Vishay Semiconductor Opto Division TLHR5401

Overview

TLHR5401 from Vishay Semiconductors is a red 5 mm tinted diffused LED with luminous intensity of 4–12 mcd at 10 mA, dominant wavelength 612–630 nm, and ±30° viewing angle - designed for status indication, legend lighting, and on/off signaling in industrial panels and instrumentation.

For engineers reviewing the TLHR5401 datasheet, TLHR5401 pinout, TLHR5401 application, or TLHR5401 equivalent, this device requires attention to forward voltage (2–3 V @ 20 mA), absolute max reverse voltage (6 V), junction temperature limit (100 °C), and luminous intensity binning (Group P: 4–8 mcd) for consistent visual appearance across assemblies.

Technical Context

The TLHR5401 uses GaAsP-on-GaP epitaxial technology to deliver stable red emission with narrow dominant wavelength spread (612–630 nm) and low thermal drift. Its ±30° half-intensity angle ensures wide visibility without excessive lateral spill.

Rated for DC and pulsed operation (IFSM = 1 A, tp ≤ 10 μs), it supports high-peak-current drive while maintaining 100 mW power dissipation limit at Tamb ≤ 65 °C and RthJA = 350 K/W thermal resistance.

Key Specifications

Pinout & Package

TLHR5401 is housed in a standard 5 mm (T-1¾) tinted diffused plastic package with axial leads. Cathode is identified by flat edge and shorter lead per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLHR5401, TLHR5405 offers higher visibility in bright settings but increases power demand, while TLHR5400 reduces system current draw at the cost of lower optical margin - all share identical package, wavelength, and thermal specs.

Availability

TLHR5401 is available at Aetrix Electronics and suitable for status indicators, legend illumination, readout lighting, and maintenance signaling requiring stable component supply, consistent luminous output, and long-term obsolescence management.

Supply support for TLHR5401 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 semiconductor manufacturer specializing in discrete components, sensors, and optoelectronics with emphasis on reliability and precision.

The TLHR5401 belongs to Vishay's standard 5 mm LED product line, engineered for general-purpose visual indication in industrial, instrumentation, and panel-mount applications where color consistency and mechanical interchangeability are critical.

FAQ

What is the luminous intensity range of TLHR5401 and how is it binned?

The TLHR5401 has a luminous intensity range of 4–12 mcd at 10 mA and is binned into Group P (4–8 mcd). This binning ensures that all units shipped in one bag meet the same brightness specification, enabling uniform appearance in multi-LED installations without manual sorting.

What is the maximum continuous forward current for TLHR5401 and at what ambient temperature is it rated?

The TLHR5401 is rated for 30 mA DC forward current at ambient temperatures ≤ 65 °C. Above this temperature, derating is required per the forward current vs. ambient temperature curve in Figure 1 of the datasheet to maintain junction temperature ≤ 100 °C.

Does TLHR5401 have a specified peak wavelength, and how does it differ from dominant wavelength?

Yes - TLHR5401 has a peak wavelength of 635 nm (typical), distinct from its dominant wavelength range of 612–630 nm. The dominant wavelength defines perceived color under photopic vision, while peak wavelength indicates the spectral power maximum - both values confirm consistent red emission across production lots.

Can TLHR5401 be used in pulsed applications, and what is its surge current rating?

Yes - TLHR5401 supports pulsed operation with a surge forward current rating of 1 A for pulse widths ≤ 10 μs. This enables use in multiplexed displays or blinking indicators without compromising long-term reliability, provided average power remains within 100 mW limits.

What is the thermal resistance junction-to-ambient (RthJA) for TLHR5401, and why does it matter in PCB layout?

The TLHR5401 has an RthJA of 350 K/W. This high value means minimal heat conduction from die to ambient - so PCB copper area or airflow has negligible effect on thermal performance. Designers should focus instead on current limiting and ambient temperature control rather than thermal pad design.