This document introduces the .025" Round Conductor Flat Cable 30 AWG Solid, TPE 3749 Series product from 3M Interconnect Solutions Division. The product features high signal density, excellent transmission properties, and reliable quality.
The 3749 Series round conductor flat cable from 3M provides a .025‑inch spacing with 30 AWG solid tinned copper conductors and thermoplastic elastomer (TPE) insulation. The design supports mass termination and can be zippable for branching or discrete termination, meeting SCSI‑3 Fast‑20 characteristic impedance requirements.
Technical specifications include a 150 V rating (USA/Canada), <50 V EU rating, temperature range from –40 °C to +105 °C, and a 90 Ω unbalanced characteristic impedance. The cable is available in standard lengths of 100 ft or 300 ft per roll, with various conductor counts and dimensions listed in the data tables.
| Conductor size | 30 AWG (0.254 mm) solid tinned copper |
|---|---|
| Insulation material | Thermoplastic Elastomer (TPE) |
| Voltage rating | USA/Canada 150 V, EU <50 V |
| Temperature rating | –40 °C to +105 °C |
| Flammability rating | USA VW‑1, Canada FT1 |
| Characteristic impedance (unbalanced) | 90 Ω |
| Capacitance (unbalanced) | 16.5 pF/ft |
| Inductance (unbalanced) | 0.13 µH/ft |
| Propagation delay (unbalanced) | 1.48 ns/ft |
| Velocity of propagation (unbalanced) | 69 % |
| Insulation resistance | > 1 × 10¹⁹ Ω·10 ft |
| Color | Gray |
It is rated for 150 V in the USA and Canada and less than 50 V in the EU.
The cable can be used from –40 °C up to +105 °C.
The unbalanced characteristic impedance is 90 Ω.