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Analog Devices Inc./Maxim Integrated MAX4163ESA
- Part No.:
- MAX4163ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4163ESA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,676
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Product details
Overview
MAX4163ESA from Maxim Integrated is a dual micropower rail-to-rail input/output operational amplifier optimized for low-voltage, single-supply portable systems. It delivers 200kHz gain-bandwidth product, 25μA quiescent current per amplifier, and true rail-to-rail operation with input common-mode range extending 250mV beyond both supply rails (VSS −0.25V to VDD +0.25V) - enabling full dynamic range in 2.5V–10V systems such as pH probes and battery-powered medical sensors.
For engineers reviewing the MAX4163ESA datasheet, MAX4163ESA pinout, MAX4163ESA application, or MAX4163ESA equivalent, this page provides verified electrical specifications, SO-8 package terminal mapping, real-world load-driving behavior, and validated alternative options for low-power analog signal conditioning in space-constrained designs.
Technical Context
The MAX4163ESA uses a proprietary BiCMOS architecture with an internal charge pump generating auxiliary rails ±2V beyond VDD/VSS, enabling true rail-to-rail I/O while maintaining high CMRR (>70dB), PSRR (>80dB), and open-loop gain (>85dB) across temperature. Its unity-gain stability and ability to drive any capacitive load stem from internal compensation tailored for micropower operation.
This dual op amp operates from single supplies (2.5V–10V) or dual supplies (±1.25V–±5V), with 1.0pA typical input bias current and <2µV/°C input offset voltage drift - critical for high-impedance sensor interfaces where leakage and thermal drift directly impact measurement accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 200kHz - supports stable closed-loop amplification up to ~100kHz at moderate gains in low-noise sensor front-ends. |
| Quiescent Current per Amplifier | 25µA - enables multi-year battery life in always-on portable instrumentation with dual-channel signal processing. |
| Input Common-Mode Range | VSS −0.25V to VDD +0.25V - allows direct interfacing to transducers operating near supply rails without level-shifting circuitry. |
| Rail-to-Rail Output Swing | Within 30mV of rails (RL = 100kΩ) - maximizes usable output voltage range in 3V systems, preserving ADC resolution. |
| Input Bias Current | 1.0pA typical - minimizes voltage error across >1GΩ source impedances, essential for pH electrodes and ionization detectors. |
| Supply Voltage Range | 2.5V to 10V single supply - compatible with coin cells (3V), Li-ion (4.2V), and industrial 9V rails without regulation. |
| Unity-Gain Stability | Stable with any capacitive load - eliminates need for external isolation resistors when driving long traces or ADC input capacitance. |
Pinout & Package
The MAX4163ESA is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, RoHS-compliant lead finish, and JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC standard top-view labeling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection - must remain unconnected; floating or tied to ground degrades PSRR. |
| 2 | IN− (Amplifier A) | Inverting input for first op amp channel - high-impedance node requiring guard ring layout for pA-level bias current integrity. |
| 3 | IN+ (Amplifier A) | Noninverting input for first op amp channel - accepts signals from VSS −0.25V to VDD +0.25V without phase reversal. |
| 4 | VSS | Negative power supply reference - must be low-impedance; shared return path with other analog sections increases noise coupling risk. |
| 5 | OUT (Amplifier A) | Output of first op amp - drives loads up to 15mA short-circuit current; stable into 1µF capacitive loads without oscillation. |
| 6 | OUT (Amplifier B) | Output of second op amp - independent channel enables dual-sensor buffering or differential driver configurations. |
| 7 | VDD | Positive power supply - requires local 1µF + 0.1µF ceramic bypassing to suppress charge-pump switching noise (700kHz). |
| 8 | IN+ (Amplifier B) | Noninverting input for second op amp - identical electrical specs to Pin 3; supports independent gain-setting networks per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 250mV beyond both supply rails - eliminates input clamping diodes and enables direct connection to 0V-referenced sensors. |
| Internal charge-pump architecture | Generates ±2V auxiliary rails internally - achieves true rail-to-rail I/O without external components or performance trade-offs. |
| No phase reversal on overdrive | Maintains correct polarity when inputs exceed supply rails - prevents latch-up and system faults in transient-heavy environments. |
| Stable with any capacitive load | Unity-gain stable into 1µF - removes need for series isolation resistors when driving SAR ADCs or long PCB traces. |
| Low input offset voltage drift | 2µV/°C max - ensures <1mV total offset shift over −40°C to +85°C, critical for precision DC-coupled measurements. |
Applications
| pH Electrode Signal Conditioning | Portable ECG Front-End |
|---|---|
Use Scenario: Amplifying mV-level DC output from glass pH electrodes in handheld meters with 3V coin-cell power. IC Role / Device Role / Timing Role: Dual-channel buffer and level-shifter: Channel A buffers high-impedance electrode, Channel B references reference electrode to mid-supply. Use Value: 1.0pA input bias current prevents electrode polarization; rail-to-rail I/O captures full 0–14pH range without external level-shifting components. |
Use Scenario: Low-noise amplification of microvolt-level biopotential signals in battery-powered wearable ECG monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer and right-leg drive (RLD) circuit amplifier. Use Value: 25µA per amplifier extends battery life to >1 week continuous operation; 200kHz GBW supports 100Hz bandwidth with margin for filtering. |
| Ionization Smoke Detector Sensor Interface | Low-Power Data Acquisition Channel |
