DEVICE DESCRIPTION
The ZR4040-2.5 uses a bandgap circuit
design to achieve a precision micropower
voltage reference of 2.5 volts. The device is
available in small outline surface mount
packages, ideal for applications where space
saving is important, as well as packages for
through hole requirements.
The ZR4040-2.5 design provides a stable
voltage without an external capacitor and is
stable with capacitive loads. The ZR4040-2.5
is recommended for operation between
60µA and 15mA 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 SO8 and SOT23 packages
•TO92 style package
•No stabilising capacitor required
•Typical TC 30ppm/°C
•Typical slope resistance 0.4Ω
• 2% 1% and 0.5 % tolerance
•Industrial temperature range
•Operating current 60µA to 15mA
•Transient response, stable in less than
10µs
APPLICATIONS
•Battery powered and portable
equipment.
•Metering and measurement systems.
•Instrumentation.
•Test equipment.
•Data acquisition systems.
•Precision power supplies.
V R
G nd
PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 3 - MARCH 1998
SCHEMETIC DIAGRAM
ZR4040-2.5
4-173
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
SYMBOL PARAMETER CONDITIONS LIMITS TOL.
% UNITS
MIN TYP MAX
VRReverse Breakdown Voltage IR=150µA2.4875
2.475
2.45
2.5
2.5
2.5
2.5125
2.525
2.55
0.5
1
2
V
IMIN Minimum Operating Current 25 60 µA
IRRecommended Operating
Current
0.06 15 mA
TC † Average Reverse
Breakdown Voltage Temp.
Co.
IR(min) to
IR(max)
30 100 ppm/°C
RS § Slope Resistance 0.4 2 Ω
ZRReverse Dynamic Impedance IR =1mA
f = 100Hz
IAC=0.1 IR
0.3 0.8 Ω
ENWideband Noise Voltage IR= 1mA
f = 10Hz to
10kHz
45 µV
(rms)
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
SO8 625mW
E-Line, 3 pin (TO92) 500mW
ZR4040-2.5
0
Reverse Characteristics
Reverse Voltage (V)
Reverse Current (µA)
0.2 0.6
10
20
30
40
50
60
1.0 1.8 2.61.4 2.2
T
A
=25°C
T
A
=85°C
T
A
=-40°C
†
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
)
4-174
V
IN
- (V) V
R
- (V)
Transient Response (IR=150µµA)
V
IN
- (V) V
R
- (V)
2.50
2.49
2.48
2.47
2.53
2.52
2.51
TYPICAL CH AR ACTERISTICS
Forward Voltage (V)
Temperature (°C)
Reference Current (mA) Frequency (kHz)
Temp erature Drift
Slope Resistance v Current
Reference voltage (V)
Slope resistance (Ω)
Time (µs)
012
-40
1100.1
Slope Resistance v Frequency
-20 0 20 40 60 80
Forward Characteristics
Forward Current (mA)
0.1 1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
10 100 1000
IR =150µA to 5mA
0
0.5
1.0
1
0.1
10
100
1000
10 10010.10.01
34
0
10
0
1.0
2.0
3.0
0
10
0
1.0
2.0
3.0
0 0.1 0.2 0.3 0.4
Time (µs)
INPUT INPUT
Slope resistance (Ω)
IR=150µA
IR=1mA
IR=5mA
TA=25°C
TA=-40°C
TA=85°C
50K
OUTPUT OUTPUT
1K5
Transient Response (IR=5mA)
ZR4040-2.5
4-175
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
Part Number Tol% Package Partmark
ZR40402F25 2 SOT23 25L
ZR40401F25 1 SOT23 25M
ZR404005F25 0.5 SOT23 25V
ZR40402N825 2 SO8 ZR4040225
ZR40401N825 1 SO8 ZR4040125
ZR404005N825 0.5 SO8 ZR4040525
ZR40402R25 2 E-Line * ZR4040225
ZR40401R25 1 E-Line * ZR4040125
ZR404005R25 0.5 E-Line * ZR4040525
* E-Line, 3 pin Reversed
ZR4040-2.5
CONNECTION DIAGRAMS
ORDERING INFORMATION
4-176
