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Analog Devices Inc./Maxim Integrated MAX495CSA
- Part No.:
- MAX495CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX495CSA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,314
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Product details
Overview
MAX495CSA 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 front-ends.
For engineers reviewing the MAX495CSA datasheet, MAX495CSA pinout, MAX495CSA application, or MAX495CSA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated µMAX package pin mapping, confirmed rail-to-rail dynamic range behavior, and two industry-validated alternative op amps with documented functional trade-offs.
Technical Context
The MAX495CSA uses a complementary bipolar input stage (NPN + PNP) to achieve rail-to-rail common-mode input 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 within 50mV of both rails under 100kΩ load.
It features unity-gain stability, drives ≥1nF capacitive loads without external compensation, and maintains >72dB CMRR and >100dB PSRR across 0°C to +70°C - critical for low-noise, high-accuracy analog signal chains where supply rejection and common-mode immunity directly impact measurement fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply - supports direct integration with Li-ion, alkaline, or regulated 3.3V/5V rails without level-shifting. |
| Quiescent Current | ≤150µA per amplifier - enables multi-day operation in coin-cell–powered sensors and portable meters. |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-aliasing filters, sensor amplification, and ADC driver stages up to ~50kHz signals. |
| Input Offset Voltage | 200µV (max at +25°C) - contributes <0.5 LSB error when driving a 12-bit ADC with 4.096V reference. |
| Output Voltage Swing | Within 50mV of VEE and VCC (RL = 100kΩ) - maximizes usable dynamic range in low-voltage systems (e.g., 3V supply → 2.95Vpp output). |
| Input Noise Density | 25nV/√Hz - ensures minimal added noise in precision DC-coupled amplifiers for thermocouple or bridge sensor interfaces. |
| CMRR / PSRR | 90dB / 110dB (typical) - rejects power-supply ripple and common-mode interference in noisy industrial or automotive environments. |
Pinout & Package
MAX495CSA is packaged in an 8-pin µMAX (SO-8 variant), 3.0mm × 3.0mm body, 0.5mm pitch, exposed pad for thermal enhancement - identical footprint to industry-standard SO-8 but with 40% smaller area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Offset null input - connect wiper of 10kΩ pot to VEE (pin 4) to trim input offset voltage (±6mV range). |
| 2 | IN1− | Inverting input - accepts differential signals; internal protection diodes limit differential input voltage to ±0.7V. |
| 3 | IN1+ | Noninverting input - rail-to-rail common-mode range (VEE − 0.25V to VCC + 0.25V) enables direct sensing at supply rails. |
| 4 | VEE | Negative supply pin - connect to ground (single supply) or negative rail (dual supply); substrate tied to VEE. |
| 5 | NULL | Offset null input - second terminal of offset trim network; unused pins must remain unconnected. |
| 6 | OUT | Amplifier output - rail-to-rail swing (sourcing/sinking), stable driving ≥1nF capacitive loads without isolation resistor. |
| 7 | VCC | Positive supply pin - bypass with 1µF + 0.1µF ceramic capacitors close to pin for low-noise operation. |
| 8 | N.C. | No connect - not internally bonded; must be left floating (not tied to VCC, VEE, or ground). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25V beyond VEE and VCC - eliminates need for level-shifting in single-supply sensor interfaces. |
| Rail-to-rail output swing | Within 50mV of both rails (100kΩ load) - preserves full-scale resolution in low-voltage ADC drivers. |
| No phase reversal on overdrive | Guaranteed operation even when inputs exceed supply rails - prevents latch-up in transient-prone industrial I/O. |
| Capacitive-load drive capability | Stable with >1nF pure capacitance - simplifies anti-aliasing filter design without external isolation resistors. |
| Offset voltage trimming | External 10kΩ pot between pins 1/5 and VEE adjusts offset by ±6mV - enables calibration for <10µV residual error. |
| Low input bias current | ±25nA typical - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes). |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying microvolt-level ECG or temperature sensor outputs in handheld diagnostic devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail input enabling direct connection to sensor bridges and thermistors referenced to ground. Use Value: 150µA quiescent current extends battery life to >1 year; 200µV offset ensures sub-LSB error into 12-bit ADCs. |
Use Scenario: Conditioning analog outputs from environmental sensors (humidity, pressure) in solar-charged remote monitoring nodes. IC Role / Device Role / Timing Role: Low-power signal conditioner buffering sensor outputs before multiplexing and digitization. Use Value: Single +3.3V operation eliminates auxiliary supplies; rail-to-rail output maximizes dynamic range for variable-gain front-ends. |
| Industrial 4–20mA Loop Receivers | Low-Voltage ADC Driver Circuits |
Use Scenario: Converting 4–20mA loop current to voltage in space-constrained PLC I/O modules operating from 5V rails. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with high PSRR rejecting loop supply noise. Use Value: 110dB PSRR suppresses 50/60Hz line noise; 500kHz GBW supports fast step response for process control feedback. |
Use Scenario: Driving the analog input of MAX187 12-bit ADC in portable multimeters using shared 5V supply. IC Role / Device Role / Timing Role: Gain-of-two buffer isolating ADC input from source impedance variations. Use Value: Output swing to within 50mV of rails ensures full 0–4.096V reference utilization; 25nV/√Hz noise avoids degrading ENOB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461CDR | Higher quiescent current (550µA), lower GBW (6.4MHz), no offset trim pins | Better AC performance but unsuitable for ultra-low-power coin-cell designs | Select when bandwidth >1MHz is required and supply current budget allows ≥3× increase |
| MCP6001T-E/OT | Lower supply current (100µA), lower GBW (1MHz), no rail-to-rail input (CMVR = VSS to VDD − 0.3V) | Cost-optimized for non-critical DC apps; cannot handle input signals near VDD | Select for cost-sensitive, non-precision applications where input stays ≥300mV below VDD |
Compared with TLV2461CDR and MCP6001T-E/OT, the MAX495CSA uniquely combines sub-150µA supply current, true rail-to-rail input *and* output, and user-adjustable offset - making it irreplaceable in battery-powered precision measurement where dynamic range, power, and calibration flexibility are simultaneously constrained.
