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LED Yellow Diffused T-1 T/H 3YDL Equivalent & Substitute Parts
Part Overview
The Bivar Inc. 3YDL is a yellow diffused T-1 through-hole LED indicator with a 2V forward voltage and 2mcd brightness rating. This component is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for production and maintenance applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 3YDL |
| Manufacturer | Bivar Inc. |
| Color | Yellow |
| Lens Transparency | Diffused |
| Lens Size | 3mm, T-1 |
| Lens Style | Round with Domed Top |
| Voltage - Forward (Vf) (Typ) | 2V |
| Current - Test | 2mA |
| Millicandela Rating | 2mcd |
| Viewing Angle | 40° |
| Mounting Type | Through Hole |
| Wavelength - Peak | 590nm |
| Package / Case | Radial |
| Height (Max) | 4.50mm |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution logic for the 3YDL is based on the following critical parameters that must align for functional compatibility:
Primary Compatibility Criteria:
- Color: Yellow
- Lens Transparency: Diffused
- Mounting Type: Through Hole
- Package Type: Radial (T-1 form factor)
- Lens Style: Round configuration
Secondary Compatibility Criteria:
- Voltage - Forward (Vf): 2V nominal operation
- Current - Test: 2mA to 20mA operating range
- Millicandela Rating: 2mcd to 200mcd brightness range
- Viewing Angle: 30° to 120° acceptable range
- Wavelength - Peak: 583nm to 591nm yellow spectrum
Substitute parts are grouped into two categories based on voltage compatibility:
Group 1 - Direct 2V Voltage Substitutes: Parts with 2V forward voltage matching the original 3YDL specification. These include Everlight Electronics models 1254-10UYD/S530-A3, 264-7UYD/S530-A3, and 414-10UYD/S530-A3, and Lite-On Inc. LTL-4251.
Group 2 - Alternative Voltage Substitutes: Parts with different forward voltages (1.8V, 5V, 12V) from Broadcom Limited. These require circuit design consideration but maintain identical physical form factor and optical characteristics.
Parameter Comparison
| Parameter | 3YDL (Bivar) | 1254-10UYD/S530-A3 (Everlight) | 264-7UYD/S530-A3 (Everlight) | 414-10UYD/S530-A3 (Everlight) | HLMP-1620 (Broadcom) | HLMP-1719 (Broadcom) | LTL-4251 (Lite-On) |
|---|---|---|---|---|---|---|---|
| Color | Yellow | Yellow | Yellow | Yellow | Yellow | Yellow | Yellow |
| Lens Transparency | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused |
| Lens Size | 3mm, T-1 | 3.00mm Dia | 2.90mm Dia | 3.00mm Dia | 3mm, T-1 | 3mm, T-1 | 3mm, T-1 |
| Lens Style | Round with Domed Top | Round with Domed Top | Round with Domed Top | Round with Flat Top | Round with Domed Top | Round with Domed Top | Round with Domed Top |
| Voltage - Forward (Vf) (Typ) | 2V | 2V | 2V | 2V | 5V | 1.8V | 2.1V |
| Current - Test | 2mA | 20mA | 20mA | 20mA | 10mA | 2mA | 10mA |
| Millicandela Rating | 2mcd | 200mcd | 125mcd | 40mcd | 2.2mcd | 2.1mcd | 8.7mcd |
| Viewing Angle | 40° | 30° | 60° | 120° | 60° | 50° | 40° |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Wavelength - Peak | 590nm | 591nm | 591nm | 591nm | 583nm | — | 585nm |
| Height (Max) | 4.50mm | 5.20mm | 6.20mm | 7.00mm | 6.35mm | 6.35mm | 6.55mm |
| Package / Case | Radial | Radial | Radial | Radial | Radial | Radial | Radial |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| RoHS Status | — | ROHS3 Compliant | ROHS3 Compliant | — | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct 2V Voltage Replacement:
The Lite-On Inc. LTL-4251 provides the closest electrical match to the 3YDL with 2.1V forward voltage, 10mA test current, and 8.7mcd brightness. This part maintains T-1 form factor compatibility and is ROHS3 compliant with active product status. The LTL-4251 is suitable for applications requiring minimal circuit redesign.
