IR333C Infrared Emitter 940nm 100mA Radial - Equivalent & Substitute Parts

Part Overview

The IR333C is an infrared (IR) emitter manufactured by Everlight Electronics Co Ltd, designed for applications requiring 940nm wavelength emission at 100mA forward current. This through-hole radial component operates across the temperature range of -40°C to 85°C and delivers 7.8mW/sr radiant intensity at 20mA with a 20° viewing angle. The part maintains Active product status and ROHS3 compliance. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Wavelength	940	nm
Current - DC Forward (If) Max	100	mA
Voltage - Forward (Vf) Typical	1.2	V
Radiant Intensity (Ie) Min @ If	7.8	mW/sr @ 20mA
Viewing Angle	20	°
Operating Temperature Range	-40 to 85	°C
Mounting Type	Through Hole	—
Package / Case	Radial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the IR333C is determined by the following critical parameters: wavelength (940nm), forward current rating (100mA maximum), forward voltage (1.2V typical), viewing angle (20°), mounting type (through-hole radial), and operating temperature range (-40°C to 85°C). Parts are grouped into two categories based on these constraints:

Category 1: Direct Wavelength Match (940nm) Parts maintaining 940nm wavelength with compatible current and voltage ratings qualify as primary substitutes. The QED234 (onsemi) and XTNI12W/XTNI12BF (SunLED) series meet the 940nm wavelength requirement. However, current rating differences must be evaluated: QED234 supports 100mA (matching IR333C), while XTNI12W and XTNI12BF are rated at 50mA maximum.

Category 2: Alternative Wavelength (880nm) Parts operating at 880nm wavelength (XTHI12W and XTHI12BF from SunLED) represent alternative IR emitters with reduced current ratings (50mA maximum). These are listed as substitutes but operate at a different wavelength within the infrared spectrum.

All substitute parts maintain ROHS3 compliance, through-hole radial mounting, and compatible operating temperature ranges or extended ranges.

Parameter Comparison

Part Number	Manufacturer	Wavelength (nm)	If Max (mA)	Vf Typ (V)	Ie Min @ If (mW/sr)	Viewing Angle (°)	Temp Range (°C)	Package	RoHS Status
IR333C	Everlight Electronics	940	100	1.2	7.8 @ 20mA	20	-40 to 85	Radial	ROHS3
QED234	onsemi	940	100	1.6 (Max)	27 @ 100mA	40	-40 to 100	Radial, 5mm	ROHS3
XTNI12W	SunLED	940	50	1.2	25 @ 50mA	20	-40 to 85	Radial	ROHS3
XTNI12BF	SunLED	940	50	1.2	25 @ 50mA	20	-40 to 85	Radial	ROHS3
XTHI12W	SunLED	880	50	1.3	12 @ 50mA	20	-40 to 85	Radial	ROHS3
XTHI12BF	SunLED	880	50	1.3	12 @ 50mA	20	-40 to 85	Radial	ROHS3

Engineering Selection Recommendations

QED234 (onsemi) is the primary substitute for IR333C applications requiring full 100mA current capacity at 940nm wavelength. This part maintains identical current rating and wavelength specification. The forward voltage maximum of 1.6V is higher than IR333C's 1.2V typical, and the viewing angle expands to 40° with extended operating temperature to 100°C. All parts maintain ROHS3 compliance and Active product status.

XTNI12W and XTNI12BF (SunLED) are suitable substitutes for applications where 50mA forward current is acceptable. Both parts match the 940nm wavelength and 1.2V forward voltage of IR333C, with identical 20° viewing angle and -40°C to 85°C operating range. These parts are functionally equivalent at reduced current levels.

XTHI12W and XTHI12BF (SunLED) operate at 880nm wavelength instead of 940nm and are limited to 50mA forward current. These parts are listed as substitutes but represent an alternative infrared wavelength. Selection depends on application tolerance for wavelength variation within the infrared spectrum.

All substitute parts carry ROHS3 compliance certification and maintain through-hole radial mounting compatibility with IR333C.

Frequently Asked Questions (FAQ)

Q: Can QED234 directly replace IR333C in all applications? A: QED234 matches the 100mA current rating and 940nm wavelength of IR333C. The higher forward voltage maximum (1.6V vs. 1.2V typical) and wider viewing angle (40° vs. 20°) must be evaluated against circuit design requirements. Both parts maintain ROHS3 compliance and compatible operating temperatures.

Q: What is the primary difference between XTNI12W/XTNI12BF and IR333C? A: XTNI12W and XTNI12BF are rated for 50mA maximum forward current, compared to IR333C's 100mA rating. Both maintain 940nm wavelength, 1.2V forward voltage, and 20° viewing angle. These parts are suitable for applications operating at reduced current levels.

Q: Why are XTHI12W and XTHI12BF listed as substitutes if they operate at 880nm? A: XTHI12W and XTHI12BF are included as alternative infrared emitters with compatible through-hole radial packaging and operating temperature range. The 880nm wavelength differs from IR333C's 940nm specification. Selection of these parts requires confirmation that the application tolerates wavelength variation within the infrared spectrum.

Q: Are all substitute parts ROHS3 compliant? A: All substitute parts listed (QED234, XTNI12W, XTNI12BF, XTHI12W, XTHI12BF) maintain ROHS3 compliance, matching IR333C's regulatory status.

Q: What packaging considerations apply to these substitutes? A: All parts utilize through-hole radial mounting. QED234 specifies 5mm diameter package dimension, while other parts use standard radial packaging. Physical board layout compatibility should be confirmed before selection.

Q: Can XTNI12W or XTNI12BF operate at IR333C's full 100mA rating? A: No. XTNI12W and XTNI12BF are rated for 50mA maximum forward current. Operating these parts above their rated current specification is not permitted.

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