MIC809LUY-TR Equivalent & Substitute Parts

Part Overview

The MIC809LUY-TR is a single-channel power supply supervisor IC manufactured by Microchip Technology, designed for microprocessor reset and power-on reset applications. This device monitors a 4.63V threshold voltage and provides active-low reset output with a 140ms minimum timeout. The part is actively produced and ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the original MIC809LUY-TR becomes unavailable, when alternative packaging formats are required for manufacturing optimization, or when extended operating temperature ranges are needed for specific application environments.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	4.63V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 85°C
Package Type	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

Voltage threshold: 4.63V
Output configuration: Push-Pull, Totem Pole
Reset logic: Active Low
Number of voltages monitored: 1
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant
MSL rating: 1 (Unlimited)

Flexible Parameters (May Vary):

Operating temperature range (may be extended)
Package format (SOT-23-3, SC-70-3, or equivalent footprints)
Reset timeout (140ms minimum acceptable; shorter timeouts acceptable if application permits)
Manufacturer (cross-manufacturer substitution allowed)
Product status (active preferred; not for new designs acceptable for legacy applications)

Substitute parts are grouped into three categories: MFR Recommended (direct functional equivalents with verified compatibility), Parametric Equivalents (matching all critical parameters with minor variations), and cross-manufacturer alternatives meeting all electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Logic	Reset Timeout	Operating Temp	Package	Product Status
MIC809LUY-TR	Microchip Technology	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
TCM809LVLB713	Microchip Technology	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SC-70-3	Active
TCM809LVNB713	Microchip Technology	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active
TCM809LENB713	Microchip Technology	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
MAX6346UR46+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	100ms Min	-40°C ~ 85°C	SOT-23-3	Active
MAX6801UR46D2+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	20ms Min	-40°C ~ 125°C	SOT-23-3	Active
MAX809LEUR+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active
MAX809LEXR+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SC-70-3	Active
MAX809LEXR+T10	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SC-70-3	Active
APX809-46SAG-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs
APX809-46SRG-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT23R	Active

Engineering Selection Recommendations

Microchip Technology TCM809 Series (Recommended Primary Substitutes): TCM809LVNB713 provides direct functional equivalence in SOT-23-3 packaging with extended temperature range (-40°C ~ 125°C). TCM809LENB713 matches the original temperature specification (-40°C ~ 85°C) in identical packaging. Both parts are actively produced and ROHS3 compliant. TCM809LVLB713 offers SC-70-3 packaging for space-constrained layouts with extended temperature capability.

Analog Devices/Maxim Integrated MAX809 Series (Cross-Manufacturer Equivalents): MAX809LEUR+T provides identical electrical specifications with 140ms reset timeout in SOT-23-3 packaging and extended operating range (-40°C ~ 105°C). MAX809LEXR+T and MAX809LEXR+T10 offer SC-70-3 packaging with 140ms timeout and -40°C ~ 125°C temperature range. Both are actively produced and ROHS3 compliant.

Alternative Timing Options: MAX6346UR46+T provides 100ms reset timeout (shorter than 140ms specification) in SOT-23-3 packaging. MAX6801UR46D2+T provides 20ms reset timeout (significantly shorter) with extended temperature range. These parts are suitable only when application timing requirements permit shorter reset delays.

Legacy/Discontinued Status: APX809-46SAG-7 (Diodes Incorporated) is marked "Not For New Designs" but remains functionally equivalent with 140ms timeout in SOT-23-3 packaging. APX809-46SRG-7 is actively produced with identical specifications in SOT23R packaging variant.

All recommended substitutes maintain ROHS3 compliance, unlimited MSL rating, and active-low reset logic required for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can TCM809LVNB713 replace MIC809LUY-TR directly? A: Yes. TCM809LVNB713 matches all critical parameters: 4.63V threshold, push-pull totem pole output, active-low reset, 140ms minimum timeout, SOT-23-3 packaging, ROHS3 compliance, and unlimited MSL rating. The extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) provides additional capability without compatibility issues.

Q: What is the difference between SOT-23-3 and SC-70-3 packages? A: Both are surface-mount packages with identical electrical functionality but different physical footprints. SOT-23-3 (TO-236-3, SC-59) is larger; SC-70-3 (SOT-323) is smaller. Package selection depends on PCB layout constraints. Electrical performance is identical.

Q: Can MAX6801UR46D2+T be used as a substitute? A: MAX6801UR46D2+T meets all critical electrical parameters but provides 20ms reset timeout instead of 140ms. Substitution is valid only if application timing requirements permit shorter reset delays. Extended temperature range (-40°C ~ 125°C) is an additional benefit.

Q: Why is APX809-46SAG-7 marked "Not For New Designs"? A: This designation indicates the part is in legacy/mature phase and may have limited future availability. For new designs, select from actively produced alternatives: TCM809 series, MAX809 series, or APX809-46SRG-7 (active status).

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited MSL rating (1), matching the original MIC809LUY-TR specifications.

Q: What determines if a part can substitute for MIC809LUY-TR? A: Critical parameters are voltage threshold (4.63V), output configuration (push-pull totem pole), reset logic (active low), single voltage monitoring, surface mount type, and ROHS3 compliance. Operating temperature range and package format may vary. Reset timeout must be 140ms minimum or shorter if application permits.

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