收藏本站
CM1216
APPLICATION INFORMATION
Design Considerations
In order to realize the maximum protection against ESD pulses, care must be taken in the PCB layout to minimize parasitic
series inductances on the Supply/Ground rails as well as the signal trace segment between the signal input (typically
a connector) and the ESD protection device. Refer to Application of Positive ESD Pulse between Input Channel and Ground,
which illustrates an example of a positive ESD pulse striking an input channel. The parasitic series inductance back to the power
supply is represented by L 1 and L 2 . The voltage V CL on the line being protected is:
V CL = Fwd voltage drop of D 1 + V SUPPLY + L 1 x d(I ESD ) / dt + L 2 x d(I ESD ) / dt
where I ESD is the ESD current pulse, and V SUPPLY is the positive supply voltage.
An ESD current pulse can rise from zero to its peak value in a very short time. As an example, a level 4 contact discharge
per the IEC61000 ? 4 ? 2 standard results in a current pulse that rises from zero to 30 Amps in 1 ns. Here d(I ESD )/dt can be
approximated by D I ESD / D t, or 30/(1x10 ? 9 ). So just 10 nH of series inductance (L 1 and L 2 combined) will lead to a 300 V
increment in V CL !
Similarly for negative ESD pulses, parasitic series inductance from the V N pin to the ground rail will lead to drastically
increased negative voltage on the line being protected.
The CM1213 has an integrated Zener diode between V P and V N . This greatly reduces the effect of supply rail inductance
L 2 on V CL by clamping V P at the breakdown voltage of the Zener diode. However, for the lowest possible V CL , especially when
V P is biased at a voltage significantly below the Zener breakdown voltage, it is recommended that a 0.22 μ F ceramic chip
capacitor be connected between V P and the ground plane.
As a general rule, the ESD Protection Array should be located as close as possible to the point of entry of expected
electrostatic discharges. The power supply bypass capacitor mentioned above should be as close to the V P pin of the Protection
Array as possible, with minimum PCB trace lengths to the power supply, ground planes and between the signal input and the
ESD device to minimize stray series inductance.
Additional Information
See also ON Semiconductor Application Note, “Design Considerations for ESD Protection”, in the Applications section.
L 1
POSITIVE SUPPLY
PATH OF ESD CURRENT PULSE (IESD)
C 1
D 1
ONE
CHANNEL
D 2
CHANNEL
INPUT
LINE BEING
PROTECTED
SYSTEM OR
CIRCUITRY
BEING
PROTECTED
GROUND RAIL
CHASSIS GROUND
Figure 2. Application of Positive ESD Pulse between Input Channel and Ground
http://onsemi.com
4
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
CM1220-08CP TVS ARRAY ESD PROT 8CH 10CSP
CM1223-02SR TVS ARRAY ESD LOW 2CH SOT143-4
CM1224-02SR TVS ARRAY ESD LOW 2CH SOT143-4
CM1225-04DE TVS ARRAY ESD LOW PROT 4CH 10DFN
CM1230-04CP TVS ARRAY ESD LOW PROT 4CH CSP6
CM1231-02SO DIODE ESD CLAMP 2CH SOT23-6
CM1233-08DE DIODE ESD CLAMP ARRAY 8CH 16WDFN
CM1234-08DE IC ESD PROTECT ARRAY HS 16TDFN
相关代理商/技术参数
CM1216-06MS 制造商:CALMIRCO 制造商全称:California Micro Devices Corp 功能描述:6- and 8-Channel Low Capacitance ESD Arrays
CM1216-06SM 功能描述:ESD 抑制器 6 Channel ESD Array P2 Fused RoHS:否 制造商:STMicroelectronics 通道:8 Channels 击穿电压:8 V 电容:45 pF 端接类型:SMD/SMT 封装 / 箱体:uQFN-16 功率耗散 Pd: 工作温度范围:- 40 C to + 85 C
CM1216-06SN 制造商:CALMIRCO 制造商全称:California Micro Devices Corp 功能描述:6- and 8-Channel Low Capacitance ESD Arrays
CM1216-08MR 功能描述:ESD 抑制器 8 Channel ESD Array RoHS:否 制造商:STMicroelectronics 通道:8 Channels 击穿电压:8 V 电容:45 pF 端接类型:SMD/SMT 封装 / 箱体:uQFN-16 功率耗散 Pd: 工作温度范围:- 40 C to + 85 C
CM1216-08MS 制造商:CALMIRCO 制造商全称:California Micro Devices Corp 功能描述:6- and 8-Channel Low Capacitance ESD Arrays
CM1218 制造商:CALMIRCO 制造商全称:California Micro Devices Corp 功能描述:Low Capacitance Transient Voltage Suppressors / ESD Protectors
CM1218-02S7 功能描述:TVS二极管阵列 2-ch. ESD Protection RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C
CM1218-02SC 制造商:CALMIRCO 制造商全称:California Micro Devices Corp 功能描述:Low Capacitance Transient Voltage Suppressors / ESD Protectors