MAX809STRG Equivalent & Substitute Parts

Part Overview

The MAX809STRG is a single-channel power management supervisor IC manufactured by onsemi, designed for power-on reset and simple reset applications. This device operates as a push-pull, totem pole output supervisor with a 2.93V threshold voltage and 140ms minimum reset timeout. The part is actively produced and RoHS3 compliant, making it suitable for modern electronic designs requiring voltage monitoring and reset signal generation.

Equivalent and substitute parts are necessary when the MAX809STRG becomes unavailable, when alternative packaging formats are required for specific PCB layouts, or when design requirements necessitate different operating temperature ranges or reset timeout specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX809STRG
Manufacturer	onsemi
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 ~ 105°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX809STRG is determined by the following critical parameters:

Voltage Threshold: Must be 2.93V
Output Configuration: Must be Push-Pull, Totem Pole
Reset Logic: Must be Active Low
Reset Timeout: Must be 140ms Minimum or greater
Number of Voltages Monitored: Must be 1 channel
Package Compatibility: SOT-23-3 (TO-236-3) or SC-70-3 (SOT-323) for surface mount applications
Operating Temperature: Must support at least -40°C to 85°C; extended range to 105°C or 125°C provides additional design margin
Compliance: RoHS3 compliant, MSL 1, REACH unaffected

Parts are grouped into two categories: Direct Equivalents (identical electrical and package specifications) and Compatible Substitutes (matching electrical parameters with alternative packaging or extended temperature ratings).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage Threshold	Output	Reset Timeout	Operating Temperature	Package / Case	Product Status
MAX809STRG	onsemi	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C (TJ)	TO-236-3, SOT-23-3	Active
APX809-29SAG-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C (TA)	TO-236-3, SOT-23-3	Not For New Designs
LM809M3-2.93/NOPB	Texas Instruments	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C (TA)	TO-236-3, SOT-23-3	Active
LM809M3X-2.93/NOPB	Texas Instruments	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C (TA)	TO-236-3, SOT-23-3	Active
MAX6326UR29+T	Analog Devices Inc./Maxim Integrated	2.93V	Push-Pull, Totem Pole	100ms Min	-40°C ~ 85°C (TA)	TO-236-3, SOT-23-3	Active
MAX809SEUR+	Analog Devices Inc./Maxim Integrated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C (TA)	TO-236-3, SOT-23-3	Active
MAX809SEUR+T	Analog Devices Inc./Maxim Integrated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C (TA)	TO-236-3, SOT-23-3	Active
TCM809SVLB713	Microchip Technology	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C (TA)	SC-70, SOT-323	Active
TCM809SVNB713	Microchip Technology	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C (TA)	TO-236-3, SOT-23-3	Active

Engineering Selection Recommendations

Preferred Direct Equivalents (Active Status, Matching Specifications)

LM809M3-2.93/NOPB and LM809M3X-2.93/NOPB (Texas Instruments): Both are actively produced with identical electrical specifications to the MAX809STRG, including 140ms reset timeout and -40°C to 105°C operating range. These parts are suitable for direct replacement in SOT-23-3 packaging.
MAX809SEUR+T (Analog Devices Inc./Maxim Integrated): Actively produced equivalent with 140ms reset timeout and full -40°C to 105°C operating range. Highest inventory availability (107,600 pcs) among substitute options.

Extended Temperature Range Option

TCM809SVNB713 (Microchip Technology): Offers extended operating temperature to 125°C while maintaining all electrical specifications. Suitable for applications requiring higher temperature margin. Available in SOT-23-3 packaging.
TCM809SVLB713 (Microchip Technology): Identical electrical specifications with extended temperature range to 125°C, but supplied in SC-70-3 (SOT-323) packaging. Select only if PCB layout accommodates smaller package footprint.

Conditional Substitutes

MAX6326UR29+T (Analog Devices Inc./Maxim Integrated): Electrically compatible with 2.93V threshold and push-pull output, but features 100ms minimum reset timeout (shorter than 140ms specification). Use only when application timing requirements permit shorter reset assertion.
APX809-29SAG-7 (Diodes Incorporated): Meets all electrical specifications but carries "Not For New Designs" status. Acceptable only for legacy system maintenance or when no other options are available.

Frequently Asked Questions (FAQ)

Q: Can I substitute the MAX809STRG with any of these parts without PCB modification?

A: Yes, for parts with identical SOT-23-3 packaging: LM809M3-2.93/NOPB, LM809M3X-2.93/NOPB, MAX6326UR29+T, MAX809SEUR+, and MAX809SEUR+T. TCM809SVNB713 also uses SOT-23-3 packaging. TCM809SVLB713 uses SC-70-3 packaging and requires PCB footprint modification.

Q: What is the difference between the Texas Instruments LM809M3 and LM809M3X variants?

A: Both parts are electrically identical with 2.93V threshold, 140ms reset timeout, and -40°C to 105°C operating range in SOT-23-3 packaging. The "X" suffix indicates extended temperature screening or manufacturing process variation, but functional specifications remain equivalent.

Q: Why does MAX6326UR29+T have a shorter reset timeout (100ms vs. 140ms)?

A: The MAX6326UR29+T is a different device family with inherently different reset timing characteristics. It is electrically compatible for voltage threshold and output configuration but must be evaluated for application-specific timing requirements before substitution.

Q: Is the APX809-29SAG-7 suitable for new designs?

A: No. The APX809-29SAG-7 carries "Not For New Designs" product status. It is acceptable only for replacement in existing systems or when alternative parts are unavailable. For new designs, select from actively produced alternatives: LM809M3-2.93/NOPB, LM809M3X-2.93/NOPB, MAX809SEUR+T, or TCM809SVNB713.

Q: Which substitute offers the widest operating temperature range?

A: Both TCM809SVLB713 and TCM809SVNB713 (Microchip Technology) support -40°C to 125°C, providing 20°C additional margin above the MAX809STRG specification. TCM809SVNB713 maintains SOT-23-3 packaging compatibility.

Q: Are all these parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity and REACH unaffected status, matching the MAX809STRG compliance profile.

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