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Analog Devices Inc./Maxim Integrated MAX495ESA
- Part No.:
- MAX495ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX495ESA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,621
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Product details
Overview
MAX495ESA from Maxim Integrated is a single, micropower, rail-to-rail input/output operational amplifier optimized for low-voltage battery-powered systems. It operates from +2.7V to +6V single supply (or ±1.35V to ±3V dual), delivers 500kHz gain-bandwidth, draws ≤150µA per amplifier, and achieves 200µV max input offset voltage at +25°C - enabling precision signal conditioning in portable instrumentation and data acquisition.
For engineers reviewing the MAX495ESA datasheet, MAX495ESA pinout, MAX495ESA application, or MAX495ESA equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for legacy design support and obsolescence mitigation.
Technical Context
The MAX495ESA uses complementary NPN/PNP input stages to achieve rail-to-rail common-mode input range (VEE − 0.25V to VCC + 0.25V) and rail-to-rail output swing (within 50mV of rails into 100kΩ). Its folded-cascode architecture maintains 108dB large-signal voltage gain and 90dB CMRR while consuming only 150µA quiescent current per op amp.
It features no phase reversal under overdriven inputs, unity-gain stability, and drives ≥1nF capacitive loads without external compensation. Input offset voltage is trimmable via external 10kΩ potentiometer connected between pins 1 and 5 with wiper to VEE (pin 4), supporting <500µV max offset at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply (±1.35V to ±3V dual) - enables direct integration with Li-ion, coin-cell, and low-dropout regulator outputs. |
| Quiescent Current | 150µA max per amplifier - extends battery life in always-on sensor front-ends and portable data loggers. |
| Input Offset Voltage | 200µV typ / 500µV max at +25°C - supports 12-bit ADC interfacing with sub-LSB error (e.g., MAX187 with 4.096V reference). |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-aliasing, sensor amplification, and DC-coupled signal paths up to ~50kHz closed-loop bandwidth. |
| Output Voltage Swing | Within 50mV of VCC/VEE into 100kΩ - maximizes dynamic range in 3V systems, delivering >2.9Vpp output from 3V supply. |
| Common-Mode Rejection | 90dB min - rejects supply ripple and ground noise in single-supply mixed-signal PCB layouts. |
| Input Noise Density | 25nV/√Hz - preserves SNR in low-level transducer amplification (e.g., thermocouples, strain gauges). |
Pinout & Package
MAX495ESA is supplied in an 8-pin SO (Small Outline) package, 150mil body width, with standard industry op-amp pinout compatible with DIP-8 footprints. Pin 1 is top-left corner (notch/dot oriented), pin 8 is top-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Offset null input - connect one end of 10kΩ pot to this pin; used with pin 5 and VEE for trimming input offset voltage. |
| 2 | IN1− | Inverting input - high-impedance node (±25nA bias current); requires matched source resistance to IN1+ for offset minimization. |
| 3 | IN1+ | Noninverting input - complements IN1−; internal protection diodes limit differential input to ±0.7V. |
| 4 | VEE | Negative supply pin - connects to ground (single supply) or negative rail (dual supply); substrate tied to this pin. |
| 5 | NULL | Offset null input - connect other end of 10kΩ pot to this pin; wiper ties to VEE for bidirectional offset adjustment. |
| 6 | OUT1 | Amplifier output - rail-to-rail capable; stable driving ≥1nF capacitive load; sourcing/sinking limited to ±30mA short-circuit. |
| 7 | VCC | Positive supply pin - accepts +2.7V to +6V; bypass with 1µF + 0.1µF ceramic capacitor for low-noise operation. |
| 8 | N.C. | No connect - not internally bonded; must remain unconnected on PCB to avoid parasitic coupling or ESD path. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends VEE − 0.25V to VCC + 0.25V; output swings within 50mV of rails - preserves full-scale resolution in low-voltage ADC interfaces. |
| Trimmed input offset | External 10kΩ potentiometer across pins 1/5 with wiper to VEE enables ±6mV offset correction - critical for precision DC amplification. |
| Capacitive-load drive | Stable with >1nF pure capacitive load (1000pF) without isolation resistor - simplifies anti-aliasing filter design and reduces BOM count. |
| No phase reversal | Guaranteed non-inverting behavior even when input exceeds supply rails - eliminates latch-up risk in overvoltage transient conditions. |
| Micropower operation | 150µA max supply current per amplifier - allows continuous monitoring in energy-constrained IoT edge nodes with multi-year battery life. |
Applications
| Portable Equipment | Battery-Powered Instruments |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level sensor signals with 3V coin-cell supply. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier buffering thermistor or RTD bridge output before 16-bit sigma-delta ADC. Use Value: 200µV offset and 25nV/√Hz noise ensure <0.1% measurement accuracy; 150µA current extends 10-year battery life. |
Use Scenario: Portable gas detector using electrochemical sensor with µA-level output current. IC Role / Device Role / Timing Role: Transimpedance amplifier converting sensor current to voltage, followed by rail-to-rail buffer for ADC input. Use Value: Rail-to-rail output swing maximizes ADC utilization; no phase reversal prevents false alarms during sensor warm-up transients. |
| Data Acquisition | Signal Conditioning |
Use Scenario: Industrial data logger sampling multiple thermocouple channels via multiplexer and cold-junction compensation. IC Role / Device Role / Timing Role: Low-drift, low-noise amplifier providing gain and offset correction prior to SAR ADC conversion. Use Value: 90dB CMRR rejects shared ground noise; 500kHz GBW supports 10ksps sampling with adequate settling time. |
