LED RGB 3.0x3.0x0.65mm Specification - Forward Voltage 2.2-3.6V - Power 0.15-0.22W - Automotive Interior Lighting

1. Product Overview

The RF-A2E31-RGB9-W1 is a compact, high-performance RGB LED designed for demanding automotive interior lighting applications. Housed in a 3.0mm x 3.0mm x 0.65mm EMC (Epoxy Molding Compound) package, this component integrates separate red, green, and blue chips to deliver a wide color gamut. The product is qualified according to AEC-Q101 stress test guidelines for automotive grade discrete semiconductors, ensuring exceptional reliability under harsh operating conditions. With a typical forward current of 60mA per channel, it offers balanced luminous output: red (7-11 lm), green (15-22 lm), and blue (3-7 lm). The wide 120° viewing angle makes it ideal for uniform interior illumination, while the moisture sensitivity level of 2 ensures robust handling during SMT assembly.

2. Technical Parameters and Analysis

2.1 Electrical and Optical Characteristics

At a solder temperature of 25°C and forward current of 60mA, the RGB LED exhibits the following key parameters:

• Forward Voltage (Vf): Red: 2.2V – 2.8V; Green: 3.0V – 3.6V; Blue: 3.0V – 3.6V. The tight voltage bins help simplify current balancing in multi-LED designs.
• Luminous Flux (Φ): Red: 7.0 – 11.0 lm; Green: 15.0 – 22.0 lm; Blue: 3.0 – 7.0 lm. The green channel provides the highest flux to compensate for lower human eye sensitivity in that spectral region.
• Dominant Wavelength (λD): Red: 615 – 625 nm; Green: 515 – 530 nm; Blue: 460 – 470 nm. These narrow bins guarantee consistent color mixing for RGB systems.
• Reverse Current (IR): ≤2 µA at VR=5V, confirming low leakage.
• Viewing Angle (2Θ1/2): 120° (typical), providing wide spatial distribution.

2.2 Absolute Maximum Ratings

Design must ensure that the following limits are never exceeded:

• Power Dissipation: Red 150 mW, Green/Blue 210 mW per channel.
• Forward Current: 60 mA DC (120 mA peak at 1/10 duty, 10 ms pulse).
• Reverse Voltage: 5 V.
• ESD (HBM): 2000 V (with >90% yield at 8000 V, but ESD protection is still required).
• Operating Temperature: -40°C to +125°C; Storage: same; Junction Temperature: 125°C max.

2.3 Thermal Characteristics

The thermal resistance from junction to solder point (RTHJ-S) is: Red 55°C/W, Green 46°C/W, Blue 43°C/W. The lower thermal resistance of the green and blue channels reflects their higher power dissipation. Adequate PCB heat sinking is critical to keep junction temperatures below the maximum rating, especially when all three channels are operated simultaneously.

3. Binning System and Selection

3.1 Forward Voltage Bins

At 60mA, the devices are sorted into voltage bins for each color:

• Red: D0 (2.2-2.4V), E0 (2.4-2.6V), F0 (2.6-2.8V)
• Green: H0 (3.0-3.2V), I0 (3.2-3.4V), J0 (3.4-3.6V)
• Blue: same as green (H0, I0, J0)

3.2 Luminous Flux Bins

Flux bins allow selection for brightness consistency:

• Red: QB1 (7-11 lm)
• Green: QC1 (15-22 lm)
• Blue: QA1 (3-7 lm)

3.3 Wavelength Bins

Dominant wavelength is sorted into narrow ranges:

• Red: P (615-620 nm), Q (620-625 nm)
• Green: J (515-520 nm), K (520-525 nm), L (525-530 nm)
• Blue: J (460-465 nm), K (465-470 nm), L (470-475 nm)

The combination of voltage, flux, and wavelength bins enables customers to order tight-tolerance LEDs for high-end automotive lighting modules where color uniformity is critical.

4. Performance Curve Interpretation

4.1 Forward Voltage vs. Current

The Vf-I curve shows typical diode behavior. At 60mA, red has a lower voltage (around 2.2-2.4V) compared to green/blue (around 3.2-3.4V). The curves are linear in the operating region, making it easy to predict current variation with small voltage shifts. Designers must include series resistors to limit current and prevent thermal runaway.

4.2 Relative Intensity vs. Current

Relative luminous flux increases nearly linearly with current up to 60mA. At lower currents, the efficiency is slightly higher for all colors. This curve aids in dimming design: using PWM or analog current control will produce proportional brightness changes.

4.3 Temperature Effects

As solder temperature rises, forward voltage decreases (negative temperature coefficient). For a system operating at 85°C, the Vf may drop by 0.2-0.3V, potentially increasing current if the driving voltage remains constant. Thermal derating curves show that the maximum allowable forward current must be reduced at high temperatures to keep the junction below 125°C.

4.4 Spectral Distribution

The emission spectra show narrow peaks centered at 620nm (red), 520nm (green), and 465nm (blue). The full width at half maximum is approximately 20-30nm for each channel, enabling good color purity for mixing white light or saturated colors.

4.5 Radiation Pattern

The spatial radiation diagram indicates a typical Lambertian distribution with half-intensity at ±60°, confirming the wide 120° viewing angle. This pattern ensures uniform illumination when the LEDs are placed in arrays or light guides.

5. Mechanical and Packaging Specifications

5.1 Package Dimensions

The LED is a surface-mount package with dimensions 3.0 mm × 3.0 mm × 0.65 mm (tolerance ±0.2 mm). The bottom view shows six solder pads: pads 1 (R+), 2 (R-), 3 (G+), 4 (G-), 5 (B+), 6 (B-). Polarity is clearly marked on the package with a cathode notch. The recommended soldering pattern includes thermal pads for heat dissipation.

