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MIC809MU-TR Equivalent & Substitute Parts
Part Overview
The MIC809MU-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 simple reset/power-on reset supervisor with push-pull, totem pole output configuration and a 4.38V voltage threshold. The MIC809MU-TR is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain the same electrical and mechanical specifications for continued system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | MIC809MU-TR Specification |
|---|---|
| Manufacturer | Microchip Technology |
| Category | Power Management (PMIC) |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Type | Simple Reset/Power-On Reset |
| Number of Voltages Monitored | 1 |
| Voltage - Threshold | 4.38V |
| Output | 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
Substitute parts for the MIC809MU-TR are classified based on strict adherence to the following critical parameters:
Primary Substitution Criteria:
- Voltage threshold: 4.38V
- Output type: Push-Pull, Totem Pole
- Reset polarity: Active Low
- Reset timeout: 140ms Minimum
- Package: SOT-23-3 (TO-236-3, SC-59)
- Mounting type: Surface Mount
- Number of channels: 1
- Supervisor type: Simple Reset/Power-On Reset
Grouping Logic:
Group 1 - Direct Functional Equivalents (Microchip Technology): Parts that maintain identical electrical specifications and are manufactured by Microchip Technology with active product status.
Group 2 - Cross-Manufacturer Equivalents: Parts from alternative manufacturers (Texas Instruments, STMicroelectronics, Analog Devices Inc./Maxim Integrated, Diodes Incorporated) that meet all critical electrical and mechanical parameters.
Group 3 - Extended Temperature Range Variants: Parts with identical core specifications but extended operating temperature ranges, suitable for applications requiring higher temperature operation.
Group 4 - Discontinued or Limited Availability: Parts with matching specifications but discontinued or not-for-new-designs status, listed for reference only.
Parameter Comparison
| Part Number | Manufacturer | Voltage Threshold | Output Type | Reset Timeout (Min) | Operating Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| MIC809MU-TR | Microchip Technology | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 85°C | SOT-23-3 | Discontinued at DiGi Electronics | RoHS non-compliant |
| TCM809MVNB713 | Microchip Technology | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 125°C | SOT-23-3 | Active | ROHS3 Compliant |
| TCM809MENB713 | Microchip Technology | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 85°C | SOT-23-3 | Active | ROHS3 Compliant |
| STM809MWX6F | STMicroelectronics | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 85°C | SOT-23-3 | Active | ROHS3 Compliant |
| LM809M3-4.38/NOPB | Texas Instruments | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 105°C | SOT-23-3 | Active | ROHS3 Compliant |
| MAX6801UR44D3+T | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | 100ms | -40°C ~ 125°C | SOT-23-3 | Active | ROHS3 Compliant |
| MAX809MEUR+T | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 105°C | SOT-23-3 | Active | ROHS3 Compliant |
| MAX6346UR44+T | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | 100ms | -40°C ~ 85°C | SOT-23-3 | Active | ROHS3 Compliant |
| APX809-44SAG-7 | Diodes Incorporated | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 85°C | SOT-23-3 | Not For New Designs | ROHS3 Compliant |
| APX809-44SRG-7 | Diodes Incorporated | 4.38V | Push-Pull, Totem Pole | 140ms | -40°C ~ 85°C | SOT23R | Discontinued at DiGi Electronics | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation - Microchip Technology TCM809MENB713: The TCM809MENB713 is the direct parametric equivalent to the MIC809MU-TR, maintaining identical electrical specifications including 4.38V threshold, 140ms reset timeout, and SOT-23-3 package. This part is active with ROHS3 compliance and identical operating temperature range to the original part. Selection of this part ensures seamless drop-in replacement with no circuit modifications required.
Extended Temperature Alternative - Microchip Technology TCM809MVNB713: For applications requiring extended operating temperature range to 125°C, the TCM809MVNB713 provides identical electrical specifications with expanded thermal capability. ROHS3 compliance and active product status support long-term availability.
