MIC811LU TR Equivalent & Substitute Parts

Part Overview

The MIC811LU TR is a single-channel power management supervisor IC manufactured by Microchip Technology, designed for power-on reset and voltage monitoring applications. This component features push-pull totem pole output configuration in a SOT-143 surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The supervisor monitors a single voltage threshold at 4.63V with an active-low reset output and 140ms minimum reset timeout.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC811LU TR
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	4.63V
Output Type	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C to 85°C (TA)
Package / Case	TO-253-4, TO-253AA
Supplier Device Package	SOT-143
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MIC811LU TR is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Single voltage monitoring channel
Voltage threshold of 4.63V (±tolerance)
Active-low reset output logic
140ms minimum reset timeout
Push-pull totem pole output configuration
SOT-143 or SOT-143-4 package compatibility
Surface mount technology
Operating temperature range compatibility (-40°C to 85°C minimum)

Substitution Categories:

Direct Manufacturer Equivalent: MIC811LUY-TR (Microchip Technology) — identical electrical specifications with alternative packaging (Cut Tape & Digi-Reel vs. Tape & Reel). Product status is active.

Parametric Equivalents with Push-Pull Output: ADM811LARTZ-REEL7 (Analog Devices Inc.), APX811-46UG-7 (Diodes Incorporated), CAT811LTBI-GT3 (onsemi), and MAX811LEUS+T (Analog Devices Inc./Maxim Integrated) — all match the push-pull totem pole output, 4.63V threshold, 140ms reset timeout, and active-low reset logic. These parts maintain full electrical compatibility with the original design.

Functional Alternatives with Open Drain Output: STM811LW16F (STMicroelectronics), STM6315LBW13F (STMicroelectronics), ADM6315-46D3ARTZR7 (Analog Devices Inc.), MAX6444US46L+T (Analog Devices Inc./Maxim Integrated), and MAX6805US46D3+T (Analog Devices Inc./Maxim Integrated) — these parts feature open drain or open collector output instead of push-pull. They maintain the 4.63V threshold and active-low reset logic but require circuit design verification for output stage compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Operating Temp Range	Package	Product Status
MIC811LU TR	Microchip Technology	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143	Obsolete
MIC811LUY-TR	Microchip Technology	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143	Active
STM811LW16F	STMicroelectronics	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143-4	Active
ADM811LARTZ-REEL7	Analog Devices Inc.	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143-4	Active
APX811-46UG-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143	Active
CAT811LTBI-GT3	onsemi	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143-4	Obsolete
MAX811LEUS+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143-4	Active
STM811LW16F	STMicroelectronics	4.63V	Push-Pull, Totem Pole	140ms Min	-40°C to 85°C	SOT-143-4	Active
STM6315LBW13F	STMicroelectronics	4.63V	Open Drain or Open Collector	20ms Min	-40°C to 125°C	SOT-143-4	Active
ADM6315-46D3ARTZR7	Analog Devices Inc.	4.63V	Open Drain or Open Collector	140ms Min	-40°C to 125°C	SOT-143-4	Active
MAX6444US46L+T	Analog Devices Inc./Maxim Integrated	4.625V	Open Drain or Open Collector	140ms Min	-40°C to 85°C	SOT-143-4	Active
MAX6805US46D3+T	Analog Devices Inc./Maxim Integrated	4.63V	Open Drain or Open Collector	100ms Min	-40°C to 125°C	SOT-143-4	Active

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required):

MIC811LUY-TR is the primary recommendation as the direct Microchip equivalent. It maintains identical electrical specifications and is currently in active production status, ensuring long-term availability and supply chain stability.

For Push-Pull Output Compatibility (Preferred for Existing Designs):

STM811LW16F, ADM811LARTZ-REEL7, APX811-46UG-7, and MAX811LEUS+T are all suitable direct replacements. These parts maintain the push-pull totem pole output configuration, matching the original circuit interface requirements. All are in active production status except CAT811LTBI-GT3, which is obsolete. Selection among these should prioritize active status parts and verified supply availability.

For Open Drain Output Alternatives (Requires Circuit Verification):

STM6315LBW13F, ADM6315-46D3ARTZR7, MAX6444US46L+T, and MAX6805US46D3+T feature open drain or open collector output instead of push-pull. These parts are suitable only if the circuit design can accommodate the different output stage topology. All are in active production status. Note that MAX6805US46D3+T has a shorter reset timeout (100ms minimum vs. 140ms), which may affect system timing requirements.

Compliance and Certification:

All listed substitute parts maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status, matching the original part's regulatory requirements. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can I use an open drain output part as a direct replacement for the push-pull MIC811LU TR?

A: Open drain and push-pull outputs have different electrical characteristics. Open drain parts (STM6315LBW13F, ADM6315-46D3ARTZR7, MAX6444US46L+T, MAX6805US46D3+T) require external pull-up resistors and may not be compatible with circuits designed for push-pull output. Circuit verification is required before substitution.

Q: What is the difference between MIC811LU TR and MIC811LUY-TR?

A: Both parts are manufactured by Microchip Technology with identical electrical specifications and the same 4.63V threshold, push-pull output, and 140ms reset timeout. The primary difference is packaging: MIC811LU TR is supplied in Tape & Reel format, while MIC811LUY-TR is supplied in Cut Tape & Digi-Reel format. MIC811LUY-TR is currently in active production status.

Q: Why is the MIC811LU TR listed as obsolete?

A: The MIC811LU TR has been discontinued by Microchip Technology. However, equivalent parts from multiple manufacturers remain in active production, providing viable alternatives for new designs and production continuity.

Q: Are all substitute parts available in the same SOT-143 package?

A: Most substitute parts use SOT-143-4 packaging, which is mechanically compatible with SOT-143. APX811-46UG-7 and MIC811LUY-TR are available in SOT-143 packaging. Verify PCB footprint compatibility before final selection, as SOT-143 and SOT-143-4 may have minor dimensional differences.

Q: What is the significance of the 4.63V voltage threshold?

A: The 4.63V threshold determines the supply voltage level at which the supervisor triggers a reset signal. All listed substitute parts maintain this threshold, ensuring the supervisor responds to the same voltage conditions as the original part. This parameter is critical for system power management timing.

Q: Can I substitute a part with a different reset timeout?

A: Reset timeout determines how long the reset signal remains active after the supply voltage crosses the threshold. The original MIC811LU TR specifies 140ms minimum. Parts with shorter timeouts (such as STM6315LBW13F at 20ms or MAX6805US46D3+T at 100ms) may not provide adequate reset pulse duration for all system designs. Verify system requirements before selecting parts with different timeout specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original MIC811LU TR.

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