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Analog Devices Inc./Maxim Integrated MAX4471ESA+T
- Part No.:
- MAX4471ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4471ESA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,035
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Product details
Overview
The MAX4471ESA+T from Maxim Integrated is a dual, micropower, rail-to-rail output operational amplifier optimized for ultra-low-power battery systems. It operates from a single +1.8V to +5.5V supply, draws only 750nA per amplifier, features ground-sensing inputs, delivers ±11mA output drive, and achieves 9kHz gain-bandwidth - enabling precision signal conditioning in space-constrained, single-cell Li+ or two-cell alkaline applications.
For engineers reviewing the MAX4471ESA+T datasheet, MAX4471ESA+T pinout, MAX4471ESA+T application, or MAX4471ESA+T equivalent, this page provides verified technical context, package-specific pin mapping, real-world application use cases, and validated alternative options for low-voltage, low-quiescent-current op amp selection.
Technical Context
The MAX4471ESA+T belongs to the unity-gain stable MAX4470/MAX4471/MAX4472 family, with internal compensation ensuring stability at AV = +1V/V. Its BiCMOS process enables ground-sensing input common-mode range (VSS to VDD − 1.1V) and rail-to-rail output swing within 4mV of either rail under 100kΩ load.
It supports capacitive loads up to 250pF without oscillation and exhibits no phase reversal when inputs are overdriven - critical for sensor front-ends and high-impedance source interfacing in portable instrumentation and remote sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - compatible with single Li+ (2.7–4.2V), two-cell NiCd/alkaline (2.4–3.2V), and regulated 3.3V/5V rails. |
| Supply Current (per amp) | 0.75µA typical at +5V - enables >10-year battery life in always-on sensor nodes drawing <1µA system current. |
| Gain-Bandwidth Product | 9kHz - sufficient for DC-coupled thermistor, pH electrode, and electrometer amplification with minimal phase lag. |
| Input Offset Voltage | ±0.5mV typical - ensures sub-10µV error in 100mV full-scale sensor outputs without trimming. |
| Output Drive Capability | ±11mA at +5V - directly drives 470Ω loads (e.g., LED indicators, analog switches) without external buffers. |
| Input Common-Mode Range | VSS to (VDD − 1.1V) - accepts signals down to ground, enabling direct connection to resistive sensors referenced to system GND. |
| Capacitive Load Stability | Stable with ≥250pF - accommodates long PCB traces, EMI filters, or ADC input capacitance without compensation. |
Pinout & Package
MAX4471ESA+T is housed in an 8-pin SO (Small Outline) package with standard SOIC-8 footprint (package code S8+2). Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - rail-to-rail capable; sinks/sources ±11mA; connects directly to ADC input or low-power actuator. |
| 2 | INA− | Inverting input (Channel A) - high-impedance node (±200pA bias); requires guard ring layout for electrometer use. |
| 3 | INA+ | Noninverting input (Channel A) - same CM range as INA−; used for differential or single-ended sensor interfaces. |
| 4 | VSS | Negative supply (GND) - dedicated ground pin; must be low-impedance path to minimize noise coupling into inputs. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor placed ≤2mm from pin to suppress supply ripple. |
| 6 | INB+ | Noninverting input (Channel B) - independent of Channel A; enables dual-sensor monitoring on one IC. |
| 7 | INB− | Inverting input (Channel B) - matched to INA− in offset, bias, and CMRR; supports fully differential configurations. |
| 8 | OUTB | Amplifier B output - identical performance to OUTA; allows independent signal paths without crosstalk (−100dB @ 10kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 4mV of VDD or VSS at 100kΩ load - preserves dynamic range across full supply range, critical for low-voltage ADCs. |
| Ground-sensing input | Common-mode range extends to VSS - eliminates level-shifting for 0–VREF sensor outputs (e.g., thermistors, RTDs). |
| No phase reversal | Guaranteed under input overdrive - prevents latch-up or erroneous output polarity in transient-heavy environments (e.g., ESD events). |
| Unity-gain stability | Internally compensated for AV ≥ +1V/V - simplifies design; no external compensation required for buffer or gain-of-2 configurations. |
| Ultra-low input bias current | ±200pA typical - enables high-Z source interfacing (e.g., glass pH electrodes, piezoelectric sensors) without significant voltage error. |
| High open-loop gain | 120dB typical - ensures <0.001% gain error in closed-loop configurations with feedback resistors ≤10MΩ. |
Applications
| Portable pH Meters | Remote Temperature Sensors |
|---|---|
Use Scenario: Battery-powered handheld pH meter measuring 0–14 pH via glass electrode with high-impedance (>100MΩ) output. IC Role / Device Role / Timing Role: Electrometer-grade front-end amplifier buffering mV-level Nernst potential while rejecting common-mode noise. Use Value: 200pA input bias current minimizes electrode polarization error; rail-to-rail output maximizes ADC utilization of 0–3.3V reference. |
Use Scenario: Wireless soil moisture node using thermistor-based temperature compensation, operating 5 years on CR2032 coin cell. IC Role / Device Role / Timing Role: Precision voltage follower and gain stage for ratiometric thermistor bridge readout. Use Value: 750nA quiescent current extends battery life; ground-sensing input enables direct connection to GND-referenced bridge. |
| Low-Power Gas Detectors | Wearable Biopotential Monitors |
Use Scenario: Portable CO detector with electrochemical sensor requiring transimpedance amplification and baseline correction. IC Role / Device Role / Timing Role: Low-noise, low-drift TIA stage converting pA-level sensor current to measurable voltage. Use Value: 500µV max input offset ensures stable zero-point calibration; 9kHz GBW supports 1Hz–10Hz gas response filtering. |
