OPL535 – TT Electronics / Optek Photologic® Sensor
Complete Datasheet Summary (Issue C09/2016)

1. Device IdentityBase Part Number: OPL535Package: Molded plastic side-looking with recessed integral lensRoHS Status: CompliantSpectral Match: Designed for OP140 / OP240 family IR LEDs (λ = 935 nm typical)
2. Functional Description

• Monolithic silicon IC integrating photodiode, trans-impedance amplifier, voltage regulator, Schmitt trigger and NPN open-collector output transistor.
• Recessed lens provides wide acceptance angle and good mechanical protection.
• High noise immunity thanks to on-chip Schmitt hysteresis.
• Internal 10 kΩ pull-up resistor (chip-to-VCC) gives “active-high” logic output.

1. Key Features

• Supply range 4.5 V – 16 V (OPL535-OC 4.5 V – 18 V)
• Low supply current 2.7 mA typ, 5 mA max @ 5 V
• TTL / LSTTL / CMOS compatible output (open-collector)
• 200 kBaud max data rate (OPL560-series limited)
• Propagation delay 1 µs typ, 5 µs max (light-to-high)
• Wide irradiance window 0.08 – 0.40 mW cm⁻² (standard grade)
• Operating temperature –40 °C to +85 °C
• Storage –40 °C to +100 °C

1. Absolute Maximum Ratings (TA = 25 °C unless noted)VCC ........................................ 18 VOutput voltage (open-collector) .......... 35 VOutput current (sink) .................... 50 mAPower dissipation ........................ 90 mW (derate 2.67 mW/°C above 70 °C)Lead soldering (1.6 mm from case) ........ 260 °C, 5 s max (RMA flux recommended)ESD HBM .................................. 2 kV (typical class)
2. Electrical Characteristics (VCC = 5 V, TA = 25 °C, λ = 935 nm)
3. Supply
   VCC operating ............................ 4.5 V – 16 V
   ICC (no light) ........................... 2.7 mA typ, 5 mA max
4. Optical Thresholds (irradiance Ee on sensor surface)
   EeT(+) positive-going (output released) .. 0.08 mW cm⁻² min, 0.40 mW cm⁻² max
   EeT(–) negative-going (output asserted) .. 0.06 mW cm⁻² typ (hysteresis ≈ 1.2 ×)
   Hysteresis ratio EeT(+)/EeT(–) ........... 1.05 – 1.5 (guaranteed)
5. Output (open-collector with internal 10 kΩ pull-up)
   VOL (IOL = 12.8 mA, Ee = 0) .............. 0.25 V max
   IOH leakage (VO = 30 V, Ee = 0) .......... 0.1 µA typ, 10 µA max
   tr / tf (RL = 300 Ω to 5 V, CL = 50 pF) ... 50 ns typ, 70 ns max
   Propagation delay tpLH ................... 1 µs typ, 5 µs max
   Propagation delay tpHL ................... 3 µs typ, 5 µs max
6. Typical Performance Curves (refer to datasheet)

• Output voltage vs irradiance – monotonic with 20 % hysteresis band
• Supply current vs VCC – flat 2.7 mA from 5 V to 16 V
• Frequency response – usable to 250 kBaud (limited by tr/tf)
• Temperature coefficient of threshold – < –1.6 %/°C below 0 °C

1. Pin Configuration & Mechanical3-pin side-looking package:Pin 1 Ground (GND)Pin 2 Output (open-collector)Pin 3 VCC
2. Overall size: 4.45 mm L × 3.81 mm W × 5.72 mm H (including lens)
   Lead spacing: 2.54 mm (0.100 in) standard pitch
   Weight: ≈ 0.3 g
3. Recommended Interface CircuitVCC (4.5 – 16 V)│└─► Pin 3 VCC│▼ 10 kΩ (internal)├── Output (Pin 2) ──► MCU / TTL input (add 4.7 kΩ external if lower pull-up desired)│GND (Pin 1) ──► System GND
4. Optional: 100 nF ceramic from VCC to GND within 10 mm of sensor for noisy environments.
5. Typical Applications

• Non-contact reflective object sensing (slot, door, lid)
• Assembly-line automation – part-present / counting
• End-of-travel / limit sensing in printers, copiers, vending machines
• Machine-safety interlocks
• Line-following robots when paired with OP140 IR LED

1. Optical Assembly Notes

• Keep lens clean; recessed design reduces dust accumulation but does not eliminate it.
• Maximum continuous irradiance 10 mW cm⁻² (avoid direct sunlight with focusing optics).
• For reliable switching maintain Ee on surface ≥ 1.5 × EeT(+)max in the “ON” state and ≤ 0.7 × EeT(–)min in the “OFF” state.
• Match LED drive current to achieve 0.3 – 0.5 mW cm⁻² at working distance for 25 % margin.

1. Packing & Ordering InformationOrderable Part: OPL535 (standard grade)Suffix options:–OC open-collector without internal pull-up (add external resistor)–A / –B tighter irradiance bins available on requestReel: Antistatic 12 mm embossed tape, 1 k pcs/reel typicalMSL: 1 (unlimited floor life)Factory: TT Electronics – Carrollton, TX
2. Related Documents

• OPL530-563 Datasheet Issue C09/2016 (10 pages)
• Application Note “Designing Reflex Sensors with Photologic Devices”
• OP140 / OP240 LED datasheets for emitter pairing
• All data subject to TT Electronics standard disclaimer – verify latest revision before production use.