Product Hierarchy
Product Hierarchy

9L28020 - Flat Gray Ribbon Cable 9L280 Series, #28-20c, .050" Pitch

Belden .050" pitch gray ribbon cable was designed for general purpose electronic interconnect applications. The cable provides reliable mass-termination to standard IDC connectors.

Physical Characteristics (Overall)

AWGMaterialConstruction n x DNo. of Conductors
28TC - Tinned CopperStranded20
Conductor Count: 20
MaterialNominal Wall Thickness
PVC - Polyvinyl Chloride0.01 in
Color Chart
Outer Shield Material
No Shield
Outer Jacket Material
Nominal Wall Thickness
.035 in

Construction and Dimensions

Cond Spacing Center-Center: .050 +/- .002
Cond Spacing Center-Center Outside: .95 +/- .008
2.75 twist/ft
OuterJacket1, Nominal Width: 1.00 +/- .008 mm

Electrical Characteristics

Conductor DCR
Nominal Conductor DCRNominal Conductor DCR Conductor Resistance
Max. 68.2 Ohm/1000ft68.2 Ohm/1000ft
ElementNom. Capacitance Conductor to Conductor
@ 1 kHz (GSG)18 pF/ft
@ 1 MHz (GS)10 pF/ft
@ 1 MHz (GSG)15 pF/ft
ElementNominal Inductance
@ 1 MHz (GS)0.29 µH/ft
@ 1 MHz (GSG)0.2 µH/ft
Nominal Balanced Characteristic Impedance DescriptionNominal Characteristic ImpedanceNominal Characteristic Impedance Description
(GS)150 Ohm(GS)
(GSG)105 Ohm(GSG)
High Frequency (Nominal/Typical)
Frequency [MHz]Nom. Insertion Loss
10 MHz2.8 dB/100ft
20 MHz4.8 dB/100ft
30 MHz6.5 dB/100ft
40 MHz8.3 dB/100ft
50 MHz9.8 dB/100ft
60 MHz12 dB/100ft
70 MHz13 dB/100ft
80 MHz14 dB/100ft
90 MHz15.8 dB/100ft
100 MHz17 dB/100ft
Nominal DelayNominal Velocity of Propagation (VP) [%]
1.40 ns/ft72 %
Unbalanced Crosstalk
ElementTypical Unbalanced NEXT %Typical Unbalanced FEXT %Typical Cross Talk Pulse Rise Time (ns)
10 ft. sample length4.8 MHz7 MHz3 ns
10 ft. sample length3.5 MHz4.7 MHz5 ns
10 ft. sample length3 MHz3 MHz7 ns
High Freq
Frequency [MHz]
10 MHz
20 MHz
30 MHz
40 MHz
50 MHz
60 MHz
70 MHz
80 MHz
90 MHz
100 MHz
Max. Recommended Current [A]
Per conductor @ 20°C: 1 Amp
Dielectric Withstand VoltageUL Voltage Rating
2,000 V RMS300 V RMS

Temperature Range

Operating Temp Range: -40°C To +105°C

Mechanical Characteristics

Bulk Cable Weight: 23 lbs/1000ft


UL Rating: 105°C, 300 V RMS, VW-1
UL AWM Style: 2651
CSA Rating: 105°C, 300 V RMS, FT1
CSA AWM Specification: AWM I A 105°C 300 V FT1

Applicable Environmental and Other Programs

EU Directive 2000/53/EC (ELV): Yes
EU Directive 2011/65/EU (ROHS II): Yes
EU Directive 2012/19/EU (WEEE): Yes
EU Directive 2015/863/EU: Yes
EU Directive Compliance: Yes
EU CE Mark: Yes
EU RoHS Compliance Date (yyyy-mm-dd): 2005-07-01
MII Order #39 (China RoHS): Yes

Flammability, LS0H, Toxicity Testing

UL Flammability: VW-1
CSA Flammability: FT1
UL voltage rating: 300 V RMS


Plenum (Y/N): No

Part Number

Item #ColorLengthUPC
9L28020 008H100Gray100 ft612825221654

Product Notes

Notes: GSG=Ground-Signal-Ground Mode


Update and Revision: Revision Number: 0.237 Revision Date: 04-28-2020
Date: 2005-07-01
No accessories are available for this product