CAT8801RTB-GT3 Equivalent & Substitute Parts

Part Overview

The CAT8801RTB-GT3 is a single-channel power supply supervisor IC manufactured by onsemi, designed for simple reset and power-on reset applications. This component operates as a push-pull, totem pole output supervisor with active-low reset functionality. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design considerations. The supervisor monitors a single voltage threshold at 2.63V with a minimum reset timeout of 140ms, housed in a compact SOT-23-3 surface mount package suitable for space-constrained applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CAT8801RTB-GT3
Manufacturer	onsemi
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.63V
Output	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitute parts for the CAT8801RTB-GT3 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Single voltage monitoring channel
Voltage threshold of 2.63V
Push-pull, totem pole output configuration
Active-low reset signal
140ms minimum reset timeout
Operating temperature range of -40°C to 85°C
Surface mount package: TO-236-3, SC-59, or SOT-23-3

All substitute parts listed maintain these core electrical specifications. Variations in product status, packaging format (cut tape vs. tape & reel), and manufacturer-specific certifications are noted but do not affect functional equivalence within the specified parameter set.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage Threshold	Output Type	Reset	Reset Timeout	Operating Temp	Package	Product Status	MSL
CAT8801RTB-GT3	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	1 (Unlimited)
CAT809RTBI-GT3	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	1 (Unlimited)
MIC809RUY-TR	Microchip Technology	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	1 (Unlimited)
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	1 (Unlimited)
APX809-26SRG-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT23R	Active	1 (Unlimited)
ISL88001IH26Z-T7A	Renesas Electronics Corporation	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	3 (168 Hours)
ISL88001IH26Z-T	Renesas Electronics Corporation	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	3 (168 Hours)
ISL88001IH26Z-TK	Renesas Electronics Corporation	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	3 (168 Hours)
PT7M7809RTEX	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Last Time Buy	1 (Unlimited)
STM809RWX6F	STMicroelectronics	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	1 (Unlimited)
TCM809RENB713	Microchip Technology	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	1 (Unlimited)

Engineering Selection Recommendations

For Ongoing Support (Obsolete Part Replacement): Select from parts with Active product status: MIC809RUY-TR, APX809-26SRG-7, ISL88001IH26Z-T7A, ISL88001IH26Z-T, ISL88001IH26Z-TK, STM809RWX6F, or TCM809RENB713. These parts maintain full electrical equivalence while offering continued manufacturer support and availability.

For New Designs: Avoid APX809-26SAG-7 (Not For New Designs status). Prioritize parts with Active status and MSL 1 rating for standard manufacturing environments: MIC809RUY-TR, APX809-26SRG-7, STM809RWX6F, or TCM809RENB713.

For Moisture-Sensitive Environments: If MSL 1 (Unlimited) is required, select from: CAT809RTBI-GT3, MIC809RUY-TR, APX809-26SAG-7, APX809-26SRG-7, PT7M7809RTEX, STM809RWX6F, or TCM809RENB713. Parts with MSL 3 (ISL88001 series) require 168-hour bake-out procedures before assembly.

For Compliance Requirements: All listed parts maintain REACH Unaffected and EAR99 ECCN status, matching the original CAT8801RTB-GT3 compliance profile.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CAT8801RTB-GT3 with any listed substitute? A: Yes, provided the substitute maintains the specified electrical parameters: 2.63V threshold, push-pull totem pole output, active-low reset, 140ms minimum timeout, and -40°C to 85°C operating range. All listed parts meet these criteria.

Q: What is the difference between SOT-23-3 and SOT23R packages? A: Both are surface mount packages with identical pinout and electrical performance. SOT23R is a variant designation used by some manufacturers. APX809-26SRG-7 uses SOT23R designation but is electrically equivalent to SOT-23-3 parts.

Q: Why do some parts have MSL 3 instead of MSL 1? A: MSL (Moisture Sensitivity Level) indicates moisture absorption during storage. MSL 3 parts (ISL88001 series) require a 168-hour bake-out at specified temperature and humidity before assembly. MSL 1 parts have unlimited shelf life without bake-out requirements.

Q: Are there inventory considerations for substitution? A: Inventory levels vary by part and supplier. TCM809RENB713 shows highest inventory (158,754 pcs), while ISL88001IH26Z-T7A shows lower availability (627 pcs). Verify current stock with your supplier before design commitment.

Q: What does "Not For New Designs" status mean? A: APX809-26SAG-7 carries this status, indicating the manufacturer recommends against using this part in new designs. It remains functionally equivalent but may have limited long-term support. Use for legacy system maintenance only.

Q: Can I use Last Time Buy parts like PT7M7809RTEX? A: PT7M7809RTEX is available in current inventory (35,400 pcs) despite Last Time Buy status. This designation indicates the manufacturer will not produce additional quantities after current stock depletes. Suitable for immediate replacement needs but not recommended for long-term production planning.

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