ZXRE330
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Description
The ZXRE330 is a low knee current 3.3V voltage reference.
Offering tight tolerances and sharp knee characteristics –
consuming only 1µA when the 3.3V reference voltage can no
longer be maintained.
Excellent performance is maintained over the 1µA to 5mA
operating current range. The device has been designed to be
highly tolerant of capacitive loads so maintaining excellent stability.
It’s available in small outline SOT23 and TO92 packages This
device offers a pin for pin compatible alternative to industry
standard shunt voltage reference.
Pin Assignments
ZXRE330xSA (SOT23)
Cath ode
3
1
*
Anod e
2
Top v iew
* Pin 1 mu st be left floating or con nected to pin 2
ZXRE330xV (TO92)
3 Cathode
2 *
1 Anode
(Top View)
* Pin 2 must be left floating or connected to pin 1
Features
Small packages: SOT23 & TO92
No output capacitor required
Output voltage tolerance
ZXRE330E ±2% at +25°C
ZXRE330A ±0.5% at +25°C
Low output noise
(10Hz to 10 kHz).............. 55µV
RMS
Wide operating current range 1µA to 5mA
Extended temperature range -40°C to +85°C
Low temperature coefficient 20ppm/°C (Typ)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Battery powered equipment
Precision power supplies
Portable instrumentation
Portable communications devices
Notebook and palmtop computers
Data acquisition systems
Low current voltage clamps
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
ZXRE330
Document number: DS36772 Rev. 2 - 2
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+
+
January 2014
© Diodes Incorporated
ZXRE330
Typical Applications Circuit
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Continuous Reverse Current
Continuous Forward Current
Operating Junction Temperature
Storage Temperature
Note:
(Voltages to GND Unless Otherwise Stated)
Unit
mA
mA
°C
°C
Rating
10
10
-40 to +150
-65 to +150
4. Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum rating, for extended periods, may reduce
device reliability. Unless otherwise stated voltages specified are relative to the ANODE pin.
Package Thermal Data
Package
SOT23
TO92
θ
JA
415°C/W
180°C/W
P
DIS
T
AMB
= +25°C, T
J
= +150°C
300mW
700mW
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Reverse Current
Operating Ambient Temperature Range
Min.
0.002
-40
Max.
5
+85
Units
mA
°C
ZXRE330
Document number: DS36772 Rev. 2 - 2
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ZXRE330
Electrical Characteristics
(@T
A
= +25°C, unless otherwise specified.)
Symbol
Parameter
Reverse breakdown voltage
V
REF
I
R
= 100μA
I
R
= 100μA
+25°C
Conditions
T
AMB
+25°C
ZXRE330A
ZXRE330E
+25°C
-40 to +85°C
-40 to +85°C
25°C
-40 to +85°C
25°C
-40 to +85°C
—
0.5
—
±20
±15
±15
0.2
—
10
—
1
2
55
—
0.08
Typ.
3.3
E Limits
—
±16.5
±66
±99
—
1
—
±150
—
—
0.6
—
20
2
—
—
—
—
µA
Ω
µV
RMS
ppm
%
mV
µA
—
ppm/°C
—
mV
Units
V
Reverse breakdown voltage tolerance
-40 to +85°C
I
ROFF
Off state reverse current
V = V
REF
*0.9
I
R
= 5mA
I
R
= 100µA
I
R
= 10µA
2uA <I
R
< 100uA
100uA < I
R
< 5mA
∆V
R
/∆T
Average reverse breakdown voltage
temperature coefficient
∆V
R
Reverse breakdown
change with current
I
RMIN
Z
R
e
n
V
R
V
HYST
Minimal Operating Current
Dynamic output impedance
Noise voltage
Long term stability (non cumulative)
Thermal hysteresis
—
I
R
= 2mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA
10Hz < f < 10kHz
t = 1000Hrs, I
R
= 100µA
∆T
= -40°C to +85°C
ZXRE330
Document number: DS36772 Rev. 2 - 2
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January 2014
© Diodes Incorporated
ZXRE330
Typical Characteristics
3.35
3.34
3.33
3.35
IR=100uA
3.34
3.33
IR=1mA
Reverse Voltage (V)
3.31
3.30
3.29
3.28
3.27
3.26
3.25
-50
-25
0
25
50
o
Reverse Voltage (V)
75
100
125
3.32
3.32
3.31
3.30
3.29
3.28
3.27
3.26
3.25
-50
-25
0
25
50
o
75
100
125
Ambient Temperature ( C)
Ambient Temperature ( C)
Reverse Breakdown Voltage Temperature Coefficient
Reverse Breakdown Voltage Temperature Coefficient
10
9
8
T
A
=-40 C
T
A
=25 C
o
o
o
7
6
5
4
3
2
1
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Reverse Current (mA)
Reverse Current (uA)
T
A
=85 C
10
o
9
T =25 C
A
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Reverse Voltage (V)
Reverse Voltage (V)
Minimal Operating Current
Reverse Current vs. Reverse Voltage
0.60
5
VR=3V
0.55
I
R
=100uA
4
T
A
=25 C
o
off-state Reverse Current (uA)
0.50
0.45
0.40
0.35
0.30
Noise(
V/
z)
-50
-25
0
25
50
o
3
2
1
0.25
0.20
75
100
125
0
10
100
1k
10k
Ambient Temperature ( C)
Frequency (Hz)
Off-state Reverse Current vs. Temperature
Noise Voltage vs. Frequency
ZXRE330
Document number: DS36772 Rev. 2 - 2
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ZXRE330
Start Up Characteristics ZXRE330
Input
Input
Output
Output
I
R
=100μA, No Load Capacitor
I
R
=5mA, No Load Capacitor
Application Information
In a conventional shunt regulator application (
Figure 1
), an external series resistor (R
S
) is connected between the supply voltage, V
S
, and the
ZXRE330.
R
S
determines the current that flows through the load (I
L
) and the ZXRE330 (I
R
). Since load current and supply voltage
may vary, R
S
should be small enough to supply at least the minimum acceptable I
R
to the ZXRE330 even when the
V
S
supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum
and I
L
is at its minimum, R
S
should be large enough so that the current flowing through the ZXRE330 is less than 10 mA.
I
R
+
R
S
I
L
I
L
V
R
R
S
is determined by the supply voltage, (V
S
), the load and operating current, (I
L
and I
R
), and the ZXRE330’s reverse
breakdown voltage, V
R
.
R
S
½
I
R
V
S
V
R
I
L
I
R
Printed circuit board layout considerations
ZXRE330 in the SOT23 package have the die attached to pin 1, which results in an electrical contact between pin 2 and
pin 3. Therefore, pin 1 of the SOT23 package must be left floating or connected to pin 2.
ZXRE330 in the TO92 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin
1. Therefore, pin 2 must be left floating or connected to pin1.
ZXRE330
Document number: DS36772 Rev. 2 - 2
5 of 8
www.diodes.com
January 2014
© Diodes Incorporated
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