MAX494EPD+ Equivalent & Substitute Parts Reference

Part Overview

The MAX494EPD+ is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, featuring four independent amplifier circuits in a 14-PDIP through-hole package. This device delivers rail-to-rail output capability with a supply voltage range of 2.7V to 6V, making it suitable for low-voltage analog signal processing applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support.

Substiute Parts

MAX494EPD+

Analog Devices Inc./Maxim IntegratedIn Stock: 100482MAX494EPD+ Datasheet

Current PartRFQ

MAX494EPD+

Analog Devices Inc./Maxim IntegratedIn Stock: 100482MAX494EPD+ Datasheet

DirectRFQ

OPA344PA

Burr BrownIn Stock: 4118OPA344PA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX494EPD+ requires evaluation based on the following critical parameters:

Circuit Configuration: The MAX494EPD+ contains four independent amplifier circuits. Direct substitutes must provide equivalent channel count or allow parallel configuration to achieve four-channel functionality.

Output Characteristics: Rail-to-rail output capability is a defining feature. Substitute parts must maintain this specification to ensure full supply voltage utilization.

Supply Voltage Compatibility: The 2.7V to 6V supply range defines the operating envelope. Substitutes must support this range or a compatible subset.

Electrical Performance: Input bias current (25 nA), input offset voltage (200 µV), slew rate (0.2 V/µs), and gain bandwidth product (500 kHz) establish the performance baseline. Substitutes with equal or superior specifications are acceptable.

Package and Mounting: The 14-DIP through-hole package is a mechanical constraint. Substitutes must use identical or pin-compatible packages to ensure direct board-level replacement.

Compliance and Status: RoHS3 compliance and product status affect long-term availability and regulatory acceptability.

The OPA344PA is identified as a substitute candidate based on shared electrical characteristics and compliance profile, though with architectural differences requiring evaluation.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement Consideration: The MAX494EPD+ is classified as obsolete. The OPA344PA is an active product with current manufacturing support, making it suitable for applications requiring long-term component availability.

Electrical Compatibility: Both devices operate within the -40°C to 85°C temperature range and share identical input offset voltage specifications (200 µV). The OPA344PA demonstrates superior performance in slew rate (0.8 V/µs vs. 0.2 V/µs) and gain bandwidth product (1 MHz vs. 500 kHz), with significantly lower input bias current (0.2 pA vs. 25 nA).

Circuit Count Mismatch: The MAX494EPD+ integrates four amplifier circuits, while the OPA344PA provides a single circuit. Applications requiring four independent channels must either employ four OPA344PA devices or select an alternative quad-channel operational amplifier.

Supply Voltage Range: The OPA344PA operates within 2.5V to 5.5V, which overlaps the MAX494EPD+ range (2.7V to 6V) but does not extend to the full 6V maximum. Applications requiring operation above 5.5V require alternative solutions.

Package Compatibility: Both devices use through-hole DIP packages with 0.300" (7.62mm) pitch. However, the OPA344PA uses 8-DIP while the MAX494EPD+ uses 14-DIP, requiring PCB redesign for direct substitution.

Compliance Status: The MAX494EPD+ is ROHS3 compliant. RoHS compliance status for the OPA344PA is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can the OPA344PA directly replace the MAX494EPD+ on existing PCBs?

A: No. The OPA344PA uses an 8-DIP package while the MAX494EPD+ uses a 14-DIP package. Direct board-level replacement is not possible without PCB redesign. Additionally, the OPA344PA provides one amplifier circuit versus four in the MAX494EPD+.

Q: What is the primary limitation when substituting the OPA344PA for the MAX494EPD+?

A: The OPA344PA is a single-channel device, while the MAX494EPD+ integrates four independent amplifier circuits. Applications requiring four channels must employ multiple OPA344PA devices or select a quad-channel alternative operational amplifier.

Q: Are the supply voltage ranges compatible between these devices?

A: Partial compatibility exists. The OPA344PA operates within 2.5V to 5.5V, while the MAX494EPD+ operates within 2.7V to 6V. Applications requiring operation above 5.5V cannot use the OPA344PA.

Q: What are the key electrical performance differences?

A: The OPA344PA demonstrates superior performance: slew rate of 0.8 V/µs (versus 0.2 V/µs), gain bandwidth product of 1 MHz (versus 500 kHz), and input bias current of 0.2 pA (versus 25 nA). Input offset voltage is identical at 200 µV.

Q: Why is the MAX494EPD+ classified as obsolete?

A: The MAX494EPD+ is listed as obsolete by the manufacturer. This designation indicates discontinued production and limited availability through standard distribution channels. The OPA344PA, classified as active, represents a current-generation alternative with ongoing manufacturing support.

Q: What compliance certifications apply to these devices?

A: The MAX494EPD+ is ROHS3 compliant. RoHS compliance status for the OPA344PA is not specified in the provided technical data.

Q: Can the OPA344PA output current support the same load as the MAX494EPD+?

A: No. The MAX494EPD+ provides 30 mA per channel output current, while the OPA344PA provides 15 mA. Applications requiring higher output current must account for this reduction or select alternative devices.