MIC809LU-TR Equivalent & Substitute Parts

Part Overview

The MIC809LU-TR is a single-channel power supply supervisor IC manufactured by Microchip Technology, designed for power-on reset and system monitoring applications. It features push-pull totem pole output configuration in a compact SOT-23-3 surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain identical electrical specifications including 4.63V threshold voltage, active-low reset output, and 140ms minimum reset timeout to ensure direct circuit compatibility.

Key Parameters

Parameter	Value
Voltage Threshold	4.63V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout (Minimum)	140ms
Number of Channels	1
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 85°C or -40°C to 125°C (variant dependent)
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across five critical dimensions:

1. Electrical Specifications: All substitute parts must maintain 4.63V threshold voltage, push-pull totem pole output, active-low reset logic, and 140ms minimum reset timeout. These parameters ensure functional equivalence in power supply monitoring and reset signal generation.

2. Package Compatibility: Substitutes are grouped by package type. SOT-23-3 (TO-236-3, SC-59) packages are directly interchangeable on the same PCB footprint. SC-70-3 (SOT-323) packages require PCB layout modification due to different pin spacing and body dimensions.

3. Operating Temperature Range: The original MIC809LU-TR operates -40°C to 85°C. Substitutes with extended temperature ranges (-40°C to 125°C) are compatible for standard applications and provide additional thermal margin. Substitutes with identical or narrower temperature ranges maintain specification parity.

4. Reset Timeout Tolerance: Parts with 140ms minimum reset timeout match the original specification exactly. Parts with shorter timeouts (100ms, 20ms) do not qualify as direct substitutes due to different system reset behavior.

5. Product Status and Compliance: Active product status ensures ongoing availability and supply chain reliability. RoHS3 compliance and REACH unaffected status are standard for modern substitutes.

Parameter Comparison

Part Number	Manufacturer	Package	Voltage Threshold	Output Type	Reset Timeout (Min)	Temp Range	Product Status	RoHS Status
MIC809LU-TR	Microchip Technology	SOT-23-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 85°C	Discontinued	Non-compliant
MIC809LUY-TR	Microchip Technology	SOT-23-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 85°C	Active	RoHS3 Compliant
TCM809LENB713	Microchip Technology	SOT-23-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 85°C	Active	RoHS3 Compliant
TCM809LVNB713	Microchip Technology	SOT-23-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 125°C	Active	RoHS3 Compliant
TCM809LVLB713	Microchip Technology	SC-70-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 125°C	Active	RoHS3 Compliant
STM809LWX6F	STMicroelectronics	SOT-23-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 85°C	Active	RoHS3 Compliant
MAX809LEUR+T	Analog Devices Inc./Maxim Integrated	SOT-23-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 105°C	Active	RoHS3 Compliant
MAX809LEXR+T	Analog Devices Inc./Maxim Integrated	SC-70-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 125°C	Active	RoHS3 Compliant
MAX809LEXR+T10	Analog Devices Inc./Maxim Integrated	SC-70-3	4.63V	Push-Pull, Totem Pole	140ms	-40°C to 125°C	Active	RoHS3 Compliant
MAX6346UR46+T	Analog Devices Inc./Maxim Integrated	SOT-23-3	4.63V	Push-Pull, Totem Pole	100ms	-40°C to 85°C	Active	RoHS3 Compliant
MAX6801UR46D2+T	Analog Devices Inc./Maxim Integrated	SOT-23-3	4.63V	Push-Pull, Totem Pole	20ms	-40°C to 125°C	Active	RoHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (SOT-23-3 Package, 140ms Reset Timeout):

MIC809LUY-TR, TCM809LENB713, and STM809LWX6F are direct electrical and mechanical equivalents to MIC809LU-TR. All three maintain identical voltage threshold, output configuration, reset logic, and reset timeout specifications. MIC809LUY-TR is the primary Microchip Technology equivalent with highest inventory availability (14,810 pcs). TCM809LENB713 and STM809LWX6F provide cross-manufacturer alternatives with active product status and RoHS3 compliance. These parts require no PCB layout modification and support identical circuit operation.

