DA108S1 - STMICROELECTRONICS

January 2008 Rev 6 1/8

DA108S1

DA112S1

Diode array

Features

■Array of 8 or 12 diodes

■Low input capacitance

■Suitable for digital line protection

Complies with following standards:

■IEC 61000-4-2 Level 4

– 15kV (air discharge)

– 8kV (contact discharge)

Applications

■Protection of logic side of ISDN S-interface

■Protection of I/O lines of microcontroller

■Signal conditioning

Description

Array of 8 or 12 diodes configured by cells of 2

diodes, each cell being used to protect signal line

from transient overvoltages by clamping action.

As maximum voltage of each diode is 18 V,

maximum input voltage range between two I/Os is

either 0 V to 18 V (REF1 = 0 V and REF2 =

+18 V) or -9 V to +9 V (REF1 = -9 V and REF2 =

+9 V)

Figure 1. Functional diagram: DA108S1

Figure 2. Functional diagram: DA112S1

SO-8

I/O1 REF1

REF2

REF3

REF4

I/O2

I/O3

I/O4

I/O1 18

REF1

I/O6

REF2

I/O5

I/O2

I/O3

I/O4

www.st.com

Characteristics DA108S1 / DA112S1

2/8

1 Characteristics

Table 1. Absolute maximum ratings (Tamb = 25 °C)

Symbol Parameter Value Unit

VRRM Repetitive peak reverse voltage (for one single diode) 18 V

IPP Repetitive peak forward current (1) tp = 8/20 µs 12 A

P Power dissipation 0.73 W

Tstg Storage temperature range -55 to +150 °C

TjOperating junction temperature range -55 to +150 °C

TLMaximum lead temperature for soldering during 10 s. 260 °C

1. The surge is repeated after the device returns to ambient temperature

Table 2. Thermal resistance

Symbol Parameter Value Unit

Rth (j-a) Junction to ambient 170 °C/W

Table 3. Electrical characteristics(Tamb = 25 °C)

Symbol Parameter Max. Unit

VFP Peak forward voltage IPP = 12 A,

tp = 8/20 µs

DA108S1 9 V

DA112S1 12

VFForward voltage IF = 50 mA 1.2 V

IRReverse leakage current VR = 15 V 2 µA

DA108S1 / DA112S1 Characteristics

3/8

Figure 3. Input capacitance

Figure 4. Typical peak forward voltage characteristics (8/20 µs pulse)

2468101214160

C (pF)

I/O

VCC

REF2

REF1

DC bias (V)

V = 5 V

V = 15 V

Typical values

V connected between REF1 and REF2

Input applied :

DC bias + 950 mV at 1 MHZ

(RMS)

(V)

0.001 0.01 0.1 1

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

Tj = 25 C

(A)

Typical values

(V)

110

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

Typical values

(A)

Tj = 25 C

Characteristics DA108S1 / DA112S1

4/8

Figure 5. Application 1: ISDN interface protection, residual lightning surges at

transformer secondary are suppressed by DA108S1

Figure 6. Application 2: microcontroller I/O port protection

Note: IMPORTANT : DA108S1 must be connected to the reference voltages through REF1 and

REF2.

GND

TPIxx

LINE SIDE

LOGIC SIDE

DA1x S1x

Vcc

Vss

DA1x S1x

4-6 bit input port

Vcc

I/O

μc

DA108S1 / DA112S1 Ordering information scheme

5/8

2 Ordering information scheme

Figure 7. Ordering information scheme

DA 1 08 S 1 RL

Diode Array

Version

Packaging

08 = 12

12 = 12

1 = SO-8

Number of diodes

Serial

Package

RL = Tape and reel

Blank = Tube

Package mechanical data DA108S1 / DA112S1

6/8

3 Package mechanical data

●Epoxy meets UL94, V0

In order to meet environmental requirements, ST offers these devices in ECOPACK®

packages. These packages have a lead-free second level interconnect. The category of

second level interconnect is marked on the package and on the inner box label, in

compliance with JEDEC Standard JESD97. The maximum ratings related to soldering

conditions are also marked on the inner box label. ECOPACK is an ST trademark.

ECOPACK specifications are available at www.st.com.

Figure 8. SO-8 footprint dimensions in mm (inches)

Table 4. SO-8 dimensions

Ref.

Dimensions

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A1.750.069

A1 0.1 0.25 0.004 0.010

A2 1.25 0.049

b 0.28 0.48 0.011 0.019

C 0.17 0.23 0.007 0.009

D 4.80 4.90 5.00 0.189 0.193 0.197

E 5.80 6.00 6.20 0.228 0.236 0.244

E1 3.80 3.90 4.00 0.150 0.154 0.157

e 1.27 0.050

h 0.25 0.50 0.010 0.020

L 0.40 1.27 0.016 0.050

L1 1.04 0.041

k°0808

ccc 0.10 0.004

bA1

ccc C

h x 45°

(Seating

Plane) 0.25mm

(Gage Plane)

6.8

(0.268)

4.2

(0.165)

1.27

(0.050)

0.6

(0.024)

DA108S1 / DA112S1 Ordering information

7/8

4 Ordering information

Figure 9. Ordering information

5 Revision history

Figure 10. Revision history

Order codes Marking Package Weight Base qty Delivery mode

DA108S1 DA108S

SO-8 0.11 g

100 Tube

DA108S1RL 2500 Tape and reel(1)

1. Prefered packaging is tape and reel

DA112S1 DA112S 100 Tube

DA112S1RL 2500 Tape and reel(1)

Date Revision Changes

Aug-2001 4Previous release.

15-Feb-2007 5Reformatted to current standard.

Standard typing error corrected.

15-Jan-2008 6

Reformatted to current standards. Added paragraph on maximum

input voltage range to Description. Parameters updated in Table 1 .

Added Pin 1 marker to package illustration. Added Figure 8: SO-8

footprint dimensions in mm (inches).

DA108S1 / DA112S1

8/8

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