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Card Edge Connector
Industrial, IT Datacom
When you're engineering a compact module — a wireless communication card, a sensor interface board, or a debug header — the connector isn't just another BOM line item. It's the mechanical and electrical bridge that determines whether your product survives field deployment or comes back as an RMA.
The CONSHARE M.2 3.2H 20PIN connector (part CUF036G67M1XX) is engineered around a single principle: give hardware designers a connector that holds up in tight enclosures, maintains clean signal paths, and doesn't become the weak link in the assembly.
The 3.2mm mated height sits in a practical middle ground most engineers overlook until it's too late. Ultra-low-profile connectors (under 2.5mm) struggle with solder joint reliability during reflow — paste volume is so thin that any board warpage creates opens. Taller connectors (5mm+) eat into your enclosure budget and limit what you can stack underneath.
At 3.2mm, you get enough vertical clearance to route signal vias and place decoupling capacitors underneath the mated module. When you're debugging signal integrity on a dense four-layer board, the ability to probe test points beneath the connector area saves hours of rework.
Z-clearance budget: Plan for 3.5–4.0mm total Z-height above the PCB to accommodate the connector body, mated module, and any thermal pad.
Keep-out zones: The SMT pad footprint requires a specific keep-out on both layers beneath the connector — check the pad layout drawing before finalizing your PCB.
Reflow compatibility: The housing is rated for standard lead-free reflow (260°C peak) — no special low-temp processing needed.
Not every M.2 application needs 67 pins. If your module handles a moderate I/O count — a combo wireless card, an NFC interface, or a GNSS positioning module — 20 pins gives you the lanes you need without paying for contacts you'll never use. Fewer pins also means a smaller footprint, translating directly to board real estate savings.
Application Scenario | Why 20 Pins Fits | Design Consideration |
|---|---|---|
Wi-Fi / Bluetooth combo modules | Sufficient for PCIe + USB + UART lanes | Verify key type compatibility |
NFC and RFID interface cards | Compact footprint, lower pin count | Ensure antenna clearance from metal body |
GNSS / GPS positioning modules | Fewer data lanes than storage apps | Route GPS traces away from high-speed paths |
Embedded debug / programming headers | Test access during production and service | Consider whether locking mechanism is needed |
Industrial sensor interface boards | Balances I/O density with simplicity | Confirm operating temperature range |
One micro-inch of gold on the contact pads sounds thin — and it is. But gold doesn't oxidize. While bare copper or tin-plated contacts form oxide layers within months, driving contact resistance up and causing intermittent failures, gold-plated contacts maintain their initial resistance across years of service.
Performance Factor | What Gold Does | Why It Matters |
|---|---|---|
Corrosion resistance | Prevents oxide and sulfide formation | Stable low contact resistance over service life |
Insertion durability | Conforms to micro-roughness on mating surface | 60+ mating cycles without degradation |
Signal integrity | Clean surface means stable impedance | Lower jitter on high-speed paths |
Field serviceability | Survives repeated insertions during repair | Reduces RMA rate from connector failures |
If there's any chance the module gets removed for debugging, warranty repair, or field upgrade — 1u" gold is the minimum we'd recommend. The cost difference per connector is negligible; the cost of a field failure is not.
Before committing, run through this checklist — it'll save you a board spin.
Vertical clearance ≥3.5mm in enclosure; PCB flatness within IPC-6012 Class 2; SMT pad layout verified against CONSHARE drawing; pick-and-place nozzle clearance confirmed.
Signal bandwidth within your design budget; contact parasitic capacitance accounted for in SI simulation; contact resistance typically <30mΩ per contact; current capacity within your power delivery requirements.
Key type mismatch — A B-key module won't seat in a connector cut for a different key. Always cross-reference the key notch position before ordering samples.
Insertion force without PCB support — If technicians push modules in without backing support, you'll see pad lifting and cracked solder joints within the first production run.
Board warpage near the connector — Heavy copper pours or large components adjacent to the connector can warp the board during reflow, causing uneven contact pressure.