Extended Temperature Substitutes (SOT-23-3 Package, 140ms Reset Timeout):

TCM809LVNB713 extends operating temperature to -40°C to 125°C while maintaining SOT-23-3 package compatibility. This part is suitable for applications requiring enhanced thermal performance without PCB redesign.

Package-Variant Substitutes (SC-70-3 Package, 140ms Reset Timeout):

TCM809LVLB713, MAX809LEXR+T, and MAX809LEXR+T10 provide 140ms reset timeout functionality in SC-70-3 package format. These parts require PCB footprint modification due to different pin spacing (1.27mm vs. standard spacing) and reduced body dimensions. All three support extended temperature operation (-40°C to 125°C). Selection between these variants depends on PCB layout constraints and supply chain availability.

MAX809LEUR+T (SOT-23-3, 105°C Maximum):

MAX809LEUR+T maintains SOT-23-3 package compatibility and 140ms reset timeout with operating temperature range of -40°C to 105°C. This part bridges Microchip and Maxim product lines without package modification.

Non-Qualifying Alternatives:

MAX6346UR46+T features 100ms minimum reset timeout, which does not meet the 140ms specification requirement. MAX6801UR46D2+T features 20ms minimum reset timeout, which is incompatible with systems designed for 140ms reset delay. These parts are not suitable for direct substitution despite matching voltage threshold and package format.

Frequently Asked Questions (FAQ)

Q: Can MIC809LUY-TR directly replace MIC809LU-TR without PCB modification?

A: Yes. MIC809LUY-TR is electrically and mechanically identical to MIC809LU-TR. Both use SOT-23-3 package with identical pin configuration, voltage threshold (4.63V), output type (push-pull totem pole), reset logic (active low), and reset timeout (140ms minimum). No PCB layout changes are required.

Q: What is the difference between SOT-23-3 and SC-70-3 packages?

A: SOT-23-3 (TO-236-3, SC-59) and SC-70-3 (SOT-323) are both three-pin surface mount packages but with different physical dimensions and pin spacing. SOT-23-3 has larger body dimensions and standard 2.54mm pin spacing. SC-70-3 has smaller body dimensions and 1.27mm pin spacing. Parts in SC-70-3 package require PCB footprint redesign and cannot be used in SOT-23-3 footprints.

Q: Why are MAX6346UR46+T and MAX6801UR46D2+T listed as non-qualifying substitutes?

A: MAX6346UR46+T specifies 100ms minimum reset timeout instead of 140ms. MAX6801UR46D2+T specifies 20ms minimum reset timeout. Systems designed for MIC809LU-TR expect 140ms reset delay for proper power supply stabilization and microprocessor initialization. Using parts with different reset timeouts alters system timing behavior and may cause initialization failures or data corruption.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original MIC809LU-TR is RoHS non-compliant. Modern replacements meet current environmental and regulatory requirements.

Q: Can TCM809LVNB713 be used in applications requiring -40°C to 85°C operation?

A: Yes. TCM809LVNB713 operates across -40°C to 125°C temperature range, which encompasses the -40°C to 85°C requirement. Extended temperature capability provides additional thermal margin without compromising performance in standard temperature applications.

Q: What inventory considerations apply to substitute selection?

A: MIC809LUY-TR has the highest inventory availability (14,810 pcs) among SOT-23-3 direct equivalents. MAX809LEUR+T offers 26,997 pcs in SOT-23-3 format with 140ms reset timeout and -40°C to 105°C operation. TCM809LVNB713 and TCM809LVLB713 each maintain 15,500+ pcs inventory. Selection should prioritize parts with adequate stock levels for production volume requirements.

Q: Are cross-manufacturer substitutes (Microchip, STMicroelectronics, Maxim) electrically interchangeable?

A: Yes, within the specified parameter constraints. MIC809LUY-TR (Microchip), TCM809LENB713 (Microchip), STM809LWX6F (STMicroelectronics), and MAX809LEUR+T (Maxim) all meet identical electrical specifications for voltage threshold, output configuration, reset logic, and reset timeout. Cross-manufacturer substitution is valid when parameters match exactly.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message