Vishay Semiconductor Opto Division TLLG4401

Overview

TLLG4401 from Vishay Semiconductors is a low-current green LED in a 3 mm tinted diffused package, delivering 1–2 mcd luminous intensity at 2 mA forward current, with dominant wavelength 562–575 nm and forward voltage 1.9–2.4 V. It serves as an indicator or status light in space-constrained, low-power DC circuits requiring visible green emission and ±25° viewing angle.

For engineers reviewing the TLLG4401 datasheet, TLLG4401 pinout, TLLG4401 application, or TLLG4401 equivalent, this device is selected for its standardized 3 mm through-hole package, GaP-on-GaP chip technology, luminous intensity binning (Group L), and compatibility with CMOS/MOS logic-level drive circuits.

Technical Context

The TLLG4401 uses a GaP-on-GaP semiconductor structure optimized for green emission, with peak wavelength at 565 nm and dominant wavelength tightly binned across 562–575 nm. Its optical output is characterized at 2 mA pulsed (25 ms), ensuring stable intensity categorization within Group L (1–2 mcd).

Thermal resistance junction-to-ambient is 800 K/W, supporting operation from –40 °C to +100 °C ambient, while absolute maximum ratings include 7 mA DC forward current, 6 V reverse voltage, and 20 mW power dissipation - all specified at Tamb = 25 °C unless noted.

Key Specifications

Pinout & Package

Package: 3 mm radial-leaded, tinted diffused epoxy lens, cathode indicated by flat side and shorter lead. Standard through-hole mounting with 2.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLLG4401, the AS12 and MS12 variants maintain identical photometric and electrical performance but differ in packaging logistics - AS12 supports cathode-first feeding, while MS12 uses wider tape for enhanced handling stability in automated placement.

Availability

TLLG4401 is available at Aetrix Electronics and suitable for industrial control panels, portable medical devices, automotive cabin interfaces, and consumer appliance indicators requiring stable component supply and consistent green luminous output.

Supply support for TLLG4401 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, diodes, and resistors for industrial, automotive, and computing markets.

The TLLG4401 belongs to Vishay's low-current LED product line, designed specifically for energy-efficient visual indication in space- and power-constrained applications where consistent color, intensity, and long-term stability are essential.

FAQ

What is the luminous intensity range of the TLLG4401 at its rated test current?

The TLLG4401 delivers 1–2 mcd luminous intensity at 2 mA forward current, per its Group L classification in the Vishay datasheet (Document Number: 83029, Rev. 2.6). This value is measured using a 25 ms current pulse and applies to the TLLG4401-MS21 variant specifically. The TLLG4401 is binned to ensure consistency across production lots, making it suitable for applications requiring uniform brightness.

Does the TLLG4401 support direct drive from a 3.3 V microcontroller GPIO?

Yes, the TLLG4401 supports direct drive from a 3.3 V microcontroller GPIO when used with an appropriate current-limiting resistor. With a forward voltage range of 1.9–2.4 V at 2 mA, a ~470 Ω resistor yields ~2 mA drive from 3.3 V, well within the device's absolute maximum rating of 7 mA. Its CMOS/MOS compatibility and low reverse leakage (<10 μA at 6 V) further confirm safe interface behavior.

What does the "MS21" suffix in TLLG4401-MS21 indicate?

"MS21" denotes the tape packaging configuration: "MS" specifies a 25.5 mm wide carrier tape, and "21" indicates anode-first feed direction (anode leads cathode during reel unwinding). This differs from AS12 (cathode-first, 17.3 mm tape) and is relevant for SMT placement equipment setup. The underlying TLLG4401 die, optical, and electrical specifications remain identical across all suffixes.

Is the TLLG4401 suitable for outdoor applications exposed to UV or moisture?

The TLLG4401 features a tinted diffused epoxy lens rated for operation from –40 to +100 °C, but it is not rated for outdoor UV exposure or moisture ingress. Its construction lacks IP-rated sealing or UV-stabilized encapsulation. For outdoor use, consider Vishay's automotive-grade or industrial-sealed LED families with explicit environmental qualification - the TLLG4401 is intended for indoor or protected enclosure applications only.

How does the TLLG4401's dominant wavelength compare to standard green LEDs?

The TLLG4401 has a dominant wavelength range of 562–575 nm, placing it in the medium-green spectrum - distinct from yellow-green (~570 nm) or pure green (~525 nm) emitters. This range aligns with IEC-defined green signaling bands and provides high photopic visibility while avoiding overlap with red or yellow indicators. Its GaP-on-GaP chip technology ensures stable wavelength output across temperature and aging.