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Analog Devices Inc./Maxim Integrated MAX495CSA+T
- Part No.:
- MAX495CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX495CSA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
MAX495CSA+T 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 MAX495CSA+T datasheet, MAX495CSA+T pinout, MAX495CSA+T application, or MAX495CSA+T 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, 25nV/√Hz input voltage noise, and µMAX package compatibility with space-constrained PCB layouts.
Technical Context
The MAX495CSA+T employs dual complementary input stages (NPN and PNP) operating in parallel 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 output stage enables rail-to-rail output swing while maintaining DC accuracy under load.
It features internal back-to-back diode protection between IN+ and IN− with 1.7kΩ series resistors, limiting differential input voltage to ~0.7V. The device drives ≥1nF capacitive loads stably without external isolation resistors and supports offset trimming via dedicated NULL pins (1 and 5) referenced to VEE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply - enables direct integration with Li-ion, Li-poly, or two-cell alkaline battery systems without regulation. |
| Quiescent Current | ≤150µA per amplifier - extends battery life in always-on sensor front-ends and portable data loggers. |
| Input Offset Voltage | 200µV (max at +25°C) - contributes <0.5 LSB error when buffering a 12-bit ADC with 4.096V reference. |
| Gain-Bandwidth Product | 500kHz - supports anti-aliasing filtering and sensor signal amplification up to ~50kHz at unity gain. |
| Input Voltage Noise | 25nV/√Hz at 1kHz - preserves SNR in low-level thermocouple or bridge sensor interfaces. |
| Output Swing | Within 50mV of VEE and VCC into 100kΩ - maximizes dynamic range in 3V systems where full 0–3V output is required. |
| CMRR / PSRR | 90dB / 110dB - rejects supply ripple and common-mode interference in noisy industrial or automotive environments. |
Pinout & Package
MAX495CSA+T is housed in an 8-pin µMAX package (3.0mm × 3.0mm, 0.8mm height), pin-compatible with industry-standard SO-8 but with 50% smaller footprint. The package uses fine-pitch leads (0.5mm pitch) and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Offset null input - connects to one end of 10kΩ trim potentiometer for manual input offset correction. |
| 2 | IN1− | Inverting input - accepts feedback network in inverting amplifier configurations; matched impedance critical for bias current cancellation. |
| 3 | IN1+ | Noninverting input - high-impedance node requiring short trace routing to minimize pickup; bias current flows in/out depending on common-mode voltage. |
| 4 | VEE | Negative power supply - tied to ground in single-supply operation; substrate connection point for ESD robustness. |
| 5 | NULL | Offset null input - connects to other end of 10kΩ trim potentiometer; wiper tied to VEE completes trimming circuit. |
| 6 | OUT | Amplifier output - capable of sourcing/sinking ≥30mA short-circuit current; stable driving ≥1nF capacitive loads without isolation resistor. |
| 7 | VCC | Positive power supply - requires local 1µF + 0.1µF ceramic bypassing; supplies all internal bias and output stages. |
| 8 | N.C. | No connect - not internally bonded; must remain unconnected to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25V beyond VEE and VCC - eliminates level-shifting circuits when interfacing with sensors operating near supply rails. |
| Rail-to-rail output swing | Within 50mV of VEE/VCC into 100kΩ - preserves full-scale resolution in low-voltage ADC driver applications. |
| Unity-gain stable | No external compensation required - simplifies design of buffers, active filters, and gain-of-one signal conditioners. |
| Offset voltage trimming | Dedicated NULL pins (1 and 5) support ±6mV adjustment range - enables calibration to sub-LSB error in precision measurement systems. |
| Capacitive-load drive capability | Stable with >1nF pure capacitance - eliminates need for output isolation resistors in ADC input buffers and piezo sensor interfaces. |
| No phase reversal on overdrive | Guaranteed behavior beyond common-mode range - prevents latch-up or erroneous output states during transient input excursions. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying microvolt-level ECG or EEG signals in handheld diagnostic devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with rail-to-rail input to capture baseline shifts and low-frequency waveforms. Use Value: 200µV offset and 25nV/√Hz noise ensure detection of <10µV physiological signals; 150µA quiescent current enables multi-week operation on CR2032. |
Use Scenario: Conditioning thermistor, RTD, or humidity sensor outputs in field-deployed environmental monitors. IC Role / Device Role / Timing Role: Low-drift, low-power signal buffer and anti-aliasing filter driver for 12-bit SAR ADCs sampling at 1–10Hz. Use Value: Rail-to-rail output swing maximizes ADC utilization across 2.7–3.6V battery range; 500kHz GBW supports 100Hz filter cutoffs with margin. |
| Low-Voltage Industrial Transmitters | Portable Test Equipment |
Use Scenario: Driving 4–20mA loop transmitters or isolated analog outputs in battery-backed process controllers. IC Role / Device Role / Timing Role: Output buffer and level translator ensuring accurate current-source control despite varying supply voltage. Use Value: CMRR ≥90dB rejects supply noise in shared PCB power domains; output swing to within 50mV of rails maintains linearity down to 2.7V operation. |
