ZRC250
PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE
ZRC250
Document number: DS32182 Rev. 6 - 2 1 of 5
www.diodes.com March 2012
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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 re quirements.
The ZRC250 design provides a stable voltage without an
external capacitor and is stable with capacitive loads. The
ZRC250 is recommended for operation between 20A 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 refere nce to withstand transient effects
and currents up to 200mA. Superior switching capability
allows the device to reach stable operati ng conditions i n only
a few microseconds.
Features
• Small outline SOT23 packag e
• No stabilizing capac itor required
• Low knee current, 15A typical
• Typical TC 30ppm/°C
• Typical slope resistanc e 0.4
• ±3, ±2 and ±1% tolerance
• Industrial temperature range
• Operating current 20A to 5mA
• Transient response, stable in less than 10s
• Green molding compound (No Br, Sb)
Applications
• Battery powered and portable equ ipment.
• Instrumentation.
• Test equipment.
Pin Assignments
SOT23 Package Suffix – F
1
3
2
V
R
GND
(Top View)
Pin 1 floating or connected to pin 2
Typical Application Circuit
ZRC250
PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE
ZRC250
Document number: DS32182 Rev. 6 - 2 2 of 5
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Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated)
Parameter Rating Unit
Reverse Current 25 mA
Forward Current 25 mA
Operating Temperature -40 to 85 °C
Storage Temperature -55 to 125 °C
Power Dissipation (TAMB = 25°C)
SOT23 330 mW
Electrical Characteristics (Test conditions: TAMB = 25°C, unless otherwise specified.)
Symbol Parameter Condition Min. Typ. Max. Tol. (%) Unit
VR Reverse breakdown voltage IR = 150µA 2.475
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
IR Recommended operating current 0.02 5 mA
TC(*) Average reverse breakdown voltage
temperature coefficient IR(MIN) to
IR(MAX) 30 90 ppm/°C
RS(†) Slope resistance 0.4 1
ZR Reverse dynamic impedance IR = 1mA
f = 100Hz
IAC = 0.1IR 0.3 0.8
EN Wideband noise voltage IR = 150µA
f = 10Hz to
10kHz 60 µV(rms)
Note:
(*)
(
)
()
TT
x
V
1000000x
VV
T)MIN()MAX(R
)MIN(R)MAX(R
C−
−
=
Note: VR(MAX) – VR(MIN) is the maximum deviation in reference
voltage measured over the full operating temperature range
(†)
(
)
II I
to
I
Change
V
R)MIN(R)MAX(R
)MAX(R)MIN(RR
S−
=
2.0 3.00.0 REVERSE VOLTAGE (V)
Reverse Characteristics
1.0
R
EVE
R
SE
C
U
R
R
EN
T
(µ A)
40
30
20
10
0
T = 25°C
A
ZRC250
PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE
ZRC250
Document number: DS32182 Rev. 6 - 2 3 of 5
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Typical Characteristics
0.001 0.1 10 100
FORWARD CURRENT (mA)
For w ar d Characteristics
10.01
0.4
FO
R
WA
R
D VOL
T
AG
E
(V)
0.6
0.8
1.0
1.2
1.4
0.2
0.0
20-40 -20 0 40 60 80
TE MPERATURE (°C)
Tem perature Drift
2.51
R
E
F
E
R
E
N
C
E
VOL
T
A
G
E
(V)
2.50
2.49
2.48
2.47
1.4
S
L
O
P
E
R
E
S
I
S
T
A
N
C
E
()
Ω
0.1 1 100
REFERENCE CURRENT (mA)
Slo pe Re si stance vs . C u rrent
10
T = -40°C
A
T = 25°C
A
T = 85°C
A
1.2
1.0
0.8
0.6
0.4
0.2
0.0
I = 150µA
R
I = 5mA
R
10 1K 10K
FREQUENCY (KHz)
Slope Resistance vs. Frequency
10 100K
0.1
100
1000
S
L
O
P
E
R
E
S
I
S
T
A
N
C
E
()
Ω
10
1
I = 1mA
R
I = 5mA
R
I = 150µA
R
1
0
2
0
10
V (V) V (V)
IN R
0 4 12 16
TIME (µs)
Transi ent Response
(S In gle Pulse )
8
0 4 12 16
TIME (µs)
Transi ent R esponse
(Repetitive Pulse)
8
1
0
2
0
10
V (V) V (V)
IN R
I = 5mA
R
I = 150µA
R
ZRC250
PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE
ZRC250
Document number: DS32182 Rev. 6 - 2 4 of 5
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Ordering Information*
Order
Reference Tol
(%) Package Device Mark Reel Size
(inches) Quantity
per reel Tape Width
(mm)
ZRC250F01TA 1 SOT23 25J 7 3000 8
ZRC250F02TA 2 SOT23 25H 7 3000 8
ZRC250F03TA 3 SOT23 25G 7 3000 8
Notes: *All ZRC250A variants (E-Line) are obsolete no longer available for sale. The closest alternative is the SOT23.
Package Outline Dimensions
SOT23
Suggested Pad Layout
SOT23
SOT23
Dim Min Max Typ
A 0.37 0.51 0.40
B 1.20 1.40 1.30
C 2.30 2.50 2.40
D 0.89 1.03 0.915
F 0.45 0.60 0.535
G 1.78 2.05 1.83
H 2.80 3.00 2.90
J 0.013 0.10 0.05
K 0.903 1.10 1.00
K1 - - 0.400
L 0.45 0.61 0.55
M 0.085 0.18 0.11
α 0° 8° -
All Dimensions in mm
Dimensions Value (in mm)
Z 2.9
X 0.8
Y 0.9
C 2.0
E 1.35
XE
Y
C
Z
A
M
JL
D
F
BC
H
K
G
K1
ZRC250
PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE
ZRC250
Document number: DS32182 Rev. 6 - 2 5 of 5
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Diodes Incorporated
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