SNJ54F153J - TEXAS INSTRUMENTS - Datasheet.Directory

April, 2013 − Rev. 2

1Publication Order Number:

NUF6401/D

NUF6401, SNUF6401

6-Channel EMI Filter with

Integrated ESD Protection

The NUF6401MN is a six−channel (C−R−C) Pi−style EMI filter

array with integrated ESD protection. Its typical component values of

R = 100  and C = 17 pF deliver a cutoff frequency of 110 MHz and

stop band attenuation greater than −30 dB from 800 MHz to 3.0 GHz.

This performance makes the part ideal for parallel interfaces with

data rates up to 74 Mbps in applications where wireless interference

must be minimized. The specified attenuation range is very effective

in minimizing interference from 2G/3G, GPS, Bluetooth® and

WLAN signals.

The NUF6401MN is available in the low−profile 12−lead 1.35 mm

x 3.0 mm DFN12 surface mount package.

Features/Benefits

•±15 kV ESD Protection on each channel (IEC61000−4−2 Contact

Discharge)

•R/C Values of 100  and 17 pF deliver Exceptional S21 Performance

Characteristics of 110 MHz f3dB and −30 dB Stop Band Attenuation

from 800 MHz to 3.0 GHz

•Integrated EMI/ESD System Solution in DFN Package Offers

Exceptional Cost, System Reliability and Space Savings

•S Prefix for Automotive and Other Applications Requiring Unique

Site and Control Change Requirements; AEC−Q101 Qualified and

PPAP Capable

•These are Pb−Free Devices

Applications

•EMI Filtering for LCD and Camera Data Lines

•EMI Filtering and Protection for I/O Ports and Keypads

Figure 1. Electrical Schematic

See Table 1 for pin description

Cd = 17 pF Cd = 17 pF

R = 100 

Filter + ESDnFilter + ESDn

−45

−40

−35

−30

−25

−20

−15

−10

−5

1.0E+6 10E+6 100E+6 1.0E+9 10E+9

FREQUENCY (Hz)

S21 (dB)

Figure 2. Typical Insertion Loss Characteristic

DFN12

CASE 506AD

MARKING

DIAGRAM

Device Package Shipping†

ORDERING INFORMATION

NUF6401MNT1G DFN12

(Pb−Free)

3000 / Tape &

Reel

http://onsemi.com

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

6401= Specific Device Code

M= Month

G= Pb−Free Package

(Note: Microdot may be in either location)

SNUF6401MNT1G DFN12

(Pb−Free)

3000 / Tape &

Reel

NUF6401, SNUF6401

http://onsemi.com

Figure 3. Pin Diagram

4321

(Bottom View)

9101112 8 7

GND

Table 1. FUNCTIONAL PIN DESCRIPTION

Filter Device Pins Description

Filter 1 1 & 12 Filter + ESD Channel 1

Filter 2 2 & 11 Filter + ESD Channel 2

Filter 3 3 & 10 Filter + ESD Channel 3

Filter 4 4 & 9 Filter + ESD Channel 4

Filter 5 5 & 8 Filter + ESD Channel 4

Filter 6 6 & 7 Filter + ESD Channel 4

Ground Pad GND Ground

MAXIMUM RATINGS

Parameter Symbol Value Unit

ESD Discharge IEC61000−4−2 Contact Discharge VPP 15 kV

DC Power per Resistor PR100 mW

DC Power per Package PT600 mW

Operating Temperature Range TOP −40 to 105 °C

Storage Temperature Range TSTG −55 to 150 °C

Maximum Lead Temperature for Soldering Purposes (1.8 in from case for 10 seconds) TL260 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

ELECTRICAL CHARACTERISTICS (TJ = 25°C unless otherwise noted)

Parameter Symbol Test Conditions Min Typ Max Unit

Maximum Reverse Working Voltage VRWM 5.0 V

Breakdown Voltage VBR IR = 1.0 mA 6.0 7.0 V

Leakage Current IRVRWM = 3.0 V 100 1000 nA

Resistance RAIR = 10 mA 85 100 115 

Diode Capacitance CdVR = 2.5 V, f = 1.0 MHz 17 20 pF

Line Capacitance CLVR = 2.5 V, f = 1.0 MHz 34 40 pF

3 dB Cut−Off Frequency (Note 1) f3dB Above this frequency,

appreciable attenuation occurs

110 MHz

6 dB Cut−Off Frequency (Note 1) f6dB Above this frequency,

appreciable attenuation occurs

175 MHz

1. 50  source and 50  load termination.

