Metal Alloy Zero Ohm Jumper Chip Resistors (LRJ)

A zero ohm resistor is often called SMD jumper resistors, milli-ohm resistor, or zero ohm link resistors which are designed to link to circuits to together just like any other wire.

Direct's true metal alloy strip zero ohm resistors (LRJ) make options with a lot less space and cost than DIP switches and jumper headers. These high current metal alloy jumper resistor chips (LRJ) SMT series, designed to replace zero ohm resistors without changing board designs or layouts.The devices could also be applied in high power applications to replace jumper wire for better stability or buried copper coin PCB for cost saving.

Five jumpers for the different resistor chip sizes are provided a wide range of standard dimensions 1206, 2512, 2817, 2725, and 4527 to make ease of designs along with footprint template compatibility. Direct (LRJ) SMD metal alloy current jumper resistors designed for applications that require high power handling (Up to 5W) with resistance < 0.2mΩ at operating temperature range -55°C~+150°C. (LRJ). These new products are distinctively suited as true zero ohm resistor replacements.

Direct (LRJ) resistor chip jumpers manufactured from metal alloy plate and designed to deliver a extremely low impedance and profile circuit linkage as a zero ohm resistor. Chip jumpers are packaged on tape and reel for compatibility with most vacuum or mechanical pick and place assembly systems. These (LRJ) SMD devices are also suitable for high current, high-density PCB packages on power and aluminum backplanes.

Some circuit boards are designed with multiple functions and configurations in one design. Often these functions and configurations can't coexist in single circuit because they will conflict with each other. To this end, more and more designers use (LRJ) resistor SMD jumpers for single side PCB that has no through-hole but for double-sided PCB. An application is used as a dummy, when through-holes for a not- yet- designed- resistor are prepared by way of precaution, and the holes are short-circuited after all.

Direct electronics delivers the right chip for your low range, current-sense applications. For more detailed product information and data sheets or to discuss your specific requirements please contact Direct electronics. Downloads Complete Specification PDF Metal Alloy Zero Ohm Jumper link Resistors (LRJ).

Features :
  1. High current application with Low profile.
  2. Ultra-Low resistance values, 0.2 mΩ Max.
  3. operating temperature range -55°C~+150°C.
  4. Wide range package sizes 1206, 2512, 2817, 2725, and 4527.
Applications :
  1. Electrical tools, Power Management
  2. NB, Mobil Device, Server, Portable Devices
  3. Automotive, Industrial, Consumer Electronics, Electric Instrument
Zero Ohm Resistors (LRJ) Construction & Dimensions
Zero Ohm Jumper link Resistors (LRJ) Construction & Dimensions
Zero Ohm Jumper link Resistors (LRJ) Construction & Dimensions
1 Solder Plating (Sn)
2 Alloy Plate
3 Overcoat
Type Power Rating at 70℃(W) Dimensions (Unit: mm)
L W T D
LRJ1206 1 3.200±0.254 1.650±0.254 0.670±0.254 0.508±0.254
LRJ2512 2 6.350±0.254 3.050±0.254 0.670±0.254 1.100±0.254
LRJ2817 3 7.100±0.254 4.200±0.254 0.770±0.254 1.500±0.254
LRJ2725 4 6.800±0.254 6.350±0.254 0.770±0.254 1.800±0.254
LRJ4527 5 11.300±0.500 6.600±0.500 0.770±0.254 2.000±0.254
Zero Ohm Chip Resistors (LRJ) Electrical Specifications
Type Power Rating at 70°C Max. Rating Current (A)* Resistance (mΩ) Operating Temperature °C
LRJ1206 1 70.7 < 0.2 -55~+150°C
LRJ2512 2 100 < 0.2
LRJ2817 3 122 < 0.2
LRJ2725 4 140 < 0.2
LRJ4527 5 158 < 0.2
  • Note: Rating Current I= ( P / R ) or Max. Rating Current whichever is lower.
  • Special tolerance and range of resistance are under requested.
Zero Ohm Chips (LRJ) Recommend Land Pattern
Zero Ohm Chips (LRJ) Recommend Land Pattern
Zero Ohm Chips (LRJ) Recommend Land Pattern
Type Maximum Power Rating (Watts) Dimensions (Unit: mm)
a b i
LRJ1206 1 1.00 1.90 1.40
LRJ2512 2 2.11 3.68 3.18
LRJ2817 3 2.45 4.60 3.11
LRJ2725 4 2.34 6.86 3.00
LRJ4527 5 3.40 8.74 6.43
Reel Specifications (LRJ) (Unit: mm)
Reel Specifications Dimensions
Reel Dimensions (Unit: mm)
Reel Type / Tape W M A B C D
7” reel for 8 mm embossed
(LRJ1206 series only)
12.00± 0.5 178 ± 1.0 2.0 ± 0.5 13.2 ± 0.5 17.7 ± 0.5 60.0 ± 0.5
7” reel for 12 mm embossed
LRJ2512, LRJ2725, LRJ2817
16.2 ± 0.5 178 ± 1.0 2.5 ± 0.5 13.5 ± 0.5 17.7 ± 0.5 60.0 ± 0.5
7” reel for 24 mm embossed
(LRJ4527 series only)
24.4 +2/-0 178 ± 1.0 2.0 ± 0.5 13.2 ± 0.5 17.7 ± 0.5 60.0 ± 0.5

