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Analog Devices Inc./Maxim Integrated MAX4461HEUT+T
- Part No.:
- MAX4461HEUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4461HEUT+T.pdf
- Description:
- IC INST AMP 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
The MAX4461HEUT+T from Maxim Integrated is a precision rail-to-rail output instrumentation amplifier with fixed gain of 100V/V, ±0.1% gain accuracy, 100µV 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 for ultra-low power operation-ideal for battery-powered medical sensors and industrial strain-gauge interfaces.
For engineers reviewing the MAX4461HEUT+T datasheet, MAX4461HEUT+T pinout, MAX4461HEUT+T application, or MAX4461HEUT+T equivalent, this page delivers verified electrical specs, validated pin functions, confirmed use cases in low-side current sensing and transducer interfacing, and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The MAX4461HEUT+T implements Maxim's proprietary indirect current-feedback architecture to achieve ground-sensing capability while maintaining ultra-low 1pA typical input bias current and high common-mode rejection (90–120dB). Its fixed 100V/V gain is factory-trimmed and laser-calibrated for ±0.1% accuracy at +25°C.
It uses a dedicated SHDN pin to disable internal transconductance stages, reducing supply current to <1µA. The output is internally referenced to GND, supporting unipolar signal amplification with rail-to-rail swing-enabling full-scale output from near 0V to VDD across its specified differential input range of ±2mV to ±48mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100V/V - eliminates external resistor network, reduces layout sensitivity and thermal drift. |
| Gain Error | ±0.1% (typ) at +25°C - enables high-accuracy DC-coupled measurements without system-level calibration. |
| Input Offset Voltage | 100µV (typ) - supports resolution down to ~1µV differential input when amplified. |
| Supply Current | 700µA (typ) at 5V - allows continuous operation in multi-channel portable instrumentation with tight power budgets. |
| Gain-Bandwidth Product | 2.5MHz - sustains 25kHz –3dB bandwidth at G=100, suitable for dynamic sensor signals including vibration and pulse waveforms. |
| Input Bias Current | 1pA (typ) - preserves signal integrity from high-impedance sources like piezoresistive bridges and pH electrodes. |
| Input Common-Mode Range | –0.1V to (VDD – 1.7V) - enables true ground-sensing operation with single-supply rails as low as 2.85V. |
| Output Swing | Rail-to-rail - delivers full dynamic range into 200kΩ load, minimizing headroom loss in low-voltage systems. |
Pinout & Package
MAX4461HEUT+T is packaged in a lead-free 6-pin SOT23 package (JEDEC MO-178AA), with exposed pad connected to GND for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplified Output | Delivers rail-to-rail voltage proportional to (IN+ – IN–) × 100; high-impedance in shutdown mode. |
| 2 (GND) | Negative Supply / Reference | Ground reference for input common-mode range, output swing, and internal biasing; connects to PCB ground plane. |
| 3 (IN+) | Positive Differential Input | High-impedance MOS input (1pA bias); accepts small-signal voltages within common-mode range. |
| 4 (IN–) | Negative Differential Input | Matched high-Z input; forms differential pair with IN+ for rejection of common-mode interference. |
| 5 (VDD) | Positive Supply | Accepts 2.85V–5.25V single supply; decoupling capacitor required at pin for stability. |
| 6 (SHDN) | Shutdown Control | CMOS-compatible logic input: low = shutdown (<1µA IDD), high = active; no pull-up required. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 100V/V gain | Eliminates external gain-setting resistors, removing matching errors, thermal coefficients, and board space. |
| Ground-sensing input stage | Supports differential measurement down to 0V common-mode-critical for low-side current sensing and bridge-based transducers. |
| 1pA typical input bias current | Prevents loading of high-impedance sensors (e.g., strain gauges, thermopiles), preserving signal fidelity and linearity. |
| Logic-controlled shutdown | Reduces supply current to <1µA while maintaining high-Z output, enabling duty-cycled sensing in energy-constrained devices. |
| 18nV/√Hz input-referred noise | Enables clean amplification of µV-level signals (e.g., microphone preamps, precision current shunts) without dominant noise contribution. |
| Single 2.85V–5.25V supply | Direct compatibility with Li-ion, coin-cell, and 3.3V/5V system rails-no charge pump or dual supply needed. |
Applications
| Industrial Process Control | Strain-Gauge Amplifiers |
|---|---|
Use Scenario: Monitoring pressure, flow, or level via 4-wire Wheatstone bridge sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Precision differential amplifier converting mV-level bridge imbalance into robust 0–5V analog output for ADC digitization. Use Value: ±0.1% gain accuracy and 100µV offset ensure <0.05% full-scale error over temperature-meeting Class A industrial sensor standards. | Use Scenario: Amplifying microvolt outputs from bonded foil or semiconductor strain gauges mounted on load cells or structural test fixtures. IC Role / Device Role / Timing Role: Fixed-gain instrumentation amplifier providing stable, low-noise gain before anti-alias filtering and sampling. Use Value: 1pA input bias prevents gauge resistance drift; rail-to-rail output maximizes ADC utilization with 3.3V supplies. |
| Transducer Interface | Precision Low-Side Current Sense |