Use Scenario: Medical pulse oximeter analog front-end amplifying weak photodiode currents in ambient-light-rich environments. IC Role / Device Role / Timing Role: Dual-stage amplifier: first stage for transimpedance conversion, second for DC-blocking and gain. Use Value: Complementary input stage eliminates crossover distortion; 108dB open-loop gain ensures linearity over full 0–3V output range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | Single 1MHz GBW, 65µA IQ, rail-to-rail I/O, but 1.5mV max offset (10× higher than MAX495ESA) and no offset-null pins. | Acceptable for 8–10-bit systems where offset drift dominates; unsuitable for precision 12-bit+ DC measurements without calibration. | Select when cost and power are primary constraints and offset trimming is handled digitally or via system calibration. |
| MCP6001T-E/OT | Single 1MHz GBW, 100µA IQ, rail-to-rail I/O, 250µV max offset at +25°C, but no external null capability and narrower CM range (VEE to VCC − 0.2V). | Valid for general-purpose low-voltage buffering; lacks robustness for over-rail input conditions and fine analog trimming. | Choose for new designs requiring active production support and RoHS compliance; verify input overvoltage tolerance in target layout. |
Compared with LMV321IDBVR and MCP6001T-E/OT, the MAX495ESA offers superior DC precision (200µV offset, trimmable), wider rail-to-rail input range (VEE − 0.25V), and proven stability with >1nF loads - making it irreplaceable in legacy high-accuracy analog systems despite its Not Recommended for New Designs status.
Availability
MAX495ESA is available at Aetrix Electronics and suitable for portable equipment, battery-powered instruments, and data acquisition systems requiring stable component supply for long-lifecycle industrial and medical maintenance programs.
Supply support for MAX495ESA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX495ESA belongs to the MAX492/MAX494/MAX495 family of micropower, single-supply rail-to-rail op amps designed specifically for precision, low-voltage signal conditioning in battery-operated and space-constrained systems.
FAQ
What is the operating temperature range for the MAX495ESA?
The MAX495ESA is specified for operation from −40°C to +85°C. This extended industrial temperature range ensures reliable performance in portable test equipment, outdoor environmental sensors, and automotive cabin electronics where ambient temperatures fluctuate widely. All key parameters - including input offset voltage (±950µV max), supply current (185µA max), and output swing - are guaranteed across this full range.
Does the MAX495ESA support rail-to-rail input and output simultaneously?
Yes, the MAX495ESA supports true rail-to-rail input common-mode voltage (VEE − 0.25V to VCC + 0.25V) and rail-to-rail output swing (within 50mV of VEE/VCC into 100kΩ). This simultaneous capability enables full dynamic range utilization in single-supply 3V systems - for example, amplifying a 0–3V sensor output to drive a 0–3V ADC input without level-shifting circuitry.
Can the input offset voltage of the MAX495ESA be trimmed, and how?
Yes, the MAX495ESA includes dedicated NULL pins (1 and 5) for external offset trimming. Connect a 10kΩ potentiometer between pins 1 and 5, with the wiper tied to VEE (pin 4). This configuration provides ±6mV trim range, reducing the typical 200µV offset to near-zero - essential for precision DC applications like weigh scales and medical instrumentation where offset drift directly impacts measurement accuracy.
Is the MAX495ESA stable when driving large capacitive loads?
Yes, the MAX495ESA is uniquely stable driving capacitive loads exceeding 1nF (1000pF) without external compensation. Unlike many CMOS rail-to-rail op amps, it maintains phase margin due to internal compensation optimized for low-quiescent-current operation. It remains stable with 10,000pF loads when paired with a small series isolation resistor (e.g., 47Ω), making it ideal for driving ADC input filters and long PCB traces.
Why is the MAX495ESA marked "Not Recommended for New Designs"?
The MAX495ESA is marked "Not Recommended for New Designs" because its fabrication process at an external wafer foundry has been discontinued. Maxim Integrated no longer manufactures new units, though existing inventory and second-source alternatives remain available. The datasheet is maintained for legacy design support, and Aetrix Electronics provides traceable, tested stock for repair, replacement, and long-term maintenance of deployed systems still relying on MAX495ESA.
MAX495ESA 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:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 500 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX495ESA FAQ
1.How can I place an order for MAX495ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX495ESA 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 MAX495ESA reliable?
The price and inventory of MAX495ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX495ESA is usually 5 days.
3.What payment methods are accepted for MAX495ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX495ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX495ESA?
MAX495ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX495ESA 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 MAX495ESA?
For technical support, including MAX495ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX495ESA requirements.
6.How does Aetrix verify that MAX495ESA is sourced from the original manufacturer or authorized distributors?
All MAX495ESA 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 MAX495ESA meets industry standards.
7.What is the process for return or replacement of MAX495ESA?
All MAX495ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX495ESA, 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 MAX495ESA part is unused and in its original packaging.
Return procedure for MAX495ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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