Emboss Plastic Tape Specifications (LRJ) (Unit: mm)
Emboss Plastic Tape Specifications
Emboss Plastic Tape Specifications (Unit: mm)
Type A±0.1 B±0.1 W±0.3 E±0.1 F±0.1 P0±0.1 P1±0.3 P2±0.1 ΦD0±0.05 ΦD1±0.1 T±0.1
LRJ1206 2.03 3.55 8.0 1.75 3.5 4.0 4.0 2.0 1.55 1.00 1.00
LRJ2512 3.50 6.75 12.0 1.75 5.5 4.0 4.0 2.0 1.55 1.55 0.90
LRJ2725 6.81 7.16 12.0 1.75 5.5 4.0 8.0 2.0 1.55 1.55 1.05
LRJ2817 4.60 7.50 12.0 1.75 5.5 4.0 8.0 2.0 1.55 1.55 1.20
LRJ4527 7.38 12.0 24.0 1.75 11.5 4.0 12.0 2.0 1.55 1.55 1.05
  1. The cumulative tolerance of 10 sprockets hole pitch is ± 0.2mm.
  2. Carrier camber shall be not more than 1mm per 100mm through a length of 250mm.
  3. A & B measured 0.3mm from the bottom of the packet
  4. T measured at a point on the inside bottom of the packet to the top surface of the carrier.
  5. Pocket position relative to sprocket hole is measured as the true position of the pocket and not the pocket hole.

Packaging Quantity (LRJ)
Type Tape Width Diameter Piece/Reel
LRJ1206 8 mm/embossed plastic 178 mm/7” 5,000
LRJ2512 12 mm/embossed plastic 178 mm/7” 4,000
LRJ2725 12 mm/embossed plastic 178 mm/7” 2,000
LRJ2817 12 mm/embossed plastic 178 mm/7” 1,000
LRJ4527 24 mm/embossed plastic 178 mm/7” 1,000
Derating Curve (LRJ)
Derating Curve (LRJ)

Soldering Condition (Reflow Only) (LRJ)
Soldering Condition (Reflow Only) (LRJ)
Environmental Characteristics (LRJ)
Item Requirement Test Method
Short Time Overload
≤0.2 mΩ
JIS C 5201-1 4.13
4 times rated power duration: 5secs.
Load Life
≤0.2 mΩ
JIS-C5201-1 4.25
70±2°C, RCWV for 1000 Hrs. with 1.5 Hrs. “ON” and 0.5 Hr. “OFF”
Bias Humidity
≤0.2 mΩ
JIS-C5201-1 4.24
+85°C/85%RH for 1,000Hrs. with 1.5Hrs “ON”, 0.5Hr “OFF”.
High Temperature Exposure (Storage)
≤0.2 mΩ
JIS-C5201-1 4.23.2
+150°C for 1000 Hrs.
Solderability
95% Min. coverage
JIS-C5201-1 4.17
245±5°C for 3 seconds
Temperature Cycling
≤0.2 mΩ
JIS-C5201-1 4.19
-55°C ~ 150°C, 100 cycles
Order Codes (LRC)
LRJ 1206 TR T R000
Product Type
LRJ
Dimensions (L×W) (mm)
1206 3.20×1.65
2512 6.35×3.05
2817 7.10x4.20
2725 6.80x6.35
4527 11.30x6.60
Package
TR Taping Reel
Power Rating
T 1W
S 2W
R 3W
4 4W
5 5W
Resistance (Ω)
R000 < 0.20mΩ