5.2 Carrier Tape and Reel

Devices are supplied in 8mm wide carrier tape with 4000 pieces per reel. The tape has a pocket pitch of 4mm and a cover tape sealed on top. The reel diameter is 330mm (standard 13-inch reel). The moisture barrier bag includes a desiccant and humidity indicator card.

5.3 Label Information

Each reel is labeled with part number, spec number, lot number, bin codes for luminous flux, dominant wavelength, forward voltage, quantity, and date code. This traceability is essential for automotive quality requirements.

6. Soldering Guidelines and Recommendations

6.1 Reflow Profile

The recommended lead-free reflow profile:

• Ramp-up rate: ≤3°C/s
• Preheat: 150°C to 200°C in 60-120 seconds
• Time above 217°C: ≤60 s
• Peak temperature: 260°C (max 10 s within 5°C of peak)
• Cooling rate: ≤6°C/s
• Total time from 25°C to peak: ≤8 minutes

Only two reflow passes are allowed, and the interval between passes should not exceed 24 hours to avoid moisture absorption damage.

6.2 Handling Precautions

Because the encapsulant is silicone, the top surface is relatively soft. Nozzle pressure must be minimized during pick-and-place. The PCB should be flat before and after soldering; bending can cause solder joint fractures. Avoid rapid cooling after reflow to prevent thermal shock.

7. Packaging and Ordering Information

Standard packaging is 4000 pcs per reel in sealed moisture barrier bags. Storage conditions: before opening bag, temperature ≤30°C and humidity ≤75% for up to one year from date code. After opening, use within 24 hours at ≤30°C/≤60% RH. If the bag is damaged or storage conditions are exceeded, bake the parts at 60±5°C for >24 hours before use.

8. Application Guidance

8.1 Typical Applications

This LED is optimized for automotive interior lighting, including:

• Dashboard ambient lighting
• Footwell and door handle illumination
• Reading lights with RGB color tuning
• Logo projection and decorative accents

8.2 Circuit Design Considerations

Each channel must have a current-limiting resistor (or constant-current driver) to ensure the forward current never exceeds 60 mA. Since Vf varies with temperature, a series resistor provides negative feedback: as Vf decreases with heat, current increases, but the resistor limits this rise. For accurate color mixing, use PWM at a frequency above 200 Hz to avoid visible flicker. Ensure the power supply can provide adequate current for all channels simultaneously – a typical RGB design may draw up to 180 mA total (60 mA × 3).

8.3 Thermal Management

With total power dissipation up to 0.57 W (when all channels are at maximum current and voltage), a thermal vias pattern under the package is recommended. The PCB copper area should be at least 200 mm² per LED to keep solder temperature below 85°C. Junction temperature must stay under 125°C to guarantee reliability.

9. Comparison with Alternative RGB LEDs

9.1 Versus 3528 or 2835 Packages

Compared to common 3.5×2.8 mm (3528) or 2.8×3.5 mm (2835) packages, the 3.0×3.0 mm footprint offers a pin-compatible form factor with higher thermal dissipation due to the central thermal pad. The EMC package provides better resistance to sulfur corrosion than traditional PPA packages, making it suitable for automotive environments where outgassing from materials is a concern.

9.2 versus Ceramic Packages

Ceramic PKGs offer even lower thermal resistance but at higher cost. The EMC package of this LED gives a good balance between thermal performance (43-55 °C/W) and cost, adequate for automotive interior applications where ambient temperatures rarely exceed 85°C.

10. Frequently Asked Technical Questions

Q: Can I drive all three channels at 60 mA simultaneously without additional cooling?
A: At 25°C ambient, yes, but thermal design must ensure the PCB can dissipate ~0.6W per LED. For arrays, consider spacing and forced air if needed.

Q: What is the typical color rendering index (CRI) when mixing white?
A: This RGB LED is not designed for high CRI white; typical CRI is around 60-70. For white with high CRI, use phosphor-converted white LEDs.

Q: How should I clean the LED after soldering?
A: Use isopropyl alcohol. Do not use ultrasonic cleaning or solvents that may attack the silicone.

Q: What is the minimum recommended current for stable color?
A: Down to 10 mA per channel, but color variation may occur due to current-dependent wavelength shift (typically <3 nm). Use PWM at low duty cycles for deep dimming.

11. Practical Design Case: RGB Ambient Light Module

Consider a five-LED array for a car dashboard ambient strip. Each LED requires 180 mA total (60×3). A constant-current driver IC (e.g., TLC59116) provides 16 channels to control 5 RGB LEDs (15 channels total). The PCB layout includes a ground plane and thermal vias under each LED. For a 2-layer board, the temperature rise at 85°C ambient is measured at 10°C above ambient, keeping junctions below 115°C. The system achieves 300 lm total white output at 5000K CCT with ±200K uniformity.

12. Working Principle of RGB LEDs

This LED integrates three separate semiconductor chips: red (AlInGaP or similar), green (InGaN), and blue (InGaN). Each chip emits monochromatic light when forward biased. The human eye perceives the mixture of the three primary colors as a broad range of colors. The EMC package encapsulates the chips with a clear silicone lens that also acts as a primary optic for light extraction. The six-pad configuration allows independent current control per channel, enabling additive color mixing.

13. Technology Trends and Future Outlook

Automotive lighting is moving toward advanced adaptive lighting and personalized ambient environments. RGB LEDs with EMC packages are preferred due to their small size, high reliability, and compatibility with reflow soldering. Future developments include higher flux per chip (e.g., 30 lm for green), integrated drivers in the same package, and improved thermal resistance below 30°C/W. The trend toward autonomous vehicles will increase demand for customizable interior lighting, making high-performance RGB LEDs like the RF-A2E31-RGB9-W1 a building block for next-generation cabin experiences.