LTPL-G35UVC275PR UVC LED Datasheet - Size 3.5x3.5x1.2mm - Typical Voltage 5.9V - Maximum Power 2.0W - Peak Wavelength 274nm - Simplified Chinese Technical Document

1. Product Overview

The LTPL-G35UVC product series represents a significant advancement in the field of solid-state ultraviolet light sources for sterilization and medical applications. This product combines the inherent advantages of Light Emitting Diode (LED) technology, such as long service life and high reliability, with performance levels sufficient to replace traditional ultraviolet light sources. Its design aims to provide design flexibility and open up new applications in areas requiring effective UVC irradiation.

Key features of this product include: compatibility with Integrated Circuit (I.C.) drive systems, compliance with the RoHS (Restriction of Hazardous Substances) directive ensuring lead-free construction, and lower overall operational and maintenance costs compared to traditional UV technologies such as mercury lamps. Primary target markets include equipment manufacturers in fields such as medical devices, water purification, air sterilization, and surface disinfection.

2. Zurfafin Fahimtar Sigogi na Fasaha

2.1 Matsakaicin Matsakaici na Cikakke

Don yin da tabbatar da aminci, na'urar ta ƙayyade aiki a ƙarƙashin matsanancin yanayi da iyakokin lantarki. Matsakaicin matsakaicin ƙididdiga an auna shi a yanayin zafin jiki (Ta) na 25°C, yana bayyana iyakokin da suka wuce wannan kewayon na iya haifar da lalacewa ta dindindin.

• Yin amfani da wutar lantarki (Po):Matsakaicin 2.0 Watts. Wannan shine jimillar zafi da fakit ɗin zai iya ɓata.
• Halin yanzu na gaba na DC (IF):Matsakaicin 300 milliamps.
• Kewayon zafin aiki (Topr):-40°C zuwa +80°C. Na'urar tana aiki a cikin wannan faɗin taga na zafin jiki.
• Kewayon zafin ajiya (Tstg):-40°C to +100°C.
• Junction Temperature (Tj):Maximum 105°C. The temperature of the semiconductor chip itself must not exceed this limit.

An important note warns against operating the LED under prolonged reverse bias conditions, as this may lead to device failure.

2.2 Halayen Haske da Lantarki

Core performance metrics are defined under the conditions of Ta=25°C and a test current (If) of 250mA (considered the typical operating point).

• Forward Voltage (Vf):Typical value is 5.9V, minimum is 5.2V, maximum is 7.7V. Measurement tolerance is ±0.1V.
• Radiant Flux (Φe):This is the total optical power output within the UVC spectral range. Typical value is 35.0 milliwatts (mW), minimum is 25.0 mW. Measurement tolerance is ±10%.
• Peak Wavelength (λp):The wavelength at which the LED emits its strongest optical power. Typical value is 274 nanometers (nm), ranging from 265nm to 280nm. Tolerance is ±3nm. This places it definitively within the UVC band (200-280nm), which is known for its germicidal efficacy.
• Viewing Angle (2θ1/2):Typical value is 120 degrees, defining the angular distribution of the emitted radiation.
• Thermal Resistance (Rth j-s):The typical thermal resistance from the semiconductor junction to the solder point is 16.8 K/W. This parameter is crucial for thermal management design. Reference measurements use a specific aluminum-based metal core printed circuit board (MCPCB).
• Electrostatic Discharge (ESD) Sensitivity:Withstands up to 2000V according to the Human Body Model (JESD22-A114-B), indicating moderate ESD robustness, but careful handling is still required.

3. Bayanin Tsarin Rarrabawa

To ensure consistency in application design, LEDs are binned according to key parameters. The binning code is marked on the packaging.

3.1 Rarrabawar Ƙarfin Lantarki Mai Kyau (Vf)

LEDs are divided into five bins (V1 to V5) based on their forward voltage at 250mA. Each bin covers a 0.5V range, from 5.2-5.7V (V1) to 7.2-7.7V (V5). The tolerance within each bin is ±0.1V. This allows designers to select LEDs with similar electrical characteristics for parallel connection or current-sharing circuits.

3.2 Rarrabawar Yawan Haske (Φe)

The optical output power is categorized into four classes (X1 to X4). For example, the X2 bin covers LEDs with a radiant flux between 30.0 mW and 35.0 mW at 250mA. The X4 bin specifies a minimum of 40.0 mW. The tolerance is ±7%. This binning is crucial for applications requiring a specific minimum irradiation dose.

