CAT809RTBI-T3 Equivalent & Substitute Parts

Part Overview

The CAT809RTBI-T3 is a single-channel power management supervisor IC manufactured by onsemi, housed in a SOT-23-3 surface mount package. This component functions as a simple reset/power-on reset supervisor with push-pull, totem pole output configuration. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT809RTBI-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 Configuration	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the CAT809RTBI-T3 is determined by strict parameter matching across the following critical specifications:

Core Electrical Parameters:

Voltage threshold: 2.63V
Output configuration: Push-Pull, Totem Pole
Reset polarity: Active Low
Reset timeout: 140ms Minimum
Single voltage monitoring channel
Simple reset/power-on reset functionality

Physical & Environmental Parameters:

Package type: SOT-23-3 (TO-236-3, SC-59)
Surface mount mounting type
Operating temperature range: -40°C to 85°C minimum
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are classified into three categories:

Direct Manufacturer Equivalent: Parts from onsemi with identical electrical and mechanical specifications.

Parametric Equivalent: Parts from alternative manufacturers (Analog Devices Inc., Diodes Incorporated, Renesas Electronics Corporation) meeting all core electrical parameters and package requirements.

Similar Parts: Components with matching functional parameters but differing product status or minor specification variations.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset	Reset Timeout	Operating Temp	Package	Product Status	RoHS Status
CAT809RTBI-T3	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	Not Listed
MAX809RTRG	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Obsolete	ROHS3 Compliant
CAT809RTBI-GT3	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	ROHS3 Compliant
ADM6326-26ARTZ-R7	Analog Devices Inc.	2.63V	Push-Pull, Totem Pole	Active Low	100ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
MAX809REUR+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	ROHS3 Compliant
MAX809REUR+T10	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	ROHS3 Compliant
APX809-26SAG-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	ROHS3 Compliant
APX809-26SRG-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
ISL88001IH26Z-T	Renesas Electronics Corporation	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
ISL88001IH26Z-T7A	Renesas Electronics Corporation	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
ISL88001IH26Z-TK	Renesas Electronics Corporation	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - onsemi Direct Equivalents: CAT809RTBI-GT3 and MAX809RTRG provide direct functional equivalence to the CAT809RTBI-T3. Both maintain identical electrical specifications and SOT-23-3 packaging. CAT809RTBI-GT3 offers the largest inventory (149,400 pcs) and matches the original operating temperature range. MAX809RTRG extends the operating temperature to 105°C, providing additional thermal margin for demanding applications.

Secondary Recommendation - Active Status Alternatives: APX809-26SRG-7 (Diodes Incorporated), MAX809REUR+T and MAX809REUR+T10 (Analog Devices Inc./Maxim Integrated), and ISL88001IH26Z-T, ISL88001IH26Z-T7A, and ISL88001IH26Z-TK (Renesas Electronics Corporation) are all active products meeting all core electrical parameters. These parts carry ROHS3 compliance certification and ensure long-term availability for new production runs.

Consideration for Legacy Support: APX809-26SAG-7 (Diodes Incorporated) maintains full electrical compatibility but carries "Not For New Designs" status. This part is suitable for sustaining production of existing designs but should not be selected for new development.

Temperature Range Consideration: ADM6326-26ARTZ-R7 (Analog Devices Inc.) operates within the -40°C to 85°C range matching the original specification but specifies a 100ms minimum reset timeout versus the 140ms minimum of the CAT809RTBI-T3. This parameter difference requires circuit-level evaluation for compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use MAX809REUR+T as a direct replacement for CAT809RTBI-T3?

A: Yes. MAX809REUR+T meets all core electrical parameters: 2.63V threshold, push-pull totem pole output, active low reset, and 140ms minimum reset timeout. Both operate within the -40°C to 85°C range. The part is housed in SOT-23-3 packaging and carries active product status with ROHS3 compliance.

Q: What is the difference between APX809-26SAG-7 and APX809-26SRG-7?

A: Both parts are manufactured by Diodes Incorporated and meet identical electrical specifications. APX809-26SRG-7 carries active product status, while APX809-26SAG-7 is designated "Not For New Designs." For new development, APX809-26SRG-7 is the appropriate selection.

Q: Why does ADM6326-26ARTZ-R7 show a 100ms reset timeout instead of 140ms?

A: ADM6326-26ARTZ-R7 specifies a 100ms minimum reset timeout, which differs from the CAT809RTBI-T3 specification of 140ms minimum. This parameter variation requires evaluation against circuit timing requirements before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance certification except the original CAT809RTBI-T3, which does not list RoHS status. All active and parametric equivalent alternatives meet current environmental compliance standards.

Q: What is the moisture sensitivity difference between onsemi and Renesas parts?

A: onsemi parts (CAT809RTBI-T3, CAT809RTBI-GT3, MAX809RTRG) specify MSL 1 (Unlimited). Renesas ISL88001 variants specify MSL 3 (168 Hours). MSL 3 requires controlled storage and handling within 168 hours of package opening. This difference affects supply chain and assembly process requirements.

Q: Can I substitute parts with different operating temperature ranges?

A: Substitution is permissible only when the substitute part's operating temperature range meets or exceeds the application requirement. MAX809REUR+T and MAX809REUR+T10 extend to -40°C ~ 105°C, providing additional thermal margin. Parts with narrower ranges require confirmation that application conditions remain within specification.

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