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Analog Devices Inc./Maxim Integrated MAX495CPA
- Part No.:
- MAX495CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX495CPA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,613
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Product details
Overview
MAX495CPA 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 - enabling precision signal conditioning in portable instrumentation and data acquisition front-ends.
For engineers reviewing the MAX495CPA datasheet, MAX495CPA pinout, MAX495CPA application, or MAX495CPA equivalent, this page provides verified technical context, confirmed pin functions, real-world use cases in low-voltage analog signal chains, and validated alternative options for continuity planning where MAX495CPA is no longer recommended for new designs.
Technical Context
The MAX495CPA employs 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 supports unity-gain stability while maintaining 108dB large-signal voltage gain and 90dB CMRR at +25°C.
It features internal back-to-back diode protection on inputs, no phase reversal under overdrive, and stable operation driving ≥1nF capacitive loads - enabled by low-output-impedance design and optimized compensation. Offset null pins (1 and 5) allow external trimming to ±6mV, a capability unique to the MAX495 within the family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply - enables direct interface with Li-ion, alkaline, or regulated 3.3V/5V rails without level-shifting. |
| Quiescent Current | 150µA max per amplifier - extends battery life in always-on sensor nodes and portable meters. |
| Gain-Bandwidth Product | 500kHz - supports DC-coupled amplification of audio-band and slow control-loop signals with minimal phase lag. |
| Input Offset Voltage | 200µV max at +25°C - contributes <0.5 LSB error when buffering a 12-bit ADC with 4.096V reference. |
| Output Swing | Within 50mV of VEE/VCC into 100kΩ - maximizes dynamic range in 3V systems, preserving >96% of full-scale signal amplitude. |
| CMRR / PSRR | 90dB / 110dB - rejects power-supply ripple and common-mode noise in noisy embedded environments. |
| Input Noise Density | 25nV/√Hz at 1kHz - suitable for low-level transducer amplification without dominating system noise floor. |
Pinout & Package
MAX495CPA is supplied in an 8-pin plastic DIP package (0.300" wide), with through-hole mounting and industry-standard op-amp pinout compatible with legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Offset null input - connect to wiper of 10kΩ potentiometer for manual input offset trimming. |
| 2 | IN1− | Inverting input - accepts differential signal referenced to noninverting input; protected by internal 1.7kΩ series resistors and back-to-back diodes. |
| 3 | IN1+ | Noninverting input - same protection as IN1−; bias current flows in/out depending on active input stage (NPN/PNP). |
| 4 | VEE | Negative supply pin - connects to ground in single-supply mode; supports split-supply operation down to −3V. |
| 5 | NULL | Offset null input - other end of trim potentiometer; tied to VEE for balanced nulling circuit. |
| 6 | OUT | Amplifier output - rail-to-rail capable; drives ≥1kΩ resistive loads and ≥1nF capacitive loads without oscillation. |
| 7 | VCC | Positive supply pin - accepts +2.7V to +6V; requires 1µF + 0.1µF bypassing for stable operation. |
| 8 | N.C. | No connect - not internally bonded; must remain unconnected in PCB layout. |
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 without external level shifters. |
| Rail-to-rail output swing | Within 50mV of VEE/VCC into 100kΩ - preserves maximum signal headroom in low-voltage systems. |
| Unity-gain stable | No external compensation required - simplifies design of buffers, followers, and gain-of-one configurations. |
| Capacitive-load drive capability | Stable with ≥1000pF pure capacitance - eliminates need for isolation resistors in most sensor interface applications. |
| Offset null pins | Pins 1 and 5 support external trimming to ±6mV - enables calibration of precision measurement paths without replacing IC. |
| No phase reversal on overdrive | Guaranteed behavior across full common-mode range - prevents latch-up or erroneous output states during transient overload. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying microvolt-level ECG or thermistor signals in handheld vital sign monitors powered by two AA cells. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage preceding 12-bit SAR ADC. Use Value: 200µV offset and 25nV/√Hz noise ensure sub-LSB error contribution; 150µA quiescent current extends runtime beyond 100 hours per battery set. |
Use Scenario: Conditioning analog outputs from environmental sensors (humidity, pressure) in solar-charged remote telemetry units. IC Role / Device Role / Timing Role: Rail-to-rail input/output signal conditioner interfacing sensors to low-power MCU ADCs. Use Value: Full 0–3.3V dynamic range utilization from 3.3V supply; ability to drive 1nF cable capacitance avoids signal distortion over 10m interconnects. |
| Low-Voltage Industrial Transmitters | Portable Test Equipment Front-Ends |
Use Scenario: Signal conditioning for 4–20mA loop-powered field transmitters operating from 12V supply with tight thermal constraints. IC Role / Device Role / Timing Role: High-PSRR (110dB) amplifier rejecting supply ripple in unregulated loop power. Use Value: 110dB PSRR suppresses 120Hz ripple to <1µV at output; rail-to-rail output ensures full DAC code utilization in 16-bit output stages. |
