MIC809MUY-TR Equivalent & Substitute Parts

Part Overview

The MIC809MUY-TR is a single-channel power management supervisor IC manufactured by Microchip Technology, designed for power-on reset and simple reset applications. This SOT-23-3 surface mount device monitors a single voltage threshold at 4.38V and provides push-pull, totem pole output with active low reset functionality. The part is currently active in production with 1,044 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when extended temperature range operation is required, or when alternative packaging formats better suit manufacturing requirements.

Key Parameters

Parameter	MIC809MUY-TR
Manufacturer	Microchip Technology
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 Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 85°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MIC809MUY-TR is determined by the following critical parameters:

Voltage Threshold: Must be 4.38V
Output Configuration: Must be Push-Pull, Totem Pole
Reset Logic: Must be Active Low
Reset Timeout: Must be 140ms Minimum
Package / Case: Must be TO-236-3, SC-59, SOT-23-3 (SOT-23-3 package)
Mounting Type: Must be Surface Mount
Compliance: Must maintain ROHS3 compliance

All substitute parts listed below meet these core electrical and mechanical requirements. Variations in operating temperature range, reset timeout specifications above the minimum threshold, and packaging format (Tape & Reel vs. Cut Tape) do not affect functional substitutability for this application.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Logic	Reset Timeout	Operating Temperature	Package	Product Status
MIC809MUY-TR	Microchip Technology	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
TCM809MVNB713	Microchip Technology	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active
TCM809MENB713	Microchip Technology	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active
MAX6346UR44+T	Analog Devices Inc./Maxim Integrated	4.38V	Push-Pull, Totem Pole	Active Low	100ms Min	-40°C ~ 85°C	SOT-23-3	Active
MAX6801UR44D3+T	Analog Devices Inc./Maxim Integrated	4.38V	Push-Pull, Totem Pole	Active Low	100ms Min	-40°C ~ 125°C	SOT-23-3	Active
MAX809MEUR+T	Analog Devices Inc./Maxim Integrated	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active
APX809-44SAG-7	Diodes Incorporated	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs
APX809-44SRG-7	Diodes Incorporated	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Discontinued at DiGi Electronics
STM809MWX6F	STMicroelectronics	4.38V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility)

TCM809MVNB713 and TCM809MENB713 are Microchip Technology alternatives that maintain identical electrical specifications to the MIC809MUY-TR. TCM809MVNB713 offers extended temperature range operation to 125°C, making it suitable for applications requiring higher thermal performance. Both parts are ROHS3 compliant with unlimited moisture sensitivity rating.

MAX6801UR44D3+T from Analog Devices Inc./Maxim Integrated provides extended temperature range to 125°C and is actively produced with 20,200 units in stock. MAX809MEUR+T offers intermediate temperature range to 105°C. Both maintain full electrical equivalence and ROHS3 compliance.

STM809MWX6F from STMicroelectronics is an active alternative with identical specifications to the MIC809MUY-TR and ROHS3 compliance.

Secondary Substitutes (Limited Availability or Discontinued Status)

APX809-44SAG-7 from Diodes Incorporated meets all electrical requirements but carries "Not For New Designs" product status. APX809-44SRG-7 is discontinued at DiGi Electronics and should not be selected for new applications.

MAX6346UR44+T provides functional equivalence with a shorter reset timeout specification (100ms minimum versus 140ms minimum), which may be acceptable depending on application timing requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute MIC809MUY-TR with TCM809MVNB713?

A: Yes. Both parts share identical voltage threshold (4.38V), output configuration (push-pull, totem pole), reset logic (active low), and reset timeout (140ms minimum). TCM809MVNB713 extends the operating temperature range to 125°C, making it suitable for higher thermal environments. Both are ROHS3 compliant.

Q: What is the difference between the Microchip TCM809 variants?

A: TCM809MVNB713 operates from -40°C to 125°C, while TCM809MENB713 operates from -40°C to 85°C. Both maintain identical electrical specifications and are functionally interchangeable with MIC809MUY-TR. The primary difference is packaging format: TCM809MVNB713 is supplied in Tape & Reel, while TCM809MENB713 is supplied in Cut Tape & Digi-Reel format.

Q: Are Maxim Integrated MAX6801 and MAX6346 parts equivalent to MIC809MUY-TR?

A: Both parts meet the core substitution criteria: 4.38V threshold, push-pull totem pole output, active low reset, and SOT-23-3 package. However, both specify a 100ms minimum reset timeout compared to the 140ms minimum of MIC809MUY-TR. This shorter timeout may be acceptable for applications with less stringent reset timing requirements. MAX6801UR44D3+T offers extended temperature range to 125°C.

Q: Why is APX809-44SAG-7 marked "Not For New Designs"?

A: Parts with this status are still functionally equivalent and available in inventory (32,951 units), but the manufacturer has discontinued development and support. For new product designs, select from parts with "Active" product status such as TCM809MVNB713, MAX6801UR44D3+T, or STM809MWX6F.

Q: Does packaging format affect substitutability?

A: No. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel formats contain identical die and electrical specifications. The packaging format affects only handling and assembly processes, not functional performance or compatibility.

Q: Can I use MAX809MEUR+T as a substitute?

A: Yes. MAX809MEUR+T is functionally equivalent with identical voltage threshold, output configuration, and reset logic. It operates from -40°C to 105°C, providing intermediate temperature range between the standard -40°C to 85°C and extended -40°C to 125°C options. It is actively produced and ROHS3 compliant.

Q: What should I do if MIC809MUY-TR becomes unavailable?

A: Select from active alternatives with identical specifications: TCM809MVNB713 or TCM809MENB713 (Microchip), MAX6801UR44D3+T (Maxim), or STM809MWX6F (STMicroelectronics). All maintain full electrical and mechanical compatibility with the original part.

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