Vishay Semiconductor Opto Division TLHA44R1S2

Overview

TLHA44R1S2 from Vishay Semiconductors is an orange-red AlInGaP-on-GaAs LED in a 3 mm tinted total diffused package, delivering 112–280 mcd luminous intensity at 20 mA, with dominant wavelength 612–625 nm and ±30° viewing angle-designed for high-contrast status indication and legend lighting.

For engineers reviewing the TLHA44R1S2 datasheet, TLHA44R1S2 pinout, TLHA44R1S2 application, or TLHA44R1S2 equivalent, key selection criteria include luminous intensity binning (R1/S2), forward voltage range (2.0–2.6 V), thermal resistance (400 K/W), ESD rating (2 kV HBM), and compatibility with DC and pulsed drive up to 0.5 A surge current.

Technical Context

The TLHA44R1S2 uses AlInGaP epitaxial technology on GaAs substrate to achieve high-efficiency orange-red emission with narrow spectral width and stable chromaticity across temperature. Its total-diffused 3 mm package ensures uniform Lambertian radiation pattern and wide ±30° half-intensity angle.

Designed for ambient operation from –40 °C to +100 °C, the device supports continuous DC drive up to 30 mA and transient surge currents up to 500 mA (10 μs pulse), with junction-to-ambient thermal resistance of 400 K/W enabling reliable performance in compact indicator layouts without active cooling.

Key Specifications

Pinout & Package

Package: 3 mm (T-1) tinted total diffused plastic package per drawing 6.544-5255.01-4; Ø3.2 ±0.15 mm body, 5.8 ±0.3 mm overall length, 2.54 mm lead spacing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED indicator applications.

Compared with TLHR4400 and SML-010PTT86R, the TLHA44R1S2 uniquely combines orange-red chromaticity, R1/S2 intensity binning, and through-hole 3 mm mechanical compatibility-making it optimal for legacy panel indicator upgrades and color-critical status applications where visual consistency matters.

Availability

TLHA44R1S2 is available at Aetrix Electronics and suitable for status lights, off/on indicators, and legend lighting requiring stable component supply, consistent luminous intensity binning, and wide-angle visibility in industrial and consumer interfaces.

Supply support for TLHA44R1S2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Intertechnology is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.

The TLHA44R1S2 belongs to Vishay's standard 3 mm LED product line, engineered for cost-effective, high-visibility status indication in environments demanding wide viewing angles, stable chromaticity, and robust handling tolerance.

FAQ

What is the luminous intensity range of the TLHA44R1S2 at 20 mA?

The TLHA44R1S2 has a luminous intensity range of 112–280 mcd at 20 mA DC, corresponding to its R1 (112–140 mcd) and S2 (224–280 mcd) intensity bins. This binning allows designers to select consistent brightness levels across production batches without post-assembly sorting. The TLHA44R1S2 datasheet specifies these values under standardized 25 ms pulse testing with ±11% measurement accuracy.

What does the "R1S2" suffix indicate in TLHA44R1S2?

The "R1S2" suffix denotes that the TLHA44R1S2 is shipped in either R1 or S2 luminous intensity bins-R1 covers 112–140 mcd, S2 covers 224–280 mcd. Each bag contains only one bin; mixing is prohibited to ensure brightness consistency. The TLHA44R1S2 ordering code reflects this dual-bin availability, not simultaneous inclusion of both groups.

Can TLHA44R1S2 be driven with pulsed current, and what are the limits?

Yes, the TLHA44R1S2 supports pulsed operation with peak forward current up to 0.5 A for pulses ≤10 μs (IFSM). Pulse testing follows JEDEC standards, and the device maintains stable optical output under short-duration surges. For reliable lifetime, average current must remain ≤30 mA, and thermal management must respect the 400 K/W junction-to-ambient resistance. The TLHA44R1S2 is explicitly rated for both DC and high-peak-current use.

What is the dominant wavelength specification for TLHA44R1S2, and why does it matter?

The dominant wavelength of TLHA44R1S2 is 612–625 nm, placing it in the orange-red region of the visible spectrum. This range ensures high photopic contrast against common panel materials and meets color-coding requirements in industrial and medical interfaces. Unlike peak wavelength (624 nm typ.), dominant wavelength correlates directly with human color perception-making it critical for TLHA44R1S2 applications where visual distinction between states (e.g., "warning" vs. "normal") depends on hue fidelity.

Is TLHA44R1S2 compatible with lead-free reflow soldering processes?

The TLHA44R1S2 is qualified for lead-free soldering at 260 °C for ≤5 seconds at 2 mm from the package body, per its absolute maximum ratings. Its plastic housing and internal wire bonds are designed to withstand this thermal profile without delamination or parameter shift. However, as a through-hole device, it is typically wave-soldered-not reflowed-and the 260 °C rating applies to repair or hybrid assembly scenarios. Always verify process compatibility using the TLHA44R1S2 datasheet revision 1.6.