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Analog Devices Inc./Maxim Integrated MAX495EPA+
- Part No.:
- MAX495EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX495EPA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
MAX495EPA+ 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), draws ≤150µA per amplifier, delivers 500kHz gain-bandwidth, and achieves 200µV max input offset voltage at +25°C - enabling precision signal conditioning in portable instrumentation and data acquisition.
For engineers reviewing the MAX495EPA+ datasheet, MAX495EPA+ pinout, MAX495EPA+ application, or MAX495EPA+ equivalent, key selection criteria include rail-to-rail common-mode range (VEE to VCC), output swing within 50mV of rails into 100kΩ, unity-gain stability, and µMAX package compatibility for space-constrained designs.
Technical Context
The MAX495EPA+ employs dual complementary input stages (NPN and PNP) to achieve rail-to-rail input common-mode voltage range extending 0.25V beyond VEE and VCC, with no phase reversal on overdrive. Its folded-cascode architecture supports high DC accuracy while maintaining low quiescent current.
It features internal input protection diodes and series resistors (1.7kΩ each) limiting differential input voltage to ~0.7V, and delivers stable operation driving ≥1nF capacitive loads without external compensation - verified across 1kΩ to 100kΩ resistive loads and up to 10,000pF with isolation resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply (±1.35V to ±3V dual) - enables direct interface with Li-ion, coin-cell, and low-dropout regulator outputs. |
| Quiescent Current | ≤150µA per amplifier - extends battery life in always-on sensor front-ends and portable meters. |
| Input Offset Voltage | 200µV (max at +25°C); trimmable via NULL pins (pins 1 & 5) - supports sub-LSB error in 12-bit ADC buffering (e.g., MAX187). |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-aliasing filters, sensor amplification, and low-frequency active filtering. |
| Output Voltage Swing | Within 50mV of VEE and VCC into 100kΩ - maximizes dynamic range in 3V systems (e.g., 0.05V–2.95V swing on +3V supply). |
| CMRR / PSRR | 90dB / 110dB (typ at +25°C) - rejects supply noise and common-mode interference in noisy industrial or mixed-signal PCBs. |
| Slew Rate | 0.2V/µs - adequate for <10kHz signals with <0.1% THD+N, preserving fidelity in audio and sensor signal chains. |
Pinout & Package
MAX495EPA+ is packaged in an 8-pin plastic DIP (dual in-line package) with industry-standard op-amp pinout. The package is through-hole mountable, RoHS-compliant, and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Offset null input - connect wiper of 10kΩ potentiometer to VEE (pin 4) for trimming input offset voltage. |
| 2 | IN1− | Inverting input - accepts feedback network or inverted signal path; matched impedance reduces bias-current-induced offset. |
| 3 | IN1+ | Noninverting input - high-impedance node for reference, sensor, or buffered signal; requires matched source resistance to IN1−. |
| 4 | VEE | Negative power-supply pin - connect to ground (single supply) or negative rail (dual supply); substrate tied to this pin. |
| 5 | NULL | Offset null input - second terminal of trim circuit; forms balanced pair with pin 1 for offset adjustment. |
| 6 | OUT | Amplifier output - drives loads up to 1kΩ resistively or >1nF capacitively; stable without isolation resistor in most configurations. |
| 7 | VCC | Positive power-supply pin - bypass with 1µF + 0.1µF ceramic capacitor close to pin for noise immunity. |
| 8 | N.C. | No connect - not internally bonded; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25V beyond VEE and VCC - allows direct sensing of signals at supply rails (e.g., battery voltage monitoring). |
| Rail-to-rail output swing | Reaches within 50mV of both rails into 100kΩ - preserves full ADC input range in 3V systems without level-shifting. |
| Unity-gain stable | Operates reliably as voltage follower or gain-of-one buffer - eliminates need for external compensation in basic configurations. |
| Input stage protection | Back-to-back diodes + 1.7kΩ series resistors limit differential input to ~0.7V - prevents latch-up during ESD or overvoltage transients. |
| Capacitive-load drive | Stable with >1nF loads; 10,000pF drivable using 47Ω isolation resistor - simplifies sensor cable interfacing and long-trace routing. |
| Low-noise performance | 25nV/√Hz input voltage noise density - maintains SNR in high-gain sensor amplifiers (e.g., thermopile, strain gauge). |
Applications
| Portable Equipment | Battery-Powered Instruments |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level sensor outputs with 3V coin-cell supply. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier providing rail-to-rail input range and low-offset buffering before 16-bit SAR ADC. Use Value: 200µV offset contributes <0.5 LSB error in 3V/16-bit system; 150µA quiescent current enables >1-year battery life. |
Use Scenario: Portable gas detector conditioning electrochemical sensor output (nA-level current, mV amplitude). IC Role / Device Role / Timing Role: Transimpedance amplifier with rail-to-rail output driving low-power microcontroller ADC. Use Value: 500kHz GBW supports fast response to gas concentration changes; rail-to-rail swing avoids clipping on low-VCC operation. |
| Data Acquisition | Signal Conditioning |
Use Scenario: Industrial data logger acquiring thermocouple and RTD signals across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Cold-junction compensation amplifier and programmable-gain stage preceding sigma-delta ADC. Use Value: 90dB CMRR rejects common-mode noise from shared ground; 2µV/°C tempco ensures <1°C drift over temperature range. |
