CAT853STBI-T3 Equivalent & Substitute Parts

Part Overview

The CAT853STBI-T3 is a single-channel power supply supervisor IC manufactured by onsemi, designed for simple reset and power-on reset applications. This component monitors a single voltage threshold at 2.93V and provides an active-low open-drain output signal. The device is classified as obsolete, making equivalent substitute parts necessary for new production designs and ongoing system support.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT853STBI-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)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CAT853STBI-T3 are qualified based on strict parametric equivalence across the following criteria:

Critical Matching Parameters:

Single voltage threshold monitoring at 2.93V
Active-low reset output configuration
Open-drain or open-collector output topology
140ms minimum reset timeout
Operating temperature range of -40°C to 85°C
SOT-23-3 package compatibility
ROHS3 compliance and REACH unaffected status

All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the original CAT853STBI-T3. Substitutes are differentiated only by manufacturer, product status, and packaging format (Cut Tape vs. Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temp	Package	Product Status	RoHS Status
CAT853STBI-T3	onsemi	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	ROHS3
APX803-29SAG-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	ROHS3
APX803-29SRG-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3
APX803S-29SA-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3
APX803S-29SR-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3
STM1001SWX6F	STMicroelectronics	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3
UM803SP	Union Semiconductor International Limited	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	RoHS Compliant
UM803SS	Union Semiconductor International Limited	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Recommendation for Active Production: APX803-29SRG-7 (Diodes Incorporated) and APX803S-29SA-7 or APX803S-29SR-7 are preferred substitutes. All three parts carry Active product status, ensuring long-term availability and manufacturing support. These devices maintain full parametric equivalence with the CAT853STBI-T3 and comply with ROHS3 standards.

Alternative Options: STM1001SWX6F (STMicroelectronics) provides an Active status alternative with identical electrical and mechanical specifications. UM803SS and UM803SP (Union Semiconductor International Limited) are Active alternatives with RoHS compliance, offering high inventory availability.

Legacy System Support: APX803-29SAG-7 maintains parametric equivalence but carries Not For New Designs status. This part is suitable only for replacement applications in existing systems where the original CAT853STBI-T3 is no longer available.

Compliance Assurance: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original component.

Frequently Asked Questions (FAQ)

Q: Can APX803-29SRG-7 directly replace CAT853STBI-T3 in existing designs? A: Yes. APX803-29SRG-7 is a parametric equivalent with identical voltage threshold (2.93V), reset logic (active low), output configuration (open drain), reset timeout (140ms minimum), operating temperature range (-40°C to 85°C), and SOT-23-3 package. No circuit modifications are required.

Q: What is the difference between APX803-29SAG-7 and APX803-29SRG-7? A: Both parts are parametrically identical. The primary difference is packaging format: APX803-29SAG-7 is supplied in Cut Tape & Digi-Reel format, while APX803-29SRG-7 is supplied in Tape & Reel format. APX803-29SRG-7 carries Active product status, while APX803-29SAG-7 is Not For New Designs.

Q: Are UM803SS and UM803SP suitable for new designs? A: Yes. Both UM803SS and UM803SP carry Active product status and maintain full parametric equivalence with CAT853STBI-T3. UM803SS offers significantly higher inventory availability (138,340 pcs vs. 4,073 pcs for UM803SP).

Q: Does the SOT-23-3 package remain consistent across all substitutes? A: Yes. All substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), ensuring mechanical and pin compatibility with the original CAT853STBI-T3.

Q: What compliance certifications apply to these substitutes? A: All substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original CAT853STBI-T3.

Q: Why is CAT853STBI-T3 marked as obsolete? A: The original part has been discontinued by onsemi. Equivalent substitutes from active manufacturers (Diodes Incorporated, STMicroelectronics, Union Semiconductor International Limited) provide continued access to this supervisor IC functionality.

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