Use Scenario: Input stage for handheld multimeters or oscilloscope probes measuring signals from mV to 3V full-scale. IC Role / Device Role / Timing Role: High-input-impedance, low-noise amplifier with calibrated offset for auto-zeroed DC measurements. Use Value: NULL-pin trimming enables factory calibration to <50µV residual offset; 110dB PSRR suppresses switching regulator noise in mixed-signal test platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461CDR | Higher quiescent current (550µA), lower GBW (6.4MHz), no NULL pins, SO-8 only | Better AC performance but unsuitable for ultra-low-power or precision offset-trimmed designs | Select TLV2461CDR only if bandwidth >1MHz is required and battery life is secondary |
| MCP6001T-E/OT | Lower quiescent current (100µA), lower GBW (1MHz), no rail-to-rail input, SOT-23-5 package | Smaller footprint and lower power, but limited input range (VEE+0.3V to VCC-0.1V) restricts use with rail-stacked sensors | Select MCP6001T-E/OT for space-constrained, non-rail-to-rail applications where input common-mode range is not critical |
Compared with TLV2461CDR and MCP6001T-E/OT, MAX495CSA+T uniquely combines rail-to-rail input *and* output, factory-trimmable offset, and sub-150µA quiescent current - making it irreplaceable in battery-powered precision analog front-ends requiring full dynamic range utilization at 3V.
Availability
MAX495CSA+T 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 long-term obsolescence management.
Supply support for MAX495CSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX495CSA+T belongs to the MAX492/MAX494/MAX495 family of micropower rail-to-rail op amps, designed specifically for precision, low-voltage signal conditioning in battery-operated equipment where DC accuracy, dynamic range, and ultra-low power are co-critical.
FAQ
Is MAX495CSA+T recommended for new designs?
No - Maxim explicitly states MAX495CSA+T is "Not Recommended for New Designs" due to discontinuation of its legacy wafer process. While functional and supported for existing designs, Aetrix recommends evaluating pin-compatible alternatives like MAX44260 or AD8605 for new projects requiring long-term supply assurance and modern process benefits.
What is the function of the NULL pins on MAX495CSA+T?
The NULL pins (1 and 5) on MAX495CSA+T enable external trimming of input offset voltage using a 10kΩ potentiometer wired between them, with the wiper connected to VEE (pin 4). This circuit provides ±6mV adjustment range, allowing calibration of the MAX495CSA+T's 200µV typical offset to sub-50µV levels in precision measurement systems.
Can MAX495CSA+T drive large capacitive loads without oscillation?
Yes - MAX495CSA+T is characterized to drive >1nF capacitive loads stably. Its internal compensation supports 1000pF pure capacitance with no isolation resistor, and up to 400pF when sourcing ~100µA. For 10,000pF loads, a 47Ω series isolation resistor (RS) restores phase margin, as verified in Figure 9b of the datasheet.
What is the maximum operating temperature range for MAX495CSA+T?
The MAX495CSA+T is specified for the commercial temperature range of 0°C to +70°C. This is confirmed by its ordering suffix 'C' (MAX495Cxx), distinct from extended-range variants like MAX495E (–40°C to +85°C) or MAX495M (–55°C to +125°C), which use different package markings and test screening.
How does the rail-to-rail input stage of MAX495CSA+T avoid phase reversal?
MAX495CSA+T uses parallel NPN and PNP input stages with overlapping activation regions, eliminating the dead zone where conventional rail-to-rail op amps invert output polarity. Even when common-mode voltage exceeds VEE or VCC by 0.25V, the device guarantees no phase reversal or latch-up - a critical feature for sensor interfaces experiencing transient overvoltage.
MAX495CSA+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:
- 0.2V/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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX495CSA+T FAQ
1.How can I place an order for MAX495CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX495CSA+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 MAX495CSA+T reliable?
The price and inventory of MAX495CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX495CSA+T is usually 5 days.
3.What payment methods are accepted for MAX495CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX495CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX495CSA+T?
MAX495CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX495CSA+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 MAX495CSA+T?
For technical support, including MAX495CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX495CSA+T requirements.
6.How does Aetrix verify that MAX495CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX495CSA+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 MAX495CSA+T meets industry standards.
7.What is the process for return or replacement of MAX495CSA+T?
All MAX495CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX495CSA+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 MAX495CSA+T part is unused and in its original packaging.
Return procedure for MAX495CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX495CSA+T Tags
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