NUF6401, SNUF6401

http://onsemi.com

TYPICAL PERFORMANCE CURVES (TA= 25°C unless otherwise specified)

−80

−70

−60

−50

−40

−30

−20

−10

10E+6 100E+6 1.0E+9 10E+9

FREQUENCY (Hz)

S41 (dB)

−45

−40

−35

−30

−25

−20

−15

−10

−5

1.0E+6 10E+6 100E+6 1.0E+9 10E+9

FREQUENCY (Hz)

S21 (dB)

Figure 4. Typical Insertion Loss Characteristic

REVERSE VOLTAGE (V)

NORMALIZED CAPACITANCE

0.5

1.5

012345

100

102

104

106

108

110

−40 −20 0 20 40 60 8

TEMPERATURE (°C)

RESISTANCE ()

Figure 5. Typical Analog Crosstalk

Figure 6. Typical Capacitance vs.

Reverse Biased Voltage

(Normalized Capacitance, Cd @ 2.5 V)

Figure 7. Typical Resistance over Temperature

NUF6401, SNUF6401

http://onsemi.com

Theory of Operation

The NUF6401MN combines ESD protection and EMI

filtering conveniently into a small package for today’s size

constrained applications. The capacitance inherent to a

typical protection diode is utilized to provide the

capacitance value necessary to create the desired frequency

response based upon the series resistance in the filter. By

combining this functionality into one device, a large number

of discrete components are integrated into one small

package saving valuable board space and reducing BOM

count and cost in the application.

Application Example

The accepted practice for specifying bandwidth in a filter

is to use the 3 dB cutoff frequency. Utilizing points such as

the 6 dB or 9 dB cutoff frequencies results in signal

degradation in an application. This can be illustrated in an

application example. A typical application would include

EMI filtering of data lines in a camera or display interface.

In such an example it is important to first understand the

signal and its spectral content. By understanding these

things, an appropriate filter can be selected for the desired

application. A typical data signal is pattern of 1’s and 0’s

transmitted over a line in a form similar to a square wave.

The maximum frequency of such a signal would be the

pattern 1-0-1-0 such that for a signal with a data rate of

100 Mbps, the maximum frequency component would be

50 MHz. The next item to consider is the spectral content of

the signal, which can be understood with the Fourier series

approximation of a square wave, shown below in

Equations 1 and 2 in the Fourier series approximation.

From this it can be seen that a square wave consists of odd

order harmonics and to fully construct a square wave n must

go to infinity. However, to retain an acceptable portion of the

waveform, the first two terms are generally sufficient. These

two terms contain about 85% of the signal amplitude and

allow a reasonable square wave to be reconstructed.

Therefore, to reasonably pass a square wave of frequency x

the minimum filter bandwidth necessary is 3x. All

ON Semiconductor EMI filters are rated according to this

principle. Attempting to violate this principle will result in

significant rounding of the waveform and cause problems in

transmitting the correct data. For example, take the filter

with the response shown in Figure 8 and apply three

different data waveforms. To calculate these three different

frequencies, the 3 dB, 6 dB, and 9 dB bandwidths will be

used.

