Is there a pin-compatible replacement for SZYY0603B?

Several blue LEDs exist in the same 0603 package, such as NCD0603B1. While form-fit compatible, they are not guaranteed pin-to-pin replacements without verifying key electrical parameters like luminous intensity at the application's drive current.

What risks should I check before replacing SZYY0603B?

When replacing the SZYY0603B, the main risks are mismatched luminous intensity (brightness) due to different test currents, a different forward voltage affecting the drive circuit, and a narrower operating temperature range. Always verify the candidate part in the actual application.

SZYY0603B Alternatives, Datasheet & Cross Reference | Shenzhen Yongyu Optoelectronics Co., Ltd.

The SZYY0603B is a standard blue LED in a 0603 package, commonly used for indication. Finding a direct replacement requires matching color, brightness, and forward voltage at the specified 10mA test current.

AI replacement insight

Electrical riskmedium

Forward voltage is similar, but test current and resulting brightness differ.

Package risklow

All viable candidates use the standard 0603 package.

Can it be replaced directly?

No direct, verified drop-in replacement has been identified. The closest candidates require engineering review due to differences in test current and operating temperature.

Best replacement path

Consider NCD0603B1 as a functional alternative, but verify brightness at 10mA.

Main risk

The primary risk is a mismatch in luminous intensity, as candidates are often specified at a different test current (e.g., 20mA) than the target's 10mA.

Recommended alternatives

Alternatives are being enriched. Analyze this part in PartGenie for the latest matches.

Alternative comparison matrix

Feature / factor	SZYY0603B	NCD0603B1	NCD0603B4	Compatibility / risk
Package	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric) — Package size matches.; NCD0603B4: Package size matches.
Color	Blue	Blue	Blue	Blue — Color matches.; NCD0603B4: Color matches.
Wavelength	460 - 475 nm	468 nm	-	468 nm — Within target range.
Current	10 mA	20 mA	20 mA	20 mA — Test current is higher, brightness may differ at 10mA.; NCD0603B4: Test current is higher.
Temperature	-40°C to +85°C	-30°C to +85°C	-30°C to +85°C	-30°C to +85°C — Narrower operating temperature range.; NCD0603B4: Narrower operating temperature range.
Luminous Intensity	70 - 175 mcd	-	50 mcd	50 mcd — Significantly dimmer than target.

Application & sourcing insights

Questions & answers

The NCD0603B1 from NationStar is a close functional alternative, matching the package, color, and voltage. However, its brightness is specified at 20mA, not 10mA like the target, so its performance in-circuit must be verified.