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SANKEN ELECTRIC CO., LTD.

STR3A150-DS

July 20, 2012

PWM Off-Line Switching Regulator ICs

STR3A151, STR3A152, STR3A153,

STR3A154, STR3A155

Because reliability can be affected adversely by improper storage

environments and handling methods, please observe the following

cautions.

Cautions for Storage

•

Ensure that storage conditions comply with the standard

temperature (5°C to 35°C) and the standard relative humidity

(around 40% to 75%); avoid storage locations that experience

extreme changes in temperature or humidity.

•

Avoid locations where dust or harmful gases are present and

avoid direct sunlight.

•

Reinspect for rust on leads and solderability of the products that

have been stored for a long time.

Cautions for Testing and Handling

When tests are carried out during inspection testing and other

standard test periods, protect the products from power surges

from the testing device, shorts between the product pins, and

wrong connections. Ensure all test parameters are within the

ratings specified by Sanken for the products.

Remarks About Using Silicone Grease with a Heatsink

•

When silicone grease is used in mounting the products on a

heatsink, it shall be applied evenly and thinly. If more silicone

grease than required is applied, it may produce excess stress.

•

Volatile-type silicone greases may crack after long periods of

time, resulting in reduced heat radiation effect. Silicone greases

with low consistency (hard grease) may cause cracks in the mold

resin when screwing the products to a heatsink.

Our recommended silicone greases for heat radiation purposes,

which will not cause any adverse effect on the product life, are

indicated below:

Type

Suppliers

G746

Shin-Etsu Chemical Co., Ltd.

YG6260

Momentive Performance Materials Inc.

SC102

Dow Corning Toray Co., Ltd.

Soldering

•

When soldering the products, please be sure to minimize the

working time, within the following limits:

260±5°C

10±1 s

(Flow, 2 times)

380±10°C 3.5±0.5 s (Soldering iron, 1 time)

•

Soldering should be at a distance of at least 1.5 mm from the

body of the products.

Electrostatic Discharge

•

When handling the products, the operator must be grounded.

Grounded wrist straps worn should have at least 1 MΩ of

resistance from the operator to ground to prevent shock hazard,

and it should be placed near the operator.

•

Workbenches where the products are handled should be

grounded and be provided with conductive table and floor mats.

•

When using measuring equipment such as a curve tracer, the

equipment should be grounded.

•

When soldering the products, the head of soldering irons or the

solder bath must be grounded in order to prevent leak voltages

generated by them from being applied to the products.

•

The products should always be stored and transported in Sanken

shipping containers or conductive containers, or be wrapped in

aluminum foil.