MCP9509HT-E/OT Microchip Integrated Circuit (SOT23 (5-Pin)) In Stock
Microchip MCP9509HT-E/OT is a resistor-programmable temperature switch with open-drain output, trip-point accuracy of ±2°C, and supply range from 2.7 V to 5.5 V, housed in a 5-pin SOT-23 package for board-level thermal protection.
- Manufacturer
- Microchip
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- MCP9509HT-E/OT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.7820(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP9509HT-E/OT?
- Resistor-programmable trip-point temperature set with a single external resistor, eliminating the need for a microcontroller or I2C bus for thermal threshold configuration
- Open-drain output compatible with 3.3 V and 5 V logic levels, directly driving fan controllers, shutdown pins, or system alert inputs
- Supply voltage range of 2.7 V to 5.5 V with low quiescent current enabling always-on thermal monitoring in battery-powered equipment
- Compact 5-pin SOT-23 package covering a PCB footprint under 3 mm × 3 mm, suitable for tight board-level thermal protection placements
What is MCP9509HT-E/OT used for?
The MCP9509HT-E/OT is used for board-level over-temperature protection in power supplies, motor drivers, and battery chargers where a simple resistor-set trip point triggers a shutdown or cooling fan without firmware involvement. Its 2.7 V to 5.5 V supply range makes it compatible with both 3.3 V and 5 V system rails in industrial control panels and consumer electronics thermal guards. The SOT-23-5 package allows placement adjacent to hot components such as MOSFETs or voltage regulators to detect localized thermal events before they cause damage.
What are the specifications of MCP9509HT-E/OT?
| Manufacturer Package Code | SOT-23-5 |
| Factory Lead Time | 7Weeks |
| YTEOL | 9 |
| JESD-609 Code | e3 |
| Terminal Finish | Matte Tin (Sn) |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the MCP9509HT-E/OT datasheet?
MCP9509HT-E/OT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP9509HT-E/OT?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How is the trip-point temperature of the MCP9509HT-E/OT set in a circuit design?
The trip-point temperature is programmed by connecting a single external resistor between the RSET pin and ground; Microchip's datasheet provides a resistor-versus-temperature table covering the detection range from approximately -40°C to +125°C, allowing the threshold to be set with no firmware or serial interface required.
What is the temperature accuracy of the MCP9509HT-E/OT and how does it affect thermal protection margins?
The MCP9509HT-E/OT achieves a trip-point accuracy of ±2°C over its operating range, meaning designers must add at least a 2°C margin below the maximum allowable component temperature to ensure the protection fires before thermal damage occurs in power conversion or motor-drive circuits.
Can the open-drain output of MCP9509HT-E/OT directly interface with a 3.3 V microcontroller interrupt pin?
Yes, the open-drain output requires only a pull-up resistor (typically 10 kΩ to 100 kΩ) to the 3.3 V rail to produce a logic-level signal compatible with most microcontroller interrupt pins, allowing the MCU to respond to over-temperature events without additional level-shifting components.
In which applications does a resistor-programmable temperature switch like MCP9509HT-E/OT outperform a digital I2C temperature sensor?
The MCP9509HT-E/OT is preferable over an I2C temperature sensor when the design requires autonomous hardware-level thermal shutdown independent of software, or when no microcontroller is present, since the device asserts its output at the resistor-defined threshold with no firmware polling, reducing latency to under 1 second for reliable over-temperature protection.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.8840 | $0.88 |
| 500+ | $0.8810 | $440.50 |
| 1000+ | $0.8104 | $810.40 |
| 3000+ | $0.7938 | $2381.40 |
| 6000+ | $0.7820 | $4692.00 |
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