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Description
3M 3749-40 Ribbon Cable, Round Conductor Flat, Grey, 40 Core, 30 AWG, 0.051 mm�The 3749 series from 3M are round conductor flat cable. The ribbon cable has 30AWG solid conductors on 0. 025inch spacing that allows for mass termination. The Thermoplastic elastomer (TPE) insulation provides excellent transmission properties. Zippable for branching or discrete termination Meets SCSI 3 Fast 20 characteristic impedance requirements Gray colour insulation Tinned solid copper conductor Voltage rating of 150V Operating temperature range
The 3749 series from 3M are round conductor flat cable. The ribbon cable has 30AWG solid conductors on 0.025inch spacing that allows for mass termination. The Thermoplastic elastomer (TPE) insulation provides excellent transmission properties.
- Zippable for branching or discrete termination
- Meets SCSI-3 Fast-20 characteristic impedance requirements
- Gray colour insulation
- Tinned solid copper conductor
- Voltage rating of 150V
- Operating temperature range -40�C to +105�C
- 10 to 100 conductors based on ordering
- First conductor is identified by a blue marking on one edge of cable
- UL recognised (Style 20297) in FT2 flame retardant
- Close spacing permits higher signal density
Applications
Industrial, Power Management
Product details
| No. of Cores | 40Core |
| Reel Length (Metric) | - |
| Conductor Material | Tinned Copper |
| Pitch Spacing | 0.635mm |
| Jacket Material | TPE |
| Voltage Rating | 50V |
| Cable Width | 25.4mm |
| Reel Length (Imperial) | - |
| Product Range | 3749 Series |
| Wire Gauge | 30AWG |
| Jacket Colour | Grey |
| No. of Max Strands x Strand Size | Solid |
| Conductor Area CSA | 0.051mm� |
| Ribbon Cable Type | Flat Ribbon Cable |
Other details
| Brand | 3M |
| Part Number | 3749-40 |
| Quantity | 1 Metre |
| Technical Data Sheet EN |
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. Image is for illustrative purposes only. Please refer to product description.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.3 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
So good - I’m buying MORE.
Number of Items: 3, Color: White (3-pairs), Size: Medium
I’m gonna give you more detail than you need about why I’m buying these socks again.
I’ve been the mom of girl athletes. I’ve been a model and a fashion director. I’ve worn every brand of shoe on the planet and never found a shoe that did NOT find a vulnerable spot on my foot to rub raw. Even my beloved white Jack Purcell sneakers.
With that said - I don’t like socks. I’ve bought a TON of them in 35+ years.....all major brands.
They shift. They lose their shape. They get holes in them and wear out too fast. Not these.
I retired this year, and knowing I’d be in sneakers a lot, traveling, sightseeing ......
I bought these 6 months ago and have worn them constantly. I’ve traveled with them. I’ve washed them in hot water and bleach.
The socks are like brand new. They are exactly the right cut so as not to be seen in a basic sneaker. The little silicone patch on the heel stays put. Not once have I had to dig down into my shoe and pull the sock back up. The socks have stayed soft and EXACTLY the same as the day they were new.
Like I said - I am back to buy them again. Great quality!
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Reviewed in the United States on January 20, 2021
★★★★★ 5
No slip low socks
Number of Items: 3, Color: Black/White (3-pairs), Size: Medium
Perfect! ❤️ these!
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Reviewed in the United States on February 16, 2026
★★★★★ 4
Stay put!
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
Nice and thin, soft, and stay put. I wear an 8 shoe and don’t like a thick sock taking up room. These socks are a bit tight on big toe. Wish they came in large.
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Reviewed in the United States on October 10, 2023
★★★★★ 5
The best
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
The best no show socks I have found. Stay in place very well and hold up wash after wash. I have tossed all the other brands I’ve bought over the years and stocked up on these as I was tired of digging through the drawer hoping to find a clean pair.
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Reviewed in the United States on December 8, 2024
★★★★★ 5
Love these.
Number of Items: 3, Color: White (3-pairs), Size: Medium
I have them in black and white. I use them everyday in all shoes. These are very versatile and a great quality material. They take a looong time to wear and they stay in place. Very washable and good material. They are not too thick and they do not shrink. I do air dry mine. They do not hold smells even in the summer heat.
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Reviewed in the United States on July 7, 2024