LOR - RCD Components Inc.

PRECISION LOW-OHM METAL PLATE RESISTORS
LOR SERIES
OPTIONS
 Option 4T: 4 Terminal
 Option E: Low thermal emf design
 Non-std resistance values, custom marking, burn-in, etc.
↓
X
↑d (2Pl)
←
←
→
B
LOR
←
↓
↑d (4Pl)
A
B
X
Resis. Measurement Point
(see Applic. Note #1)
1.25” Typ
→
→
B
LOR 4T
B
C
LOR 4T
Series LOR rectangular shape and high thermal conductivity ceramic case efficiently transfers heat from the internal element resulting
in excellent stability and overload capability. The resistance element
is non-inductive and constructed from near-zero TCR alloy minimizing thermal instability. Construction is flame retardent, solvent- and
moisture-resistant. LOR (2-terminal design) is available to 0.5%
tolerance, LOR-4T (4-terminal design) is available to 0.1%.
STANDARD RESISTANCE VALUES AND CODES
(Non-standard values available, most popular values listed in bold)
STANDARD
VALUES
AND
CODES
.0025W
(R0025),RESISTANCE
.003W (R003), .005W
(R005),
.0068W
(R0068), .0075W
(Non-standard
values
available,
most popular
values
listed .012W
in bold)(R012),
(R0075),
.0082W
(R0082),
.01W (R010
if ≤1%,R01
if ≥2%),
.0025Ω
(R0025),
.003Ω
(R003),
.005Ω
.0075Ω
(R0075),
.015W
(R015),
.02W
(R020
if ≤1%,
R02 if(R005),
≥2%), .0068Ω(R0068),
.022W (R022), .025W
(R025),
.0082Ω
(R0082),
.01Ω
if ≤1%,R01
if ≥2%),
.012Ω(R012),
.015Ω(R015),
.03W
(R030
if ≤1%,
R03(R010
if ≥2%),
.033W (R033),
.04W
(R040 if ≤1%,
R04 if
.02Ω (R020
if≤1%,ifR02
if≥2%),
.025Ω (R025),
.03Ω (R030
≥2%),
.05W (R050
≤1%,
R05 if.022Ω
≥2%),(R022),
.068W (R068),
.07W (R070
if ≤1%,ifR07
R03
if ≥2%),
.033Ω
(R033),
(R040≤1%,
R04≥2%),
.05Ω if(R050≤1%,
if≤1%,
≥2%),
.075W
(R075),
.08W
(R080.04Ω
if ≤1%,
R08 if ≥2%),
.1W (R100
≤1%, R10
.068Ω(R068),
.07Ω
(R070
if ≤1%,
if ≥2%),
.075Ω
ifR05≥2%),
≥2%), .15W
(R150 if ≤1%,
R15
if ≥2%),
.2WR07
(R200
if ≤1%,
R20(R075),
if ≥2%),.08Ω
.25W
(R080 ifif≤1%,
.1Ω (R100 if≤1%, R10 ≥2%), .15Ω (R150 if ≤1%, R15
(R250
≤1%,R08
R25≥2%),
if ≥2%).
≥2%), .2Ω (R200 if ≤1%, R20 ≥2%), .25Ω (R250 if ≤1%, R25 ≥2%).
RCD
TYPE
WATTAGE
@25°C
MAX
CURRENT
RATING1
RESISTANCE
RANGE
(OHMS)
RESISTANCE
MEASUREMENT POINT
±.062 [1.6]
A ±.04 [1]
B ±.032 [.8]
d ±.002 [.05]
C2 ±.032 [.8]
LOR3
3W
25A
.0025 to .25
1.310 [33.3]
.551 [14]
.256 [6.5]
.032 [.8]3
.075 [1.9]
LOR4
4W
32A
.0025 to .25
1.310 [33.3]
.551 [14]
.256 [6.5]
.040 [1]4
.075 [1.9]
LOR5
5W
40A
.0025 to .25
1.670 [42.4]
.880 [22.35]
.320 [8.13]
.040 [1]
.100 [2.54]
PERFORMANCE CHARACTERISTICS
Test Parameter
Performance, Typ.
Load Life
0.5% +.5MW
Vibration
0.05% +.5MW
Overload
5 Sec, 5X Rated W
(NTE Current Rating)
Temp. Coefficient
(per chart, 4-wire conn. at body)
Temp. Range
-55° To +275°C
Dielectric Strength
1000 VAC
Insulation Res.
10,000MW min. dry
Terminal Strength
10 lb. min.
Solderability
Per Mil-STD-202, m.208
Inductance
Non-Inductrive (3nH to 20nH typ.)
APPLICATION NOTES:
1) LOR3 & 4 parts have resistance measured at 1.31” [33.3mm], LOR5 at 1.67”
[42.4mm]. Also available per customer requirement.
2) 18AWG (.040” dia) leads are standard on LOR4 & 5 and available on LOR3 by
specifying opt.18. RCD recommends .040” leads, since the heavier gauge results in
lower lead resistance, improved heat transfer, and lower in-circuit TCR (.032” leadwires
have resistivity of ~1mΩ/in., 0.04” dia. ~0.6mΩ/in). An extra inch of .032” leadwire in
the circuit will increase the TC of a 10mΩ resistor by roughly 350ppm. Keep leadwires
short for best TC stability.
3) To achieve utmost precision in current sense or shunt applications, RCD offers
LOR3 & LOR5 in 4-terminal version, specify opt.4T (eliminates lead resistance when
utilized in Kelvin configuration). Request App. note #R31 for performance comparison
of 2- vs. 4-terminal.
3
DIMENSIONS
Specify opt.18 for .040 [1mm] lead dia 4Specify opt.20 for .032 [0.8mm] lead dia
POWER DERATING
% Rated Power
I=(P/R)1/2, not to exceed max current rating (increased levels avail). 2 Dim. C applies to Opt.4T
100
75
50
25
0 25
50
75
100
125
150
175
200
Temperature °C
225
250
275
70
80
90
TEMPERATURE COEFFICIENT (typ.)
ppm/°C
1
A
LOR
2-Terminal & 4-Terminal
Term.W
 Ideal for current sense applications
is Pb-free
and RoHS
 0.0025Ω to .25Ω, 0.1% to 10%
RoHS compliant
 Low TC, high pulse capability
 Non-inductive metal element
 Available on RCD’s exclusive SWIFTTM delivery program!
1.25” Typ
RESISTORSCAPACITORSCOILSDELAY LINES
400
300
250
200
150
100
50
0
0
LOR3
LOR4, LOR5,
LOR3-18
Opt.4T
10
20
30
40
50
60
Resistance (milli ohm)
P/N DESIGNATION:
RCD Type (LOR3, LOR4, LOR5)
LOR3
- R05 - J B W
Options: E, 4T, 18 (leave blank if standard)
Resis. Code (see table above):
0.5% & 1%: 3 signif. digits & multiplier; R010=.01Ω, R150=.15Ω
2%-10%: use 2 signif.digits & multiplier; R01=.01Ω, R10=.1Ω, etc.
Use extra digits as needed R005, R0025, R0075, R012, etc.
Tolerance: B=.1%, C=.25%, D=.5%, F=1%, G=2%, H=3%, J=5%, K=10%
Packaging: B = bulk (std.),T = Tape & Reel (not avail. on option 4T)
Termination: W= Lead-free (std), Q= Tin/Lead (leave blank if both acceptable)
RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603-669-0054 Fax: 603-669-5455 Email:[email protected]
55
FA049D
Sale of this product is in accordance with GF-061. Specifications subject to change without notice.