Mil-spec PCBs

Sierra Circuits is qualified by the US Department of Defense to MIL-PRF-55110, MIL-PRF-31032/1, MIL-PRF-31032/2 for GF (FR4) and GI (Polyimide) Printed Circuit Boards.

Sierra Circuits has an extended history of manufacturing High-Reliability printed circuit boards to MIL-PRF-55110, MIL-PRF-31032/1, MIL-PRF-31032/2 for GF (FR4). We have in-house capability to provide Group A testing that is required for Mil-Spec PCB boards.

Our Mil-spec PCB customers include companies like NASA, Jet Propulsion Labs (JPL), Lockheed Martin, L3 Communications, and Naval Research Labs.

Mil-spec PCB Capabilities

(Capabilities include the following, but are not limited to it. Call us for your special needs at 1-800-763-7503 x 500)

Specification

MIL-PRF-55110, MIL-PRF-31032/1, MIL-PRF-31032/2

Technology

Materials

FR4 and Polyimide

Board Type

Rigid PCBs

Max. Number of Layers

24

Max. Panel Size

18"x24"

Max. Board Thickness (inches)

0.125"

Min. Drilled PTH (before plating)

0.0079

Min. Laser Ablated Plated Hole (before plating)

0.0053"

Max Aspect Ratio (pth)

12:1

Max Aspect Ratio (microvia)

0.7 : 1

Min. Conductor Width (inches)

0.003"

Min. Conductor Space (inches)

0.003"

Hole Preparation

Plasma Etchback

Hole Wall Conductive Coating

Electroless Copper

Copper Plating

Periodic Reverse Plate

Hole Fill / Via Plug

Non-conductive

Laser Via fill

Copper / plated shut

Finish System

HAL / ENIG

Controlled Impedance

Single-Ended and/or Differential

Controlled Tolerance

+/-10% & +/-5%

Pitch

Min .5 mm

Lamination

Max Lamination Cycles

1

Max Layers

24

Min Dielectric

As per spec

Max Thickness

0.125"

Overall Thickness

+/- 10%

Bow & Twist W/SMD

As per spec

Bow & Twist WO/SMD

As per spec

Drill and Routing

Hole Location

.004"

Tolerance (PTH)

+/- .003"

Tolerance (NPTH)

+/- .002"

Min Drill Size

.006"

Min Pad

FHS + .014"

Min Plane Relief

FHS + .025"

Etch Factors

Inner Layer

+ .0005"

Outer Layer

+ .0005"

SMT and Through Hole

Imaging

.003"/.003"

Min Line/Space

.008" min

Surface Mt Pad

+/- .002"

Layer to Layer Reg

1

Solder Mask

Solder Resist

Liquid Photoimageable

Min Clearance

.002" /side

Min Lay Down

.004"

Color

Clear, Black, Red, Blue, White, Purple, etc.

Nomenclature

Min Line

.005"

Color

White, Black, Yellow, etc.

Call today to speak with an Account Representative at 1-800-763-7503 x 500.

To get a quote submit your gerber files to www.protoexpress.com/customquote