The TC646B also features Microchip Technology's proprietary FanSenseâ„¢ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, pin 5. A missing-pulse detector monitors this pin during fan operation. A stalled, open, or unconnected fan causes the TC646B device to turn the VOUT output on full (100% duty cycle). If the fan fault persists (a fan current pulse is not detected within a 32/F period), the FAULT output goes low. Even with the FAULT output low, the VOUT output is on full during the fan fault condition in order to try and restart the fan. The FAULT signal is also asserted if the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible thermal runaway condition exists.
Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life |
FanSenseâ„¢ Protects Against Fan Failure |
Efficient PWM Drive |
Automatic Shutdown Mode for "Green" Systems |
3.0V to 5.5V Supply Range |
Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage |
Supports Low Cost NTC/PTC Thermistors |
Fan Auto-Restart |
Over-Temperature Indication |
Device Description | Fan Manager |
---|---|
Typical Accuracy (°C) | Depends on external thermistor |
Over Temp Alert | True |
SM Bus | False |
Predictive Fan Fault | False |
Max. Supply Current (µA) | 400 |
Max Accuracy @ 25°C (°C) | Depends on external thermistor |
Integrated temp Sensor | False |
Fan Sense | True |
External Temp Input | True |
Auto Shutdown | True |
PWMFreq | Low |
FanSpeedTable | No |
Temp. Range Max. (°C) | +85 |
Temp. Range. Min. (°C) | -40 |
Vcc Range Max. (V) | +5.5 |
Vcc Range Min. (V) | +3.0 |
Pins | Packaging | 8 | SOIC |
Temp Range | -40C to +85C |
Packing Media | Tube (100) |
Data Sheets |
---|
TC646B/TC648B/TC649B Datasheet |
JEDEC Indicator | e3 |
---|---|
ROHS | Compliant |
China EFUP | Compliant |
Device Weight (g) | 0.078 |
Shipping Weight (kg) | 0.25 |
Lead Count | 8 |
Package Type | SOIC |
Package Width or Size | .150In(3.90mm) |
Soldering Composition | Matte Tin |
PWM Fan speed Controller | Microchip Technology |
Pwm, Fan Speed Cntrl, Sd, 8-Soic | Newark Electronics |
PWM, FAN SPEED CNTRL, SD, 8-SOIC | Farnell |
TC646 Series 5.5 V PWM Fan Speed Controller w/ Fault Detection - SOIC-8 | Future Electronics |
PWM Fan Motor Speed Controller 8-Pin SOIC N Tube | Avnet America |
Microchip TC646BEOA, PWM Controller 34 Hz, 3 - 5.5 V, 8-Pin SOIC | Microchip Technology Inc. TC646BEOA | RS Americas |
Where can I find additional details, specifications and documents for a TC646BEOA?
Additional datasheets, footprints and schematics for TC646BEOA are listed on our Part Details page. You can also find images and similar parts to TC646BEOA on this page.
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What category does TC646BEOA fall under?
The TC646BEOA is listed under Semiconductors - ICs > Power Management ICs - PMIC > Drivers & Controllers > Motor Drivers / Controllers.
Can I view similar or alternative parts?
You can view similar parts to TC646BEOA when available in the Motor Drivers / Controllers range under the specifications section at the bottom of the details page.
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Is the TC646BEOA RoHS compliant?
Yes. This part has been flagged as RoHS Compliant by Microchip Technology.
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Authorised distributors including Microchip Technology, Newark Electronics, Farnell, Future Electronics and Avnet America have stock available or on a lead time for TC646BEOA.
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