EE-SX1340

EE-SX1340 is a model in Panasonic’s EE-SX series of optical interrupters (photointerrupters). It’s a compact slot-type sensor that combines an infrared emitter and a phototransistor in one package.
- How it works: An IR beam passes through a small slot. When an object interrupts the beam (or, in some variants, when light is reflected from a target), the phototransistor’s conduction changes, producing a detectable electrical signal (often with a pull-up on an open-collector output).
- Where it’s used: position and speed sensing in printers, encoders, robotics, and other automation equipment.
- Electrical notes: typically four pins (LED anode/cathode and detector collector/emitter). The LED forward current is around 15–20 mA; the detector output usually requires a pull-up and operates from about 3–5 V. CTR (current transfer ratio) and exact pinout vary by package.
- Variants: the EE-SX family also includes reflective and other configurations.
For precise pinout, voltage, current, CTR, and mechanical drawing, consult the EE-SX1340 datasheet. If you want, I can summarize the exact specs from it.

EE-SX1340 is a slot-type optointerrupter (slotted optical switch) from Omron. It comes in a through-hole, 4-pin DIP-style package (not SMD).

EE-SX1340 (Omron) is a slot-type photomicrosensor (photointerrupter) with 4 pins. Typical pin assignment and functions:
- Pin 1: LED anode (IR LED +)
- Pin 2: LED cathode (IR LED −)
- Pin 3: Phototransistor collector (output, requires pull‑up)
- Pin 4: Phototransistor emitter (ground)
Operation: the LED emits IR across the slot; the phototransistor conducts when the beam is received. Interrupting the beam changes the transistor conduction and thus the output voltage.

Manufacturer: Sharp Corporation (Sharp Microelectronics).
What kind of company: A Japanese multinational electronics manufacturer that designs and produces a broad range of products, including consumer electronics, displays, sensors, and optoelectronic components.

EE-SX1340 is a compact reflective infrared optical sensor. Typical applications include object presence/position sensing in printers, copiers, and automation lines; encoder/motion sensing for small motors; edge/limit detection in feeders and conveyors; robotics for obstacle detection and line-following; and noncontact proximity sensing in consumer electronics.

Omron alternatives
• EE-SX1341 (PNP output)
• EE-SX934 (built-in comparator)
• EE-SX1342 (same 3.2 mm slot)
Third-party equivalents
• Sharp GP1A57HRJ00F
• Vishay TCST2103
• Everlight IRM-8601/8602
• TT Electronics OPB880
• Kingbright PT101-3B