Is there a pin-compatible replacement for LTST-C191TBKT?

Several 0603 package LEDs like Kingbright APG1608QBC/D and LITEON LTST-C191TBKT-5A are form-fit compatible. True pin-to-pin electrical compatibility depends on parameters like forward voltage and current, which must be verified for your specific application.

What risks should I check before replacing LTST-C191TBKT?

The main risks are electrical mismatches. Check the candidate's forward voltage (Vf) to ensure it's within your driver's range, and verify the forward current (If) and luminous intensity to meet brightness requirements. Also, confirm the package dimensions are identical.

LTST-C191TBKT Alternatives, Datasheet & Cross Reference | LITEON

The LITEON LTST-C191TBKT is a standard 0603 blue LED. Several alternatives exist from Kingbright and Würth Elektronik in the same package, but key electrical parameters like forward current and voltage must be carefully verified before substitution.

AI replacement insight

Electrical riskhigh

Several candidates have unverified or different forward current ratings.

Package risklow

Most viable candidates use the same 0603 package.

Firmware risklow

Not applicable for a discrete LED.

Can it be replaced directly?

No verified direct drop-in replacement has been identified. The closest candidates require engineering review of their datasheets to confirm electrical compatibility.

Best replacement path

The most promising path is to evaluate Kingbright's APG1608QBC/D, which matches on most key parameters but requires datasheet verification of its forward current.

Main risk

The primary risk is electrical incompatibility, specifically a mismatch in forward current (If), which can lead to incorrect brightness or damage to the LED or driver circuit.

Recommended alternatives

A same-series variant from LITEON in the same 0603 package, but specified for a lower 5mA forward current.

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Alternative comparison matrix

Feature / factor	LTST-C191TBKT	LTST-C191TBKT-5A	APG1608QBC/D	150060BS75003	Compatibility / risk
Package	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 metric)	0603 (1608 Metric)	0603 (1608 Metric) / 0603 (1608 metric) — Package size matches.; APG1608QBC/D: Package size matches.; 150060BS75003: Package size matches.
Current	20 mA	5 mA	unknown	unknown	5 mA / unknown — Significantly lower test current, will result in lower brightness.; APG1608QBC/D: Forward current test condition not specified.; 150060BS75003: Forward current not specified.
Voltage	2.8 - 3.8 V	2.8 V (Typ)	3.3V (typ)	unknown	2.8 V (Typ) / 3.3V (typ) / unknown — Typical forward voltage matches.; APG1608QBC/D: Forward voltage is within target range.; 150060BS75003: Forward voltage not specified.
Luminous Intensity	28 - 180 mcd	15.0 mcd (Typ)	70mcd	350mcd	15.0 mcd (Typ) / 70mcd / 350mcd — Lower brightness due to lower test current.; APG1608QBC/D: Brightness is within target range.; 150060BS75003: Significantly brighter than target.

Application & sourcing insights

Questions & answers

Kingbright's APG1608QBC/D appears to be a strong functional alternative, sharing the same 0603 package, blue color, and similar brightness. However, you must verify its forward current from the datasheet to ensure compatibility with your circuit's drive current.