LTL-4252 Equivalent & Substitute Parts

Part Overview

The LTL-4252 is a yellow 588nm LED indication component manufactured by Lite-On Inc., configured as a through-hole radial T-1 (3mm) package. This active product delivers 19mcd at 2.1V forward voltage with a 20° viewing angle and 6.55mm maximum height. The component is ROHS3 compliant and carries MSL 2A rating.

Substitute parts are necessary when the primary LTL-4252 becomes unavailable, when inventory constraints require alternative sourcing, or when design flexibility permits selection from qualified equivalent components that meet the same electrical and mechanical specifications.

Substiute Parts

LTL-4252

Lite-On Inc.In Stock: 968LTL-4252 Datasheet

Current PartRFQ

HLMP-1420

Broadcom LimitedIn Stock: 25744HLMP-1420 Datasheet

MFR RecommendedRFQ

HLMP-1421

Broadcom LimitedIn Stock: 11697HLMP-1421 Datasheet

MFR RecommendedRFQ

HLMP-Y402-G0000

Broadcom LimitedIn Stock: 55788HLMP-Y402-G0000 Datasheet

MFR RecommendedRFQ

SLR-332YC3F

Rohm SemiconductorIn Stock: 2671SLR-332YC3F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-4252 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Yellow
• Lens Size: 3mm, T-1 package
• Mounting Type: Through Hole
• Package Configuration: Radial
• Voltage - Forward (Vf): 2.0V to 2.1V range
• Current - Test: 10mA operation
• RoHS Compliance: ROHS3 Compliant

Secondary Consideration Parameters:

• Wavelength - Dominant: 585nm to 588nm range
• Millicandela Rating: Minimum 10mcd
• Viewing Angle: 20° to 85° range
• Height (Max): 4.60mm to 6.55mm range

The substitute parts HLMP-1420, HLMP-1421, and SLR-332YC3F meet all primary compatibility criteria and fall within acceptable secondary parameter ranges. The part HLMP-Y402-G0000 is listed as a substitute but operates with orange wavelength (605nm) and higher test current (20mA), representing a functional alternative only in applications where color and current specifications permit deviation.

Parameter Comparison

Engineering Selection Recommendations

HLMP-1420 and HLMP-1421 (Broadcom Limited): Both parts are direct functional equivalents for the LTL-4252 in yellow LED indication applications. They operate at 2.0V forward voltage (0.1V lower than LTL-4252), maintain 10mA test current, and provide 15mcd output. The 45° viewing angle exceeds the LTL-4252's 20° specification, offering broader light distribution. Both components are ROHS3 compliant with MSL 1 (Unlimited) rating, providing superior moisture handling compared to the LTL-4252's MSL 2A specification. Height differential of 0.20mm is negligible for most PCB layouts. Inventory availability is substantial (25,715 and 11,600 units respectively).

SLR-332YC3F (Rohm Semiconductor): This part operates within compatible electrical parameters (2.1V, 10mA) and maintains yellow wavelength (587nm). The 10mcd output is lower than the LTL-4252's 19mcd, suitable only for applications where reduced brightness is acceptable. The 85° viewing angle provides maximum light distribution. Height of 4.60mm is 1.95mm shorter than the LTL-4252, offering space advantages in compact designs. MSL 1 (Unlimited) rating and ROHS3 compliance are maintained. Inventory is limited (2,569 units).

HLMP-Y402-G0000 (Broadcom Limited): This part deviates from primary compatibility criteria with orange wavelength (605nm) and elevated test current (20mA). Selection is restricted to applications where color specification permits orange operation and circuit design accommodates 20mA current. The 29mcd output and 45° viewing angle provide enhanced brightness and distribution. ROHS3 and MSL 1 compliance are maintained. Inventory is highest among all options (55,742 units).

Frequently Asked Questions (FAQ)

Q: Can HLMP-1420 or HLMP-1421 directly replace LTL-4252 without circuit modification?

A: Both parts operate at 2.0V forward voltage versus the LTL-4252's 2.1V. This 0.1V difference is within typical LED tolerance ranges and does not require circuit redesign for standard indication applications. Current-limiting resistor values may require minor adjustment if precise brightness matching is required. Both parts maintain 10mA test current compatibility.

Q: What is the impact of the viewing angle difference between LTL-4252 (20°) and substitute parts (45° to 85°)?

A: Narrower viewing angles (20°) concentrate light output in a focused beam, while wider angles (45° to 85°) distribute light across a broader area. Substitution with wider-angle parts increases visibility from off-axis positions but may reduce peak brightness perception when viewed directly. Application requirements determine acceptability.

Q: Is SLR-332YC3F suitable for high-brightness indication applications?

A: The SLR-332YC3F delivers 10mcd output, which is 47% lower than the LTL-4252's 19mcd. This part is suitable only for applications where reduced brightness is acceptable or where the 85° viewing angle provides sufficient visibility through distributed light output.

Q: Can HLMP-Y402-G0000 be used in place of LTL-4252?

A: HLMP-Y402-G0000 is an orange LED (605nm) operating at 20mA test current, differing from the LTL-4252's yellow specification (588nm) and 10mA current. Substitution is limited to applications where color specification permits orange operation and the circuit design accommodates 20mA current draw.

Q: What are the moisture sensitivity implications of switching from LTL-4252 (MSL 2A) to substitute parts (MSL 1)?

A: MSL 1 (Unlimited) rating indicates superior moisture resistance compared to MSL 2A (4 Weeks). Substitute parts with MSL 1 rating provide extended shelf life and reduced risk of moisture-induced failures during storage and handling. This represents an improvement over the LTL-4252 specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (HLMP-1420, HLMP-1421, SLR-332YC3F, and HLMP-Y402-G0000) are ROHS3 compliant, matching the LTL-4252's environmental compliance status.

Q: What is the height consideration for PCB layout compatibility?

A: The LTL-4252 has a maximum height of 6.55mm. Substitute parts range from 4.60mm (SLR-332YC3F) to 6.35mm (HLMP-1420, HLMP-1421). All parts fit within standard through-hole PCB clearance specifications. The SLR-332YC3F offers 1.95mm height reduction, beneficial for space-constrained designs.