Use Scenario: Input buffer for handheld multimeters and oscilloscope probes requiring high-Z, low-noise, and fast settling. IC Role / Device Role / Timing Role: Unity-gain follower isolating high-impedance probe tip from downstream ADC and multiplexer. Use Value: 4µs power-up settling (3V) enables rapid wake-from-sleep measurements; no phase reversal prevents false readings during input overrange events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX44260ASA+ | Lower 12µV offset, 1.5MHz GBW, 1.2µA IQ - higher performance but 8× higher supply current. | Not pin-compatible; requires PCB redesign. Better for precision DC apps where power budget allows. | Select when offset drift and bandwidth outweigh battery-life concerns; verify layout compatibility with SO-8 footprint. |
| MCP6001T-E/OT | 250µV offset, 1MHz GBW, 100µA IQ - lower cost, wider temp range (−40°C to +125°C), no offset null pins. | Pin-compatible SO-8 variant exists; DIP version unavailable. Lacks nulling capability and has higher noise (30nV/√Hz). | Preferred for new designs needing drop-in replacement in SO-8; use only where 250µV offset and absence of trimming are acceptable. |
Compared with MAX495CPA, MAX44260ASA+ offers superior DC accuracy and speed at significantly higher quiescent current, while MCP6001T-E/OT provides cost-effective, widely available pin-compatible operation in SO-8 with relaxed offset and no trimming - making it suitable for volume production where legacy DIP support is not required.
Availability
MAX495CPA is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and low-voltage industrial transmitters requiring stable component supply and legacy design continuity.
Supply support for MAX495CPA 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 MAX495CPA belongs to Maxim's micropower rail-to-rail op amp family, designed specifically for ultra-low-power, precision analog signal conditioning in space- and energy-constrained portable and battery-operated equipment.
FAQ
What is the operating temperature range for MAX495CPA?
The MAX495CPA is specified for 0°C to +70°C ambient operation (C-grade). This range is confirmed in the Ordering Information table and applies to all electrical characteristics unless otherwise noted. The device uses a plastic DIP package rated for this commercial temperature range, and derating curves for power dissipation are provided for operation above +70°C.
Does MAX495CPA support single-supply operation?
Yes, MAX495CPA fully supports single-supply operation from +2.7V to +6V. Its rail-to-rail input common-mode range extends from VEE − 0.25V to VCC + 0.25V, and its output swings within 50mV of both rails into 100kΩ - enabling true DC-coupled functionality without level-shifting circuitry when powered from a single positive rail.
Can MAX495CPA drive capacitive loads, and how much?
Yes, MAX495CPA is explicitly characterized for stable operation with capacitive loads ≥1nF. Figure 5 in the datasheet confirms stability with up to 1000pF pure capacitance, and Figures 6–7 demonstrate clean transient response with 500pF–1000pF loads under various resistive conditions - a key differentiator versus many competing micropower op amps.
Is MAX495CPA pin-compatible with other op amps in the MAX49x family?
MAX495CPA shares the same 8-pin DIP/SO pinout as the dual MAX492 and quad MAX494 for pins 1–4 and 6–8, but differs critically: MAX495CPA has N.C. on pin 8 and NULL pins on 1 and 5, whereas MAX492 uses pins 1 and 5 for OUT1 and IN2−. Therefore, it is not functionally or pin-compatible with MAX492/MAX494 in socketed designs.
Why is MAX495CPA marked "Not Recommended for New Designs"?
MAX495CPA is marked "Not Recommended for New Designs" because its fabrication process at an external wafer foundry has been discontinued. Maxim states the process is no longer available, making long-term supply uncertain. While existing stock remains available and the datasheet is maintained for legacy support, new designs should consider alternatives like MCP6001T-E/OT or MAX44260ASA+.
MAX495CPA 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX495CPA FAQ
1.How can I place an order for MAX495CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX495CPA 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 MAX495CPA reliable?
The price and inventory of MAX495CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX495CPA is usually 5 days.
3.What payment methods are accepted for MAX495CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX495CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX495CPA?
MAX495CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX495CPA 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 MAX495CPA?
For technical support, including MAX495CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX495CPA requirements.
6.How does Aetrix verify that MAX495CPA is sourced from the original manufacturer or authorized distributors?
All MAX495CPA 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 MAX495CPA meets industry standards.
7.What is the process for return or replacement of MAX495CPA?
All MAX495CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX495CPA, 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 MAX495CPA part is unused and in its original packaging.
Return procedure for MAX495CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX495CPA Tags
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