QBED8340 Infrared Emitter 850nm Equivalent & Substitute Parts

Part Overview

The QBED8340 is an infrared (IR) emitter manufactured by QT Brightek (QTB) operating at 850nm wavelength with a maximum forward current of 100mA and typical forward voltage of 1.4V. This radial through-hole component delivers 30mW/sr radiant intensity at 50mA with a 40° viewing angle and operates across the temperature range of -25°C to 85°C. The part is Active status, RoHS3 compliant, and carries MSL Level 1 (Unlimited) moisture sensitivity rating.

Substitute parts are necessary when the primary QBED8340 experiences supply constraints, extended lead times, or when design requirements permit operation at alternative wavelengths (940nm or 890nm) or package configurations (T 1 3/4 form factor). Substitution must maintain compatibility with forward current ratings, voltage specifications, and thermal operating ranges.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Wavelength	850nm	nm	Primary optical specification; determines IR spectrum compatibility
Current - DC Forward (If) Max	100mA	mA	Critical for circuit design and power dissipation calculations
Voltage - Forward (Vf) Typical	1.4V	V	Determines series resistor values and power supply requirements
Radiant Intensity (Ie) Min @ If	30mW/sr @ 50mA	mW/sr	Optical output performance metric
Viewing Angle	40°	degrees	Beam divergence and application-specific optical requirements
Package / Case	Radial	—	Physical form factor; affects PCB layout and mounting
Operating Temperature	-25°C to 85°C	°C	Thermal operating envelope for system design
Mounting Type	Through Hole	—	Assembly method compatibility
RoHS Status	RoHS3 Compliant	—	Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitution logic for the QBED8340 is based on the following allowed parameters:

Group 1: Same Wavelength (850nm) - Direct Substitutes No direct 850nm substitutes are provided in the substitute parts list.

Group 2: Alternative Wavelength (940nm) - Functional Substitutes Parts IR333C/H0/L10, IR7373C, LTE-5208A, and LTE-5228A operate at 940nm wavelength. These substitutes maintain the 100mA maximum forward current specification and through-hole mounting type. However, they feature different forward voltages (1.2V vs. 1.4V), radiant intensity values, and viewing angles. The operating temperature range extends to -40°C (lower minimum) while maintaining 85°C maximum. Package configurations differ: IR333C/H0/L10 and IR7373C retain radial packages, while LTE-5208A and LTE-5228A use T 1 3/4 form factor.

Group 3: Alternative Wavelength (890nm) - Functional Substitutes Parts OP290A, OP291A, OP292A, and OP294 operate at 890nm wavelength. These substitutes feature higher maximum forward current ratings (150mA for OP290A, OP291A, OP292A; 100mA for OP294) and variable forward voltages (4V, 2V, 1.75V, and 1.5V respectively). All use T 1 3/4 package configuration and support extended operating temperature range to -40°C to 100°C. Radiant intensity specifications are not provided for these parts.

All substitute parts maintain RoHS3 compliance, MSL Level 1 rating, and through-hole mounting compatibility.

Parameter Comparison

Part Number	Manufacturer	Wavelength (nm)	If Max (mA)	Vf Typ (V)	Viewing Angle (°)	Package / Case	Operating Temp (°C)	RoHS Status
QBED8340	QT Brightek	850	100	1.4	40	Radial	-25 to 85	RoHS3
IR333C/H0/L10	Everlight Electronics	940	100	1.2	40	Radial	-40 to 85	RoHS3
IR7373C	Everlight Electronics	940	100	1.2	50	Radial	-40 to 85	RoHS3
LTE-5208A	Lite-On Inc.	940	100	1.2	40	T 1 3/4	-40 to 85	RoHS3
LTE-5228A	Lite-On Inc.	940	100	1.2	40	T 1 3/4	-40 to 85	RoHS3
OP290A	TT Electronics/Optek	890	150	4.0	50	T 1 3/4	-40 to 100	RoHS3
OP291A	TT Electronics/Optek	890	150	2.0	50	T 1 3/4	-40 to 100	RoHS3
OP292A	TT Electronics/Optek	890	150	1.75	50	T 1 3/4	-40 to 100	RoHS3
OP294	TT Electronics/Optek	890	100	1.5	50	T 1 3/4	-40 to 100	RoHS3

Engineering Selection Recommendations

For 850nm Wavelength Requirement (No Substitutes Available) If the application requires 850nm wavelength operation, the QBED8340 is the only option from the provided parts list. No equivalent 850nm IR emitters are available as substitutes.

