PRECISION SHUNT VOLTAGE
REFERENCE
SC4040
PRELIMINARY - April 13, 1998
ELECTRICAL CHARACTERISTICS
TA = 25°C unless otherwise specified.
SC4040A (0.1%)
SC4040B (0.2%)
TYP
Parameter
Symbol
Condition
TA = 25°C
MIN
TYP
MAX MIN
MAX
UNITS
Reverse Breakdown Volt-
age
VZ
IZ = 100µA
2.4975 2.5000 2.5025 2.495 2.500 2.505
2.481 2.500 2.519 2.479 2.500 2.521
V
TA = -40 to +85°C
V
Minimum Operating Cur-
rent
IZ(min)
60
80
60
80
µA
Reverse Breakdown Volt-
age Temperature Coeffi-
cient
IZ = 10mA
IZ = 1mA
IZ = 100µA
∆VZ
∆T
TA = -40 to +85°C
TA = 25°C
±100
0.8
±100 ppm/°C
Ratio of Change in VZ to
Change in IZ
IZ(min) < IZ < 1mA
0.8
mV
∆
V
Z
∆IZ
TA = -40 to +85°C
1.0
6.0
8.0
0.8
1.0
6.0
8.0
0.8
mV
mV
mV
Ω
1mA < IZ < 12mA TA = 25°C
TA = -40 to +85°C
Reverse Dynamic
Impedance
ZR
eN
IZ = 1mA, f = 120 Hz, IAC = 0.1 IZ
0.25
35
0.25
35
Wideband Noise (RMS)
IZ = 100µA
µV
10Hz < f < 10kHz
Long Term Stability of Re-
verse Breakdown Voltage
t = 1000 hours
T = 25°C ± 0.1°C
IZ = 100µA
∆VZ
120
120
ppm
TA = 25°C unless otherwise specified.
SC4040C (0.5%)
MIN TYP MAX
SC4040D (1.0%)
MIN TYP MAX UNITS
Parameter
Symbol
Condition
Reverse Breakdown Volt-
age
VZ
IZ = 100µA
TA = 25°C
2.488 2.500 2.512 2.475 2.500
2.471 2.500 2.529 2.451 2.500
2.525
V
TA = -40 to +85°C
2.549
80
V
Minimum Operating Current
IZ(min)
60
80
60
µA
Reverse Breakdown Volt-
age Temperature Coeffi-
cient
IZ = 10mA
IZ = 1mA
IZ = 100µA
∆VZ
∆T
TA = -40 to +85°C
TA = 25°C
±100
0.8
±150
1.0
ppm/°C
mV
Ratio of Change in VZ to
Change in IZ
IZ(min) < IZ < 1mA
∆VZ
∆IZ
TA = -40 to +85°C
1.0
6.0
8.0
0.9
1.2
8.0
mV
mV
mV
Ω
1mA < IZ < 12mA TA = 25°C
TA = -40 to +85°C
10.0
1.1
Reverse Dynamic
Impedance
ZR
eN
IZ = 1mA, f = 120 Hz, IAC = 0.1 IZ
0.25
20
0.25
35
Wideband Noise (RMS)
IZ = 100µA
µV
10Hz < f < 10kHz
Long Term Stability of Re-
verse Breakdown Voltage
t = 1000 hours
T = 25°C ± 0.1°C
IZ = 100µA
∆VZ
120
120
ppm
3
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