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Analog Devices Inc./Maxim Integrated MAX4163EUA-T
- Part No.:
- MAX4163EUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4163EUA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,227
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Product details
Overview
MAX4163EUA-T from Maxim Integrated is a micropower, single-supply, rail-to-rail input/output operational amplifier in an 8-pin µMAX® package. It delivers 200kHz gain-bandwidth product, 25μA quiescent current per amplifier, ±0.5mV typical input offset voltage (25°C), and operates from 2.5V to 10V single supply. It is unity-gain stable and drives any capacitive load - ideal for low-power pH probe signal conditioning.
For engineers reviewing the MAX4163EUA-T datasheet, MAX4163EUA-T pinout, MAX4163EUA-T application, or MAX4163EUA-T equivalent, key selection criteria include ultra-low quiescent current, true rail-to-rail I/O swing beyond supply rails by ±250mV, 1.0pA input bias current, and stability with full capacitive loading - critical for battery-powered medical and portable instrumentation.
Technical Context
The MAX4163EUA-T uses a proprietary BiCMOS architecture with an internal charge pump generating rails ~2V beyond VDD/VSS, enabling true rail-to-rail input common-mode range (VSS − 0.25V to VDD + 0.25V) and output swing within 30mV of rails at 10kΩ load. This eliminates mid-swing CMRR degradation seen in conventional rail-to-rail op amps.
Its unity-gain stability with any capacitive load stems from internal compensation optimized for low-power operation, while high open-loop gain (>85dB) and excellent PSRR (80–110dB) are maintained across temperature (−40°C to +85°C) and supply voltage (2.5V–10V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 10V single supply - supports direct interfacing with Li-ion, coin-cell, and 3.3V/5V systems without level-shifting. |
| Quiescent Current | 25μA per amplifier - enables multi-year battery life in always-on sensor front-ends like ionization detectors. |
| Gain-Bandwidth Product | 200kHz - sufficient for DC–100Hz biomedical signal amplification (e.g., ECG, pH) with margin for filtering. |
| Input Offset Voltage | ±0.5mV (typ, +25°C); ±5mV (max, −40°C to +85°C) - ensures <0.1% error in precision 12-bit ADC interfaces. |
| Input Bias Current | 1.0pA (typ) - minimizes voltage error in high-impedance pH electrode and electrometer applications. |
| Rail-to-Rail Output Swing | VDD − 30mV / VSS + 30mV (RL = 10kΩ) - maximizes dynamic range in single-supply 3V systems. |
| Common-Mode Input Range | VSS − 0.25V to VDD + 0.25V - allows sensing signals below ground or above VDD, e.g., thermocouple cold-junction compensation. |
Pinout & Package
MAX4163EUA-T is housed in an 8-pin µMAX® package (package code U8-1), measuring 3.0mm × 3.0mm × 1.1mm, RoHS-compliant, with exposed pad for thermal enhancement.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives low-impedance loads up to 15mA short-circuit current; stable with >1µF capacitive load. |
| 2 | INA− | Inverting input - high-impedance node (RIN >10TΩ); sensitive to PCB leakage; requires guard ring in pH probe layouts. |
| 3 | INA+ | Noninverting input - accepts signals from VSS − 0.25V to VDD + 0.25V; enables true ground-referenced sensor biasing. |
| 4 | VSS | Negative power supply - must be connected directly to low-impedance ground plane; shared return for all analog signals. |
| 5 | OUTB | Amplifier B output - independent channel; no crosstalk specification provided for dual configuration in this variant. |
| 6 | INB− | Inverting input for amplifier B - electrically isolated from INA−; supports dual-channel differential sensing. |
| 7 | INB+ | Noninverting input for amplifier B - identical input specs to INA+; enables matched dual-path signal chains. |
| 8 | VDD | Positive power supply - bypass with 1μF + 0.1μF ceramic capacitors close to pin; internal charge pump draws transient current at power-up. |
Key Features
| Feature | Design Value |
|---|---|
| True rail-to-rail I/O with extended common-mode range | Inputs accept VSS − 0.25V to VDD + 0.25V; outputs swing to within 30mV of rails - preserves full ADC input range in 3V systems. |
| 1.0pA typical input bias current | Enables direct connection to >1GΩ pH electrodes without significant offset drift or calibration burden. |
| Unity-gain stable with any capacitive load | Eliminates need for external isolation resistors when driving ADC input capacitance or long cables - simplifies layout. |
| Internal charge pump (700kHz) | Generates internal rails ±2V beyond VDD/VSS - enables rail-to-rail performance without external components or efficiency penalty. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output during sensor transients (e.g., electrostatic discharge on pH probe tip). |
| Stable over −40°C to +85°C | Guaranteed parametric performance across industrial temperature range - suitable for portable medical devices used outdoors. |
Applications
| pH Probe Signal Conditioning | Portable Medical Instrumentation |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrodes (10⁹–10¹²Ω source impedance) in handheld analyzers. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage with ultra-low input bias current and rail-to-rail output swing. Use Value: 1.0pA input bias current prevents electrode polarization error; ±0.5mV VOS ensures <0.01pH measurement accuracy. |
Use Scenario: Front-end amplification for low-power ECG or pulse oximeter sensors in battery-operated wearable devices. IC Role / Device Role / Timing Role: Micropower, single-supply op amp providing gain and filtering before 12-bit SAR ADC sampling. Use Value: 25μA quiescent current extends battery life to >3 years; rail-to-rail I/O maximizes SNR with 3V supply. |
| Ionization Detector Interface | Low-Voltage Battery Monitoring |
