TSFF5410 Infrared Emitter 870nm Equivalent & Substitute Parts

Part Overview

The TSFF5410 is an infrared (IR) emitter manufactured by Vishay Semiconductor Opto Division, designed for applications requiring 870nm wavelength emission at 100mA forward current. This component features a radial 5mm diameter (T 1 3/4) through-hole package with a 44° viewing angle and operates across an extended temperature range of -40°C to 85°C.

The TSFF5410 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

TSFF5410

Vishay Semiconductor Opto DivisionIn Stock: 24789TSFF5410 Datasheet

Current PartRFQ

HSDL-4220

Lite-On Inc.In Stock: 2750HSDL-4220 Datasheet

MFR RecommendedRFQ

HSDL-4251

Lite-On Inc.In Stock: 8450HSDL-4251 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TSFF5410 is determined by the following critical parameters:

• Wavelength: 870nm (primary functional requirement)
• Maximum Forward Current: 100mA (electrical compatibility)
• Forward Voltage: 1.5V nominal (circuit design compatibility)
• Package Type: T 1 3/4 radial through-hole (mechanical and board-level compatibility)
• Operating Temperature Range: -40°C to 85°C (environmental suitability)
• Mounting Type: Through Hole (assembly process compatibility)

The substitute parts identified below meet these core electrical and mechanical parameters, enabling direct or near-direct replacement in applications designed for the TSFF5410.

Parameter Comparison

Engineering Selection Recommendations

HSDL-4251 (Lite-On Inc.) is the primary substitute for the TSFF5410. This part maintains exact wavelength matching at 870nm, identical maximum forward current of 100mA, and matching operating temperature range of -40°C to 85°C. The HSDL-4251 is currently in active production status, ensuring supply chain availability. Both parts are ROHS3 compliant and REACH unaffected. The HSDL-4251 exhibits higher radiant intensity (56mW/sr @ 100mA versus 45mW/sr @ 100mA), providing improved optical output performance. The forward voltage is marginally lower at 1.4V versus 1.5V, which is within typical circuit tolerance. The viewing angle is narrower at 30° compared to 44°, which may affect optical coverage in applications requiring wider beam dispersion.

HSDL-4220 (Lite-On Inc.) is a secondary substitute option. This part shares the T 1 3/4 package, 100mA maximum forward current, and 1.5V forward voltage with the TSFF5410. However, the wavelength differs at 875nm (5nm offset from 870nm), and the operating temperature range is restricted to 0°C to 70°C, which does not cover the full -40°C to 85°C range of the original part. The radiant intensity specification is lower at 22mW/sr @ 50mA. The HSDL-4220 is suitable only for applications where the narrower temperature range and wavelength tolerance are acceptable.

Both substitute parts are ROHS3 compliant and carry REACH unaffected status, meeting regulatory requirements equivalent to the TSFF5410.

Frequently Asked Questions (FAQ)

Q: Can the HSDL-4251 be used as a direct replacement for the TSFF5410?

A: The HSDL-4251 meets the core electrical and mechanical parameters of the TSFF5410, including wavelength (870nm), maximum forward current (100mA), operating temperature range (-40°C to 85°C), and package type (T 1 3/4 through-hole). The primary design consideration is the narrower viewing angle (30° versus 44°), which may require optical system adjustment in applications sensitive to beam width.

Q: What is the wavelength difference between the HSDL-4220 and TSFF5410?

A: The HSDL-4220 operates at 875nm, a 5nm offset from the TSFF5410's 870nm specification. This difference may affect system performance in wavelength-sensitive applications such as optical filtering or sensor calibration. Additionally, the HSDL-4220 operating temperature range (0°C to 70°C) does not extend to the -40°C lower limit of the TSFF5410.

Q: Are both substitute parts RoHS and REACH compliant?

A: Yes. Both the HSDL-4251 and HSDL-4220 are ROHS3 compliant and REACH unaffected, matching the regulatory status of the TSFF5410.

Q: What is the significance of the radiant intensity difference between the TSFF5410 and HSDL-4251?

A: The HSDL-4251 provides 56mW/sr @ 100mA compared to the TSFF5410's 45mW/sr @ 100mA. This represents approximately 24% higher optical output at the same forward current, which may improve signal strength in optical detection circuits but does not prevent substitution in applications designed for the lower output level.

Q: Which substitute part is recommended for extended temperature applications?

A: The HSDL-4251 is the appropriate choice for applications requiring the full -40°C to 85°C operating range. The HSDL-4220 is limited to 0°C to 70°C and is unsuitable for extended temperature environments.

Q: Are there package compatibility concerns when substituting these parts?

A: All three parts use the T 1 3/4 radial through-hole package, ensuring mechanical and board-level compatibility. No package modification is required for substitution.