PT7M7809STEX Equivalent & Substitute Parts

Part Overview

The PT7M7809STEX is a supervisor integrated circuit manufactured by Diodes Incorporated, classified as a Power Management PMIC. This device functions as a simple reset/power-on reset supervisor with push-pull, totem pole output configuration in a SOT-23-3 surface mount package. The part is currently in Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Manufacturer Part Number	PT7M7809STEX
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
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)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the PT7M7809STEX is determined by strict equivalence across the following critical parameters:

Voltage Threshold: 2.93V (exact match required)
Output Configuration: Push-Pull, Totem Pole (exact match required)
Reset Logic: Active Low (exact match required)
Reset Timeout: 140ms Minimum (exact match required)
Number of Voltages Monitored: 1 (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (exact match required)
Mounting Type: Surface Mount (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

All substitute parts listed below meet these criteria. Variations in operating temperature range, product status, or packaging format (Cut Tape vs. Tape & Reel) do not affect functional equivalence but may impact procurement and application suitability.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Logic	Reset Timeout	Operating Temp	Package	Product Status	Packaging Format
PT7M7809STEX	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Last Time Buy	Tape & Reel (TR)
APX809S-29SA-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
APX809-29SAG-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	Cut Tape (CT) & Digi-Reel®
APX809-29SRG-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT23R	Not For New Designs	Tape & Reel (TR)
CAT809STBI-GT3	onsemi	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	Cut Tape (CT)
MIC809-5SUY-TR	Microchip Technology	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	Tape & Reel (TR)
MIC809SUY-TR	Microchip Technology	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
STM809SWX6F	STMicroelectronics	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
TCM809SENB713	Microchip Technology	2.93V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Recommendation for New Designs: APX809S-29SA-7 (Diodes Incorporated)

This part is the manufacturer-recommended equivalent with Active product status. It provides extended operating temperature range (-40°C ~ 125°C) compared to the original PT7M7809STEX, offering improved thermal margin for demanding applications. Available in Cut Tape and Digi-Reel packaging formats.

Alternative Active Parts:

MIC809-5SUY-TR and MIC809SUY-TR (Microchip Technology): Both maintain Active status with identical electrical specifications. Available in Tape & Reel and Cut Tape formats respectively.
STM809SWX6F (STMicroelectronics): Active status with full parametric equivalence. Available in Cut Tape and Digi-Reel packaging.
TCM809SENB713 (Microchip Technology): Active status with highest inventory availability (44,991 pcs). Available in Cut Tape and Digi-Reel packaging.

Not Recommended for New Designs:

APX809-29SAG-7 and APX809-29SRG-7: Marked "Not For New Designs" by manufacturer.
CAT809STBI-GT3: Obsolete status; use only for field replacement of existing assemblies where no other option exists.

All recommended parts maintain ROHS3 compliance, REACH Unaffected status, and MSL 1 (Unlimited) rating, ensuring regulatory and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can I use APX809S-29SA-7 as a direct replacement for PT7M7809STEX?

A: Yes. APX809S-29SA-7 is the manufacturer-recommended equivalent with identical electrical specifications (2.93V threshold, push-pull totem pole output, active low reset, 140ms timeout). The extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C) provides additional thermal margin and is functionally compatible with designs rated for the original part's temperature range.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both formats contain identical components in SOT-23-3 packages. Cut Tape is supplied in smaller quantities on carrier tape, suitable for prototyping and low-volume assembly. Tape & Reel is supplied on continuous reel for high-volume automated pick-and-place assembly. Electrical performance is identical; selection depends on production volume and assembly equipment capability.

Q: Why is CAT809STBI-GT3 listed if it is obsolete?

A: CAT809STBI-GT3 is included for reference in field replacement scenarios where existing inventory of this part may be available. It maintains full parametric equivalence to PT7M7809STEX and can be used as a substitute when other active alternatives are unavailable. For new designs, select from parts with Active product status.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH Unaffected, matching the regulatory status of the original PT7M7809STEX. This ensures compatibility with environmental and regulatory requirements across all markets.

Q: Can I interchange parts from different manufacturers?

A: Yes, provided all critical parameters match exactly: voltage threshold (2.93V), output configuration (push-pull totem pole), reset logic (active low), reset timeout (140ms minimum), package (SOT-23-3), and compliance certifications (ROHS3, MSL 1). All listed substitutes meet these criteria and are electrically interchangeable at the board level.

Q: What inventory considerations should I account for?

A: TCM809SENB713 offers the highest inventory availability (44,991 pcs). APX809S-29SA-7 is the manufacturer-recommended part with 12,100 pcs available. For critical applications, verify current inventory status with your supplier, as availability may change based on production schedules and market demand.

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