PRECISION LOW-OHM METAL PLATE RESISTORS
RESISTORS CAPACITORS COILS DELAY LINES
LV3 SERIES - MOLDED 3-WATT LOR SERIES - CERAMIC 3- & 5-WATT
Term.W is Ideal for current sense applications RoHS compliant 0.0025Ω to .25Ω, 0.5% to 10% RoHS & 260°C compatible Low TC, high pulse capability Non-inductive metal element Available on RCD’s exclusive SWIFTTM delivery program! Choice of 2-terminal or 4-terminal designs
RCD LV3
LOR LOR 4T
OPTIONS
Opt.18: .040” lead dia. on LOR3 (.040” is std on LOR5) Option 4T: 4 Terminal Option E: Low thermal emf design Non-std resistance values, custom marking, burn-in, etc.
1.25” Typ
Series LOR rectangular shape and high thermal conductivity ceramic case efficiently transfers heat from the internal element resulting in excellent stability and overload capability. Series LV3 molded design offers improved uniformity for high-volume autoplacement applications. The resistance element of LOR and LV3 is non-inductive and constructed from near-zero TCR alloy minimizing thermal instability. Construction is flame retardent, solvent- and moisture-resistant. STANDARD RESISTANCE VALUES AND CODES
(Non-standard values available, most popular values listed in bold) .0025Ω (R0025), .003Ω (R003), .005Ω (R005), .0068Ω(R0068), .0075Ω (R0075), .0082Ω (R0082), .01Ω (R010 if ≤1%,R01 if ≥2%), .012Ω(R012), .015Ω (R015), .02Ω (R020 if≤ 1%, R02 if≥ 2%), .022Ω (R022), .025Ω (R025), .03Ω (R030 if ≤1%, R03 if ≥ 2%), .033Ω (R033), .04Ω (R040≤1%, R04≥2%), .05Ω (R050≤1%, R05≥2%), .068Ω(R068), .07Ω (R070 if ≤1%, R07 if ≥ 2%), .075Ω (R075), .08Ω (R080 if≤1%, R08 ≥2%), .1Ω (R100 if≤1%, R10 ≥2%), .15Ω (R150 if ≤1%, R15 ≥2%), .2Ω (R200 if ≤1%, R20 ≥2%), .25Ω (R250 if ≤1%, R25 ≥2%).
←
A
→
2nd pair of leads applies to Opt. 4T only
B B
↓ ↑d
X
X → ← Resis. Measurement Point
(see Applic. Note #1) WATTAGE @25°C 3W 5W 3W C U R R EN T RATING1 25A 40A 25A
C
LOR is rectangular, LV is cylindrical
RCD TYPE LOR3 LOR5 LV3
1
RESISTANCE RANGE (OHMS) .0025 to .25 .0025 to .25 .005 to 0.1
RESISTANCE MEASUREMENT POINT ±.062 [1.6] 1.310 [33.3] 1.670 [42.4] 1.310 [33.3]
DIMENSIONS A ±.04 [1] .551 [14] .880 [22.35] .513 [13] B ±.032 [.8] .256 [6.5] .320 [8.13] .142 [3.6] d ±.002 [.05] .032 [.8] .040 [1] .032 [.8]
3 Specify
3
C2 ±.032 [.8] .075 [1.9] .100 [2.54] n/a
Max. current is based on I= (P/R)1/2, not to exceed the value listed (increased levels avail). 2 Dim. C applies only to Opt.4T
opt.18 for .040 [1mm] lead dia
PERFORMANCE CHARACTERISTICS
,
POWER DERATING
% Rated Power
100 75 50 25 0 25 50 75 100 125 150 175 200 225 250 275
Test Parameter
Load Life Vibration Overload Temp. Coefficient Temp. Range Dielectric Strength Insulation Res. Terminal Strength Solderability Inductance
Performance, Typ.
0.5% +.5mΩ 0.05% +.5mΩ 5 Sec, 5X rated W (NTE Current Rating) (per chart, 4wire conn. at body) -55° to +275°C 1000 VAC 10,000MΩ min dry 10 lb. min. per Mil-STD-202, m.208 5nH to 20nH typ
Temperature °C
TEMPERATURE COEFFICIENT (typ.)
400 300 250 200 150 100 50 0 0 LOR3, LV3 LOR5, LOR3-18
Opt.4T
ppm/°C
10
20
Resistance (milli ohm)
30
40
50
60
70
80
90
APPLICATION NOTES:
1) 3W parts to be measured at 1.31” [33.3mm], 5W parts at 1.67” [42.4mm]. Also available per customer requirement. 2) 18AWG (0.040” dia) leads are standard on LOR5 and available on LOR3 (specify 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. have ~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.
P/N DESIGNATION:
RCD Type (LOR3, LOR5, or LV3)
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=0.01Ω, R150=0.15Ω 2%-10%: use 2 signif.digits & multiplier; R01=.01Ω, R10=.1Ω, etc. Use extra digits as needed R005, R0025, R0075, R012, etc.
Tolerance Code: D=0.5%, 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, Q= Tin/Lead (leave blank if either is acceptable, in which case RCD will select based on lowest price and quickest delivery)
RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603-669-0054 Fax: 603-669-5455 Email:sales@rcdcomponents.com
FA049C Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
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