Microchip Technology MCP9904T-1E/9Q — Discrete Semiconductors
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RoHS Compliant · Lead-Free EIA-481 Standard
Microchip Technology / Discrete Semiconductors

MCP9904T-1E/9Q Digital Temp Sensor, ±1°C, I²C/SMBus, Active

MPN MCP9904T-1E/9Q
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Microchip MCP9904T-1E/9Q digital temperature sensor, local/remote, I²C/SMBus output, ±1°C (±2°C) accuracy, 3V to 3.6V supply, -40°C to 125°C operating range, 10-VFDFN exposed-pad package, Tape & Reel.

In Stock: 3,551 pcs
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[SPEC] Essential Parameters Snapshot Full Specifications (12)
Package / Case 10-VFDFN Exposed Pad
Supply Voltage 3V ~ 3.6V

Full Technical Specifications

12 Parameters
MCP9904T-1E/9Q specifications
Parameter / AttributeSpecification / Value
Output typeI²C/SMBus
Sensor typeDigital, Local/Remote
MountingSurface Mount
Supply voltage3V ~ 3.6V
Operating temperature-40°C ~ 125°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesOne-Shot, Programmable Limit, Sleep Mode, Standby Mode
Case10-VFDFN Exposed Pad
Test condition-40°C ~ 65°C (-40°C ~ 125°C)
Accuracy - highest (Lowest)±1°C (±2°C)
Sensing temperature - local-40°C ~ 125°C
Sensing temperature - remote-40°C ~ 125°C
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Technical Details & Description

Active production — no redesign clock ticking

ROHS3 compliant per the listing, which matches the lead-free assembly requirements for most commercial and industrial builds.

Accuracy and temperature range — the fit decision

That ±2°C ceiling at the temperature extremes is the number to budget for in a thermal-shutdown or fan-control loop — if the system trip point is 105°C, the sensor could report 103°C or 107°C at the high end, so set the threshold with that window in mind. Both local and remote sensing channels cover the same -40°C to 125°C span, so a single part can monitor the die temperature and an external diode-connected transistor (e.g., a CPU or FPGA thermal diode) without a second IC.

Supply rail and bus interface

Operates from 3V to 3.6V — a tight 3.3V nominal rail. No 5V tolerance on the supply, so if the system runs a 5V bus, a local 3.3V LDO or a level shifter on the I²C/SMBus lines is required. The digital output is I²C/SMBus, which is the standard for board management controllers and BMCs.

Package and layout — the exposed paddle matters

Housed in a 10-VFDFN with exposed pad, 3x3 mm body (supplier device package 10-VDFN). The perimeter pads are fine-pitch; a solder-paste stencil aperture that is 80% of the pad width avoids bridging during reflow.

Feature set for system integration

Includes one-shot conversion, programmable temperature limit, sleep mode, and standby mode. The one-shot feature lets the host take a single measurement then put the part back into low-power state — useful in battery-powered or duty-cycled systems where continuous conversion draws unnecessary current.

Frequently asked questions

What is the accuracy of MCP9904T-1E/9Q?

The ±2°C figure is the guaranteed limit at the extremes; for most of the operating range the error is closer to ±1°C.

Is MCP9904T-1E/9Q RoHS compliant?

Yes, it is listed as ROHS3 compliant, meaning it meets the EU RoHS directive including the exemption updates for lead in solder. Suitable for lead-free assembly processes.

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