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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:2,994
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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 front-ends.
For engineers reviewing the MAX495EPA datasheet, MAX495EPA pinout, MAX495EPA application, or MAX495EPA equivalent, key selection criteria include its rail-to-rail common-mode range (VEE to VCC), 1kΩ load drive capability, 25nV/√Hz input voltage noise, µMAX package compatibility, and suitability for low-power ADC buffering and sensor interface circuits.
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 both supply rails, with no phase reversal under overdrive. Its folded-cascode output stage enables rail-to-rail output swing within 50mV of VCC/VEE under 100kΩ load.
It features unity-gain stability, drives >1nF capacitive loads without external compensation, and maintains ≥82dB CMRR and ≥84dB PSRR across –40°C to +85°C. Input bias current is ±25nA typical, and offset voltage tempco is ±2µV/°C - supporting stable DC accuracy in thermally varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply - supports direct operation from Li-ion, alkaline, or regulated low-voltage rails without level-shifting. |
| Quiescent Current | 150µA max per amplifier - enables multi-year battery life in always-on portable sensors and metering devices. |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-aliasing filtering, sensor amplification, and DC-coupled signal chains up to ~50kHz. |
| Input Offset Voltage | 200µV max at +25°C - contributes <0.5 LSB error when buffering a 12-bit ADC with 4.096V reference. |
| Input Voltage Noise | 25nV/√Hz - preserves SNR in low-level transducer interfaces (e.g., thermocouples, strain gauges). |
| Output Swing | Within 50mV of VCC/VEE (RL = 100kΩ) - maximizes dynamic range in 3V systems where headroom is critical. |
| Common-Mode Range | VEE – 0.25V to VCC + 0.25V - allows direct sensing of signals referenced to ground or supply rails without attenuation. |
Pinout & Package
MAX495EPA is supplied in an 8-pin plastic DIP package (0.300" wide), compatible with standard through-hole prototyping and legacy industrial PCBs. Pin assignments follow industry-standard op-amp configuration with dedicated NULL pins for offset trimming.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL1 | Offset null input - connect to wiper of 10kΩ potentiometer for manual input offset adjustment (±6mV trim range). |
| 2 | IN1– | Inverting input - accepts feedback network for inverting configurations; matched source resistance minimizes bias-current-induced offset. |
| 3 | IN1+ | Noninverting input - used in voltage followers and noninverting amplifiers; requires R3 = R1∥R2 for bias current cancellation. |
| 4 | VEE | Negative supply - tied to ground in single-supply operation; must be bypassed with 1µF + 0.1µF ceramic capacitor. |
| 5 | NULL2 | Offset null input - connect to opposite end of same 10kΩ potentiometer as Pin 1; wiper goes to VEE (Pin 4). |
| 6 | OUT | Amplifier output - capable of sourcing/sinking ≥30mA short-circuit current; drives 1kΩ loads with full rail-to-rail swing. |
| 7 | VCC | Positive supply - accepts +2.7V to +6V; internal protection limits absolute max to 7V. |
| 8 | N.C. | No connect - not internally bonded; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 3V systems - e.g., 0–3V sensor output mapped directly to 0–3V ADC input without clipping. |
| 200µV max input offset voltage | Reduces calibration burden in precision measurement; eliminates need for auto-zero circuitry in many portable instrument designs. |
| Drives >1nF capacitive loads | Supports direct connection to ADC sample-and-hold inputs or long cables without external isolation resistors or stability compromises. |
| 150µA quiescent current | Permits integration into ultra-low-power wake-up circuits - e.g., op-amp remains active while microcontroller sleeps between sensor reads. |
| Offset null pins (1 & 5) | Allows field-trimmed DC accuracy in production test; unique to MAX495 among MAX492/MAX494 family - dual/quad variants lack this capability. |
Applications
| Portable Equipment | Battery-Powered Instruments |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-range thermocouple or shunt voltage signals. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail input enabling full 0–3V measurement range from single 3.6V Li-ion cell. Use Value: 200µV offset ensures <0.1% reading error at 200mV scale; 150µA current extends battery life to >500 hours continuous use. | Use Scenario: Portable gas detector conditioning electrochemical sensor output (sub-µA current, mV-level voltage). IC Role / Device Role / Timing Role: Transimpedance amplifier with rail-to-rail output driving low-power SAR ADC. Use Value: 25nV/√Hz noise floor preserves resolution down to 10ppm gas concentration; 500kHz GBW supports fast response to transient events. |
