3mm Round-Head Single-Color LED
3mm Round-Head Single-Color LED - Hongcheng Optoelectronics LED Manufacturer
Product Overview:
The 3MM round-top LED, also called an F3 through-hole light-emitting diode, uses a round lens encapsulant approximately 3mm in diameter. It features a compact size, high brightness, focused light output, fast response and easy installation.
Key Advantages:
- 3MM standard round-head package for broad compatibility
- Top lens emission with high brightness and good visibility
- Two-lead through-hole structure for convenient soldering and mounting
- Available in red, yellow, green, blue, white, orange and purple
- Clear, diffused and tinted encapsulants available
- Custom brightness, wavelength, viewing angle and lead length available
Applications:
- Indicators for instruments, meters and industrial equipment
- Appliance panels, button and switch indicators
- Audio equipment, power amplifiers and communications equipment
- Power supplies, chargers and security products
- Traffic signals and electronic signage
Product Features:
Chips: A-grade chips from leading brands in Taiwan and mainland China provide stable brightness and good color consistency; brightness and wavelength binning are available.
Gold wire: 99.99% pure gold wire bonding provides good electrical conductivity and strong, reliable bonds.
Encapsulant: high-quality epoxy resin provides good light transmission, strong heat resistance and resistance to yellowing during long-term use.
Lead frame: High-quality metal lead frame with good conductivity; custom lead lengths, forming and polarity configurations available.
Packaging: Bulk, bagged and customer-specified packaging available, with antistatic and moisture protection.
Category: Through-Hole LED Series
Quick Reference: Key Optoelectronic Parameters (by Emission Color)
Test conditions: forward current IF=20mA, ambient temperature 25℃. Data are taken from each model's datasheet. “—” indicates that the item is not specified; download the corresponding PDF for complete specifications.
| Emission Color | Part Number | Forward Voltage VF (V) | Wavelength λp / Color Temperature CCT | Luminous Intensity Iv (mcd) | Viewing Angle 2θ½ (°) | Test Current IF (mA) | Operating Temperature |
|---|---|---|---|---|---|---|---|
| Red | HC-34LU21R3JT-AA-L-2 | 1.8~2.4 | 620~630 nm | 1000~3000 | 30 | 20 | -20 ~ +80℃ |
| Pure Green | HC-34LU30G5MD-AA-L-1 | 2.6~3.2 | 515~520 nm | 2000~4000 | — | 20 | -20 ~ +80℃ |
| Blue | HC-34MU02B36BMW-AB-L-1 | 2.8~3.4 | 460~465 nm | 300~600 | — | 20 | -20 ~ +80℃ |
| Orange | HC-34MU21O26BJW-AA-L | 1.8~2.4 | 600~610 nm | 300~500 | — | 20 | -20 ~ +80℃ |
| Yellow | HC-34MU30Y43AJD-AB-O-1 | 1.8~2.4 | 585~595 nm | 10~30 | — | 20 | -20 ~ +80℃ |
| White | HC-34LU02W9CMC-AA-L-1 | 2.6~3.2 | 8000~12000 K | 5000~10000 | 45 | 20 | -20 ~ +80℃ |
Related Products
3mm Round-top Single-color LEDs A 3mm (Φ3) round-top through-hole indicator LED with a standard drive current of 20mA. Compact and low-power, it is available in red/yellow/green/blue/white for power indication, status displays and toy electronics in confined spaces. Factory-direct from Dongguan Hongcheng Optoelectronics Co., Ltd. (an international member of Guangyu Group with over 20 years of LED packaging experience), it uses Grade A chips and 99.99% pure gold wire bonding and is RoHS certified. Free samples and custom specifications are available. Download the datasheet PDF on this page for complete electrical parameters (voltage, brightness, wavelength, current, dimensional drawings, pad layout and tape packaging).
Q: Can the lead length of through-hole LEDs be customized?
A: Standard lead length is 23-25mm. Custom lead trimming (minimum 3.5mm) and lead forming are available; tape packaging supports automatic insertion machines.
