MAX637ACSA Equivalent & Substitute Parts

Part Overview

The MAX637ACSA is a buck switching regulator IC from Analog Devices Inc./Maxim Integrated designed for negative voltage regulation. It provides a fixed output of -1.31V (-15V) with 200mA output current, operating from a 2.3V to 16.5V input range. The device is classified as a step-down/inverted topology power management IC in the 8-SOIC surface mount package.

The MAX637ACSA is currently listed as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance of systems utilizing this regulator.

Substiute Parts

MAX637ACSA

Analog Devices Inc./Maxim IntegratedIn Stock: 3059MAX637ACSA Datasheet

Current PartRFQ

MAX637ACSA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1023MAX637ACSA+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX637ACSA is determined by strict equivalence across the following critical parameters:

• Output voltage configuration (negative polarity)
• Input voltage range (2.3V to 16.5V)
• Output voltage level (-1.31V / -15V)
• Output current capability (200mA)
• Switching frequency (50kHz)
• Package type (8-SOIC)
• Operating temperature range (0°C to 70°C)
• Topology (buck/step-down inverted)

Parts meeting all these specifications are classified as direct equivalents. Variations in product status, compliance certifications, or packaging format (tube vs. alternative) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The MAX637ACSA+ is a direct electrical and mechanical equivalent to the MAX637ACSA. Both parts share identical functional specifications, electrical performance parameters, and physical packaging.

The primary distinction between these parts is product lifecycle status and compliance certification. The MAX637ACSA is obsolete, while the MAX637ACSA+ maintains active product status. Additionally, the MAX637ACSA+ carries ROHS3 compliance certification, whereas the original MAX637ACSA is non-compliant with RoHS directives.

For new designs or ongoing production requiring negative voltage regulation in this specification range, the MAX637ACSA+ is the appropriate selection. For legacy system maintenance where the original part number must be retained, the MAX637ACSA+ provides full functional compatibility as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Are the MAX637ACSA and MAX637ACSA+ pin-compatible?

A: Yes. Both parts use the 8-SOIC package with identical pinout and electrical characteristics. Direct PCB substitution is possible without circuit modification.

Q: What is the difference between MAX637ACSA and MAX637ACSA+?

A: The parts are electrically and mechanically identical. The primary differences are product status (obsolete vs. active) and RoHS compliance certification (non-compliant vs. ROHS3 compliant). The "+" designation in MAX637ACSA+ indicates the newer variant with updated compliance.

Q: Can I use MAX637ACSA+ in place of MAX637ACSA in existing designs?

A: Yes. The MAX637ACSA+ is a direct substitute with no design changes required. It provides the same electrical performance and physical compatibility.

Q: What packaging formats are available?

A: The MAX637ACSA is available in standard packaging, while the MAX637ACSA+ is supplied in tube packaging. Both use the 8-SOIC (0.154", 3.90mm Width) case style.

Q: Are there alternative manufacturers for this negative buck regulator specification?

A: Substitution information provided is limited to parts explicitly listed in the input parameters. Only the MAX637ACSA+ is documented as an equivalent to the MAX637ACSA.

Q: What is the operating temperature range for these parts?

A: Both the MAX637ACSA and MAX637ACSA+ operate across 0°C to 70°C ambient temperature range.