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Analog Devices Inc./Maxim Integrated MAX4461HETT+T
- Part No.:
- MAX4461HETT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4461HETT+T.pdf
- Description:
- IC INST AMP 1 CIRCUIT 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,920
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Product details
Overview
The MAX4461HETT+T from Maxim Integrated is a precision rail-to-rail output instrumentation amplifier with fixed gain of 100 V/V, ±0.1% gain accuracy, 100 µV input offset voltage, and 2.5 MHz gain-bandwidth product. It operates from a single 2.85V to 5.25V supply, draws only 700 µA quiescent current, and features logic-controlled shutdown for ultra-low-power operation - ideal for high-accuracy low-side current sensing in battery-powered medical equipment.
For engineers reviewing the MAX4461HETT+T datasheet, MAX4461HETT+T pinout, MAX4461HETT+T application, or MAX4461HETT+T equivalent, key selection considerations include its factory-trimmed G=100 configuration, ground-referenced output architecture, shutdown control interface, and TDFN-EP package suitability for space-constrained PCB layouts.
Technical Context
The MAX4461HETT+T implements Maxim's proprietary indirect current-feedback architecture, enabling ground-sensing capability while maintaining ultra-low 1 pA typical input bias current and >120 dB CMRR at DC. Its input stage uses MOS differential pairs optimized for small-signal differential voltages (2 mV–48 mV for G=100), with internal trimming ensuring ±0.1% gain error across temperature.
This device integrates a dedicated SHDN pin that, when driven low, disables internal transconductance stages and reduces supply current to <1 µA. The output remains high-impedance in shutdown, and the amplifier resumes full performance within microseconds upon SHDN assertion - supporting dynamic power management in portable instrumentation systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100 V/V - eliminates external resistor network, ensures stable closed-loop performance without layout sensitivity. |
| Gain Error | ±0.1% (typ) - enables direct measurement of microvolt-level signals without calibration in precision strain-gauge interfaces. |
| Input Offset Voltage | 100 µV (typ) - supports accurate amplification of sub-100 µV differential inputs in low-side current sense applications. |
| Supply Current | 700 µA (typ) - allows continuous operation in multi-channel sensor nodes powered by coin-cell batteries for >1 year. |
| Shutdown Current | 0.1 µA (typ) - reduces system standby power to nanoampere levels during idle periods in wearable medical devices. |
| Gain-Bandwidth Product | 2.5 MHz - delivers usable bandwidth up to 25 kHz at G=100, sufficient for ECG signal conditioning and fast-response transducer interfaces. |
| Input Bias Current | 1 pA (typ) - preserves signal integrity in high-impedance sensor bridges (e.g., piezoresistive pressure sensors) without loading errors. |
Pinout & Package
The MAX4461HETT+T is housed in a 6-pin TDFN-EP (Exposed Paddle) package, measuring 2.0 mm × 2.0 mm × 0.8 mm, with the exposed paddle thermally and electrically connected to GND for optimal thermal dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplified Output | Rail-to-rail output stage referenced to GND; drives 200 kΩ load with ≤0.2 mV VOL and ≤4 mV VOH at G=100. |
| 2 - GND | Negative Supply / Reference | Ground reference for input common-mode range (–0.1 V to VDD–1.85 V) and output swing; must be low-impedance connection. |
| 3 - IN+ | Positive Differential Input | High-impedance MOS input (2 GΩ common-mode, 2 GΩ differential); accepts small-signal differential inputs down to 2 mV at G=100. |
| 4 - IN− | Negative Differential Input | Matched high-impedance input complementary to IN+; enables rejection of common-mode noise up to 120 dB at DC. |
| 5 - VDD | Positive Supply | Single-supply input (2.85 V–5.25 V); PSRR >80 dB ensures stable gain under noisy rail conditions. |
| 6 - SHDN | Logic-Controlled Shutdown | CMOS-compatible input (VIH = 0.7×VDD, VIL = 0.3×VDD); pulls internal blocks offline to reduce IQ to <1 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Gain | G=100 configured at wafer test with ±0.1% accuracy - eliminates gain-setting resistors and associated tolerance/temperature drift errors. |
| Ground-Sensing Input Stage | Input common-mode range extends to –0.1 V below GND - enables direct interfacing with low-side shunt current sensors without level-shifting circuitry. |
| Rail-to-Rail Output | Delivers full output swing from GND to VDD - maximizes dynamic range in single-supply systems operating at 3.3 V or lower. |
| Ultra-Low Input Bias Current | 1 pA typical - prevents signal attenuation and offset shift in high-Z sensor interfaces such as pH electrodes or piezoelectric transducers. |
| Low Input-Referred Noise | 18 nV/√Hz at 10 kHz - preserves SNR in low-amplitude biomedical signal chains (e.g., EMG, EEG preamplifiers). |
Applications
| Strain-Gauge Amplifier | Precision Low-Side Current Sense |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from metal foil or semiconductor strain gauges in load cells and pressure sensors. IC Role / Device Role / Timing Role: Instrumentation amplifier providing fixed G=100 gain, high CMRR, and low offset to resolve microstrain-level changes. Use Value: ±0.1% gain accuracy and 100 µV offset enable <0.05% full-scale measurement error without system calibration. | Use Scenario: Measuring load current via milliohm shunt resistor placed between load and ground in portable medical monitors. IC Role / Device Role / Timing Role: Ground-referenced differential amplifier rejecting common-mode noise from switching regulators while amplifying shunt voltage. Use Value: Input common-mode range extending to –0.1 V allows direct connection to shunt; 1 pA bias current avoids shunt-loading errors. |
| Battery-Powered Medical Equipment | Industrial Process Control |
