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Equivalent & Substitute Parts for Bivar Inc. 3YD-201 Yellow LED T-1 Through Hole
Part Overview
The Bivar Inc. 3YD-201 is a yellow diffused LED indicator in T-1 (3mm) through-hole package, rated at 2V forward voltage with 20mcd brightness. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The part operates at 20mA test current with a 35° viewing angle and 590nm peak wavelength, designed for discrete yellow LED indication applications in radial mounting configurations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 3YD-201 |
| Manufacturer | Bivar Inc. |
| Product Status | Obsolete |
| Color | Yellow |
| Lens Transparency | Diffused |
| Lens Size | 3mm, T-1 |
| Voltage - Forward (Vf) (Typ) | 2V |
| Current - Test | 20mA |
| Millicandela Rating | 20mcd |
| Viewing Angle | 35° |
| Wavelength - Peak | 590nm |
| Mounting Type | Through Hole |
| Package / Case | Radial |
| Height (Max) | 5.10mm |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the 3YD-201 is determined by the following critical parameters:
Primary Matching Criteria:
- Color: Yellow
- Lens Transparency: Diffused
- Lens Size: 3mm, T-1
- Mounting Type: Through Hole
- Package / Case: Radial
- Voltage - Forward (Vf): 2V (±tolerance acceptable)
- Current - Test: 20mA (±tolerance acceptable)
- Wavelength - Peak: 590nm (±tolerance acceptable)
Secondary Compatibility Factors:
- Millicandela Rating: 20mcd (brightness level)
- Viewing Angle: 35° (±tolerance acceptable)
- Height (Max): 5.10mm (physical fit consideration)
Substitute parts are classified into two categories:
Parametric Equivalent: Parts with identical or near-identical electrical and mechanical specifications, differing only in product status or packaging format.
Similar Parts: Components sharing the same form factor, color, and mounting type but with variations in forward voltage, brightness, viewing angle, or test current. These require circuit-level evaluation for compatibility.
Parameter Comparison
| Parameter | 3YD-201 (Main) | 3YD-F | 264-7UYD/S530-A3 | HLMP-1620 | LTL-4251 | LTL-4251N |
|---|---|---|---|---|---|---|
| Manufacturer | Bivar Inc. | Bivar Inc. | Everlight Electronics Co Ltd | Broadcom Limited | Lite-On Inc. | Lite-On Inc. |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| Color | Yellow | Yellow | Yellow | Yellow | Yellow | Yellow |
| Lens Transparency | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused |
| Lens Size | 3mm, T-1 | 3mm, T-1 | 2.90mm Dia | 3mm, T-1 | 3mm, T-1 | 3mm, T-1 |
| Voltage - Forward (Vf) (Typ) | 2V | 2V | 2V | 5V | 2.1V | 2.1V |
| Current - Test | 20mA | 20mA | 20mA | 10mA | 10mA | 10mA |
| Millicandela Rating | 20mcd | 20mcd | 125mcd | 2.2mcd | 8.7mcd | 5.6mcd |
| Viewing Angle | 35° | 35° | 60° | 60° | 40° | 60° |
| Wavelength - Peak | 590nm | 590nm | 591nm | 583nm | 585nm | 585nm |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | Radial | Radial | Radial | Radial | Radial | Radial |
| Height (Max) | 5.10mm | 5.30mm | 6.20mm | 6.35mm | 6.55mm | 5.85mm |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Parametric Equivalent:
The Bivar Inc. 3YD-F is the primary substitute for the 3YD-201. This part maintains identical electrical specifications (2V forward voltage, 20mA test current, 20mcd brightness) and mechanical form factor (3mm T-1 through-hole radial package). The 3YD-F is currently in active production status with 867 units in stock, providing immediate design continuity. The maximum height increases from 5.10mm to 5.30mm, a 0.20mm difference that remains within typical PCB layout tolerances. The 3YD-F carries ROHS3 compliance certification, meeting current environmental standards.
Compatible Alternatives with Circuit Evaluation Required:
The Lite-On Inc. LTL-4251N provides a close alternative with matching 2.1V forward voltage and 3mm T-1 form factor. This part operates at 10mA test current (versus 20mA for the 3YD-201), resulting in lower brightness at 5.6mcd. The LTL-4251N is suitable for applications where reduced brightness is acceptable or where current limiting is implemented in the circuit design. This part is ROHS3 compliant and REACH unaffected, with 32,761 units in stock.
