Vishay Semiconductor Opto Division TLHO4400

Overview

TLHO4400 from Vishay Semiconductors is a soft orange visible-light LED in a standard Ø 3 mm tinted diffused plastic package (T-1), with dominant wavelength 598–611 nm, luminous intensity 1.6–13 mcd at 10 mA, and forward voltage 2.4 V (typ.) at 20 mA. It delivers high on-off contrast for front-panel status indication in industrial control panels and instrumentation.

For engineers reviewing the TLHO4400 datasheet, TLHO4400 pinout, TLHO4400 application, or TLHO4400 equivalent, this page provides verified optical, electrical, and mechanical specifications - including viewing angle (±30°), absolute maximum ratings (IF = 30 mA, VR = 6 V), and luminous intensity binning - to support reliable visual indicator design and BOM selection.

Technical Context

The TLHO4400 uses GaAsP-on-GaP epitaxial technology to produce soft orange light with tightly controlled dominant wavelength (598–611 nm) and peak wavelength (~605 nm). Its ±30° angle of half intensity enables wide-angle visibility while maintaining directional contrast for discrete indicator use.

Rated for DC and pulsed operation up to 1 A surge current (tp ≤ 10 μs), it supports both steady-state panel lighting and transient status signaling. Luminous intensity is binned per group (M-group: 1.6–3.2 mcd), ensuring consistent appearance across units in a single packaging unit.

Key Specifications

Pinout & Package

TLHO4400 is housed in a standard Ø 3 mm (T-1) tinted diffused plastic package with axial leads. Cathode is identified by shorter lead and/or flat edge on lens housing per Vishay mechanical drawing 6.544-5255.01-4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar visible-light indicator applications.

Compared with TLHR4400 and TLHY4400, the TLHO4400 occupies a distinct chromatic niche-softer and less saturated than red or yellow-making it ideal for non-critical status where visual calm and reduced eye strain are prioritized without compromising detectability.

Availability

TLHO4400 is available at Aetrix Electronics and suitable for industrial HMI status lights, medical device indicators, and test equipment legend illumination requiring stable component supply, consistent luminous intensity binning, and long-term obsolescence management.

Supply support for TLHO4400 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability optoelectronics, power MOSFETs, diodes, and resistive components for industrial, automotive, and computing applications.

The TLHO4400 belongs to Vishay's TLH.44.. series of standard-indicator LEDs, designed specifically for general-purpose visual signaling where consistent color, wide viewing angle, and mechanical interchangeability are essential.

FAQ

What is the dominant wavelength range of the TLHO4400?

The TLHO4400 has a dominant wavelength range of 598–611 nm, placing its soft orange output between red and yellow in the visible spectrum. This range is measured at 10 mA forward current and ensures consistent hue across units shipped in the same bag, supporting uniform panel appearance in multi-LED installations.

Can TLHO4400 be driven directly from a 3.3 V microcontroller GPIO?

Yes - the TLHO4400 has a typical forward voltage of 2.4 V at 20 mA, allowing direct drive from a 3.3 V GPIO with a series current-limiting resistor (e.g., 100 Ω for ~9 mA). Ensure GPIO sink/source capability meets required current and verify thermal dissipation remains within 100 mW limit at ambient ≤60 °C.

Is TLHO4400 RoHS-compliant and halogen-free?

Yes - TLHO4400 complies with RoHS Directive 2011/65/EU and is halogen-free per Vishay's material categorization standard (document 99912). Full compliance data, including substance declarations and test reports, is available upon request through Aetrix Electronics' technical support team.

What does the "M" intensity group mean for TLHO4400?

The "M" group indicates a luminous intensity range of 1.6–3.2 mcd at 10 mA. Within each TLHO4400 packaging unit, all devices fall strictly within this bin - guaranteeing IVmin/IVmax ≤ 0.5 - which eliminates visible brightness mismatch in adjacent indicators on control panels or dashboards.

Does TLHO4400 support PWM dimming, and what is its maximum recommended duty cycle?

Yes - TLHO4400 supports PWM dimming with pulse lengths ≥10 μs and duty cycles up to 50% at ambient ≤65 °C (per Fig. 2). For continuous operation, keep average forward current ≤30 mA; at 100 Hz PWM, peak current may reach 1 A (tp ≤ 10 μs) without degradation, enabling crisp flash signaling.