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Electron Microscope Filaments / Cathodes

aei standard loop filament
Tungsten Filaments 		aei standard loop filament
Kimball LaB6 Filaments 		aei standard loop filament
Denka LaB6 Filaments 		YPS Schottky type field emission (FE) source
YPS Schottky FE source


Tungsten Filaments / Cathodes for EM
Tungsten hairpin filaments are the standard type filaments widely used in Scanning Electron Microscopes, Transmission Electron Microscopes and Microprobe systems. Tungsten filaments are also called cathodes or electron emitters or electron sources. All filaments we offer are made to the original equipment manufacturer's specifications using special tools to guarantee the correct shape for the filaments. The filaments are annealed in vacuum, stress free and precisely aligned before they are shipped. For virtually all styles of filaments we also offer a re-tipping service. The used bases will be cleaned and reconditioned. After re-tipping, the filament will be pre-centered, vacuum annealed and inspected. Please consult the list below for the correct type of filament.

Instrument New Filament # Re-tip #
AEI 1403 1403-R
AMR / AMRAY (except AMRAY 1200 series) 1421 1421-R
AMRAY 1200 (Siemens style) ---- 1422-R
ARL ---- ----
Cambridge Instruments (except and S4-10) 1403 1403-R
Cambridge Instruments S4-10 (Siemens style) ---- 1422-R
Cameca ---- 1432-R
CamScan standard Siemens style ---- 1422-R
CamScan with AEI conversion 1403 1403-R
CamScan with new Tescan column 1427 1427-R
ETEC ---- ----
FEI / Philips 1412 1412-R
Hitachi 1428 1428-R
ISI / ABT / Topcon 2-pin 1425 1425-R
ISI / ABT / Topcon 3-pin 1426 1426-R
JEOL "GC type" older style JSM35, JXA50 1430 1430-R
JEOL "K" type modern style 1407 1407-R
Leica 1403 1403-R
LEO 1403 1403-R
LEO 1450 (except systems converted to AEI) 1427 1427-R
Novascan (SEMCO) 1403 1403-R
Philips V-loop (PSEM 500 and later, EM200 and later) 1412 1412-R
Tescan 1427 1427-R
Siemens ---- 1422-R
ZEISS 1427 1427-R
ZEISS EVO® 1403 1403-R


aei standard loop filament

AEI Filaments for Zeiss (EVO®), LEO, AEI, Cambridge (except S4-10), Novascan, Leica

Prod #DescriptionUnitPriceOrder / Quote
1403
Agar A054 "AEI" Filaments, white base
box/10
$125.80
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1403-R
Re-tip 1403 Filament
each
1-9
$19.80
Qty:
10+
17.80
electron microscope filament

FEI and Philips Filaments

Prod #DescriptionUnitPriceOrder / Quote
1412
Agar A086 FEI/Phillips V-loop Filaments
box/10
$349.30
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1412-R
Re-tip A086
each
1-9
$26.80
Qty:
10+
24.12
electron microscope filament

JEOL K-type Filaments

Ceramic in stainless steel alignment ring.

Prod #DescriptionUnitPriceOrder / Quote
1407
Agar A092 JEOL K-type filament
box/6
$399.50
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1407-R
Re-tip A092
each
1-5
$23.20
Qty:
6+
20.90
jeol gc filament

Jeol GC Filaments

Older style like JSM35, JXA50

Prod #DescriptionUnitPriceOrder / Quote
1430
Jeol GC Filaments
box/10
$486.80
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1430-R
Re-tip 1430 Filament
each
1-9
$23.25
Qty:
10+
20.93

Hitachi S-type Filaments

(newer H-, S- and X- series)

Prod #DescriptionUnitPriceOrder / Quote
1428
Hitachi H-, S-, and X- series Filaments
box/10
$532.30
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1428-R
Re-tip 1428 Filament
each
1-9
$25.20
Qty:
10+
23.39
zeiss filament

Zeiss (DSM Series and TEM), LEO (TEM 900 Series), LEO (SEM 1400 Series), Tescan Filaments

Prod #DescriptionUnitPriceOrder / Quote
1427
Zeiss Filaments
box/10
$862.00
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1427-R
Re-tip 1427 Filament
each
1-9
$23.20
Qty:
10+
20.90
loop filament

AMRAY Filaments, except AMRAY 1200 Series

Prod #DescriptionUnitPriceOrder / Quote
1421
AMRAY Filaments
box/10
$465.80
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1421-R
Re-tip 1421 Filament
each
1-9
$22.50
Qty:
10+
20.25
electron microscope filament

ISI / ABT / Topcon Filaments, 2-prong curved pins.

Prod #DescriptionUnitPriceOrder / Quote
1425
ISI Filaments, 2-prong
box/10
$511.70
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1425-R
Re-tip 1425 Filament
each
1-9
$20.90
Qty:
10+
18.80
microscope filament

ISI / ABT / Topcon Filaments, 3-prong

Prod #DescriptionUnitPriceOrder / Quote
1426
ISI Filaments, 3-prong
box/12
$511.70
Qty:

Prod #DescriptionUnitQtyPriceOrder / Quote
1426-R
Re-tip 1426 Filament
each
1-11
$20.90
Qty:
12+
18.80

Re-tip for Siemens Style Filaments (for AMRAY 1200, CamScan, Cambridge S4-10, Siemens)

Prod #DescriptionUnitQtyPriceOrder / Quote
1422-R
Re-tip Siemens Filament
each
1-9
$22.50
Qty:
10+
20.25

Re-tip for Cameca Filaments

Prod #DescriptionUnitQtyPriceOrder / Quote
1432-R
Re-tip Cameca Filament
each
1-9
$24.90
Qty:
10+
22.40
Re-tip Service
NOTES:
  • New filaments are attached to used bases, supplied by the customer. Used base will be cleaned and reconditioned. After re-tipping, the filament will be pre-centered, vacuum normalized and inspected.
  • We also offer re-tip service for older style SEM, TEM or Microprobe; ask our customer service for a quote.


Electron Source Performance Comparison:
Emitter Type Thermionic Thermionic Schottky FE cold FE
Cathode material W
 LaB6
 ZrO/W (100)
 W(310)
Operating temperature [K] 2,800
 1,900
 1,800
 300
Cathode radius [nm] 60,000
 10,000
 < 1,000
 < 100
Effective source radius [nm] 15,000
 5,000
 15 (*)
 2.5(*)
Emission current density [A/cm2] 3 30 5,300 17,000
Total emission current [µA] 200 80 200 5
Normalized brightness [A/cm2.sr.kV] 1.104 1.105 1.107 2.107
Maximum probe current [nA] 1000 1000 10 0.2
Energy spread @ cathode [eV] 0.59 0.40 0.31 0.26
Energy spread @ gun exit [eV] 1.5 - 2.5 1.3 - 2.5 0.35 - 0.7 0.3 - 0.7
Beam noise [%] 1 1 1 5 - 10
Emission current drift [%/h] 0.1 0.2 < 0.5 5
Operating vacuum hPa/mbar < 1.10-5 < 1.10-6 < 1.10-8 < 1.10-10
Typical Cathode life [h] 100 > 1000 > 5000 > 2000
Cathode regeneration not required not required not required every 6 to 8 hours
Sensitivity to external influence minimal minimal low high
* virtual source

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Page Last Updated: May 1, 2009