Richtek Technology Corporation

Headquarter

5F, No. 20, Taiyuen Street, Chupei City

Hsinchu, Taiwan, R.O.C.

Tel: (8863)5526789 Fax: (8863)5526611

Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit

design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be

guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.

22

DS9971-01 April 2011

www.richtek.com

RT9971

Richtek Technology Corporation

Taipei Office (Marketing)

5F, No. 95, Minchiuan Road, Hsintien City

Taipei County, Taiwan, R.O.C.

Tel: (8862)86672399 Fax: (8862)86672377

Email: marketing@richtek.com

Outline Dimension

Symbol

Dimensions In Millimeters

Dimensions In Inches

Min

Max

Min

Max

A

0.700

0.800

0.028

0.031

A1

0.000

0.050

0.000

0.002

A3

0.175

0.250

0.007

0.010

b

0.150

0.250

0.006

0.010

D

4.950

5.050

0.195

0.199

D2

3.250

3.500

0.128

0.138

E

4.950

5.050

0.195

0.199

E2

3.250

3.500

0.128

0.138

e

0.400

0.016

L

0.350

0.450

0.014

0.018

W-Type 40L QFN 5x5 Package

Note : The configuration of the Pin #1 identifier is optional,

but must be located within the zone indicated.

DETAIL A

Pin #1 ID and Tie Bar Mark Options

1

1

2

2

D

E

D2

E2

L

b

A

A1

A3

e

1

SEE DETAIL A