LED56 Infrared Emitter 940nm Equivalent & Substitute Parts

Part Overview

The LED56 is an infrared (IR) emitter operating at 940nm wavelength, designed for applications requiring near-infrared light emission. Manufactured by onsemi, this component delivers 100mA forward current in a TO-46-2 lens top metal can package with a 16° viewing angle. The LED56 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

LED56

onsemiIn Stock: 952LED56 Datasheet

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QED234

onsemiIn Stock: 17738QED234 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LED56 is determined by the following critical parameters:

• Wavelength: Must be 940nm to maintain spectral compatibility with receiver circuits and optical filters
• Forward Current (If): Maximum rating of 100mA ensures safe operation within existing circuit designs
• Forward Voltage (Vf): Operating voltage must be compatible with power supply constraints
• Mounting Type: Through-hole configuration required for PCB integration
• Operating Temperature Range: Must support the thermal environment of the application

The QED234 qualifies as a substitute based on matching wavelength (940nm), forward current rating (100mA), and through-hole mounting. Differences in package form factor, viewing angle, and forward voltage represent trade-offs that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The QED234 serves as the primary substitute for the obsolete LED56 based on matched wavelength and forward current specifications. Selection of QED234 requires verification of the following application-specific factors:

• Package Compatibility: The QED234 radial 5mm package differs from the LED56 TO-46-2 form factor. PCB layout and mechanical mounting must accommodate the different package geometry.
• Viewing Angle Adjustment: The QED234 provides a 40° viewing angle compared to the LED56's 16° angle. Applications requiring narrow-beam emission may require optical redesign or alternative component selection.
• Temperature Range: The QED234 operating range (-40°C ~ 100°C) is narrower than the LED56 (-65°C ~ 125°C). Verify that the application environment falls within QED234 specifications.
• Forward Voltage: The QED234 operates at 1.6V (Max) versus the LED56's 1.7V (Typ). Circuit designs with tight voltage regulation may require adjustment.
• Product Status: QED234 is actively manufactured by onsemi, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can QED234 directly replace LED56 without circuit modification?

A: Direct replacement requires verification of package compatibility and viewing angle requirements. The different form factors (TO-46-2 versus radial 5mm) necessitate PCB layout changes. The wider 40° viewing angle of QED234 may alter optical performance in applications designed for the LED56's 16° beam.

Q: What are the critical parameters for 940nm IR emitter substitution?

A: Wavelength (940nm), forward current rating (100mA), and mounting type (through-hole) are the primary substitution criteria. Forward voltage, viewing angle, and operating temperature range must be evaluated against specific application requirements.

Q: Is QED234 suitable for high-temperature applications?

A: The QED234 operating range extends to 100°C (TA). Applications requiring operation above 100°C or below -40°C require alternative component selection, as the LED56 supported -65°C ~ 125°C.

Q: How does the 40° viewing angle of QED234 compare to the LED56's 16° angle?

A: The QED234 provides a wider beam angle, distributing light over a larger area. Applications requiring concentrated, narrow-beam emission may experience reduced intensity at the optical axis. Optical system redesign may be necessary.

Q: Are there compliance or certification differences between LED56 and QED234?

A: Both components are REACH Unaffected and classified as EAR99 for export control purposes. QED234 carries RoHS3 compliance certification. Verify compliance requirements for your specific application and regulatory jurisdiction.