MIC811RU TR Equivalent & Substitute Parts

Part Overview

The MIC811RU 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 2.63V voltage threshold and 140ms minimum reset timeout. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in reset supervision, voltage monitoring, and output drive characteristics while meeting current RoHS and REACH compliance standards.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	2.63V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package	TO-253-4, TO-253AA (SOT-143)
RoHS Status	RoHS non-compliant (Obsolete)
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MIC811RU TR is determined by the following critical parameters:

Mandatory Matching Parameters:

Single-channel voltage monitoring
2.63V voltage threshold (±tolerance)
Active Low reset logic
Surface mount SOT-143 package footprint compatibility
Moisture Sensitivity Level 1

Output Configuration Consideration: The MIC811RU TR features push-pull totem pole output. Direct substitutes with identical push-pull output are limited to the MIC811RUY-TR (Microchip) and STM811RW16F (STMicroelectronics). These maintain 100% functional equivalence for applications requiring active high and active low drive capability.

Extended Substitutes with Output Variation: Parts with open drain or open collector output (ADM6315 series, MAX6444US26L+T, MAX6805US26D3+T, STM6315 series) are functionally compatible in applications where pull-up resistors are implemented. These parts share identical voltage threshold, reset timeout, and package specifications but differ in output drive topology. Selection depends on circuit design requirements.

Compliance Status: The original MIC811RU TR is RoHS non-compliant and obsolete. All substitute parts listed are RoHS3 compliant and active products, meeting current regulatory requirements for new designs and production.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout (Min)	Operating Temp	Package	RoHS Status	Product Status
MIC811RU TR	Microchip Technology	2.63V	Push-Pull, Totem Pole	140ms	-40°C ~ 85°C	SOT-143	Non-compliant	Obsolete
MIC811RUY-TR	Microchip Technology	2.63V	Push-Pull, Totem Pole	140ms	-40°C ~ 85°C	SOT-143	ROHS3 Compliant	Active
STM811RW16F	STMicroelectronics	2.63V	Push-Pull, Totem Pole	140ms	-40°C ~ 85°C	SOT-143-4	ROHS3 Compliant	Active
ADM6315-26D1ARTZR7	Analog Devices Inc.	2.63V	Open Drain/Open Collector	1ms	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active
ADM6315-26D2ARTZR7	Analog Devices Inc.	2.63V	Open Drain/Open Collector	20ms	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active
ADM6315-26D3ARTZR7	Analog Devices Inc.	2.63V	Open Drain/Open Collector	140ms	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active
ADM6315-26D4ARTZR7	Analog Devices Inc.	2.63V	Open Drain/Open Collector	1.12s	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active
MAX6444US26L+T	Analog Devices Inc./Maxim Integrated	2.625V	Open Drain/Open Collector	140ms	-40°C ~ 85°C	SOT-143-4	ROHS3 Compliant	Active
MAX6805US26D3+T	Analog Devices Inc./Maxim Integrated	2.63V	Open Drain/Open Collector	100ms	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active
STM6315RBW13F	STMicroelectronics	2.63V	Open Drain/Open Collector	20ms	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active
STM6315RDW13F	STMicroelectronics	2.63V	Open Drain/Open Collector	112ms	-40°C ~ 125°C	SOT-143-4	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Replacement (100% Functional Equivalence): MIC811RUY-TR is the primary direct replacement, offering identical electrical specifications and push-pull output topology. This part maintains backward compatibility with existing circuit designs without modification. STM811RW16F from STMicroelectronics provides equivalent functionality with active product status and extended temperature range capability (-40°C ~ 85°C).

Compliant Alternatives with Output Topology Change: For applications where circuit design permits open drain output configuration, the ADM6315-26D3ARTZR7 offers 140ms reset timeout matching the original specification with extended operating temperature range (-40°C ~ 125°C). The MAX6444US26L+T provides equivalent 140ms timeout with voltage threshold of 2.625V, suitable for applications with ±1.9% threshold tolerance. STM6315RDW13F delivers 112ms reset timeout, acceptable for designs with flexible timeout requirements.

Selection Criteria:

Choose MIC811RUY-TR or STM811RW16F for designs requiring push-pull output without circuit modification
Choose ADM6315-26D3ARTZR7 or MAX6444US26L+T for designs with pull-up resistor implementation and extended temperature operation
All listed substitutes meet current RoHS3 compliance and REACH requirements
Verify reset timeout tolerance in application-specific circuit requirements before final selection

Frequently Asked Questions (FAQ)

Q: Can I use an open drain output part as a direct replacement for the push-pull MIC811RU TR? A: Open drain substitutes require external pull-up resistors to function as active high drivers. If your circuit already includes pull-up resistors, open drain parts are compatible. If your circuit relies on active high drive from the supervisor output, push-pull alternatives (MIC811RUY-TR or STM811RW16F) are required.

Q: What is the difference between the reset timeout specifications across substitute parts? A: Reset timeout defines the minimum duration the reset output remains asserted after power supply stabilization. The MIC811RU TR specifies 140ms minimum. Substitutes range from 1ms to 1.12s. Select a part with reset timeout equal to or greater than your application requirement. Shorter timeouts may cause premature reset release; longer timeouts provide additional margin.

Q: Are all substitute parts pin-compatible with the MIC811RU TR? A: All listed substitutes use SOT-143 or SOT-143-4 packages with identical pinout for single-channel supervisor applications. PCB footprints are compatible. Verify specific pin assignments in device datasheets before assembly.

Q: Why is the MIC811RU TR obsolete, and what does this mean for my design? A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may be available through authorized distributors, but long-term supply is not guaranteed. Transitioning to active products (MIC811RUY-TR, STM811RW16F, or ADM6315 series) ensures supply chain continuity for future production runs.

Q: Do all substitute parts meet RoHS compliance? A: Yes. All listed substitute parts are RoHS3 compliant, meeting current regulatory requirements. The original MIC811RU TR is RoHS non-compliant due to its obsolete status. New designs must use RoHS3 compliant alternatives.

Q: Can I use a substitute with extended temperature range (-40°C ~ 125°C) in place of the -40°C ~ 85°C specification? A: Yes. Extended temperature range parts are suitable for applications with standard temperature requirements. This provides additional design margin and operational flexibility. Verify that your application does not require the specific -40°C ~ 85°C range limitation before substitution.

Q: What is Moisture Sensitivity Level (MSL) 1, and why is it important? A: MSL 1 indicates unlimited shelf life without moisture absorption concerns. All listed parts maintain MSL 1, ensuring consistent handling and storage requirements across substitutions.

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