Vishay Semiconductor Opto Division VLME31Q2T1-35-GS18

Overview

VLME31Q2T1-35-GS18 from Vishay Semiconductors is a yellow AlInGaP-on-GaAs surface-mount LED in PLCC-2 package, delivering 90–355 mcd luminous intensity at 20 mA, with dominant wavelength 581–594 nm, forward voltage 2.0–2.6 V, and ±60° viewing angle. It serves as a high-brightness indicator or backlighting element in automotive dashboards and office equipment.

For engineers reviewing the VLME31Q2T1-35-GS18 datasheet, VLME31Q2T1-35-GS18 pinout, VLME31Q2T1-35-GS18 application, or VLME31Q2T1-35-GS18 equivalent, key selection criteria include luminous intensity binning (Q2), AEC-Q101 qualification, JEDEC level 2a preconditioning, 2 kV ESD rating, and compatibility with IR reflow per J-STD-020.

Technical Context

This device uses AlInGaP-on-GaAs semiconductor technology to achieve high-efficiency yellow emission with narrow dominant wavelength range (581–594 nm) and stable spectral output. Its PLCC-2 package features a white thermoplastic body with clear epoxy lens and integrated reflector, enabling directional light control and mechanical robustness for automated placement.

Designed for DC operation at IF = 20 mA, the VLME31Q2T1-35-GS18 supports ambient temperatures from –40 °C to +100 °C and exhibits thermal resistance RthJA = 400 K/W when mounted on ≥16 mm² PCB pad. It meets CECC 00802 and J-STD-020 soldering standards and is rated for 30 mA continuous forward current.

Key Specifications

Pinout & Package

The VLME31Q2T1-35-GS18 is housed in a surface-mount PLCC-2 package with 2 terminals: anode and cathode. The package measures 3.5 mm × 2.8 mm × 1.75 mm (L × W × H), features a non-diffused lens for efficient light-pipe coupling, and uses a lead frame embedded in white thermoplastic with internal reflector and clear epoxy encapsulant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VLME31Q2T1-35-GS18, VLME31R1S2-GS08 offers higher median brightness but looser intensity grouping, while OSRAM LYT676-Q2T1 matches optical specs exactly but requires validation of thermal and soldering behavior in the target PCB stack-up.

Availability

VLME31Q2T1-35-GS18 is available at Aetrix Electronics and suitable for automotive dashboard backlighting, office equipment indicators, telecom device backlighting, and audio/video equipment status indication requiring stable component supply and MSL-compliant packaging.

Supply support for VLME31Q2T1-35-GS18 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.

The VLME31-series belongs to Vishay's standard SMD LED product line, engineered for high-brightness yellow emission in automotive, telecom, and consumer interface applications using AlInGaP-on-GaAs technology.

FAQ

What is the luminous intensity range of the VLME31Q2T1-35-GS18 at 20 mA?

The VLME31Q2T1-35-GS18 has a luminous intensity range of 90–355 mcd at 20 mA forward current, corresponding to its Q2/T1 binning classification. This range reflects factory-tested values under standardized pulse conditions (25 ms pulse width, ±11% measurement accuracy), and all units on a given reel fall within this specified ratio (IVmax/IVmin ≤ 1.6).

Is the VLME31Q2T1-35-GS18 qualified for automotive use?

Yes, the VLME31Q2T1-35-GS18 is AEC-Q101 qualified, confirming its suitability for automotive interior lighting applications such as dashboard backlighting and switch illumination. This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock, ensuring reliability under real-world vehicle operating conditions.

What is the maximum forward current rating for the VLME31Q2T1-35-GS18?

The VLME31Q2T1-35-GS18 has a maximum DC forward current rating of 30 mA at ambient temperatures ≤85 °C. At 20 mA - its nominal test condition - it delivers specified luminous intensity and forward voltage. Exceeding 30 mA risks accelerated degradation or thermal runaway due to its 400 K/W junction-to-ambient thermal resistance.

Does the VLME31Q2T1-35-GS18 require special handling for moisture sensitivity?

Yes, the VLME31Q2T1-35-GS18 is classified as MSL level 2a per JEDEC J-STD-020. Once the antistatic moisture barrier bag is opened, it must be mounted within 672 hours at ≤30 °C/60% RH or stored in a dry box (<10% RH). If exposed beyond this limit, baking per JESD22-A112 (e.g., 96 h at 60 °C/<5% RH) is required before reflow.

What soldering processes are compatible with the VLME31Q2T1-35-GS18?

The VLME31Q2T1-35-GS18 supports IR reflow, vapor-phase reflow, and wave soldering per CECC 00802 and J-STD-020 standards. Its recommended Pb-free reflow profile peaks at 245 °C (max 260 °C for ≤100 s), with ramp rates limited to 3 °C/s up and 6 °C/s down. Double-wave soldering is also validated, with first-wave preheat and second-wave peak at 235–260 °C.