MCP9801-M/SN Microchip Integrated Circuit (Small Outline Packages) In Stock
The MCP9801-M/SN is a high-accuracy 12-bit digital temperature sensor from Microchip with a 2-wire I2C serial interface. It measures temperature with up to ±1°C accuracy in typical conditions and a maximum error of ±3°C, packaged in an SOIC-8. Ideal for thermal management, overcurrent detection, and environmental monitoring in industrial and consumer systems.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP9801-M/SN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5200(MOQ 1)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP9801-M/SN?
- 12-bit temperature resolution providing 0.0625°C step size for precise monitoring
- Maximum accuracy of ±3°C across the full operating temperature range
- I2C/SMBus 2-wire serial interface minimizing microcontroller wiring to 2 signal lines
- Programmable alert output for autonomous over-temperature interrupt without MCU polling
- SOIC-8 plastic package with 4.89 mm x 3.9 mm body footprint for compact PCB integration
What is MCP9801-M/SN used for?
The MCP9801-M/SN is used in embedded systems for thermal protection of processors, power supplies, and battery packs, where 12-bit temperature data over I2C allows the host MCU to implement fan speed control or thermal throttling algorithms. It suits HVAC control units, data logger boards, and industrial field devices requiring accurate ±3°C temperature measurement without calibration. The programmable alert threshold output enables standalone over-temperature shutdown circuits that trigger independently of software execution.
What are the specifications of MCP9801-M/SN?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOIC-8 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Accuracy-Max (Cel) | 3Cel |
| Body Breadth | 3.9mm |
| Body Height | 1.72mm |
| Body Length or Diameter | 4.89mm |
| Housing | PLASTIC |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Number of Bits | 12 |
| Operating Current-Max | 0.2mA |
| Output Interface Type | 2-WIRE INTERFACE |
| Output Voltage-Min | 0.4V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape/Style | RECTANGULAR |
| Sensors/Transducers Type | TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 2.7V |
| Surface Mount | YES |
| Terminal Finish | Matte Tin (Sn) |
| Termination Type | SOLDER |
| ## MCP9801-M/SN Alternates Showing results | Image |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Mainland China, Thailand |
Where can I find the MCP9801-M/SN datasheet?
MCP9801-M/SN Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP9801-M/SN?
Compatible alternatives and drop-in replacements for MCP9801-M/SN:
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Frequently Asked Questions
What temperature resolution does the MCP9801-M/SN provide at its highest precision setting, and how many bits does that require?
At its maximum 12-bit resolution setting, the MCP9801-M/SN resolves temperature changes of 0.0625°C per LSB. This fine granularity is sufficient for fan speed control algorithms and thermal throttling systems that must react to less than 1°C variations around a thermal limit setpoint.
How does the MCP9801-M/SN's alert pin reduce microcontroller CPU load in a thermal protection system?
The programmable over-temperature alert output asserts as an interrupt when the measured temperature crosses a user-configured threshold register. The microcontroller can sleep or perform other tasks and only wakes on the interrupt, eliminating the need to poll the sensor over I2C every few milliseconds. This saves dozens of microcontroller cycles per second and can reduce average current consumption by several tens of microamperes in low-power designs.
How many I2C address options does the MCP9801-M/SN support, allowing multiple sensors on the same bus?
The MCP9801-M/SN supports up to 8 unique I2C addresses selectable via 3 address pins (A0, A1, A2), allowing up to 8 independent MCP9801 sensors to share a single 2-wire I2C bus simultaneously. This is useful in multi-zone thermal monitoring systems such as server boards or battery packs where 8 distinct temperature measurement points are needed without adding additional bus wiring.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.7200 | $0.72 |
| 25+ | $0.5430 | $13.58 |
| 100+ | $0.5400 | $54.00 |
| 1000+ | $0.5300 | $530.00 |
| 5000+ | $0.5200 | $2600.00 |
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