BL-B2134 Equivalent & Substitute Parts

Part Overview

The BL-B2134 is an active green diffused LED in T-1 3/4 (5mm) through-hole package manufactured by American Bright Optoelectronics Corporation. This component is designed for LED indication applications with a dominant wavelength of 567nm and forward voltage of 2.2V at 20mA test current. Finding equivalent substitute parts may be necessary due to inventory availability, supply chain considerations, or specific application requirements while maintaining functional compatibility.

Substiute Parts

BL-B2134

American Bright Optoelectronics CorporationIn Stock: 1004BL-B2134 Datasheet

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LTL2R3KG

Lite-On Inc.In Stock: 10149LTL2R3KG Datasheet

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LTL2R3KGD-EM

Lite-On Inc.In Stock: 4157LTL2R3KGD-EM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BL-B2134 are qualified based on the following criteria:

Mechanical Compatibility:

• Identical mounting type (Through Hole)
• Identical package type (Radial, T-1 3/4)
• Lens size within 5mm specification
• Physical dimensions compatible with PCB footprints

Optical Compatibility:

• Color: Green
• Lens transparency: Diffused
• Wavelength range: Green spectrum (567-575nm dominant wavelength acceptable)

Electrical Compatibility:

• Forward voltage (Vf) within acceptable operating range for circuit design
• Current rating compatible with standard LED circuit configurations
• Test current specifications provided for each part

The substitute parts LTL2R3KG and LTL2R3KGD-EM from Lite-On Inc. meet the mechanical and optical requirements. Both maintain the T-1 3/4 through-hole radial package, green diffused lens configuration, and green spectrum wavelength characteristics necessary for direct substitution in LED indication circuits.

Parameter Comparison

Engineering Selection Recommendations

LTL2R3KG Substitution: This part maintains active product status and provides ROHS3 compliance with REACH documentation. The forward voltage of 2.1V is within 0.1V of the BL-B2134, making it suitable for circuits designed for the original part. The 20mA test current matches the BL-B2134 specification. The higher millicandela rating (180mcd vs 40mcd) indicates increased brightness; circuit design must account for this difference in LED intensity. The slightly wider viewing angle (40° vs 35°) and marginally different dominant wavelength (572nm vs 567nm) remain within acceptable green spectrum parameters for indication applications.

LTL2R3KGD-EM Substitution: This part is active and ROHS3 compliant with REACH documentation. The lower forward voltage (1.8V) and significantly reduced test current (2mA vs 20mA) indicate this part operates at lower power levels. The millicandela rating (38mcd) closely matches the BL-B2134 (40mcd), providing similar brightness output. The narrower viewing angle (30° vs 35°) and lower test current require circuit redesign to accommodate different operating parameters. This substitution is appropriate for low-power indication applications where reduced current consumption is beneficial.

Frequently Asked Questions (FAQ)

Q: Can LTL2R3KG be used as a direct drop-in replacement for BL-B2134?

A: LTL2R3KG maintains mechanical compatibility (T-1 3/4 through-hole radial package) and electrical compatibility (2.1V forward voltage, 20mA test current). The primary consideration is the higher brightness output (180mcd vs 40mcd). If the circuit is designed to tolerate increased LED intensity or if brightness adjustment is acceptable, direct substitution is feasible. The dominant wavelength difference (572nm vs 567nm) remains within green spectrum parameters.

Q: What are the key differences between LTL2R3KG and LTL2R3KGD-EM?

A: Both parts share the same T-1 3/4 radial package and green diffused lens configuration. LTL2R3KG operates at 2.1V with 20mA test current and 180mcd brightness. LTL2R3KGD-EM operates at 1.8V with 2mA test current and 38mcd brightness. The LTL2R3KGD-EM is designed for low-power applications, while LTL2R3KG provides higher brightness output. Selection depends on circuit power budget and brightness requirements.

Q: Are there compliance differences between the substitute parts and the original BL-B2134?

A: LTL2R3KG and LTL2R3KGD-EM both carry ROHS3 compliance and REACH documentation. The BL-B2134 compliance status is not specified in the provided data. If regulatory compliance is a requirement for your application, the Lite-On parts provide documented ROHS3 and REACH compliance.

Q: How do viewing angles affect substitution suitability?

A: The BL-B2134 has a 35° viewing angle. LTL2R3KG provides 40° (wider) and LTL2R3KGD-EM provides 30° (narrower). Viewing angle determines the cone of light distribution. Wider angles distribute light over a larger area with reduced intensity in any single direction. Narrower angles concentrate light in a tighter cone. Application requirements for light distribution must be evaluated when selecting between these parts.

Q: What is the impact of different millicandela ratings on circuit design?

A: Millicandela (mcd) rating indicates LED brightness. BL-B2134 is rated at 40mcd, LTL2R3KG at 180mcd, and LTL2R3KGD-EM at 38mcd. Higher brightness may require reduced series resistor values to limit current, or the circuit may need adjustment to prevent over-driving the LED. Lower brightness may require increased current or removal of current-limiting resistors. Circuit validation is necessary when substituting parts with significantly different brightness ratings.