Every batch of CUF036G67M1XX goes through a multi-stage inspection before it reaches your dock:
Stage | Inspection Method | What We Verify |
|---|---|---|
Raw material intake | Copper alloy composition analysis | Conductivity and spring-force compliance |
Stamping / contact forming | CMM dimensional measurement | Pin geometry, pitch within ±0.15mm on critical features |
Gold plating | X-ray fluorescence (XRF) | Gold deposit ≥1 micro-inch on all contact surfaces |
Connector assembly | Automated optical inspection (AOI) | Contact coplanarity, alignment, body integrity |
Final quality audit | Insertion / extraction force testing | Mechanical durability within specified range |
Shipping sample audit | Contact resistance measurement | Electrical performance verified before lot release |
Our tolerances are verified on every batch with coordinate measuring equipment — connectors seat consistently across different lots. You won't need to re-tune your pick-and-place program when switching from lot A to lot B.
Dimension Class | Tolerance | What It Controls |
|---|---|---|
Critical (3-decimal) | ±0.15mm | Contact pitch, mating interface geometry |
Standard (2-decimal) | ±0.25mm | Body outline, SMT pad positions |
General (1-decimal) | ±0.50mm | Overall body dimensions |
Angular — precision | ±1° | Contact beam angles affecting normal force |
Order Type | Lead Time | What's Included |
|---|---|---|
Sample request | 3–5 business days | 10–20 pieces, express shipping, data sheet |
Pilot run (≤1,000 pcs) | 2 weeks | Full inspection report, compliance docs |
Production order | 3–4 weeks | Lot traceability, RoHS/REACH certificates |
Custom configuration | 4–6 weeks | Engineering review, depends on scope |
For established customers, CONSHARE holds agreed-upon inventory at our facility and releases it against your pull signals — cutting carrying costs while eliminating line-down risk when demand spikes.
Option | Available Range | Typical Use Case |
|---|---|---|
Gold plating thickness | 1u", 3u", 5u", 10u" | High-cycle or harsh environment deployment |
Contact alloy | Phosphor bronze, beryllium copper | Vibration-intensive or elevated-temperature designs |
Packaging format | Tape & reel, tray, bulk | Automated vs. manual assembly |
Lot marking | Custom date codes, customer lot IDs | Enhanced traceability for regulated industries |
Special inspection | 100% functional test, custom fixtures | Automotive, medical, aerospace qualification |
Housing marking | Custom colors, logo on body | Brand identification on production line |
NVMe SSDs typically use 67-pin B+M key connectors. This 20-pin version suits moderate I/O applications. Verify pinout mapping if your module only uses 20 contacts.
Minimum 60 cycles with 1u" gold and proper alignment. For test fixtures or service ports, we can specify 3u" or 5u" gold to extend cycle life.
Standard lead-free reflow, 260°C peak, per JEDEC J-STD-020. Surface-mount only — no wave soldering required.
Yes — 3D STEP files, 2D dimensional drawings, and PCB pad layout recommendations at no charge with sample requests.
Yes. Full compliance documentation ships with every production order.
Yes — with modified contact alloys, enhanced plating, and extended temperature testing. Contact our engineering team to discuss timeline and MOQ.
Engineering-driven manufacturing: Tolerance standards verified on every batch via CMM and statistical process control — not premium add-ons.
Responsive technical engagement: Our engineering team engages within 24 hours on technical inquiries during design-in.
Supply transparency: Lot traceability, material compliance certificates, and inspection reports come standard with every order.
Practical flexibility: Reasonable customizations don't carry exorbitant setup fees. If you need different gold thickness or packaging, let's talk.
Design-in partnership: We don't disappear after the sample order. If you hit a signal integrity issue during PCB layout, our team works through it with you.
When your product ships, the connector is the component customers physically interact with — every time they insert or remove a module. It's the mechanical handshake they'll judge your product by. That's not the place to cut corners.
Ready to evaluate? Contact CONSHARE today for samples, 3D models, and technical support.
