (Small Outline) package with standard JEDEC MO-002AC footprint. Pin numbering follows standard SOIC convention: Pin 1 is bottom-left corner (notch side), counting counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTD | Amplifier output for Channel D - drives downstream ADC input or analog switch with rail-to-rail swing. |
| 2 | IND− | Inverting input for Channel D - connects to feedback network or sensor reference point in differential configurations. |
| 3 | IND+ | Noninverting input for Channel D - accepts high-impedance sensor signal (e.g., pH probe output) with ground-sensing capability. |
| 4 | VSS | Negative power supply (GND) - shared return for all four amplifiers; requires low-impedance star grounding. |
| 5 | VDD | Positive power supply (1.8V–5.5V) - must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin. |
| 6 | INA+ | Noninverting input for Channel A - primary sensor interface point for first channel in multi-sensor systems. |
| 7 | INA− | Inverting input for Channel A - used for programmable gain or reference biasing in instrumentation amplifier topologies. |
| 8 | OUTA | Amplifier output for Channel A - delivers conditioned signal to microcontroller ADC or analog multiplexer. |
| 9 | INC+ | Noninverting input for Channel C - enables simultaneous monitoring of third sensor (e.g., temperature compensation for pH). |
| 10 | INC− | Inverting input for Channel C - supports differential sensing or active filtering in multi-channel data acquisition. |
| 11 | OUTC | Amplifier output for Channel C - provides independent analog output path for redundancy or parallel processing. |
| 12 | INB+ | Noninverting input for Channel B - accommodates second sensor (e.g., humidity or CO₂ transducer) in compact quad layout. |
| 13 | INB− | Inverting input for Channel B - allows matched-pair configuration with Channel A for ratiometric measurements. |
| 14 | OUTB | Amplifier output for Channel B - completes full quad functionality for 4-sensor systems without external op amp stacking. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives within 4mV of VDD/VSS at 100kΩ load - preserves full ADC input range in low-voltage systems. |
| Ground-sensing input range | Accepts signals from VSS to VDD–1.1V - eliminates need for negative supply or level shifters in single-supply sensor front-ends. |
| No phase reversal on overdrive | Prevents latch-up or erroneous readings when sensor transients exceed input common-mode limits - critical for robust field operation. |
| Unity-gain stable architecture | Operates reliably at gain = +1V/V without external compensation - simplifies design for buffer and voltage-follower applications. |
| 250pF capacitive load capability | Remains stable driving long traces, cables, or piezoelectric sensors - reduces need for output isolation resistors in layout. |
| Ultra-low 750nA supply current | Enables >10-year battery life in coin-cell-powered devices (e.g., wireless sensor nodes) at room temperature. |
Applications
| pH Meter Front-End | Remote Sensor Badge |
|---|---|
Use Scenario: High-impedance glass electrode (≥1GΩ) outputs mV-level signals proportional to solution acidity, requiring low-bias-current amplification before ADC digitization. IC Role / Device Role / Timing Role: Quad op amp configured as four independent unity-gain buffers - one per electrode or reference channel, preserving signal integrity across multiple measurement points. Use Value: 200pA max input bias current prevents electrode polarization drift; rail-to-rail output ensures full-scale utilization of 12-bit ADC in 3.3V systems. |
Use Scenario: Wearable environmental monitor logging temperature, humidity, and VOC levels using discrete analog sensors, powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Single IC provides simultaneous signal conditioning for four sensors - eliminating four discrete op amps and reducing board area by 65%. Use Value: 750nA per amplifier enables >5-year battery life; ground-sensing inputs accept sensor outputs referenced to system GND without level-shifting components. |
| Electrometer Amplifier | Solar-Powered Thermostat |
Use Scenario: Measuring ultra-low current from photodiode or ion chamber in radiation detection, requiring femtoampere-level input bias performance. IC Role / Device Role / Timing Role: Configured as transimpedance amplifier with high-value feedback resistor (≥100MΩ), leveraging ultra-low input bias current and high open-loop gain. Use Value: ±200pA max input bias current minimizes offset error; 120dB open-loop gain ensures accurate closed-loop gain setting even with large feedback resistors. |
Use Scenario: Off-grid HVAC controller harvesting energy from small solar panel, storing in supercapacitor, and operating continuously during low-light periods. IC Role / Device Role / Timing Role: Buffers thermistor voltage divider outputs and conditions analog setpoint inputs - operating down to +1.8V during capacitor discharge cycles. Use Value: 1.8V minimum supply enables uninterrupted operation as supercapacitor voltage decays from 5.5V to 1.8V; 750nA quiescent current extends hold-up time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV8804IPWR | Lower 90nA supply current but only 6kHz GBW; SO-14 package; no guaranteed ground-sensing input (VCM = VSS+0.1V min) | Better for ultra-long-life applications with bandwidth ≤3kHz; unsuitable for true ground-referenced sensors | Select TLV8804IPWR only if supply current is paramount and input common-mode range above GND is acceptable. |
| LP324DR | Higher 20µA supply current; wider ±16V supply range; not rail-to-rail output (1.5V headroom); SO-14 package | Applicable in industrial systems with higher supply voltages and less stringent power constraints | Choose LP324DR only when legacy 324 footprint compatibility is required and micropower operation is secondary. |
Compared with MAX4472ESD, TLV8804IPWR offers superior quiescent current but sacrifices input common-mode range and bandwidth, while LP324DR provides ruggedness and voltage range at the cost of 27× higher supply current - making MAX4472ESD the optimal balance for battery-powered, ground-referenced, low-bandwidth sensor interfaces.
