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Thyratrons

L3 EDD produces a broad line of metal-ceramic hydrogen thyratrons. These devices block voltages up to 100 kV and switch currents up to 20,000 amps. Thyratrons are robust switching devices suitable for a wide variety of pulse power applications, including radars, particle accelerators, broadcast transmitters, medical and industrial lasers.

L3 offers standard models from < 2” to 6” diameter with a variety of options available. Please contact the factory for special requirements for Excelitas cross references. Our thyratron engineering team has extensive experience supporting a wide range of applications.

  • Medical

  • Laser & Fast Switching

  • Radar & General Purpose

  • Accelerator

  • Crowbar (Klystrons & IOT Protection)
Medical Thyratrons

Product
#
High Voltage
Gaps
Peak Anode
Voltage
(kV)
Peak Anode Current
(A)
Avg
Anode Current
(ADC)
Cathode Heater (V/A) Reservoir Heater
(V/A)
Cross Reference Notes
L4884B 1 16 325 0.2 6.3/11.5 - 8503, 5C22, 8613, CV-2520, CV6022 5, 9, 14
L4680 1 25 1,000 1.25 6.3/14.5 6.3/7.5 CX-1180 2
L4904 1 35 1,750 3 6.3/27.0 5.0/9.0 CX-1154 2, 4
L4904A 1 35 1,750 2 6.3/27.0 6.2/5.3 TX-1154 2, 4

Laser and Fast Switching Thyratrons

Product
#
High Voltage
Gaps
Peak Anode
Voltage
(kV)
Peak Anode Current
(A)
Avg
Anode Current
(ADC)
Cathode Heater (V/A) Reservoir Heater
(V/A)
Cross Reference
L4897A 1 20 3000 6.3/8.3 6.3/1.75    
L4115 1 35 2,000 6.3/22 6.3/3    
L4189A 1 35 20,000 6.3/22 6.3/3 F-189, LP-189, LP289 11
L4915B 1 35 10,000 6.3/22 6.3/6 HY-3003, F-211, LT-340, F-340 11
L4961 1 35 12,500 6.3/22 6.3/3 246 11
L4945A 2 50 10,000 6.3/24 6.3/3.0 F229, LS-3229, CX2608 1, 2, 11
L4906A 1 35 20,000 6.3/14.5 6.3/3.0 F-205 7, 11

Radar and General Purpose Thyratrons
Product
#
EIA
#
App
Spec
Peak Anode Current
(kV)
Peak
Anode Current
(A)
Avg
Anode
Current
(ADC)
Cathode Heater
(V/A)
Reservoir Heater
(V/A)
Cross Reference Notes
L4669 7782 MIL-PRF-1/1636 12 350 0.2 6.3/7.0 6.3/2.5 HY-6, KU-71 -
L4668 7665A MIL-PRF-1/1485 16 350 0.5 6.3/8.0 6.3/4.0 HY-60, FX2522 -
L4676 7665 MIL-PRF-1/1485 16 350 0.5 6.3/8.0 6.3/4.0 KU-72 -
L4884 8613 MIL-PRF-1/1590 16 500 0.5 6.3/11.5 - HY-1A, FX2522 5, 9
L4884A - 5389078 16 500 0.5 6.3/11.5 - HY-1050 5, 9
L4958 7620 MIL-PRF-1/1612 20 500 0.5 6.3/7.5 6.3/4.0 HY-10N, HY-14 -
L4898 - - 20 500 0.5 6.3/7.5 6.3/4.0 HY-10R, 0261, F261 -
L4897 - - 20 500 0.5 6.3/7.5 6.3/4.0 HY-11T,0265/F-265, FX2541 -
L4871 5949A MIL-PRF-1/1100 25 500 1 6.3/22 4.5/6.0 F-150,FX-2519 5, 10
L4960 - - 25 1,000 2 6.3/22 6.3/6.0 HY-3055 -
L4885 7322 MIL-PRF-1/1371 25 1,000 2 6.3/22 6.3/6.0 1802 6
L4901 - - 30 2,000 2 6.3/25 4.5/10 CX1670A,0279 4
L4886 7390 MIL-PRF-1/1361 33 2,000 4 6.3/35 4.5/10 - -
L4886A - - 33 2,000 4 6.3/35 4.5/10 0281 -
L4886B 8789 MIL-PRF-1/1658 33 2,000 4 6.3/35 4.5/10 - -
L4886C 7667 - 35 2,000 4 6.3/35 4.5/10 7667, KU-274 -
L4990 7890 9747588 40 2,400 4 6.3/25 4.5/10 7890 1, 3
L4883 8614 713090-18 40 4,000 10.9 6.3/30 4.5/11 HY-5 -
L4883A - 7534252 40 4,000 4 6.3/30 4.5/11 HY-5G -

Accelerator Thyratrons
Product
#
High Voltage
Gaps
Peak Anode
Current
(kV)
Peak Anode Current
(A)
Avg
Anode Current
(ADC)
Cathode Heater (V/A) Reservoir Heater
(V/A)
Cross Reference Notes
L4913 2 70 3,000 2 6.3/25 5.0/7.05 CX1168 1, 2, 4
L4963 3 105 3,000 2 6.3/25 5.0/7.0 CX1171D 1, 2, 4, 13
L4938 1 35 15,000 12 6.3/70 4.5/20 146 1, 2, 4
L4888 2 55 15,000 8 6.3/75 4.5/25 0241, 8479, F-175, CX-1836, CX-1536 2, 4
L4174 1 33 2,000 4 6.3/27 5.5/10 CX-1174 2, 4

Crowbar Thyratron (klystron and IOT protection)
Product
#
High Voltage
Gaps
Anode
Voltage
(kV)
Peak Anode Current
(A)
Coulomb Transfer per pulse Coul. Cathode Heater (V/A) Reservoir Heater
(V/A)
Cross Reference Notes
L4945A 2 40 1,500 7 6.3/22 6.3/3 CX-2708 1, 2, 4
  1. Gradient grids, one or more
  2. Auxiliary (pre-ionizing) grid
  3. Integral anode cooling chamber
  4. Shielded gap for x-ray attenuation
  5. Plug-in socket required
  6. MT-4 mounting socket
  7. Grounded grid (triggered spark gap thyratron)
  8. High-pulse repetition rate design
  9. Reservoir heater and cathode heater internally connected in parallel
  10. Metal-ceramic version of glass design
  11. Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service
  12. Long-grid ceramic to suppress external arc-over
  13. Oil for De-Qing operation

Notes: Unless otherwise indicated, these devices are flange-mounted single voltage gap triodes. Peak Current (ib) ratings can be appreciably higher for sub-microsecond pulse widths. The minimum open circuit control grid voltage and the minimum peak short circuit control grid current is specified. Cathode and reservoir heater voltages are nominal operating voltages. Cathode and reservoir heater currents are the maximum levels for the nominal voltage.

For more information, please contact us.