3.3 Rarrabawar Tsawon Zango (Wp)

Currently, all devices belong to a single wavelength bin W1, which ranges from 265nm to 280nm. The tolerance is ±3nm. This ensures all devices emit within the effective germicidal range.

4. Binciken Lankwalin Aiki

The datasheet provides multiple graphs illustrating device behavior under various conditions. Unless otherwise noted, all curves are based on an ambient temperature of 25°C.

4.1 Relative Radiant Flux vs. Forward Current

This curve shows that the light output increases with the drive current, but not in a perfectly linear manner. It illustrates the relationship between electrical input and optical output, aiding in determining the optimal operating point for efficiency and output.

4.2 Relative Spectral Distribution

This graph depicts the emission spectrum, showing the light intensity at different wavelengths. It confirms the peak emission near 274nm and the spectral bandwidth, which is crucial for understanding the LED's effectiveness against specific microorganisms.

4.3 Forward Current vs. Forward Voltage (I-V Curve)

A fundamental electrical characteristic of the diode. This curve is essential for designing the current drive circuit, as it shows the voltage required to achieve a desired current.

4.4 Relative Radiant Flux vs. Junction Temperature

This key curve shows how light output decreases as the junction temperature (Tj) increases. Effective thermal management is essential for maintaining high output power throughout the LED's lifetime.

4.5 Radiometric Characteristics (Spatial Distribution)

A polar diagram illustrating the angular intensity distribution, confirming a 120-degree viewing angle. This is crucial for optical system design to ensure uniform illumination of the target surface.

4.6 Forward Current Derating Curve

This graph defines the maximum allowable forward current as a function of ambient temperature. As temperature rises, the maximum safe current decreases to prevent the junction temperature from exceeding its 105°C limit.

4.7 Forward Voltage vs. Junction Temperature

Yana nuna alaƙar tsakanin farashin gaba da zafin haɗin gwiwa na semiconductor, wanda za'a iya amfani da shi don sa ido kai tsaye kan zafin jiki ko fahimtar halayen dogaro da zafin jiki.

5. Mechanical and Package Information

5.1 Girman siffar waje

LED an kunsa shi cikin murabba'i. Sai dai idan an faɗi daban, duk girmansa ana bayarwa a cikin milimita, tare da daidaitaccen ƙima na ±0.2mm. Girman zahiri shine mahimmin abu don tsarin PCB da haɗawa cikin samfurin ƙarshe.

5.2 Shawarar PCB gindin walda

Detailed land pattern graphics for the printed circuit board (PCB) are provided. Adhering to these recommended land dimensions and spacing is crucial for achieving reliable solder joints, proper heat transfer, and mechanical stability. The land specification tolerance is ±0.1mm.

5.3 Alamar polarity

The datasheet contains markings or diagrams indicating the anode and cathode connections. Correct polarity must be observed during assembly to prevent damage.

6. Jagorar walda da haɗawa

6.1 Shawarar Lanƙwasa Reflow

A detailed reflow soldering profile for lead-free assembly is specified. Key parameters include:

• Peak Temperature (Tp): Maximum 260°C (Recommended 245°C).
• Time Above Liquidus (217°C): 60-150 seconds.
• Preheat Temperature: 150-200°C for 60-120 seconds.
• Maximum heating and cooling rates are defined to minimize thermal stress.

Total time from 25°C to peak temperature should not exceed 8 minutes. Reflow soldering should be performed a maximum of three times.

6.2 Walda da Hannu

If hand soldering must be performed, the soldering iron tip temperature should not exceed 300°C, contact time should be limited to a maximum of 2 seconds, and the operation should be performed only once.

6.3 Tsaftacewa

Idan ana buƙatar tsaftacewa bayan haɗawa, za a iya amfani da kawai masu narkewa irin su isopropyl alcohol. Masu tsaftacewa na sinadarai da ba a ƙayyade ba na iya lalata LED encapsulation.

6.4 Hanyar Turawa

LED na'urar tuƙi ce ta halin yanzu. Don tabbatar da daidaiton fitar da haske lokacin haɗa LED da yawa, ya kamata a yi amfani da tsarin jeri, ko kuma a yi amfani da na'urar daidaita halin yanzu ta daban ga kowane reshe a layi daya. Ana ba da shawarar ƙwarai don amfani da direban halin yanzu na dindindin, maimakon tushen ƙarfin lantarki na dindindin.