Product Specifications at a Glance
| Product Name | 3mm Round-top Single-color LEDs |
|---|---|
| Package: | Through-hole package, round top |
| Dimensions | Φ3mm |
| Mounting: | DIP Through-hole |
| Emission Color | Single-color options available |
| Environmental Certification | RoHS |
| Manufacturer | Dongguan Hongcheng Optoelectronics Co., Ltd. |
| Customization: | Custom emission color, brightness, wavelength, encapsulant and lead length available |
| Detailed Specifications | See the datasheet PDF on this page for complete electrical parameters |
| Minimum Order Quantity (MOQ) | 1K（1,000 pcs） |
| Sample Lead Time | Typically 3-4 working days |
| Volume Production Lead Time | Typically 10-15 working days |
💡 Typical Applications: Common applications include indicators for instruments and industrial equipment, home appliance panels, button and switch indicators, audio equipment, power amplifiers and communications equipment, power supplies, chargers and security products.
Key Electrical Specifications (Text Version)
The table below lists the core electrical specifications of Hongcheng Optoelectronics 3mm round-top single-color LEDs (F3 round-top through-hole (T-1)), as plain text for easy searching and copying:
| Specifications | Value |
|---|---|
| Diameter | Φ3.0mm |
| Power | 0.03~0.06W |
| Forward Voltage | 1.8~3.4V (depending on color) |
| Forward Current | 15~25mA |
| Luminous Intensity | 100~10000mcd (binned by viewing angle) |
| Viewing Angle | 15°~60° |
| Typical Applications | Indicators, toys and small household appliances |
Forward Voltage and Wavelength Quick Reference by Color
Voltage varies significantly between colors in the same package. Select current-limiting resistors using the values for the specific color:
| Emission Color | Wavelength Range | Forward Voltage | Chip Material |
|---|---|---|---|
| Red | 620~625nm | 1.8~2.4V | AlGaInP |
| Yellow | 585~595nm | 1.8~2.4V | AlGaInP |
| Orange | 600~610nm | 1.8~2.4V | AlGaInP |
| Standard Green | 565~575nm | 1.8~2.4V | AlGaInP |
| Emerald Green | 520~530nm | 2.8~3.4V | InGaN |
| Blue | 450~470nm | 2.8~3.4V | InGaN |
| White (Neutral White) | Full Spectrum | 3.0~3.4V | InGaN + phosphor |
Selection and Application Guidance
The 3mm round-top (F3/T-1) LED is a standard indicator for small devices: it is the small light commonly found in toys, small appliances, remote controls and charging docks. Its Φ3mm size requires only small PCB holes and enclosure light openings, and facilitates manual insertion and wave soldering. Toy products require particular attention to encapsulant flame retardancy and small-parts safety standards (EN 71 / GB 19865). Mid-range and higher Hongcheng Optoelectronics F3 series products use flame-retardant epoxy resin and include RoHS test reports, allowing toy export customers to pass inspection directly.
Q: How should I choose between 3mm and 5mm round-top LEDs?
A: Both are 20mA-class through-hole indicator LEDs. Choose 3mm (Φ3) for compact spaces and small panel openings, or 5mm (Φ5) when higher brightness bins or a more traditional indicator appearance are needed. Electrical specifications are the same for the same color; the main differences are package size and luminous-intensity bins.
Ordering and Inquiry Information
Minimum order quantity: 1K (1,000 pcs); sample lead time is generally 3-4 working days, and volume production lead time is generally 10-15 working days (subject to order confirmation). For volume pricing, use the inquiry form on this page or call/message us on WeChat at 139 2571 4318. Specify the exact model and quantity in your inquiry.
Selection Recommendations
Through-hole LED lead polarity is long lead positive and short lead negative. Recommended soldering conditions are within 260℃/3 seconds. Forward voltage varies by color (1.8~3.4V); select the current-limiting resistor for the actual color.
Related Reading: LED Indicator Part Number Comparison Table (Complete 2026 Edition) ｜ Datasheet Download Center
Note: The parameters on this page were compiled against product documentation on 2026-09-17. Items not provided in a datasheet are not assigned uniform values. Refer to the datasheet for the relevant part number.
