DEVICE DESCRIPTION
The ZRC250 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 2.5 volts. The device is available
in a small outline surface mount package,
ideal for applications where space saving is
important, as well as a package for through
hole requirements.
The ZRC250 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRC250 is
recommended for operation between 20µA
and 5mA and so is ideally suited to low
power and battery powered applications.
Excellent performance is maintained to an
absolute maximum of 25mA, however the
rugged design and 20 volt processing allows
the reference to withstand transient effects
and currents up to 200mA. Superior
switching capability allows the device to
reach stable operating conditions in only a
few microseconds.
FEATURES
•Small outline SOT23 package
•TO92 style packages
•No stabilising capacitor required
•Low knee current, 15µA typical
•Typical TC 30ppm/°C
•Typical slope resistance 0.4Ω
•± 3, 2 and 1% tolerance
•Industrial temperature range
•Operating current 20µA to 5mA
•Transient response, stable in less than
10µs
•Optional extended current range
APPLICATIONS
•Battery powered and portable
equipment.
•Instrumentation.
•Test equipment.
VR
Gnd
PRECISION 2.5 VOLT LOW KNEE CURRENT
VOLTAGE REFERENCE
ISSUE 4 - JANUARY 2003
ZRC250
SCHEMATIC DIAGRAM
4-247
ABSOLUTE MAXIMUM RATING
Reverse Current 25mA
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
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb
=25°C
SYMBOL PARAMETER CONDITIONS LIMITS TOL% UNITS
MIN TYP MAX
VRReverse Breakdown Voltage IR=150µA2.475
2.45
2.425
2.5
2.5
2.5
2.525
2.55
2.575
1
2
3
V
IMIN Minimum Operating Current 13 20 µA
IRRecommended Operating
Current
0.02 5 mA
TC † Average Reverse
Breakdown Voltage Temp.
Co.
IR(min) to
IR(max)
30 90 ppm/°C
RS § Slope Resistance 0.4 1 Ω
ZRReverse Dynamic Impedance IR =1mA
f = 100Hz
IAC=0.1 I
R
0.3 0.8 Ω
ENWideband Noise Voltage IR=150µA
f=10Hz to
10kHz
60
µV(rms)
ReverseCurrent(µA)
Reverse Characteristics
Reverse Voltage (V)
01.0 2.0 3.0
TA=25°C
0
10
20
30
40
ZRC250
† 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)
4-248
ZRC250
-40 -20 0 20 40 60 80
2.47
2.48
2.49
2.50
2.51
0.1 1 10 100
0.2
0.4
0.6
0.8
1.0
1.2
1.4
10 100 1K 10K 100K
1
10
100
1000
04 812 16
0
1
2
0
10
04 812 16
0
10
2
1
0
TYPICAL CHARACTERISTICS
Transient Response - Single pulse Transient Response - Repetitive Test
Temperature (°C)
Reference Current (mA)
Temperature Drift
Slope Resistance v Current
Referencevoltage(V)
Sloperesistance(Ω)
Time (µs)
Slope Resistance v Frequency
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.001 0.01 0.1 110 100
ForwardVoltage(V)
Forward Characteristics
Forward Current (mA)
Time ( µs)
Sloperesistance(Ω)
V
IN
(V)
V
R
(V)
Frequency (kHz)
V
IN
(V)
V
R
(V)
IR=150µA to 5mA
IR=150µA
IR=1mA
IR=5mA
IR=5mA
IR=150µA
IR=5mA
IR=150µA
3
85°C
25°C
-40°C
≈≈
4-249
CONNECTION DIAGRAMS
E-Line, 3 pin Package Suffix – A
Bottom View –
Pin 1 floating or connected to pin 3
SOT23 Package Suffix – F
Top View –
Pin 1 floating or connected to pin 2
ZRC250
4-250
Part No Tol% Package Partmark
ZRC250A03 3 E-Line •ZRC25003
ZRC250A02 2 E-Line •ZRC25002
ZRC250A01 1 E-Line •ZRC25001
ZRC250F03 3 SOT23 25G
ZRC250F02 2 SOT23 25H
ZRC250F01 1 SOT23 25J
• E-Line 3 pin
ORDERING INFORMATION
ZRC250
4-251
