5mm Flat Top Wide Angle Blue LED - Wide Angle

The 5mm flat top blue led is one of the most popular wide angle leds available.

In stock

SKU
5MMFLATTOPLEDBLUE
Color
Blue
Size
5mm Flat Top
$0.21
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Description / 5mm Flat Top Wide Angle Blue LED - Wide Angle

The 5mm Blue LED (Flat Top) delivers a wide viewing angle for even illumination from off-axis positions — the right choice when you need instrument panel backlighting, guitar pedal indicators, and arcade button illumination.

The flat lens surface spreads light at a wide 105-115 Degrees viewing angle — 4 to 5 times wider than a standard round-top LED. Bright and visible from off-axis angles while still maintaining clear color definition through the transparent lens.

Size5mm (T-1 3/4)
TypeFlat Top
Forward Voltage3.0-3.4v
Brightness10,000-12,000mcd
Viewing Angle105-115 Degrees
LensClear
PackageT-1 3/4 through-hole DIP
Drive Current20mA typical

Why flat top instead of round top?

A standard round-top 5mm LED has a 15–30 degree beam — bright when viewed straight on, but nearly invisible from the side. The flat top (sometimes called a flat head LED or square LED due to its flat lens face) spreads that light wide, making the LED clearly visible whether you are looking down from a standing position, viewing a panel from across a room, or backlighting a translucent surface that needs even coverage with no hotspots.

Common applications

  • Automotive gauge cluster backlighting: modern cluster accent, CB radio meter backlight upgrade. The wide beam eliminates the bright-center/dark-edges problem that round-top LEDs cause behind gauge faces. Drop-in for GM Silverado/Sierra, Honda Civic, Jeep Wrangler TJ, Ford Mustang, and Toyota/Lexus clusters.
  • Guitar pedal status indicators: Blue is a popular modern alternative to red for custom and boutique pedal builds. The flat top is the standard choice on DIYStompboxes, r/diypedals, and The Gear Page. Visible from a standing position looking down at your pedalboard — a narrow round-top would appear dim from that angle.
  • Arcade pushbutton illumination: Lights up the entire translucent button cap (Sanwa, Seimitsu, Happ/IL) with even color instead of a single bright dot. Also used for marquee backlighting in BYOAC cabinet builds.
  • Model railroad building interiors: cool-toned accent for commercial model structures. The wide angle fills HO and N scale structure interiors with realistic lighting instead of a spotlight effect.
  • Panel indicators and control boxes: Fits standard 5mm LED holders and panel bezels. The wide angle means the indicator is readable from anywhere in front of the panel, not just dead center.
  • Breadboard prototyping: The flat top sits stable in a breadboard hole without rocking, and the wide beam is visible from normal desk-level viewing angles.

5mm is the standard size for most flat top applications — direct replacement for T10 wedge bulbs in automotive clusters, standard fit for arcade pushbuttons, and visible at distance for panel indicators.

Standard T-1 3/4 through-hole footprint. Fits all 5mm LED holders, bezels, and panel-mount clips.

Resistor quick reference (20mA):
SupplyResistorRating
5V100Ω1/4W
9V300Ω1/4W
12V470Ω1/4W
15V*620Ω1/2W
18V750Ω1/2W

*Use 15V instead of 12V for vehicle/alternator sources to account for charging voltage (13.8–14.4V).

Full LED Resistor Calculator → for other voltages, series strings, and parallel configurations. Or skip the math with our 20mA Current Limiter (2–45V DC).

Frequently Asked Questions

The flat top is visible from a standing position looking down at a pedalboard — a narrow round top LED would appear dim from that steep angle. The flat lens also sits flush in a panel bezel mount for a clean, professional look. Diffused flat tops are especially popular for a soft glow without a blinding hotspot on a dark stage.
Both have flat lens surfaces, but the concave variant has a dished-inward lens that increases the viewing angle to 150-180 degrees (vs 105-115 for standard flat top). Choose concave when you need maximum coverage — gauge cluster backlighting, large-area illumination. Choose standard flat top for most other applications.
Yes. Some people search for square LEDs when they mean flat top — the flat lens face gives a squared-off appearance compared to the domed round top. Flat top, flat head, and square LED all refer to the same product category.

DC power recommended: LEDs are designed for DC. Running on AC will cause flickering and reduce lifespan. If you're using a low-voltage AC source — such as a model railroad transformer output or DCC track voltage — convert it to DC first with a bridge rectifier.

Sold individually (1 LED per quantity ordered).

PCB Design: KiCad footprint: LED_THT:LED_D5.0mm (built-in with KiCad). EasyEDA: search “LED_D5.0mm” in the built-in library. Download KiCad files ↓

Specifications are sourced from manufacturer data and may be updated without notice. While we work to keep product information accurate, always verify critical parameters against the manufacturer's datasheet for production designs. Found an error or discrepancy? Let us know — we genuinely appreciate the correction.

More Information

Size 5mm Flat Top
Color Blue
Luminosity/Brightness 10,000-12,000 mcd
Forward Voltage 3.0-3.4v
Current 20mA
Wavelength 460-465nm
Viewing Angle 105-115 Degrees
Mount Style Through Hole (DIP)
Lens Color Clear
LED Brightness Class Super/Ultra/Extreme
Documentation Link Documentation: 5mm Flat Top Wide Angle Blue LED - Wide Angle - Datasheet / Specifications

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