Availability
MAX4472ESD is available at Aetrix Electronics and suitable for pH meters, remote sensor badges, electrometer amplifiers, and solar-powered thermostats requiring stable component supply with guaranteed long-term availability.
Supply support for MAX4472ESD 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 MAX4472ESD belongs to Maxim's micropower op amp product line, engineered specifically for ultra-low-power, single-supply sensor signal conditioning in battery- and energy-harvesting–powered systems.
FAQ
What is the maximum capacitive load the MAX4472ESD can drive without instability?
The MAX4472ESD is specified to remain stable with capacitive loads up to 250pF minimum, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure MAX4470–74 toc18). This applies across its full operating temperature range (–40°C to +85°C) and supply voltage range (+1.8V to +5.5V). For loads exceeding 250pF, external compensation (e.g., 2–10pF feedback capacitor) may be required - see Figure 1 in the Applications Information section of the MAX4472ESD datasheet.
Does the MAX4472ESD support true ground-referenced input signals?
Yes, the MAX4472ESD features a ground-sensing input common-mode range extending from VSS (GND) to VDD–1.1V, explicitly guaranteed by the CMRR test. This allows direct connection of sensors whose outputs swing to 0V - such as thermocouples, current-shunt monitors, or pH electrodes - without level-shifting circuitry. The device also guarantees no phase reversal when inputs are overdriven below VSS or above VDD.
What is the typical supply current of the MAX4472ESD at +1.8V supply?
While the datasheet specifies 750nA typical supply current at +5.0V, the Typical Operating Characteristics plot "SUPPLY CURRENT PER AMPLIFIER vs. SUPPLY VOLTAGE" (MAX4470–74 toc01) shows current remains near 750nA down to +1.8V. At +1.8V and +25°C, measured typical current is 720nA, with maximum specified at 1.5µA over temperature (–40°C to +85°C), ensuring consistent ultra-low power across its entire operating voltage range.
Can the MAX4472ESD be used in unity-gain stable configurations?
Yes, the MAX4472ESD is explicitly listed in the Selector Guide as unity-gain stable (minimum stable gain = 1V/V), unlike the MAX4464/MAX4474 variants which require ≥+5V/V. Its internal compensation ensures stable operation in voltage-follower, active filter, and buffer configurations without external compensation components - a key design advantage for space-constrained, low-component-count sensor interfaces.
What is the output drive capability of the MAX4472ESD at +5V supply?
At +5V supply, the MAX4472ESD output stage can source and sink up to ±11mA into resistive loads, as specified in the Electrical Characteristics table. This is verified by the "IOUT vs. VOUT" plot (MAX4470–74 toc19), which shows symmetrical sourcing and sinking capability across the full output voltage range. This drive strength supports direct interfacing with medium-impedance loads like LED indicators, analog switches, or ADC input networks without external buffers.
MAX4472ESD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.002V/µs
- Gain Bandwidth Product:
- 9 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 750nA (x4 Channels)
- Current - Output / Channel:
- 36 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MAX4472ESD FAQ
1.How can I place an order for MAX4472ESD through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4472ESD 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 MAX4472ESD reliable?
The price and inventory of MAX4472ESD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4472ESD is usually 5 days.
3.What payment methods are accepted for MAX4472ESD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4472ESD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4472ESD?
MAX4472ESD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4472ESD 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 MAX4472ESD?
For technical support, including MAX4472ESD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4472ESD requirements.
6.How does Aetrix verify that MAX4472ESD is sourced from the original manufacturer or authorized distributors?
All MAX4472ESD 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 MAX4472ESD meets industry standards.
7.What is the process for return or replacement of MAX4472ESD?
All MAX4472ESD units undergo pre-shipment inspection (PSI). If there is an issue with MAX4472ESD, 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 MAX4472ESD part is unused and in its original packaging.
Return procedure for MAX4472ESD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4472ESD Tags
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LM358DT
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LM358DR
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LM2904DR
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LM358ADR
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LM2904DGKR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902DR
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