Table of Contents
Typical PCB Assembly Lead Times
Here’s a general breakdown of typical lead times for PCB assembly:
| Assembly Type | Lead Time |
|---|---|
| Prototype Assembly | 1–5 working days |
| Low-Volume Production | 5–10 working days |
| Medium to High Volume | 10–20 working days or more |
| Turnkey with Component Sourcing | 10–25 working days |
Note: Lead times refer to PCB assembly only, not including PCB fabrication or shipping.
Factors That Affect PCB Assembly Time
The predictability of delivery cycles is critical, affecting project planning and product launches. Understanding these factors is essential.
1. PCB Fabrication Time
- Standard PCBs: 2–7 business days
- Complex/multi-layer boards: 7–15 business days
Pro Tip: Opt for a one-stop fabrication + assembly service to minimize coordination delays.
2. Component Availability
This is one of the biggest delays in the PCB assembly process.
- In-stock parts: Immediate processing.
- Out-of-stock or long-lead items: Adds 5–15+ days.
Solution:
- Provide all parts yourself (consigned/kitted orders).
- Use an assembly partner with a strong supply chain network.
- Approve alternates (cross-part numbers) in advance.
3. Assembly Complexity
The more complex your board, the longer the assembly:
| Factor | Impact |
|---|---|
| Double-sided SMT | Adds 1–2 days |
| Mixed technology (SMT + THT) | Adds 2–5 days |
| BGA / Fine-pitch ICs | Requires additional inspection time |
| Conformal coating / Special processing | Adds several days |
4. Testing & Inspection
Before delivery, product testing is mandatory, including functional testing, ICT (online testing), or AOI/X-ray inspection, etc. These tests may extend delivery times, but they are typically crucial for quality assurance and guarantee product reliability.
5. Order Volume
Assembling 5 prototype boards is faster than assembling 1,000 production units. Bulk orders require scheduling, equipment setup, and quality assurance.
Prototype orders (1–10 pcs) can be done in as little as 1–3 days, especially with express options.
Bulk production may take 2-3 weeks or longer, depending on factory capacity.
How to Speed Up Your PCB Assembly Time
To minimize turnaround time, you can take the following practical measures:
1. Use a turnkey PCB assembly supplier.
They handle all processes in one place, including manufacturing, procurement, and assembly.
2. Submit complete and clear documentation.
This includes BOM (bill of materials), Gerber files, pick-and-place files, and assembly drawings.
3. Use off-the-shelf components.
Avoid using parts that are difficult to source or outdated. You can check the supplier’s inventory in advance or seek alternative products.
4. Request a Design for Manufacturability (DFM) review.
This helps identify issues before production begins, avoiding repeated delays.
5. Communicate your deadlines.
Many assembly factories offer expedited services—sometimes same-day or 24-hour assembly—but these come at an additional cost.
FAQs
1. Can PCB assembly be completed in 24 hours?
Yes, but only for simple circuit boards with complete components and fast service. Please consult your assembler to see if they offer same-day or 24-hour assembly services.
2. What’s the difference between fabrication and assembly?
Manufacturing is the process of producing bare PCBs (physical circuit boards). Assembly is the process of placing and soldering components onto the circuit board.
3. Does PCB assembly time include component sourcing?
Not always. Many PCB assemblers list lead times based on receiving all parts. If you need a turnkey service, component sourcing can add time.
4. What if my design changes after placing the order?
Any design revision during or after fabrication can reset the clock. It’s critical to finalize your design before submitting.
5. Can I supply my parts?
Yes. This is called consignment assembly. Depending on the labeling, sorting, and transportation of parts, it can shorten or lengthen the construction period.
6. What is the fastest way to get my PCBs assembled?
- Choose an assembly house with in-house fabrication and component inventory
- Use common, in-stock parts
- Request express service
- Provide error-free documentation
PCB assembly times may vary. However, good planning and a reliable manufacturing partner will help your project run smoothly.
If you need help speeding up your project or would like to receive a quote with accurate turnaround times, please feel free to contact us.