Rev. 5/3/01
SPX4041 Precision 1.24V Shunt Voltage Reference
Copyright 2001 Sipex Corporation
1
SPX4041
Precision 1.24V Shunt Voltage Reference
FEATURES
APPLICATIONS
Voltage Tolerance.......................... 1% and 2%
Constant Current Source
Wide Operating Current............100uA to 15mA
Digital Voltmeter
Low Temperature Coefficient ............50 ppm/
C
Power Management
Fixed Reversed Breakdown Voltage ........ 1.24V
Precision Regulators
Offered in TO-92, SOIC, SOT-23-3
Battery Powered Equipment
No Output Capacitance Required
Instrumentation
Two Terminal Zener Operation
Automotive Electronics
Improved Replacement in Performance for TL431, AS4041
Data Acquisition Systems
PRODUCT DESCRIPTION
The SPX4041 is a two-terminal, temperature compensated, band-gap voltage reference, which provides a fixed 1.24V output for input
currents between 160
A to 15mA. The bandgap voltage (1.24V) is independently laser trimmed from the output voltage to achieve a
very low temperature coefficient, then the output voltage is laser trimmed to 1.24 volts. This trimming technique and the low
temperature coefficient (A grade 50 ppm/
C) thin film resistor process gives a very stable device over the full temperature range. The
SPX4041 is available in the sub-miniature (3mm
1.3mm) SOT-23, SOIC-8 surface mount package, or TO-92 package. The
operating temperature is -40
C to 85
C.
The SPX4041 advanced design eliminates the need for an external stabilized capacitor while insuring stability with any capacitive
load, making them easy to use.
Anode (A)
Cathode (K)
1.24V
+
-
Figure 1. Block Diagram
Rev. 5/3/01
SPX4041 Precision 1.24V Shunt Voltage Reference
Copyright 2001 Sipex Corporation
2
SPX4041
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATING
UNITS
Anode-Cathode Forward Current
I
AK
10
mA
Reverse Current
I
KA
20
mA
Continuous Power Dissipation at 25
C
TO-92
SOT-23
SOIC-8
P
D
550
300
525
mW
mW
mW
Junction Temperature
T
J
150
C
Storage Temperature
T
STG
- 65 to 150
C
Lead Temperature (Soldering 10 sec.)
T
L
300
C
Operating Temperature Range
T
A
-40
C
T
A
85
C
C
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
TYPICAL THERMAL RESISTANCES
PACKAGE
0
JA
0
JC
TYPICAL DERATING
TO-92
160
C/W
80
C/W
6.3 mW/
C
SOT-23
575
C/W
150
C/W
1.7 mW/
C
SOIC-8
175
C/W
45
C/W
5.7 mW/
C
Typical deratings of the thermal resistances are given for ambient temperature >25
C.
Rev. 5/3/01
SPX4041 Precision 1.24V Shunt Voltage Reference
Copyright 2001 Sipex Corporation
3
SPX4041
ELECTRICAL CHARACTERISTICS
at I
IN
= 1000
A, and T
A
= +25
C unless otherwise noted.
Parameters
Conditions
SPX4041A
Min Typ Max
SPX4041
Min Typ Max
Units
Reverse Breakdown Voltage
I
R
=500
A
1.24
1.24
V
Reverse Breakdown
Tolerance
I
R
=500
A
-40
o
C <T
A
<85
o
C
12
29
25
49
mV
mV
Dynamic Output Impedance
0.60
2
0.60
2
Noise Voltage
0.1kHz
f
10Hz
1 5
1 5
V p-p
Temperature Coefficient
Note 1
100
100
ppm/
C
Turn-on Setting
0.1% of V
OUT
3 0
3 0
Sec
Temperature Range (T
A
)
-40
8 5
-40
8 5
C
Operating Current Range
Note 2
0.5
5
1 5
0.5
5
1 5
mA
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
T
V
KA
0
15
30
45
60
75
90
105
-5
0.5
5000
0
0
0
0.07 mV/
C
0.003 %/
C
27 ppm/
C
TC in mV/
C =
TC in % /
C =
V
KA
(mV)
T
A
T
A
V
KA
at 25
C
V
KA
x 100
(
)
TC in ppm/
C =
T
A
V
KA
at 25
C
V
KA
x 10
6
(
)
ppm
%
mV
Junction Temperature (
C)
Figure 2. V
REF
vs. Temperature
Rev. 5/3/01
SPX4041 Precision 1.24V Shunt Voltage Reference
Copyright 2001 Sipex Corporation
4
SPX4041
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
V
KA
I
K
-2
-1
0
1
2
3
0
I
K
- Cathode Current (mA)
V
KA
- Cathode Voltage (V)
Temperature Range: 0
C to 105
C
15.0
12.5
10.0
7.5
5.0
2.5
-2.5
-5.0
-7.5
-10.0
1.24
Figure 3. Test Circuit
Figure 4. High Current Operating Characteristics
V
REF
- Reference Voltage (V)
T
A
- Ambient Temperature (
C)
-60
I
K
= 10mA
1.20
1.21
1.22
1.23
1.24
1.25
1.26
-30
0
30
60
90
900
800
700
600
500
400
300
200
100
0
-100
-200
-1.0
0
=
105
C
25
C
-0
C
V
KA
= V
REF
Temperature Range: 0
C to 105
C
V
KA
- Cathode Voltage (V)
I
K
- Cathode Current (
A)
-0.5
0.25
0.5
0.75
1.0
1.25
1.5
1.24
Figure 5. Reference Voltage vs. Ambient Temperature
Figure 6. Low Current Operating Characteristics
Rev. 5/3/01
SPX4041 Precision 1.24V Shunt Voltage Reference
Copyright 2001 Sipex Corporation
5
SPX4041
TYPICAL PERFORMANCE CHARACTERISTICS
20
10
10
100
1 k
10 k
100 k
0
70
30
40
50
60
-60
-30
0
30
60
90
120
0.0
0.025
0.050
0.075
0.100
0.125
0.150
Noise Voltage nV/
Hz
f - Frequency (Hz)
Z
KA
Dynamic Impedance (
)
T
A
- Free Air Temperature
I
K
= 10mA
T
A
= 25
C
I
KA
= 160
A to 15mA
f
1kHz
Figure 7. Noise Voltage vs. Frequency
Figure 8. Low Frequency Dynamic Output Impedance vs.
T
AMBIENT
GND
V
OUT
50
f
p
= 100kHz
125
V
IN
Figure 9a. Frequency = 100kHz, I
K
= 10mA, T
A
= 25
C
Figure 9b. Test Circuit for Pulse Response
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