Equivalent & Substitute Parts for TLVD42Q1S2

Part Overview

The TLVD42Q1S2 is a red 3mm through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications with a dominant wavelength of 640nm and typical forward voltage of 1.8V at 15mA test current. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. Active alternatives with compatible electrical and mechanical characteristics are available from both Vishay and other manufacturers.

Substiute Parts

TLVD42Q1S2

Vishay Semiconductor Opto DivisionIn Stock: 1032TLVD42Q1S2 Datasheet

Current PartRFQ

TLVD4200

Vishay Semiconductor Opto DivisionIn Stock: 5898TLVD4200 Datasheet

Parametric EquivalentRFQ

HLMP-1321

Broadcom LimitedIn Stock: 2471HLMP-1321 Datasheet

MFR RecommendedRFQ

HLMP-1321-G0002

Broadcom LimitedIn Stock: 6071HLMP-1321-G0002 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TLVD42Q1S2 is determined by the following critical parameters: color (red), lens size (3mm T-1), mounting type (through hole radial), lens transparency (clear), and wavelength range (dominant wavelength in the 626–650nm band). The forward voltage tolerance range of 1.8–1.9V and test current specifications of 10–15mA are acceptable for functional equivalence in indication applications. Millicandela rating and viewing angle variations are acceptable provided the application does not require the exact 80mcd brightness or 170° viewing angle of the original part.

The substitute parts are grouped as follows:

Parametric Equivalent (Same Manufacturer, Active Status): TLVD4200 maintains identical electrical and optical specifications with the same manufacturer, offering direct replacement capability with improved availability.

Manufacturer-Recommended Alternatives (Cross-Manufacturer): HLMP-1321 and HLMP-1321-G0002 (Broadcom Limited) provide functional equivalence with minor parameter variations acceptable for indication circuits, including different lens style (domed top), slightly higher forward voltage (1.9V), and reduced brightness (30mcd).

Parameter Comparison

Engineering Selection Recommendations

First Choice: TLVD4200 — This Vishay part is the direct parametric equivalent with identical electrical and optical specifications. It maintains active product status, ensuring long-term availability and supply chain stability. Selection of TLVD4200 eliminates any performance variation and is recommended for designs where the original 80mcd brightness and 170° viewing angle are functional requirements.

Alternative Choice: HLMP-1321 or HLMP-1321-G0002 — These Broadcom parts are suitable for applications where reduced brightness (30mcd) and narrower viewing angle (45°) are acceptable. The 0.1V increase in forward voltage (1.9V vs. 1.8V) requires circuit verification to confirm adequate current limiting and voltage headroom. HLMP-1321-G0002 in Cut Tape packaging offers higher inventory availability (6053 pcs) compared to HLMP-1321 in Bulk packaging (2400 pcs). Both parts maintain ROHS3 compliance and MSL-1 rating, meeting environmental and reliability standards equivalent to the original part.

All substitute parts are through-hole radial mount components compatible with standard PCB footprints designed for 3mm T-1 LEDs.

Frequently Asked Questions (FAQ)

Q: Can TLVD4200 be used as a direct replacement for TLVD42Q1S2?

A: Yes. TLVD4200 is a parametric equivalent with identical color, lens size, wavelength, forward voltage, test current, brightness, and viewing angle specifications. The primary difference is product status (active vs. obsolete) and packaging format. No circuit modifications are required.

Q: What are the key differences between TLVD4200 and HLMP-1321?

A: TLVD4200 and HLMP-1321 differ in dominant wavelength (640nm vs. 626nm), forward voltage (1.8V vs. 1.9V), test current (15mA vs. 10mA), brightness (80mcd vs. 30mcd), viewing angle (170° vs. 45°), and lens style (flat top vs. domed top). HLMP-1321 is suitable only for applications where reduced brightness and narrower viewing angle are acceptable.

Q: Are the Broadcom HLMP-1321 parts compatible with the original circuit design?

A: Functional compatibility depends on circuit design. The 0.1V higher forward voltage and 50mcd lower brightness require verification that the current-limiting resistor and power supply provide adequate margin. The narrower 45° viewing angle may affect visibility in applications requiring wide-angle indication. Electrical simulation or prototype testing is necessary to confirm suitability.

Q: What is the difference between HLMP-1321 and HLMP-1321-G0002?

A: Both parts are electrically and optically identical. The difference is packaging: HLMP-1321 is supplied in Bulk format, while HLMP-1321-G0002 is supplied in Cut Tape (CT) format. HLMP-1321-G0002 offers higher current inventory (6053 pcs vs. 2400 pcs) and is suitable for automated assembly processes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. TLVD4200, HLMP-1321, and HLMP-1321-G0002 are all ROHS3 compliant with MSL-1 (unlimited) moisture sensitivity rating, matching the environmental and reliability standards of the original TLVD42Q1S2.

Q: Which substitute part should be selected for new designs?

A: TLVD4200 is recommended for new designs requiring exact performance match to the original specification. HLMP-1321-G0002 is recommended if supply chain diversity or automated assembly compatibility is a design priority, provided the application tolerates the specified parameter variations.