SMD 3528 LED Strips, IR Lighting and Components

SMD 3528 lighting: choose the actual strip, chip or sensor

This collection primarily contains flexible LED strips marketed as SMD 3528, plus small packs of loose LED chips, infrared strips and one 3528-sized light-dependent resistor (LDR). “3528” can identify an LED's approximate 3.5 × 2.8 mm outline; it does not specify supply voltage, LEDs per metre, strip length, protection rating, color, electrical drive or even whether the selected item emits light. Several strip descriptions also carry conflicting 2835/5050 chip-model fields. Choose by the selected variant and check the corresponding product details rather than transferring a specification from a headline to a different option.

Four distinct product forms

• Finished flexible LED tape: 5 V USB-powered or direct-current 12 V and 24 V strip assemblies are listed with different lengths, densities and colors. These have PCB traces and current-limiting arrangements designed for the stated strip supply. They are not bare 3 V LEDs.
• Infrared or near-UV tape: IR strip listings distinguish 850 and 940 nm as well as 3528 and 5050 package selections; a purple/UV-labeled tape separately lists 12 or 24 V and 60, 120 or 240 LEDs/m. Optical purpose and eye safety differ from visible decorative lighting.
• Loose SMD LED chips: listings include a selectable 3528(1210) 100-piece single-color option and a 2,000-piece product with separate color options. Other sizes in those product menus are distinct choices, not bundled 3528 LEDs. Bare chips need a suitable PCB footprint and controlled current.
• Non-LED sensing part: a 50-piece 3528-size light-dependent resistor/photoresistor listing is a sensor whose resistance responds to light; it is not a diode, emitter or strip. It remains here as listed, but should be selected only for an appropriate sensing circuit.

Package names versus electrical assemblies

A 3528 footprint is a physical LED-package family, roughly 3.5 × 2.8 mm, commonly cross-described as 1210 in these listings. Actual body height, pad layout, polarity marker, lens and thermal properties vary; use the exact component drawing for PCB design. “SMD 3528” on a strip describes the marketed lamp bead, not an independent supply rating for each bulb. For loose LED chips, check forward voltage, operating current, maximum ratings, optical bin and reflow limits for the selected color. Provide appropriate current limiting or an LED driver. Never directly connect a loose chip across a 5, 12 or 24 V source on the assumption that a completed strip with the same numeral can run at that voltage.

A strip assembly is not simply a chain of identical 3528 chips. Circuit sections, series grouping, resistor values, copper width and input voltage determine where it can be cut and how it should be supplied. The 5 V USB tape, 12 V orange tape and 24 V 240-LED/m UV-labeled option have different electrical requirements even when all appear on this page. Match the chosen input voltage exactly, check polarity, and size a suitable low-voltage supply for the specified watts per metre times the actual length, allowing practical headroom. Do not use a USB connector as proof that a multi-metre run can draw unlimited current from any USB port. Confirm cable rating, connector and source capacity; long or dense strips can show voltage drop and uneven brightness when fed at one end.

Choose supply voltage and length together

The USB strip products list 5 V DC and selectable lengths including 1, 2, 3, 4 and 5 m; another 5 V strip offers 0.5 through 5 m, with its protection choice shown separately. The USB-connector listing has color and length choices and a connector option, but an external USB power supply is not automatically included just because the strip is USB-powered. For these products the selected length changes total load and can affect allowable supply arrangements. Confirm any included USB lead and switch in that particular listing rather than assuming a controller, adapter or battery ships with the tape.

Several 12 V listings offer 5 m rolls described as 300 LEDs at 60 LEDs/m, with red, green, blue, warm white or white options and sometimes RGB or “changeable” choices. Another 12 V line offers 120 LEDs/m, 5 m and color options from warm to cool white and primary colors. Density does not by itself determine brightness or power because emitter type and drive vary. Orange vehicle-chassis-oriented listings offer 3528 60 or 120 LEDs/m as well as a selectable 5050 60 LEDs/m; PCB color and protection are independent options. A selected 5050 strip is not a 3528 strip, and a five-metre roll at 120 LEDs/m is not the same 300-emitter roll as five metres at 60 LEDs/m.

The mixed 2835 listing provides separate 5, 12 and 24 V variants and 5 m choices marked 300, 600 or 1,200 LEDs. Those labels correspond respectively to 60, 120 or 240 LEDs/m for a five-metre selection, but its headline also mentions 2,400 “pixels”; do not infer 2,400 individually addressable LEDs or any data protocol from that marketing language. The selectable options describe color, voltage and LED count; verify chip family and electrical arrangement from that actual item. Other generic “replace SMD 3528/5050/5630/5730” copy describes comparison/use context rather than a guarantee that one selected strip includes all chip packages.

Color, white tone and RGB control

Visible options include red, green, blue, yellow, orange, purple, pink, ice blue and warm, natural, pure or cold white in different listings. White color-temperature ranges quoted on individual product pages are not shared by all white variants; confirm the selected strip's CCT, viewing context and any diffuser used. RGB and “changeable” options may require a compatible external controller and matching conductor count, while fixed single-color strips require their rated supply and switching. A seller says to purchase its RGB connector/controller and adapter separately; therefore an RGB strip should not be presented as an automatically complete color-changing system. Standard analog RGB strips are not automatically digitally addressable pixels, and a fixed-color 3528 emitter is not a multichannel controller.

