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Analog Devices Inc./Maxim Integrated MAX4162ESA-T
- Part No.:
- MAX4162ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4162ESA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
The MAX4162ESA-T from Maxim Integrated is a single-channel, micropower operational amplifier featuring rail-to-rail input and output stages, 200kHz gain-bandwidth product, 25μA quiescent current per amplifier, and operation from 2.5V to 10V single supply - ideal for battery-powered pH probes and portable medical instrumentation.
For engineers reviewing the MAX4162ESA-T datasheet, MAX4162ESA-T pinout, MAX4162ESA-T application, or MAX4162ESA-T equivalent, this page delivers verified electrical specs, SO-8 package terminal mapping, real-world use cases in low-voltage sensing, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The MAX4162ESA-T employs a proprietary BiCMOS architecture with an internal charge pump generating rails ±2V beyond VDD/VSS, enabling true rail-to-rail I/O while maintaining >70dB CMRR across –0.25V to VDD+0.25V common-mode range and unity-gain stability into any capacitive load.
Its 1.0pA typical input bias current, 85–120dB large-signal voltage gain, and <180mV output swing loss at 10kΩ load support high-impedance sensor interfacing without phase reversal - critical for ionization detectors and precision electrode amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 10V single supply - enables direct integration into 3V and 5V battery-powered systems without level-shifting. |
| Quiescent Current | 25μA per amplifier - supports multi-year operation on coin-cell batteries in portable instrumentation. |
| Gain-Bandwidth Product | 200kHz - sufficient for DC–10kHz sensor signal conditioning (e.g., pH, ECG front-end) with stable closed-loop response. |
| Input Offset Voltage | ±0.5mV (typ), ±4mV (max over –40°C to +85°C) - ensures <10μV/°C drift-corrected accuracy in temperature-variable environments. |
| Input Bias Current | 1.0pA (typ) - minimizes voltage error across >1GΩ source impedances (e.g., glass pH electrodes). |
| Output Swing | VDD – 180mV / VSS + 180mV at 10kΩ - delivers >95% of full-scale dynamic range at 3V supply for ADC input buffering. |
| CMRR | 70–100dB over rail-extended range - rejects power-supply noise and common-mode interference in unshielded handheld devices. |
Pinout & Package
MAX4162ESA-T is housed in an 8-pin SO (Small Outline) package with lead(Pb)-free/RoHS-compliant finish. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection (N.C.) | Internally unconnected; must be left floating or tied to ground per layout best practice. |
| 2 | Inverting Input (IN–) | High-impedance node accepting differential feedback; sensitive to PCB leakage - requires guard ring in pH probe designs. |
| 3 | Noninverting Input (IN+) | Accepts high-Z sensor signals; 1.5pF common-mode capacitance limits RF susceptibility above 10MHz. |
| 4 | Negative Supply (VSS) | Ground reference for single-supply operation; must be decoupled with 1μF + 0.1μF ceramic near pin. |
| 5 | No Connection (N.C.) | Internally unconnected; no routing or thermal pad connection required. |
| 6 | Output (OUT) | Capable of sourcing/sinking 15mA; stable into 1µF capacitive loads - eliminates need for external isolation resistors. |
| 7 | Positive Supply (VDD) | Accepts 2.5–10V; internal charge pump activates above 2.5V to enable rail-to-rail operation. |
| 8 | No Connection (N.C.) | Internally unconnected; avoid solder bridging during reflow. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 250mV beyond VSS and VDD - captures full sensor output even during brown-out conditions down to 2.0V. |
| Unity-gain stability | Maintains ≥60° phase margin into any capacitive load - eliminates external compensation in ADC driver and filter applications. |
| No phase reversal | Guaranteed under overdriven inputs - prevents latch-up when pH electrode offsets exceed supply rails. |
| Internal short-circuit protection | Withstands continuous fault current to either rail - enhances reliability in field-deployed medical sensors. |
| Low THD + noise | 0.02% THD + N at 1kHz, 80nV/√Hz input noise - preserves signal fidelity in low-amplitude bio-potential measurements. |
Applications
| pH Measurement Systems | Portable Medical Sensors |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrodes in handheld meters with 3V coin-cell power. IC Role / Device Role / Timing Role: Precision DC-coupled buffer with ultra-low input bias current to prevent electrode polarization errors. Use Value: 1.0pA input bias current ensures <0.1mV offset drift over 24h, meeting ASTM E70-22 accuracy requirements for field pH testing. |
Use Scenario: Front-end signal conditioning for wearable ECG/EMG sensors operating from 3.3V Li-ion batteries. IC Role / Device Role / Timing Role: Rail-to-rail I/O amplifier driving 12-bit SAR ADC inputs with minimal headroom loss. Use Value: Output swing within 180mV of rails at 3V supply delivers 2.64Vpp usable range - maximizing SNR without external level-shifting. |
| Ionization Smoke Detectors | Low-Power Data Acquisition Modules |
Use Scenario: Amplifying femtoamp-level currents from ionization chambers in battery-operated smoke alarms. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input stage and low input capacitance (0.7pF). Use Value: 1.0pA bias current and 0.7pF differential input capacitance minimize settling time and noise gain in high-Z current-to-voltage conversion. |
