Application Notes
Introduction
Kingbright AA3528AVU series are surface-mounted right-angle light-emitting diode (LED) circuit-
board indicators. It offers the convenience of surface-mount production while offering the right-angle
height profile of circuit-board indicator lamps. The part is suitable for automated SMT and lead-free
reflow soldering production. The clear silicone lens extends out to provide broad viewing angles.
When installed on customer’s circuit board, it can provide illuminated indication or backlight panel
indicators.
Transport and Storage
Surface mount devices (SMD) are moisture sensitive components. atmospheric moisture will seep
into the component package, so when placed on the circuit board for 160-200°C reflow soldering,
the high temperatures cause the absorbed moisture to vaporize and rapidly expand, creating vapor
pressure that could damage the LED component by causing cracks in the lens, delamination of the
chip and wire bonds, or other reliability issues.
1. Transportation
The product is packed in anti-static, moisture-proof mylar bags. The package should be carefully
handled to avoid external pressure and accidental puncture during transport.Proper anti-static
practices should be in place. If package leakage or damage is found before opening, suggest
customer take the damaged package off-line for additional testing and bake to dry before use.
2. Storage Conditions (Before Opening)
To prevent moisture-absorption reliability issues, the parts must be properly stored. Suggest do
not open the moisture-proof package until immediately before usage (except for sample inspection
purposes).The opened package must be re-sealed with fresh desiccant and humidity indicator and
Stored in a dry box (<30℃/60% RH).
3. Humidity Control (After Opening)
After opening the moisture-proof packaging, immediately check the humidity indicator card contained
inside to confirm the parts have been exposed to excess moisture.The production environment should
follow IPC/JEDEC J-STD-020 standards for temperature,humidity, and exposure time.
SMD environmental exposure time accumulates as long as the parts are outside the packaging,
unless they are being baked dry.
Table 1: IPC/JEDEC J-STD-020 Moisture Sensitivity Levels (MSL)
Allowed Exposure After Opening
MSL
Time
Conditions
LEVEL 1
LEVEL 2
LEVEL 2a
LEVEL 3
LEVEL 4
LEVEL 5
LEVEL 5a
LEVEL 6
No Limit
≦30℃/85%RH
≦30℃/60%RH
≦30℃/60%RH
≦30℃/60%RH
≦30℃/60%RH
≦30℃/60%RH
≦30℃/60%RH
≦30℃/60%RH
1 Year
4 Weeks
168 Hours
72 Hours
48 Hours
24 Hours
Immediately upon open
4. Storage of Unused And Remaining Parts
If the full reel was not consumed during production, the production environment was within limits
(<30℃/60% RH), and the exposure time did not exceed the limits in Table 1, then the remaining
parts may be stored as below:
z Re-sealed with desiccant.
z Stored within a dry box (5% RH). The dry box storage time would not count against the
total exposure time. When the stored parts are taken out, the exposure time is accu-
mulated from the previous production run.
SPEC NO: DSAN3491
APPROVED: Wynec
REV NO: V.4B
DATE: SEP/22/2016
DRAWN: W.Q.Zhong
PAGE: 6 OF 7
CHECKED: Allen Liu
ERP: 1102015727
KINGBRIGHT [ KINGBRIGHT CORPORATION ]