Use Scenario: Converting picoamp-level current from air ionization chambers into measurable voltage in environmental monitors. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with guarded input and low-noise, low-input-current topology. Use Value: 1.0pA IB and 80nV/√Hz input noise enable detection of sub-100fA currents; stable with photodiode capacitance. |
Use Scenario: Precision voltage monitoring of Li-ion or alkaline cells in IoT edge nodes, where supply headroom is minimal. IC Role / Device Role / Timing Role: High-accuracy voltage follower and divider buffer operating down to 2.5V supply. Use Value: Input common-mode range extending 250mV beyond rails allows accurate measurement of cell voltage near end-of-discharge (e.g., 2.7V cell on 3.0V rail). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV8542IDGKR | Higher quiescent current (425nA vs. 25μA), lower GBW (27kHz), no extended common-mode range (VSS to VDD only). | Not suitable for pH probes or sub-100pA current sensing; acceptable for general-purpose low-power buffering. | Choose TLV8542IDGKR only if higher speed is unnecessary and cost is primary constraint - not a functional replacement for MAX4163EUA-T in precision analog front-ends. |
| OPA316IDBVR | Lower quiescent current (400nA), higher GBW (10MHz), but input bias current 10pA (10× higher) and no rail-to-rail input beyond rails. | Unsuitable for high-Z electrode interfaces; better for higher-frequency sensor signal chains where speed matters more than input impedance. | Select OPA316IDBVR when bandwidth >100kHz is required and source impedance <10MΩ; avoid for pH, ionization, or electrometer use cases. |
Compared with TLV8542IDGKR and OPA316IDBVR, the MAX4163EUA-T uniquely combines 1.0pA input bias current, ±250mV extended input common-mode range, and 200kHz GBW at 25μA - making it irreplaceable in ultra-high-impedance, single-supply, low-voltage precision applications.
Availability
MAX4163EUA-T is available at Aetrix Electronics and suitable for pH probe signal conditioning, portable medical instrumentation, and low-voltage battery monitoring requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX4163EUA-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 MAX416x family was engineered specifically for micropower, single-supply, rail-to-rail op amp applications in portable and battery-constrained systems - emphasizing ultra-low IQ, high input impedance, and robust operation across wide voltage and temperature ranges.
FAQ
What is the maximum capacitive load the MAX4163EUA-T can drive while remaining stable?
The MAX4163EUA-T is unity-gain stable with any capacitive load, including values exceeding 1µF - confirmed in the datasheet's "Large Capacitive-Load Drive" test waveform (Figure MAX4162-36). This eliminates need for isolation resistors in ADC driver or cable-driving applications, unlike many micropower op amps that require careful compensation.
Does the MAX4163EUA-T support true rail-to-rail input operation below 2.5V supply?
Yes - although the guaranteed minimum supply is 2.5V, the MAX4163EUA-T typically achieves full rail-to-rail input operation down to 2.0V (per Figure MAX4162-34 in datasheet). Its input common-mode range extends 250mV beyond both rails regardless of supply voltage, enabling reliable sensing even during brown-out conditions.
How does the internal charge pump affect noise performance of the MAX4163EUA-T?
The MAX4163EUA-T's internal 700kHz charge pump introduces ~100µVP-P switching noise at the output, independent of gain and not referred to input. This noise lies well outside its 200kHz bandwidth and is typically filtered by downstream stages - verified in THD+N measurements showing 0.02% at 1kHz with 100kΩ load.
Is the MAX4163EUA-T pin-compatible with other variants in the MAX416x family?
No - the MAX4163EUA-T (dual op amp, µMAX®) has different pinout than MAX4162 (single, SO/SOT23) and MAX4164 (quad, SO). Even among MAX4163 packages, UCSP (MAX4163EBL+T) and SO (MAX4163ESA+) differ in pin mapping. Always verify pin functions using the "Pin Description" table (page 8 of datasheet) for each specific variant.
What is the recommended power supply bypassing for the MAX4163EUA-T?
Per datasheet Application Information section, bypass VDD with a 1µF tantalum or aluminum electrolytic capacitor in parallel with a 0.1µF ceramic capacitor, placed as close as possible to pins 4 (VSS) and 8 (VDD). This suppresses charge-pump transients and maintains PSRR >80dB across frequency.
MAX4163EUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.115V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 25µA (x2 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4163EUA-T FAQ
1.How can I place an order for MAX4163EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4163EUA-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 MAX4163EUA-T reliable?
The price and inventory of MAX4163EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4163EUA-T is usually 5 days.
3.What payment methods are accepted for MAX4163EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4163EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4163EUA-T?
MAX4163EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4163EUA-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 MAX4163EUA-T?
For technical support, including MAX4163EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4163EUA-T requirements.
6.How does Aetrix verify that MAX4163EUA-T is sourced from the original manufacturer or authorized distributors?
All MAX4163EUA-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 MAX4163EUA-T meets industry standards.
7.What is the process for return or replacement of MAX4163EUA-T?
All MAX4163EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4163EUA-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 MAX4163EUA-T part is unused and in its original packaging.
Return procedure for MAX4163EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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