HLMP1700L Red LED T-1 Equivalent & Substitute Parts

Part Overview

The HLMP1700L is a red diffused T-1 through-hole LED manufactured by onsemi, designed for indication applications requiring discrete 1.8V operation. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The HLMP1700L operates at 1.8V forward voltage with a 2mA test current, delivering 2 millicandela brightness in a standard 3mm T-1 package with 50° viewing angle. The diffused lens provides uniform light distribution suitable for general indication purposes.

Substiute Parts

HLMP1700L

onsemiIn Stock: 1191HLMP1700L Datasheet

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HLMP-1700

Broadcom LimitedIn Stock: 530351HLMP-1700 Datasheet

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LTL-4261N

Lite-On Inc.In Stock: 785LTL-4261N Datasheet

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SLI-343U8R3F

Rohm SemiconductorIn Stock: 25233SLI-343U8R3F Datasheet

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SLI-343U8RC3F

Rohm SemiconductorIn Stock: 1585SLI-343U8RC3F Datasheet

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SLI-343V8R3F

Rohm SemiconductorIn Stock: 2908SLI-343V8R3F Datasheet

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SLI-343V8RC3F

Rohm SemiconductorIn Stock: 10059SLI-343V8RC3F Datasheet

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TLLR4400

Vishay Semiconductor Opto DivisionIn Stock: 14285TLLR4400 Datasheet

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TLLR4401

Vishay Semiconductor Opto DivisionIn Stock: 6121TLLR4401 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the HLMP1700L is determined by the following critical parameters:

• Color & Wavelength: Red spectrum (620–638nm dominant wavelength)
• Lens Configuration: Diffused lens, 3mm T-1 package
• Electrical Characteristics: Forward voltage (Vf) range 1.7V–2.2V; test current 2mA–20mA
• Optical Output: Millicandela rating 1.2mcd–330mcd
• Viewing Angle: 40°–60°
• Mounting: Through-hole radial configuration
• Compliance: RoHS3 compliant, REACH unaffected, MSL 1

Substitute parts are grouped into two categories based on electrical operating point:

Group A (Low-Current Operation, 2mA Test): HLMP-1700, TLLR4400, TLLR4401 — Direct electrical compatibility with 2mA test current and similar forward voltage profiles (1.7V–1.9V).

Group B (Higher-Current Operation, 20mA Test): LTL-4261N, SLI-343U8R3F, SLI-343U8RC3F, SLI-343V8R3F, SLI-343V8RC3F — Designed for 20mA test current with elevated forward voltage (2.2V) and higher brightness output (60mcd–330mcd).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (2mA Operation)

HLMP-1700 (Broadcom Limited) and TLLR4401 (Vishay) are the primary active alternatives. Both maintain 2mA test current operation and 50° viewing angle matching the HLMP1700L. HLMP-1700 offers the closest electrical profile (1.7V Vf, 2.1mcd) with active product status and RoHS3 compliance. TLLR4401 provides identical 2mcd brightness with 1.9V Vf and is also RoHS3 compliant.

For Higher-Brightness Applications (20mA Operation)

If circuit design permits 20mA operation, the Rohm Semiconductor EXCELED™ series (SLI-343U8R3F, SLI-343V8R3F, SLI-343V8RC3F) deliver 220–330mcd output with 2.2V Vf. These parts require circuit redesign to accommodate higher forward voltage and current but provide significantly enhanced optical output. All are RoHS3 compliant and actively manufactured.

LTL-4261N (Lite-On) operates at 1.8V Vf with 60mA brightness at 20mA test current, offering a moderate brightness increase while maintaining the original forward voltage specification.

Compliance Considerations

All substitute parts listed are RoHS3 compliant and REACH unaffected. MSL rating remains 1 (Unlimited) across all alternatives, ensuring consistent moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1700 directly replace HLMP1700L without circuit modification?

A: Yes. HLMP-1700 operates at 1.7V Vf with 2mA test current, matching the electrical operating point of HLMP1700L. Both use identical 3mm T-1 through-hole radial packages with 50° viewing angle and diffused lenses. No circuit changes are required.

Q: What is the difference between Group A and Group B substitutes?

A: Group A substitutes (HLMP-1700, TLLR4400, TLLR4401) operate at 2mA test current, identical to HLMP1700L. Group B substitutes (LTL-4261N, SLI-343 series) operate at 20mA test current and require circuit redesign to accommodate higher forward voltage (2.2V) and current draw. Group B parts deliver significantly higher brightness (60–330mcd versus 2mcd).

Q: Are the Rohm SLI-343 variants interchangeable?

A: The SLI-343 variants share the same base part number but differ in lens transparency and dominant wavelength. SLI-343U8R3F and SLI-343U8RC3F both operate at 620nm with diffused and clear lenses respectively. SLI-343V8R3F and SLI-343V8RC3F operate at 630nm. All deliver 330mcd at 20mA test current. Selection depends on required wavelength and lens transparency for the application.

Q: What is the impact of forward voltage differences on circuit design?

A: HLMP1700L operates at 1.8V Vf. Substitutes range from 1.7V (HLMP-1700) to 2.2V (Rohm SLI-343 series). Low-voltage substitutes (1.7–1.9V) require minimal circuit adjustment. High-voltage substitutes (2.2V) require recalculation of series resistor values to maintain proper current limiting, particularly if operating at 20mA instead of 2mA.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. HLMP1700L's RoHS status is not specified in the provided data; however, all active alternatives meet current RoHS3 requirements.

Q: Can I use a clear lens substitute (SLI-343U8RC3F) instead of diffused?

A: Clear lens variants deliver higher brightness concentration (330mcd versus 220mcd for diffused) but produce a more directional light beam. Substitution is application-dependent. If uniform light distribution is required, diffused lens variants (SLI-343U8R3F, SLI-343V8R3F, SLI-343V8RC3F) are appropriate. If concentrated brightness is acceptable, clear lens variants are suitable.

Q: What is the viewing angle impact when substituting?

A: HLMP1700L specifies 50° viewing angle. Most Group A substitutes maintain 50°. Rohm SLI-343 series parts specify 40° viewing angle, resulting in more concentrated light output. LTL-4261N specifies 60° for wider light distribution. Selection depends on application requirements for light spread.