Use Scenario: Signal conditioning front-end for ECG/EMG acquisition in handheld diagnostic tools powered by Li-ion or coin-cell batteries. IC Role / Device Role / Timing Role: Low-power, high-precision instrumentation amplifier driving ADC input with minimal power overhead and no external passive components. Use Value: 700 µA supply current and <1 µA shutdown mode extend battery life; 2.5 MHz GBWP supports >25 kHz bandwidth for clinical-grade signal fidelity. | Use Scenario: Analog signal conditioning in PLC I/O modules interfacing with 4–20 mA transmitters, RTDs, or thermocouples. IC Role / Device Role / Timing Role: Precision gain block converting sensor outputs to standardized voltage ranges (e.g., 0–5 V) for microcontroller ADCs. Use Value: ±0.1% gain error and 1.5 µV/°C offset drift ensure long-term stability across industrial temperature ranges (–40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA | Three-op-amp topology; G=1–10,000 via external resistor; higher 125 µV offset; 1.3 mA IQ | Requires external gain-setting resistor; less suitable for ultra-low-power designs; better for variable-gain systems | Select when adjustable gain and higher output drive (>20 mA) are required, and board space permits SO-8 footprint. |
| AD8221ARMZ | Two-op-amp architecture; G=1–1000 via external resistor; 25 µV offset; 900 µA IQ; 10 MHz GBWP | Higher bandwidth but requires external gain network; superior offset spec but larger SO-8 package | Choose for higher-speed applications (>100 kHz) where gain flexibility and lower offset outweigh fixed-gain simplicity. |
Compared with INA128UA and AD8221ARMZ, the MAX4461HETT+T offers the smallest footprint (2 mm × 2 mm TDFN), lowest quiescent current (700 µA), and factory-trimmed G=100 - making it optimal for miniaturized, battery-sensitive instrumentation where gain stability and layout simplicity are critical.
Availability
The MAX4461HETT+T is available at Aetrix Electronics and suitable for precision low-side current sense, strain-gauge amplifier, and battery-powered medical equipment applications requiring stable component supply, guaranteed long-term availability, and traceable sourcing.
Supply support for MAX4461HETT+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 high-performance analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX4461HETT+T belongs to the MAX4460/MAX4461/MAX4462 family - engineered specifically for space-constrained, single-supply instrumentation systems requiring precision, low power, and rail-to-rail output performance.
FAQ
What is the gain configuration of the MAX4461HETT+T?
The MAX4461HETT+T is factory-trimmed for fixed gain of 100 V/V (suffix 'H' denotes G=100). Unlike the MAX4460, it does not require external resistors to set gain - eliminating resistor tolerance errors and PCB layout sensitivity. This configuration is verified across temperature and process corners per Maxim's production test flow.
Does the MAX4461HETT+T support dual-supply operation?
No, the MAX4461HETT+T is specified only for single-supply operation from 2.85 V to 5.25 V. Its output is internally referenced to GND, and the input common-mode range extends from –0.1 V to VDD–1.85 V. For dual-supply applications requiring bipolar output swing, consider the MAX4462HETT+T instead.
What is the function of the SHDN pin on the MAX4461HETT+T?
The SHDN pin on the MAX4461HETT+T is a logic-controlled shutdown input. Driving SHDN low disables internal transconductance and amplifier stages, reducing supply current to <1 µA. The output enters high-impedance state. Drive SHDN high (≥0.7×VDD) or connect to VDD for normal operation.
Can the MAX4461HETT+T be used with a 3.3 V supply?
Yes, the MAX4461HETT+T is fully specified for operation at 3.3 V (within its 2.85 V–5.25 V range). At VDD = 3.3 V, it maintains 700 µA typical supply current, 100 µV offset, and rail-to-rail output swing from GND to 3.3 V - making it ideal for modern low-voltage embedded systems.
What package type is used for the MAX4461HETT+T?
The MAX4461HETT+T is supplied in a 6-pin TDFN-EP (Thin Dual Flat No-lead with Exposed Paddle) package, 2.0 mm × 2.0 mm × 0.8 mm. The exposed paddle must be soldered to a GND plane for thermal and electrical performance - confirmed in Maxim's official package drawing 21-0137.
MAX4461HETT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.25V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- 25 kHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- 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:
- 6-TDFN (3x3)
MAX4461HETT+T FAQ
1.How can I place an order for MAX4461HETT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4461HETT+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 MAX4461HETT+T reliable?
The price and inventory of MAX4461HETT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4461HETT+T is usually 5 days.
3.What payment methods are accepted for MAX4461HETT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4461HETT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4461HETT+T?
MAX4461HETT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4461HETT+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 MAX4461HETT+T?
For technical support, including MAX4461HETT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4461HETT+T requirements.
6.How does Aetrix verify that MAX4461HETT+T is sourced from the original manufacturer or authorized distributors?
All MAX4461HETT+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 MAX4461HETT+T meets industry standards.
7.What is the process for return or replacement of MAX4461HETT+T?
All MAX4461HETT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4461HETT+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 MAX4461HETT+T part is unused and in its original packaging.
Return procedure for MAX4461HETT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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