MIC809JU-TR Equivalent & Substitute Parts

Part Overview

The MIC809JU-TR is a single-channel power management supervisor IC manufactured by Microchip Technology, designed for reset and power-on reset applications. This part operates with a 4V threshold voltage and delivers push-pull, totem pole output in a SOT-23-3 surface mount package. The MIC809JU-TR is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain the same electrical functionality while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	4V
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 / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MIC809JU-TR is determined by strict equivalence across the following critical parameters: single-channel voltage monitoring, 4V threshold voltage, push-pull totem pole output, active low reset logic, 140ms minimum reset timeout, and surface mount packaging in SOT-23-3 or compatible form factors. Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes (Microchip Technology): Parts from the same manufacturer with identical electrical specifications and active product status, offering direct replacement capability.

Manufacturer Recommended Substitutes (Microchip Technology TCM809 Series): Parts from Microchip Technology with enhanced operating temperature ranges (-40°C ~ 125°C) and improved compliance status, available in alternative package options (SC-70-3 and SOT-23-3).

Parametric Equivalents (Cross-Manufacturer): Parts from Analog Devices Inc./Maxim Integrated and Diodes Incorporated that meet all electrical and functional requirements with identical threshold voltage, output configuration, and reset characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Operating Temp Range	Package	Product Status	RoHS Status
MIC809JU-TR	Microchip Technology	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Discontinued	RoHS non-compliant
MIC809JUY-TR	Microchip Technology	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
TCM809JVLB713	Microchip Technology	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	SC-70-3	Active	ROHS3 Compliant
TCM809JVNB713	Microchip Technology	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	ROHS3 Compliant
TCM809JENB713	Microchip Technology	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	ROHS3 Compliant
MAX809JEUR+T	Analog Devices Inc./Maxim Integrated	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	ROHS3 Compliant
APX809-40SAG-7	Diodes Incorporated	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	ROHS3 Compliant
APX809-40SRG-7	Diodes Incorporated	4V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT23R	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Active Status: MIC809JUY-TR provides the most direct substitution path, maintaining identical electrical specifications and SOT-23-3 packaging while offering active product status and ROHS3 compliance. This part is recommended for applications requiring minimal design changes.

For Enhanced Temperature Range Applications: TCM809JVNB713 extends the operating temperature range to -40°C ~ 125°C while maintaining SOT-23-3 packaging and active product status. This part is suitable for applications requiring broader thermal performance. TCM809JVLB713 offers the same temperature range in SC-70-3 packaging for space-constrained designs.

For Parametric Equivalence Across Manufacturers: MAX809JEUR+T from Analog Devices Inc./Maxim Integrated meets all electrical requirements with an operating range of -40°C ~ 105°C and active product status. This part is suitable for applications where cross-manufacturer sourcing is acceptable.

For Legacy System Maintenance: APX809-40SAG-7 and APX809-40SRG-7 from Diodes Incorporated provide parametric equivalence but carry "Not For New Designs" status. These parts are suitable only for maintaining existing systems where no alternative is available.

All recommended substitutes carry ROHS3 compliance, addressing the non-compliant status of the original MIC809JU-TR.

Frequently Asked Questions (FAQ)

Q: Can MIC809JUY-TR be used as a direct replacement for MIC809JU-TR?

A: Yes. MIC809JUY-TR maintains identical electrical specifications, threshold voltage (4V), output configuration (push-pull totem pole), reset timeout (140ms minimum), and SOT-23-3 packaging. The primary differences are active product status and ROHS3 compliance.

Q: What is the difference between TCM809JVNB713 and TCM809JENB713?

A: Both parts are Microchip Technology supervisors with 4V threshold and SOT-23-3 packaging. TCM809JVNB713 operates across -40°C ~ 125°C, while TCM809JENB713 operates across -40°C ~ 85°C. Select TCM809JVNB713 for applications requiring extended high-temperature performance.

Q: Is TCM809JVLB713 compatible with designs using SOT-23-3 packages?

A: TCM809JVLB713 uses SC-70-3 packaging, which is physically different from SOT-23-3. While electrically equivalent, PCB layout modifications are required. Use this part only if SC-70-3 footprints are available or if board redesign is acceptable.

Q: Can MAX809JEUR+T be used in applications requiring -40°C ~ 125°C operation?

A: MAX809JEUR+T operates across -40°C ~ 105°C, which does not meet the full -40°C ~ 125°C range. For applications requiring -40°C ~ 125°C operation, use TCM809JVNB713 or TCM809JVLB713.

Q: Why are APX809-40SAG-7 and APX809-40SRG-7 marked "Not For New Designs"?

A: These Diodes Incorporated parts carry "Not For New Designs" status, indicating they are in end-of-life phases. They remain available for legacy system support but should not be selected for new product development. Prefer active alternatives such as MIC809JUY-TR, TCM809 series, or MAX809JEUR+T.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance. The original MIC809JU-TR is RoHS non-compliant. Substitution addresses this compliance gap for new production runs.

Q: What packaging options are available for 4V threshold supervisors?

A: Available packages include SOT-23-3 (MIC809JUY-TR, TCM809JVNB713, TCM809JENB713, MAX809JEUR+T, APX809-40SAG-7), SC-70-3 (TCM809JVLB713), and SOT23R (APX809-40SRG-7). Select based on PCB footprint requirements and thermal performance needs.

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