Vishay Semiconductor Opto Division TLDR5400

Overview

TLDR5400 from Vishay Semiconductors is a high-intensity deep red LED using GaAlAs-on-GaAs double heterojunction technology, housed in a 5 mm tinted diffused package with ±30° viewing angle and 648 nm dominant wavelength at 20 mA. It delivers 35–70 mcd luminous intensity at 20 mA forward current and operates with low 1.8–2.2 V forward voltage, suitable for battery-powered indicators and ambient-light-resistant displays.

For engineers reviewing the TLDR5400 datasheet, TLDR5400 pinout, TLDR5400 application, or TLDR5400 equivalent, key selection factors include its deep red spectral output (648 nm typ.), wide-angle radiation (±30°), low VF (1.8–2.2 V), luminous intensity binning (Tb/U/V groups), and suitability for DC or pulsed drive up to 50 mA.

Technical Context

The TLDR5400 employs GaAlAs-on-GaAs double heterojunction (DH) technology to achieve high radiative efficiency and deep red emission. Its optical performance is characterized by a dominant wavelength of 648 nm and peak wavelength of 650 nm, with spectral line half-width of 20 nm - enabling precise color consistency in indicator applications.

Thermally, it features a junction-to-ambient thermal resistance of 350 K/W and supports operation from –40 °C to +100 °C ambient temperature. Absolute maximum ratings include 50 mA DC forward current, 6 V reverse voltage, and 100 mW power dissipation - defining safe operating boundaries for continuous and pulsed use.

Key Specifications

Pinout & Package

TLDR5400 is a two-terminal through-hole LED in a standard 5 mm T-1¾ package with axial leads. Cathode is identified by flat side on lens and shorter lead per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLDR5400, TLHR5400 offers higher brightness and shifted chromaticity for improved color differentiation, while APL503SURK provides greater raw output at the cost of tighter VF tolerance and no standardized intensity grading - making TLDR5400 optimal for designs requiring consistent low-current visibility and calibrated red hue.

Availability

TLDR5400 is available at Aetrix Electronics and suitable for telecom indicators, battery-powered devices, and industrial control panels requiring stable component supply, long-term luminance consistency, and RoHS-compliant through-hole LED sourcing.

Supply support for TLDR5400 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.

The TLDR5400 belongs to Vishay's standard 5 mm LED product line, engineered for high-visibility status indication in industrial, telecom, and portable equipment where color accuracy, wide viewing angle, and low-power operation are critical.

FAQ

What is the dominant wavelength of TLDR5400 and why does it matter for indicator design?

The TLDR5400 has a dominant wavelength of 648 nm (typ.) at 20 mA, placing it in the deep red portion of the visible spectrum. This wavelength delivers high photopic luminance and strong contrast against common PCB colors and industrial enclosures. For indicator design, this ensures maximum human eye sensitivity and legibility under varied ambient lighting - especially important in telecom and control panel applications where quick status recognition is essential. The TLDR5400's 648 nm output is distinct from orange-red (625 nm) or near-infrared LEDs, supporting unambiguous color coding in multi-LED interfaces.

Can TLDR5400 be driven with pulsed current, and what are the safe limits?

Yes, TLDR5400 supports pulsed operation with peak forward current up to 1 A for pulse widths ≤10 μs and duty cycle ≤0.01. At longer pulses (e.g., 25 ms), luminous intensity is measured with ±11% accuracy, and average current must remain within 50 mA DC limit. Pulse driving allows higher instantaneous brightness without exceeding thermal limits - useful in multiplexed displays. However, reverse voltage must not exceed 6 V during off-cycles, and thermal management remains critical when operating near surge ratings. The TLDR5400's GaAlAs-on-GaAs structure enables stable pulsed performance without degradation.

What does "tinted diffused" mean for the TLDR5400 package, and how does it affect light output?

"Tinted diffused" describes the TLDR5400's 5 mm epoxy lens: tinted to absorb ambient white light and enhance red color saturation, and diffused to scatter light uniformly across ±30°. This prevents hotspot formation and ensures consistent brightness across viewing angles - critical for front-panel indicators viewed from multiple positions. Unlike clear or water-clear LEDs, the tint reduces washout in bright environments, while diffusion eliminates the need for external lenses or masks. The TLDR5400's optical design delivers usable luminance at low drive currents without compromising beam uniformity or mechanical robustness.

How is luminous intensity binned for TLDR5400, and can I order a specific bin?

TLDR5400 is categorized into luminous intensity bins (e.g., Tb = 35–50 mcd, U = 40–80 mcd, V = 63–125 mcd) based on measurement at 20 mA. Each bag contains only one bin - no mixing - ensuring batch consistency. However, single-bin orders are not supported; Vishay ships standard distribution groups to guarantee availability. If your design requires tight intensity matching, specify the preferred bin (e.g., "U group") at order entry, and Aetrix will allocate from available stock. The TLDR5400's binning enables predictable brightness scaling across production runs without post-assembly sorting.

What is the thermal resistance and maximum junction temperature of TLDR5400, and how does that impact PCB layout?

The TLDR5400 has a junction-to-ambient thermal resistance of 350 K/W and a maximum junction temperature of 100 °C. Since it dissipates up to 100 mW (at 20 mA × 2.2 V), self-heating is modest - but board layout still matters. Use standard 1.5 oz copper pads with ≥2 mm² thermal relief for each lead, avoid enclosing the LED under conformal coating, and maintain ≥1.5 mm clearance from heat sources. In high-density layouts, spacing between TLDR5400 units should exceed 5 mm to prevent mutual heating. These practices ensure the TLDR5400 operates reliably across its full –40 °C to +100 °C ambient range without luminous decay.