电子说
在电子设计领域,电阻作为基础且关键的元件,其性能直接影响着整个电路的稳定性和可靠性。今天,我们来深入了解YAGEO推出的AC系列厚膜贴片电阻,这是一款专为汽车级应用打造的高性能电阻产品。
文件下载:AC0201JR-0768RL.pdf
YAGEO的AC系列厚膜贴片电阻,涵盖了0201/0402/0603/0805/1206/1210/1218/2010/2512等多种尺寸规格,提供±5%、±1%、±0.5%的精度选择。该系列产品符合RoHS标准且无卤,适用于各种通用应用场景,尤其在汽车电子和工业应用中表现出色。
AC系列电阻的全球部件编号由系列名称、尺寸、公差、包装类型、温度系数、卷带尺寸和电阻值等信息组成。具体编码规则如下:
例如,订购一个AC0402芯片电阻,阻值为100KΩ,公差为±1%,采用7英寸卷带包装,其订购代码为:AC0402FR - 07100KL。
不同尺寸的AC系列电阻有不同的标记方式:
AC系列电阻采用汽车级陶瓷基体,内部金属电极位于两端,通过电阻釉连接。电阻釉上覆盖有保护玻璃,通过调整釉的成分和激光微调来实现所需的电阻值。整个元件还覆盖有保护外涂层,尺寸为0603及以上的电阻会在顶部标记电阻值。最后,添加两个外部端接(Ni/哑光锡)。
| 其具体尺寸如下表所示: | TYPE | L (mm) | W (mm) | H (mm) | I1 (mm) | I2 (mm) |
|---|---|---|---|---|---|---|
| AC0201 | 0.60±0.03 | 0.30±0.03 | 0.23±0.03 | 0.12±0.05 | 0.15±0.05 | |
| AC0402 | 1.00 ±0.05 | 0.50 ±0.05 | 0.32 ±0.05 | 0.20 ±0.10 | 0.25 ±0.10 | |
| AC0603 | 1.60 ±0.10 | 0.80 ±0.10 | 0.45 ±0.10 | 0.25 ±0.15 | 0.25 ±0.15 | |
| AC0805 | 2.00 ±0.10 | 1.25 ±0.10 | 0.50 ±0.10 | 0.35 ±0.20 | 0.35 ±0.20 | |
| AC1206 | 3.10 ±0.10 | 1.60 ±0.10 | 0.55 ±0.10 | 0.45 ±0.20 | 0.40 ±0.20 | |
| AC1210 | 3.10 ±0.10 | 2.60 ±0.15 | 0.55 ±0.10 | 0.45 ±0.15 | 0.50 ±0.20 | |
| AC1218 | 3.10 ±0.10 | 4.60 ±0.10 | 0.55 ±0.10 | 0.45 ±0.20 | 0.40 ±0.20 | |
| AC2010 | 5.00 ±0.10 | 2.50 ±0.15 | 0.55 ±0.10 | 0.55 ±0.15 | 0.50 ±0.20 | |
| AC2512 | 6.35 ±0.10 | 3.10 ±0.15 | 0.55 ±0.10 | 0.60 ±0.20 | 0.50 ±0.20 |
不同类型的AC系列电阻具有不同的电气特性,包括工作温度范围、最大功率、介电电压、温度系数等。例如,1/16W的电阻工作温度范围为 - 55°C至155°C,最大工作电压为50V或100V,温度系数为±200ppm/°C等。具体的电气特性可参考产品规格表。
不同尺寸的电阻在70°C时的额定功率如下:
直流或交流(rms)连续工作电压可通过公式 (V = sqrt{(P × R)}) 计算,或者取最大工作电压中的较小值。其中,V为连续额定直流或交流(rms)工作电压(V),P为额定功率(W),R为电阻值(Ω)。
| 为确保产品质量和性能,AC系列电阻经过了多项严格测试,包括高温暴露、耐湿性、偏置湿度、使用寿命、抗焊接热、热冲击、静电放电、可焊性、板弯曲、电阻温度系数、短时过载和硫测试等。具体测试条件、程序和要求如下表所示: | TEST | TEST METHOD | PROCEDURE | REQUIREMENTS |
|---|---|---|---|---|
| High Temperature Exposure | AEC - Q200 Test 3 MIL - STD - 202 Method 108 | 1,000 hours at TA = 155 °C, unpowered | ± (1.0% + 0.05 Ω ) for D/F tol ± (2.0% + 0.05Ω) for J tol <50 mΩ for Jumper | |
| Moisture Resistance | AEC - Q200 Test 6 MIL - STD - 202 Method 106 | Each temperature / humidity cycle is defined at 8 hours (method 106F), 3 cycles / 24 hours for 10d. with 25 °C / 65 °C 95% R.H, without steps 7a & 7b, unpowered | ± (0.5% + 0.05Ω) for D/F tol ± (2.0% + 0.05Ω) for J tol <100 mΩ for Jumper | |
| Biased Humidity | AEC - Q200 Test 7 MIL - STD - 202 Method 103 | 1,000 hours; 85 °C / 85% RH 10% of operating power Measurement at 24 ± 4 hours after test conclusion. | ± (1.0% + 0.05Ω) for D/F tol ± (3.0% + 0.05Ω) for J tol <100 mΩ for Jumper | |
| Operational Life | AEC - Q200 Test 8 MIL - STD - 202 Method 108 | 1,000 hours at 125 °C, derated voltage applied for 1.5 hours on, 0.5 hour off, still - air required | ± (1.0% + 0.05Ω) for D/F tol ± (3.0% + 0.05Ω) for J tol <100 mΩ for Jumper | |
