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Since our inception over 30 years ago, we at Sierra Assembly Technology Inc. earned the trust of customers by providing complete circuit board assembly services. With our vast industry experience and knowledge, we can take up any project brought forward by our customers. This can include simple single sided, and double sided assemblies, as well as complex PCBs with SMT, PTH, or mixed technologies. Our advanced facility comprising the latest in design, assembly, and testing equipment, helps us to provide custom PCBs known for their quality and durability.

Brief Descriptions of our PCB Assembly Services
Our services are designed to cater to eclectic needs of clients from different industries. With each service, we are able to offer standard and custom solutions, depending on the client’s requirements. All our design, prototyping, and assembly processes adhere to the regulations laid in IPC-A-610, and IS0 13485:2003 certifications.

Box Build Assembly Services

Our box build assemblies comprise protective, electro-magnetic enclosures. These are designed to protect the PCBs from harsh environmental elements, while allowing for easy installation and wire routing.

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pcb for box build
cable and wire

Custom Cable and Wire Harness Assembly

Sierra Assembly’s cable and wire harness assembly services are designed to provide solution driven products, which can enhance the performance and productivity of industrial applications. We can provide custom cable and wire harnesses to meet specific application needs. Our services comprise all processes from development to testing.

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PCB Assembly Services

We at Sierra Assembly provide the complete range of PCB assembly services. We create custom, durable PCBs using our PTH and SMT assembly lines. Our focus is always on quality. The final products are produced according to IPC and RoHS guidelines. We even provide repair services for damaged PCB assemblies.

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PCB Assembly and Production

PCB Design

Sierra Assembly provides eclectic circuit board design & layout services to customers. Whether you wish to create a new PCB assembly, or upgrade an existing assembly, we can create custom solutions to meet all your requirements in terms of power, performance, and durability.

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Quick Turn PCB Assembly and Prototyping

At Sierra Assembly, we consider prototyping a crucial process in PCB assembly. We offer quick turn PCB assembly services to meet the customer’s requirements in terms of product design and performance. With prototyping, we can identify and eliminate defects, ensuring quality design before the product is even sent for assembly.

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quick turn pcb

Quick Contact


I approached Sierra after being referred to them from another PCB designer. What impressed me was that they were more than willing to take a complex PCB requirement. The PCB assembly they provided was small, lightweight, but provided the amount of power needed for our computer product. Great experience.

- Susan R – Business Computer Industry

I liked Sierra’s quick turn PCB assembly services. They provided a prototype within a few days, and it worked without a hitch. I was extremely satisfied with the quality of the PCB. Their prices are great too.

- Jason G. – Telecom Industry

Sierra Assembly Technology has a great group of people to work with. They are open to almost any request and always get the job done quickly. I’ve been in some tight spots before and needed certain products within a small time window, and Sierra has always been reliable.”

- Richard S. – LED Lighting Manufacturer

Your Partner in Southern California for Circuit Board Assembly Services GET A QUOTE

Sierra Assembly Technology Inc.

10880 Mulberry Ave

Fontana, CA 92337

Phone: 909.355.5400