7. Bayani game da Tufafi da Oda

7.1 Tufafi da Rumbun Kirtani

LEDs are supplied in embossed carrier tape on reels for automated assembly. Key packaging specifications include:

• Reel size: 7 inches.
• Maximum quantity per reel: 500 pieces.
• Minimum order quantity: 100 pieces for remainder reels.
• Carrier tape is sealed with a cover tape.
• Packaging complies with the EIA-481-1-B standard.

The specification sheet provides detailed dimensions for the carrier tape pockets and reels.

8. Shawarwari na Aikace-aikace

8.1 Yanayin Aikace-aikace na Al'ada

• Surface Disinfection:Integrated into devices for disinfecting equipment such as mobile phones, tools, or countertops.
• Water Purification:For point-of-use or point-of-entry water treatment systems to inactivate bacteria and viruses.
• Air Sterilization:Implemented in HVAC systems, air purifiers, or upper-room air disinfection devices.
• Medical Device Sterilization:Used for disinfecting the internal chambers of equipment or tools.

8.2 Design Considerations

• Thermal Management:Due to a typical thermal resistance of 16.8 K/W, designing an adequate heat sink (referencing MCPCB) is crucial to keep the junction temperature within limits and ensure long-term radiant flux output.
• Optical Design:A 120-degree viewing angle may require reflectors or lenses to collimate or efficiently direct UVC light to the target area.
• Electrical Design:Use a constant current driver suitable for the forward voltage range (5.2V-7.7V) and capable of providing up to 300mA current. Consider binning in multi-LED designs.
• Material Compatibility:Ensure that housing materials exposed to UVC radiation are resistant to degradation (e.g., some plastics may yellow or become brittle).
• Safety:UVC radiation is harmful to eyes and skin. The design must include appropriate shielding, interlocks, and warnings to prevent human exposure.

9. Reliability and Testing

9.1 Reliability Test Plan

The product undergoes a series of comprehensive reliability tests to ensure robustness under various stress conditions. Key tests include:

• Room Temperature Operating Life (RTOL):3,000 hours at 250mA, and 1,000 hours at the maximum current of 300mA.
• High/Low Temperature Storage Life (HTSL/LTSL):1,000 hours at 100°C and -40°C, respectively.
• Wet High Temperature Storage Life (WHTSL):1,000 hours at 60°C and 90% relative humidity.
• Thermal Shock (TS):100 cycles between -30°C and 85°C.

All operational life tests were conducted with the LED mounted on the specified metal heat sink.

9.2 Failure Criteria

A device is considered to have failed if, after testing and measurement at 250mA, its forward voltage increases by more than 10% from the initial value, or its radiant flux drops below 50% of the initial measurement.

10. Kwatancen Fasaha da Fa'ida

Compared to traditional germicidal lamps (e.g., low-pressure mercury lamps emitting 254nm), this UVC LED offers several significant advantages:

• Instant On/Off:LEDs can reach full output immediately, unlike fluorescent tubes which require warm-up time.
• Compact Size and Design Flexibility:The small form factor allows for integration into portable and space-constrained devices.
• Durability and Lifetime:The solid-state construction makes them more resistant to vibration and physical shock. While lifetime data is provided via reliability testing, LEDs typically offer a longer operational life than conventional tubes with proper thermal management.
• Mercury-Free:Contains no hazardous mercury, simplifying disposal and enhancing environmental safety.
• Wavelength Flexibility:The peak wavelength of 274nm effectively combats various pathogens. Narrow spectrum allows for targeted application without unnecessary radiation.
• Lower Operating Costs:Higher efficiency and longer lifespan contribute to long-term reductions in energy and replacement costs.

11. Tambayoyin da ake yawan yi (bisa sigogin fasaha)

Q: What is the typical operating current for this LED?
A: The photoelectric characteristics are specified at 250mA, which is a common operating point. The absolute maximum current is 300mA.

Q: How to ensure multiple LEDs have the same brightness?
A: Use binning information. Select LEDs from the same radiant flux (Φe) bin (e.g., X2) and drive them with the same current, preferably in a series configuration or with independent current regulation for parallel strings.

Q: Why is thermal management so important for this LED?
A: As shown in the "Relative Radiant Flux vs. Junction Temperature" curve, light output decreases significantly with increasing temperature. Exceeding the maximum junction temperature (105°C) can also lead to accelerated aging and premature failure. Proper heat dissipation is essential for performance and reliability.

