RPI-441C1E ROHM Semiconductor Switch (Other) In Stock
ROHM Semiconductor RPI-441C1E is a single-channel through-hole slotted optical switch with transistor output, featuring a 4 mm gap size and 30 V collector-emitter breakdown voltage. It detects position and motion interruptions with a 0.55 mA on-state collector current, suitable for encoder, tachometer, and object detection applications.
- Manufacturer
- ROHM Semiconductor
- Package
- Other
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- RPI-441C1E Datasheet PDF
- Category
- Switch
- Temp Range
- -25.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4 mm optical slot gap for detecting thin interrupter vanes in encoder and position sensing
- 30 V collector-emitter breakdown voltage with 0.55 mA on-state current for direct logic interfacing
- 500 nA maximum dark current for high signal-to-noise ratio in low-light conditions
- Through-hole mounting for robust PCB attachment in vibration-prone industrial applications
Applications
The ROHM RPI-441C1E slotted optical switch is ideal for rotary encoder position sensing, printer paper-jam detection, and tachometer speed measurement applications where a 4 mm slot accommodates thin interrupter disks or blades. Its transistor output with 30 V breakdown voltage enables direct interface with standard CMOS or TTL logic circuits in industrial automation, office automation equipment, and motion control systems.
Specifications
| Factory Lead Time | 12Weeks |
| Coll-Emtr Bkdn Voltage-Min | 30V |
| Configuration | SINGLE |
| Dark Current-Max | 500nA |
| Forward Current-Max | 0.035A |
| Gap Size | 4mm |
| Mounting Feature | THROUGH HOLE MOUNT |
| Number of Functions | 1 |
| On-state Collector Current-Nom | 0.55mA |
| Optoelectronic Device Type | TRANSISTOR OUTPUT SLOTTED SWITCH |
| Output Circuit Type | BJT |
| Slot Width-Nom | 4mm |
| Surface Mount | NO |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the slot gap size of the RPI-441C1E, and what interrupter blade thickness does it accommodate?
The RPI-441C1E has a 4 mm optical gap between its LED emitter and phototransistor detector. This gap accommodates encoder disks, interrupter vanes, or paper-detection tabs up to approximately 3 mm thick with sufficient clearance, making it compatible with standard rotary encoder wheel profiles used in office printers, motor tachometers, and industrial position feedback systems.
How does the RPI-441C1E's transistor output interface with microcontroller or PLC input circuits?
The RPI-441C1E outputs a phototransistor switch with a 30 V collector-emitter breakdown voltage and 0.55 mA nominal on-state collector current. This allows the output to drive a pull-up resistor to 3.3 V or 5 V logic rails directly, providing a TTL- or CMOS-compatible high-to-low transition when an interrupter breaks the optical beam, with no additional driver stage needed for most microcontroller GPIO inputs.
What dark current specification does the RPI-441C1E have, and why does it matter for sensor accuracy?
The RPI-441C1E specifies a maximum dark current of 500 nA when the optical beam is blocked. A low dark current prevents false logic transitions in ambient light or high-temperature conditions, ensuring that the 0.55 mA on-state to near-zero off-state transition is unambiguous. This is particularly important in industrial environments where stray light from LEDs or machinery lighting could otherwise corrupt encoder pulse counts.
In which motion control and automation designs is the RPI-441C1E a reliable alternative to magnetic hall-effect sensors?
The RPI-441C1E is a reliable alternative to magnetic hall-effect sensors in environments where magnetic interference from motors or solenoids would corrupt position data. At 4 mm gap and 30 V CE rating, it suits stepper motor home-position detection, conveyor belt speed sensing, and CNC axis homing routines where optical interruption provides clean, magnetically immune pulses at speeds up to several thousand RPM.
Related Guides
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
0402 10uF X5R Decoupling Design Guide for Compact Digital Rails
Application note for using CL05A106MP5NUNC-class 0402 10uF X5R MLCCs in compact digital rail decoupling designs.
Jun 19, 2026
How to Choose an 0805 10uF MLCC for Decoupling and Bulk Capacitance
Selection guide for choosing 0805 10uF MLCCs around CL21A106KOQNNNE, covering derating, dielectric, package, and sourcing checks.
Jun 19, 2026
Why Buy from FindMyChip
About ROHM Semiconductor
ROHM Semiconductor is a leading electronic component manufacturer. FindMyChip sources ROHM Semiconductor ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”