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. It suits light-sensing circuits and component investigations in senior school, ITI and college electronics. Science Lab Supplies in Ambala, India, offers it in single pieces or class quantities to schools, colleges, training institutes and distributors.
Specifications
Ratings, light response and size of the LDR are given one per row. In short, the 5 mm epoxy device has leads at a 3 mm pitch, reads 1 MΩ in darkness, falls to 10–20 kΩ at 10 lux and 2–4 kΩ at 100 lux, peaks at 540 nm and is rated 150 V peak and 100 mW.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10304 |
| Type | Light dependent resistor (photoresistor) |
| Element | Semiconductor; conductance changes with luminance |
| Package | Epoxy |
| Diameter | 5 mm |
| 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 makes a clear first sensor for electronics teaching. Students can 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 against light intensity, read on a Digital Multimeter.
- B.Sc. electronics practicals: characteristics of a light dependent resistor.
- ITI electronics trades: light-sensor and switching circuits.
- Lighting the sensor from a Raybox with Accessories at different distances.
Keep circuits within the 150 V peak and 100 mW ratings of the component.
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 that can be listed on the quotation, 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). State the number of LDRs on the contact page, combine them with meters and leads in the enquiry cart, or quote them in a tender through the lab tender page.
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?
LDRs in class quantities are packed and quoted by Science Lab Supplies in Ambala, India, alongside meters, leads and other physics lab equipment on 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, so it responds most strongly to light near that wavelength.
Related Measurement and Circuit Items
An LDR experiment needs a way to measure resistance, reference resistors and connections. These items cover each need: a resistance box, substitution box, resistor set and ohmmeter for comparisons, a resistance apparatus for wire studies, lamps for a light source and leads for quick connections.
- Resistance Box — resistance dialled in decades, with 4 mm spin-free terminals and an earth terminal.
- Resistance Substitution Box — 12 switched resistors at 5% tolerance with two 4 mm yellow terminals.
- Resistor Element Set with Holders/Clamps — 1 Ω to 1 kΩ metal film resistors with clamp-type holders.
- Ohmmeter Series Type 0-100 ohms — battery-cell ohmmeter in an unbreakable case with a clear front cover.
- Resistance Dependence Apparatus — constantan and brass wires 1 m long with 4 mm sockets.
- Miniature Lamps on Clamp Stands — 13.5 V, 6.3 V and 3.5 V miniature lamps on clamp stands.
- Connecting Leads with Alligator Clips — ten 24 in, 22 AWG leads in red and black.
Browse the full Physics Lab range, the Electrical and Electronics range, or all physics lab equipment.
Last updated: 22 October 2026
