MAX494EPD Equivalent & Substitute Parts

Part Overview

The MAX494EPD is a general-purpose operational amplifier featuring four independent circuits in a 14-DIP package. This rail-to-rail output amplifier operates across a 2.7V to 6V supply range and is designed for low-power applications requiring multiple amplification stages. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

MAX494EPD

Analog Devices Inc./Maxim IntegratedIn Stock: 2275MAX494EPD 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 eligibility for the MAX494EPD is determined by the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type: General Purpose
• Output Type: Rail-to-Rail
• Voltage - Supply Span: 2.7V minimum to 6V maximum
• Operating Temperature Range: -40°C to 85°C
• Mounting Type: Through Hole
• Package compatibility: 14-DIP or equivalent pin count

Secondary Compatibility Factors:

• Slew Rate: 0.2V/µs or higher
• Gain Bandwidth Product: 500 kHz or higher
• Current - Input Bias: 25 nA or lower
• Voltage - Input Offset: 200 µV or lower
• Current - Output / Channel: 30 mA or higher

The MAX494EPD+ qualifies as a direct substitute based on identical electrical specifications and package configuration. The OPA344PA represents a functional alternative with enhanced performance characteristics but differs in circuit count and package type, requiring application-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

MAX494EPD+ (Direct Substitute): The MAX494EPD+ is the primary equivalent for the MAX494EPD. Both devices share identical electrical specifications, circuit count (4), and 14-DIP package configuration. The MAX494EPD+ offers improved compliance status (ROHS3 Compliant) compared to the original part. Selection of MAX494EPD+ is appropriate for direct replacement in existing designs without circuit modification.

OPA344PA (Functional Alternative): The OPA344PA is a single-channel amplifier from Burr Brown with enhanced performance characteristics. This device exhibits superior slew rate (0.8V/µs vs. 0.2V/µs), higher gain bandwidth product (1 MHz vs. 500 kHz), and significantly lower input bias current (0.2 pA vs. 25 nA). However, the OPA344PA contains only one circuit versus four in the MAX494EPD, requiring four separate devices to achieve equivalent channel count. The OPA344PA operates within a 2.5V to 5.5V supply range, which overlaps but does not fully match the MAX494EPD supply specification. The OPA344PA is classified as Active product status, ensuring long-term availability. Selection of OPA344PA requires circuit redesign to accommodate single-channel architecture and multiple package footprints.

Frequently Asked Questions (FAQ)

Q: Can MAX494EPD+ be used as a direct replacement for MAX494EPD?

A: Yes. The MAX494EPD+ is electrically and mechanically identical to the MAX494EPD. Both devices feature four general-purpose amplifier circuits in a 14-DIP package with identical electrical parameters. The primary difference is packaging format (Tube vs. standard) and improved RoHS compliance status of the MAX494EPD+.

Q: What are the key differences between MAX494EPD and OPA344PA?

A: The MAX494EPD contains four amplifier circuits in a 14-DIP package, while the OPA344PA contains one circuit in an 8-DIP package. The OPA344PA offers superior performance with higher slew rate (0.8V/µs vs. 0.2V/µs), higher bandwidth (1 MHz vs. 500 kHz), and lower input bias current (0.2 pA vs. 25 nA). The OPA344PA supply range is 2.5V to 5.5V, which does not fully encompass the MAX494EPD range of 2.7V to 6V.

Q: Can OPA344PA replace MAX494EPD in a design requiring four amplifier channels?

A: No. The OPA344PA is a single-channel device. Replacing a four-channel MAX494EPD with OPA344PA devices would require four separate OPA344PA packages, four times the board space, and complete circuit redesign. This substitution is not practical for equivalent functionality.

Q: What is the significance of the MAX494EPD obsolete status?

A: Obsolete status indicates the device is no longer manufactured by Analog Devices Inc./Maxim Integrated. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. The MAX494EPD+ and OPA344PA represent available alternatives for new designs or when existing inventory is depleted.

Q: Are there supply voltage compatibility concerns when substituting OPA344PA?

A: Yes. The OPA344PA maximum supply voltage is 5.5V, while the MAX494EPD supports up to 6V. Designs operating at 5.5V to 6V supply voltage cannot use OPA344PA without voltage regulation modifications. Designs operating at 2.5V to 5.5V are compatible with both devices within this overlapping range.

Q: What is the impact of different output current ratings?

A: The MAX494EPD provides 30 mA per channel output current, while the OPA344PA provides 15 mA. Applications requiring output currents between 15 mA and 30 mA per channel must verify that OPA344PA output current is sufficient. Applications requiring greater than 15 mA per channel cannot use OPA344PA without external buffering.

Q: Does RoHS compliance affect substitution decisions?

A: RoHS compliance is a regulatory and procurement consideration rather than a functional parameter. The MAX494EPD is RoHS non-compliant, while MAX494EPD+ is ROHS3 compliant. For applications subject to RoHS regulations, MAX494EPD+ is the required choice. For legacy systems without RoHS requirements, both devices are functionally equivalent.