LTW-1NHDR5JH231 LED Lamp Datasheet - White Diffused Lens - 20mA Forward Current - 3.2V Typical Voltage - English Technical Document

1. Product Overview

The LTW-1NHDR5JH231 is a through-hole LED lamp designed for use with a black or natural plastic right-angle holder (housing), also known as a Circuit Board Indicator (CBI). This configuration provides a solid-state light source suitable for various electronic applications. The product is designed for ease of assembly onto printed circuit boards (PCBs).

1.1 Features

• Designed for ease in circuit board assembly.
• Solid-state light source for reliability.
• Low power consumption and high efficiency.
• Lead-free product compliant with RoHS directives.
• Utilizes a T-1 size lamp with an InGaN white LED and a white diffused lens.

1.2 Applications

This LED lamp is suitable for a wide range of applications, including but not limited to:

• Computer equipment
• Communication devices
• Consumer electronics
• Industrial equipment

2. Outline Dimensions

The mechanical drawing for the LTW-1NHDR5JH231 is provided on page 2 of the datasheet. Key notes regarding the dimensions include:

• All dimensions are specified in millimeters, with inches in parentheses.
• The default tolerance is ±0.25mm (±0.010\") unless otherwise stated.
• The holder material is black plastic.
• The LED lamp itself is white in color.
• All specifications are subject to change without prior notice.

3. Absolute Maximum Ratings

The following ratings are specified at an ambient temperature (TA) of 25°C. Exceeding these values may cause permanent damage to the device.

4. Electrical and Optical Characteristics

The following characteristics are measured at TA=25°C under the specified test conditions.

Notes:

1. Luminous intensity is measured with a sensor and filter approximating the CIE photopic eye-response curve.
2. θ1/2 is the off-axis angle where luminous intensity is half the axial value.
3. The Iv classification code is marked on each packing bag.
4. The Iv guarantee includes a ±15% tolerance.
5. Chromaticity coordinates (x, y) are derived from the 1931 CIE chromaticity diagram.
6. The reverse voltage condition is for IR testing only; the device is not designed for reverse operation.

5. Typical Electrical and Optical Characteristic Curves

The datasheet includes typical characteristic curves (shown on page 4) illustrating the relationship between various parameters. These curves are essential for understanding device performance under different operating conditions, such as forward current vs. luminous intensity and forward voltage. Analyzing these curves helps designers optimize drive circuits for consistent brightness and efficiency across a range of operating points.

6. Binning System Specification

The LTW-1NHDR5JH231 is classified according to optical and electrical bins to ensure consistency in applications.

6.1 Optical and Electrical Bin Table

Luminous Intensity Bins (Iv, mcd @ IF=20mA)

Note: Tolerance of each bin limit is ±15%.

Hue Ranks (Chromaticity Coordinates, CC(x,y) @ IF=20mA)

The datasheet provides a detailed table (on page 6) defining multiple hue ranks (A1, A2, B1, B2, C1, C2, D1, D2). Each rank is defined by a quadrilateral area on the CIE 1931 chromaticity diagram using four sets of (x, y) coordinates. This allows for precise color selection. The tolerance for each bin limit is ±0.01 in coordinate value.

6.2 C.I.E. 1931 Chromaticity Diagram

A reference CIE 1931 chromaticity diagram is included (on page 7) to visually represent the hue bins defined in the table. This diagram is a standard tool for specifying and understanding the color of light sources.

7. Packaging Specification

The standard packing configuration for the LTW-1NHDR5JH231 is as follows:

• Base Unit: 180 pieces per tray.
• Inner Carton: 8 trays per inner carton, totaling 1,440 pieces.
• Outer Carton: 8 inner cartons per outer carton, totaling 11,520 pieces.

A note specifies that in every shipping lot, only the final pack may be a non-full pack.

8. Cautions and Application Guidelines

8.1 Application

This LED lamp is suitable for indoor and outdoor signage, as well as ordinary electronic equipment.

8.2 Storage

For optimal longevity, LEDs should be stored in an environment not exceeding 30°C or 70% relative humidity. LEDs removed from their original packaging should be used within three months. For extended storage outside the original packaging, they should be kept in a sealed container with desiccant or in a nitrogen ambient.

8.3 Cleaning

If cleaning is necessary, use alcohol-based solvents such as isopropyl alcohol.

8.4 Lead Forming and Assembly

• Bend leads at a point at least 3mm from the base of the LED lens.
• Do not use the base of the lead frame as a fulcrum.
• Perform lead forming at normal temperature and before soldering.
• During PCB assembly, use minimal clinch force to avoid mechanical stress.

8.5 Soldering

Critical soldering guidelines must be followed to prevent damage:

• Maintain a minimum clearance of 2mm from the base of the lens/spacer to the solder point.
• Avoid dipping the lens/spacer into solder.
• Do not apply external stress to the lead frame during soldering while the LED is hot.

Recommended Soldering Conditions:

Warning: Excessive temperature or time can deform the lens or cause catastrophic failure.

8.6 Drive Method

LEDs are current-operated devices. To ensure uniform brightness when connecting multiple LEDs in parallel, it is strongly recommended to use a current-limiting resistor in series with each LED (Circuit Model A). Using a single resistor for multiple parallel LEDs (Circuit Model B) is not recommended, as slight variations in forward voltage (VF) between individual LEDs can lead to significant differences in current and, consequently, brightness.

9. Design Considerations and Application Notes

9.1 Thermal Management

While the device has a relatively low power dissipation (108mW max), proper thermal design is still important for long-term reliability, especially when operating near maximum ratings or in high ambient temperatures. The derating factor of 0.45 mA/°C above 30°C must be considered to ensure the DC forward current does not exceed safe limits. Adequate spacing on the PCB and possible airflow can help manage junction temperature.

9.2 Circuit Design for Consistent Brightness

The binning system for luminous intensity (Iv) and chromaticity (x, y) is a key feature for applications requiring color or brightness consistency. Designers should specify the required bins when ordering. Furthermore, as highlighted in the drive method section, the use of individual series resistors for each LED is the most reliable way to achieve uniform brightness in multi-LED arrays, compensating for the natural distribution in the LED's forward voltage characteristic.

9.3 Mechanical Integration

The product is designed for use with a specific right-angle holder (CBI). Designers must ensure the PCB layout accommodates the holder's footprint and the recommended keep-out area for soldering (2mm from the lens base). The instructions for lead forming and minimal clinch force are critical to avoid imposing mechanical stress on the LED package, which could lead to premature failure or cracked lenses.

10. Comparison and Selection Guidance

The LTW-1NHDR5JH231 offers a combination of a standard T-1 lamp with a dedicated holder system. Its primary advantages include ease of assembly and the availability of a right-angle viewing option via the holder. The detailed binning structure allows for precise selection for applications where color or intensity matching is critical. When selecting an LED, key parameters to compare include luminous intensity (Iv), viewing angle, forward voltage (VF), and the associated maximum ratings (current, power, temperature). This device's typical forward voltage of 3.2V at 20mA is common for white InGaN LEDs, making it compatible with standard logic-level power supplies when used with an appropriate current-limiting resistor.