Product Class : Fixed Resistor·Wire Wound Resistor
★ Standard
▲Fixed resistor used in electronic equipment part 1:Generic specification
▲Q/RU103-1995 Type RX21 power wire-wound resistor specification
▲Q/RU104-1995 Type RX25 power wire-wound resistor specification
▲Q/RU160-1999 Type RX710 power precision wire-wound resistor specification
▲Basic environment test procedure ★ Main Specification Type | Rated power at 70℃
(W) | Resistor range
(Ω) | Resistance tolerance
±(%) | TCR
±(×10-6/℃) | Limit voltage
(V) | Insulation voltage
(DC or AC peak value)
(V) | RX21 | 0.5 | 1~510 | ≥10Ω
2(G),5(J),10(K)
≥1Ω
5(J),0(K)
<1Ω
10(K) | R>10Ω
250
5Ω≤R≤10Ω
500
R<5Ω
No stipulation | No applicability | No applicability | 1 | 0.15~3K | 2~3 | 0.15~4.3K | 4 | 0.15~10K | | 5 | 0.15~1K | 6 | 0.15~15K | 8 | 0.15~20K | 10 | 0.15~22K | 12 | 0.15~33K | RX710 | 1 | 0.1~1.40K | 51Ω<R≤12.4KΩ C(±0.25%)
D(±0.5%) F(±1%)
10Ω<R≤12.4KΩ
D(±0.5%) F(±1%)
1Ω<R≤12.4KΩF(±1%)
0.1Ω～1Ω
±0.01Ω | 100
<10Ω Nostipulation
(supported by material) | No applicability | No applicability | 2 | 0.1~1.69K | 3 | 0.1~4.02K | 5 | 0.1~12.4K | RX25 | 3 | 1~100 | ≤10Ω10(K)
>10Ω5(J),10(K) | 250 | No applicability | No applicability |
★ Main inspection items, methods & requirements
Type RX21 & RX25 Items | Requirements | Methods | TCR | ±250×10-6/℃(RX25)
R>10Ω ±250×10-6/℃(RX21)
R=5Ω~10Ω ±500×10-6/℃(RX21) | -55℃/20℃ 20℃/155℃ | Endurance at room temperature | ΔR≤±(5%R+0.1Ω) | Room temperature，1.22VR 1000h | Solderability | Terminal is well covered with solder and the solder can freely flow | 235±5℃ 2±0.5s | Over-load | ΔR≤±(1%R+0.05Ω) | 3.16VR 5s | Terminal strength | ΔR≤±(1%R+0.05Ω) | Tension test | Resistance to soldering heat | ΔR≤±(1%R+0.05Ω) | 350±10℃ 3.5±0.5s | Fast temperature change | ΔR≤±(1%R+0.05Ω) | -55℃/155℃ | Vibration | ΔR≤±(1%R+0.05Ω) | 10Hz~500Hz 98m/s26h | Shock | ΔR≤±(1%R+0.05Ω) | 490m/s211ms | Climate category | ΔR≤±(5%R+0.05Ω) | Xenothermic、cyclic heat of wetting 、cold climate、 low pressure、
cyclic heat of wetting | Temperature rise | 250℃(R×25)
205℃(R×21) | －55℃/20℃ 20℃/155℃ | Endurance at upper-limit temperature | ±(5%R+0.1Ω) | Duration：1000h 155℃ | Occasional over-load | No visual flame | Load 5,10,16 times of rated power | Stability | 5% | | Climate category | 55/155/21 | |
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