MIC811TU TR Equivalent & Substitute Parts

Part Overview

The MIC811TU TR is a single-channel power management supervisor IC manufactured by Microchip Technology, designed for reset and power-on reset applications in embedded systems. This device features push-pull totem pole output configuration and operates across the industrial temperature range of -40°C to 85°C. The part is currently classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production support. Substitute parts maintain core supervisory functionality while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC811TU TR
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Package / Case	TO-253-4, TO-253AA (SOT-143)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	3.08V
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
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MIC811TU TR is determined by strict adherence to the following critical parameters:

Primary Substitution Criteria:

Voltage threshold: 3.08V (exact match required)
Output configuration: Push-Pull, Totem Pole (for direct pin-compatible replacement)
Reset logic: Active Low
Reset timeout: 140ms minimum
Package: TO-253-4 or TO-253AA (SOT-143 or SOT-143-4)
Operating temperature: -40°C to 85°C minimum
Single-channel supervisor functionality

Substitution Categories:

Direct Manufacturer Equivalent (Same Microchip Base): MIC811TUY-TR maintains identical electrical specifications with improved RoHS3 compliance and active product status.

Parametric Equivalents (Push-Pull Output): ADM811-3TARTZ-RL7, ADM811TARTZ-REEL, ADM811TARTZ-REEL7, and APX811-31UG-7 provide identical threshold voltage, output type, reset timeout, and temperature range specifications. These parts are sourced from Analog Devices Inc. and Diodes Incorporated with active product status and RoHS3 compliance.

Functional Alternatives (Open Drain Output): ADM6315-31D2ARTZR7, ADM6315-31D3ARTZR7, MAX6805US31D1+T, and MAX6805US31D3+T offer equivalent threshold voltage and reset logic but feature open drain output configuration instead of push-pull. These require circuit design verification for output stage compatibility.

Cross-Manufacturer Direct Equivalent: STM811TW16F from STMicroelectronics provides identical electrical parameters with active status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Temp Range	Package	Product Status	RoHS Status
MIC811TU TR	Microchip Technology	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143	Obsolete	Non-compliant
MIC811TUY-TR	Microchip Technology	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143	Active	ROHS3 Compliant
STM811TW16F	STMicroelectronics	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143-4	Active	ROHS3 Compliant
ADM811-3TARTZ-RL7	Analog Devices Inc.	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143-4	Active	ROHS3 Compliant
ADM811TARTZ-REEL	Analog Devices Inc.	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143-4	Active	ROHS3 Compliant
ADM811TARTZ-REEL7	Analog Devices Inc.	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143-4	Active	ROHS3 Compliant
APX811-31UG-7	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-143	Active	ROHS3 Compliant
ADM6315-31D2ARTZR7	Analog Devices Inc.	3.08V	Open Drain	20ms Min	-40°C ~ 125°C	SOT-143-4	Active	ROHS3 Compliant
ADM6315-31D3ARTZR7	Analog Devices Inc.	3.08V	Open Drain	140ms Min	-40°C ~ 125°C	SOT-143-4	Active	ROHS3 Compliant
MAX6805US31D1+T	Analog Devices Inc./Maxim Integrated	3.08V	Open Drain	1ms Min	-40°C ~ 125°C	SOT-143-4	Active	ROHS3 Compliant
MAX6805US31D3+T	Analog Devices Inc./Maxim Integrated	3.08V	Open Drain	100ms Min	-40°C ~ 125°C	SOT-143-4	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, No Circuit Modification):

MIC811TUY-TR is the primary recommendation as the active equivalent from the original manufacturer. It maintains identical electrical specifications and package configuration while providing RoHS3 compliance and current production status. This part requires no design changes and offers the lowest integration risk.

STM811TW16F from STMicroelectronics provides an alternative direct replacement with identical performance specifications and active product status. Both parts are suitable for immediate substitution in existing designs.

For Push-Pull Output Requirement (Parametric Equivalents):

ADM811TARTZ-REEL and ADM811TARTZ-REEL7 from Analog Devices Inc. are parametric equivalents with the highest inventory availability (25,218 and 14,755 units respectively). These parts maintain identical threshold voltage, output configuration, reset timeout, and temperature specifications. APX811-31UG-7 from Diodes Incorporated offers equivalent performance with 7,930 units in stock.

All push-pull equivalents are RoHS3 compliant with active product status, suitable for new designs requiring compliance certification.

For Open Drain Output Applications:

ADM6315-31D3ARTZR7 is recommended when open drain output is acceptable in the circuit design. It maintains the 140ms reset timeout specification and provides extended temperature range (-40°C to 125°C). This part has 12,135 units in inventory.

MAX6805US31D3+T offers similar functionality with 100ms reset timeout and 12,100 units available. Both parts are RoHS3 compliant and actively produced.

Compliance Considerations:

All recommended substitutes are RoHS3 compliant, addressing the non-compliance status of the original MIC811TU TR. For applications requiring REACH compliance verification, all substitute parts maintain REACH Unaffected status. ECCN classification remains EAR99 across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can MIC811TUY-TR be used as a direct drop-in replacement for MIC811TU TR?

A: Yes. MIC811TUY-TR is the active production equivalent with identical electrical specifications, package configuration, and pin assignment. No circuit modifications are required. The primary difference is improved RoHS3 compliance and active product status.

Q: What is the difference between push-pull and open drain output configurations?

A: Push-pull output (totem pole) actively drives the output high and low through complementary transistor stages. Open drain output only actively pulls low; the high state requires an external pull-up resistor. The MIC811TU TR uses push-pull output. Substitutes with open drain output require circuit design verification to confirm pull-up resistor compatibility and output voltage levels.

Q: Are the ADM811 series parts pin-compatible with MIC811TU TR?

A: Yes. ADM811-3TARTZ-RL7, ADM811TARTZ-REEL, and ADM811TARTZ-REEL7 maintain identical pin configuration, voltage threshold, output type, and reset timeout. These parts are suitable for direct substitution in existing PCB layouts.

Q: Why do some substitutes have different reset timeout specifications?

A: Reset timeout variation reflects different internal timing circuit designs. ADM6315-31D2ARTZR7 specifies 20ms minimum, while ADM6315-31D3ARTZR7 specifies 140ms minimum. Selection depends on system requirements for power-on reset delay. The original MIC811TU TR requires 140ms minimum, so ADM6315-31D3ARTZR7 is the appropriate open drain alternative.

Q: Can I use MAX6805US31D1+T as a substitute if my circuit requires 140ms reset timeout?

A: No. MAX6805US31D1+T specifies 1ms minimum reset timeout, which does not meet the 140ms requirement of the original design. MAX6805US31D3+T with 100ms minimum timeout also falls short. Use ADM6315-31D3ARTZR7 or push-pull equivalents (ADM811 series, APX811-31UG-7) to maintain 140ms timing specification.

Q: What is the temperature range difference between MIC811TU TR and ADM6315 substitutes?

A: MIC811TU TR operates -40°C to 85°C. ADM6315 and MAX6805 series extend to -40°C to 125°C. This extended range provides additional margin for high-temperature applications but does not affect compatibility in designs operating within the original -40°C to 85°C specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 Compliant status. The original MIC811TU TR is RoHS non-compliant. Substitution addresses regulatory compliance requirements for new production and design updates.

Q: What packaging options are available for these substitutes?

A: All parts use SOT-143 or SOT-143-4 surface mount packages in TO-253-4 or TO-253AA case styles. Packaging format options (Cut Tape, Digi-Reel, Tape & Reel) vary by part number but do not affect electrical compatibility. Verify packaging format availability with your supplier for procurement requirements.

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