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Analog Devices Inc./Maxim Integrated MAX4471EKA+T
- Part No.:
- MAX4471EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
MAX4471EKA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:18,646
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Product details
Overview
MAX4471EKA+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 - ideal for precision sensor signal conditioning in portable pH meters and remote environmental sensors.
For engineers reviewing the MAX4471EKA+T datasheet, MAX4471EKA+T pinout, MAX4471EKA+T application, or MAX4471EKA+T equivalent, this page provides verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for low-voltage, low-current analog front-ends.
Technical Context
The MAX4471EKA+T belongs to the unity-gain stable MAX4470/MAX4471/MAX4472 family, with internal compensation enabling stable operation at AV = +1V/V. Its BiCMOS process enables rail-to-rail output swing within 4mV of either rail under 100kΩ load while maintaining 120dB open-loop gain and 75dB large-signal voltage gain across temperature.
It supports ground-sensing input common-mode range (VSS to VDD − 1.1V), exhibits no phase reversal on overdriven inputs, and sustains stability driving ≥250pF capacitive loads - critical for interfacing high-impedance electrodes and piezoresistive elements without external compensation.
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 typical at +5V - extends battery life to years in always-on sensor nodes and remote badges. |
| Gain-Bandwidth Product | 9kHz - sufficient for DC–100Hz biosensor, thermostat, and industrial transducer signal conditioning. |
| Input Offset Voltage | ±0.5mV typical - minimizes baseline error in high-gain electrode amplifiers (e.g., pH meter front-end). |
| Rail-to-Rail Output Swing | Within 4mV of VDD/VSS at 100kΩ load - maximizes dynamic range in low-voltage ADC interfaces. |
| Output Drive Capability | ±11mA at +5V - directly drives LED indicators, small relays, or RC filters without external buffers. |
| Capacitive Load Stability | Stable with ≥250pF - accommodates long PCB traces or EMI-filtering caps without oscillation. |
Pinout & Package
MAX4471EKA+T is housed in an 8-pin SOT23 package (package code K8+5), RoHS-compliant, with exposed pad not electrically connected. Pin numbering follows standard SOT23 orientation (notch-up, pin 1 top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - connects to next-stage filter, ADC input, or feedback network. |
| 2 | INA− | Inverting input for Channel A - used for precision inverting configurations or current sensing. |
| 3 | INA+ | Noninverting input for Channel A - accepts ground-referenced sensor signals (e.g., thermistor divider). |
| 4 | VSS | Negative supply (GND) - must be low-impedance return path; shared with all system grounds. |
| 5 | VDD | Positive supply (+1.8V to +5.5V) - requires local 0.1µF ceramic bypass capacitor. |
| 6 | INB− | Inverting input for Channel B - independent of Channel A; enables dual-sensor monitoring. |
| 7 | INB+ | Noninverting input for Channel B - supports differential measurement of two separate transducers. |
| 8 | OUTB | Amplifier B output - isolated signal path; allows simultaneous processing of temperature and humidity signals. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 750nA supply current | Enables >10-year battery life in coin-cell-powered IoT edge nodes with wake-on-event architecture. |
| Ground-sensing input range | Accepts 0V-referenced signals (e.g., pH electrode, RTD bridge) without level-shifting circuitry. |
| No phase reversal on overdrive | Prevents latch-up or erroneous readings when sensor transients exceed input common-mode limits. |
| 120dB open-loop voltage gain | Supports high-precision closed-loop gains (≥1000V/V) for microvolt-level signal extraction. |
| 9kHz GBW with unity-gain stability | Eliminates need for external compensation components in most sensor interface designs. |
Applications
| Portable pH Meters | Remote Environmental Sensors |
|---|---|
Use Scenario: High-impedance glass electrode signal conditioning in handheld field instruments. IC Role / Device Role / Timing Role: First-stage transimpedance and buffer amplifier for µV-level electrode potential. Use Value: Ground-sensing inputs accept 0V-referenced electrode outputs; rail-to-rail swing preserves full ADC range at 3.3V supply. |
Use Scenario: Multi-parameter soil moisture/temperature node powered by AA batteries. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for resistive humidity and thermistor sensors. Use Value: 750nA quiescent current extends battery life beyond 5 years; dual amps reduce component count and board area. |
| Solar-Powered Remote Badges | Low-Power Thermostats |
Use Scenario: Occupancy and ambient light sensing in maintenance-free building tags. IC Role / Device Role / Timing Role: Signal amplifier for photodiode and PIR sensor outputs in energy-harvesting systems. Use Value: Operates down to +1.8V - compatible with supercapacitor storage; 250pF load stability simplifies EMI filtering. |
