A Product Line of
Diodes Incorporated
ZR285
PRECISION 2.5V MICROPOWER VOLTAGE REFERNCE
Description
The ZR285 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.
The ZR285 design provides a stable voltage without an
external capacitor and is stable with capacitive loads. The
ZR285 is recommended for operation between 20μA and
20mA and so is ideally suited to low power and battery
powered applications.
Excellent performance is maintained to an absolute
maximum of 30mA, 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.
Pin Assignment
(Top View)
Pin 1 floating or connected to pin 2
Features
•
•
•
•
•
•
•
•
Small outline SOT23 style package
No stabilizing capacitor required
Low knee current, 15μA typical
Typical T
C
30ppm/°C
Typical slope resistance 0.4Ω
± 2% tolerance
Industrial temperature range
Operating current 20μA to 20mA
Typical Application Circuit
Applications
•
•
•
•
•
•
Battery powered and portable equipment
Metering and measurement systems
Instrumentation
Test equipment
Data acquisition systems
Precision power supplies
ZR285
Document number: DS32168 Rev. 8 - 2
1 of 5
www.diodes.com
May 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
ZR285
Absolute Maximum Ratings
(Voltages to GND Unless Otherwise Stated)
Parameter
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
Power Dissipation (T
AMB
= 25°C)
SOT23
Rating
30
25
-40 to 85
-55 to 150
330
Unit
mA
mA
°C
°C
mW
Electrical Characteristics
Symbol
V
R
I
MIN
I
R
T
C
(*)
(†)
(Test conditions: Tamb = 25°C, unless otherwise specified.)
Parameter
Reverse breakdown voltage
Minimum operating current
Recommended operating current
Average reverse breakdown voltage
temperature coefficient
Slope resistance
Reverse dynamic impedance
Condition
I
R
= 150µA
Min.
2.45
0.02
Typ.
2.5
13
30
0.4
0.3
Max.
2.55
20
20
90
1
0.8
Tol. (%)
2
Unit
V
µA
mA
ppm/°C
Ω
Ω
R
S
Z
R
I
R
= 1mA to
20mA
I
R
= 1mA
f = 100Hz
I
AC
= 0.1I
R
I
R
= 150µA
f = 10Hz to
10kHz
E
N
Notes:
(*)
Wideband noise voltage
60
µV(rms)
T
C
=
(V
R(MAX)
– V
R(MIN)
) x 1000000
V
R
x (T
(MAX)
– T
(MIN)
)
Note: V
R(MAX)
- V
R
(MIN)
is the maximum deviation in reference
voltage measured over the full operating temperature range.
(†)
R
S
=
V
R
Change (
IR(MIN)
to I
R(MAX
)
)
I
R(MAX)
– I
R(MIN)
)
.
ZR285
Document number: DS32168 Rev. 8 - 2
2 of 5
www.diodes.com
May 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
ZR285
Typical Characteristics
ZR285
Document number: DS32168 Rev. 8 - 2
3 of 5
www.diodes.com
May 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
ZR285
Ordering Information*
Order Reference
ZR285F01TA
ZR285F02TA
ZR285F03TA
Notes:
Tol
(%)
1
2
3
Device Mark
28C
28B
28A
Status (*)
Obsolete
Released
Obsolete
Reel Size
(inches)
7
7
7
Quantity
per reel
3000
3000
3000
Tape Width
(mm)
8
8
8
*ZR285F02TA is not recommended for new designs.
Package Outline Dimensions
E
e
b
3 leads
e1
L1
E1
D
A
A1
L
c
Dim.
A
A1
b
c
D
e
Millimeters
Min.
Max.
-
1.12
0.01
0.10
0.30
0.50
0.085
0.20
2.80
3.04
0.95 NOM
Inches
Min.
Max.
-
0.044
0.0004
0.004
0.012
0.020
0.003
0.008
0.110
0.120
0.037 NOM
Dim.
e1
E
E1
L
L1
-
Millimeters
Min.
Max.
1.90 NOM
2.10
2.64
1.20
1.40
0.25
0.60
0.45
0.62
-
-
Inches
Min.
Max.
0.075 NOM
0.083
0.104
0.047
0.055
0.0098
0.0236
0.018
0.024
-
-
Note:
Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
ZR285
Document number: DS32168 Rev. 8 - 2
4 of 5
www.diodes.com
May 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
ZR285
IMPORTANT NOTICE
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
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application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
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express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
systems.
Copyright © 2010, Diodes Incorporated
www.diodes.com
ZR285
Document number: DS32168 Rev. 8 - 2
5 of 5
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May 2010
© Diodes Incorporated
