CAT803SSDI-T3 Equivalent & Substitute Parts

Part Overview

The CAT803SSDI-T3 is a single-channel power supply supervisor IC manufactured by onsemi, designed for power-on reset and simple reset applications. This component monitors a single voltage threshold at 2.93V and provides an active-low reset output via open-drain configuration. 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	CAT803SSDI-T3
Manufacturer	onsemi
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.93V
Output	Open Drain or Open Collector
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	SC-70, SOT-323
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CAT803SSDI-T3 is determined by strict equivalence across the following critical parameters:

Voltage threshold: 2.93V
Output configuration: Open Drain or Open Collector
Reset polarity: Active Low
Reset timeout: 140ms Minimum
Package type: SC-70, SOT-323
Mounting type: Surface Mount
Number of channels monitored: 1 channel

Substitute parts are grouped into two categories:

Parametric Equivalent: CAT803SSDI-GT3 matches all electrical and mechanical specifications of the main part, differing only in packaging format (Cut Tape vs. standard packaging).

Similar Parts: ADM803SAKSZ-REEL, MAX6328XR29+T, MAX803SEXR+T, and MAX803SEXR+T10 provide functional equivalence with allowable variations in operating temperature range and reset timeout specifications, while maintaining identical voltage threshold, output type, and package form factor.

Parameter Comparison

Parameter	CAT803SSDI-T3	CAT803SSDI-GT3	ADM803SAKSZ-REEL	MAX6328XR29+T	MAX803SEXR+T	MAX803SEXR+T10
Manufacturer	onsemi	onsemi	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Voltage - Threshold	2.93V	2.93V	2.93V	2.93V	2.93V	2.93V
Output	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector
Reset	Active Low	Active Low	Active Low	Active Low	Active Low	Active Low
Reset Timeout	140ms Minimum	140ms Minimum	140ms Minimum	100ms Minimum	140ms Minimum	140ms Minimum
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For designs currently using the obsolete CAT803SSDI-T3, the following selection criteria apply:

Direct Replacement (Parametric Equivalent): CAT803SSDI-GT3 provides identical electrical performance and is the preferred choice when onsemi sourcing is required. This part maintains the same voltage threshold, reset timeout, and operating temperature range.

Active Product Alternatives: ADM803SAKSZ-REEL, MAX803SEXR+T, and MAX803SEXR+T10 are active products from Analog Devices Inc./Maxim Integrated with extended operating temperature ranges (-40°C ~ 125°C). These parts are suitable for applications requiring higher temperature operation and offer improved long-term availability.

Specification Variance: MAX6328XR29+T features a reduced reset timeout of 100ms minimum, which differs from the 140ms minimum of the main part. This part is suitable only for applications where the shorter timeout does not impact system requirements.

All substitute parts maintain identical voltage threshold (2.93V), output configuration (open-drain), reset polarity (active-low), package form factor (SC-70, SOT-323), and mounting type (surface mount). All listed substitutes carry ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can CAT803SSDI-GT3 be used as a direct replacement for CAT803SSDI-T3?

A: Yes. CAT803SSDI-GT3 is a parametric equivalent with identical electrical specifications and package form factor. The difference is packaging format (Cut Tape vs. standard packaging).

Q: What is the key difference between MAX6328XR29+T and other substitutes?

A: MAX6328XR29+T specifies a reset timeout of 100ms minimum, compared to 140ms minimum for the main part and most substitutes. Verify that your application does not require the longer timeout before selection.

Q: Are the Analog Devices Inc./Maxim Integrated parts suitable for high-temperature applications?

A: ADM803SAKSZ-REEL, MAX803SEXR+T, and MAX803SEXR+T10 operate across -40°C ~ 125°C, extending the upper temperature limit by 40°C compared to the CAT803SSDI-T3 (-40°C ~ 85°C). These parts are suitable for applications requiring extended temperature operation.

Q: Do all substitute parts meet RoHS compliance?

A: All active substitute parts (ADM803SAKSZ-REEL, MAX6328XR29+T, MAX803SEXR+T, MAX803SEXR+T10) are ROHS3 compliant. The main part and CAT803SSDI-GT3 do not specify RoHS status.

Q: What packaging options are available for these supervisor ICs?

A: All parts use SC-70, SOT-323 package form factor for surface mount applications. Packaging formats vary: CAT803SSDI-T3 uses standard packaging, CAT803SSDI-GT3 uses Cut Tape, ADM803SAKSZ-REEL uses Cut Tape & Digi-Reel, MAX6328XR29+T uses Tape & Reel, and MAX803SEXR+T uses Cut Tape & Digi-Reel.

Q: Is the voltage threshold identical across all parts?

A: Yes. All listed parts monitor a single voltage threshold at 2.93V with active-low reset output configuration.

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