MCP1321T-29LE/OT Microchip Integrated Circuit (SOT23 (5-Pin)) In Stock
The MCP1321T-29LE/OT is a Microchip single-channel 2.90 V voltage supervisor and reset IC in a SOT-23-5 package, providing a fixed threshold with an active-low reset output and low quiescent current for reliable power-on reset and brownout detection. Designed to guarantee MCU reset integrity during supply undervoltage conditions. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- MCP1321T-29LE/OT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6100(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP1321T-29LE/OT?
- Fixed 2.90 V threshold voltage supervisor with active-low open-drain reset output ensures reliable MCU reset during power-up and brownout conditions without external voltage dividers
- Ultralow quiescent current consumption in SOT-23-5 package minimises standby power impact in battery-operated and always-on embedded systems
- Extended operating range and E-grade (-40°C to +125°C) temperature qualification supports automotive and industrial designs requiring robust power-on reset across wide temperature swings
What is MCP1321T-29LE/OT used for?
The MCP1321T-29LE/OT is used to supervise the supply rail of microcontrollers and FPGAs in embedded systems, asserting a reset signal whenever the VCC drops below the 2.90 V threshold to prevent undefined MCU behaviour during power-up, brownout, or supply glitches. It is particularly suitable for 3.3 V MCU designs where the minimum operating voltage of the processor is close to 2.9 V, such as PIC, AVR, and ARM Cortex-M0 devices running from coin-cell or LiPo batteries. The tiny SOT-23-5 footprint makes it the preferred choice for space-constrained wearable, IoT sensor node, and automotive body control module designs.
What are the specifications of MCP1321T-29LE/OT?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-5 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSOP5/6,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 0.01mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1V |
| Supply Voltage-Nom (Vsup) | 1.5V |
| Surface Mount | YES |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +2.9V |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia, Thailand |
Where can I find the MCP1321T-29LE/OT datasheet?
MCP1321T-29LE/OT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP1321T-29LE/OT?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what supply voltage does the MCP1321T-29LE/OT assert its reset output, and what logic level does it drive?
The MCP1321T-29LE/OT asserts an active-low reset signal when the monitored VCC supply falls below the fixed 2.90 V threshold. The reset output is an open-drain stage that pulls the RESET pin low, requiring a pull-up resistor to the logic supply rail (typically 10 kohm to 100 kohm) to interface with MCU reset inputs.
What is the operating temperature range of the MCP1321T-29LE/OT, and in which application environments is it qualified?
The E-grade suffix on MCP1321T-29LE/OT indicates an extended industrial temperature range of -40°C to +125°C, which covers automotive underhood, industrial outdoor, and harsh-environment embedded control applications. This rating exceeds the -20°C to +85°C commercial range and ensures the 2.90 V threshold remains within specified accuracy across the full temperature span.
How does the MCP1321T-29LE/OT differ from an adjustable threshold supervisor, and when is a fixed-threshold device preferred?
The MCP1321T-29LE/OT uses a factory-programmed 2.90 V fixed threshold requiring no external resistor divider, reducing component count by 2 resistors and eliminating divider mismatch errors. Adjustable supervisors offer flexibility for non-standard voltages but add two precision resistors (typically 1% tolerance) and the associated layout area; the fixed-threshold device is preferred when the monitored rail is a standard 3.0 V or 3.3 V and PCB space is at a premium.
What reset timeout delay does the MCP1321T-29LE/OT provide, and why is a timeout important for capacitive supply rails?
The MCP1321T-29LE/OT incorporates a minimum reset timeout period of approximately 100 ms after VCC rises back above the 2.90 V threshold before de-asserting the reset signal. This delay allows the supply rail to fully stabilise and bulk capacitors (typically 10 µF to 100 µF) to charge completely, preventing premature MCU startup during slow ramp power-on sequences common in energy-harvesting or coin-cell powered designs.
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