DS1815R-20 Equivalent & Substitute Parts

Part Overview

The DS1815R-20 is a single-channel power supply supervisor IC manufactured by Analog Devices Inc./Maxim Integrated, designed for simple reset and power-on reset applications. This component operates as a push-pull, totem pole output supervisor with a 2.55V voltage threshold and 100ms minimum reset timeout. The device is packaged in SOT-23-3 (TO-236-3, SC-59) surface mount configuration.

The DS1815R-20 is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain system functionality and ensure continued availability for new designs and production requirements.

Substiute Parts

DS1815R-20

Analog Devices Inc./Maxim IntegratedIn Stock: 15214DS1815R-20 Datasheet

Current PartRFQ

MCP100T-270I/TT

Microchip TechnologyIn Stock: 1520MCP100T-270I/TT Datasheet

MFR RecommendedRFQ

MCP809T-315I/TT

Microchip TechnologyIn Stock: 40495MCP809T-315I/TT Datasheet

MFR RecommendedRFQ

TCM810RENB713

Microchip TechnologyIn Stock: 61871TCM810RENB713 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS1815R-20 are qualified based on the following critical parameters:

• Functional Type: Simple Reset/Power-On Reset supervisor IC
• Package Compatibility: SOT-23-3 surface mount package (TO-236-3, SC-59)
• Output Configuration: Push-Pull, Totem Pole output
• Number of Channels: Single channel (1 voltage monitored)
• Operating Temperature Range: -40°C ~ 85°C (TA)
• Voltage Threshold Range: Acceptable threshold values for 2.55V monitoring applications
• Reset Logic Polarity: Active Low or Active High (application-dependent)
• Reset Timeout: Minimum timeout specification

Three substitute parts meet these criteria with active product status and improved compliance characteristics:

1. MCP100T-270I/TT (Microchip Technology) - 2.625V threshold, Active Low reset
2. MCP809T-315I/TT (Microchip Technology) - 3.075V threshold, Active Low reset
3. TCM810RENB713 (Microchip Technology) - 2.63V threshold, Active High reset

Parameter Comparison

Engineering Selection Recommendations

MCP100T-270I/TT is the closest functional equivalent to the DS1815R-20. It maintains Active Low reset logic, operates within the same temperature range, and provides a voltage threshold (2.625V) within acceptable tolerance of the original 2.55V specification. This part is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability.

MCP809T-315I/TT provides an alternative for applications requiring a higher voltage threshold (3.075V). This part maintains Active Low reset logic and identical operating temperature specifications. ROHS3 compliance and active product status support continued production and design flexibility.

TCM810RENB713 is suitable for applications where Active High reset logic is required. The voltage threshold (2.63V) closely matches the original specification. This part is ROHS3 compliant with active product status. Note that reset logic polarity differs from the DS1815R-20 and requires circuit-level verification before implementation.

All three substitute parts share identical package specifications (SOT-23-3), operating temperature range (-40°C ~ 85°C), and moisture sensitivity level (MSL 1) with the original DS1815R-20. All substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements beyond the original obsolete device.

Frequently Asked Questions (FAQ)

Q: Can MCP100T-270I/TT directly replace DS1815R-20 without circuit modifications?

A: MCP100T-270I/TT maintains identical reset logic polarity (Active Low), output configuration (Push-Pull, Totem Pole), and operating temperature range. The voltage threshold difference (2.625V vs. 2.55V) represents a 2.9% variance. Circuit-level verification is required to confirm threshold tolerance acceptance for your specific application.

Q: What is the difference between Active Low and Active High reset logic?

A: Active Low reset logic asserts the reset signal when the voltage threshold is crossed downward, holding the output low during power-on or brownout conditions. Active High reset logic asserts the reset signal high under the same conditions. TCM810RENB713 uses Active High logic, requiring circuit redesign if the original DS1815R-20 Active Low output is directly connected to downstream logic.

Q: Are all substitute parts available in the same packaging options?

A: All three substitute parts are available in SOT-23-3 surface mount package (TO-236-3, SC-59). MCP100T-270I/TT and MCP809T-315I/TT are supplied in Cut Tape (CT) and Digi-Reel® packaging. TCM810RENB713 is supplied in Tape & Reel (TR) packaging. Packaging format does not affect electrical or mechanical compatibility.

Q: Why do substitute parts have longer reset timeout specifications?

A: MCP100T-270I/TT and MCP809T-315I/TT specify 150ms minimum reset timeout compared to DS1815R-20's 100ms minimum. TCM810RENB713 specifies 140ms minimum. Longer timeout values provide additional margin for power supply stabilization and do not prevent use in applications designed for the original 100ms specification.

Q: What compliance advantages do substitute parts offer?

A: All three substitute parts are ROHS3 compliant, whereas the DS1815R-20 is RoHS non-compliant. ROHS3 compliance ensures compatibility with modern manufacturing standards and regulatory requirements in electronics assembly and end-product certification.

Q: Can I use MCP809T-315I/TT in a circuit designed for 2.55V threshold monitoring?

A: MCP809T-315I/TT operates at 3.075V threshold, representing a 20.6% increase from the original 2.55V specification. This part is suitable only for applications where the higher threshold voltage is acceptable or where the circuit can be redesigned to accommodate the different monitoring point.