Equation 1:

x(t) +1

2)2





n+1ƪ1

2n *1sin((2n *1)0t)ƫ(eq. 1)

Equation 2 (simplified form of Equation 1):

x(t) +1

2)2

ƪsin(0t)

1)sin(30t)

3)sin(50t)

5) AAAƫ(eq. 2)

Magnitude (dB)

Frequency (Hz)

100k 1M 100M 1G 10G

10M

Figure 8. Filter Bandwidth

−3 dB

−6 dB

−9 dB

From the above paragraphs it is shown that the maximum

supported frequency of a waveform that can be passed

through the filter can be found by dividing the bandwidth by

a factor of three (to obtain the corresponding data rate

multiply the result by two). The following table gives the

bandwidth values and the corresponding maximum

supported frequencies and the third harmonic frequencies.

NUF6401, SNUF6401

http://onsemi.com

Table 2. Frequency Chart

Bandwidth Maximum Supported

Frequency

Third Harmonic

Frequency

3 dB –

100 MHz

33.33 MHz (f1)100 MHz

6 dB –

200 MHz

66.67 MHz (f2)200 MHz

9 dB –

300 MHz

100 MHz (f3)300 MHz

Considering that 85% of the amplitude of the square is in

the first two terms of the Fourier series approximation most

of the signal content is at the fundamental (maximum

supported) frequency and the third harmonic frequency. If a

signal with a frequency of 33.33 MHz is input to this filter,

the first two terms are sufficiently passed such that the signal

is only mildly affected, as is shown in Figure 9a. If a signal

with a frequency of 66.67 MHz is input to this same filter,

the third harmonic term is significantly attenuated. This

serves to round the signal edges and skew the waveform, as

is shown in Figure 9b. In the case that a 100 MHz signal is

input to this filter, the third harmonic term is attenuated even

further and results in even more rounding of the signal edges

as is shown in Figure 9c. The result is the degradation of the

data being transmitted making the digital data (1’s and 0’s)

more difficult to discern. This does not include effects of

other components such as interconnect and other path losses

which could further serve to degrade the signal integrity.

While some filter products may specify the 6 dB or 9 dB

bandwidths, actually using these to calculate supported

frequencies (and corresponding data rates) results in

significant signal degradation. To ensure the best signal

integrity possible, it is best to use the 3 dB bandwidth to

calculate the achievable data rate.

Figure 9. Input and Output Waveforms of Filter

Input Waveform Output Waveform

a) Frequency = f1

b) Frequency = f2

c) Frequency = f3

NUF6401, SNUF6401

http://onsemi.com

PACKAGE DIMENSIONS

DFN12 3.0x1.35, 0.5P

CASE 506AD

ISSUE J

NOTES:

1. DIMENSIONING AND TOLERANCING PER

ASME Y14.5M, 1994.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION b APPLIES TO PLATED

TERMINAL AND IS MEASURED BETWEEN

0.25 AND 0.30 MM FROM TERMINAL.

4. COPLANARITY APPLIES TO THE EXPOSED

PAD AS WELL AS THE TERMINALS.

5. EXPOSED PADS CONNECTED TO DIE FLAG.

USED AS TEST CONTACTS.

DIM MIN MAX

MILLIMETERS

A0.80 1.00

A1 0.00 0.05

A3 0.20 REF

b0.18 0.30

D3.00 BSC

D2 2.10 2.30

E1.35 BSC

E2 0.20 0.40

e0.50 BSC

K0.20 −−−

L0.20 0.40

0.15 C

2 X

12 X

(A3)

0.15 C

PIN ONE

REFERENCE

0.08 C

0.10 C

SEATING

PLANE

BOTTOM VIEW

12X

0.10 B

0.05

12X

SIDE VIEW

TOP VIEW

NOTE 3

712

NOTE 5

EXPOSED Cu

(A3)

0.2 X 0.25 MM

EXPOSED PAD

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

DETAIL A

EDGE OF PACKAGE

OPTIONAL

CONSTRUCTION

DETAIL A

L1 0.00 0.15

2.352

0.093

ǒmm

inchesǓ

SCALE 16:1

0.265

0.010

0.479

0.019

0.351

0.014

0.199

0.008

0.500

0.020

Pitch

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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

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USA/Canada

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Phone: 421 33 790 2910

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Phone: 81−3−5817−1050

NUF6401/D

Bluetooth is a registered trademark of Bluetooth SIG.

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