For 940nm Wavelength Applications When 940nm wavelength is acceptable, IR333C/H0/L10 and IR7373C (Everlight Electronics, radial package) or LTE-5208A and LTE-5228A (Lite-On Inc., T 1 3/4 package) are suitable. All maintain 100mA maximum forward current and RoHS3 compliance. IR333C/H0/L10 matches the 40° viewing angle of QBED8340. IR7373C provides wider 50° viewing angle. Forward voltage is lower (1.2V vs. 1.4V), requiring circuit resistor recalculation. Operating temperature range extends to -40°C minimum, providing broader thermal coverage than QBED8340.

For 890nm Wavelength Applications When 890nm wavelength is acceptable, OP294 is the closest match to QBED8340, maintaining 100mA maximum forward current and 1.5V forward voltage. OP290A, OP291A, and OP292A support higher 150mA current ratings with variable forward voltages (4V, 2V, 1.75V). All Optek parts use T 1 3/4 package and support extended operating temperature to 100°C maximum. Forward voltage specifications differ significantly; circuit design must account for these variations.

Compliance Considerations All substitute parts maintain RoHS3 compliance, MSL Level 1 rating, and REACH Unaffected status, matching the regulatory profile of QBED8340. ECCN and HTSUS classifications are identical across all parts.

Frequently Asked Questions (FAQ)

Q: Can I substitute QBED8340 with a 940nm or 890nm IR emitter? A: Substitution is possible only if the application design permits operation at alternative wavelengths. The QBED8340 operates at 850nm; 940nm and 890nm substitutes will produce different spectral output. Verify that the receiving photodiode or sensor is sensitive to the alternative wavelength before substitution.

Q: What is the impact of different forward voltages on circuit design? A: Forward voltage differences directly affect series resistor calculations and power supply requirements. QBED8340 operates at 1.4V typical; 940nm substitutes operate at 1.2V (0.2V lower), while 890nm substitutes range from 1.5V to 4V. Recalculate series resistor values using Ohm's law: R = (Vsupply - Vf) / If to maintain proper current limiting.

Q: Are radial and T 1 3/4 packages interchangeable? A: No. Radial packages (QBED8340, IR333C/H0/L10, IR7373C) have leads extending from the component body. T 1 3/4 packages (LTE-5208A, LTE-5228A, OP290A, OP291A, OP292A, OP294) have leads extending from the base. PCB footprints differ; verify layout compatibility before substitution.

Q: What is the difference between 40° and 50° viewing angles? A: Viewing angle defines the beam divergence of the IR emitter. 40° provides a narrower, more focused beam; 50° provides wider beam spread. Application requirements determine which is suitable. QBED8340 and IR333C/H0/L10 both feature 40° angles; IR7373C, LTE-5208A, LTE-5228A, and all Optek parts feature 50° angles.

Q: Can I use OP290A, OP291A, or OP292A as direct substitutes? A: These parts feature 150mA maximum forward current, exceeding QBED8340's 100mA rating. They are suitable only if the circuit design accommodates higher current operation. OP294 is more appropriate for direct current-level substitution, supporting 100mA maximum like QBED8340.

Q: Do all substitutes support the same operating temperature range as QBED8340? A: No. QBED8340 operates from -25°C to 85°C. All 940nm and 890nm substitutes extend the minimum temperature to -40°C. Optek parts (890nm) extend the maximum temperature to 100°C. Verify that the application thermal envelope is compatible with the substitute part's operating range.

Q: Are there any radiant intensity specifications for the Optek 890nm parts? A: No. Radiant intensity data is not provided for OP290A, OP291A, OP292A, or OP294. If optical output intensity is a critical design parameter, these parts cannot be directly compared to QBED8340 (30mW/sr @ 50mA) or the Everlight/Lite-On 940nm substitutes without additional manufacturer documentation.

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