Use Scenario: Signal conditioning for piezoelectric accelerometers, capacitive humidity sensors, or RTD bridges in condition-monitoring edge nodes. IC Role / Device Role / Timing Role: High-CMRR front-end amplifier rejecting EMI and ground-loop noise in noisy industrial environments. Use Value: 120dB CMRR at DC and 90dB up to 10kHz suppresses motor drive noise and switching supply ripple. | Use Scenario: Measuring load current by amplifying voltage drop across a shunt resistor placed between load and ground in battery management systems. IC Role / Device Role / Timing Role: Ground-referenced instrumentation amplifier enabling accurate bidirectional or unidirectional current detection. Use Value: True ground-sensing input allows direct connection to shunt-no level-shifting circuitry required, reducing BOM and error sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA/2K5 | Three-op-amp topology; 125µV max offset; 1.3mA supply current; no shutdown; SO-8 package. | Higher power, larger footprint, no low-power sleep mode-less suitable for portable or multi-channel designs. | Select for legacy designs requiring proven long-term reliability and wider supply range (±2.25V to ±18V). |
| AD8420ARMZ | Current-feedback architecture; 250µV max offset; 1.1mA supply current; shutdown available; MSOP-8 package. | Lower gain accuracy (±0.15% vs ±0.1%), higher noise (27nV/√Hz), but superior PSRR (120dB) and wider temp range (–40°C to +125°C). | Select when operating beyond +85°C or in high-PSRR environments such as motor control feedback loops. |
Compared with INA128UA/2K5 and AD8420ARMZ, the MAX4461HEUT+T offers the lowest quiescent current and smallest footprint for 100V/V gain, making it optimal for space- and power-constrained portable instrumentation-but requires careful attention to its narrower input common-mode range and +85°C max ambient rating.
Availability
MAX4461HEUT+T is available at Aetrix Electronics and suitable for industrial process control, strain-gauge amplification, and precision low-side current sensing requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for MAX4461HEUT+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 industrial, medical, and communications applications.
The MAX4461HEUT+T belongs to the MAX4460/MAX4461/MAX4462 family-engineered for high-accuracy, low-power instrumentation tasks where ground-sensing, rail-to-rail output, and factory-trimmed gain eliminate calibration overhead in sensor signal chains.
FAQ
What is the gain configuration of the MAX4461HEUT+T?
The MAX4461HEUT+T has a fixed gain of 100V/V, factory-laser-trimmed to ±0.1% accuracy at +25°C. Unlike the adjustable-gain MAX4460, it requires no external resistors-reducing design complexity and improving thermal stability. This gain is permanently set and cannot be modified externally.
Does the MAX4461HEUT+T support dual-supply operation?
No-the MAX4461HEUT+T is designed exclusively for single-supply operation from 2.85V to 5.25V. Its output and input stages are referenced to GND, and it lacks a VSS pin. For dual-supply applications requiring bipolar output swing, consider the MAX4462HETT+T instead.
What is the function of the SHDN pin on the MAX4461HEUT+T?
The SHDN pin on the MAX4461HEUT+T controls logic-based shutdown: driving it low disables internal transconductance and amplifier blocks, reducing supply current to <1µA. The output enters high-impedance state. Pulling SHDN high (or connecting to VDD) enables normal operation-no external pull-up is required.
Can the MAX4461HEUT+T be used for low-side current sensing?
Yes-the MAX4461HEUT+T is explicitly optimized for low-side current sensing due to its ground-sensing input architecture. It accepts common-mode voltages down to –0.1V relative to GND, allowing direct connection across a shunt resistor placed between load and ground-eliminating level-shifters and simplifying PCB layout.
What is the maximum differential input voltage for the MAX4461HEUT+T at G=100?
At G=100, the MAX4461HEUT+T is specified for differential input voltages from ±2mV to ±48mV under accuracy conditions. While it can tolerate larger inputs, performance degrades outside this range-particularly in linearity and offset error. For reliable 0.1% gain accuracy, keep VIN+ – VIN– ≤ ±48mV.
MAX4461HEUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 25 kHz
- 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-6
MAX4461HEUT+T FAQ
1.How can I place an order for MAX4461HEUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4461HEUT+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 MAX4461HEUT+T reliable?
The price and inventory of MAX4461HEUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4461HEUT+T is usually 5 days.
3.What payment methods are accepted for MAX4461HEUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4461HEUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4461HEUT+T?
MAX4461HEUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4461HEUT+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 MAX4461HEUT+T?
For technical support, including MAX4461HEUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4461HEUT+T requirements.
6.How does Aetrix verify that MAX4461HEUT+T is sourced from the original manufacturer or authorized distributors?
All MAX4461HEUT+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 MAX4461HEUT+T meets industry standards.
7.What is the process for return or replacement of MAX4461HEUT+T?
All MAX4461HEUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4461HEUT+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 MAX4461HEUT+T part is unused and in its original packaging.
Return procedure for MAX4461HEUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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