MIC809RU-TR Equivalent & Substitute Parts

Part Overview

The MIC809RU-TR is a single-channel power management supervisor IC manufactured by Microchip Technology, housed in a SOT-23-3 surface mount package. This device functions as a push-pull, totem pole reset supervisor with active-low output and a 2.63V threshold voltage. The MIC809RU-TR is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across voltage monitoring, reset timing, output topology, and thermal operating ranges.

Key Parameters

Parameter	MIC809RU-TR
Manufacturer	Microchip Technology
Package / Case	TO-236-3, SC-59, SOT-23-3
Voltage - Threshold	2.63V
Output Type	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Voltage Threshold: Must be 2.63V
Output Configuration: Must be push-pull, totem pole topology
Reset Logic: Must be active low
Reset Timeout: Must be 140ms minimum
Package: Must be SOT-23-3 or SC-70-3 (mechanically compatible surface mount packages)
Operating Temperature Range: Must support at least -40°C to 85°C
Mounting Type: Must be surface mount

Substitute parts are categorized as follows:

MFR Recommended Substitutes (Microchip Technology active alternatives): TCM809RVNB713, TCM809RVLB713

Parametric Equivalents (Alternative manufacturers, identical electrical specifications): TCM809RENB713, STM809RWX6F, MAX6326UR26+T, MAX809REUR+T, APX809-26SAG-7, APX809-26SRG-7, CAT809RTBI-GT3, ISL88001IH26Z-TK

Parameter Comparison

Part Number	Manufacturer	Package	Voltage Threshold	Output Type	Reset Timeout	Operating Temp	Product Status	RoHS Status
MIC809RU-TR	Microchip Technology	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Discontinued	RoHS non-compliant
TCM809RVNB713	Microchip Technology	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	Active	ROHS3 Compliant
TCM809RVLB713	Microchip Technology	SC-70-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	Active	ROHS3 Compliant
TCM809RENB713	Microchip Technology	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Active	ROHS3 Compliant
STM809RWX6F	STMicroelectronics	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX6326UR26+T	Analog Devices Inc./Maxim Integrated	SOT-23-3	2.63V	Push-Pull, Totem Pole	100ms Min	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX809REUR+T	Analog Devices Inc./Maxim Integrated	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C	Active	ROHS3 Compliant
APX809-26SAG-7	Diodes Incorporated	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Not For New Designs	ROHS3 Compliant
APX809-26SRG-7	Diodes Incorporated	SOT23R	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Active	ROHS3 Compliant
CAT809RTBI-GT3	onsemi	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
ISL88001IH26Z-TK	Renesas Electronics Corporation	SOT-23-3	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TCM809RVNB713 (Microchip Technology)

TCM809RVNB713 is the direct Microchip successor to MIC809RU-TR, maintaining identical electrical specifications while offering extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and ROHS3 compliance. This part is actively manufactured and widely available, making it the optimal choice for direct replacement in existing designs.

Alternative Recommendation: MAX809REUR+T (Analog Devices Inc./Maxim Integrated)

MAX809REUR+T provides full electrical compatibility with identical 2.63V threshold, 140ms reset timeout, and push-pull totem pole output. This part supports an extended operating temperature range (-40°C to 105°C) and maintains ROHS3 compliance. High inventory availability (66,118 units) ensures supply continuity.

Secondary Recommendation: STM809RWX6F (STMicroelectronics)

STM809RWX6F matches all critical electrical parameters and operates within the original temperature range (-40°C to 85°C). ROHS3 compliance and active product status support long-term availability.

Not Recommended for New Designs: APX809-26SAG-7 (Diodes Incorporated) is marked "Not For New Designs" and should be avoided in new applications despite parametric equivalence.

Not Recommended: CAT809RTBI-GT3 (onsemi) is obsolete and should not be selected for new or ongoing production.

Package Consideration: TCM809RVLB713 uses SC-70-3 packaging instead of SOT-23-3. While electrically equivalent, this package variant requires PCB layout modification and is not a direct mechanical substitute.

Frequently Asked Questions (FAQ)

Q: Can I use MAX6326UR26+T as a direct replacement for MIC809RU-TR?

A: MAX6326UR26+T meets all electrical requirements except reset timeout. It specifies 100ms minimum reset timeout versus the 140ms minimum of MIC809RU-TR. This difference may affect system startup timing and should be evaluated against application requirements.

Q: What is the difference between TCM809RVNB713 and TCM809RENB713?

A: Both are Microchip alternatives with identical electrical specifications and SOT-23-3 packaging. TCM809RVNB713 is supplied in Tape & Reel (TR) packaging, while TCM809RENB713 is supplied in Cut Tape (CT) & Digi-Reel format. Inventory availability differs significantly (3,085 units versus 158,754 units). Select based on packaging requirements and supply availability.

Q: Is APX809-26SRG-7 compatible with MIC809RU-TR?

A: APX809-26SRG-7 is electrically equivalent but uses SOT23R packaging instead of SOT-23-3. While mechanically similar, this variant may require PCB layout verification. The part is actively manufactured and ROHS3 compliant.

Q: Why is MIC809RU-TR discontinued?

A: The original MIC809RU-TR is RoHS non-compliant. Microchip replaced it with ROHS3-compliant variants (TCM809 series) that maintain electrical compatibility while meeting current environmental regulations.

Q: Can I substitute parts with different operating temperature ranges?

A: Substitution is permissible only if the alternative part's operating temperature range encompasses the original specification. For example, TCM809RVNB713 (-40°C to 125°C) is acceptable for MIC809RU-TR (-40°C to 85°C) applications. Conversely, using a part with a narrower range may introduce reliability risks.

Q: What does "Push-Pull, Totem Pole" output mean?

A: This output configuration provides both high-side and low-side drive capability, allowing the supervisor to actively pull the reset line high or low. All listed substitutes maintain this topology, ensuring functional compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All active and recommended substitute parts are ROHS3 compliant. The original MIC809RU-TR is RoHS non-compliant. CAT809RTBI-GT3 is ROHS3 compliant but obsolete. APX809-26SAG-7 is ROHS3 compliant but marked "Not For New Designs."

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