ASDL-4264-C31 Infrared Emitter 940nm Equivalent & Substitute Parts

Part Overview

The ASDL-4264-C31 is a radial infrared (IR) emitter operating at 940nm wavelength, manufactured by Lite-On Inc. This component is classified as obsolete, with 709 units currently in stock. The part delivers 6.02mW/sr radiant intensity at 20mA forward current with a 22° viewing angle and operates across the temperature range of -40°C to 85°C. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value
Wavelength	940nm
Forward Voltage (Vf Typ)	1.2V
Maximum Forward Current (If Max)	150mA
Radiant Intensity (Ie Min @ If)	6.02mW/sr @ 20mA
Viewing Angle	22°
Operating Temperature Range	-40°C to 85°C
Mounting Type	Through Hole
Package / Case	Radial
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ASDL-4264-C31 is determined by the following critical parameters: wavelength (940nm), forward voltage (1.2V typical), mounting type (through hole radial), viewing angle compatibility (20° to 22°), and operating temperature range (-40°C to 85°C). The maximum forward current rating and radiant intensity specifications define the performance envelope within which substitutes must operate.

Substitute parts are grouped into two categories:

Category A: Direct Wavelength Match (940nm) Parts maintaining the 940nm wavelength with compatible electrical and mechanical specifications. These include IR333-A, WP7113F3BT, XTNI12BF, and XTNI12W.

Category B: Alternative Wavelengths (850nm–880nm) Parts operating at different infrared wavelengths (860nm, 875nm, 880nm) with comparable forward voltage and current ratings. These include SIR333C, WP7113SF4C, WP7113SF6C, WP7113SF7C, and XTHI12BF, XTHI12W. These substitutes are suitable only when application spectral requirements permit wavelength variation.

Parameter Comparison

Part Number	Manufacturer	Wavelength (nm)	Vf Typ (V)	If Max (mA)	Ie Min @ If (mW/sr)	Viewing Angle (°)	Product Status	RoHS Status
ASDL-4264-C31	Lite-On Inc.	940	1.2	150	6.02 @ 20mA	22	Obsolete	Not specified
IR333-A	Everlight Electronics	940	1.2	100	7.8 @ 20mA	20	Active	ROHS3 Compliant
WP7113F3BT	Kingbright	940	1.2	50	Not specified	20	Active	ROHS3 Compliant
XTNI12BF	SunLED	940	1.2	50	25 @ 50mA	20	Active	ROHS3 Compliant
XTNI12W	SunLED	940	1.2	50	25 @ 50mA	20	Active	ROHS3 Compliant
SIR333C	Everlight Electronics	875	1.3, 1.4, 2.6	100	7.8 @ 100mA	20	Active	Not specified
WP7113SF4C	Kingbright	880	1.3	50	12 @ 50mA	20	Active	ROHS3 Compliant
WP7113SF6C	Kingbright	860	1.35	50	55 @ 50mA	20	Active	ROHS3 Compliant
WP7113SF7C	Kingbright	850	1.4	50	50 @ 50mA	20	Active	ROHS3 Compliant
XTHI12BF	SunLED	880	1.3	50	12 @ 50mA	20	Active	ROHS3 Compliant
XTHI12W	SunLED	880	1.3	50	12 @ 50mA	20	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (940nm Wavelength Match)

IR333-A, WP7113F3BT, XTNI12BF, and XTNI12W are direct wavelength equivalents to the ASDL-4264-C31. All four parts are active products with ROHS3 compliance and unlimited moisture sensitivity levels (MSL 1), ensuring long-term availability and regulatory compliance. IR333-A offers the highest inventory (424,000 units) and maintains the 1.2V forward voltage with 100mA maximum current. WP7113F3BT, XTNI12BF, and XTNI12W operate at reduced current ratings (50mA maximum) compared to the original 150mA specification; circuit designs must accommodate this lower current capability.

Alternative Wavelength Substitutes (850nm–880nm Range)

SIR333C, WP7113SF4C, WP7113SF6C, WP7113SF7C, XTHI12BF, and XTHI12W operate at wavelengths between 850nm and 880nm. These parts are suitable only for applications where the infrared spectrum is not critical to system function. All alternative wavelength parts are active products with ROHS3 compliance. WP7113SF6C and WP7113SF7C deliver significantly higher radiant intensity (50–55mW/sr @ 50mA) compared to the original part, making them suitable for applications requiring enhanced optical output within the near-infrared spectrum.

Compliance and Availability

All substitute parts carry ECCN EAR99 and HTSUS 8541.41.0000 classifications, matching the original component. Kingbright and SunLED parts demonstrate consistent ROHS3 compliance and MSL 1 ratings. Everlight Electronics parts (IR333-A and SIR333C) provide the largest inventory reserves, supporting high-volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 50mA-rated substitute in place of the 150mA ASDL-4264-C31?

A: Yes, if your circuit design operates the emitter at or below 50mA forward current. The lower current rating does not prevent substitution; it only restricts the maximum operating point. Verify that your application does not require the full 150mA capability before selecting a 50mA-rated part.

Q: Are 880nm and 860nm emitters compatible with 940nm applications?

A: Compatibility depends on the receiver photodiode or sensor spectral response. If the receiver is optimized for 940nm detection, substituting 880nm or 860nm emitters will reduce optical coupling efficiency. Consult the receiver component datasheet to confirm acceptable wavelength ranges before substitution.

Q: What is the difference between XTNI12BF and XTNI12W?

A: Both parts are SunLED 940nm emitters with identical electrical specifications (1.2V, 50mA, 25mW/sr @ 50mA, 20° viewing angle) and operating temperature range. The difference lies in packaging: XTNI12BF is supplied in bulk packaging, while XTNI12W is supplied in bulk as well. Verify packaging requirements with your procurement process.

Q: Why does IR333-A show higher radiant intensity (7.8mW/sr @ 20mA) than the original part (6.02mW/sr @ 20mA)?

A: Radiant intensity is measured at the same forward current (20mA) but represents the optical output per unit solid angle. IR333-A delivers superior optical efficiency at the same current level, making it a performance-equivalent or performance-enhanced substitute. This higher intensity is beneficial for applications requiring improved signal-to-noise ratio in receiver circuits.

Q: Is the 22° viewing angle of the original part critical for substitution?

A: The ASDL-4264-C31 specifies a 22° viewing angle, while most substitutes specify 20°. This 2° difference is negligible for most applications. If your optical design requires the exact 22° angle, confirm the substitute's viewing angle specification before final selection. The 20° angle provides a slightly narrower beam, which may improve directional coupling in some receiver configurations.

Q: What compliance certifications should I verify before substitution?

A: All listed substitutes carry ROHS3 compliance and REACH Unaffected status (where specified). Verify that your application requirements do not mandate additional certifications beyond these standards. Kingbright and SunLED parts consistently demonstrate ROHS3 compliance with MSL 1 ratings, supporting both commercial and industrial deployment.

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