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MLO (Multilayer Organic Substrate)

What is an MLO and which test stages and products is it used for?

Multilayer Organic (MLO) boards are specially designed multilayer substrates used as interposers in probe cards, particularly within Vertical Probe Card structures. They serve fan-out and signal buffering functions, ensuring that test signals are transmitted stably and optimally to the device under test. In IC testing, MLOs must support high frequencies, a large number of I/Os, and complex routing within a very limited area, placing stringent requirements on substrate manufacturing, material selection, and simulation design capabilities.

Why Choose iST for Multilayer Organic (MLO) Boards?

  • What can iST do for you

    Are you facing these challenges: struggling to find a supplier willing to take on small-volume customized boards? Fan-out interposers are too complex to balance lead time and quality? Probe card designs are reaching higher frequencies, but the board often causes signal interference?

    Many MLO board suppliers impose strict limitations on small-volume, diverse requirements. High NRE costs and long production cycles often discourage customers. iST offers a one-stop Engineering Substrate design and fabrication service and has successfully applied MLO in probe card interposer structures.

    Through customized design and streamlined process management, iST can support you from design, simulation, fabrication to verification, providing a complete, one-stop solution.

    Process StageServices Provided by iST
    Design
    		Engineering parameter recommendations, SI/PI simulation & verification, routing suggestions
    Material SelectionMultilayer board structure design, high-frequency low-loss material matching
    Fabrication & AssemblyPCB + MLO integration, SMT, reflow soldering, probe card assembly
    Inspection &VerificationFlying probe testing, X-ray inspection, 3D warpage measurement, microstructure analysis

iST’s Competitive Edge in Burn-in Board Design

1

Custom Design, Overcoming Low-Volume, High-Variety Limitations
Supports high I/O multilayer structures, fine-pitch, and high-density designs with no minimum

2

Shortened Fabrication Lead Time
Streamlines the traditional Multilayer Organic (MLO) board process, combining high-efficiency fabrication and engineering management to significantly reduce prototyping and delivery time.

3

Turnkey Service
Provides full-process integration services for PCB + and MLO, including SMT, reflow, X-ray, and flying probe testing, minimizing integration errors and ensuring stable quality.

4

Comprehensive Verification Platform
Offers various substrate verification services for finished products, such as warpage measurement, 3D X-ray inspection, and bending tests, ensuring quality control and improving measurement reliability.

  • Application Scope
  • Product Types

Types of Multilayer Organic Substrates (MLO) and Their Application Scenarios

TypeApplication Scenario
Vertical Probe Card
MEMS probing, automotive IC testing, high-frequency small-pitch designs
Fan-out Interposer StructureMulti-die integration, interposer packaging
Engineering SubstrateNPI customization, low-volume/high-mix processes, module verification

MLO

MLO-Integrated Test Board

Contact Window | Ms. Lin / Aaliyah | Tel:+886-3-5799909#8890 | Email:HWBU_Sales@istgroup.com

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