MAX178AEWG 12-Bit SAR ADC Equivalent & Substitute Parts

Part Overview

The MAX178AEWG is a 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc./Maxim Integrated. This single-channel data acquisition device features parallel digital output and operates across a wide supply voltage range with both external and internal reference options. The part is classified as obsolete, making identification of active equivalent components essential for new designs and production continuity.

Substiute Parts

MAX178AEWG

Analog Devices Inc./Maxim IntegratedIn Stock: 902MAX178AEWG Datasheet

Current PartRFQ

MAX178AEWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 1117MAX178AEWG+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX178AEWG is determined by strict equivalence across the following critical parameters:

• Resolution and Sampling Rate: 12-bit resolution at 17 kSPS sampling rate
• Channel Configuration: Single-channel, single-ended input
• Conversion Architecture: SAR topology with integrated sample-and-hold
• Reference Options: Support for both external and internal voltage references
• Supply Voltage Compatibility: Dual supply (±5V) and single supply (11.4V ~ 15.75V) operation with 5V digital supply
• Package and Pinout: 24-SOIC surface mount package with identical mechanical and electrical pinout
• Operating Temperature: -40°C to 85°C industrial range

The MAX178AEWG+ qualifies as a direct substitute based on identical electrical specifications and package compatibility. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The MAX178AEWG+ is the direct functional equivalent of the MAX178AEWG and serves as the active production substitute. Selection between these parts is determined by application requirements and regulatory compliance:

MAX178AEWG+ is the preferred choice for new designs and production applications. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance certification. The tube packaging format supports standard manufacturing workflows.

MAX178AEWG remains suitable for legacy system maintenance and repair applications where existing inventory is available. However, this part is classified as obsolete and carries RoHS non-compliant status, limiting its use in regulated industries and new product development.

Both parts are manufactured by Analog Devices Inc./Maxim Integrated and share the same base product number (MAX178), ensuring design compatibility and interchangeability at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can MAX178AEWG+ replace MAX178AEWG in existing designs?

A: Yes. The MAX178AEWG+ is electrically and mechanically identical to the MAX178AEWG. All electrical parameters, pinout, and package dimensions are equivalent. Direct substitution is possible without circuit modification.

Q: What is the difference between MAX178AEWG and MAX178AEWG+?

A: The primary differences are product status and compliance certification. MAX178AEWG is obsolete and RoHS non-compliant. MAX178AEWG+ is an active product with ROHS3 compliance. Electrical specifications and package format are identical.

Q: Are there packaging differences between these parts?

A: Both parts use 24-SOIC surface mount packages with identical dimensions (0.295", 7.50mm width). The MAX178AEWG+ is supplied in tube packaging, while the MAX178AEWG uses standard packaging. This does not affect electrical performance or circuit compatibility.

Q: What supply voltages do these ADCs support?

A: Both parts support dual supply operation (±5V) and single supply operation (11.4V to 15.75V for analog supply). Digital supply is fixed at 5V. Reference voltage can be sourced externally or from the internal reference.

Q: Is the 24-SOIC package suitable for automated assembly?

A: Yes. Both parts use standard 24-SOIC surface mount packages compatible with automated pick-and-place and reflow soldering processes. The 0.295" (7.50mm) width accommodates standard PCB design rules and assembly equipment.

Q: What is the sampling rate of these converters?

A: Both the MAX178AEWG and MAX178AEWG+ operate at 17 kSPS (kilosamples per second) with 12-bit resolution. This sampling rate is fixed and applies to single-channel conversion.