The Everlight Electronics 1254-10UYD/S530-A3 offers 2V forward voltage with higher brightness (200mcd) and 20mA test current. This part is ROHS3 compliant and active. Selection depends on brightness requirements and current budget in the application circuit.
The Everlight Electronics 264-7UYD/S530-A3 provides 2V forward voltage with 125mcd brightness and 60° viewing angle. This part is ROHS3 compliant and active, suitable for applications requiring moderate brightness with wider viewing characteristics.
The Everlight Electronics 414-10UYD/S530-A3 operates at 2V with 40mcd brightness and 120° wide viewing angle. This part is suitable for applications requiring maximum viewing angle coverage.
For Alternative Voltage Operation:
The Broadcom Limited HLMP-1719 operates at 1.8V with 2.1mcd brightness and 2mA test current, matching the original 3YDL current specification. This part is ROHS3 compliant and active, suitable for low-voltage applications.
The Broadcom Limited HLMP-1620 operates at 5V with 2.2mcd brightness and 10mA test current. This part is ROHS3 compliant and active, suitable for standard 5V logic circuit integration.
The Broadcom Limited HLMP-1621 operates at 12V with 2.2mcd brightness and 13mA test current. This part is ROHS3 compliant and active, suitable for 12V industrial and automotive applications.
All recommended substitutes maintain through-hole radial mounting, diffused yellow lens configuration, and T-1 form factor. Product status is active for all alternatives, ensuring long-term availability.
Frequently Asked Questions (FAQ)
Q: Can the 3YDL be directly replaced with any of these substitute parts without circuit modification?
A: Direct replacement without circuit modification is possible only with parts maintaining identical forward voltage (2V). The Lite-On LTL-4251 and Everlight Electronics models (1254-10UYD/S530-A3, 264-7UYD/S530-A3, 414-10UYD/S530-A3) operate at 2V and are compatible with existing 2V bias circuits. Broadcom parts with different voltages (1.8V, 5V, 12V) require circuit redesign.
Q: What is the primary difference between the Everlight Electronics substitute options?
A: The three Everlight models differ in brightness rating and viewing angle. The 1254-10UYD/S530-A3 provides highest brightness (200mcd) with narrow 30° viewing angle. The 264-7UYD/S530-A3 offers moderate brightness (125mcd) with 60° viewing angle. The 414-10UYD/S530-A3 provides lowest brightness (40mcd) with widest 120° viewing angle. Selection depends on application requirements for brightness and viewing geometry.
Q: Are all substitute parts RoHS compliant?
A: All substitute parts listed are ROHS3 compliant. The original 3YDL RoHS status is not specified in available documentation. All active alternatives meet current environmental compliance requirements.
Q: What is the significance of the height difference between the 3YDL (4.50mm) and substitute parts (5.20mm to 7.00mm)?
A: The 3YDL has the shortest maximum height at 4.50mm. Substitute parts range from 5.20mm to 7.00mm. This difference may impact PCB layout and clearance considerations in space-constrained applications. Verify mechanical fit within the target assembly before final selection.
Q: Can the 3YDL be used interchangeably with HLMP-1620 or HLMP-1621?
A: No. The HLMP-1620 operates at 5V and HLMP-1621 operates at 12V, compared to the 3YDL's 2V specification. These parts require different current-limiting resistor values and circuit design. Use only if the application circuit is redesigned for the alternative voltage.
Q: Which substitute part most closely matches the original 3YDL specifications?
A: The Broadcom HLMP-1719 provides the closest electrical match with 1.8V forward voltage and 2mA test current, matching the original 2mA specification. The Lite-On LTL-4251 provides 2.1V forward voltage with 10mA test current, also very close to original specifications.
Q: What packaging options are available for these substitute parts?
A: Everlight Electronics parts are available in Bulk and Tape & Reel packaging. Broadcom parts are available in Bulk and Cut Tape packaging. Packaging selection depends on production volume and assembly process requirements.
Q: Is the wavelength difference between 590nm (3YDL) and 583-591nm (substitutes) significant?
A: The wavelength differences fall within the yellow LED spectrum range and are not visually distinguishable to the human eye. All parts emit yellow light suitable for indicator applications. The 7nm maximum variation is within acceptable tolerance for visual indication purposes.
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