MIC812MU TR Equivalent & Substitute Parts

Part Overview

The MIC812MU TR is a single-channel power management supervisor IC manufactured by Microchip Technology, designed for reset and power-on reset applications. This device operates as a push-pull, totem pole output supervisor with a 4.38V threshold voltage and 140ms minimum reset timeout. The MIC812MU TR is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain identical electrical parameters and mechanical compatibility to ensure direct replacement capability.

Key Parameters

Parameter	Value
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 High
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-253-4, TO-253AA
Supplier Device Package	SOT-143
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MIC812MU TR are qualified based on the following criteria:

Direct Manufacturer Substitutes: Parts that maintain identical electrical specifications and are manufactured by the same or equivalent suppliers. These include MIC812MUY-TR (Microchip Technology, active product status) and STM812MW16F (Nexperia USA Inc.).

Parametric Equivalents: Parts that match all critical electrical parameters including voltage threshold (4.38V), output configuration (push-pull, totem pole), reset logic (active high), reset timeout (140ms minimum), operating temperature range (-40°C ~ 85°C), and package type (SOT-143 / TO-253-4, TO-253AA). These include APX812-44UG-7 (Diodes Incorporated) and MAX812MEUS+T (Analog Devices Inc./Maxim Integrated).

All substitute parts maintain single-channel supervision, identical threshold voltage, and compatible mechanical packaging for direct circuit board replacement.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temp	Package	RoHS Status	Inventory
MIC812MU TR	Microchip Technology	Obsolete	4.38V	Push-Pull, Totem Pole	Active High	140ms Min	-40°C ~ 85°C	SOT-143	RoHS Non-Compliant	733 Pcs
MIC812MUY-TR	Microchip Technology	Active	4.38V	Push-Pull, Totem Pole	Active High	140ms Min	-40°C ~ 85°C	SOT-143	RoHS3 Compliant	1054 Pcs
STM812MW16F	Nexperia USA Inc.	Active	4.38V	Push-Pull, Totem Pole	Active High	140ms Min	-40°C ~ 85°C	SOT-143	Not Specified	2600 Pcs
APX812-44UG-7	Diodes Incorporated	Active	4.38V	Push-Pull, Totem Pole	Active High	140ms Min	-40°C ~ 85°C	SOT-143	RoHS3 Compliant	6300 Pcs
MAX812MEUS+T	Analog Devices Inc./Maxim Integrated	Active	4.38V	Push-Pull, Totem Pole	Active High	140ms Min	-40°C ~ 85°C	SOT-143-4	RoHS3 Compliant	15300 Pcs

Engineering Selection Recommendations

For New Designs: MIC812MUY-TR is the primary recommendation as the active-status successor from the original manufacturer (Microchip Technology) with RoHS3 compliance and identical electrical specifications. This part provides direct compatibility with existing MIC812MU TR designs while ensuring long-term supply availability.

For High-Volume Production: MAX812MEUS+T offers the largest inventory (15300 pcs) with RoHS3 compliance and active product status. APX812-44UG-7 provides an alternative with substantial inventory (6300 pcs) and full parametric equivalence.

For Legacy System Support: STM812MW16F and APX812-44UG-7 are suitable alternatives when MIC812MUY-TR availability is constrained. All substitute parts maintain identical electrical operation and mechanical compatibility.

Compliance Considerations: MIC812MUY-TR, APX812-44UG-7, and MAX812MEUS+T are RoHS3 compliant. The original MIC812MU TR is RoHS non-compliant; substitution with compliant alternatives is recommended for new production.

Frequently Asked Questions (FAQ)

Q: Can MIC812MUY-TR directly replace MIC812MU TR? A: Yes. MIC812MUY-TR is the active-status equivalent from Microchip Technology with identical electrical parameters (4.38V threshold, 140ms reset timeout, push-pull output, active high reset logic) and compatible SOT-143 packaging. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: Are all substitute parts mechanically compatible? A: Yes. All substitute parts use SOT-143 or SOT-143-4 packaging with TO-253-4 and TO-253AA case dimensions, enabling direct board-level replacement without layout modifications.

Q: What is the difference between direct manufacturer substitutes and parametric equivalents? A: Direct manufacturer substitutes (MIC812MUY-TR, STM812MW16F) are offered by the original or established suppliers. Parametric equivalents (APX812-44UG-7, MAX812MEUS+T) are from alternative manufacturers but match all critical electrical specifications. Both categories are suitable for replacement.

Q: Does packaging type affect substitution? A: All parts are supplied in surface-mount SOT-143 packages. Packaging format (Tape & Reel, Bulk, Cut Tape) affects handling and ordering but does not affect electrical or mechanical compatibility.

Q: Why is RoHS compliance important for substitution? A: RoHS3 compliance is required for new designs and production in regulated markets. MIC812MUY-TR, APX812-44UG-7, and MAX812MEUS+T are RoHS3 compliant, while the original MIC812MU TR is not. Substitution ensures regulatory compliance for ongoing production.

Q: Can I use these parts interchangeably in the same circuit? A: Yes. All substitute parts maintain identical voltage threshold (4.38V), output configuration (push-pull, totem pole), reset logic (active high), and reset timeout (140ms minimum). Circuit operation remains unchanged with any qualified substitute.

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