LNG401YKX Equivalent & Substitute Parts

Part Overview

The LNG401YKX is an amber LED indicator manufactured by Panasonic Electronic Components, designed for through-hole mounting in discrete indication applications. This part features a 5mm round lens with domed top, rated at 15mcd with a forward voltage of 2.2V at 20mA test current. The product is currently obsolete, making equivalent substitutes necessary for ongoing design requirements and production continuity.

Substiute Parts

LNG401YKX

Panasonic Electronic ComponentsIn Stock: 931LNG401YKX Datasheet

Current PartRFQ

LTL-4273

Lite-On Inc.In Stock: 6636LTL-4273 Datasheet

SimilarRFQ

Z-221A

JKL Components Corp.In Stock: 991Z-221A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LNG401YKX is determined by strict alignment of the following parameters:

• Color: Amber (all substitutes match)
• Lens Size: 5mm, T-1 3/4 (all substitutes match)
• Mounting Type: Through Hole Radial (all substitutes match)
• Lens Style: Round with Domed Top (all substitutes match)
• Forward Voltage Range: 2.1V–2.2V (acceptable operating range)
• Test Current: 10mA–20mA (within typical LED operating specifications)
• Millicandela Rating: 15mcd–20mcd (brightness within acceptable tolerance)
• Wavelength - Peak: 585nm–600nm (amber spectrum compliance)

Both LTL-4273 and Z-221A meet these substitution criteria. The LTL-4273 operates at lower test current (10mA vs. 20mA) with slightly higher brightness (19mcd), while Z-221A provides the highest brightness (20mcd) and widest viewing angle (120°).

Parameter Comparison

Engineering Selection Recommendations

LTL-4273 (Lite-On Inc.) is the preferred substitute for applications requiring regulatory compliance. This part is ROHS3 compliant and REACH affected, meeting modern environmental standards. It operates at lower test current (10mA) while delivering higher brightness (19mcd), reducing power consumption in the circuit. The diffused lens provides uniform light distribution across a 36° viewing angle. Height variance of 0.25mm is negligible for through-hole PCB applications.

Z-221A (JKL Components Corp.) is suitable for applications where maximum brightness and wide viewing angle are critical design requirements. This part delivers 20mcd brightness with a 120° viewing angle, providing superior light distribution in space-constrained or wide-angle indication scenarios. However, Z-221A is RoHS non-compliant and REACH unaffected, limiting its use in regulated markets. The increased height (9.60mm vs. 8.85mm) requires verification against PCB clearance constraints.

Both substitutes maintain electrical compatibility through forward voltage alignment (2.1V vs. 2.2V) and radial through-hole package equivalence. Circuit design should accommodate the lower test current specification of substitute parts if current-limiting resistor values were optimized for the original 20mA specification.

Frequently Asked Questions (FAQ)

Q: Can LTL-4273 or Z-221A be used as direct drop-in replacements for LNG401YKX?

A: Both parts are mechanically and electrically compatible as through-hole radial components with identical 5mm T-1 3/4 lens dimensions. PCB footprints and lead spacing are equivalent. However, verify height clearance, as Z-221A is 0.75mm taller than the original part.

Q: What is the impact of lower test current (10mA) in substitute parts?

A: Substitute parts are specified at 10mA test current versus the original 20mA. This reflects typical LED operation and does not indicate reduced performance. Circuit current-limiting resistors should be recalculated based on actual forward voltage (2.1V) and desired operating current for the application.

Q: How do the brightness ratings compare?

A: LNG401YKX is rated at 15mcd, LTL-4273 at 19mcd, and Z-221A at 20mcd. All three fall within acceptable brightness tolerance for amber indication applications. Higher brightness in substitutes may require resistor adjustment to prevent over-driving the LED.

Q: What is the difference between diffused and non-diffused lenses?

A: LTL-4273 and Z-221A feature diffused amber lenses, which scatter light for uniform distribution. The original LNG401YKX lens transparency is not specified. Diffused lenses reduce peak brightness in the direct viewing axis but improve visibility across wider angles.

Q: Are there compliance differences between the substitutes?

A: LTL-4273 is ROHS3 compliant and REACH affected, meeting EU environmental regulations. Z-221A is RoHS non-compliant and REACH unaffected. For applications in regulated markets or with environmental compliance requirements, LTL-4273 is the appropriate choice.

Q: How do viewing angles affect circuit design?

A: LTL-4273 provides 36° viewing angle, while Z-221A provides 120°. Wider viewing angles improve visibility from off-axis positions but may reduce peak brightness in the direct viewing direction. Select based on the intended mounting orientation and observer position in the application.