Q: Can I drive this LED with a constant voltage power supply?
A: Not recommended. LEDs are current-driven devices. Due to the exponential I-V characteristic of the diode, a small variation in forward voltage (as indicated by Vf binning) causes a large change in current, leading to inconsistent output and potential overcurrent damage. Always use a constant current driver.

Q: What materials are safe to use near the LED's output window?
A: UVC radiation degrades many organic materials. For lenses, windows, and housing components in the optical path, use UVC-resistant materials such as certain grades of quartz glass, PTFE (Teflon), or specialized UVC-stable plastics.

12. Nazarin Ƙira da Amfani

Scenario: Design a portable water sterilization bottle.
A designer is creating a reusable water bottle integrated with UVC sterilization function. The LTPL-G35UVC275PR is selected for its compact size and 274nm output.
Implementation Plan:
1. Electrical Design:A small rechargeable lithium battery powers a boost converter/constant current driver, which is set to 250mA to drive an LED connected in series with the driver.
2. Thermal Design:The LED is mounted on a custom aluminum-based MCPCB, which is thermally connected to the inner metal wall of the bottle cavity, using it as a passive heat sink.
3. Optical Design:The 120-degree beam from the LED directly irradiates the water body. A reflective coating on the chamber wall improves uniformity.
4. Safety Design:The circuit includes a timer to ensure a sufficient dose is delivered (e.g., 60 seconds). A mechanical interlock prevents LED activation when the bottle cap is not fully sealed, and the chamber is opaque to block UVC leakage.
5. Component Selection:Select LEDs from the X2 or X3 luminous flux bins to guarantee minimum radiant output, and the driver specifications must handle the V1-V5 voltage range.

13. Gabatarwa kan Ka'idoji

UVC LED yana aiki bisa ka'idar haske ta lantarki a cikin kayan semiconductor. Lokacin da aka sanya ƙarfin lantarki mai kyau akan haɗin p-n, electrons da ramuka suna haɗuwa, suna sakin makamashi a cikin nau'in photons. Tsawon zangon waɗannan photons yana ƙayyade ta hanyar makamashin tazara na kayan semiconductor. Don fitar da UVC (200-280nm), ana amfani da kayan kamar Aluminum Gallium Nitride (AlGaN). An ƙera takamaiman abun da ke cikin Layer AlGaN don samar da fitarwa mai kololuwa na 274nm, wanda yayi daidai da kusan makamashin photon na 4.52 electron volts (eV). Wannan babban makamashin hasken ultraviolet yana sha ta DNA da RNA na ƙananan ƙwayoyin cuta, yana haifar da samuwar thymine dimers, wanda ke lalata kwafi kuma yana haifar da rashin aiki ko mutuwar tantanin halitta, yana ba da tasirin kashe kwayoyin cuta.

14. Development Trends

Yankin UVC LED yana ci gaba da sauri. Manyan abubuwan da ake iya gani daga wannan takamaiman da kuma kasuwa mai faɗi sun haɗa da:

• Ƙarfin fitarwa yana ƙaruwa akai-akai:Na'urori kamar LTPL-G35UVC275PR tare da fitarwa na milliwatts da yawa, suna wakiltar ci gaba daga ƙarni na farko na ƙarancin wutar lantarki. Manufar ci gaba da ci gaba ita ce samun mafi girman juzu'in radiation daga kowane fakitin.
• Haɓaka inganci (Ingancin Canjin Lantarki zuwa Hasken gani):Bincike yana mai da hankali kan rage ƙarfin lantarki na gaba da haɓaka ingancin quantum na waje (rabo na fitar da photons zuwa shigar da electrons), don rage amfani da wutar lantarki da kuma nauyin zafi.
• Reliability and Lifespan Enhancement:Ongoing innovations in materials science and packaging aim to further extend operational lifespan, making UVC LEDs more competitive against traditional lamps in high-duty-cycle applications.
• Cost Reduction:With increasing manufacturing volumes and maturing processes, the cost per milliwatt of UVC output is expected to decline, unlocking new mass-market applications.
• Wavelength Optimization:Research continues to explore the most effective wavelengths for inactivating specific pathogens (e.g., viruses vs. bacteria) and to develop LEDs that emit at these optimal wavelengths.

These trends are driving the adoption of solid-state UVC technology in an expanding range of disinfection and purification applications.