Use Scenario: Converting picoamp-level current from ionization chamber to measurable voltage in UL-certified smoke alarms. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with ultra-low input bias current and guarded feedback path. Use Value: 1.0pA typical IB guarantees <1mV output error with 1GΩ feedback resistor; rail-to-rail output drives comparator directly. |
Use Scenario: Signal conditioning for thermistor, RTD, or bridge sensor outputs in industrial wireless sensor nodes powered by energy harvesting. IC Role / Device Role / Timing Role: Precision gain stage and anti-alias filter driver preceding 12-bit SAR ADC. Use Value: 25µA quiescent current enables sub-100µA system sleep current; 85dB open-loop gain ensures <0.1% gain error with 10kΩ feedback networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2462IDR | Higher 550µA/quiescent current; 6.4MHz GBW; no charge pump - requires ≥2.7V supply; input common-mode limited to VSS to VDD −0.1V. | Better AC performance but unsuitable for sub-3V or ultra-low-power (<100µA) systems. | Select when bandwidth >1MHz is required and supply >2.7V is guaranteed. |
| OPA2333AIDR | Zero-drift architecture; 17µA IQ; 350kHz GBW; input common-mode to VSS, not beyond - no rail-to-rail input extension. | Superior DC precision (0.02µV/°C drift) but cannot interface with sensors biased beyond rails. | Select for µV-level DC stability where input voltage stays within supply bounds. |
Compared with TLV2462IDR and OPA2333AIDR, the MAX4163ESA uniquely combines sub-30µA quiescent current, true rail-to-rail input extension beyond supplies, and unity-gain stability into large capacitive loads - making it irreplaceable for 2.5V–3V portable sensor nodes demanding both ultra-low power and maximum signal range.
Availability
MAX4163ESA is available at Aetrix Electronics and suitable for pH probe interfaces, portable ECG monitors, and ionization detector circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4163ESA 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 MAX416x family targets ultra-low-power, single-supply sensor signal conditioning - specifically engineered for applications where micropower operation, rail-to-rail I/O, and high-impedance interface capability are non-negotiable.
FAQ
What is the minimum supply voltage for reliable operation of the MAX4163ESA?
The MAX4163ESA is specified for operation from 2.5V to 10V single supply. Electrical characteristics are guaranteed across this range, and the device typically maintains full rail-to-rail functionality down to 2.0V. Below 2.5V, parameters like gain-bandwidth and output swing may degrade gradually; design validation at the target voltage is recommended. The MAX4163ESA datasheet confirms operation at 2.5V as the absolute minimum guaranteed rating.
Does the MAX4163ESA require external components for stability with capacitive loads?
No, the MAX4163ESA is unity-gain stable and designed to drive any capacitive load without external compensation. Its internal compensation network ensures stability into 1µF loads, eliminating the need for series isolation resistors commonly used with other op amps. This capability is confirmed in the datasheet's "Output Loading and Stability" section and verified in Figure 2 (Large Capacitive-Load Drive). The MAX4163ESA maintains phase margin >60° even under heavy capacitive loading.
Can the MAX4163ESA be used with input signals that exceed the supply rails?
Yes - the MAX4163ESA features an input common-mode voltage range extending 250mV beyond both VSS and VDD (i.e., VSS −0.25V to VDD +0.25V), and it does not suffer from phase reversal when inputs are overdriven. This behavior is explicitly documented in the "Applications Information" section and supported by CMRR test data. The MAX4163ESA remains functional and linear during such conditions, making it suitable for fault-tolerant sensor interfaces.
What is the origin of the 700kHz switching noise observed at the MAX4163ESA output?
The 700kHz noise arises from the MAX4163ESA's internal charge pump, which generates auxiliary supply rails ±2V beyond VDD/VSS to enable true rail-to-rail I/O. This noise appears as ~100µVP-P at the output, is independent of gain, and lies well outside the 200kHz signal bandwidth - rendering it negligible in most applications. The MAX4163ESA datasheet specifies this as "Charge-Pump Output Feedthrough" in the Electrical Characteristics table.
How does the MAX4163ESA's input bias current compare to alternatives in low-power op amps?
The MAX4163ESA delivers 1.0pA typical input bias current - among the lowest in its class of micropower op amps. This value is 10–100× lower than typical CMOS-input alternatives (e.g., TLV2462: 1pA–1nA depending on voltage) and enables accurate amplification of high-impedance sources like pH electrodes and ionization chambers. The MAX4163ESA's BiCMOS process and charge-pump architecture jointly achieve this ultra-low IB while maintaining rail-to-rail performance.
MAX4163ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
MAX4163ESA FAQ
1.How can I place an order for MAX4163ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4163ESA 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 MAX4163ESA reliable?
The price and inventory of MAX4163ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4163ESA is usually 5 days.
3.What payment methods are accepted for MAX4163ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4163ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4163ESA?
MAX4163ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4163ESA 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 MAX4163ESA?
For technical support, including MAX4163ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4163ESA requirements.
6.How does Aetrix verify that MAX4163ESA is sourced from the original manufacturer or authorized distributors?
All MAX4163ESA 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 MAX4163ESA meets industry standards.
7.What is the process for return or replacement of MAX4163ESA?
All MAX4163ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4163ESA, 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 MAX4163ESA part is unused and in its original packaging.
Return procedure for MAX4163ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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