Miniature LDR
Product Code : LSK-PL-10304
Miniature LDR (SKU LSK-PL-10304) is a 5 mm light dependent resistor, or photoresistor, housed in an epoxy package. Its semiconductor element conducts better as light increases, so its resistance falls in bright light and rises in the dark. Students use it in light-sensing circuits and component investigations in senior school, ITI and college electronics. Science Lab Supplies supplies the component from Ambala, India to schools, colleges, training institutes, tender contractors and distributors.
Specifications
The LDR is a 5 mm epoxy-packaged device with leads at a 3 mm pitch. In darkness its resistance is 1 MΩ, falling to 10–20 kΩ at 10 lux and 2–4 kΩ at 100 lux. Its peak spectral response is at 540 nm, and it is rated for up to 150 V peak and 100 mW.
| Parameter | Value |
|---|---|
| SKU | LSK-PL-10304 |
| Package | Epoxy, 5 mm diameter |
| Lead pitch | 3 mm |
| Maximum voltage | 150 V peak, AC or DC |
| Power dissipation | 100 mW |
| Dark resistance | 1 MΩ |
| Resistance at 10 lux | 10–20 kΩ |
| Resistance at 100 lux | 2–4 kΩ |
| Peak spectral response | 540 nm |
| Operating temperature | −30 °C to +70 °C |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Miniature LDR
Because its resistance changes strongly with light level, the LDR is the usual first sensor in electronics teaching. Students measure its resistance under different lighting, plot the response, and then build circuits that switch a lamp, buzzer or LED when light falls or rises, such as a model automatic street light.
- Class 12 physics investigatory projects: resistance of an LDR against light intensity.
- B.Sc. electronics practicals: characteristics of a light dependent resistor.
- ITI electronics trades: light-sensor and switching circuits.
- School STEM clubs: dark-activated and light-activated alarm models.
Keep circuits within the 150 V and 100 mW ratings; school work normally uses low-voltage cells or supplies.
Standard Scope of Supply
The Miniature LDR is supplied as the bare epoxy-packaged component with two leads, as described above. Breadboards, resistors, leads and a meter are separate items, and quantities for a class can be packed together on request.
Packing, MOQ and Lead Time
The quotation can be for a few pieces, a class quantity or a larger number for several labs. It will show packing, delivery time and price for the number you request, with room to add meters, leads or other school physics lab equipment in India.
Science Lab Supplies is a registered exporter with an Importer-Exporter Code and can ship to buyers in Oman, the Philippines, Nepal, Bangladesh, Zambia and Rwanda. Science Lab Supplies is registered for GST (GSTIN 06ADEPJ0574F2ZU). Ask for a price through the contact page or the enquiry cart; the lab tender page explains tender quotes.
Frequently Asked Questions
How does a light dependent resistor work?
It is made of a semiconductor whose conductance changes with light. As more light falls on it, its resistance drops: from 1 MΩ in the dark to 2–4 kΩ at 100 lux for this part.
What size is the Miniature LDR?
The epoxy package is 5 mm in diameter and the leads are spaced at a 3 mm pitch; check that spacing against the board you plan to use.
Who supplies the Miniature LDR?
Science Lab Supplies supplies it from Ambala, India, and can pack LDRs in class quantities alongside other physics lab equipment in the same order.
What colour of light is it most sensitive to?
Its peak spectral response is at 540 nm, in the green part of the visible spectrum.
Related Measurement and Circuit Items
An LDR experiment needs a way to measure resistance, a controlled light source and connections. These four items cover each need: a multimeter and resistance box for measurements, a ray box for directing light, and leads with alligator clips for quick connections.
- Digital Multimeter — reads the LDR's resistance.
- Resistance Box — known resistances for comparison.
- Raybox with Accessories — a light source for the sensor.
- Connecting Leads with Alligator Clips — quick circuit connections.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 25 September 2026
