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Analog Devices Inc./Maxim Integrated MAX4471ESA+
- Part No.:
- MAX4471ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4471ESA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
The MAX4471ESA+ from Maxim Integrated is a dual, micropower, rail-to-rail output operational amplifier with ground-sensing inputs, operating from +1.8V to +5.5V and drawing only 750nA per amplifier. It features 9kHz gain-bandwidth, unity-gain stability, ±5mV input offset voltage (typ), and delivers ±11mA output drive at +5V - ideal for ultra-low-power sensor signal conditioning in single-cell Li+ or two-cell alkaline battery systems.
For engineers reviewing the MAX4471ESA+ datasheet, MAX4471ESA+ pinout, MAX4471ESA+ application, or MAX4471ESA+ equivalent, this page provides verified specifications, SOIC-8 package layout, dual-channel op amp role in precision low-voltage analog front-ends, and validated alternative options for battery-powered instrumentation.
Technical Context
The MAX4471ESA+ belongs to the MAX4470 family of fully compensated, unity-gain stable amplifiers optimized for micropower operation. Its BiCMOS process enables rail-to-rail output swing within 4mV of supply rails under 100kΩ load and supports ground-sensing input common-mode range (VSS to VDD − 1.1V).
It exhibits no phase reversal on overdriven inputs, 120dB open-loop gain, and stable performance driving ≥250pF capacitive loads - making it suitable for high-impedance, low-frequency signal paths where power budget and input dynamic range are critical constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V - enables direct operation from single Li+ or two alkaline/NiCd cells without regulation. |
| Supply Current per Amplifier | 0.75µA (typ) - allows years of operation on coin-cell batteries in always-on sensor nodes. |
| Gain-Bandwidth Product | 9kHz - sufficient for DC–1kHz sensor amplification (e.g., thermistors, pH electrodes) with minimal power penalty. |
| Input Offset Voltage | ±5mV (max at TA = +25°C) - supports accurate DC-coupled measurement in low-gain configurations. |
| Output Drive Capability | ±11mA (at +5V) - drives 10kΩ loads directly without external buffers in portable data acquisition. |
| Input Common-Mode Range | VSS to VDD − 1.1V - accepts signals down to ground, enabling direct interfacing with 0V-referenced sensors. |
| Capacitive Load Drive | 250pF (min) - tolerates PCB trace capacitance and sensor cable capacitance without compensation. |
Pinout & Package
MAX4471ESA+ is housed in an 8-pin SOIC (SO) package with standard industry footprint (JEDEC MS-012). Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - rail-to-rail capable, sinks/sources ±11mA at +5V. |
| 2 | INA− | Inverting input for Channel A - part of high-CMRR differential pair with ground-sensing capability. |
| 3 | INA+ | Noninverting input for Channel A - accepts signals from 0V up to VDD − 1.1V. |
| 4 | VSS | Negative supply (ground) - must be low-impedance return path for both channels. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed near pin for stability. |
| 6 | INB+ | Noninverting input for Channel B - electrically identical to INA+, supports dual independent signal paths. |
| 7 | INB− | Inverting input for Channel B - matched to INA− for consistent CMRR across both amplifiers. |
| 8 | OUTB | Amplifier B output - fully independent channel with same rail-to-rail swing and drive specs as OUTA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 750nA supply current | Enables >10-year battery life in maintenance-free remote sensor nodes powered by CR2032 cells. |
| Rail-to-rail output stage | Delivers full dynamic range utilization - e.g., 0–5V output swing on +5V supply - maximizing ADC resolution. |
| Ground-sensing input range | Accepts 0V-referenced transducer outputs (e.g., bridge sensors, thermocouples with cold-junction compensation) without level-shifting. |
| No phase reversal on overdrive | Prevents latch-up or erroneous output during transient input excursions beyond common-mode limits - critical for robust field deployment. |
| Unity-gain stable design | Eliminates need for external compensation components in buffer, gain-of-1, or low-gain configurations - reduces BOM count and layout area. |
Applications
| Portable pH Meters | Solar-Powered Environmental Sensors |
|---|---|
Use Scenario: Measuring millivolt-level Nernst potential from glass electrode in handheld pH probe with single AAA battery. IC Role / Device Role / Timing Role: Dual-channel signal conditioner: Channel A buffers reference electrode, Channel B amplifies sensing electrode with 100× gain. Use Value: 750nA quiescent current extends battery life to >2 years; rail-to-rail output ensures full 0–14 pH range maps linearly to 0–3.3V ADC input. |
Use Scenario: Low-power soil moisture and temperature node powered by 2.5V solar cell + supercapacitor, transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Dual op amp configures as precision current-to-voltage converter (for resistive soil sensor) and thermistor voltage divider buffer. Use Value: Operation down to +1.8V allows wake-up and measurement during low-light conditions; ground-sensing inputs interface directly with grounded sensor elements. |
| Remote Asset Monitoring Badges | Low-Power Electrometer Circuits |
Use Scenario: Wearable industrial badge detecting vibration, temperature, and tilt using MEMS sensors, logging data every 5 minutes on coin cell. IC Role / Device Role / Timing Role: Dual amplifier stages condition accelerometer output (AC-coupled) and thermistor signal (DC-coupled) before ADC sampling. Use Value: 9kHz GBW supports anti-alias filtering at 1kHz; 250pF capacitive load tolerance accommodates long flex-cable interconnects without instability. |
Use Scenario: High-impedance current measurement (<1nA) in lab-grade ion-selective electrode or radiation detector front-end. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with ultra-low input bias current (±200pA typ) and guarded input layout. Use Value: Input bias current <500pA minimizes measurement error in picoampere-range currents; no phase reversal prevents output saturation during electrode polarization events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV721M5X/NOPB | Higher 1.5MHz GBW but 60µA supply current - 80× higher than MAX4471ESA+. | Requires regulated supply; unsuitable for direct battery operation below +2.7V. | Select when bandwidth >100kHz is required and power budget allows >50µA per channel. |
| TSV622IST | 170nA supply current (lower), but only 160kHz GBW and non-rail-to-rail output (100mV headroom). | Limited output swing restricts dynamic range in low-voltage ADC interfaces. | Select for ultra-low-current applications where output swing >VDD − 100mV is acceptable and bandwidth ≤100kHz suffices. |
Compared with LMV721M5X/NOPB and TSV622IST, the MAX4471ESA+ uniquely balances sub-µA quiescent current, rail-to-rail output, ground-sensing inputs, and 9kHz bandwidth - making it the optimal choice for battery-powered DC/low-frequency sensor interfaces requiring full supply-rail utilization and multi-year operation.
