PT7M7803SC3EX Equivalent & Substitute Parts

Part Overview

The PT7M7803SC3EX is a single-channel power supply supervisor IC manufactured by Diodes Incorporated, designed for microprocessor reset circuit applications. This component monitors a single voltage threshold and provides an active-low reset output via open-drain configuration. The part is classified as obsolete, making equivalent substitute parts necessary for new production designs and ongoing system support.

Key Parameters

Parameter	Value
Manufacturer Part Number	PT7M7803SC3EX
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PT7M7803SC3EX is determined by strict equivalence across the following critical parameters:

Single voltage monitoring channel
2.93V threshold voltage
Open-drain output configuration
Active-low reset signal
140ms minimum reset timeout
SOT-23-3 package footprint compatibility
Surface mount technology
Operating temperature range -40°C to 85°C
ROHS3 compliance and MSL Level 1

All substitute parts listed maintain identical electrical specifications and package compatibility. Variations exist only in product status, packaging format (Cut Tape, Tape & Reel), and manufacturer identity.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Package	Product Status	Inventory
PT7M7803SC3EX	Diodes Incorporated	2.93V	Open Drain	140ms Min	SOT-23-3	Obsolete	34,895 Pcs
APX803-29SAG-7	Diodes Incorporated	2.93V	Open Drain	140ms Min	SOT-23-3	Not For New Designs	66,100 Pcs
APX803-29SRG-7	Diodes Incorporated	2.93V	Open Drain	140ms Min	SOT-23-3	Active	3,940 Pcs
APX803S-29SA-7	Diodes Incorporated	2.93V	Open Drain	140ms Min	SOT-23-3	Active	21,100 Pcs
APX803S-29SR-7	Diodes Incorporated	2.93V	Open Drain	140ms Min	SOT-23-3	Active	2,998 Pcs
CAT853STBI-T3	onsemi	2.93V	Open Drain	140ms Min	SOT-23-3	Obsolete	6,372 Pcs
STM1001SWX6F	STMicroelectronics	2.93V	Open Drain	140ms Min	SOT-23-3	Active	23,300 Pcs
UM803SP	Union Semiconductor International Limited	2.93V	Open Drain	140ms Min	SOT-23-3	Active	4,073 Pcs
UM803SS	Union Semiconductor International Limited	2.93V	Open Drain	140ms Min	SOT-23-3	Active	138,340 Pcs

Engineering Selection Recommendations

For new designs, prioritize parts with Active product status. The APX803-29SRG-7, APX803S-29SA-7, APX803S-29SR-7, STM1001SWX6F, UM803SP, and UM803SS all maintain active status and full ROHS3 compliance with MSL Level 1 rating.

The UM803SS offers the highest inventory availability at 138,340 pieces, providing supply chain stability. The STM1001SWX6F from STMicroelectronics provides an alternative manufacturer source with 23,300 pieces in stock and active product status.

For applications requiring Diodes Incorporated components specifically, the APX803-29SRG-7 is the recommended primary choice with active status, followed by APX803S-29SA-7 as a secondary option.

Parts marked "Not For New Designs" (APX803-29SAG-7) and "Obsolete" (PT7M7803SC3EX, CAT853STBI-T3) are suitable only for legacy system maintenance and repair applications.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for PT7M7803SC3EX?

A: Yes. All listed parts are parametric equivalents with identical voltage threshold (2.93V), output configuration (open-drain), reset timeout (140ms minimum), and SOT-23-3 package footprint. Electrical and mechanical compatibility is confirmed across all substitutes.

Q: What is the difference between the various APX803 part numbers?

A: The APX803 series variants differ in packaging format and product status. APX803-29SRG-7 uses Tape & Reel packaging and maintains Active status. APX803-29SAG-7 uses Cut Tape & Digi-Reel packaging with Not For New Designs status. APX803S-29SA-7 and APX803S-29SR-7 are Active variants with Tape & Reel packaging. All share identical electrical specifications.

Q: Why should I choose UM803SS over other options?

A: The UM803SS provides the highest inventory availability (138,340 pieces) and maintains Active product status with full ROHS3 compliance. This ensures supply continuity and supports long-term production requirements.

Q: Are there any compliance or certification differences between manufacturers?

A: All listed parts maintain ROHS3 compliance, MSL Level 1 rating, and identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Compliance profiles are equivalent across all manufacturers represented.

Q: Can I mix different manufacturers in the same production batch?

A: Yes. All parts meet identical electrical and mechanical specifications. However, standard quality assurance practices recommend maintaining consistent sourcing within a single production lot when possible.

Q: What packaging options are available?

A: Substitute parts are available in Cut Tape (CT), Cut Tape & Digi-Reel (CT & Digi-Reel), and Tape & Reel (TR) formats. All maintain the same SOT-23-3 physical package. Select packaging based on assembly equipment compatibility and order quantity requirements.

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