Vishay Semiconductor Opto Division TLDR6400

Overview

TLDR6400 from Vishay Semiconductors is a high-intensity deep red LED using GaAlAs-on-GaAs double heterojunction technology, housed in a 5 mm tinted diffused T-1¾ package with ±30° viewing angle, 648 nm dominant wavelength, and 70 mcd typical luminous intensity at 20 mA - optimized for indicator and display applications under bright ambient lighting.

For engineers reviewing the TLDR6400 datasheet, TLDR6400 pinout, TLDR6400 application, or TLDR6400 equivalent, key selection criteria include forward voltage (1.8–2.2 V), reverse voltage rating (6 V), thermal resistance (350 K/W), luminous intensity binning (Tb–BB groups), and compatibility with DC or pulsed drive up to 50 mA continuous current.

Technical Context

The TLDR6400 employs a GaAlAs-on-GaAs double heterojunction structure enabling high radiative efficiency and stable deep red emission at 648 nm (dominant) and 650 nm (peak), with narrow spectral width (20 nm FWHM). Its wide ±30° half-intensity angle supports uniform illumination without secondary optics.

Designed for operation from –40 °C to +100 °C ambient, it delivers 3 mcd luminous intensity even at 1 mA drive, and maintains output across pulse widths from 0.02 ms to 100 ms with duty cycle-dependent derating per Fig. 7 - supporting both low-power battery operation and high-brightness pulsed signaling.

Key Specifications

Pinout & Package

TLDR6400 uses a standard 2-pin through-hole 5 mm (T-1¾) tinted diffused package with axial leads. Cathode is identified by flat side and shorter lead per Vishay mechanical drawing 95 10917.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLDR6400, TLHR6400 offers higher intensity but reduced ambient-light readability due to its clear lens, while SML-010PTT86R enables miniaturization and automation at the cost of through-hole serviceability and thermal robustness in high-temperature enclosures.

Availability

TLDR6400 is available at Aetrix Electronics and suitable for telecom indicators, battery-powered portable devices, and industrial HMI panels requiring stable component supply, consistent luminous intensity binning, and long-term availability in ammopack (TLDR6400-CSZ) and bulk formats.

Supply support for TLDR6400 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 passive elements, with leadership in optoelectronics, power MOSFETs, and precision resistors.

The TLDR6400 belongs to Vishay's standard 5 mm LED product series designed for high-reliability visual indication in industrial, telecom, and consumer equipment where consistent color, wide viewing angle, and extended temperature operation are essential.

FAQ

What is the maximum continuous forward current rating for TLDR6400?

The TLDR6400 has a maximum DC forward current rating of 50 mA at Tamb = 25 °C. Derating is required above 25 °C ambient per Fig. 1 in the datasheet - for example, at 85 °C ambient, the absolute maximum allowable DC current drops to approximately 30 mA to maintain junction temperature ≤100 °C. Always verify thermal design margins when operating TLDR6400 near its limits.

Does TLDR6400 support pulsed operation, and what are the limits?

Yes, TLDR6400 supports pulsed operation with peak forward current up to 1 A for pulse widths ≤10 μs (IFSM). For longer pulses, Fig. 2 shows allowable current vs. pulse length - e.g., 100 mA is permissible at 1 ms with 1% duty cycle. Pulse operation enables higher instantaneous brightness without exceeding average power dissipation limits of 100 mW.

How is luminous intensity binned for TLDR6400, and can I order a specific bin?

TLDR6400 is categorized into luminous intensity bins (Tb, U, V, W, X, Y, Z, AA, BB) ranging from 35–480 mcd min/max. However, Vishay explicitly states single brightness groups are not orderable - each bag contains only one bin, but customers cannot specify Tb or V at time of order. TLDR6400 shipments are assigned based on production yield and availability, not customer-selected bins.

What is the reverse voltage rating of TLDR6400, and is reverse polarity driving allowed?

The TLDR6400 has a reverse voltage rating of 6 V. The datasheet notes that short-term reverse driving is suitable for certain applications - however, this is not recommended for continuous operation. Exceeding 6 V in reverse bias risks permanent junction damage. For bidirectional signaling, external protection (e.g., anti-parallel diode) is required; TLDR6400 itself is not rated for sustained reverse conduction.

Is TLDR6400 RoHS-compliant and halogen-free?

Yes, TLDR6400 complies with RoHS Directive 2011/65/EU and is halogen-free per Vishay's material categorization standard (document 99912). The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE, and all brominated flame retardants are excluded. Compliance is verified per JEDEC J-STD-709 and IEC 61249-2-21 standards.