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Analog Devices Inc./Maxim Integrated MAX492EPA
- Part No.:
- MAX492EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX492EPA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,994
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Product details
Overview
MAX492EPA from Maxim Integrated is a dual, micropower, single-supply rail-to-rail operational amplifier optimized for low-voltage battery-powered systems. It operates from +2.7V to +6V (or ±1.35V to ±3V), delivers 500kHz gain-bandwidth, draws ≤150µA per amplifier, and achieves rail-to-rail input common-mode range (VEE to VCC) and output swing (within 50mV of rails into 100kΩ). It is used in portable instrumentation signal conditioning where precision, ultra-low quiescent current, and wide dynamic range are critical.
For engineers reviewing the MAX492EPA datasheet, MAX492EPA pinout, MAX492EPA application, or MAX492EPA equivalent, this page provides verified technical context, exact pin functions, real-world use cases in low-voltage data acquisition, and validated alternative options - all grounded in the official MAX492/MAX494/MAX495 family datasheet (Rev 2, 9/96).
Technical Context
The MAX492EPA employs complementary NPN/PNP input stages enabling true rail-to-rail input common-mode voltage (VEE to VCC) without phase reversal, with a widened 600mV transition region to minimize CMRR degradation. Its folded-cascode architecture supports unity-gain stability and drives ≥1kΩ loads while maintaining DC accuracy.
It features internal back-to-back diode protection (±0.7V differential limit) and 1.7kΩ series resistors at inputs, defining safe operating limits for overvoltage conditions. Output stability extends to >1nF capacitive loads, with guaranteed stability up to 400pF when sourcing ~100µA - a key differentiator versus standard CMOS rail-to-rail op amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V (single supply); enables direct operation from Li-ion, 3.3V, or 5V rails without level-shifting. |
| Quiescent Current | 150µA per amplifier max (at +25°C); allows multi-day battery life in always-on sensor front-ends. |
| Input Offset Voltage | ±200µV max (TYP), ±500µV max (0°C to +70°C); ensures <0.5 LSB error when buffering 12-bit ADCs like MAX187. |
| Gain-Bandwidth Product | 500kHz; supports stable closed-loop gain up to 100× at 5kHz for anti-aliasing or sensor amplification. |
| Output Voltage Swing | Within 50mV of VCC/VEE into 100kΩ; preserves >98% of available dynamic range at 3V supply. |
| CMRR / PSRR | 90dB / 110dB (TYP); rejects supply noise and common-mode interference in noisy embedded environments. |
| Input Noise Density | 25nV/√Hz; maintains signal integrity in low-level thermocouple or bridge sensor interfaces. |
Pinout & Package
MAX492EPA is supplied in an 8-pin plastic DIP package (0.300" wide), with pin 1 designated as OUT1 and pin 4 as VEE (ground/negative supply). All pins match industry-standard dual op-amp pinout (SO-8/DIP-8), ensuring drop-in compatibility with legacy designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output; connects directly to downstream ADC input or filter network. |
| 2 | IN1− | Inverting input of Amp 1; requires matched source impedance to IN1+ to minimize bias-current offset. |
| 3 | IN1+ | Noninverting input of Amp 1; accepts signals from VEE to VCC with no phase reversal. |
| 4 | VEE | Negative supply pin; tied to GND in single-supply mode; must be bypassed with 1µF + 0.1µF ceramic. |
| 5 | IN2+ | Noninverting input of Amp 2; electrically identical to IN1+, supports independent dual-channel operation. |
| 6 | IN2− | Inverting input of Amp 2; shares same protection and bias characteristics as IN1−. |
| 7 | OUT2 | Amplifier 2 output; usable for differential drive, active filtering, or dual-sensor conditioning. |
| 8 | VCC | Positive supply pin; accepts +2.7V to +6V; requires local decoupling for noise-sensitive applications. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25V beyond VEE and VCC, enabling direct interface to sensors operating at supply rails. |
| No phase reversal on overdrive | Guaranteed non-latching behavior even when inputs exceed VEE/VCC - critical for fault-tolerant monitoring. |
| Capacitive load drive capability | Stable with >1nF loads; eliminates need for external isolation resistors in most data-acquisition buffers. |
| Low input bias current | ±25nA typical; minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes). |
| High large-signal voltage gain | 108dB typical; ensures <0.001% gain error in precision gain stages at room temperature. |
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: Dual-channel rail-to-rail buffer and gain stage, rejecting electrode motion artifacts while preserving DC baseline. Use Value: 150µA per amplifier enables >1 week continuous operation; rail-to-rail input captures full sensor swing without clipping. |
Use Scenario: Conditioning thermistor and humidity sensor outputs in remote environmental monitors running on AA batteries. IC Role / Device Role / Timing Role: Low-drift signal conditioner driving SAR ADCs during periodic wake-up cycles. Use Value: ±200µV offset ensures <0.1°C measurement error; 500kHz GBW supports fast settling after power-up. |
| Low-Voltage Industrial I/O Modules | Single-Supply Precision Instrumentation |
