What type material should be used in PCB ??

[kabaleevisu]

Hi everyone,
i need some clarification about PCB Selection Material.what are the type of PCB Material is available (in IPC Standard) ??
How to choose the PCB Material for Particular design Like Analog ,Digital ,High speed design and RF design ??
what are the property i need to consider while choosing the PCB Material in My design ? why ??
please any one reply for this queries

 

[leochou0714]

Dear Kapil,

I think for normal PCB, use FR4 is good.
But for the Analog ,Digital ,High speed design and RF design , it is better you use Rogers, Taconic,Arlon.
And some time even BT material from MITSUBISHI is essential.
Hope this is useful for you.

Best Regards
Leo Chou
Account Manager in Founding Circuits Company

 

[D.A.(Tony)Stewart]

A transition material between low-cost FR4 (epoxy-fiberglass) and expensive Teflon [Rogers] is Polyamide (PA) looks like FR4 epoxy but with lower loss polyamide mixed in ( GETEK by GE is one brand).

PA is suitable for 1GHz and possibly more with specs. Loss tangent is 10x better at only 25% higher cost and slightly lower dielectric constant at 1GHz than rating at 100MHz is suitable for multi-layer.

There many other dielectric materials including high K "buried capacitance" for power & ground layers for distributed capacitance

... and aluminum substrate with printed copper and epoxy solder mask for power LEDs and MOSFETs

If you have IPC specs or supplier with conformance to IPC specs, be sure you follow all the design rules.

Every supplier has different price, quality and capability. All must be good.

Sometimes capability is split into 3 commercial categories ( outside R&D or military)

