Industry's Highest* Brightness SEP1xx1L Series
Suitable for Black-out Design for Automotive Interiors
The SEP1xx1L series are ultra-high brightness LEDs that achieve not only high reliability but also high efficiency and high-brightness for automotive interiors.
Above all, this series is ideal for backlights using blacked-out instrument panels with low light transmission rates.
The new LED devices achieve industry-leading* ultra-high brightness by combining our new technologies: a structure with high heat dissipation, reflector resin with high heat/light resistance, and an LED chip with high heat resistance.
* Based on our survey about SEP1WC1L19DTA as of May 2025.
Features
- Ultra-high brightness
- Automotive-grade qualified
- Standard size for automotive 2.8 mm × 3.5 mm × 0.7 mm
- Thermally enhanced surface-mount package
- ESD-protection Zener diode included
- No light-scattering sheet or lens embossing required
Applications
For automotive interior applications such as:- Blacked-out instrument panel display with low light transmission
- Footlight and other lighting equipment
Enhanced Heat Dissipation
The new structure transfers chip-generated heat directly under the chip, allowing shorter heat dissipation paths and larger heatsinks.
This significantly improves the thermal resistance θ(J-S) from 100 °C/W in the existing construction to 25 °C/W.
Industry's Highest* Brightness
The built-in chip has a junction temperature, TJ(max.), of 150 °C, which is improved from 125 °C of our existing series.This enables the new devices to support ambient temperatures, (TA) up to 110 °C.
Using reflector resin with higher heat resistance allows the SEP1xx1L series to operate at higher currents.
As a result, the SEP1WC1L19DTA achieves the industry's highest* luminous intensity which is nearly 1.6 times higher than our existing products.
The series suppresses the deterioration of brightness during long-term operation by using high-reflective Ag plating and silicone encapsulation resin to prevent Ag sulfuration.
Suitable for Backlight in Black-out Design
Black-out design, with its stylish and luxurious appearance, is increasingly used in instrument panels.
In the black-out design, the instrument panel is all black and blends in with the interior when the power is off. When the power is on, the icons for the control buttons appear on the panel.
The light transmission of materials in the existing design is 40 to 50%, whereas it is as low as about 10% in black-out design, requiring LEDs with ever higher luminous intensity as the light source for the backlight.
In this design, the luminous intensity required for white LEDs is more than 4,000 mcd, which is double that of existing designs.
The SEP1WC1L19DTA achieves high luminous intensity and the high reliability required for automotive products, making it ideal for backlight sources in black-out design.
The SEP1xx1L series also offers various LED colors other than white, which achieve about twice the luminous intensities of the existing devices.
| Existing Panel | Blacked-out Instrument Panel | |
|---|---|---|
| Design |  |
 |
| Light Transmission of Materials |
40 to 50% | About 10 % |
| Required Performance for LEDs |
・Luminous Intensity 2,000 mcd ・TJ(max.) 125 °C |
・Luminous Intensity More Than 4,000 mcd ・TJ(max.) 150 °C ⇒ The SEP1xx1L series is suitable |
SEP1xx1L Series Selection Guide
| Emitting Color | Part Number / Data Sheet | Luminosity（IF） | Chromaticity（x, y） | IF (max.) |
|---|---|---|---|---|
| White | SEP1WA1L19DA**  | 4300 mcd (30 mA) | 0.310, 0.315 | 80 mA |
| SEP1WC1L19DTA | 3500 mcd (30 mA) | 0.267, 0.279 | 80 mA | |
| Blue | SEP1E1L21DA** | 3100 mcd (100 mA) | 0.126, 0.061 | 150 mA |
| Pure Green | SEP1D1L19DA** | 4000 mcd (50 mA) | 0.173, 0.717 | 80 mA |
| Green | SEP1P41L19DA** | 8400 mcd (50 mA) | 0.390, 0.580 | 80 mA |
| Yellow | SEP1P71L19DA** | 7700 mcd (50 mA) | 0.440, 0.540 | 80 mA |
| Orange | SEP1P91L19DA** | 5100 mcd (50 mA) | 0.580, 0.410 | 80 mA |
| Amber | SEP1P81L19DA** | 3200 mcd (50 mA) | 0.640, 0.350 | 80 mA |
| Red | SEP1P21L21DA** | 5100 mcd (150 mA) | 0.688, 0.309 | 240 mA |
If you are looking for more than what the standard products can offer,
we can provide custom production of LEDs specialized for your needs.
Please see below for details.
Questions or Comments?
Please feel free to contact us if you cannot find the desired product from the lineup.