MAX851ISA+ Equivalent & Substitute Parts

Part Overview

The MAX851ISA+ is a charge pump switching regulator IC manufactured by Analog Devices Inc./Maxim Integrated, designed for negative voltage generation applications. This component functions as a step-down regulator with negative output configuration, delivering adjustable fixed output voltages ranging from -1.28V to -9V at 5mA output current. The device operates across an input voltage range of 4.5V to 10V with a switching frequency of 100kHz. Currently in active product status with 867 units in stock, the MAX851ISA+ serves applications requiring compact negative voltage regulation in surface mount form factor.

Alternative components become necessary when addressing specific application constraints such as inventory availability, lead time requirements, or design revision cycles while maintaining equivalent electrical and mechanical performance.

Substiute Parts

MAX851ISA+

Analog Devices Inc./Maxim IntegratedIn Stock: 918MAX851ISA+ Datasheet

Current PartRFQ

MAX851ISA+

Analog Devices Inc./Maxim IntegratedIn Stock: 918MAX851ISA+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX851ISA+ is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Topology: Charge Pump
• Output Configuration: Negative
• Output Type: Adjustable (Fixed)
• Number of Outputs: 1
• Input Voltage Range: 4.5V to 10V
• Output Voltage Range: -1.28V to -9V
• Output Current: 5mA
• Switching Frequency: 100kHz
• Synchronous Rectifier: No

Mechanical Equivalence Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• Operating Temperature Range: -25°C ~ 85°C (TA)

Only components matching all specified parameters across electrical, mechanical, and compliance categories qualify as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The MAX851ISA+ maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating, indicating full manufacturing support and environmental regulatory alignment. Selection of this component is appropriate for applications requiring negative voltage regulation within the specified input and output voltage parameters. The charge pump topology with 100kHz switching frequency and 5mA output current capacity defines the functional scope for equivalent component selection.

Direct substitution requires matching all electrical parameters including topology, output configuration, voltage ranges, and current specifications, combined with identical mechanical packaging in 8-SOIC form factor and equivalent compliance certifications. No alternative components have been identified that meet all specified criteria based on the provided parameter set.

Frequently Asked Questions (FAQ)

Q: What defines a direct substitute for the MAX851ISA+?

A: A direct substitute must match all electrical specifications including charge pump topology, negative output configuration, -1.28V to -9V output voltage range, 5mA output current, 100kHz switching frequency, and 4.5V to 10V input voltage range. The component must also be packaged in 8-SOIC form factor with surface mount capability and maintain ROHS3 compliance with MSL 1 rating.

Q: Can components with different output current ratings substitute for the MAX851ISA+?

A: No. Output current rating is a critical electrical parameter. The MAX851ISA+ is specified for 5mA output current. Components with different current ratings do not qualify as direct substitutes.

Q: Are different package types compatible with MAX851ISA+ designs?

A: No. The MAX851ISA+ is specified for 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Different package types require PCB layout modifications and are not considered direct substitutes.

Q: Does the MAX851ISA+ support positive voltage output?

A: No. The MAX851ISA+ is configured exclusively for negative voltage output. Applications requiring positive voltage regulation require different component selection.

Q: What is the significance of the charge pump topology in the MAX851ISA+?

A: The charge pump topology is a specific switching regulator architecture used for voltage conversion without inductors. This topology is integral to the MAX851ISA+ design and is a mandatory matching criterion for substitute components.

Q: Is the MAX851ISA+ suitable for applications requiring output currents greater than 5mA?

A: No. The MAX851ISA+ is rated for maximum 5mA output current. Applications requiring higher current delivery require alternative component selection with higher current specifications.