The UM8511 is a (L-C) low pass filter array with integrated TVS diodes. It is designed to suppress unwanted EMI signals and provide electrostatic discharge (ESD) protection in portable electronic equipment. This device utilizes solid-state silicon-avalanche technology for superior clamp­ing performance and DC electrical characteristics. It has been optimized for protection of signal lines in cellular phones and other portable electronics.

The device consists of identical circuits comprised of TVS diodes for ESD protection, and a C-L-C network for EMI filtering. A typical inductor value of 17nH and a capacitor value of 12pF are used to achieve 19dB minimum attenuation from 800MHz to 2.7GHz. The TVS diodes provide effective suppression of ESD voltages in excess of ±15kV (air discharge) and ±8kV (contact discharge) per IEC 61000-4-2, level 4.

The UM8511 is in a RoHS compli­ant DFN16 3.3×1.3 package. The leads are finished with lead-free. The small pack­age makes it ideal for use in portable electronics such as cell phones, digital still cameras, and PDAs.

 

 

- Bidirectional EMI Filter with Integrated TVS for ESD Protection

- ESD Protection to IEC 61000-4-2 (ESD) Level 4, ±15kV (Air), ±8kV (Contact)

- Filter Performance: 19dB Minimum Attenuation from 800MHz to 2.7GHz

- TVS Working Voltage: 5V

- Inductor: 17nH (Typical)

- Capacitors: 12pF (Typical at V_R=2.5V)

- Protection and Filtering for Multi Lines

  UM8511: Eight Lines
 

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
TVS Reverse Stand-Off Voltage	VRWM				5	V
TVS Reverse Breakdown Voltage	VBR	IT=1mA	6	8	10	V
TVS Reverse Leakage Current	IR	VRWM=3.3V			0.1	μA
DC Resistance	Rcc			10		Ω
Filter Cut-Off Frequency	fc	Zsource=Zload=50Ω		250		MHZ
Inductance	L			17		nH
Capacitance	Cd	VR=2.5V, f=1MHz		12		pF
Total Capacitance	Ctotal	Input to GND, Each Line VR=2.5V, f=1MHz	19	24	29	pF
Stop Band Attenuation		800MHz to 2.7GHz		19		dB