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Analog Devices Inc./Maxim Integrated MAX4461UEUT
- Part No.:
- MAX4461UEUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4461UEUT.pdf
- Description:
- IC INST AMP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,158
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Product details
Overview
The MAX4461UEUT from Maxim Integrated is a fixed-gain, rail-to-rail output instrumentation amplifier with factory-trimmed gain of 1 (suffix U), ±0.1% gain accuracy, 100µV typical input offset voltage, and 2.5MHz gain-bandwidth product. It operates from a single 2.85V–5.25V supply, draws only 700µA quiescent current, and features logic-controlled shutdown - making it ideal for precision low-side current sensing in battery-powered medical equipment.
For engineers reviewing the MAX4461UEUT datasheet, MAX4461UEUT pinout, MAX4461UEUT application, or MAX4461UEUT equivalent, key selection considerations include its ground-referenced unipolar output architecture, 1pA typical input bias current, shutdown current <1µA, input common-mode range extending to –0.1V (ground-sensing), and guaranteed ±0.1% gain error at +25°C for G = 1 configuration.
Technical Context
The MAX4461UEUT implements Maxim's proprietary indirect current-feedback architecture, converting differential input voltage to current via transconductance stages and using feedback to achieve high-precision gain control without traditional three-op-amp topology. This enables ground-sensing capability while maintaining ultra-low input bias current and enhanced CMRR.
It is factory trimmed for unity gain (G = 1) with ±0.1% gain error at +25°C, supports single-supply operation down to 2.85V, and integrates a dedicated SHDN pin that disables internal transconductance blocks to reduce supply current below 1µA. Its rail-to-rail output stage delivers full swing under light loads (e.g., 200kΩ), with VOL ≤ 0.2mV and VOH ≥ VDD – 4mV at RL = 20kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 1 V/V (factory-trimmed, suffix U) |
| Gain Error | ±0.1% at +25°C - ensures accurate unity-gain signal replication without external calibration |
| Input Offset Voltage | 100 µV typical - enables precise amplification of mV-level differential signals (e.g., shunt-based current sense) |
| Supply Current | 700 µA typical at 5V - supports ultra-low-power operation in portable and battery-powered systems |
| Shutdown Current | <1 µA at 5V - allows deep power-down during idle cycles without external switch control |
| Gain-Bandwidth Product | 2.5 MHz - supports bandwidths up to 2.5 MHz at G = 1, enabling fast response in dynamic sensor interfaces |
| Input Bias Current | 1 pA typical - preserves signal integrity in high-impedance source applications (e.g., strain gauges, piezoresistive sensors) |
Pinout & Package
MAX4461UEUT is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with exposed pad connected to GND for thermal performance. Pin 1 is OUT; Pin 2 is GND; Pin 3 is IN+; Pin 4 is IN−; Pin 5 is VDD; Pin 6 is SHDN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplified output node | Rail-to-rail output referenced to GND; drives loads up to 200kΩ with <0.2mV saturation near rails |
| 2 (GND) | Negative supply reference | Ground-sensing input common-mode range extends to –0.1V; serves as output reference and shutdown return path |
| 3 (IN+) | Positive differential input | High-impedance MOS input (1pA bias); accepts small-signal differential voltages down to 50mV for G = 1 |
| 4 (IN−) | Negative differential input | Matched to IN+; enables true ground-referenced differential measurement with no level-shifting required |
| 5 (VDD) | Positive supply input | Accepts 2.85V–5.25V single supply; PSRR >80 dB ensures immunity to supply noise |
| 6 (SHDN) | Logic-controlled shutdown enable | Active-low: pull to GND to enter sub-1µA shutdown; tie to VDD for normal operation; no external pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | Enables direct measurement of signals referenced to system ground (e.g., low-side shunt current sense) without level shifters |
| Factory-trimmed unity gain | Eliminates need for external gain-setting resistors and associated tolerance/temperature drift errors |
| Rail-to-rail output | Delivers full dynamic range from GND to VDD under light load, maximizing ADC utilization in 3.3V/5V systems |
| Ultra-low input bias current | 1pA typical preserves signal fidelity in high-Z sensor interfaces (e.g., pH electrodes, thermopiles) |
| Integrated shutdown control | Reduces supply current to <1µA without external FET switches or power sequencing complexity |
Applications
| Industrial Process Control | Strain-Gauge Amplifiers |
|---|---|
Use Scenario: Amplifying low-level differential outputs from 4–20mA loop-powered transmitters in PLC analog input modules. IC Role / Device Role / Timing Role: Precision unity-gain buffer and common-mode rejection front-end for industrial current/voltage signal conditioning. Use Value: ±0.1% gain accuracy and 100µV offset ensure <0.1% total system error over temperature without recalibration. |
Use Scenario: Conditioning mV-level Wheatstone bridge outputs from metal foil strain gauges in load cells and pressure sensors. IC Role / Device Role / Timing Role: High-input-impedance, low-noise instrumentation amplifier with ground-referenced inputs for bridge excitation and sensing. Use Value: 1pA input bias current prevents bridge imbalance errors; rail-to-rail output maximizes resolution when interfacing to 12-bit+ SAR ADCs. |
| Precision Low-Side Current Sense | Battery-Powered Medical Equipment |
Use Scenario: Measuring battery discharge current in portable ECG monitors and infusion pumps using shunt resistors placed between load and ground. IC Role / Device Role / Timing Role: Ground-sensing instrumentation amplifier providing accurate, isolated current measurement without high-side sensing complexity. Use Value: Input common-mode range down to –0.1V enables true low-side sensing; 700µA quiescent current extends battery life in always-on monitoring modes. |
