LTL-1CHPE Equivalent & Substitute Parts

Part Overview

The LTL-1CHPE is a red LED indication component manufactured by Lite-On Inc., featuring a 657nm dominant wavelength and 2.1V forward voltage rating. This through-hole radial LED is designed for discrete indication applications with a 3.10mm domed lens and 8.7mcd brightness rating. The component is currently classified as obsolete, making substitute part identification essential for ongoing production and maintenance applications. Equivalent alternatives must maintain functional compatibility across electrical characteristics, mechanical form factor, and mounting requirements.

Key Parameters

Parameter	LTL-1CHPE Value
Color	Red
Lens Transparency	Clear
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Mounting Type	Through Hole
Package / Case	Radial
Wavelength - Dominant	657nm
Lens Size	3.10mm Dia
Millicandela Rating	8.7mcd
Viewing Angle	45°
Height (Max)	5.20mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution compatibility for the LTL-1CHPE is determined by the following critical parameters:

Electrical Compatibility: Forward voltage (Vf) tolerance of ±0.2V from the 2.1V specification and test current rating of 20mA establish the primary electrical substitution window. Parts operating at 1.9V to 2.1V with 10mA or 20mA test ratings are electrically compatible.

Optical Characteristics: Red color and clear lens transparency are mandatory. Wavelength dominance in the 624nm to 657nm range maintains visual consistency. Millicandela ratings between 8.7mcd and 30mcd preserve brightness compatibility for indication applications.

Mechanical Form Factor: Through-hole radial mounting with 3mm to 3.20mm lens diameter and maximum height between 4.10mm and 6.35mm ensures PCB layout compatibility. Lens style (domed or flat top) does not restrict substitution.

Compliance & Status: Active product status and RoHS3 compliance are preferred for new applications. Obsolete or "Not For New Designs" status parts are acceptable only for legacy system maintenance.

Parameter Comparison

Parameter	LTL-1CHPE	484-10SURT/S530-A3	5219432F	HLMP-1321	HLMP-Y301-F0000	SLR-332VC3F	TLHK4200
Manufacturer	Lite-On Inc.	Everlight Electronics	Dialight	Broadcom Limited	Broadcom Limited	Rohm Semiconductor	Vishay Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Color	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear
Vf (Typ)	2.1V	2.0V	—	1.9V	2.1V	2.0V	1.9V
Current - Test	20mA	20mA	20mA	10mA	20mA	10mA	10mA
Millicandela Rating	8.7mcd	20mcd	29mcd	30mcd	19mcd	10mcd	100mcd
Wavelength - Dominant	657nm	624nm	—	626nm	626nm	630nm	630nm
Viewing Angle	45°	130°	—	45°	45°	85°	44°
Lens Size	3.10mm Dia	3.00mm Dia	2.90mm Dia	3mm, T-1	3mm, T-1	3.20mm Dia	3mm, T-1
Height (Max)	5.20mm	4.10mm	5.89mm	6.35mm	5.20mm	4.60mm	6.10mm
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
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

HLMP-Y301-F0000 (Broadcom Limited) provides the closest electrical match with identical 2.1V forward voltage and 20mA test current. Active product status and RoHS3 compliance support new design integration. Identical maximum height (5.20mm) ensures direct PCB layout compatibility.

484-10SURT/S530-A3 (Everlight Electronics) offers 2.0V forward voltage operation at 20mA test current with active status and RoHS3 compliance. Reduced maximum height (4.10mm) provides additional PCB clearance margin. Elevated viewing angle (130°) suits applications requiring wider light distribution.

Secondary Substitutes (Acceptable with Design Review):

HLMP-1321 and HLMP-1321-G0002 (Broadcom Limited) operate at 1.9V forward voltage with 10mA test current, requiring circuit current-limiting adjustment. Active status and RoHS3 compliance are confirmed. Increased maximum height (6.35mm) demands PCB layout verification.

SLR-332VC3F and SLR-332VCT32 (Rohm Semiconductor) provide 2.0V forward voltage at 10mA test current with active status and RoHS3 compliance. Wider viewing angle (85°) and compact height (4.60mm) support space-constrained applications.

TLHK4200 (Vishay Semiconductor Opto Division) operates at 1.9V forward voltage with 10mA test current and active status. Significantly elevated brightness (100mcd) requires application brightness tolerance verification.

Legacy Maintenance Only:

SLR-342VCTB7 (Rohm Semiconductor) carries "Not For New Designs" status and is suitable only for replacement in existing systems. 2.0V forward voltage at 10mA test current and RoHS3 compliance support legacy maintenance.

5219432F (Dialight) lacks specified forward voltage and wavelength data, limiting substitution confidence for new applications. Active status and RoHS3 compliance are confirmed. Use restricted to applications where brightness (29mcd) and mechanical form factor are the primary selection criteria.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1321 directly replace LTL-1CHPE without circuit modification?

A: HLMP-1321 operates at 1.9V forward voltage versus LTL-1CHPE's 2.1V specification. Direct substitution requires circuit current-limiting resistor recalculation to maintain 10mA test current operation. Verify that the application circuit can accommodate the lower voltage drop.

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

A: Millicandela rating determines LED brightness. TLHK4200 (100mcd) is significantly brighter than LTL-1CHPE (8.7mcd). Substitution is acceptable only if the application tolerates increased brightness or if optical filtering is implemented. Dimmer alternatives like SLR-332VC3F (10mcd) are suitable for brightness-sensitive applications.

Q: Are viewing angle differences critical for substitution?

A: Viewing angle affects light distribution pattern. LTL-1CHPE specifies 45° viewing angle. 484-10SURT/S530-A3 (130° wide angle) distributes light over a broader area, suitable for applications requiring wider visibility. Narrower angle alternatives maintain focused light distribution. Verify application requirements before substitution.

Q: Does lens size variation affect PCB compatibility?

A: Lens diameter ranges from 2.90mm to 3.20mm across substitute parts. This variation is within standard through-hole LED tolerance and does not restrict PCB layout compatibility. Maximum height variation (4.10mm to 6.35mm) is more critical for clearance verification, particularly in space-constrained designs.

Q: Why is product status important for substitution selection?

A: Active status parts ensure long-term availability and manufacturer support. Obsolete parts like LTL-1CHPE face supply discontinuation. "Not For New Designs" parts are acceptable for legacy system maintenance but not recommended for new product development. RoHS3 compliance confirms environmental and regulatory compliance for current manufacturing standards.

Q: Can I substitute based on wavelength alone?

A: Wavelength determines perceived color but is not the sole substitution criterion. Electrical parameters (Vf, test current), mechanical form factor (lens size, height), and optical characteristics (brightness, viewing angle) must align with application requirements. Wavelength compatibility (624nm to 657nm range) supports visual consistency but requires concurrent verification of other parameters.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Bulk, Cut Tape (CT), and Tape & Box (TB) packaging. Packaging selection depends on production volume and assembly process requirements. Electrical and optical specifications remain identical across packaging variants for the same base part number.

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