PT7M7809TTEX Equivalent & Substitute Parts

Part Overview

The PT7M7809TTEX is a single-channel power supply supervisor IC manufactured by Diodes Incorporated, designed for power-on reset and simple reset applications. This device operates as a push-pull, totem pole output supervisor with a 3.08V threshold voltage and 140ms minimum reset timeout. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	PT7M7809TTEX
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	3.08V
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)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PT7M7809TTEX is determined by strict equivalence across the following critical parameters:

Voltage threshold: 3.08V
Output configuration: Push-Pull, Totem Pole
Reset logic: Active Low
Reset timeout: 140ms Minimum
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Number of monitored voltages: 1 channel
Operating temperature range: -40°C ~ 85°C minimum

Substitute parts are grouped into two categories: manufacturer-recommended active alternatives and parametric equivalents from other manufacturers. All listed substitutes maintain identical electrical specifications and package compatibility with the original PT7M7809TTEX.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temp	Package	Product Status	Inventory
PT7M7809TTEX	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	21877 Pcs
APX809S-31SA-7	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	15200 Pcs
APX809-31SAG-7	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	20111 Pcs
APX809-31SRG-7	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT23R	Active	15100 Pcs
PT7M7809TTEX-1507	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	638 Pcs
CAT809TTBI-GT3	onsemi	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	71200 Pcs
MIC809TUY-TR	Microchip Technology	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	6252 Pcs
STM809TWX6F	STMicroelectronics	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	22192 Pcs
TCM809TENB713	Microchip Technology	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	35300 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete PT7M7809TTEX, the following selection criteria apply:

Primary Recommendation: APX809-31SAG-7 or APX809-31SRG-7 from Diodes Incorporated. Both parts maintain identical electrical specifications and are active products with established supply chains. APX809-31SAG-7 is available in standard SOT-23-3 packaging, while APX809-31SRG-7 offers SOT23R variant packaging.

Alternative from Same Manufacturer: PT7M7809TTEX-1507 is an active variant of the original part number with identical specifications, though inventory is limited (638 units).

Extended Temperature Option: APX809S-31SA-7 extends the operating temperature range to -40°C ~ 125°C while maintaining all other electrical parameters, suitable for applications requiring higher temperature performance.

Cross-Manufacturer Alternatives: STM809TWX6F (STMicroelectronics), TCM809TENB713 (Microchip Technology), and MIC809TUY-TR (Microchip Technology) provide parametric equivalence with active product status and adequate inventory levels. All maintain identical threshold voltage, output configuration, reset logic, and timeout specifications.

Avoid: CAT809TTBI-GT3 from onsemi, despite high inventory availability, is classified as obsolete and should not be selected for new designs.

All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.39.0001, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PT7M7809TTEX with any of the listed substitutes?

A: Yes, all listed substitute parts maintain identical electrical specifications (3.08V threshold, push-pull totem pole output, active low reset, 140ms timeout) and SOT-23-3 package compatibility. Physical board layout and PCB footprints require no modification.

Q: What is the difference between APX809-31SAG-7 and APX809-31SRG-7?

A: Both parts are parametrically equivalent with identical electrical specifications. The primary difference is packaging: APX809-31SAG-7 uses standard SOT-23-3, while APX809-31SRG-7 uses SOT23R variant. Select based on your PCB footprint requirements.

Q: Why is APX809S-31SA-7 listed separately?

A: APX809S-31SA-7 extends the operating temperature range to -40°C ~ 125°C compared to the standard -40°C ~ 85°C. This part is suitable only for applications requiring the higher temperature specification. All other electrical parameters remain identical.

Q: Are there packaging differences I should consider?

A: All substitute parts use surface mount SOT-23-3 or SOT23R packages compatible with the original PT7M7809TTEX. Verify your PCB footprint matches the specific variant selected. Moisture sensitivity level is 1 (unlimited) for all parts.

Q: Which substitute has the best inventory availability?

A: CAT809TTBI-GT3 has the highest inventory (71200 units), but it is obsolete. For active products, TCM809TENB713 offers 35300 units, STM809TWX6F offers 22192 units, and APX809-31SAG-7 offers 20111 units.

Q: Do all substitutes meet the same compliance standards?

A: Yes, all listed parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS coding (8542.39.0001).

Q: Can I use cross-manufacturer substitutes in production?

A: Yes, all cross-manufacturer alternatives (STMicroelectronics, Microchip Technology, onsemi) maintain identical electrical specifications and package compatibility. Verify with your quality assurance process if manufacturer qualification is required.

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