SP-252 (Babcock)
Panaplex Display

Planar neon gas discharge 'Panaplex' readout. Separate anodes allow single-digit multiplexing.
Two digit, 14-segment display with 2 deciamal points on the right side capable of presenting approximately a 60 character set. This character set includes all the letters of the alphabet, the numbers 0-9, and some special symbols.

Röhrendaten/Tube Data
German English    
Typ Type   SP-252
Hersteller Brand   Babcock
Vergleichstypen Substitutes   -
Symbole Displayed symbols   Two digit, 14-segment display with 2 deciamal points on the right side capable of presenting approximately a 60 character set. This character set includes all the letters of the alphabet, the numbers 0-9, and some special symbols.
Symbolhöhe Symbol height   14mm (0.55")
Abmessungen Dimensions   27mm (1.06") X 28.4mm (1.12") X 13.1mm (0.515") thick
Pindurchmesser Pin diameter   0.48mm (0.019")
min. Betriebsspannung min. supply voltage V 180
typ. Brennspannung typ. maintaining voltage V 135
Betriebs-Kathodenstrom typ. cathode current mA 0.33
Sockel Base   34 pins, special arrangement
Fassung Socket   Spezielle 34 Pin Fassung/Special 34 pin socket

Features:
0.55 Inch (14mm) Character Height (SP-250 Series)
Neon-Orange Color
210 fL Brightness at Nominal Current
130° Viewing Angle
40 ft. (12,2m) Viewing Distance (SP-250 Series)
10 Year Life

DC Characteristics:

 

MIN

TYP

Display Supply Voltage1, 2

 

180 Vdc

Anode-to-Cathode Voltage
Drop (Typical Current, segment-b = 330µA)

 

135 Vdc

Cathode Current - Typical
Segment (Seg. "b") 3

130µA

330 µA

Cathode Current – Keep-Alive 4, 6

 

50 µA

Power Dissipation (with all segments lighted &
assuming 330µA typical Segment current) 3

 

575 mW

Operating Temperature

 

0 to 70°C

Storage Temperature

 

-55 to 125°C

Multiplex Characteristics:

 

TYP

Display Supply Voltage 2

180 Vdc

Anode Voltage Swing

45 Vdc

Anode On Time 4

200 µsec

Interdigit Blanking Time
(b-segment current = 850 µA @ 180 V) 5

55 µsec

Refresh Period

<10msec

Cathode Voltage Swing

50 Vdc

Cathode Bias Voltage
(ON Anode to OFF Cathode Voltage) 8

110 Vdc

Notes:

  1. The minimum recommended voltage required to ionize the display is 160 volts dc. After the display has ionized, the voltage drop is approximately 135 volts. Typical cathode current of 330 µA is assumed.
  2. Display supply voltage should not exceed 200 Vdc when the display is operated with a segment driver of 80 volt breakdown. Higher display voltages are acceptable when resistors or discrete transistors are used for current limiting.
  3. The lowest current for even glow on the b-segment is 130 µA. Currents up to 1.5 times the typical current may be used; however, life expectancy may be reduced by operation at excessively higher currents. For multiplexed operation (time shared), segment currents may be increased to 1.25 mA with 0.25 or smaller duty cycles.
  4. Anode On Time assumes typical keep-alive current and typical anode supply
  5. Blanking requirements are strongly dependent upon the mode of multiplex operation and upon the segment current used.
  6. Keep alive is recommended in all multiplexed applications. Refresh period is limited to 3 msec if keep alive is not used.
  7. Under specific conditions, Cathode Voltage Swings of as low as 30 volts are acceptable.
  8. The combination of Cathode Bias Voltage and Cathode Voltage Swing must be within recommended display supply voltage.

Examples of the Character Set Available with the SP-252:

Segment Designation:
 

Pin

Segment

Current Ratio
to b Segment

Pin

Segment

Current Ratio
to b Segment

1

a

1.00

10

k

0.88

2

b

1.00

11

m

0.47

3

c

1.26

12

n

0.94

4

d

1.06

13

p

1.09

5

e

1.15

14

r

1.09

6

f

0.97

15

Dec. Point

0.41

7

g

0.47

16

Keep Alive

-

8

h

0.79

17

Anode

-

9

j

0.82

 

 

 

All segments are ratioed to segment 1) and are listed in Table 1.

Outline & Pinout:


Ansicht von vorne/View from front


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