Mullard Cold Cathode Indicator Tubes
Abbreviations: dp = decimal point, LH = left
hand, RH = right hand.
Char. = character, Rec. = recommended, Maint = maintenance. HT
= High Tension (ie., B+).
Mullard Type No. |
Bulb colour |
Display |
Char. Height /mm |
Min. HT /V |
Maint. Voltage |
Rec. Cathode Current /mA |
Base & view |
ZM1020 |
red |
0123456789 |
15.5 |
170 |
140 |
2.0 |
B13B end view |
ZM1022 |
clear |
ZM1021 |
red |
A V Ω + - % ~ |
ZM1023 |
clear |
ZM1024 |
red |
c/s kc/s Mc/s ns μs ms s |
ZM1026 |
red |
½ |
|
|
|
|
|
ZM1040 |
red |
0123456789 |
30 |
170 |
140 |
4.0 |
B13B side view |
ZM1041 |
red |
- + |
20 |
ZM1080 |
red |
0123456789 |
13 |
170 |
140 |
2.0 |
Wire ended. Side view. |
ZM1082 |
clear |
ZM1081 |
red |
- + ~ |
10.5 |
ZM1083 |
clear |
ZM1162 (rectangular bulb) |
clear |
0123456789 |
15.5 |
170 |
140 |
2.0 |
14 pin special. end view. |
ZM1170 |
Red |
0123456789 |
15.5 |
170 |
140 |
2.0 |
Wire ended. Side view. |
ZM1172 |
Clear |
ZM1174 |
Red |
0123456789 LH dp |
ZM1175 |
Clear |
ZM1176 |
Red |
0123456789 RH dp |
ZM1177 |
Clear |
ZM1230 |
Red |
0123456789 |
15.5 |
170 |
140 |
2.0 |
Wire ended. Inverted side view. |
ZM1232 |
Clear |
ZM1080 Data (Mullard data sheet December 1968)
Limiting Values (Absolute)
Cathode current (each digit). |
Max average: (Max averaging time = 20 ms) |
3.5 mA |
Max. Peak |
12 mA |
Min. average during conduction: |
1.5 mA |
Bulb Temp: |
Max: |
+70 °C |
Min (see note 2) |
-50 °C |
|
Symbol |
Pulse Operation
Max cathode current |
Peak: |
12 mA |
Average (Averaging time = 20 ms): |
2.5 mA |
Min cathode current for satisfactory display, average |
0.8 mA |
Pulse duration |
Max |
20 ms |
Min |
100 μs |
Anode to cathode maintaining voltage: |
see graph |
Extinction Requirements
Max anode to cathode voltage to ensure extinction: |
115 V |
Life Expectancy (assuming recommended operating conditions and room temperature).
Continuous display of one digit (see note 1): |
>5000 hours |
Sequentially changing the display from one digit to the next every 100 hours or less: |
>30 000 hours |
|
|
Mounting Position:
The numbers are viewed through the side of the envelope. The
numbers will appear upright (within ±3°) when the
tube is mounted vertically.
Operating Notes:
1) The life expectancy figures given above
relate to operation with DC cathode currents between 1.5 and
2.5 mA and at all permitted pulsed cathode currents. When a DC
cathode current range of 1.5 to 3.5 mA is used, the life expectancy
exceeds 3000 hours with continuous display of one digit.
2) For bulb temperatures below 0°C, the
life expectancy of the tube is substantially reduced.
3) The leads are tinned and may be dip-soldered to a minimum
of 5mm from the seals at a solder temperature of 240°C for
a maximum of 10 seconds.
4) Care should be taken not to bend the leads nearer than 1.5mm
from the seals.
5) The tube may be soldered directly into the circuit but heat
conducted to the glass-to-metal seals should be kept to a minimum
by the use of a thermal shunt.
Information on
the use of pin 4 (primer pin)
ZM1080 Dimensions and pinout.
Last updated 29th Sept 2021