The Lite-On Inc. LTL-4251 offers 8.7mcd brightness at 2.1V forward voltage with 10mA test current and 40° viewing angle. Height is 6.55mm, requiring verification of PCB clearance. This part is ROHS3 compliant but REACH affected.
Not Recommended for Direct Substitution:
The Broadcom Limited HLMP-1620 series (HLMP-1620, HLMP-1620-C00A1, HLMP-1620-C00A2) operates at 5V forward voltage with significantly reduced brightness (2.2mcd) and 10mA test current. These parts require complete circuit redesign and are not suitable for direct pin-for-pin replacement.
The Broadcom Limited HLMP-1621 operates at 12V forward voltage and is not compatible with 2V circuit designs.
The Broadcom Limited HLMP-1719 and HLMP-1719-A0002 operate at 1.8V forward voltage with minimal brightness (2.1mcd) and 2mA test current, unsuitable for applications requiring 20mcd output.
The Everlight Electronics Co Ltd 264-7UYD/S530-A3 provides significantly higher brightness (125mcd) at 2V forward voltage. While electrically compatible, the substantially increased brightness may cause visual or functional issues in designs optimized for 20mcd output.
Frequently Asked Questions (FAQ)
Q: Can the 3YD-F directly replace the 3YD-201 without circuit modifications?
A: Yes. The 3YD-F is a parametric equivalent with identical forward voltage (2V), test current (20mA), brightness (20mcd), and form factor (3mm T-1 through-hole radial). The 0.20mm height difference (5.30mm versus 5.10mm) does not affect standard PCB layouts. No circuit modifications are required.
Q: What is the key difference between the 3YD-201 and LTL-4251N?
A: The primary difference is test current: the 3YD-201 operates at 20mA while the LTL-4251N operates at 10mA. This results in lower brightness for the LTL-4251N (5.6mcd versus 20mcd). Forward voltage is similar (2V versus 2.1V). The LTL-4251N is suitable only if reduced brightness is acceptable in the application.
Q: Why are Broadcom HLMP-1620 series parts not recommended?
A: The HLMP-1620 series operates at 5V forward voltage compared to the 3YD-201's 2V rating. Direct substitution would require complete circuit redesign including voltage supply changes and current limiting adjustments. Additionally, brightness is significantly reduced (2.2mcd versus 20mcd).
Q: Is the 264-7UYD/S530-A3 from Everlight a suitable substitute?
A: The 264-7UYD/S530-A3 matches the 2V forward voltage and 20mA test current of the 3YD-201. However, brightness is substantially higher at 125mcd compared to 20mcd. This part is electrically compatible but may cause visual or functional issues in designs optimized for the lower brightness of the original part. Circuit-level evaluation is required.
Q: What compliance certifications should I verify for substitute parts?
A: All recommended substitute parts carry ROHS3 compliance certification. The LTL-4251N is REACH unaffected, while the LTL-4251 is REACH affected. Verify compliance requirements for your specific application and regulatory jurisdiction before final part selection.
Q: Are there packaging format differences between the 3YD-201 and 3YD-F?
A: Yes. The 3YD-201 is specified with "-" packaging (not detailed in provided data), while the 3YD-F is supplied in Bulk packaging. Both use identical T-1 radial through-hole form factor. Verify packaging requirements for your procurement and assembly processes.
Q: What is the viewing angle difference between the 3YD-201 and substitute parts?
A: The 3YD-201 has a 35° viewing angle. The LTL-4251N and Everlight 264-7UYD/S530-A3 offer 60° viewing angles, providing wider light distribution. The LTL-4251 offers 40°. Wider viewing angles may affect visual indication characteristics in the application. Evaluate based on specific design requirements.
Q: Can I use multiple lower-brightness LEDs in parallel to replace the 3YD-201?
A: This question falls outside the scope of parametric equivalence. Parallel LED configurations require separate circuit design analysis including current balancing, thermal management, and reliability considerations. Consult application-specific design guidelines.
Q: What is the inventory status for substitute parts?
A: The 3YD-F has 867 units in stock. The LTL-4251N has 32,761 units in stock, providing the highest availability. The LTL-4251 has 7,627 units in stock. All recommended substitutes are currently available from inventory.
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