How to evaluate and select PCBA suppliers?

Clarify Your Own Needs First (The First Step of Supplier Selection)

1. Order Attributes: Multi-variety/small and medium batch/prototype trial production/repeated design revisions

2. Product Working Conditions: High-voltage drive/humid and salt-spray environment/water treatment equipment/export-oriented industrial control boards/with high requirements for reliability/aging resistance/moisture protection and three-proof coating.

3. Core Bottom Lines: Pass pre-production DFM review, material safety, full traceability, and clear positioning of after-sales defects

4. Procurement Priorities: Ultra-low price / fast lead time / stable quality / in-depth understanding of complete machine logic collaboration

Five Core Screening Dimensions (From Most to Least Important)

1. Supply Chain & Material Risk Control (The Biggest Pain Point in Your Industry)

• Verify formal agency channels, ability to avoid refurbished parts, dismantled parts and overpriced loose materials; check for complete incoming material inspection

• Check if pre-production DFM review is provided: package checking, obsolete material early warning, pin conflict detection, BOM optimization

• Small-batch supporting capability: ability to fully source materials for hundreds of pcs orders, no random material replacement or unauthorized material modification

• Standardized material batch management and anti-mixing warehousing to avoid hidden defects of resistors and capacitors

2. Production Process & Hardware Matching

• Basic configuration: Complete equipment of SPI, AOI and X-Ray; capability to detect soldering voids of high-power boards, BGAs and fine-pitch components

• Special process capabilities: Three-proof coating, selective wave soldering, high-voltage isolation, thick copper processing, moisture-proof and aging testing

• Mass production experience in high-power and high-voltage boards; familiarity with vulnerable points of MOS tubes and drive circuits, and awareness of risks in salt-spray and humid working conditions

• Availability of MES production traceability system, enabling review of reflow temperature, production line and batch for defective products

3. Delivery Capacity & Production Scheduling Rules

• Capacity evaluation before order acceptance, no random order taking or unrealistic lead time promises

• Friendly line change for small-batch orders, no malicious high charges for setup and line change fees

• Possession of self-owned production lines; be cautious of factories outsourcing PCB production, post-soldering and testing extensively, which leads to uncontrollable quality

• Transparent urgent order process with no hidden premium charges

4. Engineering Communication & Technical Understanding (The Most Easily Overlooked Point)

• Not just pure SMT mounting; capability to understand drive logic and hardware principles, and cooperate in design revisions and circuit optimization

• Stable engineering communication team with low staff turnover; ability to identify BOM risks and layout defects in advance

• Support for prototype debugging and failure analysis; ability to find root causes of defects instead of simple rework only

5. Commerce, Confidentiality & After-Sales Service

• Transparent quotation: Clear breakdown of stencil fees, engineering fees, material loss, post-soldering and testing costs, no arbitrary price increase in later stage

• NDA-based drawing confidentiality and BOM data management to prevent core solution leakage

• Sound after-sales mechanism: Compensation and rework plans for batch defects and hidden faults, no responsibility shifting

Six Red Lines to Quickly Eliminate Inferior PCBA Factories

• Refuse to provide material sources and arbitrarily replace components without authorization

• No DFM review, start production directly upon receiving design files

• Only equipped with AOI, no SPI or X-Ray, but undertake high-power and high-voltage board orders

• Extremely low initial quotation with various hidden charges in later stage

• Engineering team lacks basic circuit knowledge and only provides pure SMT mounting services

GreenPCBA is a small-medium run PCB assembly company providing one-stop contract electronic assembly services.GreenPCBA is also focus on cost-effective high quality PCBA.We fully know the core pains in PCBA industry,we pay a lot of attentions to these industry pain points. We built up a very strict components suppliers evaluation system since we set up in 2011,throughout the years since its establishment, we has continuously optimized this system to make sure the components&material supply chain security without refurbished parts and dismantled parts.we have also IQC to complete incoming material inspection. In the meanwhile our Oracle ERP system helps to control all the materials in this system,it helps anti-mixing warehousing a lot. To give customer cost effective solution, we normally suggest equivalent parts for the components,we only provide material sources and arbitrarily replace components with customer’s authorization, we would send all the suggestive parts list to customer to check, there is no random material replacement or unauthorized material modification. Pre-production DFM review is very important for new project,we have a strong engineering team who can use english to communicate with customer directly, the have capability to understand drive logic and hardware principles, and cooperate in design revisions and circuit optimization,the can identify BOM risks and layout defects in advance,Support for prototype debugging and failure analysis;able to find root causes of defects instead of simple rework only.

For more information, visit www.greenpcba.com or contact our expert team at reby@greenpcba.com.