Cross-Manufacturer Alternatives: The MAX809MEUR+T (Analog Devices Inc./Maxim Integrated) and LM809M3-4.38/NOPB (Texas Instruments) maintain all critical electrical parameters with 140ms reset timeout and 4.38V threshold. Both are active products with ROHS3 compliance. The MAX809MEUR+T supports operating temperatures to 105°C, while the LM809M3-4.38/NOPB extends to 105°C as well.
The STM809MWX6F (STMicroelectronics) provides an alternative with identical specifications, active status, and ROHS3 compliance.
Reset Timeout Consideration: The MAX6801UR44D3+T and MAX6346UR44+T feature 100ms minimum reset timeout, which differs from the 140ms specification of the MIC809MU-TR. These parts are suitable only for applications where the shorter reset timeout is acceptable.
Discontinued Parts: The APX809-44SAG-7 and APX809-44SRG-7 (Diodes Incorporated) meet electrical specifications but carry discontinued or not-for-new-designs status. These are not recommended for new designs or long-term production applications.
RoHS Compliance: The original MIC809MU-TR is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, providing improved environmental and regulatory alignment for new designs and production continuity.
Frequently Asked Questions (FAQ)
Q: Can the TCM809MENB713 replace the MIC809MU-TR directly without circuit modifications?
A: Yes. The TCM809MENB713 maintains identical electrical specifications including voltage threshold (4.38V), output type (push-pull, totem pole), reset polarity (active low), reset timeout (140ms minimum), and package (SOT-23-3). No circuit modifications are required for direct substitution.
Q: What is the difference between the TCM809MVNB713 and TCM809MENB713?
A: Both parts are manufactured by Microchip Technology with identical electrical specifications. The primary difference is operating temperature range: TCM809MVNB713 operates from -40°C to 125°C, while TCM809MENB713 operates from -40°C to 85°C. Select TCM809MVNB713 for applications requiring extended high-temperature operation.
Q: Why do some substitute parts have 100ms reset timeout instead of 140ms?
A: The MAX6801UR44D3+T and MAX6346UR44+T feature different reset timeout specifications (100ms minimum versus 140ms minimum). These parts are suitable only for applications where the shorter reset timeout meets system requirements. Verify timing requirements before selection.
Q: Are all recommended substitutes RoHS compliant?
A: All active substitute parts listed are ROHS3 compliant. The original MIC809MU-TR is RoHS non-compliant. For new designs and production applications requiring RoHS compliance, select from the active, ROHS3-compliant alternatives.
Q: Can I use cross-manufacturer parts such as the MAX809MEUR+T or LM809M3-4.38/NOPB?
A: Yes. The MAX809MEUR+T (Analog Devices Inc./Maxim Integrated) and LM809M3-4.38/NOPB (Texas Instruments) maintain all critical electrical parameters and are active products with ROHS3 compliance. Cross-manufacturer substitution is valid when all electrical and mechanical specifications align with system requirements.
Q: What is the difference between SOT-23-3 and SOT23R packages?
A: Both are surface mount packages with identical pinout and electrical compatibility. SOT-23-3 is the standard designation; SOT23R is a variant designation used by some manufacturers. The APX809-44SRG-7 uses SOT23R designation but maintains mechanical and electrical compatibility with SOT-23-3 footprints.
Q: Should I use parts marked "Not For New Designs"?
A: Parts with "Not For New Designs" status (such as APX809-44SAG-7) are not recommended for new product development. These parts are suitable only for legacy system support or maintenance applications where existing inventory is available. For new designs, select from active product status alternatives.
Q: How do I verify compatibility before implementing a substitute part?
A: Confirm that the substitute part matches the following critical parameters: voltage threshold (4.38V), output type (push-pull, totem pole), reset polarity (active low), reset timeout (140ms minimum or shorter if acceptable), and package (SOT-23-3). Verify operating temperature range meets application requirements. Consult manufacturer datasheets for detailed electrical characteristics and timing specifications.
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