PT7M7803STEX Equivalent & Substitute Parts

Part Overview

The PT7M7803STEX is a single-channel power management supervisor IC manufactured by Diodes Incorporated, designed for reset and power-on reset applications. This component operates as a simple reset circuit with open drain or open collector output, monitoring a single voltage threshold at 2.93V. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain identical electrical characteristics and mechanical compatibility to ensure direct replacement capability.

Key Parameters

Parameter	Specification
Manufacturer Part Number	PT7M7803STEX
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.93V
Output	Open Drain or Open Collector
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PT7M7803STEX are qualified based on strict parametric equivalence across the following critical criteria:

Voltage Threshold: 2.93V (exact match required)
Output Type: Open Drain or Open Collector (exact match required)
Reset Logic: Active Low (exact match required)
Reset Timeout: 140ms Minimum (exact match required)
Operating Temperature Range: -40°C ~ 85°C (TA) (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (exact match required)
Mounting Type: Surface Mount (exact match required)
Compliance: ROHS3 Compliant, REACH Unaffected (exact match required)

All substitute parts listed maintain 100% parametric equivalence to the main part across these criteria. Substitution is valid regardless of packaging format (Cut Tape, Tape & Reel, or Digi-Reel) or product status variations, provided all electrical and mechanical parameters remain identical.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temp	Package	Product Status	Inventory (Pcs)
PT7M7803STEX	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	32,400
APX803-29SAG-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	66,100
APX803-29SRG-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	3,940
APX803S-29SA-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	21,100
APX803S-29SR-7	Diodes Incorporated	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	2,998
CAT853STBI-T3	onsemi	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	6,372
STM1001SWX6F	STMicroelectronics	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	23,300
UM803SP	Union Semiconductor International Limited	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	4,073
UM803SS	Union Semiconductor International Limited	2.93V	Open Drain/Collector	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	138,340

Engineering Selection Recommendations

All listed substitute parts are parametrically equivalent and electrically interchangeable with the PT7M7803STEX. Selection should be based on the following factors:

Product Status Considerations: Parts with Active status (APX803-29SRG-7, APX803S-29SA-7, APX803S-29SR-7, STM1001SWX6F, UM803SP, UM803SS) are preferred for new designs and ongoing production. The PT7M7803STEX and CAT853STBI-T3 are Obsolete; APX803-29SAG-7 is Not For New Designs.

Inventory Availability: UM803SS offers the highest inventory level at 138,340 pieces, followed by APX803-29SAG-7 at 66,100 pieces and STM1001SWX6F at 23,300 pieces. Lower inventory parts (APX803-29SRG-7 at 3,940 pieces and APX803S-29SR-7 at 2,998 pieces) may require longer lead times.

Manufacturer Diversity: Diodes Incorporated (APX803 series), STMicroelectronics (STM1001SWX6F), and Union Semiconductor International Limited (UM803 series) provide multiple sourcing options to mitigate supply chain risk.

Compliance: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can APX803-29SRG-7 directly replace PT7M7803STEX in existing designs?

A: Yes. APX803-29SRG-7 is a parametric equivalent with identical voltage threshold (2.93V), output type (Open Drain/Collector), reset logic (Active Low), reset timeout (140ms minimum), operating temperature range (-40°C ~ 85°C), and SOT-23-3 package. The only difference is packaging format (Tape & Reel vs. Cut Tape), which does not affect electrical performance or board-level compatibility.

Q: What is the difference between UM803SS and UM803SP?

A: Both parts are parametrically equivalent with identical electrical specifications. The difference is in packaging format: UM803SS is supplied in Tape & Reel format with significantly higher inventory (138,340 pieces), while UM803SP is also Tape & Reel format with lower inventory (4,073 pieces). Both are manufactured by Union Semiconductor International Limited and are Active products.

Q: Why is STM1001SWX6F listed as a substitute if it is from a different manufacturer?

A: STM1001SWX6F from STMicroelectronics meets all parametric equivalence criteria: 2.93V threshold, Open Drain/Collector output, Active Low reset, 140ms minimum timeout, -40°C ~ 85°C operating range, SOT-23-3 package, ROHS3 compliance, and REACH Unaffected status. Manufacturer diversity provides supply chain flexibility and reduces single-source dependency risk.

Q: Are there any packaging considerations when substituting these parts?

A: All substitute parts use the identical SOT-23-3 package (TO-236-3, SC-59). Packaging format variations (Cut Tape, Tape & Reel, Digi-Reel) do not affect board-level compatibility or electrical performance. Format selection is determined by assembly process requirements and inventory management practices.

Q: Should I prioritize Active status parts over Obsolete or Not For New Designs parts?

A: For new designs and long-term production, Active status parts are recommended to ensure sustained availability and manufacturer support. For legacy system maintenance or short-term requirements, Obsolete or Not For New Designs parts remain electrically valid substitutes if inventory is available.

Q: Is the 140ms reset timeout specification critical for substitution?

A: Yes. The 140ms minimum reset timeout is a critical parameter that determines circuit behavior during power-on and reset events. All substitute parts must maintain this exact specification to ensure proper system initialization timing and prevent functional degradation.

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