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3SRD-201 Red Diffused T-1 LED Equivalent & Substitute Parts
Part Overview
The 3SRD-201 is a red diffused T-1 through-hole LED manufactured by Bivar Inc., designed for red LED indication applications in discrete 1.7V radial configurations. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The 3SRD-201 features a 3mm round domed lens with 40mcd brightness rating and 35° viewing angle, suitable for standard indicator applications requiring through-hole mounting.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 3SRD-201 |
| Manufacturer | Bivar Inc. |
| Product Status | Obsolete |
| Color | Red |
| Lens Transparency | Diffused |
| Lens Size | 3mm, T-1 |
| Voltage - Forward (Vf) Typical | 1.7V |
| Current - Test | 20mA |
| Millicandela Rating | 40mcd |
| Viewing Angle | 35° |
| Wavelength - Peak | 645nm |
| Mounting Type | Through Hole |
| Package / Case | Radial |
| Height (Max) | 5.10mm |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the 3SRD-201 is determined by the following critical parameters:
Primary Compatibility Criteria:
- Color: Red
- Lens Transparency: Diffused
- Lens Size: 3mm, T-1
- Mounting Type: Through Hole
- Package / Case: Radial
- Voltage - Forward (Vf) Typical: 1.7V (primary specification)
- Current - Test: 20mA (primary specification)
Secondary Compatibility Criteria:
- Millicandela Rating: 40mcd
- Viewing Angle: 35°
- Wavelength - Peak: 645nm
- Height (Max): 5.10mm
Substitute parts are grouped 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, lens type, and mounting configuration but with variations in forward voltage, brightness rating, viewing angle, or wavelength that may require circuit design verification.
Parameter Comparison
| Parameter | 3SRD-201 | 3SRD-F | 151031SS06000 | 4300F1LC | HLMP-1301-G00FG | HLMP-1600 | HLMP-1700 |
|---|---|---|---|---|---|---|---|
| Manufacturer | Bivar Inc. | Bivar Inc. | Würth Elektronik | Visual Communications Company - VCC | Broadcom Limited | Broadcom Limited | Broadcom Limited |
| Product Status | Obsolete | Active | Active | Not For New Designs | Active | Active | Active |
| Color | Red | Red | Red | Red | Red | Red | Red |
| Lens Transparency | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused |
| Lens Size | 3mm, T-1 | 3mm, T-1 | 3.00mm Dia | 3mm, T-1 | 3mm, T-1 | 3mm, T-1 | 3mm, T-1 |
| Voltage - Forward (Vf) Typical | 1.7V | 1.7V | 2.2V | 1.8V | 1.9V | 5V | 1.7V |
| Current - Test | 20mA | 20mA | 20mA | 2mA | 10mA | 10mA | 2mA |
| Millicandela Rating | 40mcd | 40mcd | 35mcd | 1.8mcd | 8.6mcd | 2.1mcd | 2.1mcd |
| Viewing Angle | 35° | 35° | 60° | 50° | 60° | 60° | 50° |
| Wavelength - Peak | 645nm | 645nm | 650nm | 635nm | 635nm | 635nm | 635nm |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | Radial | Radial | Radial | Radial | Radial | Radial | Radial |
| Height (Max) | 5.10mm | 5.30mm | 5.55mm | 6.35mm | 6.35mm | 6.35mm | 6.35mm |
| RoHS Status | Not specified | ROHS3 Compliant | 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) | 1 (Unlimited) |
Engineering Selection Recommendations
Parametric Equivalent - Recommended Primary Substitute:
The 3SRD-F (Bivar Inc.) is the parametric equivalent of the 3SRD-201. It maintains identical electrical specifications (1.7V forward voltage, 20mA test current, 40mcd brightness) and mechanical form factor (3mm T-1 diffused lens, through-hole radial package). The 3SRD-F is classified as Active product status, ensuring ongoing availability and supply chain continuity. The maximum height difference of 0.20mm (5.30mm vs. 5.10mm) is within typical PCB layout tolerances. This part is the direct replacement for obsolete designs.
Active Status Alternatives for New Designs:
For new design implementations, the following active parts provide functional equivalence with noted parameter variations:
HLMP-1700 / HLMP-1700-B0002 (Broadcom Limited) match the 1.7V forward voltage specification and maintain identical form factor. These parts operate at 2mA test current (versus 20mA for the 3SRD-201) with reduced brightness (2.1mcd versus 40mcd). Selection requires verification that reduced brightness is acceptable for the application. HLMP-1700-B0002 is available in Cut Tape packaging for automated assembly.
