Vishay Semiconductor Opto Division VLDY1235R

Overview

VLDY1235R from Vishay Semiconductors is a yellow dome lens surface-mount LED using AlInGaP-on-Si chip technology, delivering 9000–35500 mcd luminous intensity at 50 mA, with dominant wavelength 583–595 nm and ±11° viewing angle - deployed in illuminated signage, indicator panels, and LCD backlighting.

For engineers reviewing the VLDY1235R datasheet, VLDY1235R pinout, VLDY1235R application, or VLDY1235R equivalent, key selection criteria include forward voltage (1.9–2.7 V), ESD withstand (2 kV), reflow compatibility per J-STD-020, thermal resistance (325 K/W), and gullwing/reverse gullwing package variants for high-brightness indicator use.

Technical Context

This device is a monolithic AlInGaP-on-Si power LED optimized for high-luminance visible-light emission in compact SMD form. It operates at up to 70 mA DC forward current with 200 mW power dissipation and supports ambient temperatures from –40 °C to +100 °C.

The VLDY1235R uses a clear, untinted molded dome lens to achieve ±11° half-intensity beam angle and delivers consistent color binning (wavelength groups 583–595 nm) and intensity grading (luminous intensity groups FA–HA) per reel - no mixing of bins within a single tape.

Key Specifications

Pinout & Package

Package: SMD dome lens, 2.3 × 2.3 × 2.8 mm, available in gullwing (VLDY1235G) and reverse gullwing (VLDY1235R) configurations. The VLDY1235R variant uses reverse gullwing leads with cathode on left and anode on right when viewed from top with cathode marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VLDY1235R, VLDY1235G offers identical photometric performance in a mechanically distinct leadform, while VLDR1235R provides red chromaticity with matching thermal and drive characteristics - enabling rapid color variant development without board redesign.

Availability

VLDY1235R is available at Aetrix Electronics and suitable for traffic signals, industrial control panels, and illuminated advertising requiring stable component supply, consistent binning, and extended lifecycle support.

Supply support for VLDY1235R 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 designs and manufactures discrete semiconductors and optoelectronics with emphasis on reliability, precision, and application-specific performance.

The VLDY1235R belongs to Vishay's dome lens SMD LED product series, engineered for high-brightness visible indication in space-constrained, thermally demanding environments such as transportation and industrial interfaces.

FAQ

What is the maximum continuous forward current for VLDY1235R?

The absolute maximum DC forward current for VLDY1235R is 70 mA at ambient temperatures ≤60 °C. Operation above this value risks accelerated lumen depreciation and thermal runaway. Derating is required above 60 °C per Figure 1 in the datasheet - at 100 °C ambient, max IF drops to approximately 35 mA to maintain junction temperature ≤125 °C. Always verify thermal design with actual board layout and copper area.

Does VLDY1235R require baking before reflow soldering?

VLDY1235R is preconditioned per JEDEC Level 2a and shipped in dry-packed anti-humidity bags. Baking is not required if the sealed bag is opened and the reel is mounted within 672 hours under ≤30 °C / 60 % RH conditions. If exposed beyond that window or if the humidity indicator card reads >10 %, bake per Vishay's guidelines: 96 h at 60 °C +5 °C and <5 % RH. VLDY1235R itself does not change specification post-bake - it restores moisture-safe reflow capability.

What does the "R" suffix in VLDY1235R signify?

The "R" in VLDY1235R denotes the reverse gullwing leadform configuration - leads bend downward and outward from the bottom of the package body, with cathode on the left and anode on the right when viewed from the top with cathode marking. This contrasts with the "G" suffix (gullwing), where leads bend upward. Both share identical optical, electrical, and thermal specs - only mechanical mounting differs.

Can VLDY1235R be used in outdoor applications?

Yes - VLDY1235R is rated for operating temperatures from –40 °C to +100 °C and has a clear, untinted epoxy dome lens resistant to UV-induced yellowing. Its 2 kV HBM ESD rating and JEDEC Level 2a moisture classification support ruggedized outdoor enclosures. However, long-term outdoor use requires full system-level protection: conformal coating, thermal management to limit Tj, and IP-rated housing to prevent condensation ingress onto the LED surface.

How is luminous intensity binned for VLDY1235R?

VLDY1235R is binned into luminous intensity groups (FA–HA) per reel, with IV_max/IV_min ≤ 1.6 within each group. Each reel contains only one intensity group and one wavelength group (e.g., Group 5: 589–592 nm). Binning occurs at 50 mA, 25 °C, and is traceable via the SelCode on the bar code label. No mixing of intensity or wavelength bins occurs on a single reel - ensuring predictable brightness matching in array-based applications.