DS1233MS-55 Equivalent & Substitute Parts

Part Overview

The DS1233MS-55 is a single-channel power supply supervisor IC from Analog Devices Inc./Maxim Integrated, designed for power-on reset and supervisory functions in embedded systems. This device monitors a single voltage rail and provides an active-low reset output via open-drain configuration. The DS1233MS-55 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain identical electrical performance and package compatibility while preferably offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Voltage Threshold	4.625V
Number of Voltages Monitored	1
Output Type	Open Drain or Open Collector
Reset Logic	Active Low
Reset Timeout	200ms Minimum
Operating Temperature Range	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the DS1233MS-55 is determined by strict equivalence across the following critical parameters:

Voltage threshold: 4.625V (exact match required)
Number of monitored channels: 1 (single-channel only)
Output configuration: Open Drain or Open Collector
Reset polarity: Active Low
Reset timeout: Minimum 200ms or greater
Operating temperature range: -40°C ~ 85°C or wider
Package: 8-SOIC form factor with identical pinout
Mounting: Surface Mount

The substitute parts identified below meet all electrical and mechanical requirements for direct replacement in existing designs.

Parameter Comparison

Parameter	DS1233MS-55	DS1233MS-55+	MCP130T-475I/SN
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Microchip Technology
Product Status	Obsolete	Active	Active
Voltage Threshold	4.625V	4.625V	4.625V
Number of Voltages Monitored	1	1	1
Output Type	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector
Reset Logic	Active Low	Active Low	Active Low
Reset Timeout	200ms Minimum	200ms Minimum	150ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

DS1233MS-55+ (Direct Manufacturer Upgrade)

The DS1233MS-55+ is the direct successor from Analog Devices Inc./Maxim Integrated. It maintains identical electrical specifications and package configuration while offering active product status. The DS1233MS-55+ achieves ROHS3 compliance, addressing regulatory requirements absent in the obsolete DS1233MS-55. This part is the preferred choice for designs requiring continuity with the original Analog Devices platform and maximum compatibility assurance.

MCP130T-475I/SN (Cross-Manufacturer Alternative)

The MCP130T-475I/SN from Microchip Technology provides equivalent functionality across all critical parameters. This part meets the 4.625V threshold, single-channel monitoring, active-low reset, and 8-SOIC package requirements. The reset timeout of 150ms minimum exceeds the 200ms minimum specification of the original part, ensuring compatibility. MCP130T-475I/SN carries active product status and ROHS3 compliance. Selection of this part is appropriate when Microchip supply chain advantages or existing Microchip component ecosystems are present in the design.

Frequently Asked Questions (FAQ)

Q: Can DS1233MS-55+ be used as a direct replacement for DS1233MS-55?

A: Yes. The DS1233MS-55+ maintains identical voltage threshold (4.625V), single-channel configuration, active-low reset output, reset timeout (200ms minimum), operating temperature range (-40°C ~ 85°C), and 8-SOIC package specifications. The primary difference is product status (active vs. obsolete) and improved RoHS3 compliance.

Q: Is MCP130T-475I/SN compatible with DS1233MS-55 designs?

A: Yes. The MCP130T-475I/SN meets all critical electrical parameters: 4.625V threshold, single-channel monitoring, open-drain output, active-low reset, and identical 8-SOIC package. The reset timeout of 150ms minimum exceeds the 200ms minimum requirement, confirming functional compatibility.

Q: What is the significance of the reset timeout difference between DS1233MS-55 and MCP130T-475I/SN?

A: The DS1233MS-55 specifies a 200ms minimum reset timeout, while the MCP130T-475I/SN specifies 150ms minimum. A lower timeout value indicates faster reset assertion, which is compatible with designs expecting the longer timeout. No circuit modification is required.

Q: Are packaging and mounting specifications identical across all three parts?

A: Yes. All three parts use 8-SOIC (0.154", 3.90mm Width) surface-mount packages with identical pinout and mechanical dimensions. PCB layout and footprints are directly interchangeable.

Q: Which substitute part should be selected for new designs?

A: For new designs, either DS1233MS-55+ or MCP130T-475I/SN is appropriate. DS1233MS-55+ is recommended if maintaining the Analog Devices platform is preferred. MCP130T-475I/SN is recommended if Microchip supply chain or ecosystem integration is advantageous. Both parts offer active product status and full regulatory compliance.

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