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RPI-121 - ROHM Semiconductor

Description: SENSOR OPT SLOT PHOTOTRAN PCB MT,Collector Current[mA]: 0.7,Operating Temperature (Min.)[°C]: -25,3.6x2.6 (t=3.3).

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RPI-121 - ROHM Semiconductor - PCB symbol
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PCB Footprints
RPI-121 - ROHM Semiconductor PCB footprint - Other - Other - RPI-121-3
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3D Models
RPI-121 - ROHM Semiconductor - 3D model - Other - RPI-121-3
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RPI-121 Details

  • Manufacturer Part Number:

    RPI-121

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Obsolete

  • Package Description:

    ULTRA SMALL, ULTRA MINIATURE PACKAGE-4

  • Manufacturer:

    ROHM Semiconductor

  • YTEOL:

    0

  • Coll-Emtr Bkdn Voltage-Min:

    30 V

  • Configuration:

    SINGLE

  • Dark Current-Max:

    500 nA

  • Forward Current-Max:

    0.05 A

  • Gap Size:

    1 mm

  • JESD-609 Code:

    e1

  • Mounting Feature:

    THROUGH HOLE MOUNT

  • Number of Functions:

    1

  • On-State Voltage-Max:

    30 V

  • On-state Collector Current-Nom:

    0.7 mA

  • Operating Temperature-Max:

    85 °C

  • Operating Temperature-Min:

    -25 °C

  • Optoelectronic Device Type:

    TRANSISTOR OUTPUT SLOTTED SWITCH

  • Output Circuit Type:

    Transistor

  • Response Time-Max:

    0.00001 s

  • Slot Width-Nom:

    0.8 mm

  • Surface Mount:

    NO

  • Terminal Finish:

    Tin/Silver/Copper (Sn/Ag/Cu)

RPI-121 Frequently Asked Questions (FAQs)

  • ROHM recommends a 4-layer PCB with a solid ground plane and a separate power plane for the RPI-121. The device should be placed near the antenna, and the antenna should be at least 10mm away from other components. A detailed layout guide is available in the ROHM application note AN11984.
  • The RPI-121 requires a one-time calibration process to ensure accurate temperature measurement. This involves applying a known temperature to the device and then reading the corresponding output voltage. The calibration data should be stored in an external EEPROM or microcontroller for future use. ROHM provides a calibration guide in the RPI-121 datasheet.
  • The RPI-121 is rated for operation from -40°C to 125°C, but the accuracy of the temperature measurement may degrade above 100°C. For applications requiring high-temperature operation, ROHM recommends using the RPI-122, which is rated for operation up to 150°C.
  • Yes, the RPI-121 is suitable for battery-powered devices due to its low power consumption (typically 10μA). However, the device requires a stable power supply voltage between 2.7V and 5.5V to ensure accurate temperature measurement. A low-dropout regulator (LDO) or a battery voltage supervisor may be necessary to ensure the power supply voltage remains within the recommended range.
  • The RPI-121 has an analog output voltage that is proportional to the measured temperature. This output can be connected to an analog-to-digital converter (ADC) in a microcontroller. ROHM recommends using a 10-bit or 12-bit ADC to ensure accurate temperature measurement. The microcontroller can then use the ADC reading to calculate the temperature using the formula provided in the RPI-121 datasheet.

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