MAX809MTR Equivalent & Substitute Parts

Part Overview

The MAX809MTR is a single-channel power supply supervisor IC manufactured by onsemi, housed in a SOT-23-3 (TO-236) surface mount package. This device functions as a simple reset/power-on reset controller with push-pull totem pole output, monitoring a 4.38V voltage threshold and providing a 140ms minimum reset timeout. The MAX809MTR is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Part Number	MAX809MTR
Manufacturer	onsemi
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	4.38V
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
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX809MTR is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage threshold: 4.38V
Output type: Push-Pull, Totem Pole
Reset logic: Active Low
Number of monitored voltages: 1
Package type: SOT-23-3 (TO-236) or SC-70-3 (for pin-compatible alternatives)
Mounting type: Surface Mount
Reset timeout: 140ms minimum

Acceptable Variations:

Operating temperature range may differ (substitute parts may have narrower or wider ranges)
Product status may differ (active vs. obsolete)
RoHS compliance status may differ
Manufacturer may differ

Substitute parts are grouped into two categories: direct SOT-23-3 package equivalents and SC-70-3 package alternatives with identical electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temp (TA/TJ)	Package	Product Status	RoHS Status
MAX809MTR	onsemi	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TJ)	SOT-23-3	Obsolete	RoHS non-compliant
LM809M3-4.38/NOPB	Texas Instruments	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
LM809M3X-4.38/NOPB	Texas Instruments	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MAX6346UR44+T	Analog Devices Inc./Maxim Integrated	4.38V	Push-Pull, Totem Pole	Active Low	100ms Min	-40°C ~ 85°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MAX809MEUR+T	Analog Devices Inc./Maxim Integrated	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MAX809MEUR+T10	Analog Devices Inc./Maxim Integrated	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MIC809MUY-TR	Microchip Technology	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C (TA)	SOT-23-3	Active	ROHS3 Compliant
STM809MWX6F	STMicroelectronics	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C (TA)	SOT-23-3	Active	ROHS3 Compliant
TCM809MVLB713	Microchip Technology	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C (TA)	SC-70-3	Active	ROHS3 Compliant
TCM809MVNB713	Microchip Technology	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C (TA)	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (SOT-23-3 Package):

For applications requiring identical package footprint and electrical specifications, the following parts provide direct substitution:

LM809M3-4.38/NOPB and LM809M3X-4.38/NOPB (Texas Instruments): Both offer active product status, ROHS3 compliance, and matching 140ms reset timeout with -40°C to 105°C operating range. These are suitable for new designs and production continuity.
MAX809MEUR+T and MAX809MEUR+T10 (Analog Devices Inc./Maxim Integrated): Active status with ROHS3 compliance, identical electrical specifications, and -40°C to 105°C operating range. Higher inventory availability (17,700 and 659 units respectively) supports production requirements.
TCM809MVNB713 (Microchip Technology): Active status with ROHS3 compliance, extended operating temperature range (-40°C to 125°C), and highest inventory availability (35,200 units). Suitable for applications requiring wider temperature performance.

Alternative Package (SC-70-3):

TCM809MVLB713 (Microchip Technology): Provides identical electrical specifications with SC-70-3 package, extended temperature range (-40°C to 125°C), and ROHS3 compliance. Requires PCB layout modification due to different package footprint.

Conditional Substitution:

MAX6346UR44+T (Analog Devices Inc./Maxim Integrated): Meets all electrical requirements with ROHS3 compliance but features a reduced reset timeout (100ms minimum vs. 140ms) and narrower operating temperature range (-40°C to 85°C). Suitable only for applications where 100ms reset timeout is acceptable.
MIC809MUY-TR and STM809MWX6F: Both provide matching electrical specifications with ROHS3 compliance but operate within -40°C to 85°C range. Suitable for applications not requiring the full -40°C to 105°C temperature range.

All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete MAX809MTR.

Frequently Asked Questions (FAQ)

Q: Can I use MAX6346UR44+T as a direct replacement for MAX809MTR?

A: MAX6346UR44+T matches the voltage threshold (4.38V), output type (push-pull totem pole), reset logic (active low), and package (SOT-23-3). However, it specifies a 100ms minimum reset timeout versus the MAX809MTR's 140ms minimum. Substitution is valid only if your application tolerates the shorter reset timeout. Additionally, the operating temperature range is narrower (-40°C to 85°C vs. -40°C to 105°C).

Q: What is the difference between TCM809MVLB713 and TCM809MVNB713?

A: Both parts are manufactured by Microchip Technology with identical electrical specifications (4.38V threshold, push-pull totem pole output, active low reset, 140ms timeout). The primary difference is package type: TCM809MVLB713 uses SC-70-3 while TCM809MVNB713 uses SOT-23-3. TCM809MVNB713 provides a direct footprint replacement for MAX809MTR. Both offer extended operating temperature range (-40°C to 125°C) and ROHS3 compliance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, addressing the RoHS non-compliance of the obsolete MAX809MTR. This is relevant for applications subject to RoHS regulations.

Q: Which substitute part has the best inventory availability?

A: TCM809MVNB713 (Microchip Technology) offers the highest inventory with 35,200 units in stock, followed by MAX809MEUR+T with 17,700 units. Both provide active product status and ROHS3 compliance.

Q: Can I use a substitute part with a narrower operating temperature range?

A: Substitution is valid only if your application operates within the substitute part's temperature range. For example, MIC809MUY-TR and STM809MWX6F operate within -40°C to 85°C. If your design requires operation at temperatures above 85°C or below -40°C, these parts are not suitable. Verify your application's actual operating temperature requirements before selection.

Q: What does "push-pull totem pole" output mean?

A: Push-pull totem pole output means the reset signal can actively drive both high and low logic states. This configuration provides stronger output drive capability compared to open-drain outputs and is suitable for directly driving reset inputs on microcontrollers and other digital logic.

Q: Is the reset timeout difference between 100ms and 140ms significant?

A: Reset timeout determines the duration the reset signal remains asserted after the monitored voltage crosses the threshold. A 140ms timeout provides a longer stabilization period for power supply and system initialization. A 100ms timeout is shorter and may be insufficient for systems requiring extended power-up sequencing. Verify your system's reset timing requirements before selecting MAX6346UR44+T.

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