HLMP1340 Equivalent & Substitute Parts

Part Overview

The HLMP1340 is a red LED indicator in T-1 through-hole package manufactured by onsemi. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The HLMP1340 features a 3mm clear lens with 60mcd brightness rating and 2.2V forward voltage, designed for standard LED indication circuits requiring red wavelength output in the 635nm peak range.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMP1340
Manufacturer	onsemi
Color	Red
Lens Size	3mm, T-1
Lens Transparency	Clear
Mounting Type	Through Hole
Package / Case	Radial
Voltage - Forward (Vf) (Typ)	2.2V
Current - Test	10mA
Millicandela Rating	60mcd
Viewing Angle	45°
Wavelength - Peak	635nm
Height (Max)	6.30mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the HLMP1340 is determined by the following critical parameters: color (red), lens size (3mm T-1), mounting type (through-hole radial), and package compatibility. Forward voltage tolerance, brightness rating variation, and viewing angle differences are acceptable within typical LED indication circuit design margins. Lens transparency (clear vs. diffused) represents a functional difference but does not prevent substitution in applications where optical diffusion is acceptable or beneficial.

The substitute parts are grouped into two categories:

Category 1 - Direct Mechanical & Electrical Compatibility: Parts with matching T-1 through-hole radial package, 3mm lens size, and forward voltage within ±0.4V of the original specification. These parts maintain the same physical footprint and circuit integration requirements.

Category 2 - Functional Equivalence with Design Considerations: Parts with T-1 through-hole radial package and 3mm lens size but with diffused lens transparency or forward voltage variations exceeding ±0.4V. These require circuit verification for brightness and optical characteristics.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Lens Transparency	Vf (Typ)	Current - Test	Millicandela	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status
HLMP1340	onsemi	Red	3mm, T-1	Clear	2.2V	10mA	60mcd	45°	635nm	6.30mm	Obsolete
HLMP-1340	Broadcom Limited	Red	3mm, T-1	Clear	1.9V	20mA	55mcd	24°	635nm	6.35mm	Active
LTL-4222	Lite-On Inc.	Red	3mm, T-1	Clear	2V	10mA	8.7mcd	20°	635nm	6.55mm	Active
LTL-4262N	Lite-On Inc.	Red	3mm, T-1	Clear	1.8V	20mA	80mcd	45°	660nm	5.85mm	Active
SLI-343UR3F	Rohm Semiconductor	Red	3.10mm Dia	Diffused	1.9V	20mA	350mcd	40°	620nm	5.60mm	Not For New Designs
SLI-343URC3F	Rohm Semiconductor	Red	3.10mm Dia	Diffused	1.9V	20mA	450mcd	40°	620nm	5.60mm	Not For New Designs
SLI-343URCT32	Rohm Semiconductor	Red	3.10mm Dia	Clear	1.9V	20mA	450mcd	40°	620nm	5.60mm	Active

Engineering Selection Recommendations

Primary Substitute - HLMP-1340 (Broadcom Limited): This part shares the identical part number designation and maintains T-1 through-hole radial package compatibility. Forward voltage is 0.3V lower (1.9V vs. 2.2V), which is within acceptable tolerance for most LED indication circuits. The part is currently in active production status with RoHS3 compliance. Brightness is marginally lower at 55mcd versus 60mcd. Viewing angle is narrower at 24° compared to 45°, which may affect visibility in wide-angle applications.

Secondary Substitute - LTL-4262N (Lite-On Inc.): This part offers the closest brightness match at 80mcd and maintains the 45° viewing angle of the original. Forward voltage is 0.4V lower at 1.8V. Physical height is reduced to 5.85mm. The part is in active production with RoHS3 compliance. This option is suitable for applications where brightness and viewing angle are critical parameters.

Alternative Substitute - SLI-343URCT32 (Rohm Semiconductor): This part features clear lens transparency matching the original specification and is in active production status. Brightness is significantly higher at 450mcd. Forward voltage is 0.3V lower at 1.9V. The diffused variants (SLI-343UR3F and SLI-343URC3F) are classified as "Not For New Designs" and should be avoided for new applications despite higher brightness ratings.

Not Recommended - LTL-4222 (Lite-On Inc.): While mechanically compatible, this part exhibits significantly reduced brightness at 8.7mcd, which is insufficient for most indication applications requiring the original 60mcd specification.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-1340 (Broadcom) as a direct replacement for HLMP1340 (onsemi)?

A: Yes. Both parts share identical part number designation and T-1 through-hole radial package. Forward voltage difference of 0.3V is within acceptable tolerance for standard LED indication circuits. However, the narrower 24° viewing angle may affect visibility in applications requiring wide-angle indication.

Q: What is the difference between clear and diffused lens transparency in these substitutes?

A: Clear lens transparency provides direct light output with sharp brightness concentration. Diffused lens transparency scatters light over a wider area, reducing peak brightness but improving visibility from off-axis angles. The original HLMP1340 uses clear transparency. Diffused alternatives (SLI-343 series) are functionally equivalent but produce different optical characteristics.

Q: Are the SLI-343 series parts suitable for new designs?

A: SLI-343UR3F and SLI-343URC3F are classified as "Not For New Designs" by Rohm Semiconductor. Only SLI-343URCT32 is in active production status and suitable for new applications. The "Not For New Designs" designation indicates these parts may have limited future availability or support.

Q: How do forward voltage differences affect circuit design?

A: Forward voltage variations of ±0.3V to ±0.4V are typical among LED substitutes and do not require circuit redesign in standard current-limiting resistor configurations. Existing series resistor values will accommodate these variations. However, applications with tight voltage budgets or precision current control should verify compatibility.

Q: What is the significance of the T-1 package designation?

A: T-1 designates a through-hole LED package with 3mm lens diameter and radial leads. All substitute parts maintain this package standard, ensuring mechanical compatibility with existing PCB layouts and component holders. Physical height variations (5.60mm to 6.55mm) are minor and do not affect standard through-hole mounting.

Q: Which substitute offers the best brightness match?

A: LTL-4262N provides the closest brightness match at 80mcd compared to the original 60mcd specification. SLI-343URCT32 offers significantly higher brightness at 450mcd, which may require circuit adjustment if precise brightness control is required.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry RoHS3 compliance certification. The original HLMP1340 does not specify RoHS status. This compliance is beneficial for applications subject to environmental regulations.

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