Product Features	Standard	Advanced	MicroElectronics or HDI .00125" track&gap
PC Board Attributes
Min Layer count	1	1	1
Max Layer Count	24	26+	26+
Min Board Thickness	.010"	.004"	.004"
Max Board Thickness	.200"	.200" +	.200" +
Min Core Thickness	.002"	.002"	.002"
Min Dielectric	.002"	.001"	.001"
Min. Starting Copper Foil Weight	9 micron	3 micron	3 micron
Max. Finished Copper Thickness (O/L)	6 oz	> 6 oz	.0015"
Max. Finished Copper Thickness (I/L)	4 oz	> 4 oz	.001"
Maximum Panel Size	21" x 29"	21" x 29"	12" x 18"
Minimum Panel Size	12" x 18"	12" x 18"	8" x 8"
Smallest Mech Drill Diameter	.0059"	.004"	.004"
Smallest Laser Drill Diameter	.0030" / .0080"	.0025" / .0100"	.0025" / .0100"
Min Finished Hole Size	.004"	.002"	Plated shut
Max Thru Hole Aspect Ratio	10:1	16:1	16:1
Max Blind Via Aspect Ratio	.75:1	1.2:1	.8:1
Blind Via Finished Hole Size	.004"	Plated shut	Plated shut
Buried Via Finished Hole Size	.004"	.002"	.002"
Minimum Line Width (trace) and Spacing	.003"	.002"	.00125"
Min Pad Size for test	.005"	.003"	.003"
Process Pad Diameter	D + .012" (1 mil annular ring)	D + .010" (Tangency)	D + .006"
Stacked vias	Yes	Yes	Yes
Minimum Wire Bond Pad size	> .006"	.004"	0.0025"
Controlled Impedance Tolerance	10%	5%	5%
Solder Mask Registration	.002"	<.002"	.002"
Solder Mask Feature Tolerance	.001"	.001"	.001"
Solder Mask Min Dam Size	.004"	.002"	.002"
Min. Diameter Rout Cutter Available	.024"	.021"	.021"
Routed Part Size Tolerance	.010"	<.010"	<.010"
Laser hole location Tolerance	.0005"	.0005"	.0005"
Laser Routed Part Size Tolerance - can only be done with panels <.032" thick	.001"	.001"	.001"
Bow & Twist Tolerance	7%	<7%	<7%
Thickness Tolerance	10%	< 10%	< 10%
Sequential Lam	2 or less lam cycles	> 3 lam cycles	> 3 lam cycles
Buried Vias	2 or less	> 3	> 3
Blind Vias	Yes	Yes	Yes
Conductive Filled Vias	Yes	Yes	Yes - Cu plate shut
Non Conductive Filled Vias	Yes	Yes	Yes
Surface Finishes
HASL (Vertical or Horizontal)	Yes	Yes	No
Lead Free HASL	Yes	Yes	No
OSP (Shikoku F2)	Yes	Yes	Yes
OSP (Entek)	Yes	Yes	Yes
ENIG (Electroless Nickel/Immersion Gold)	Yes	Yes	Yes
ENEPIG (Electroless Nickel-Electroless Paladium-Immersion Gold)	Yes	Yes	Yes
Immersion Silver	Yes	Yes	Yes
Tin Nickel	Yes	Yes	No
Electrolytic Soft Gold	Yes	Yes	Yes
Electrolytic Hard Gold	Yes	Yes	Yes
Selective Gold	Yes	Yes	Yes
Solder Masks
Semi - Gloss Green	Yes	Yes	Yes
Gloss Green	Yes	Yes	Yes
Matte - Green	Yes	Yes	Yes
Black	Yes	Yes	Yes
Red	Yes	Yes	Yes
Blue	Yes	Yes	Yes
Yellow	Yes	Yes	Yes
Legend
All colors	Yes	Yes	Yes
Fab
Routed Array	Yes	Yes	Yes
V Score, Edge to Copper	0.01"	0.007"	0.007"
V Score Angles	35°,45°,60°	35°,45°,60°	35°,45°,60°
Countersink	Yes	Yes	Yes
Counterbore	Yes	Yes	Yes
Bevel	Yes	Yes	Yes
Milling	+/- .003"	+/- .003"	+/- .001"
Edge Castellation	Yes	Yes	Yes
Edge Plating	Yes	Yes	Yes
Heatsinks	Yes	Yes	No
Electrical Test
10 Volt	Yes	Yes	Yes
40 Volt (Burn in bds)	Yes	Yes	Yes
250 Volt	No	Yes	Yes
500 Volt	No	Yes	Yes
Hi Pot	No	Yes	No
Laminate Materials
Very Thin Film	No	Yes	Yes
Arlon 85NT	Yes	Yes	No
Hybrid Constructions	Yes	Yes	Yes
Isola FR406	Yes	Yes	Yes
Isola FR408	Yes	Yes	Yes
Isola IS410	Yes	Yes	Yes
Isola IS620	No	Yes	No
Isola P95	Yes	Yes	Yes
Isola P96	Yes	Yes	Yes
Matsushita R1766	Yes	Yes	Yes
Matsushita R1755	Yes	Yes	No
Matsushita Megtron	Yes	Yes	No
Nelco N4000-13 (SI)	Yes	Yes	Yes
Nelco N4000-6 FC	Yes	Yes	Yes
Nelco N4000-29	Yes	Yes	No
Neltec N7000-2	Yes	Yes	Yes
No Flow Pre Preg	Yes	Yes	Yes
Polyclad PCL370HR	Yes	Yes	Yes
Polyclad Getek	Yes	Yes	Yes
PSA Bond Film	No	Yes	Yes
Rogers 3000	Yes	Yes	No
Rogers R4003	Yes	Yes	No
Rogers R4350	Yes	Yes	No
Rogers 5880	Yes	Yes	No
Rogers 6000	Yes	Yes	No
Rogers TMM	Yes	Yes	No
Available Reports
Microsection	Yes	Yes	Yes
Solderability	Yes	Yes	Yes
X-ray Fluorescence	Yes	Yes	Yes
Ionic Contamination	Yes	Yes	Yes
Time Domain Reflectometry test (TDR)	Yes	Yes	Yes
FAI	Yes	Yes	Yes
Certificate of Compliance (C of C)	Yes	Yes	Yes

 

[kabaleevisu]

Hi sunny,
Thanks for your reply.how can choose dielectrical material or core materiral depends on application ?? For analog and digital board or Power board material will be very right ?? so which factor should i follow to choosing dielectrical material for design (analog ,digital ,High speed more then 1 GHZ)

 

[rube]

Deal kapil,
Generally speaking, FR-4 is ok, if multilayer board used high TG FR-4 is better(above 6L); For RF board ,if you board have microstrip filter or sensitive to characteristic impedance shoud use low dielectric loss materals like Rogers; For high speed design, if your PCB etch line not long, FR-4 is ok，Otherwise other depends on your simulation.

 

[marce]

For most designs unless you are doing advanced more esoteric designs then a good grade of FR4 will suffice, with a suitable Tg rating. We rarely specify anything other than FR4,FR4 is good up to GHz range