WLTM

WLTM LITTELFUSE | Alldatasheet

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Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series Littelfuse WLTM Series low ohm current sense resistor is designed with long term stability in mind. This series is durable, excels at heat dissipation. The small package is optimal for most applications.

Description

■ Low TCR ■ Optimal linearity in I / V conversion ■ Ceramic substrate ■ Small size Features and Benefits ■ Power management ■ Low Equivalent Series Inductance (ESL) Application RoHS Pb Resources Accessories Samples Additional Information

Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series Electrical Specifications Part Number Size Resistance Value Power Rating (W) TCR (ppm / ºC) Standard Package QuantityInch mm Ro (mΩ) Rt (%) WLTM0508RLR003FNR 0508 1220 3 ±1 .0% 1 ±50 5000 WLTM0508RLR005FNR 0508 1220 5 ±1 .0% 1 ±50 5000 WLTM0508RLR006FNR 0508 1220 6 ±1 .0% 1 ±50 5000 WLTM0508QLR010FNR 0508 1220 10 ±1 .0% 1 ±50 5000 WLTM0508QLR012FNR 0508 1220 12 ±1 .0% 1 ±50 5000 WLTM0508QLR020FNR 0508 1220 20 ±1 .0% 1 ±50 5000 WLTM0612QLR005FNR 0612 1632 5 ±1 .0% 1. 5 ±100 5000 WLTM0612QLR006FNR 0612 1632 6 ±1 .0% 1. 5 ±100 5000 WLTM0612QLR007FNR 0612 1632 7 ±1 .0% 1. 5 ±100 5000 WLTM0612QLR010FNR 0612 1632 10 ±1 .0% 1. 5 ±50 5000 WLTM0612QLR012FNR 0612 1632 12 ±1 .0% 1. 5 ±50 5000 WLTM0612QLR015FNR 0612 1632 15 ±1 .0% 1. 5 ±50 5000 WLTM0612QLR016FNR 0612 1632 16 ±1 .0% 1. 5 ±50 5000 WLTM0612QLR020FNR 0612 1632 20 ±1 .0% 1. 5 ±50 5000 WLTM0612QLR039FNR 0612 1632 39 ±1 .0% 1. 5 ±50 5000 WLTM0612QLR100FNR 0612 1632 100 ±1 .0% 1. 5 ±50 5000 WLTM0815QLR010FYR 0815 2238 10 ±1 .0% 2 ±50 4000 WLTM0815RLR005FYR 0815 2238 5 ±1 .0% 2 ±100 4000 WLTM0815RLR006FYR 0815 2238 6 ±1 .0% 2 ±100 4000 WLTM1020QLR010FYR 1020 2550 10 ±1 .0% 2 ±50 4000 WLTM1225QLR010FYR 1225 3264 10 ±1 .0% 3 ±50 4000 WLTM1225QLR015FYR 1225 3264 15 ±1 .0% 3 ±50 4000 WLTM1225QLR020FYR 1225 3264 20 ±1 .0% 3 ±50 4000 WLTM1225QLR022FYR 1225 3264 22 ±1 .0% 3 ±50 4000 WLTM1225QLR030FYR 1225 3264 30 ±1 .0% 3 ±50 4000 WLTM1225QLR039FYR 1225 3264 39 ±1 .0% 3 ±50 4000 WLTM1225QLR100FYR 1225 3264 100 ±1 .0% 3 ±50 4000 WLTM1225RLR002FYR 1225 3264 2 ±1 .0% 3 ±100 4000 WLTM1225RLR004FYR 1225 3264 4 ±1 .0% 3 ±100 4000 WLTM1225RLR006FYR 1225 3264 6 ±1 .0% 3 ±100 4000 Note: Resistors are available in steps of 1mOhm. Ratings not indicated in the above table may be available on request.

Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series Temperature De-rating Curve Storage / Environment Conditions Time Temperature TP TL TS(max) TS(min) tP tL tS time to peak temperature PreheatPreheat Ramp-upRamp-up Ramp-downRamp-dow Critical Zone TL to TP Critical Zone TL to TP Profile Feature Pb-Free Assembly Average Ramp-Up Rate (Tsmax to Tp) 3 ºC / second max Preheat Temperature Minimum (Tsmin) 150 ºC Temperature Maximum (Tsmax) 200 ºC Time (Tsmin to (Tsmax) 60–180 seconds Time maintained above Temperature Minimum (TL) Time (tL) 217 ºC 60–150 seconds Peak T emperature (TP) 260 +0 ºC Time within 5 ºC of Actual Peak T emperature (tp) 20–40 seconds Ramp-Down Rate 6 ºC / second Maximum Time 25 ºC to Peak T emperature 8 minutes Maximum Soldering Parameters–Reflow Soldering Products should be stored under the following environmental conditions. T emperature: +5 to +35 °C Humidity: 45 to 85% relative humidity Moisture Sensitivity Level: 1, J-STD-020 Do not keep products in environments where they may be subject to particulate contamination or harmful gases such as sulfuric acid or hydrogen chloride as it may cause oxidization on electrodes, resulting poor solderability. Products should be stored in a space that does not expose to high temperatures, vibration, or direct sunlight. Products should be stored in the original airtight packaging until use. -55 0 100 Ambient Temperature (ºC) Rated Power (%) 70 80 120 155

Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series T est Procedure Specifications ESD HBM, 100 pF , 1 .5 k ohms Repetition: 5 times Component Classification: 5 C (25 kV) ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Load Life (Operational Life) Test Temperature: 125 °C Applied voltage: rated power (derated Power will be required if temp exceeds the derating point of part) Test Period: 1,000 hours (condition D) ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Biased Humidity Test conditions: 85 °C and 85% RH 10% of rated power Test Period 1,000 hours ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. T emp. Cycling (Thermal Shock) Repeat 1,000 cycles as follows: -55 °C for 30 minutes 125 °C for 30 minutes Transition time of 1 minute max ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. High T emp. Exposure (Storage) Test Temp 125 °C Test Period: 1,000 hours No Electrical Load ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Resistance to soldering heat Condition B (Solder dip, no pre-heat) 260 °C ±1 .0% Parts must meet initial electrical specs. Resistance to Solvents 3 minute soak 2–3 ounce force 10 strokes/repetition 3 repetitions Appearance: Without distinct damage, and the marking shall be legible. T erminal Strength (SMD) Applied force based on part size ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Flammability UL -94 V-0 or V-1 are acceptable Electrical test not required V-0 burning less that 10 seconds V-1 burning less than 30 seconds Flame Retardance Mounted parts subjected to voltages from 9.0 to 32 VDC (current clamped up to 500 A) No flame when full automotive battery potential is applied. Vibration Frequency: 10–2,000 Hz Acceleration: 5G Test duration: 20 minutes, 12 cycles ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Mechanical Shock Force: 100G peak Test duration: 6 ms Half-sine waveform Velocity: 12.3 ft/sec ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Board Flex 90 mm span between fulcrums 2 mm bend 60 seconds minimum holding time ±1 .0% Appearance: Without distinct damage, and the marking shall be legible. Solderability Non-activated flux dip: 5–10 seconds SAC solder dip: 5 seconds at 245 °C A new solder shall cover minimum of 95%. Reliability Specifications

Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series Dimensions Product Construction Recommended Land Pattern All dimensions in mm Part Number W L T A Number Description

1 Substrate (Alumina Ceramic)

2 Adhesion Layer (Epoxy)

3 Resistive Element (Cu Alloy Foil)

4 Terminal Electrode (Cu, Ni, Sn)

5 Protective Coating (Flame-retardant epoxy, UL -94-V0)

6 Marking* (Flame-retardant epoxy, UL -94-V0)

WLTM0508 R001~R100 0.60 mm 2.30 mm 1 .10 mm 1 .0 W WLTM0612 R001 0.50 mm 3.68 mm 1 .35 mm 1 .5 W WLTM0612 R002~R100 0.60 mm 3.68 mm 1 .30 mm 1 .5 W WLTM0815 R001~R100 0.70 mm 4.26 mm 1 .45 mm 2.0 W WLTM1020 0M50 0.55 mm 5.75 mm 2.48 mm 2.0 W WLTM1020 R001~R100 1 .00 mm 5.75 mm 2.25 mm 2.0 W WLTM1225 R001~R100 1 .40 mm 7 .25 mm 2.35 mm 3.0 W RXXX 4 1 2 3 5 Sn Ni Cu Note: * Marking is three digits (XXX) 0508 case size, and four digits (RXXX) for all other case sizes.

Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series Part Numbering System Packaging Part Number Halogen Free Packaging Option Quantity Quantity & Packaging Codes WLTM0508 Ye s Tape and Reel 5000 NR WLTM0612 Ye s Tape and Reel 5000 NR WLTM0815 Ye s Tape and Reel 4000 YR WLTM1020 Ye s Tape and Reel 4000 YR WLTM1225 Ye s Tape and Reel 4000 YR WLTM 0612 R L R001 F N R Series Quantity Code Tolerance Code Packaging CodeSize TCR Resistance Value Code Littelfuse Surface Mount CSR N = 5,000 Y = 4,000 P = 2,000 H = ±3% F = ±1% D = ±0.5% R = Tape and Reel Long side electrode Q = ±50 ppm °C, R = ±100 ppm °C, G = ±150 ppm °C

Current Sense Resistor Datasheet © 2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BT.05/14/24 Two-Terminal Surface Mount Resistor WLTM Series Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at http://www.littelfuse.com/disclaimer-electronics. Tape and Reel Specifications Part Number A±5 (mm) N±2 (mm) W1±1 (mm) WLTM0508 178 60 9.0 WLTM0612 178 60 9.0 WLTM0815 178 60 13 WLTM1020 178 60 13 WLTM1225 178 60 13 Part Number W P0 P P2 A0 B0 D0 F E T T1 K0 Part Number W P0 P P2 A0 B0 D0 F E T T1 K0