Use Scenario: Clinical-grade wearable ECG patch acquiring microvolt-level cardiac signals with motion artifact rejection. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with high CMRR and low power. Use Value: 95dB CMRR at DC rejects power-line interference; dual-channel integration reduces board area vs. discrete solutions. |
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 |
|---|---|---|---|
| MAX4471EKA+T | Same electrical specs; packaged in 8-pin SOT23 (K8+5) instead of SOIC-8 (S8+2). | Better suited for high-density PCBs where SOIC-8 footprint is prohibitive; thermal resistance higher (714mW vs. 471mW). | Select for space-constrained layouts; verify thermal derating in enclosed enclosures above +70°C. |
| TLV2462IDR | Higher 600nA supply current but 2.5MHz GBW; input offset ±2mV; not ground-sensing (VCM = VSS + 0.2V min). | Applicable where bandwidth >10kHz is needed (e.g., active filters), but unsuitable for true ground-referenced sensors. | Choose only if bandwidth is prioritized over ground-sensing and ultra-low IQ; requires level-shifting for VSS-connected sources. |
Compared with MAX4471ESA+T, MAX4471EKA+T offers identical performance in a smaller footprint but reduced power dissipation margin, while TLV2462IDR trades ground-sensing capability and ultra-low IQ for higher speed - making MAX4471ESA+T optimal for precision, battery-limited, ground-referenced sensing.
Availability
MAX4471ESA+T is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor nodes, and battery-powered medical devices requiring stable component supply with long-term lifecycle support.
Supply support for MAX4471ESA+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 MAX4470/MAX4471/MAX4472 family was engineered specifically for ultra-low-power, ground-sensing signal conditioning in battery-operated measurement systems - emphasizing nanopower operation, rail-to-rail performance, and robustness in high-impedance sensor interfaces.
FAQ
What is the maximum capacitive load the MAX4471ESA+T can drive stably?
The MAX4471ESA+T is specified to remain stable with capacitive loads up to 250pF without external compensation. This value is confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure MAX4470–74 toc18). Exceeding 250pF may cause peaking or oscillation; for larger loads, a small series resistor (10–50Ω) at the output or feedback compensation per Figure 1 in the datasheet is recommended. The MAX4471ESA+T maintains stability across its full operating temperature range (−40°C to +85°C).
Does the MAX4471ESA+T support true ground-referenced input signals?
Yes, the MAX4471ESA+T features a ground-sensing input common-mode range extending from VSS (0V) to (VDD − 1.1V), as guaranteed by the CMRR test condition. This allows direct connection of sensors whose output swings from 0V - such as thermistors, RTDs, and pH electrodes - without level-shifting circuitry. The MAX4471ESA+T also guarantees no phase reversal when inputs are overdriven below VSS or above VDD, enhancing reliability in transient-prone environments.
What is the typical supply current of the MAX4471ESA+T at 1.8V supply?
At VDD = +1.8V and TA = +25°C, the MAX4471ESA+T draws 0.6µA per amplifier (600nA) typical, as shown in Figure MAX4470–74 toc01. This ultra-low quiescent current enables multi-year operation from primary batteries like CR2032 or AA cells in always-on sensor applications. At full temperature range (−40°C to +85°C), supply current remains ≤1.5µA per amplifier, ensuring predictable battery lifetime across environmental conditions.
Can the MAX4471ESA+T be used in unity-gain buffer configuration?
Yes, the MAX4471ESA+T is unity-gain stable (AV ≥ +1V/V) as confirmed in the Selector Guide and Applications Information section. It requires no external compensation components in buffer, inverter, or gain-of-two configurations. This stability is achieved through internal compensation and is validated across all specified capacitive loads (≤250pF) and supply voltages (+1.8V to +5.5V). The MAX4471ESA+T's 9kHz gain-bandwidth ensures adequate phase margin (>90°) in unity-gain setups.
What is the output voltage swing specification for the MAX4471ESA+T at 5V supply?
With VDD = +5V and RL = 100kΩ, the MAX4471ESA+T delivers an output swing of VSS + 5mV (low) to VDD − 15mV (high), per the Electrical Characteristics table (VOL = 5mV, VOH = 15mV). Under lighter load (RL = 1MΩ), swing improves to VSS + 0.5mV / VDD − 5mV. This rail-to-rail performance ensures >99% of the 0–5V range is usable for ADC interfacing, maximizing resolution without external level-shifting.
MAX4471ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX4471ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4471ESA+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 MAX4471ESA+T reliable?
The price and inventory of MAX4471ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4471ESA+T is usually 5 days.
3.What payment methods are accepted for MAX4471ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4471ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4471ESA+T?
MAX4471ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4471ESA+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 MAX4471ESA+T?
For technical support, including MAX4471ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4471ESA+T requirements.
6.How does Aetrix verify that MAX4471ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX4471ESA+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 MAX4471ESA+T meets industry standards.
7.What is the process for return or replacement of MAX4471ESA+T?
All MAX4471ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4471ESA+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 MAX4471ESA+T part is unused and in its original packaging.
Return procedure for MAX4471ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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