Availability
MAX495CSA is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial 4–20mA loop receivers requiring stable component supply and long-term obsolescence management.
Supply support for MAX495CSA 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, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX495CSA belongs to the MAX492/MAX494/MAX495 family of micropower rail-to-rail op amps engineered specifically for battery-operated instrumentation and low-voltage signal conditioning where DC accuracy, supply efficiency, and input/output dynamic range are co-critical.
FAQ
What is the operating temperature range for the MAX495CSA?
The MAX495CSA is specified for 0°C to +70°C ambient operation (Commercial grade). Its electrical parameters - including input offset voltage (±650µV max), supply current (≤175µA), and CMRR (≥72dB) - are guaranteed across this full range. For extended temperature applications, the MAX495ESA (-40°C to +85°C) or MAX495MJA (-55°C to +125°C) variants are available, but MAX495CSA itself is rated only to +70°C.
Does the MAX495CSA require external components for stability with capacitive loads?
No, the MAX495CSA is inherently stable driving >1nF capacitive loads without external isolation resistors or compensation networks. Its internal architecture maintains >60° phase margin even with 1000pF pure capacitance (RL = ∞), as verified in Figure 6 of the datasheet. An isolation resistor (e.g., 47Ω) is only recommended for extreme cases like 10,000pF loads - not required for standard anti-aliasing or cable-drive applications.
Can the MAX495CSA operate from a single 3.3V supply?
Yes, the MAX495CSA fully supports +3.3V single-supply operation. Its 2.7V to 6V supply range includes 3.3V, and all key specifications - rail-to-rail input (0V to 3.3V), rail-to-rail output (within 50mV of 0V and 3.3V), 150µA quiescent current, and 500kHz GBW - are valid at this voltage. This makes MAX495CSA ideal for interfacing with 3.3V microcontrollers and ADCs in modern portable systems.
How is input offset voltage trimmed on the MAX495CSA?
The MAX495CSA provides dedicated NULL pins (1 and 5) for external offset trimming. Connect a 10kΩ potentiometer across pins 1 and 5, with its wiper tied to VEE (pin 4). This configuration adjusts input offset voltage over a ±6mV range - sufficient to reduce residual offset to <10µV after calibration. Note: MAX492 and MAX494 lack these pins; only MAX495 supports user trimming.
Is the MAX495CSA pin-compatible with other op amps in the same package?
No - the MAX495CSA's µMAX pinout (N.C. on pin 8, NULL on pins 1/5) is unique to the MAX495 family and not pin-compatible with generic SO-8 op amps like LM358 or TLV2461. Substituting requires PCB layout revision. Pin compatibility exists only within the MAX492/MAX494/MAX495 family (e.g., MAX492CSA uses same 8-pin SO footprint but different pin functions).
MAX495CSA 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX495CSA FAQ
1.How can I place an order for MAX495CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX495CSA 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 reliable?
The price and inventory of MAX495CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX495CSA is usually 5 days.
3.What payment methods are accepted for MAX495CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX495CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX495CSA?
MAX495CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX495CSA 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?
For technical support, including MAX495CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX495CSA requirements.
6.How does Aetrix verify that MAX495CSA is sourced from the original manufacturer or authorized distributors?
All MAX495CSA 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 meets industry standards.
7.What is the process for return or replacement of MAX495CSA?
All MAX495CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX495CSA, 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 part is unused and in its original packaging.
Return procedure for MAX495CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX495CSA Tags
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LM358DT
STMicroelectronics
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LM358DR
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
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