HSDL-4420#021 Equivalent & Substitute Parts

Part Overview

The HSDL-4420#021 is an infrared (IR) emitter manufactured by Lite-On Inc., designed for applications requiring 875nm wavelength emission. This component operates at 1.5V forward voltage with a maximum DC forward current of 100mA and delivers 9mW/sr radiant intensity at 50mA. The device features a 24° viewing angle and is housed in a 2-SMD, Yoke Bend surface mount package.

The HSDL-4420#021 is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, redesigns, or when inventory depletion occurs. Substitute parts must maintain functional compatibility within the application's optical and electrical requirements.

Substiute Parts

HSDL-4420#021

Lite-On Inc.In Stock: 874HSDL-4420#021 Datasheet

Current PartRFQ

LTR-C950-DB

Lite-On Inc.In Stock: 1171LTR-C950-DB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the HSDL-4420#021 must be evaluated based on the following criteria derived from the provided specifications:

Primary Substitution Criteria:

• Wavelength compatibility (875nm nominal)
• Forward voltage operating range (1.5V typical)
• Maximum forward current rating (100mA)
• Radiant intensity output (9mW/sr @ 50mA minimum)
• Viewing angle (24°)
• Surface mount packaging capability
• Operating temperature range (-40°C to 85°C)
• RoHS3 compliance

Secondary Compatibility Factors:

• Package footprint and mechanical dimensions
• Mounting orientation (top view configuration)
• Environmental and regulatory certifications

The substitute part LTR-C950-DB is a photodiode component with a 940nm wavelength specification. This part operates in the near-infrared spectrum and is housed in a 1206 (3216 Metric) surface mount package. While both components are surface mount devices and RoHS3 compliant, the LTR-C950-DB represents a different component category (photodiode sensor versus IR emitter) and operates at a different wavelength (940nm versus 875nm).

Parameter Comparison

Engineering Selection Recommendations

HSDL-4420#021 Status: Obsolete component with 785 pieces currently in stock.

LTR-C950-DB Status: Active component with 1067 pieces currently in stock.

The LTR-C950-DB is an active product from the same manufacturer (Lite-On Inc.) and maintains RoHS3 compliance. However, this component is functionally distinct from the HSDL-4420#021. The HSDL-4420#021 is an infrared emitter designed to generate and transmit IR radiation at 875nm, while the LTR-C950-DB is a photodiode sensor designed to detect incident radiation at 940nm. These components serve opposite functions within an optical system.

Component selection must be based on the specific application requirements. If the application requires an infrared emitter at 875nm, alternative IR emitter components operating at the same wavelength and with compatible electrical and mechanical specifications should be prioritized. If the application requires a photodiode sensor, the LTR-C950-DB may be suitable depending on the 940nm wavelength acceptance and sensor performance requirements.

Frequently Asked Questions (FAQ)

Q: Can the LTR-C950-DB directly replace the HSDL-4420#021?

A: No. The HSDL-4420#021 is an infrared emitter, while the LTR-C950-DB is a photodiode sensor. These components have fundamentally different functions. The HSDL-4420#021 generates IR radiation; the LTR-C950-DB detects it. Direct substitution is not possible without redesigning the circuit and application logic.

Q: What is the wavelength difference between these components?

A: The HSDL-4420#021 operates at 875nm, while the LTR-C950-DB operates at 940nm. This 65nm difference places both components in the near-infrared spectrum but at different points. Wavelength compatibility depends on the application's optical filtering and detection requirements.

Q: Are both components RoHS3 compliant?

A: Yes. Both the HSDL-4420#021 and LTR-C950-DB are RoHS3 compliant, meeting current environmental and regulatory standards for electronic components.

Q: What are the package differences?

A: The HSDL-4420#021 uses a 2-SMD, Yoke Bend package configuration, while the LTR-C950-DB uses a 1206 (3216 Metric) package. These are different footprints and require different PCB layout designs.

Q: Why is the HSDL-4420#021 obsolete?

A: The HSDL-4420#021 is classified as obsolete by the manufacturer. Despite current inventory availability (785 pieces), new designs should not rely on this component for long-term production. Active alternatives should be identified for future applications.

Q: What parameters determine substitution eligibility?

A: For IR emitter substitutes, the critical parameters are wavelength (875nm), forward voltage (1.5V typical), maximum forward current (100mA), radiant intensity (9mW/sr @ 50mA), viewing angle (24°), operating temperature range (-40°C to 85°C), and surface mount package compatibility. All parameters must align with application requirements.

Q: Can I use the LTR-C950-DB in a transmit-receive IR system?

A: The LTR-C950-DB is a receiver (photodiode). If your system requires both transmission and reception, you need an IR emitter for transmission and a photodiode for reception. The LTR-C950-DB addresses only the reception function. A separate IR emitter component is required for transmission.