Bean | PCB & PCBA Manufacturing CN

Helping hardware teams ship reliable boards faster 🚀
▸ DFM & Stackup consulting
▸ 48h prototype → mass production
👇 Free DFM review for your next project

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

BGA joint failures? 5 design fixes:

1. Epoxy-filled capped vias under BGA
2. IPC-7351 pad sizing
3. NSMD pads for stronger joints
4. Thermal relief on large copper pours
5. No tall parts shielding BGA during reflow

Full details in infographic 👇

#BGA #PCBDesign

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

PCB surface finish quick guide:

🔹 HASL: cheapest, not for fine pitch
🔹 ENIG: best for BGA, flat, 2x cost
🔹 OSP: low cost, flat, short shelf life
🔹 Immersion Tin: great for press-fit, whisker risk
Auto/medical default: ENIG.

#PCB

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@a2e1534 Good call doing prototypes first — op-amp noise and stability can surprise you on the first spin. What's your target quantity for the prototype run?

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

4-layer PCB stackup cheat sheet:

1️⃣ SIG-GND-PWR-SIG: general purpose
2️⃣ GND-SIG-SIG-GND: high-speed, best EMI
3️⃣ SIG-GND-SIG-PWR: mixed-signal

Rule: always pair signal with adjacent ground. Which do you use? 👇

#PCBDesign

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

PCB testing: Flying probe vs bed of nails.

🔹 Flying probe: no fixture, best for prototypes, 2-5 min/board
🔹 Bed of nails: custom fixture, best for volume, ~10 sec/board

We use flying probe for prototypes, bed of nails for volume. 100% nets tested.

#PCB

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

Inside our factory: AOI line in action.

Every board gets 100% AOI — catches solder bridges, missing parts, misalignment, tombstoning.

Full report with every batch. Quality isn't an add-on.

#PCB #QualityControl

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

When choosing a PCB manufacturer, what matters most to you?

Vote 👇

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

5 DFM mistakes to avoid:

1. Annular rings <0.15mm → cracked pads
2. Silkscreen on pads → poor solderability
3. Copper <0.3mm from edge → exposed copper
4. Unfilled via-in-pad → BGA voids
5. No fiducials → SMT misalignment

Save this list 📌

#PCBDesign #DFM

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

Hi, I'm Bean — PCB/PCBA Technical Sales/Consultant in Shenzhen.

I help hardware teams ship reliable boards faster, from 24h prototypes to mass production.

Certification: IATF 16949, ISO 14001, ISO 9001, UL

Sharing DFM tips & factory insights here. Let's connect 👇

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@Peter05704721 Powered on first try — nice! Screwdriver as a switch is classic prototyping 😄
When you iterate to V3, hit me up for free DFM + quote — FPV boards are our specialty. Would love to earn the next spin.

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@Peter05704721 V2 looks way cleaner! Quick heads-up before you order — AI-routed boards often miss basic DFM. If you haven't placed it yet, I can run a free check + quote in hours. Even if you have, save me for V3 😄

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@blind_via Looking forward to it! Via quality makes or breaks high-reliability boards. We do automotive/medical multilayer with full impedance + AOI testing — if you ever need a manufacturing partner for your designs, happy to quote. Keep us posted!

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@QVHenkel Definitely publish — old designs are great learning material and someone might even revive them. Quick one: how's the smartwatch mainboard coming? Almost ready to send for fab?

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@paolodiprodi @i2cjak Perfect! Could you just zip the Gerbers and email to my email ([email protected])? I'll run DFM and send a prototype quote within 24h — gives you everything to compare before sending to PCBWay. Way easier than GitHub too.

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@a2e1534 Stencil + reflow is the right call for test batches. Pro tip: 0.9x aperture on QFN48 stencil helps with bridges. When you move to SMT production, hit me up for a quote — we do a lot of STM32 boards. Good luck with testing!

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@SamuelBeek KiCad is solid — handmade means you know every trace on that board 😄 How's bring-up going? Already spotting anything that'll need a revision spin?

[Bean | PCB & PCBA Manufacturing CN @MrBeanDou]

@463n7_57 CERBERUS looks slick! Nice batch. Are you hand assembling these or using a PCBA service? Small runs with ESP32 modules are always tricky for yield.