The CD16B is a large size nixie tube made by NEC of Japan. This tube uses an unusually high cathode current for its size.
| Digit size | 28mm |
| Min current | 5mA |
| Max current | 9mA |
| Min current (d.p.) | 0.3mA |
| Max current (d.p.) | 2mA |
| Base | B12A |
Although it uses the same socket as many other tubes, such as the CD12, it is not pin-compatible with those tubes.