Use Scenario: Signal conditioning for biopotential electrodes (e.g., EEG, EMG) in handheld diagnostic devices operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-power, low-noise front-end amplifier for amplifying microvolt-level bio-signals prior to digitization. Use Value: 18nV/√Hz input-referred noise and 2.5MHz GBWP support clean acquisition of fast neural transients while minimizing power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA333AIDBVR | Single-supply, rail-to-rail output; G = 1–1000 programmable; 25µV max offset; 50µA supply current | Lower power but requires external gain resistors; no shutdown pin; smaller offset but wider gain range reduces unity-gain accuracy vs. factory-trimmed MAX4461UEUT | Select for ultra-low-power designs where programmable gain justifies added resistor tolerance sensitivity and layout area |
| AD8420ARMZ | Fixed G = 10/100 only; 100µV max offset; 1.1mA supply current; no shutdown; SO-8 package | Higher supply current and no shutdown mode; SO-8 footprint incompatible with SOT23 PCB layout; optimized for higher gains, not unity | Select when G = 10 or 100 is required and board space permits SO-8; avoid for G = 1 or low-power shutdown-critical applications |
Compared with INA333AIDBVR and AD8420ARMZ, the MAX4461UEUT uniquely combines factory-trimmed unity gain, integrated shutdown, SOT23-6 footprint, and ground-sensing capability - delivering superior accuracy and integration for compact, battery-sensitive low-side current sensing.
Availability
MAX4461UEUT is available at Aetrix Electronics and suitable for industrial process control, precision low-side current sense, and battery-powered medical equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX4461UEUT 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, medical, and communications applications.
The MAX4461UEUT belongs to Maxim's precision instrumentation amplifier product line, designed specifically for low-power, ground-sensing signal conditioning in space-constrained, single-supply systems requiring high DC accuracy and rail-to-rail output swing.
FAQ
What is the gain configuration of the MAX4461UEUT?
The MAX4461UEUT is factory trimmed for fixed unity gain (G = 1 V/V), indicated by the "U" suffix in the part number. Unlike the adjustable-gain MAX4460 or REF-equipped MAX4462, the MAX4461UEUT requires no external resistors to set gain - ensuring ±0.1% gain accuracy at +25°C and eliminating resistor-induced errors in production.
Does the MAX4461UEUT support dual-supply operation?
No, the MAX4461UEUT is specified only for single-supply operation from 2.85V to 5.25V. Its internal architecture references all signals to GND, including the output and input common-mode range (–0.1V to VDD – 1.7V). For dual-supply applications requiring bipolar output swing, the MAX4462 series - which includes a dedicated REF pin - should be used instead of the MAX4461UEUT.
How does the SHDN pin function on the MAX4461UEUT?
The SHDN pin on the MAX4461UEUT is an active-low logic input: pulling it to GND places the device in shutdown mode, reducing supply current to <1µA at 5V. In shutdown, the output becomes high-impedance (>100kΩ), and internal transconductance stages are disabled. To operate normally, SHDN must be tied to VDD (or pulled high via external resistor); no external pull-up is required due to internal design.
What is the input common-mode voltage range for the MAX4461UEUT?
The MAX4461UEUT supports an input common-mode voltage range from –0.1V (100mV below GND) to VDD – 1.7V. This ground-sensing capability allows direct connection to low-side shunt resistors and other ground-referenced differential sources without level-shifting circuitry - a key differentiator versus conventional instrumentation amplifiers that require VCM ≥ VSS + 1.5V.
Can the MAX4461UEUT drive capacitive loads?
The MAX4461UEUT is stable with capacitive loads up to 100pF, as verified in the datasheet's Electrical Characteristics table. Driving larger capacitive loads (e.g., long PCB traces or ADC input capacitance >100pF) may cause peaking or oscillation. For such cases, a small series resistor (10–50Ω) should be added between the MAX4461UEUT output and the load to isolate capacitance and maintain stability without degrading bandwidth significantly.
MAX4461UEUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- 2.5 MHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- -
- Current - Supply:
- 800µA
- Current - Output / Channel:
- 150 mA
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX4461UEUT FAQ
1.How can I place an order for MAX4461UEUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4461UEUT 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 MAX4461UEUT reliable?
The price and inventory of MAX4461UEUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4461UEUT is usually 5 days.
3.What payment methods are accepted for MAX4461UEUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4461UEUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4461UEUT?
MAX4461UEUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4461UEUT 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 MAX4461UEUT?
For technical support, including MAX4461UEUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4461UEUT requirements.
6.How does Aetrix verify that MAX4461UEUT is sourced from the original manufacturer or authorized distributors?
All MAX4461UEUT 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 MAX4461UEUT meets industry standards.
7.What is the process for return or replacement of MAX4461UEUT?
All MAX4461UEUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX4461UEUT, 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 MAX4461UEUT part is unused and in its original packaging.
Return procedure for MAX4461UEUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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