LM334Z National Semiconductor, LM334Z Datasheet - Page 8
![IC, ADJ CURRENT SOURCE 40V, 10mA, TO92-3](/photos/19/7/190759/3833592_sml.gif)
LM334Z
Manufacturer Part Number
LM334Z
Description
IC, ADJ CURRENT SOURCE 40V, 10mA, TO92-3
Manufacturer
National Semiconductor
Datasheet
1.LM334SM.pdf
(14 pages)
Specifications of LM334Z
Forward Current If
10mA
Forward Voltage
40V
Power Dissipation Pd
400mW
Current Regulator Case Style
TO-92
No. Of Pins
3
Supply Voltage Range
1V To 40V
Sensor Case Style
TO-92
Accuracy %
3%
Current Rating
1 To 10A
Rohs Compliant
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM334Z
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LM334Z#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LM334Z#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LM334Z/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
www.national.com
Application Hints
If the forward voltage drop of the diode was 0.65V instead of
the estimate of 0.6V (an error of 8%), the actual set current
will be
an error of less than 5%.
If the estimate for the tempco of the diode’s forward voltage
drop was off, the tempco cancellation is still reasonably
effective. Assume the tempco of the diode is 2.6mV/˚C in-
stead of 2.5mV/˚C (an error of 4%). The tempco of the circuit
is now:
A 1mA LM134 current source with no temperature compen-
sation would have a set resistor of 68Ω and a resulting
tempco of
So even if the diode’s tempco varies as much as
its estimated value, the circuit still eliminates 98% of the
LM134’s inherent tempco.
Typical Applications
*Select R3 = V
Trim R3 to calibrate
Ground Referred Fahrenheit Thermometer
REF
/583µA. V
REF
may be any stable positive voltage ≥ 2V
(Continued)
±
4% from
00569715
8
*Output impedance of the LM134 at the “R” pin is approximately
where R
to ground. This negative resistance can be reduced by a factor of 5 or
more by inserting an equivalent resistor R
output.
Terminating Remote Sensor for Voltage Output
2
is the equivalent external resistance connected from the V
Low Output Impedance Thermometer
Low Output Impedance Thermometer
3
= (R
2
00569714
/16) in series with the
00569706
00569716
−
pin