CAT803STBI-T3 Equivalent & Substitute Parts

Part Overview

The CAT803STBI-T3 is a Power Management IC (PMIC) supervisor with open drain or open collector output, designed for simple reset and power-on reset applications. Manufactured by onsemi in SOT-23-3 surface mount package, this component monitors a single voltage threshold at 2.93V with active low reset output and 140ms minimum reset timeout.

The CAT803STBI-T3 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring this functional specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT803STBI-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
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CAT803STBI-T3 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Substitution Criteria:

Voltage threshold: 2.93V
Output type: Open Drain or Open Collector
Reset polarity: Active Low
Reset timeout: 140ms Minimum
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Number of voltages monitored: 1 channel

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalent: Parts from onsemi with identical base specifications and same manufacturer lineage (NCP803SN293T1G).

Parametric Equivalents: Parts from alternative manufacturers (Diodes Incorporated, STMicroelectronics, Union Semiconductor International Limited, Analog Devices Inc./Maxim Integrated) that meet all critical electrical parameters and package requirements.

Active vs. Obsolete Status: Preference given to parts with Active product status for new designs and ongoing supply assurance, while obsolete parts remain functionally equivalent for legacy system support.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Operating Temperature	Package	Product Status	RoHS Status
CAT803STBI-T3	onsemi	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	Not Specified
NCP803SN293T1G	onsemi	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 105°C	SOT-23-3	Obsolete	ROHS3 Compliant
CAT853STBI-T3	onsemi	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	ROHS3 Compliant
MAX6328UR29+T	Analog Devices Inc./Maxim Integrated	2.93V	Open Drain/Collector	100ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
APX803-29SAG-7	Diodes Incorporated	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	ROHS3 Compliant
APX803-29SRG-7	Diodes Incorporated	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT23R	Active	ROHS3 Compliant
APX803S-29SA-7	Diodes Incorporated	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
APX803S-29SR-7	Diodes Incorporated	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
STM1001SWX6F	STMicroelectronics	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
UM803SP	Union Semiconductor International Limited	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	RoHS Compliant
UM803SS	Union Semiconductor International Limited	2.93V	Open Drain/Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	RoHS Compliant

Engineering Selection Recommendations

For Legacy System Support (Obsolete Designs): NCP803SN293T1G (onsemi) provides direct manufacturer continuity with extended operating temperature range (-40°C ~ 105°C) and ROHS3 compliance. CAT853STBI-T3 (onsemi) maintains identical electrical specifications and temperature range with ROHS3 certification.

For Active Production and New Designs: APX803S-29SA-7, APX803S-29SR-7, and APX803-29SRG-7 (Diodes Incorporated) are Active status parts with full ROHS3 compliance and identical electrical parameters. STM1001SWX6F (STMicroelectronics) offers Active status with ROHS3 compliance. UM803SS and UM803SP (Union Semiconductor International Limited) provide Active status with RoHS compliance and highest inventory availability (138,340 and 4,073 units respectively).

For Designs with Relaxed Reset Timeout Requirements: MAX6328UR29+T (Analog Devices Inc./Maxim Integrated) is Active status with ROHS3 compliance but specifies 100ms minimum reset timeout versus 140ms minimum. This part is suitable only when the shorter timeout meets application requirements.

Compliance Considerations: All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification identical to the original CAT803STBI-T3. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all equivalents.

Frequently Asked Questions (FAQ)

Q: Can MAX6328UR29+T be used as a direct replacement for CAT803STBI-T3?

A: MAX6328UR29+T meets all electrical parameters except reset timeout. It specifies 100ms minimum versus the CAT803STBI-T3's 140ms minimum. Use this part only if your application tolerates the shorter reset timeout specification.

Q: What is the difference between APX803-29SAG-7 and APX803-29SRG-7?

A: Both parts are from Diodes Incorporated with identical electrical specifications (2.93V threshold, 140ms reset timeout, -40°C ~ 85°C operating range). APX803-29SAG-7 is Not For New Designs status with Cut Tape packaging. APX803-29SRG-7 is Active status with Tape & Reel packaging and SOT23R supplier device package designation. For new designs, APX803-29SRG-7 is preferred.

Q: Are UM803SS and UM803SP interchangeable?

A: Yes. Both Union Semiconductor International Limited parts share identical electrical specifications, package type (SOT-23-3), and operating temperature range (-40°C ~ 85°C). UM803SS has significantly higher inventory (138,340 units) compared to UM803SP (4,073 units).

Q: Does NCP803SN293T1G have a wider operating temperature range than CAT803STBI-T3?

A: Yes. NCP803SN293T1G operates from -40°C ~ 105°C (TJ) versus CAT803STBI-T3's -40°C ~ 85°C (TA). This extended range may provide thermal margin in applications approaching the upper temperature limit.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts are ROHS3 compliant. UM803SS and UM803SP are RoHS Compliant (not specifically ROHS3 designated). All parts maintain REACH Unaffected status.

Q: What packaging options are available for SOT-23-3 supervisor ICs?

A: Standard packaging includes Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) options. APX803-29SRG-7 uses SOT23R supplier device package designation. Verify packaging compatibility with your assembly process requirements.

Q: Can I use these parts interchangeably in production?

A: All listed parts meet the core electrical specifications (2.93V threshold, open drain/collector output, active low reset, 140ms minimum timeout, SOT-23-3 package). Verify product status (Active vs. Obsolete vs. Not For New Designs) aligns with your design phase and supply chain strategy before implementation.

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