Use Scenario: Battery-backed HVAC control panel with analog temperature and setpoint inputs. IC Role / Device Role / Timing Role: Precision buffer for thermistor voltage dividers and potentiometer wiper signals. Use Value: ±0.5mV offset ensures <±0.1°C measurement accuracy; rail-to-rail output avoids clipping near supply rails. |
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 |
|---|---|---|---|
| MAX4472EUD+ | Quad-channel version in 14-pin TSSOP; same 750nA/amp, 9kHz GBW, and rail-to-rail specs. | Used where four independent sensor channels are required (e.g., multi-zone HVAC or quad thermocouple interface). | Select MAX4472EUD+ when board space permits larger package and channel count exceeds two. |
| TLV2462IDR | Higher 650nA/amp (vs. 750nA), 6.4MHz GBW, wider +2.7V to +6V supply range; not ground-sensing. | Suitable for higher-speed, higher-supply applications (e.g., active filters up to 10kHz), but requires level-shifting for 0V inputs. | Choose TLV2462IDR only if bandwidth >9kHz is mandatory and input common-mode includes ground via external biasing. |
Compared with MAX4471EKA+T, MAX4472EUD+ offers greater channel density at the cost of larger footprint and higher total current draw, while TLV2462IDR trades ultra-low power and ground-sensing capability for higher speed and supply flexibility - making MAX4471EKA+T optimal for battery-limited, ground-referenced sensor systems.
Availability
MAX4471EKA+T is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor nodes, and solar-powered environmental monitors requiring stable component supply and long-term lifecycle support.
Supply support for MAX4471EKA+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 MAX4471EKA+T belongs to the MAX4470-family of micropower op amps engineered specifically for ultra-low-power, ground-sensing sensor interfaces in battery-constrained portable and remote systems.
FAQ
What is the operating temperature range for the MAX4471EKA+T?
The MAX4471EKA+T is specified for operation from −40°C to +85°C. This industrial-grade range ensures reliable performance in outdoor environmental sensors, automotive cabin modules, and uncontrolled indoor HVAC systems. All electrical parameters in the datasheet - including supply current, offset voltage, and gain-bandwidth - are guaranteed across this full range.
Does the MAX4471EKA+T require external compensation for unity-gain stability?
No, the MAX4471EKA+T is internally compensated and unity-gain stable. Its 9kHz gain-bandwidth product and phase margin are designed to maintain stability at AV = +1V/V without external components - confirmed in the datasheet's "Bandwidth" and "Stability" sections and validated in typical operating characteristics (toc13–toc14).
Can the MAX4471EKA+T drive a 100kΩ load rail-to-rail?
Yes, the MAX4471EKA+T guarantees rail-to-rail output swing within 4mV of VDD or VSS when driving a 100kΩ load. This specification is explicitly stated in the General Description and confirmed in Electrical Characteristics (VOL and VOH rows under RL = 100kΩ conditions).
What is the maximum capacitive load the MAX4471EKA+T can drive without oscillation?
The MAX4471EKA+T is stable with capacitive loads up to at least 250pF, as specified in the "Capacitive Load" parameter (CLOAD = 250pF min). The datasheet's stability plots (toc18, toc35) confirm stable operation at this value across resistive loads from 1kΩ to 1MΩ - essential for EMI filtering in noisy environments.
Is the MAX4471EKA+T pin-compatible with other devices in the MAX447x family?
The MAX4471EKA+T (8-pin SOT23) shares identical pinout with MAX4474EKA+T and MAX4474EUA+, but differs from MAX4470 variants (5-pin SC70/SOT23) and MAX4472 (14-pin TSSOP/SO). Pin compatibility is limited to same-package dual-channel parts - always verify pin function mapping using the "Pin Description" table before substitution.
MAX4471EKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- 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:
- SOT-23-8
MAX4471EKA+T FAQ
1.How can I place an order for MAX4471EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4471EKA+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 MAX4471EKA+T reliable?
The price and inventory of MAX4471EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4471EKA+T is usually 5 days.
3.What payment methods are accepted for MAX4471EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4471EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4471EKA+T?
MAX4471EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4471EKA+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 MAX4471EKA+T?
For technical support, including MAX4471EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4471EKA+T requirements.
6.How does Aetrix verify that MAX4471EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX4471EKA+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 MAX4471EKA+T meets industry standards.
7.What is the process for return or replacement of MAX4471EKA+T?
All MAX4471EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4471EKA+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 MAX4471EKA+T part is unused and in its original packaging.
Return procedure for MAX4471EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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