DS1817-20 Equivalent & Substitute Parts

Part Overview

The DS1817-20 is a single-channel power management supervisor IC manufactured by Analog Devices Inc./Maxim Integrated, designed for simple reset and power-on reset applications. This device features push-pull totem pole output configuration and operates across the industrial temperature range of -40°C to 85°C. The DS1817-20 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	DS1817-20
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	2.55V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active High
Reset Timeout	100ms Minimum
Operating Temperature Range	-40°C to 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the DS1817-20 are identified based on the following critical parameters that determine functional compatibility:

Core Substitution Criteria:

Single-channel voltage monitoring capability
Push-pull totem pole output configuration
Active high reset logic
Through-hole TO-92-3 package compatibility
Operating temperature range of -40°C to 85°C
Simple reset/power-on reset functionality

Allowable Parameter Variations:

Voltage threshold tolerance: ±0.075V from 2.55V specification
Reset timeout: Minimum 100ms or greater
Product status: Active or obsolete
RoHS compliance: Compliant or non-compliant variants acceptable

Two substitute parts meet these criteria: the MCP101-270DI/TO (manufacturer-recommended substitute with active product status) and the DS1817-20+ (parametric equivalent with improved RoHS compliance).

Parameter Comparison

Parameter	DS1817-20	MCP101-270DI/TO	DS1817-20+
Manufacturer	Analog Devices Inc./Maxim Integrated	Microchip Technology	Analog Devices Inc./Maxim Integrated
Type	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset
Number of Voltages Monitored	1	1	1
Voltage Threshold	2.55V	2.625V	2.55V
Output Configuration	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole
Reset Logic	Active High	Active High	Active High
Reset Timeout	100ms Minimum	150ms Minimum	100ms Minimum
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MCP101-270DI/TO (Microchip Technology) is the primary substitute for new designs and ongoing production. This part maintains all critical functional parameters while offering active product status and ROHS3 compliance. The voltage threshold variance of 0.075V and reset timeout increase of 50ms fall within acceptable substitution tolerances for typical power management applications. Current inventory availability supports immediate procurement.

DS1817-20+ serves as a parametric equivalent for applications requiring exact voltage threshold and reset timeout matching to the original DS1817-20. This variant provides ROHS3 compliance improvement while maintaining identical electrical specifications. Product status remains obsolete, limiting long-term availability.

For new system designs, MCP101-270DI/TO is the recommended selection due to active product status and regulatory compliance. For legacy system maintenance requiring exact parameter matching, DS1817-20+ provides continuity with improved environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can MCP101-270DI/TO directly replace DS1817-20 in existing designs?

A: Yes. Both devices share identical output configuration (push-pull totem pole), reset logic (active high), operating temperature range (-40°C to 85°C), and through-hole TO-92-3 package. The voltage threshold difference of 0.075V and reset timeout increase of 50ms are within standard substitution tolerances for power management supervisor applications.

Q: What is the difference between MCP101-270DI/TO and DS1817-20+?

A: MCP101-270DI/TO is manufactured by Microchip Technology with active product status and ROHS3 compliance. DS1817-20+ is manufactured by Analog Devices Inc./Maxim Integrated with obsolete product status but identical electrical specifications to the original DS1817-20. MCP101-270DI/TO is preferred for new designs due to ongoing manufacturer support.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-92-3 (TO-226AA) through-hole package with identical pinout for single-channel supervisor applications.

Q: Does the voltage threshold difference of 0.075V between DS1817-20 and MCP101-270DI/TO affect system operation?

A: The voltage threshold variance falls within standard component tolerances. System designs must account for this specification difference during circuit validation. The MCP101-270DI/TO threshold of 2.625V is 0.075V higher than the DS1817-20 specification of 2.55V.

Q: What is the significance of the reset timeout difference?

A: The MCP101-270DI/TO specifies a minimum reset timeout of 150ms compared to 100ms for DS1817-20. This 50ms increase provides extended power-on reset sequencing, which is compatible with most standard applications. System designs requiring the shorter 100ms timeout should specify DS1817-20+ or verify MCP101-270DI/TO compatibility.

Q: Why is RoHS compliance important for this selection?

A: ROHS3 compliance indicates adherence to current environmental and hazardous substance restrictions. MCP101-270DI/TO and DS1817-20+ meet ROHS3 standards, while the original DS1817-20 does not. For applications subject to environmental regulations or customer requirements, ROHS3-compliant alternatives are necessary.

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