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Displays for Calculators: LD8118

 
NEC LD8118 Nine digit VFD
ID: LD8118 Used in: Adler EC8s
Type: Vacuum Fluorescent Display (VFD), nine digit Santron 722
Maker: NEC
Typical date range: 1978
Package: Flat faced glass body, connectors on the lower edge in two groups
Date coding system: {year}{month} i.e. 8B is February 1978
Notes:

The LD8118 fluorescent display tube is a triode that consists of filament, control grid and anode plate.  The filament is a very thin tungsten or nickel alloy wire.  The grid consists of a wire mesh for a clear display and is located in front of the anode plate.  The anode plate is made of insulating material, such as glass, and it has grooves that are cut as a mosaic in accordance with a character pattern.  These grooves are coated with conductive and fluorescent material.

 

 

Pin connections

1 2 3 4 5 6 7 8 9 10
F COM SA SB SG SF SC SE SD DP
11 12 13 14 15 16 17 18 19 20
G9 G8 G7 G6 G5 G4 G3 G2 G1 F
 

Electrical Specifications

Item Symbol Ratings Unit
Filament Ef 3.0V Vac
Anode voltage eb 24V Vp-p
Grid Voltage ec 24V Vp-p
Filament current If 23 mA
Anode current ib/dig 1.0 mAp-p
Grid current ic/dig 2.0 mAp-p
Brightness B 100 (min) ft.L