Color and optical output vary with supply voltage, temperature, lens, mounting surface and reflected light. A listing's lumens or generic “high brightness” phrase may be recorded for another color or length and should not be used as a guaranteed output for every choice. Check watts per metre, LED density, CCT or wavelength and viewing distance together, especially when comparing ambient accent lighting with task illumination. Black or white PCB color changes the visible backing of the tape, not the wavelength of orange LEDs in the selectable orange-light product.

Waterproof wording and installation boundaries

Protection selections include IP21/non-waterproof, IP65/silicone-coated and some “IP30 Waterproof” wording. IP21 or IP30 should not be interpreted as waterproof despite an inconsistent variant label; check the actual product's construction and an evidenced IP rating. An IP65 claim on a coated tape relates to a particular configuration and test condition, not automatically to cut ends, splices, power adapters or connectors after installation. No listed strip should be assumed suitable for submersion. Plan appropriate enclosure and strain relief in damp locations, and protect exposed cut pads and connections. Installation on a heat-conductive surface and ventilation can influence strip temperature and longevity.

Choose the intended cut points printed on the actual strip and observe polarity when joining sections; cut pitch depends on the circuit and voltage. The adhesive backing, if included, needs a clean compatible mounting surface, but does not establish mechanical retention or environmental sealing for all conditions. Excessive tight bends can damage the flexible PCB and components. Confirm the selected length, width, density and connector arrangement before planning a channel or diffuser. A 5 m strip cannot be assumed to use the same feed-wire gauge or power-injection approach as a 0.25 m piece.

IR and UV selections need wavelength-specific thinking

Infrared strip listings let you choose 850 or 940 nm and separately 3528 or 5050 SMD, with lengths around 0.5 to 5 m; one explicitly labels the selected length DC 12 V. An 850 nm emitter may show a faint visible red glow, whereas 940 nm is typically less visibly apparent, but camera sensitivity, filters and illumination distance are system-dependent. Neither option guarantees night-vision performance or compatibility with a particular surveillance camera. “Physiotherapy” in seller wording is not evidence of a medical treatment effect or approval. Invisible IR can still create eye-exposure risk; evaluate optical power and use suitable precautions.

The UV/purple-labeled strip's selectable options include 12 V 60/120 LEDs/m and 24 V 240 LEDs/m, with separate coated and non-coated choices and lengths from about 0.5 to 5 m. No verified wavelength, irradiance or germicidal rating applies across those options. Do not promise fluorescent effect on every material or a curing result. Protect eyes and skin when testing UV or near-UV lighting, and verify the actual spectral specification and exposure controls for the chosen product. The 12 V and 24 V versions cannot be interchanged merely because they use the same 3528 name.

Loose chips, reels and the photoresistor

The 100-piece multi-size LED listing has independent size options including 3528(1210), 0402, 0603, 0805, 1206, 5050 and 5730, plus individual color choices. Selecting “3528(1210) / Blue 100pcs,” for example, means the 3528-family blue 100-piece selection, not a mixed package of every size and color. The 2,000-piece SMD 3528/6028 listing offers individual white, warm white, orange, yellow, blue, green, pink, red, gold yellow or ice-blue selections. Although its headline mentions RGB, the observed color menu does not present a clearly identified RGB common-anode variant: do not treat a selected white or blue 2,000-piece pack as a tricolor device without product-specific evidence. Check polarity, pad dimensions, tape/reel format and the actual pieces-per-pack before production assembly.

The light-dependent resistor listed as “50pcs/lot LDR smd 3528 photoresistor” is not an LED; its 3528-sized body designation alone does not supply a resistance-versus-illuminance curve, dark resistance, response speed or spectral sensitivity. For sensing, obtain the selected LDR's electrical data and calibrate the measurement circuit. An LDR must not be substituted for a 3528 emitter or wired like an LED. This category retains the listing but makes the difference explicit to prevent ordering the wrong device.

Pre-order checklist

1. Identify the selected form: 3528 LED strip, 2835/5050 alternative, loose LED chips, IR/UV tape or non-emitting LDR.
2. For strips, match the exact 5, 12 or 24 V DC input, length, LEDs per metre, color and supply capacity. Do not apply a strip's rated voltage to a bare chip.
3. Compare fixed single color with RGB or “changeable”; check whether a controller, power adapter, USB lead or connector is actually included.
4. Match 3528 versus 5050 or 2835 selection, 60 versus 120 versus 240 LEDs/m, white versus black PCB and coated versus uncoated protection.
5. For IR, select 850 or 940 nm deliberately. For UV-labeled items confirm wavelength and safe operating precautions instead of assuming certified performance.
6. For loose parts check quantity, selected color, footprint, polarity, forward-voltage/current limits and packing format; for the LDR check sensing specifications, not LED specifications.

The chosen variant and its supporting product detail govern the delivered configuration. Conflicting generic chip-model fields, lifetime numbers and certification strings in seller listings cannot establish one collection-wide technical rating or certification.