Panasonic LN64 Infrared Emitter 950nm - Equivalent & Substitute Parts

Part Overview

The Panasonic LN64 is an infrared (IR) emitter operating at 950nm wavelength, designed for applications requiring near-infrared light emission. This component features a forward current rating of 100mA, a typical forward voltage of 1.3V, and is housed in a T 1 3/4 through-hole package. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

LN64

Panasonic Electronic ComponentsIn Stock: 977LN64 Datasheet

Current PartRFQ

SIR-56ST3FF

Rohm SemiconductorIn Stock: 978SIR-56ST3FF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Panasonic LN64 is determined by the following critical parameters:

• Wavelength: Must be 950nm to maintain spectral compatibility with receiver circuits and optical filters
• Current Rating: Maximum forward current must be 100mA or greater to support the same drive capability
• Voltage Characteristics: Forward voltage (Vf) of 1.3V ensures compatibility with existing power supply designs
• Package Type: T 1 3/4 through-hole package maintains mechanical and electrical interface compatibility
• Mounting Type: Through-hole mounting preserves PCB assembly compatibility
• Operating Temperature Range: -25°C ~ 85°C ensures thermal envelope compatibility

The Rohm Semiconductor SIR-56ST3FF meets all critical substitution criteria. While the radiant intensity (5.6mW/sr @ 50mA) and viewing angle (30°) differ from the original part, these parameters do not prevent functional substitution when the application tolerates the specified optical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The Rohm Semiconductor SIR-56ST3FF is a direct substitute for the Panasonic LN64 based on matching electrical and mechanical specifications. Both components share identical wavelength (950nm), forward current rating (100mA), forward voltage (1.3V), package type (T 1 3/4), and operating temperature range (-25°C ~ 85°C).

The SIR-56ST3FF exhibits higher radiant intensity (5.6mW/sr vs. 4.6mW/sr @ 50mA) and a narrower viewing angle (30° vs. 90°), which may affect optical system performance depending on application requirements. Both components carry MSL 1 (Unlimited) moisture sensitivity classification and are ECCN EAR99 controlled items.

Selection between these parts should be based on specific application requirements regarding optical intensity and beam divergence characteristics.

Frequently Asked Questions (FAQ)

Q: Can the Rohm SIR-56ST3FF replace the Panasonic LN64 in existing designs?

A: Yes, the SIR-56ST3FF is mechanically and electrically compatible. Both components use the T 1 3/4 through-hole package, operate at 950nm wavelength, and share identical forward current (100mA) and voltage (1.3V) specifications. PCB layout and circuit connections require no modification.

Q: What are the key differences between these two parts?

A: The primary differences are radiant intensity and viewing angle. The SIR-56ST3FF produces 5.6mW/sr @ 50mA compared to the LN64's 4.6mW/sr @ 50mA, and has a 30° viewing angle versus the LN64's 90° angle. These optical characteristics may impact system performance in applications sensitive to beam intensity or divergence.

Q: Are both parts still available for procurement?

A: Both the Panasonic LN64 and Rohm SIR-56ST3FF are classified as obsolete products. Availability is limited to existing inventory channels.

Q: Do these components require different PCB footprints?

A: No. Both components use the T 1 3/4 through-hole package with identical mechanical dimensions and pin configuration, allowing direct PCB footprint compatibility.

Q: What is the moisture sensitivity classification for these parts?

A: Both components carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions during storage or handling.