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LM4040AEM3-2.5+T-LM4040AEM3-3.0/V+T-LM4040AEM3-3.0+-LM4040AEM3-3.0+T-LM4040AEM3-4.1+T-LM4040AEM3-5.0+T-LM4040AEX3-3.0+T-LM4040AIM3-2.1+T-LM4040AIM3-2.5+T-LM4040AIM3-3.0+T-LM4040AIM3-4.1+T-LM4040AIM3-5.0+T-LM4040AIX3-2.1+T-LM4040AIX3-3.0-LM4040BEM3-3.0+T-LM4040BEM3-4.1+T-LM4040BEM3-5.
Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
General DescriptionThe LM4040 is a precision two-terminal shunt mode,
bandgap voltage reference available in fixed reverse
breakdown voltages of 2.048V, 2.500V, 3.000V, 3.3V,
4.096V, and 5.000V. Ideal for space-critical applica-
tions, the LM4040 is offered in the subminiature 3-pin
SC70 surface-mount package (1.8mm ✕1.8mm), 50%
smaller than comparable devices in SOT23 surface-
mount packages (SOT23 versions are also available).
Laser-trimmed resistors ensure precise initial accuracy.
With a 100ppm/°C temperature coefficient, the device
is offered in four grades of initial accuracy ranging from
0.1% to 1%. The LM4040 has a 60µA to 15mA shunt
current capability with low dynamic impedance, ensur-
ing stable reverse breakdown voltage accuracy over a
wide range of operating temperatures and currents.
The LM4040 does not require an external stabilizing
capacitor while ensuring stability with any capacitive
load.
The LM4040 is guaranteed over the temperature range
of -40°C to +125°C.
For a 1.225V output version, refer to the LM4041 data
sheet.
________________________ApplicationsPortable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
FeaturesUltra-Small 3-Pin SC70 Package0.1% (max) Initial Accuracy100ppm/°C (max) Temperature Coefficient
Guaranteed over -40°C to +125°C Temperature
RangeWide Operating Current Range: 60µA to 15mALow 28µVRMSOutput Noise (10Hz to 10kHz)2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V
Fixed Reverse Breakdown VoltagesNo Output Capacitors RequiredTolerates Capacitive LoadsN.C.*
LM4040
SC70-3/SOT23-3TOP VIEW
*PIN 3 MUST BE LEFT UNCONNECTED
OR CONNECTED TO PIN 2.
Pin Configuration
Ordering Information appears at end of data sheet.
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—2.048V(IR= 100µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Reverse Current (cathode to anode)..................................20mA
Forward Current (anode to cathode)..................................10mA
Continuous Power Dissipation (TA= +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C)............174mW
3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mW
Operating Temperature Range
LM4040_I_ _ _..................................................-40°C to +85°C
LM4040_E_ _ _..............................................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s)..................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLM4040A (0.1%)2.0462.0482.050
LM4040B (0.2%)2.0442.0482.052
LM4040C (0.5%)2.0382.0482.058Reverse Breakdown VoltageVRTA = +25°C
LM4040D (1.0%)2.0282.0482.068
LM4040A±2.0±15
LM4040B±4.0±17
LM4040C±10±23
Reverse Breakdown Voltage
Tolerance (Note 2)VR
LM4040D±20±41
LM4040A/B/C4565Minimum Operating CurrentIRMINLM4040D4570µA
IR = 10mA±20
LM4040A/B/C±15±100IR = 1mALM4040D±15±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆VR/∆T
IR = 100µA±15
ppm/°C
LM4040A/B/C0.31.0IRMIN ≤ IR ≤ 1mALM4040D0.31.2
LM4040A/B/C2.58.0
Reverse Breakdown Voltage
Change with Operating
Current Change1mA ≤ IR ≤ 15mALM4040D2.510.0
LM4040A/B0.30.8
LM4040C0.30.9Reverse Dynamic
Impedance (Note 3)ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040D0.31.1
Wideband NoiseeNIR = 100µA, 10Hz ≤ f ≤ 10kHz28µVRMS
Reverse Breakdown Voltage
Long-Term Stability∆VRT = 1000h120ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—2.500V(IR= 100µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLM4040A (0.1%)2.49752.50002.5025
LM4040B (0.2%)2.49502.50002.5050
