Vishay Semiconductor Opto Division VLDS1235R

Overview

VLDS1235R from Vishay Semiconductors is a super red dome lens SMD LED using AlInGaP-on-Si chip technology, delivering 5600–22400 mcd luminous intensity at 50 mA, with dominant wavelength 626–637 nm and ±11° viewing angle. It operates up to 70 mA DC forward current and is rated for -40 °C to +100 °C ambient temperature, suited for high-visibility traffic signal indicators.

For engineers reviewing the VLDS1235R datasheet, VLDS1235R pinout, VLDS1235R application, or VLDS1235R equivalent, this page provides verified optical-electrical specs, gullwing/reverse gullwing package details, thermal resistance (325 K/W), ESD rating (2 kV), and reflow-compatible construction per J-STD-020.

Technical Context

The VLDS1235R is a surface-mount, untinted clear-package LED optimized for directional visibility with a narrow ±11° half-intensity beam. Its AlInGaP-on-Si die enables high luminous flux and stable color performance across temperature ranges.

It supports pulsed and DC operation up to 70 mA at ≤60 °C ambient, with thermal resistance junction-to-ambient of 325 K/W on PCBs with >16 mm² pad area. Reverse voltage tolerance is limited to 5 V for short-term use only.

Key Specifications

Pinout & Package

VLDS1235R is available in reverse gullwing SMD package (2.3 × 2.3 × 2.8 mm) with exposed copper thermal pad. Cathode and anode terminals are positioned for standard pick-and-place placement and reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VLDS1235G, VLDS1235R offers identical photometric performance but demands reversed PCB layout; compared with VLDS1235R-08, it provides higher reel quantity and standard tape pitch, optimizing for high-volume automated assembly throughput.

Availability

VLDS1235R is available at Aetrix Electronics and suitable for traffic signaling, industrial control panels, automotive interior lighting, and public information displays requiring stable component supply and consistent luminous intensity binning.

Supply support for VLDS1235R 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 leader in discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power management, and sensing solutions.

The VLD.1235 series was developed for demanding visual indication applications requiring high brightness, tight chromaticity control, and robust SMD manufacturability in automotive, industrial, and transportation markets.

FAQ

What is the maximum continuous forward current for VLDS1235R?

The VLDS1235R supports a maximum DC forward current of 70 mA when ambient temperature is maintained at or below 60 °C. Exceeding this current or operating above the temperature limit risks accelerated lumen depreciation and reduced lifetime. Derating is required per the datasheet's IF vs. Tamb curve (Fig. 1), and thermal management via adequate PCB copper area (>16 mm²) is essential to maintain junction temperature ≤125 °C.

Does VLDS1235R have a built-in current-limiting resistor?

No, VLDS1235R is a bare LED die in a molded SMD package and does not include an integrated current-limiting resistor. External series resistance or constant-current driver circuitry must be used to regulate forward current to 50 mA (typical test condition) or up to 70 mA (absolute max). The forward voltage range of 1.9–2.7 V at 50 mA must be accounted for in driver design to ensure stable biasing.

Can VLDS1235R be used in reflow soldering processes?

Yes, VLDS1235R is qualified for lead-free reflow soldering per J-STD-020, with a peak temperature of 260 °C and maximum time above liquidus of 100 s. It has undergone preconditioning to JEDEC level 2a and includes dry-pack moisture sensitivity labeling. Post-opening storage in dry boxes (<10% RH) or baking (e.g., 96 h at 60 °C) is required if exposed to ambient conditions beyond 672 hours before reflow.

What is the meaning of "SUPER RED" in VLDS1235R's color designation?

"SUPER RED" refers to the specific chromaticity bin defined by dominant wavelength 626–637 nm and peak wavelength ~639 nm, distinguishing VLDS1235R from standard red (619–631 nm), orange-red (611–621 nm), and yellow (583–595 nm) variants in the VLD.1235 family. This bin meets international traffic signal standards for red conspicuity and is binned separately to ensure spectral consistency across production lots.

How is luminous intensity binned for VLDS1235R, and why does it matter?

VLDS1235R is binned by luminous intensity such that IVmax/IVmin ≤ 1.6 within each packing unit (reel), with standard groups ranging from DB (5600–7100 mcd) to GA (18000–22400 mcd). This tight binning ensures uniform brightness across multi-LED arrays-critical for traffic signals and control panels where inconsistent illumination would impair readability or violate regulatory homogeneity requirements.