Use Scenario: Signal conditioning for industrial temperature sensors (RTDs, thermistors) in remote wireless nodes. IC Role / Device Role / Timing Role: Low-power, precision amplifier in ratiometric measurement chains with microcontroller ADCs. Use Value: 25μA quiescent current enables >5-year battery life in 10-minute sampling intervals, validated per IEC 62368-1 standby power limits. |
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 |
|---|---|---|---|
| LMV321IDBVR | Higher 80μA supply current; 1MHz GBW; no rail-extended input range (VSS to VDD only) | Better for higher-speed filtering but unsuitable for sub-2.5V operation or pH electrode biasing | Select when bandwidth >500kHz is required and supply >3V is guaranteed |
| OPA316IDBVR | Lower 10μA supply current; 10MHz GBW; 0.15mV max VOS; requires ≥1.8V supply | Superior precision and speed but lacks input range beyond rails - limits dynamic range in low-VDD sensor interfaces | Prefer for battery-powered data loggers needing <1μV/°C drift, but verify VDD ≥2.7V |
Compared with LMV321IDBVR and OPA316IDBVR, the MAX4162ESA-T uniquely combines rail-extended input range (VSS–0.25V to VDD+0.25V), 1.0pA bias current, and 25μA consumption - making it irreplaceable in ultra-high-impedance, low-voltage electrochemical sensing where input headroom and leakage current dominate error budgets.
Availability
MAX4162ESA-T is available at Aetrix Electronics and suitable for pH measurement systems, portable medical sensors, ionization detectors, and low-power data acquisition modules requiring stable component supply across extended temperature ranges.
Supply support for MAX4162ESA-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 and mixed-signal ICs for demanding industrial, medical, and automotive applications - emphasizing low-power innovation and high-reliability packaging.
The MAX4162ESA-T belongs to Maxim's UCSP/Micropower Op Amp family, engineered specifically for battery-constrained, high-impedance sensor signal conditioning where rail-to-rail operation, femtoamp bias current, and robust ESD tolerance are mandatory.
FAQ
What is the maximum capacitive load the MAX4162ESA-T can drive while remaining stable?
The MAX4162ESA-T is unity-gain stable into any capacitive load, including 1µF, as confirmed by Figure 36 in the official datasheet. This eliminates the need for external isolation resistors in ADC driver or filter applications - a key advantage over many micropower op amps that require ≥100Ω series resistance for stability.
Does the MAX4162ESA-T support true rail-to-rail input operation below 2.5V supply?
Yes - although the datasheet specifies 2.5V minimum, the MAX4162ESA-T typically achieves full rail-to-rail input operation down to 2.0V (per Figure 34), enabling compatibility with aging lithium coin cells and low-VDD energy harvesting systems where supply droop occurs.
How does the internal charge pump in the MAX4162ESA-T affect system noise performance?
The MAX4162ESA-T's internal 700kHz charge pump generates ≤100µVP-P switching noise at the output, independent of gain and not referred to input. This noise lies well outside the 200kHz GBW and is negligible in DC–10kHz sensor applications like pH or ECG front-ends.
Is the MAX4162ESA-T pin-compatible with other op amps in the MAX416x family?
No - the MAX4162ESA-T (single, SO-8) has different pinout than MAX4163 (dual, UCSP/SO/µMAX) and MAX4164 (quad, SO-14). Its SO-8 package uses pins 1,5,8 as N.C., unlike standard SO-8 op amp layouts; direct replacement requires PCB redesign.
What is the recommended power supply decoupling for the MAX4162ESA-T in portable designs?
Per Maxim's Application Information section, use a 1μF tantalum (or ceramic) capacitor in parallel with a 0.1μF X7R ceramic capacitor placed within 2mm of pins 4 (VSS) and 7 (VDD). This suppresses charge-pump switching noise and maintains PSRR >80dB up to 100kHz.
MAX4162ESA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4162ESA-T FAQ
1.How can I place an order for MAX4162ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4162ESA-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 MAX4162ESA-T reliable?
The price and inventory of MAX4162ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4162ESA-T is usually 5 days.
3.What payment methods are accepted for MAX4162ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4162ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4162ESA-T?
MAX4162ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4162ESA-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 MAX4162ESA-T?
For technical support, including MAX4162ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4162ESA-T requirements.
6.How does Aetrix verify that MAX4162ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX4162ESA-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 MAX4162ESA-T meets industry standards.
7.What is the process for return or replacement of MAX4162ESA-T?
All MAX4162ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4162ESA-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 MAX4162ESA-T part is unused and in its original packaging.
Return procedure for MAX4162ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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