LM4040C (0.5%)2.48752.50002.5125Reverse Breakdown VoltageVRTA = +25°C
LM4040D (1.0%)2.47502.50002.5250
LM4040A±2.0±19
LM4040B±4.0±21
LM4040C±10±29
Reverse Breakdown Voltage
Tolerance (Note 2)VR
LM4040D±20±49
LM4040A/B/C4565Minimum Operating CurrentIRMINLM4040D4570µA
IR = 10mA±20
LM4040A/B/C±15±100IR = 1mALM4040D±15±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆VR/∆T
IR = 100µA±15
ppm/°C
LM4040A/B/C0.31.0IRMIN ≤ IR ≤ 1mALM4040D0.41.2
LM4040A/B/C2.58.0
Reverse Breakdown Voltage
Change with Operating
Current Change1mA ≤ IR ≤ 15mALM4040D2.510.0
LM4040A/B0.30.8
LM4040C0.30.9Reverse Dynamic
Impedance (Note 3)ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040D0.31.1
Wideband NoiseeNIR = 100µA, 10Hz ≤ f ≤ 10kHz35µVRMS
Reverse Breakdown Voltage
Long-Term Stability∆VRT = 1000h120ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—3.000V(IR= 100µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLM4040A (0.1%)2.9973.0003.003
LM4040B (0.2%)2.9943.0003.006
LM4040C (0.5%)2.9853.0003.015Reverse Breakdown VoltageVRTA = +25°C
LM4040D (1.0%)2.9703.0003.030
LM4040A±3.0±22
LM4040B±6.0±26
LM4040C±15±34
Reverse Breakdown Voltage
Tolerance (Note 2)VR
LM4040D±30±59
LM4040A/B/C4567Minimum Operating CurrentIRMINLM4040D4570µA
IR = 10mA±20
LM4040A/B/C±15±100IR = 1mALM4040D±15±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆VR/∆T
IR = 100µA±15
ppm/°C
LM4040A/B/C0.31.0IRMIN ≤ IR ≤ 1mALM4040D0.31.2
LM4040A/B/C2.58.0
Reverse Breakdown Voltage
Change with Operating
Current Change1mA ≤ IR ≤ 15mALM4040D2.510.0
LM4040A/B0.30.8
LM4040C0.30.9Reverse Dynamic
Impedance (Note 3)ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040D0.31.1
Wideband NoiseeNIR = 100µA, 10Hz ≤ f ≤ 10kHz45µVRMS
Reverse Breakdown Voltage
Long-Term Stability∆VRT = 1000h120ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—3.300V(IR= 100µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLM4040A (0.1%)3.29673.30003.3033
LM4040B (0.2%)3.29343.30003.3066
LM4040C (0.5%)3.28353.30003.3165Reverse Breakdown VoltageVRTA = +25°C
LM4040D (1.0%)3.26703.30003.3330
LM4040A±3.0±22
LM4040B±6.0±26
LM4040C±15±34
Reverse Breakdown Voltage
Tolerance (Note 2)VR
LM4040D±30±59
LM4040A/B/C4567Minimum Operating CurrentIRMINLM4040D4570µA
IR = 10mA±20
LM4040A/B/C±15±100IR = 1mALM4040D±15±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆VR/∆T
IR = 100µA±15
ppm/°C
LM4040A/B/C0.31.0IRMIN ≤ IR ≤ 1mALM4040D0.31.2
LM4040A/B/C2.58.0
Reverse Breakdown Voltage
Change with Operating
Current Change1mA ≤ IR ≤ 15mALM4040D2.510.0
LM4040A/B0.30.8
LM4040C0.30.9Reverse Dynamic
Impedance (Note 3)ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040D0.31.1
Wideband NoiseeNIR = 100µA, 10Hz ≤ f ≤ 10kHz50µVRMS
Reverse Breakdown Voltage
Long-Term Stability∆VRT = 1000h120ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—4.096V(IR= 100µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLM4040A (0.1%)4.0924.0964.100
LM4040B (0.2%)4.0884.0964.104
LM4040C (0.5%)4.0764.0964.116Reverse Breakdown VoltageVRTA = +25°C
LM4040D (1.0%)4.0554.0964.137
LM4040A±4.1±31
LM4040B±8.2±35
LM4040C±20±47
Reverse Breakdown Voltage
Tolerance (Note 2)VR
LM4040D±41±81
LM4040A/B/C5073Minimum Operating CurrentIRMINLM4040D5078µA
IR = 10mA±30
LM4040A/B/C±20±100IR = 1mALM4040D±20±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆VR/∆T
IR = 100µA±15
ppm/°C
LM4040A/B/C0.51.2IRMIN ≤ IR ≤ 1mALM4040D0.51.5
LM4040A/B/C3.010.0
Reverse Breakdown Voltage
Change with Operating
Current Change1mA ≤ IR ≤ 15mALM4040D3.013.0
LM4040A/B/C0.51.0Reverse Dynamic
Impedance (Note 3)ZRIR = 1mA, f = 120Hz,
IAC = 0.1IRLM4040D0.51.3Ω
Wideband NoiseeNIR = 100µA, 10Hz ≤ f ≤ 10kHz64µVRMS
Reverse Breakdown Voltage
Long-Term Stability∆VRT = 1000h120ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Note 1:All devices are 100% production tested at TA= +25°C and are guaranteed by design for TA= TMINto TMAX, as specified.