Use Scenario: Scaling 4–20mA loop signals to 0–3.3V for microcontroller ADCs in factory-floor PLC add-on modules. IC Role / Device Role / Timing Role: Current-to-voltage converter and level-shifter operating from unregulated 5V rail. Use Value: Rail-to-rail output delivers full 0–3.3V range; 110dB PSRR suppresses switching noise from adjacent DC/DC converters. |
Use Scenario: Buffering reference voltages and sensor bridges in handheld multimeters and calibrators. IC Role / Device Role / Timing Role: High-accuracy unity-gain follower isolating reference sources from load variations. Use Value: 90dB CMRR rejects common-mode noise from shared ground paths; 25nV/√Hz noise avoids degrading 16-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2462IDR | Higher quiescent current (550µA vs. 150µA); wider supply range (2.7V–6V same); lower offset (±150µV typ). | Better DC precision but 3.7× higher supply current; less suitable for multi-year battery life. | Choose TLV2462IDR when offset and drift dominate over power; avoid if >200µA total system budget. |
| AD8602ARZ | Lower noise (12nV/√Hz vs. 25nV/√Hz); higher GBW (10MHz vs. 500kHz); higher supply current (1.2mA vs. 150µA). | Superior AC performance and noise floor, but incompatible with micropower architectures. | Choose AD8602ARZ for high-speed sensor interfaces requiring bandwidth >100kHz; not viable for sub-200µA systems. |
Compared with TLV2462IDR and AD8602ARZ, the MAX492EPA uniquely balances rail-to-rail operation, sub-200µA quiescent current, and 500kHz bandwidth - making it irreplaceable in long-life, low-voltage, precision analog front-ends where power and dynamic range are co-constrained.
Availability
MAX492EPA is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and low-voltage industrial I/O modules requiring stable component supply and long-term design continuity.
Supply support for MAX492EPA 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 and mixed-signal ICs for power, sensing, and communication applications.
The MAX492/MAX494/MAX495 family was designed specifically for micropower, single-supply, rail-to-rail signal conditioning in space- and energy-constrained portable and industrial systems.
FAQ
Is MAX492EPA recommended for new designs?
No - Maxim explicitly states "Not Recommended for New Designs" due to discontinuation of the wafer process. The MAX492EPA remains available for existing designs and legacy repair, but new projects should evaluate alternatives like TLV2462IDR or AD8602ARZ with engineering validation. MAX492EPA datasheet Rev 2 (9/96) is maintained for reference only.
What is the operating temperature range of MAX492EPA?
The MAX492EPA is rated for −40°C to +85°C, as indicated by the "E" suffix in its ordering code. This extended industrial temperature grade ensures reliable operation in outdoor data loggers, automotive cabin sensors, and factory-floor equipment where ambient temperatures exceed commercial-grade limits.
Does MAX492EPA support single-supply operation?
Yes - the MAX492EPA 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. It requires no dual supplies; VEE is connected to ground, and VCC receives the positive rail - ideal for battery-powered systems.
Can MAX492EPA drive capacitive loads without oscillation?
Yes - the MAX492EPA is characterized for stable operation with >1nF capacitive loads. It remains stable up to 400pF when sourcing ~100µA, and handles 1000pF pure capacitance (RL = ∞) without external compensation - a key advantage over many CMOS rail-to-rail op amps that require isolation resistors.
What is the function of the NULL pins on MAX492EPA?
The MAX492EPA does not have NULL pins. Only the single MAX495 variant includes NULL1 and NULL2 pins (pins 1 and 5) for external offset trimming. The dual MAX492EPA (and quad MAX494) lack offset-null capability - its input offset voltage is factory-trimmed to ±200µV (typ) and cannot be adjusted externally.
MAX492EPA 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:
- 2
- 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 (x2 Channels)
- 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
MAX492EPA FAQ
1.How can I place an order for MAX492EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX492EPA 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 MAX492EPA reliable?
The price and inventory of MAX492EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX492EPA is usually 5 days.
3.What payment methods are accepted for MAX492EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX492EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX492EPA?
MAX492EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX492EPA 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 MAX492EPA?
For technical support, including MAX492EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX492EPA requirements.
6.How does Aetrix verify that MAX492EPA is sourced from the original manufacturer or authorized distributors?
All MAX492EPA 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 MAX492EPA meets industry standards.
7.What is the process for return or replacement of MAX492EPA?
All MAX492EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX492EPA, 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 MAX492EPA part is unused and in its original packaging.
Return procedure for MAX492EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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