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PRECISION 2.45 VOLT VOLTAGE REFERENCE
ISSUE 3 -- MARCH 1998
ZRA245
FEATURES
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 a p pl i c a t i on s whe re s pac e s av i ng i s 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.
* * * * * * * * * * * * *
Small outline SOT23, SO8 and TO92 style package No stabilising capacitor required Typical TC 15ppm/C Typical slope resistance 0.26 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.
SCHEMATIC DIAGRAM
VR
1.25VREF
Gnd
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ZRA245
ABSOLUTE MAXIMUM RATING
Reverse Current Forward Current Operating Temperature Storage Temperature 200mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) SOT23 330mW E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C
SYMBOL PARAMETER CONDITIONS MIN VR Reverse Breakdown Voltage IR=5mA 2.43 2.40 2.38 LIMITS TYP MAX 2.45 2.47 2.45 2.50 2.45 2.52 2 2 120 1 2 3 V TOL. % UNITS
IMIN IR TC RS ZR
Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance
mA mA
15 IR(min) to IR(max) IR = 5mA f = 100Hz IAC= 0.1 IR IR = 5mA f = 10Hz to 10kHz
50
ppm/C
0.26 0.5 0.28 1
EN
Wideband Noise Voltage
65 V(rms)
TC =
(VR(max)-VR(min)) x 1000000
VR x (T(max)-T(min))
Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range.
RS =
VR Change(IR (min) to IR (max)) IR (max) - IR (min)
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ZRA245
TYPICAL CHARACTERISTICS
1.6 1.4 1.2 1.0 0.8 0.6 0.4 1 2.46
Reference voltage (V)
10 100 1000
Forward Voltage (V)
2.45
2.44
2.43 -40
-20
0
20
40
60
80
Forward Current (mA)
Temperature (C)
Forward Characteristics
Temperature Drift
100 0.6 TA=-40C
IR=2mA
Slope resistance ()
Slope resistance ()
0.4 TA=25C 0.2 TA=85C
10
IR=5mA
IR=20mA
1
0 1 10 100
0.1 0.01 0.1 1 10 100
Reference Current (mA)
Frequency (KHz)
Slope Resistance v Current
Slope Resistance v Frequency
3.0
20mA 2mA
3K6 2mA
4.0 TA=25C
VR - (V)
2.0
VIN
0.36K 20mA
1.0 0 10
VR
Reverse Current (mA)
2.0
VIN - (V)
0 0 5 10 15 20
0 0 1.0 2.0 3.0
Time (s)
Reverse Voltage (V)
Transient Response
Reverse Characteristics
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ZRA245
CONNECTION DIAGRAMS
E-Line, 2 pin Package Suffix - Y E-Line, 3 pin,Rev Package Suffix - R
Bottom View
Bottom View - Pin 3 floating or connected to pin 1
E-Line, 3 pin Package Suffix - A
SO8 Package Suffix - N8
Bottom View - Pin 1 floating or connected to pin 3
Top View
SOT23 Package Suffix - F
Top View - Pin 1 floating or connected to pin 2
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ZRA245
ORDERING INFORMATION
Part No ZRA245A03 ZRA245A02 ZRA245A01 ZRA245F03 ZRA245F02 ZRA245F01 ZRA245N803 ZRA245N802 ZRA245N801 Tol% Package 3 2 1 3 2 1 3 2 1 E-Line * E-Line * E-Line * SOT23 SOT23 SOT23 SO8 SO8 SO8 Partmark ZRA24503 ZRA24502 ZRA24501 24A 24B 24C ZRA24503 ZRA24502 ZRA24501 Part No ZRA245R03 ZRA245R02 ZRA245R01 ZRA245Y03 ZRA245Y02 ZRA245Y01 Tol% Package 3 2 1 3 2 1 E-Line * E-Line * E-Line * E-Line E-Line E-Line Partmark ZRA245R3 ZRA245R2 ZRA245R1 ZRA24503 ZRA24502 ZRA24501
* E-Line 3 pin Reversed E-Line 2 pin * E-Line 3 pin
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