DS1815-20 Equivalent & Substitute Parts

Part Overview

The DS1815-20 is a supervisor integrated circuit from Analog Devices Inc./Maxim Integrated, designed for power management applications requiring single-channel voltage monitoring and reset functionality. This device operates as a push-pull, totem pole output supervisor with active-low reset control and a 100ms minimum reset timeout. The DS1815-20 is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

DS1815-20

Analog Devices Inc./Maxim IntegratedIn Stock: 947DS1815-20 Datasheet

Current PartRFQ

MCP100-270DI/TO

Microchip TechnologyIn Stock: 3408MCP100-270DI/TO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1815-20 is determined by strict alignment of the following critical parameters:

• Single-channel voltage monitoring capability with push-pull, totem pole output configuration
• Active-low reset logic with minimum 100ms reset timeout
• Through-hole mounting in TO-92-3 package format
• Operating temperature range of -40°C to 85°C
• Voltage threshold compatibility within acceptable tolerance for the application circuit

The MCP100-270DI/TO from Microchip Technology meets these core functional requirements. While minor variations exist in voltage threshold (2.625V vs. 2.55V) and reset timeout (150ms vs. 100ms), these differences remain within the operational envelope for single-channel supervisor applications. The substitute maintains identical output topology, reset polarity, package format, and temperature rating.

Parameter Comparison

Engineering Selection Recommendations

The MCP100-270DI/TO is the designated manufacturer-recommended substitute for the DS1815-20. Selection of this alternative is supported by the following factors:

• Active product status: The MCP100-270DI/TO is in active production, ensuring long-term availability and supply chain stability compared to the obsolete DS1815-20.
• Regulatory compliance: The substitute meets ROHS3 compliance requirements, addressing environmental and regulatory standards applicable to modern manufacturing and distribution.
• Functional equivalence: Both devices operate identically as single-channel supervisors with push-pull output, active-low reset, and identical temperature operating range.
• Package compatibility: Both components use the TO-92-3 through-hole package, enabling direct mechanical and electrical substitution without PCB redesign.
• Threshold and timing tolerance: The voltage threshold difference of 75mV (2.55V to 2.625V) and reset timeout increase of 50ms fall within acceptable operational margins for supervisor circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the MCP100-270DI/TO be used as a direct replacement for the DS1815-20 without circuit modification?

A: Yes. Both devices share identical output topology (push-pull, totem pole), reset polarity (active low), package format (TO-92-3), and operating temperature range (-40°C to 85°C). The voltage threshold and reset timeout variations are within acceptable tolerance for single-channel supervisor applications.

Q: What is the significance of the voltage threshold difference between the two parts?

A: The DS1815-20 monitors at 2.55V while the MCP100-270DI/TO monitors at 2.625V. This 75mV difference represents approximately 2.9% variation. Circuit design must account for this threshold offset when selecting the appropriate substitute for specific voltage monitoring requirements.

Q: Why is the reset timeout longer on the MCP100-270DI/TO?

A: The MCP100-270DI/TO specifies a 150ms minimum reset timeout compared to the DS1815-20's 100ms minimum. This extended timeout provides additional system stabilization time during power-on or reset events. Applications requiring the shorter 100ms timeout must evaluate whether the extended delay affects system performance.

Q: Are there package or mounting differences between these components?

A: No. Both the DS1815-20 and MCP100-270DI/TO use the TO-92-3 through-hole package (TO-226-3, TO-226AA designation). Pin configuration and mechanical footprint are identical, permitting direct PCB substitution.

Q: What compliance advantages does the MCP100-270DI/TO offer?

A: The MCP100-270DI/TO is ROHS3 compliant, meeting current environmental and regulatory standards for electronic components. The DS1815-20 is RoHS non-compliant, making the substitute preferable for applications subject to modern regulatory requirements.

Q: Is the MCP100-270DI/TO available in the same packaging format?

A: Yes. The MCP100-270DI/TO is supplied in a bag package format and maintains the TO-92-3 through-hole configuration identical to the DS1815-20, ensuring compatibility with existing PCB designs and assembly processes.