| Data Acquisition | Signal Conditioning |
Use Scenario: Multi-channel industrial data logger using MAX187 12-bit ADC with internal 4.096V reference. IC Role / Device Role / Timing Role: Gain-of-two buffer isolating sensor from ADC input capacitance while scaling 0–2.048V to 0–4.096V full scale. Use Value: 400µV total offset error (<0.5 LSB) meets 12-bit linearity requirements; µMAX-compatible footprint allows compact channel density. | Use Scenario: Low-noise preamplifier for piezoelectric vibration sensor in predictive maintenance edge node. IC Role / Device Role / Timing Role: AC-coupled high-input-impedance amplifier with selectable gain, driving anti-alias filter before ADC. Use Value: Rail-to-rail output swing ensures maximum SNR utilization of ADC's dynamic range; 1kΩ drive capability supports RC filter design without gain loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461CDR | Higher quiescent current (550µA), lower GBW (6.4MHz), no offset null pins, SO-8 only. | Not suitable for ultra-low-power designs; lacks manual offset trim for high-accuracy calibration. | Select if higher speed is required and power budget allows; verify layout for stability with capacitive loads. |
| OPA344UA | Lower quiescent current (45µA), lower GBW (1MHz), rail-to-rail I/O, SO-8 only, no null pins. | Superior power efficiency but insufficient GBW for fast-settling data acquisition; no offset adjustment. | Prefer for longest battery life in slow-sampling applications; confirm 1MHz GBW meets system bandwidth needs. |
Compared with TLV2461CDR and OPA344UA, the MAX495EPA uniquely balances micropower operation (150µA), usable bandwidth (500kHz), and factory-trimmable offset - making it irreplaceable in legacy portable instruments requiring recalibration traceability and DIP-package serviceability.
Availability
MAX495EPA is available at Aetrix Electronics and suitable for portable equipment, battery-powered instrumentation, and industrial data acquisition systems requiring stable component supply and long-term obsolescence management.
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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX492/MAX494/MAX495 family was designed specifically for micropower, rail-to-rail precision amplification in space- and energy-constrained portable systems - emphasizing DC accuracy, low-voltage operation, and robustness against overdrive conditions.
FAQ
Is MAX495EPA recommended for new designs?
No - Maxim explicitly states MAX495EPA is "Not Recommended for New Designs" due to discontinuation of the wafer process. It remains available for existing designs and legacy repair, but new projects should evaluate modern alternatives like TLV2461 or OPA344. Aetrix Electronics maintains inventory for continuity support and offers technical guidance on migration paths for the MAX495EPA.
What is the operating temperature range of MAX495EPA?
The MAX495EPA is rated for –40°C to +85°C operation (industrial grade). This is confirmed by the "E" suffix in the part number and verified in the Absolute Maximum Ratings and DC Electrical Characteristics tables across that full range. Performance parameters such as input offset voltage (±950µV max), CMRR (≥68dB), and supply current (≤200µA) are guaranteed within this envelope.
Does MAX495EPA support single-supply operation?
Yes - MAX495EPA is explicitly designed for single-supply operation from +2.7V to +6V, with rail-to-rail input common-mode range (VEE to VCC) and rail-to-rail output swing. Its architecture eliminates the need for split supplies in most portable applications, simplifying power design and reducing component count compared to traditional op-amps.
Can MAX495EPA drive large capacitive loads?
Yes - MAX495EPA can drive capacitive loads exceeding 1nF without external compensation, as documented in Figure 5 (capacitive-load stable region) and Figure 6 (1000pF load test). Stability is maintained up to 400pF when sourcing ~100µA; with 1000pF pure capacitance and no resistive load, it remains stable per typical operating characteristics.
What is the purpose of the NULL pins on MAX495EPA?
The NULL pins (Pins 1 and 5) on MAX495EPA enable manual input offset voltage trimming via an external 10kΩ potentiometer (wiper to VEE). This feature - unique to the single MAX495 among the family - allows adjustment of up to ±6mV offset, critical for achieving sub-LSB accuracy in high-resolution data acquisition systems where factory-trimmed offset alone may be insufficient.
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.
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