151031SS06000 (Würth Elektronik) provides similar brightness (35mcd) and maintains the 3mm diffused lens form factor. Forward voltage is elevated to 2.2V, requiring circuit design adjustment. This part is ROHS3 compliant and REACH unaffected.
Parts Not Recommended for Direct Substitution:
4300F1LC (Visual Communications Company - VCC) is classified as Not For New Designs and exhibits significantly reduced brightness (1.8mcd) and lower test current (2mA), making it unsuitable for applications requiring the 40mcd specification of the 3SRD-201.
HLMP-1600 / HLMP-1601 (Broadcom Limited) operate at 5V and 12V forward voltages respectively, requiring complete circuit redesign and are not suitable for 1.7V applications.
HLMP-1600-D00A1 / HLMP-1600-D00A2 feature right-angle mounting configuration, incompatible with radial through-hole PCB layouts specified for the 3SRD-201.
HLMP-1301-G00FG (Broadcom Limited) operates at 1.9V forward voltage with significantly reduced brightness (8.6mcd) and lower test current (10mA), requiring application verification.
Frequently Asked Questions (FAQ)
Q: Can the 3SRD-F directly replace the 3SRD-201 without circuit modification?
A: Yes. The 3SRD-F is a parametric equivalent with identical forward voltage (1.7V), test current (20mA), brightness (40mcd), and form factor. The 0.20mm height difference is within standard PCB layout tolerances. No circuit modification is required.
Q: Why do some substitute parts have different forward voltages?
A: Forward voltage is a fundamental LED characteristic determined by the semiconductor material and doping profile. Parts with different forward voltages (such as HLMP-1600 at 5V or 151031SS06000 at 2.2V) require circuit redesign to maintain proper current limiting and brightness performance. Direct substitution without circuit modification will result in incorrect LED operation.
Q: What is the significance of the millicandela rating difference between the 3SRD-201 (40mcd) and alternatives like HLMP-1700 (2.1mcd)?
A: Millicandela rating directly determines LED brightness. The 3SRD-201 at 40mcd is approximately 19 times brighter than HLMP-1700 at 2.1mcd. Applications requiring high-visibility indication must use parts with comparable brightness ratings. Lower brightness alternatives are suitable only for applications where reduced visibility is acceptable.
Q: Are all substitute parts RoHS3 compliant?
A: The 3SRD-201 does not specify RoHS status. All recommended active substitute parts (3SRD-F, HLMP-1700, HLMP-1700-B0002, 151031SS06000, HLMP-1301-G00FG, HLMP-1600, HLMP-1601) are ROHS3 compliant, meeting current environmental regulations for new designs.
Q: What is the difference between the HLMP-1700 and HLMP-1700-B0002?
A: Both parts are electrically and mechanically identical. The primary difference is packaging format: HLMP-1700 is supplied in Bulk packaging, while HLMP-1700-B0002 is supplied in Cut Tape (CT) format suitable for automated pick-and-place assembly. Electrical specifications, brightness, forward voltage, and form factor are identical.
Q: Can the 3SRD-201 be used in applications requiring the HLMP-1600-D00A1 or HLMP-1600-D00A2?
A: No. The HLMP-1600-D00A1 and HLMP-1600-D00A2 feature right-angle mounting configuration for circuit board indicator applications, while the 3SRD-201 is a radial through-hole component. These parts are mechanically incompatible and serve different PCB layout requirements.
Q: What viewing angle should be considered when selecting a substitute?
A: The 3SRD-201 specifies a 35° viewing angle, which is narrower than many alternatives (HLMP-1700 at 50°, HLMP-1600 at 60°, 151031SS06000 at 60°). Wider viewing angles provide visibility from greater off-axis angles. Applications requiring the specific 35° viewing angle should prioritize the 3SRD-F or verify that wider angles are acceptable for the intended use.
Q: Is the 151031SS06000 a suitable substitute despite the 2.2V forward voltage?
A: The 151031SS06000 can function as a substitute only if circuit design is modified to accommodate the 2.2V forward voltage. The 0.5V increase requires adjustment of current-limiting resistor values to maintain proper LED operation. This part is suitable for new designs where circuit modification is feasible, but not for direct drop-in replacement of the 3SRD-201.
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