DEVICE DESCRIPTION
The ZRA245 uses a bandgap circuit design
to achieve a precision voltage reference of
2.45 volts. The device is available in small
outline surface mount packages, ideal for
applications where space saving is
important.
The ZRA245 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRA245 is
recommended for operation between 2mA
and 120mA.
FEATURES
•Small outline SOT23, SO8 and TO92
style package
•No stabilising capacitor required
•Typical TC 15ppm/°C
•Typical slope resistance 0.26Ω
•± 3% , 2% and 1% tolerance
•Industrial temperature range
•Operating current 2mA to 120mA
APPLICATIONS
•Battery powered and portable
equipment.
•Metering and measurement systems.
• Instrumentation.
•Test equipment.
•Data acquisition systems.
•Precision power supplies.
PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 3 — MARCH 1998
ZRA245
VR
Gnd
1.25VREF
SCHEMATIC DIAGRAM
4-227
ABSOLUTE MAXIMUM RATING
Reverse Current 200mA
Forward Current 25mA
Operating Temperature -40 to 85°C
Storage Temperature -55 to 125°C
Power Dissipation (Tamb=25°C)
SOT23 330mW
E-Line, 3 pin (TO92) 500mW
E-Line, 2 pin (TO92) 500mW
SO8 625mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
SYMBOL PARAMETER CONDITIONS LIMITS TOL.
% UNITS
MIN TYP MAX
VRReverse Breakdown Voltage IR=5mA 2.43
2.40
2.38
2.45
2.45
2.45
2.47
2.50
2.52
1
2
3
V
IMIN Minimum Operating Current 2 mA
IRRecommended Operating
Current
2 120 mA
TC † Average Reverse Breakdown
Voltage Temp. Co. IR(min) to
IR(max)
15 50 ppm/°C
RS § Slope Resistance 0.26 0.5 Ω
ZRReverse Dynamic Impedance IR =5mA
f = 100Hz
IAC=0.1 IR
0.28 1 Ω
ENWideband Noise Voltage IR= 5mA
f = 10Hz to
10kHz
65 µV(rms)
ZRA245
†
T
C
= (
V
R
(
max
)−
V
R
(
min
))
x
1000000
V
R
x
(
T
(
max
)−
T
(
min
))
Note: VR(max) - VR(min) is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
§
R
S
=
V
R
Change
(
I
R
(
min
)
to
I
R
(
max
))
I
R
(
max
) −
I
R
(
min
)
4-228
V
IN
- (V) V
R
- (V)
Transient Response
2.44
2.43
2.46
2.45
TY PIC A L CHA R ACTERIST ICS
Forward Voltage (V)
Temperature (°C)
Reference Current (mA) Frequency (KHz)
Temperature Drift
Slop e Re s ist ance v Cur ren t
Reference voltage (V)
Slope resistance (Ω)
Time (µs)
0510
-40
10 1001
Slope Resistance v Frequency
-20 0 20 40 60 80
Forward Characteristics
Forward Current (mA)
0.4
0.6
0.8
1.0
1.2
1.4
1 10 100 1000
0.1
1
10
100
10 10010.10.01
15 20
0
10
0
1.0
2.0
3.0
Slope resistance (Ω)
IR=2mA
IR=5mA
IR=20mA
TA=-40°C
1.6
0
0.4
0.2
0.6
TA=25°C
TA=85°C
VIN
VR
0.36K
20mA
3K6
2mA
20mA
2mA
Reverse Current (mA)
0
Reverse Characteristics
Reverse Voltage (V)
0
2.0
4.0
1.0 2.0 3.0
TA=25°C
ZRA245
4-229
SO8 Package Suffix – N8
Top View
SOT23 Package Suffix – F
Top View –
Pin 1 floating or connected to pin 2
E-Line, 3 pin,Rev Package Suffix – R
Bottom View –
Pin 3 floating or connected to pin 1
E-Line, 2 pin Package Suffix – Y
Bottom View
CONNECTION DIAGRAMS
ZRA245
E-Line, 3 pin Package Suffix – A
Bottom View –
Pin 1 floating or connected to pin 3
4-230
Part No Tol% Package Partmark
ZRA245A03 3 E-Line •ZRA24503
ZRA245A02 2 E-Line •ZRA24502
ZRA245A01 1 E-Line •ZRA24501
ZRA245F03 3 SOT23 24A
ZRA245F02 2 SOT23 24B
ZRA245F01 1 SOT23 24C
ZRA245N803 3 SO8 ZRA24503
ZRA245N802 2 SO8 ZRA24502
ZRA245N801 1 SO8 ZRA24501
Part No Tol% Package Partmark
ZRA245R03 3 E-Line * ZRA245R3
ZRA245R02 2 E-Line * ZRA245R2
ZRA245R01 1 E-Line * ZRA245R1
ZRA245Y03 3 E-Line † ZRA24503
ZRA245Y02 2 E-Line † ZRA24502
ZRA245Y01 1 E-Line † ZRA24501
* E-Line 3 pin Reversed
† E-Line 2 pin
• E-Line 3 pin
ORDERING INFORMATION
ZRA245
4-231