| Resistance to Soldering Heat | AEC - Q200 Test 15 MIL - STD - 202 Method 210 | Condition B, no pre - heat of samples Lead - free solder, 260 ± 5 °C, 10 ± 1 seconds immersion time Procedure 2 for SMD: devices fluxed and cleaned with isopropanol | ± (0.5% + 0.05Ω) for D/F tol ± (1.0% + 0.05Ω) for J tol <50 mΩ for Jumper No visible damage | |
| Thermal Shock | AEC - Q200 Test 16 MIL - STD - 202 Method 107 | - 55/+125 °C Number of cycles is 300. Devices mounted Maximum transfer time is 20 seconds. Dwell time is 15 minutes. Air – Air | ± (0.5% + 0.05Ω) for D/F tol ± (1.0% + 0.05Ω) for J tol <50 mΩ for Jumper | |
| ESD | AEC - Q200 Test 17 AEC - Q200 - 002 | Human Body Model, 1 pos. + 1 neg. discharges 0201: 500V 0402/0603: 1KV 0805 and above: 2KV | ± (3.0% + 0.05 Ω ) <50 m Ω for Jumper | |
| Solderability | AEC - Q200 Test 18 | Electrical Test not required Magnification 50X | ||
| - Wetting | J - STD - 002 | SMD conditions: (a) Method B, aging 4 hours at 155 °C dry heat, (b) Method B, steam aging 8 hours, dipping at (c) Method D, steam aging 8 hours, dipping at dipping at 235 ± 3 °C for 5 ± 0.5 seconds. 215 ± 3 °C for 5 ± 0.5 seconds. 260 ± 3 °C for 7 ± 0.5 seconds. | Well tinned (≥95% covered) No visible damage | |
| Board Flex | AEC - Q200 Test 21 AEC - Q200 - 005 | Chips mounted on a 90mm glass epoxy resin PCB (FR4) Bending for 0201/0402: 5 mm Holding time: minimum 60 seconds 0603/0805: 3 mm 1206 and above: 2 mm | ± (1.0% + 0.05Ω) <50 mΩ for Jumper | |
| Temperature Coefficient of Resistance (T.C.R.) | MIL - STD - 202 Method 304 | At +25/–55 °C and +25/+125 °C Formula: T.C.R = ------------------------- × 10 6 (ppm/°C) Where t1 = +25 °C or specified room temperature t2 = –55 °C or +125 °C test temperature R1 = resistance at reference temperature in ohms R2 = resistance at test temperature in ohms R1 (t2 – t1) R2 – R1 | Refer to table 2 | |
| Short Time Overload | IEC60115 - 1 4.13 | 2.5 times of rated voltage or maximum overload voltage whichever is less for 5 sec at room temperature | ± (1.0% + 0.05Ω) for D/F tol ± (2.0% + 0.05Ω) for J tol <50 mΩ for Jumper | |
| FOS | ASTM - B - 809 - 95 | Sulfur (saturated vapor) 500 hours, 60 ± 2 ℃, unpowered | ± ( 1.0% + 0.05Ω) |
| AC系列电阻提供纸质卷带(R)和压纹卷带(K)两种包装方式,不同尺寸和卷带尺寸对应的包装数量如下表所示: | PACKING STYLE | REEL DIMENSION | AC0201 | AC0402 | AC0603 | AC0805 | AC1206 | AC1210 | AC1218 | AC2010 | AC2512 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Paper taping reel (R) | 7" (178 mm) | 10,000 | 10,000 | 5,000 | 5,000 | 5,000 | 5,000 | --- | --- | --- | |
| 10" (254 mm) | 20,000 | 20,000 | 10,000 | 10,000 | 10,000 | 10,000 | --- | --- | --- | ||
| 13" (330 mm) | 50,000 | 50,000 | 20,000 | 20,000 | 20,000 | 20,000 | --- | --- | --- | ||
| Embossed taping reel (K) | 7" (178 mm) | --- | --- | --- | --- | --- | --- | 4,000 | 4,000 | 4, |
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