CAT853RTBI-T3 Equivalent & Substitute Parts

Part Overview

The CAT853RTBI-T3 is a single-channel power management supervisor IC manufactured by onsemi, designed for simple reset and power-on reset applications. This component monitors a single voltage threshold at 2.63V and provides an active-low open-drain output signal. The part is classified as obsolete, making equivalent substitute components necessary for new designs and ongoing production requirements. Functionally equivalent alternatives are available from multiple manufacturers including STMicroelectronics, Diodes Incorporated, Renesas Electronics Corporation, and Union Semiconductor International Limited.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT853RTBI-T3
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	TO-236-3, SC-59, SOT-23-3
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.63V
Output	Open Drain or Open Collector
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CAT853RTBI-T3 is determined by strict equivalence across the following critical parameters:

Voltage threshold: 2.63V
Output type: Open Drain or Open Collector
Reset polarity: Active Low
Reset timeout: 140ms Minimum
Number of voltages monitored: 1 channel
Package / Case: TO-236-3, SC-59, SOT-23-3
Operating temperature range: -40°C ~ 85°C (TA)
Mounting type: Surface Mount

All substitute parts listed below meet these electrical and mechanical specifications. Substitutes are categorized as direct manufacturer equivalents or parametric equivalents based on product status and availability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Polarity	Reset Timeout	Operating Temperature	Package	Product Status	RoHS Status	Inventory (Pcs)
CAT853RTBI-T3	onsemi	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Obsolete	Not Specified	1069
STM1001RWX6F	STMicroelectronics	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	5398
APX803-26SAG-7	Diodes Incorporated	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	24300
APX803-26SRG-7	Diodes Incorporated	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT23R	Active	ROHS3 Compliant	2257
APX803S-26SA-7	Diodes Incorporated	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	4300
APX803S-26SR-7	Diodes Incorporated	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	15400
ISL88002IH26Z-T	Renesas Electronics Corporation	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	801
ISL88002IH26Z-T7A	Renesas Electronics Corporation	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	1079
ISL88002IH26Z-TK	Renesas Electronics Corporation	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant	4999
UM803RS	Union Semiconductor International Limited	2.63V	Open Drain or Open Collector	Active Low	140ms Minimum	-40°C ~ 85°C	SOT-23-3	Active	RoHS Compliant	25183

Engineering Selection Recommendations

The CAT853RTBI-T3 is obsolete and no longer in active production. Direct replacement with an active product status component is required for new designs and production continuity.

STM1001RWX6F (STMicroelectronics) serves as the primary direct manufacturer equivalent, offering identical electrical specifications and ROHS3 compliance with 5398 units in stock.

For applications requiring maximum inventory availability, APX803-26SAG-7 (Diodes Incorporated) provides the highest stock level at 24300 units and maintains full ROHS3 compliance. APX803S-26SR-7 (Diodes Incorporated) offers a secondary option with 15400 units available.

UM803RS (Union Semiconductor International Limited) provides the largest inventory position at 25183 units with RoHS compliance, suitable for high-volume production requirements.

All substitute parts maintain identical voltage threshold, output configuration, reset polarity, and operating temperature specifications. Selection should prioritize product availability, supply chain reliability, and compliance certifications appropriate for the target application.

Frequently Asked Questions (FAQ)

Q: Can I substitute the CAT853RTBI-T3 with any of the listed parts?

A: Yes. All listed substitute parts meet the identical electrical and mechanical specifications: 2.63V threshold, active-low open-drain output, 140ms minimum reset timeout, SOT-23-3 package, and -40°C to 85°C operating temperature range. The CAT853RTBI-T3 is obsolete, making substitution necessary for production.

Q: What is the difference between APX803-26SRG-7 and other APX803 variants?

A: APX803-26SRG-7 uses a SOT23R package variant while other APX803 parts use standard SOT-23-3. All maintain identical electrical specifications. Package selection depends on PCB design and assembly process compatibility.

Q: Are all substitutes RoHS compliant?

A: STMicroelectronics (STM1001RWX6F), Diodes Incorporated (APX803 series), and Renesas Electronics Corporation (ISL88002 series) parts are ROHS3 compliant. Union Semiconductor International Limited (UM803RS) is RoHS compliant. Verify compliance requirements for your specific application.

Q: Which substitute offers the best availability?

A: UM803RS provides the highest inventory at 25183 units, followed by APX803-26SAG-7 at 24300 units. Both are suitable for high-volume production requirements.

Q: Do I need to modify my PCB layout to use a substitute part?

A: All substitute parts use the same SOT-23-3 package footprint as the CAT853RTBI-T3, except APX803-26SRG-7 which uses SOT23R. Standard SOT-23-3 footprints are compatible with all other listed parts without PCB modification.

Q: What is the moisture sensitivity level difference between manufacturers?

A: onsemi CAT853RTBI-T3 specifies MSL 1 (Unlimited). Renesas ISL88002 series specifies MSL 3 (168 Hours). Other manufacturers do not specify MSL. Verify moisture handling requirements for your manufacturing process.

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