Obsolescence Notice
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V
A
mA
ppm/
C
ppm/
C
V
ms
ms
ms
ms
1.230
1.5
80
40
40
10
7
24
0.4
1.8
V
REF
R
REF
I
ON
I
REF
TCV
REF
E
N
t
ON
t
OFF
t
ON
t
OFF
SR12D
1.2V PRECISION VOLTAGE REFERENCE
The SR12D is a monolithic integrated circuit using the
bandgap principle to provide a precise reference voltage of
1.23V.
This reference device is packaged in a standard SOT-23
small outline package, making it ideal for all surface mount
applications.
DS2442 - 2.2
FEATURES
s
Standard SOT-23 Surface Mount Package
s
Low Knee Current - Typically 80
A
s
Low temperature Coefficient
SOT-23
Fig. 1 Pin connections (top view)
Fig.2 SR12D circuit diagram
Fig.3 SR12D external connections.
ABSOLUTE MAXIMUM RATINGS
Reference current
2.5mA
Operating temperature range
-40
C to + 85
C
Storage temperature range
-55
C to +125
C
I
REF
= 150
A to 2.5mA
0
C to +70
C
-40
C to + 85
C
1Hz to 25kHz
Output voltage
Slope resistance (see note 1)
Turn-on (knee) current
Recommended operating current range
Temperature coefficient (see note 2)
RMS noise voltage
Turn on time
Turn off time
Turn on time
Turn off time
Characteristic
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated):
T
amb
= +25
C, I
REF
= 150
A, C
S
= 1
F
1.193
0.09
Min.
Typ.
1.267
2.5
90
2.5
125
120
Value
Max.
Symbol
Units
Conditions
NOTE: In order to achieve optimum operation, an electrolytic
stabilising capacitor (C
S
> 1
F) should be connected between
V
REF
and 0V as shown in Fig. 3.
I
REF
= 5mA
SR12D
2
NOTES
1. Slope Resistance (R
REF
)
The slope resistance is defined as
R
REF
=
Change in V
REF
over specified current range
The change in reference current
2. Reference Voltage Temperature Coefficient (TCV
REF
)
This is the normalised reference voltage change over
temperature , divided by the change in temperature. It is
expressed in ppm/
C as follows:
TCV
REF
= ppm/
C
T = temperature change in
C
V
REF
= change in reference voltage over temperature
change
T.
V
REF
x 10
6
V
REF
x
T
Fig.5 SR12D typical response time (not to scale)
Fig.4 Typical reference characteristic
Fig.6 Typical temperature characteristic of SR12D at I
REF
= 150
A
SR12D
3
Fig.7 Derating curve
SR12D
4
HEADQUARTERS OPERATIONS
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire SN2 2QW, United Kingdom.
Tel: (0793) 518000
Fax: (0793) 518411
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017
1500 Green Hills Road,
Scotts Valley, California 95067-0017,
United States of America.
Tel: (408) 438 2900
Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES
FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax : (1) 64 46 06 07
GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55
ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510
NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA
Tel (408) 438 2900 Fax: (408) 438 7023.
Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061.
SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872
SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36
UK, EIRE, DENMARK, FINLAND & NORWAY
Swindon Tel: (0793) 518510 Fax : (0793) 518582
These are supported by Agents and Distributors in major countries world-wide.
GEC Plessey Semiconductors 1994 Publication No. DS2442 Issue No. 2.2 January 1994
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded
as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company
reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute
any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information
and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury
or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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