Use Scenario: Audio preamplifier in battery-powered voice recorder, amplifying MEMS microphone output. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage with 0.003% THD+N at 1kHz. Use Value: 25nV/√Hz noise density preserves SNR; 0.2V/µs slew rate handles speech bandwidth without slew-induced distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | Higher quiescent current (80µA vs. 150µA max), lower GBW (1MHz), no offset trim pins. | Not suitable where sub-200µV offset or adjustable nulling is required; better for higher-speed, non-precision uses. | Select LMV321IDBVR only if higher speed is prioritized over ultra-low power and DC precision. |
| MCP6001T-E/OT | Lower quiescent current (100µA typ), same rail-to-rail I/O, but no NULL pins and higher offset (1.5mV max). | Lacks offset trimming capability; insufficient for <12-bit precision ADC buffering without calibration. | Choose MCP6001T-E/OT for cost-sensitive, moderate-accuracy applications where trimming is unnecessary. |
Compared with LMV321IDBVR and MCP6001T-E/OT, MAX495EPA+ uniquely combines trimmable offset, rail-to-rail operation down to 2.7V, and proven stability with >1nF loads - making it irreplaceable in high-accuracy, ultra-low-power portable measurement systems.
Availability
MAX495EPA+ is available at Aetrix Electronics and suitable for portable equipment, battery-powered instruments, and data acquisition systems requiring stable component supply and long-term design continuity.
Supply support for MAX495EPA+ 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 analog and mixed-signal ICs for power, interface, sensing, and timing applications.
The MAX495EPA+ 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-constrained environments.
FAQ
What is the operating temperature range for MAX495EPA+?
The MAX495EPA+ is specified for operation from -40°C to +85°C. This extended industrial temperature range ensures reliable performance in portable test equipment, outdoor sensors, and automotive cabin modules where ambient conditions vary widely. All key parameters - including input offset voltage, supply current, and CMRR - are guaranteed across this full range per the datasheet's DC electrical characteristics table.
Does MAX495EPA+ support single-supply operation?
Yes, MAX495EPA+ fully supports single-supply operation from +2.7V to +6V. Its rail-to-rail input common-mode range (VEE to VCC) and rail-to-rail output swing enable direct interfacing with low-voltage microcontrollers and ADCs without level-shifting circuitry. For example, with a +3V supply, inputs can range from 0V to 3V and outputs swing from ~0.05V to ~2.95V into 100kΩ - maximizing usable dynamic range.
Can MAX495EPA+ drive capacitive loads without oscillation?
Yes, MAX495EPA+ is explicitly characterized for stable operation with capacitive loads exceeding 1nF. It remains stable with up to 10,000pF when used with a 47Ω isolation resistor in series with the output (Figure 9b). Even without isolation, it drives ≥500pF reliably in unity-gain follower configurations - a key advantage over many CMOS rail-to-rail op amps that require external compensation for such loads.
How do I adjust the input offset voltage of MAX495EPA+?
MAX495EPA+ provides two dedicated NULL pins (pins 1 and 5) for external offset trimming. Connect a 10kΩ potentiometer between these pins, with its wiper tied to VEE (pin 4). This configuration allows ±6mV trim range, reducing the typical 200µV offset to near-zero - critical for high-resolution ADC interfaces like the MAX187, where residual offset must stay below half an LSB.
Is MAX495EPA+ still recommended for new designs?
No - Maxim explicitly states MAX495EPA+ is "Not Recommended for New Designs" due to discontinuation of its legacy wafer process. However, Aetrix Electronics maintains active inventory and supply-chain continuity for legacy-support programs, medical retrofits, and industrial maintenance. For new designs, consult Analog Devices' current-generation alternatives such as the MAX44267 or ADA4522-1, which offer enhanced specs and long-term availability.
MAX495EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX495EPA+ FAQ
1.How can I place an order for MAX495EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX495EPA+ 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 MAX495EPA+ reliable?
The price and inventory of MAX495EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX495EPA+ is usually 5 days.
3.What payment methods are accepted for MAX495EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX495EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX495EPA+?
MAX495EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX495EPA+ 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 MAX495EPA+?
For technical support, including MAX495EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX495EPA+ requirements.
6.How does Aetrix verify that MAX495EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX495EPA+ 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 MAX495EPA+ meets industry standards.
7.What is the process for return or replacement of MAX495EPA+?
All MAX495EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX495EPA+, 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 MAX495EPA+ part is unused and in its original packaging.
Return procedure for MAX495EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX495EPA+ Tags
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LM358DT
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MCP6006T-E/OT
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