CAT809SSDI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT809SSDI-GT3 is a single-channel power management supervisor IC manufactured by onsemi, designed for reset and power-on reset applications. This device features push-pull, totem pole output configuration with a 2.93V threshold voltage and 140ms minimum reset timeout. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT809SSDI-GT3
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	SC-70, SOT-323
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.93V
Output	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the CAT809SSDI-GT3 is determined by strict parameter matching across the following critical specifications:

Core Electrical Parameters:

Single-channel voltage monitoring capability
2.93V threshold voltage
Push-pull, totem pole output configuration
Active low reset signal
140ms minimum reset timeout
Simple reset/power-on reset functionality

Physical & Environmental Parameters:

SC-70 / SOT-323 package compatibility
Surface mount mounting type
Moisture sensitivity level 1 (unlimited)
Operating temperature range compatibility

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: MAX809SQ293T1G (onsemi) — identical electrical specifications with extended operating temperature range and RoHS3 compliance.

Similar Manufacturer Part: MAX809SEXR+T (Analog Devices Inc./Maxim Integrated) — functionally equivalent with active product status and extended operating temperature range to 125°C.

Parametric Equivalents: MIC809-5SYC3-TR and MIC809SYC3-TR (Microchip Technology) — meet all core electrical and physical parameters with active product status and RoHS3 compliance.

Parameter Comparison

Parameter	CAT809SSDI-GT3	MAX809SQ293T1G	MAX809SEXR+T	MIC809-5SYC3-TR	MIC809SYC3-TR
Manufacturer	onsemi	onsemi	Analog Devices Inc./Maxim Integrated	Microchip Technology	Microchip Technology
Type	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset
Number of Voltages Monitored	1	1	1	1	1
Voltage - Threshold	2.93V	2.93V	2.93V	2.93V	2.93V
Output	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole
Reset	Active Low	Active Low	Active Low	Active Low	Active Low
Reset Timeout	140ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 105°C (TJ)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Obsolete Part Replacement: MAX809SEXR+T is recommended as the primary substitute. This part maintains full electrical and functional equivalence while offering active product status, ensuring long-term availability and supply chain stability. The extended operating temperature range to 125°C provides additional thermal margin for demanding applications.

For Active Product Continuity: MIC809-5SYC3-TR and MIC809SYC3-TR are suitable alternatives from Microchip Technology. Both parts are active products with RoHS3 compliance and meet all core electrical specifications. These options provide design flexibility with established manufacturer support.

For Extended Temperature Applications: MAX809SQ293T1G supports operating temperatures to 105°C (junction temperature), suitable for applications requiring elevated thermal performance while maintaining onsemi manufacturer continuity.

All substitute parts comply with REACH regulations and carry MSL 1 moisture sensitivity classification, matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX809SEXR+T replace CAT809SSDI-GT3 in existing designs? A: Yes. MAX809SEXR+T meets all electrical specifications including 2.93V threshold, push-pull totem pole output, active low reset, and 140ms minimum reset timeout. The identical SC-70 / SOT-323 package enables direct PCB substitution.

Q: What is the difference between the onsemi and Microchip substitute options? A: Both manufacturer groups provide functionally equivalent parts. onsemi options (MAX809SQ293T1G, MAX809SEXR+T) maintain manufacturer continuity. Microchip options (MIC809-5SYC3-TR, MIC809SYC3-TR) offer active product status with established long-term availability. Selection depends on supply chain preference and existing design qualification.

Q: Are there operating temperature differences between substitutes? A: Yes. MAX809SEXR+T supports -40°C to 125°C, MAX809SQ293T1G supports -40°C to 105°C (TJ), and both Microchip parts support -40°C to 85°C. The original CAT809SSDI-GT3 operates -40°C to 85°C. Higher temperature-rated parts provide additional margin but are not required for equivalent operation within the original specification.

Q: Do all substitutes use the same package? A: Yes. All substitute parts use SC-70 / SOT-323 surface mount packaging, identical to the original CAT809SSDI-GT3. No PCB layout modifications are required.

Q: What compliance certifications apply to substitute parts? A: All substitute parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is MSL 1 (unlimited) across all options, matching the original part's environmental classification.

Q: Which substitute offers the best long-term availability? A: MAX809SEXR+T carries active product status from Analog Devices Inc./Maxim Integrated, ensuring ongoing manufacturing and supply chain support. MIC809-5SYC3-TR and MIC809SYC3-TR from Microchip Technology are also active products with established distribution networks.

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