Note 2:The overtemperature limit for Reverse Breakdown Voltage Tolerance is defined as the room-temperature Reverse
Breakdown Voltage Tolerance ±[(∆VR/∆T)(max∆T)(VR)], where ∆VR/∆T is the VRtemperature coefficient, max∆T is the maxi-
mum difference in temperature from the reference point of +25°C to TMINor TMAX, and VRis the reverse breakdown volt-
age. The total overtemperature tolerance for the different grades in the temperature range where max∆T = +65°C is shown
below:
A grade: ±0.75% = ±0.1% ±100ppm/°C ✕65°C
B grade: ±0.85% = ±0.2% ±100ppm/°C ✕65°C
C grade: ±1.15% = ±0.5% ±100ppm/°C ✕65°C
D grade: ±1.98% = ±1.0% ±150ppm/°C ✕65°C
The total over-temperature tolerance for the different grades in the extended temperature range where max ∆T = +100°C is
shown below:
A grade: ±1.1% = ±0.1% ±100ppm/°C ✕100°C
B grade: ±1.2% = ±0.2% ±100ppm/°C ✕100°C
C grade: ±1.5% = ±0.5% ±100ppm/°C ✕100°C
D grade: ±2.5% = ±1.0% ±150ppm/°C ✕100°C
Therefore, as an example, the A-grade LM4040-2.5 has an over-temperature reverse breakdown voltage tolerance of ±2.5V0.75% = ±19mV.
Note 3:Guaranteed by design.
ELECTRICAL CHARACTERISTICS—5.000V(IR= 100µA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLM4040A (0.1%)4.9955.0005.005
LM4040B (0.2%)4.9905.0005.010
LM4040C (0.5%)4.9755.0005.025Reverse Breakdown VoltageVRTA = +25°C
LM4040D (1.0%)4.9505.0005.050
LM4040A±5.0±38
LM4040B±10±43
LM4040C±25±58
Reverse Breakdown Voltage
Tolerance (Note 2)VR
LM4040D±50±99
LM4040A/B/C5480Minimum Operating CurrentIRMINLM4040D5485µA
IR = 10mA±30
LM4040A/B/C±20±100IR = 1mALM4040D±20±150
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆VR/∆T
IR = 100µA±15
ppm/°C
LM4040A/B/C0.51.4IRMIN ≤ IR ≤ 1mALM4040D0.51.8
LM4040A/B/C3.512.0
Reverse Breakdown Voltage
Change with Operating
Current Change1mA ≤ IR ≤ 15mALM4040D3.515.0
LM4040A/B/C0.51.1Reverse Dynamic
Impedance (Note 3)ZRIR = 1mA, f = 120Hz,
IAC = 0.1IRLM4040D0.51.5Ω
Wideband NoiseeNIR = 100µA, 10Hz ≤ f ≤ 10kHz80µVRMS
Reverse Breakdown Voltage
Long-Term Stability∆VRT = 1000h120ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
LM4040-2.5V
TEMPERATURE DRIFTLM4040-02
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
LM4040-5.0V
TEMPERATURE DRIFT
LM4040 toc03
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
Typical Operating Characteristics
(IR= 100µA, SC70-3 package, TA= +25°C, unless otherwise noted.)
REVERSE CHARACTERISTICS AND
MINIMUM OPERATING CURRENT
LM4040-01
REVERSE CURRENT (μA)
REVERSE VOLTAGE (V)
LM4040_I_3-5.0LM4040_I_3-4.1
LM4040_I_3-3.0
LM4040_I_3-2.5
LM4040_I_3-2.1
LM4040-5.0V
REVERSE VOLTAGE vs. ISHUNTLM4040 toc05
ISHUNT (mA)
REVERSE VOLTAGE CHANGE (mV)105
TA = -40°C
TA = +125°C
TA = +85°C
TA = +25°C
LM4040-2.5V
REVERSE VOLTAGE vs. ISHUNTLM4040-04
ISHUNT (mA)
REVERSE VOLTAGE CHANGE (mV)105
TA = +125°C
TA = -40°C
TA = +25°C
TA = +85°C
