PT7M7803TTEX Equivalent & Substitute Parts

Part Overview

The PT7M7803TTEX is a supervisor integrated circuit manufactured by Diodes Incorporated, designed for power management applications requiring single-channel voltage monitoring and reset control. This device operates as a simple reset/power-on reset circuit with open drain or open collector output configuration in a SOT-23-3 surface mount package.

The PT7M7803TTEX is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	PT7M7803TTEX
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Package / Case	TO-236-3, SC-59, SOT-23-3
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	3.08V
Output	Open Drain or Open Collector
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the PT7M7803TTEX is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Single-channel voltage monitoring capability
Voltage threshold: 3.08V
Output type: Open Drain or Open Collector
Reset polarity: Active Low
Reset timeout: 140ms Minimum
Package: SOT-23-3 (TO-236-3, SC-59)
Operating temperature range: -40°C to 85°C minimum
Surface mount configuration
RoHS3 compliance

Substitute parts are grouped into two categories based on these parameters:

Category 1: Direct Parametric Equivalents (Open Drain/Open Collector Output) Parts matching all primary criteria with identical electrical characteristics and output configuration. These parts are fully interchangeable at the circuit level.

Category 2: Functional Equivalents with Output Topology Differences (Push-Pull/Totem Pole Output) Parts meeting voltage threshold, monitoring, and reset specifications but utilizing push-pull or totem pole output instead of open drain/open collector. These require circuit-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Operating Temp	Package	Product Status
PT7M7803TTEX	Diodes Incorporated	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete
APX803S-31SA-7	Diodes Incorporated	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
APX803-31SAG-7	Diodes Incorporated	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs
APX803-31SRG-7	Diodes Incorporated	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT23R	Active
APX803S-31SR-7	Diodes Incorporated	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
CAT853TTBI-GT3	onsemi	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete
STM1001TWX6F	STMicroelectronics	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
UM803TS	Union Semiconductor International Limited	3.08V	Open Drain/Open Collector	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
2T09I50QDBVRG4Q	Texas Instruments	4.55V	Push-Pull/Totem Pole	120ms Min	-40°C ~ 125°C	SOT-23-3	Active
LM809M3-3.08	Texas Instruments	3.08V	Push-Pull/Totem Pole	140ms Min	-40°C ~ 105°C	SOT-23-3	Last Time Buy
LM809M3-2.93	Texas Instruments	2.93V	Push-Pull/Totem Pole	140ms Min	-40°C ~ 105°C	SOT-23-3	Last Time Buy

Engineering Selection Recommendations

Recommended Primary Substitutes (Direct Equivalents):

For applications requiring direct replacement without circuit modification, select from active-status parts with identical electrical specifications:

APX803S-31SA-7 (Diodes Incorporated): Active product status with full parametric equivalence. Available in Cut Tape and Digi-Reel packaging. Recommended for new procurement.
APX803S-31SR-7 (Diodes Incorporated): Active product status with full parametric equivalence. Available in Tape & Reel packaging.
STM1001TWX6F (STMicroelectronics): Active product status with full parametric equivalence. Available in Cut Tape and Digi-Reel packaging with highest inventory availability.
UM803TS (Union Semiconductor International Limited): Active product status with full parametric equivalence. Available in Tape & Reel packaging with highest inventory availability.

Secondary Substitutes (Parametric Equivalents with Packaging or Status Considerations):

APX803-31SRG-7 (Diodes Incorporated): Active product status with full parametric equivalence. Supplied in SOT23R package variant. Verify mechanical compatibility with PCB footprint.

Functional Equivalents Requiring Circuit Evaluation:

LM809M3-3.08 (Texas Instruments): Matches voltage threshold and reset timeout. Output topology is push-pull/totem pole instead of open drain/open collector. Last Time Buy status. Requires verification that output configuration is compatible with existing pull-up resistor network and downstream logic.
2T09I50QDBVRG4Q (Texas Instruments): Automotive-grade part with AEC-Q100 qualification. Voltage threshold is 4.55V (not 3.08V) and output is push-pull/totem pole. Suitable only if application circuit can accommodate different threshold and output topology.

Parts to Avoid for New Designs:

APX803-31SAG-7: Not For New Designs status.
CAT853TTBI-GT3: Obsolete status.
LM809M3-2.93: Last Time Buy status with non-matching 2.93V threshold.
LM809M3-3.08: Last Time Buy status.

All recommended substitutes maintain RoHS3 compliance, MSL Level 1 rating, and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can APX803S-31SA-7 be used as a direct replacement for PT7M7803TTEX?

A: Yes. APX803S-31SA-7 matches all critical electrical parameters: 3.08V threshold, open drain/open collector output, 140ms reset timeout, -40°C to 85°C operating range, and SOT-23-3 package. The part is in active product status. Verify packaging format (Cut Tape vs. Tape & Reel) meets procurement requirements.

Q: What is the difference between APX803S-31SA-7 and APX803S-31SR-7?

A: Both parts are electrically identical with matching voltage threshold, output type, and reset specifications. The primary difference is packaging format: APX803S-31SA-7 is supplied in Cut Tape and Digi-Reel, while APX803S-31SR-7 is supplied in Tape & Reel. Select based on assembly line requirements.

Q: Why are LM809M3-3.08 and 2T09I50QDBVRG4Q listed as substitutes if they have different output types?

A: These parts are listed as functional equivalents because they maintain the same voltage monitoring threshold and reset polarity. However, their push-pull/totem pole output differs from the open drain/open collector configuration of PT7M7803TTEX. Substitution requires circuit-level analysis to confirm compatibility with existing pull-up networks and downstream logic levels. They are not direct drop-in replacements.

Q: Is STM1001TWX6F compatible with the original PT7M7803TTEX footprint?

A: Yes. STM1001TWX6F uses the same SOT-23-3 package (TO-236-3, SC-59) as PT7M7803TTEX. All electrical parameters match, including voltage threshold, output configuration, and reset timing. No PCB modifications are required.

Q: What does "Last Time Buy" status mean for LM809M3-3.08?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available for a limited time, but the part will not be manufactured indefinitely. For new designs or long-term production, select active-status alternatives such as APX803S-31SA-7 or STM1001TWX6F.

Q: Can UM803TS be used in high-volume production?

A: Yes. UM803TS is in active product status with the highest inventory availability (78,621 pieces) among all listed substitutes. It matches all electrical specifications of PT7M7803TTEX and is suitable for high-volume applications. Verify supplier lead times and pricing for your procurement timeline.

Q: Does APX803-31SRG-7 have a different package than other APX803 variants?

A: APX803-31SRG-7 uses SOT23R package variant, while most other APX803 parts use standard SOT-23-3. Verify that your PCB footprint accommodates SOT23R before selecting this part. If your design requires standard SOT-23-3, choose APX803S-31SA-7 or APX803S-31SR-7 instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance consistent with PT7M7803TTEX. All parts also maintain MSL Level 1 (Unlimited) moisture sensitivity rating and EAR99 export classification.

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