CAT809STBI-T3 Equivalent & Substitute Parts

Part Overview

The CAT809STBI-T3 is a single-channel power supply supervisor IC manufactured by onsemi, housed in a SOT-23-3 surface mount package. This device functions as a simple reset/power-on reset controller with push-pull totem pole output configuration, designed to monitor power supply voltage and generate reset signals during power transitions.

The CAT809STBI-T3 carries an Obsolete product status. Locating equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this supervisor IC.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT809STBI-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	2.93V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CAT809STBI-T3 are classified based on strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Package / Case: TO-236-3, SC-59, SOT-23-3
Type: Simple Reset/Power-On Reset
Number of Voltages Monitored: 1
Voltage - Threshold: 2.93V
Output Configuration: Push-Pull, Totem Pole
Reset Logic: Active Low
Reset Timeout: 140ms Minimum
Mounting Type: Surface Mount
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

Operating Temperature Range: -40°C ~ 85°C (TA) or -40°C ~ 105°C (TA/TJ)
Product Status: Active, Obsolete, Not For New Designs, or Last Time Buy
Manufacturer: onsemi, Analog Devices Inc./Maxim Integrated, Diodes Incorporated, Microchip Technology
Packaging Format: Cut Tape (CT), Tape & Reel (TR), or Digi-Reel®

Parts meeting all mandatory parameters are classified as direct substitutes or parametric equivalents. Variations in operating temperature range, product status, and packaging format do not preclude substitution compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Reset Timeout	Operating Temp	Package	Product Status	Inventory
CAT809STBI-T3	onsemi	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	19,266 Pcs
MAX809STRG	onsemi	2.93V	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	65,100 Pcs
CAT809STBI-GT3	onsemi	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	95,300 Pcs
ADM6326-29ARTZ-R7	Analog Devices Inc.	2.93V	100ms Min	-40°C ~ 85°C	SOT-23-3	Active	13,603 Pcs
MAX809SEUR+T	Analog Devices Inc./Maxim Integrated	2.93V	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	107,600 Pcs
MAX809SEUR+T10	Analog Devices Inc./Maxim Integrated	2.93V	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	869 Pcs
APX809-29SAG-7	Diodes Incorporated	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	30,100 Pcs
APX809-29SRG-7	Diodes Incorporated	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	18,960 Pcs
MIC809-5SUY-TR	Microchip Technology	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	3,795 Pcs
MIC809SUY-TR	Microchip Technology	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	2,340 Pcs
PT7M7809STEX	Diodes Incorporated	2.93V	140ms Min	-40°C ~ 85°C	SOT-23-3	Last Time Buy	95,200 Pcs

Engineering Selection Recommendations

Primary Recommendation: MAX809STRG

The MAX809STRG is the optimal substitute for the CAT809STBI-T3. This part maintains identical electrical specifications including 2.93V threshold voltage, 140ms minimum reset timeout, and push-pull totem pole output. The MAX809STRG carries Active product status, ensuring long-term availability and supply chain stability. The extended operating temperature range (-40°C ~ 105°C) provides additional thermal margin compared to the original part. Inventory availability of 65,100 units supports immediate procurement.

Secondary Recommendation: MAX809SEUR+T

The MAX809SEUR+T offers equivalent electrical performance with Active product status and superior inventory availability (107,600 units). This part is suitable for applications where extended temperature operation (-40°C ~ 105°C) is beneficial. Packaging in Cut Tape & Digi-Reel® format accommodates both manual and automated assembly workflows.

Alternative Recommendation: MIC809-5SUY-TR or MIC809SUY-TR

Microchip Technology parts MIC809-5SUY-TR and MIC809SUY-TR provide parametric equivalence with Active product status. These options are suitable for designs where Microchip component qualification is required. Both parts maintain the 2.93V threshold and 140ms reset timeout specifications.

Not Recommended for New Designs:

APX809-29SAG-7 and APX809-29SRG-7 carry "Not For New Designs" status and should be avoided for new product development. PT7M7809STEX is designated as Last Time Buy, indicating discontinued production and limited future availability.

Compliance Consideration:

All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory posture of the original CAT809STBI-T3.

Frequently Asked Questions (FAQ)

Q: Can I use MAX809STRG as a direct replacement for CAT809STBI-T3?

A: Yes. The MAX809STRG meets all mandatory electrical and mechanical parameters: 2.93V threshold voltage, 140ms minimum reset timeout, push-pull totem pole output, active low reset logic, and SOT-23-3 package. The extended operating temperature range (-40°C ~ 105°C versus -40°C ~ 85°C) provides additional thermal capability without compromising compatibility.

Q: What is the difference between MAX809SEUR+T and MAX809SEUR+T10?

A: Both parts are electrically identical with matching 2.93V threshold and 140ms reset timeout. The primary difference is packaging format: MAX809SEUR+T is supplied in Cut Tape & Digi-Reel® format, while MAX809SEUR+T10 is supplied in Tape & Reel (TR) format. MAX809SEUR+T offers significantly higher inventory availability (107,600 units versus 869 units).

Q: Why does ADM6326-29ARTZ-R7 show a different reset timeout (100ms minimum)?

A: The ADM6326-29ARTZ-R7 has a reset timeout specification of 100ms minimum, which is shorter than the 140ms minimum of the CAT809STBI-T3. This part remains functionally compatible because a shorter timeout represents a more conservative (faster) reset assertion, which does not violate the original design's reset timing requirements. However, if the application specifically requires 140ms minimum reset timeout, this part should not be used.

Q: Are Diodes Incorporated APX809 parts suitable for production use?

A: APX809-29SAG-7 and APX809-29SRG-7 carry "Not For New Designs" status, indicating that Diodes Incorporated has discontinued active support for these parts. While existing inventory is available, these parts should not be selected for new product development or long-term production commitments.

Q: What is the significance of PT7M7809STEX being marked "Last Time Buy"?

A: "Last Time Buy" designation indicates that the manufacturer has announced end-of-life for this part. Production will cease, and no further manufacturing runs are planned. Existing inventory represents the final available supply. This part should only be considered if immediate short-term requirements exist and alternative parts cannot be qualified in time.

Q: Do all substitute parts require the same PCB footprint?

A: Yes. All listed substitute parts use the SOT-23-3 package (TO-236-3, SC-59), which maintains identical pin configuration, spacing, and PCB footprint. No layout modifications are required for substitution.

Q: Which substitute part offers the best long-term supply assurance?

A: MAX809SEUR+T provides the strongest supply position with Active product status and the highest inventory availability (107,600 units). This part is recommended for applications requiring extended production runs or long-term support.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message