Availability
MAX4471ESA+ is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor nodes, and battery-powered medical devices requiring stable component supply with guaranteed long-term availability.
Supply support for MAX4471ESA+ 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 MAX4471ESA+ belongs to the MAX4470 family - engineered specifically for micropower, ground-sensing, rail-to-rail op amp applications in energy-constrained, single-supply systems.
FAQ
What is the maximum capacitive load the MAX4471ESA+ can drive without oscillation?
The MAX4471ESA+ is specified to remain stable with ≥250pF capacitive load at unity gain. This value is verified across temperature and supply voltage ranges per the datasheet's "Capacitive Load" parameter. For loads exceeding 250pF, external compensation (e.g., 2–10pF feedback capacitor) may be required - as shown in Figure 1 of the MAX4471ESA+ datasheet. The MAX4471ESA+'s internal compensation is optimized for low-frequency stability, not high-speed driving.
Does the MAX4471ESA+ support operation from a +1.8V supply across its full temperature range?
Yes - the MAX4471ESA+ is fully specified from −40°C to +85°C at +1.8V supply. The datasheet's "Electrical Characteristics" table explicitly guarantees operation down to +1.8V across the entire temperature range, including parameters like supply current (1.5µA max), input offset voltage (±15mV max), and output swing. This makes the MAX4471ESA+ suitable for deep-discharge battery scenarios where voltage drops to 1.8V.
Is the MAX4471ESA+ pin-compatible with other dual op amps in SO-8 package?
No - the MAX4471ESA+ uses a proprietary pinout optimized for dual-channel symmetry: pins 1/8 are outputs, 2/7 are inverting inputs, 3/6 are noninverting inputs, and 4/5 are VSS/VDD. It is not pin-compatible with industry-standard dual op amps like LM358 or TLV2372. Layout reuse requires verification against the MAX4471ESA+ SOIC pin map in the datasheet's "Pin Configurations" section.
What is the typical input bias current of the MAX4471ESA+ at room temperature?
The typical input bias current of the MAX4471ESA+ is ±200pA at +25°C, with a maximum of ±1.5nA over temperature (−40°C to +85°C). This ultra-low value is enabled by its BiCMOS process and is critical for high-impedance sensor interfaces - such as pH electrodes or photodiode TIAs - where bias current directly contributes to measurement error. The MAX4471ESA+'s input bias remains stable across its common-mode range.
Can the MAX4471ESA+ be used in a single-supply electret microphone preamplifier?
Yes - the MAX4471ESA+ is well-suited for electret microphone preamps due to its ground-sensing inputs (accepting microphone's 0V-referenced output), rail-to-rail output (maximizing dynamic range into ADC), and ultra-low noise (120nV/√Hz at 10kHz). Its 9kHz GBW supports audio bandwidth up to ~1kHz, appropriate for voice detection or basic audio event triggering. For full 20kHz audio, a higher-GBW op amp would be needed - but the MAX4471ESA+ excels in low-power wake-on-sound applications.
MAX4471ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-SOIC
MAX4471ESA+ FAQ
1.How can I place an order for MAX4471ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4471ESA+ 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 MAX4471ESA+ reliable?
The price and inventory of MAX4471ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4471ESA+ is usually 5 days.
3.What payment methods are accepted for MAX4471ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4471ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4471ESA+?
MAX4471ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4471ESA+ 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 MAX4471ESA+?
For technical support, including MAX4471ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4471ESA+ requirements.
6.How does Aetrix verify that MAX4471ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4471ESA+ 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 MAX4471ESA+ meets industry standards.
7.What is the process for return or replacement of MAX4471ESA+?
All MAX4471ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4471ESA+, 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 MAX4471ESA+ part is unused and in its original packaging.
Return procedure for MAX4471ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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