ALMJ25

Description

ALMJ25

  • Proprietary processing technique produces extremely low resistance values
  •  Very low inductance 
  •  Low thermal EMF
  •  Metallic Material

 Part Numbering System

ALMJ25

Parameter   Standard
Power Rating 3 W
Resistance Value 0.5 mΩ
Operating Temperature Range -55to~ +170°C
Temperature Coefficient (TCR) 100 ppm/°C
Maximum Working Voltage(V) (P × R) 1/2
Rating Current(A) (P ÷ R) 1/2

Standard Electrical Specifications

Type Power Rating at 70℃ T.C.R. (ppm/℃) Resistance Range (mΩ) ±0.5%(D) ±1.0%( F)   ±2.0%( G)  ±5.0%( J) Material Electrode Operating Temperature (℃)
ALMJ25 3W 100 0.5 Alloy Wide -55 ~ +170°C

Construction

ALMJ25

ALMJ25

 

Unit: Millimeters

Style Resistance (mΩ) T Material
ALMJ25 0.5 6.4 ±0.2 3.2 ±0.2 2.5 ±0.2 0.9 ±0.20 MnCu

Recommended land pattern

 

ALMJ25

Resistance Range (mΩ) a b L
0.5 4.0±0.1 3.1±0.1 1.3±0.1

Power Derating Curve

For resistors operated in ambient temperatures 70°C, power ratingshall bederated inaccording with the curve below:

ALMJ25

Recommended Solder Curve

ALMJ25

Reflow Condition   Pb – Free assembly
Pre heat   -Temperature Min (Ts(min)) 150°C
-Temperature Max (Ts(max)) 200°C
- Time (Min to Max) (ts) 60 – 120 secs
Average ramp up rate(Liquidus Temp (TL) to peak 5°C/second max
TS(max) to TL - Ramp-up Rate 5°C/second max
Reflow   -Temperature (TL) (Liquidus) 217°C
- Temperature (tL) 60 – 150 seconds
Peak Temperature (TP) 260°C
Time within 5°C of actual peak Temperature (tp) 20 – 40 seconds
Ramp-down Rate 5°C/second max
Time 25°C to peak Temperature (TP) 8 minutes Max.
Wave Soldering 260°C, 10seconds max.
Hand Soldering 350°C, 5 seconds max.

 Product Characteristics

Item Test Condition / Methods Limited Standard
Resistance Measuring resistance value at room temperature 25℃±5℃ Refer to Spec IEC60115-1 4.5
Temperature Coefficient of Resistance (TCR) TCR =(R-R0)/R0(T2-T1)X 106 R0 : resistance of room temperature R: resistance of 125℃ T1: Room temperature T2: Temperature at 125℃ Refer to Spec MIL-STD-202 Method 304
Short Time Overload Apply  overload for  5  seconds  and  measure  the resistance change rate after standing for 24 hours. 5 times the rated power for 5 seconds ≤±0.5% MIL-R-26E
Resistance to Soldering Heat 260℃± 5℃ time :10sec± 1sec ≤±0.5% MIL-STD-202 Method 210
Temperature Cycling -55℃ (15min)/+150℃(15min), 1000 cycles ≤±0.5% MIL-STD-202 Method 107G
Low Temperature Storage -55±2℃ for 96 hours, no power ≤±0.5% MIL-R-26E
High Temperature Storage 170℃ for 1000 hours, no power ≤±1% IEC60115-1 4.25
Bias Humidity +85℃, 85% RH ,10%bias, 1000hours ≤±0.5% MIL-STD-202 Method 103
Solderability 245±5℃ , 3±1sec At least 95% of     surface area of     electrodeshall be covered with new solder IEC60115-1-4.17 / JIS-C5201-4.17
Operational Life 70℃± 2℃, 1000 hours, at rated power 1.5 hours “ON”, 0.5 hours “OFF” ≤±1% MIL-STD-202 Method 108
Terminal Strength Weld it into the bending test plate, place it on the bending test machine, apply 2.5kg force in thecenter of the test plate, press 2mm under the load for 60s, and measure the resistance change rate. ≤±0.5% JIS-C5201-1 4.32

Tapping & Package

ALMJ25

Type Pack A ±0.2 B ±0.2 D0 +0.5-0 E ±0.1 F ±0.05 P0 ±0.1 P1 ±0.1 P2 ±0.1 W ±0.2 D1 ±0.05 T ±0.15
2512 Emboss 3.60 6.90 1.50 1.75 5.50 4.00 4.00 2.00 12.00 1.50 1.20

Reel Specification

ALMJ25

Type A
2512 2.00±0.5 13.50±0.5 21.00±0.5 60.00±1.0 178.00±2.0 13.80±0.5

Packaging

Quantity: 4, 000pcs

8mm wide tape on 178mm(7 inch) 

diameter reel -specification EIA

Standard 481.

Peel strength of upper belt

Stripping speed: 300 mm / min; The peel force is between 0.1N and 0.7n.

ALMJ25

Storage conditions & shelf life

It can be stored for 2 years under closed conditions with temperature of 5 ° C ~ 35 ° C and relative humidity of 40 ~ 75

Please avoid the following harsh environment during storage to avoid affecting the productperformance and solder connectivity: the places with corrosive gases such as sea breeze, Cl2, H2S, NH3, SO2 and NO2 shall be stored without direct sunlight.

Precautions for product use

When measuring the resistance value before welding, a special resistance meter with high precision shall be used. When measuring, a 4-wire probe or fixture must be used. 4. When measuring parts with a wire    measuring needle, the 4 measuring needles must indeed contact the parts.

Avoid damaging the protective layer during manual welding or clamping with tweezers.

When the PCB is divided or fixed on the support, be careful to avoid excessive bending causing mechanical stress to the resistor.

It shall be used within the rated power range within the specification, especially when the power exceeds the rated value, which may affect the reliability of the product

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