MIC811MU TR Equivalent & Substitute Parts

Part Overview

The MIC811MU TR is a single-channel power management supervisor IC manufactured by Microchip Technology, designed for reset and power-on reset applications. This device features push-pull totem pole output configuration with a 4.38V voltage threshold and 140ms minimum reset timeout. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Active alternatives from multiple manufacturers provide direct functional replacement while maintaining electrical and mechanical compatibility.

Substiute Parts

MIC811MU TR

Microchip TechnologyIn Stock: 736MIC811MU TR Datasheet

Current PartRFQ

MIC811MUY-TR

Microchip TechnologyIn Stock: 2606MIC811MUY-TR Datasheet

DirectRFQ

STM811MW16F

STMicroelectronicsIn Stock: 3197STM811MW16F Datasheet

DirectRFQ

MAX6444US44L+T

Analog Devices Inc./Maxim IntegratedIn Stock: 893MAX6444US44L+T Datasheet

MFR RecommendedRFQ

ADM811MARTZ-REEL

Analog Devices Inc.In Stock: 745ADM811MARTZ-REEL Datasheet

Parametric EquivalentRFQ

ADM811MARTZ-REEL7

Analog Devices Inc.In Stock: 22165ADM811MARTZ-REEL7 Datasheet

Parametric EquivalentRFQ

APX811-44UG-7

Diodes IncorporatedIn Stock: 26856APX811-44UG-7 Datasheet

Parametric EquivalentRFQ

MAX811MEUS+T

Analog Devices Inc./Maxim IntegratedIn Stock: 16804MAX811MEUS+T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC811MU TR are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage threshold: 4.38V (±0.01V tolerance acceptable)
• Output configuration: Push-Pull, Totem Pole
• Reset logic: Active Low
• Reset timeout: 140ms Minimum
• Operating temperature range: -40°C ~ 85°C
• Package / Case: TO-253-4, TO-253AA
• Supplier device package: SOT-143 or SOT-143-4

Direct Substitutes (Identical Parameters): Parts meeting all critical parameters with push-pull totem pole output are classified as direct substitutes. These include MIC811MUY-TR, STM811MW16F, ADM811MARTZ-REEL, ADM811MARTZ-REEL7, APX811-44UG-7, and MAX811MEUS+T.

Functional Equivalent (Output Variation): MAX6444US44L+T operates with open drain or open collector output instead of push-pull totem pole. This represents a functional equivalent requiring circuit-level evaluation for compatibility, as output stage characteristics differ.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Push-Pull Output Required):

MIC811MUY-TR is the primary direct substitute, offering identical electrical parameters with active product status and ROHS3 compliance. This part maintains Microchip Technology manufacturing continuity and is available in high inventory (2590 pcs).

STM811MW16F, ADM811MARTZ-REEL7, MAX811MEUS+T, and APX811-44UG-7 provide equivalent functionality across multiple manufacturers. ADM811MARTZ-REEL7 offers the highest inventory availability (22115 pcs) with ROHS3 compliance. APX811-44UG-7 from Diodes Incorporated also provides substantial inventory (26782 pcs).

All direct substitutes maintain identical voltage threshold (4.38V), reset timeout (140ms minimum), operating temperature range (-40°C ~ 85°C), and push-pull totem pole output configuration.

For Applications Permitting Output Stage Variation:

MAX6444US44L+T operates with open drain or open collector output instead of push-pull configuration. This part is suitable only for applications where the output stage difference does not affect circuit operation. Voltage threshold is 4.375V, within acceptable tolerance of the original 4.38V specification.

Compliance Considerations:

The original MIC811MU TR is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for new production and procurement.

Frequently Asked Questions (FAQ)

Q: Can MIC811MUY-TR directly replace MIC811MU TR in existing designs?

A: Yes. MIC811MUY-TR is a direct substitute with identical electrical parameters, output configuration, and package specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between SOT-143 and SOT-143-4 packages?

A: Both are surface mount packages compatible with TO-253-4 and TO-253AA case designations. SOT-143-4 is the more recent designation for the same physical package. Parts specified as either SOT-143 or SOT-143-4 are mechanically and electrically interchangeable for this application.

Q: Can MAX6444US44L+T replace MIC811MU TR?

A: MAX6444US44L+T is a functional equivalent with identical voltage threshold tolerance and reset timeout. However, it features open drain or open collector output instead of push-pull totem pole. This substitution requires circuit-level evaluation to confirm compatibility with the existing output stage requirements.

Q: Why are some substitutes from different manufacturers?

A: STMicroelectronics, Analog Devices Inc., and Diodes Incorporated manufacture supervisor ICs with identical electrical specifications and package configurations. These parts meet the same functional requirements and are qualified as parametric equivalents based on voltage threshold, output type, reset logic, and timing parameters.

Q: What inventory considerations apply to part selection?

A: ADM811MARTZ-REEL7 offers the highest inventory availability (22115 pcs), followed by APX811-44UG-7 (26782 pcs) and MAX811MEUS+T (16772 pcs). MIC811MUY-TR provides Microchip continuity with 2590 pcs available. Inventory levels support production requirements across all substitute options.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MIC811MU TR is RoHS non-compliant. Compliance status is a key differentiator for new production and procurement applications.