LTE-3376 Infrared Emitter 850nm Equivalent & Substitute Parts

Part Overview

The LTE-3376 is an infrared (IR) emitter manufactured by Lite-On Inc., designed for applications requiring 850nm wavelength emission at 80mA forward current. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts become necessary when addressing specific application constraints such as package form factor compatibility, operating temperature range requirements, or radiant intensity specifications that differ from the original design.

Substiute Parts

LTE-3376

Lite-On Inc.In Stock: 57299LTE-3376 Datasheet

Current PartRFQ

HSDL-4220

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

MFR RecommendedRFQ

HSDL-4261

Lite-On Inc.In Stock: 1202HSDL-4261 Datasheet

MFR RecommendedRFQ

SIR-568ST3F

Rohm SemiconductorIn Stock: 1442SIR-568ST3F Datasheet

MFR RecommendedRFQ

SIR-56ST3FF

Rohm SemiconductorIn Stock: 978SIR-56ST3FF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTE-3376 is determined by the following critical parameters:

Primary Substitution Criteria:

• Wavelength: 850nm (exact match required for optical system compatibility)
• Forward Voltage (Vf Typ): 1.6V (circuit bias compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Package Form Factor: Radial or T 1 3/4 (mechanical fit and lead configuration)
• RoHS3 Compliance: Required for regulatory alignment
• Operating Temperature Range: Must encompass or match application requirements

Secondary Compatibility Factors:

• Forward Current (If Max): Tolerance range 80mA to 100mA acceptable for most applications
• Radiant Intensity (Ie Min @ If): Variation acceptable based on application sensitivity requirements
• Viewing Angle: 26° to 30° range acceptable for most optical designs

Parts meeting these criteria are classified as direct substitutes. Parts with wavelength deviation or incompatible package types are listed for reference only.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (850nm Wavelength, Radial Package):

SIR-568ST3F is the only alternative with matching 850nm wavelength and 1.6V forward voltage. However, this part carries "Not For New Designs" status and uses T 1 3/4 package form factor, requiring mechanical redesign. Operating temperature range (-25°C ~ 85°C) is narrower than LTE-3376 at the low end.

Wavelength-Variant Alternatives (Radial Package):

HSDL-4261 maintains radial package compatibility with -40°C ~ 85°C operating range matching LTE-3376 low-temperature capability. Wavelength shifts to 870nm with 1.4V forward voltage, requiring optical system validation. Radiant intensity increases to 36mW/sr @ 20mA, providing higher output.

Package-Variant Alternatives (850nm Wavelength):

No T 1 3/4 package options exist with exact 850nm wavelength and 1.6V specifications. HSDL-4220 (875nm, 1.5V) and SIR-568ST3F (850nm, 1.6V) both require mechanical redesign for T 1 3/4 form factor.

Not Recommended:

HSDL-4220 deviates to 875nm wavelength and 1.5V forward voltage with reduced operating temperature range (0°C ~ 70°C). SIR-56ST3FF operates at 950nm wavelength, incompatible with 850nm optical systems, and carries Obsolete status.

For new designs, LTE-3376 remains the preferred selection. For existing designs requiring substitution, HSDL-4261 offers the closest compatibility with radial package retention and extended temperature range.

Frequently Asked Questions (FAQ)

Q: Can HSDL-4220 replace LTE-3376 in my application?

A: HSDL-4220 is not a direct substitute. While both are Lite-On IR emitters with Through Hole mounting, HSDL-4220 operates at 875nm wavelength versus LTE-3376's 850nm, uses T 1 3/4 package instead of Radial, and has reduced operating temperature range (0°C ~ 70°C versus -40°C ~ 85°C). Substitution requires optical system validation and mechanical redesign.

Q: What is the key difference between LTE-3376 and HSDL-4261?

A: Both are Lite-On IR emitters in Radial package with Through Hole mounting and -40°C operating temperature capability. LTE-3376 operates at 850nm with 1.6V forward voltage and 30mW/sr radiant intensity. HSDL-4261 operates at 870nm with 1.4V forward voltage and higher 36mW/sr radiant intensity. Wavelength difference requires optical system validation.

Q: Why is SIR-568ST3F marked "Not For New Designs"?

A: SIR-568ST3F carries this status from Rohm Semiconductor, indicating the manufacturer recommends against using this part in new product development. While technically compatible with 850nm wavelength and 1.6V forward voltage, the T 1 3/4 package differs from LTE-3376's Radial form factor, and the narrower operating temperature range (-25°C ~ 85°C) may not suit all applications.

Q: Can I use SIR-56ST3FF as a substitute?

A: No. SIR-56ST3FF operates at 950nm wavelength, fundamentally incompatible with 850nm optical systems. Additionally, this part carries Obsolete status and should not be selected for any new or replacement applications.

Q: What package types are available for 850nm IR emitters?

A: Among the listed substitutes, 850nm wavelength is available in Radial package (LTE-3376) and T 1 3/4 package (SIR-568ST3F). Package selection depends on PCB layout and mechanical constraints. Radial packages are preferred for new designs due to active product status and broader availability.

Q: How do I determine if a substitute part will work in my circuit?

A: Verify three critical parameters: (1) Wavelength must match your optical system requirements; (2) Forward voltage (Vf) must be compatible with your bias circuit; (3) Operating temperature range must encompass your application environment. Package form factor and mounting type must also align with your PCB design.