Maida Development Company 

 
 
 
 
 

GDT SERIES 

 

Gas Discharge Tube 

 

The Gas Discharge Tube, or GDT, Series are designed to withstand the rigors of 
overvoltages and transient currents with excellent surge current to size ratio. GDT’s 
exhibit very low capacitance values which are beneficial in numerous applications: 
including data and communication protection. The GDT Series are also used in AC 
power line applications as they exhibit no leakage current and have small to large surge 
capabilities. Standard and custom sizes are available with no wire lead, wire leads, and 
surface mount options. Standard and custom voltages are also available. 

 
 
 
 
 
 

 

MAIDA DEVELOPMENT COMPANY 

Phone: (757) 723-0785, Fax: (757) 722-5471 

www.maida.com

, sales@maida.com 

INTRODUCTION 

 

 

The Gas Discharge Tube (GDT) is an over-
voltage protection device typically used 
against overvoltages caused by transients 
such as lightning. The purpose of a GDT, 
similar to a varistor, is to redirect the transient 
condition away from the protected circuit. Gas 
Discharge Tubes exhibit very low capacitance 
values which are beneficial in data and 
communication protection. GDT’s are also 
used in AC power line applications as they 
exhibit no leakage currents. 
 
Maida’s GDT’s are offered in various 
configurations with numerous operating 
voltages and maximum surge current ratings. 
The GDT’s are manufactured in no leads, 2 and 
3 leaded configurations as well as surface 
mount. 

STYLE DESIGNATION 

 
The following is the standard part numbering 
system when ordering our Gas Discharge Tube 
(GDT) components: 

EX: 55A090 

 

1.) Nominal Diameter (mm) 
 
2.) Nominal Height (mm) 
 
3.) Lead Configuration 

A – no leads 
B – leads 
 

4.) Nominal DC Breakdown Voltage 

e.g. 090 is 90V 
       151 is 150V 
       3000 is 3000V 

STANDARD MARKING 

 
Minimum marking information shall consist of 
the style designation, manufacturer’s initials, 
and a date code. 
 
56B090 
MDC1110 
 
50B075 
MDC1110

56B090

MDC1110

50B075

MDC1110

GAS DISCHARGE TUBE (GDT) SERIES 

 

 

 

 

 

 

 

Maida    Style 

Number      

Nominal DC 

Breakdown 

Voltage

Impulse 

Breakdown 

Voltage

Insulation 

Resistance 

Capacitance 

@ 1MHz

(2 Electrode)

(V)

(V)

1X (kA)

10X (kA)

(M

Ω

)

(pF)

55A075

75

600

10

5

1000

1

5A, 5 times

55A090

90

600

10

5

1000

1

5A, 5 times

55A150

150

650

10

5

1000

1

5A, 5 times

55A230

230

650

10

5

1000

1

5A, 5 times

55A350

350

800

10

5

1000

1

5A, 5 times

56A075

75

600

10

5

1000

1.5

5A, 5 times

56A090

90

600

10

5

1000

1.5

5A, 5 times

56A150

150

650

10

5

1000

1.5

5A, 5 times

56A230

230

650

10

5

1000

1.5

5A, 5 times

56A350

350

850

10

5

1000

1.5

5A, 5 times

56A470

470

1000

10

5

1000

1.5

5A, 5 times

56B075

75

600

10

5

1000

1.5

5A, 5 times

56B090

90

600

10

5

1000

1.5

5A, 5 times

56B150

150

650

10

5

1000

1.5

5A, 5 times

56B230

230

650

10

5

1000

1.5

5A, 5 times

56B350

350

850

10

5

1000

1.5

5A, 5 times

56B470

470

1000

10

5

1000

1.5

5A, 5 times

86A075

75

600

20

10

1000

1.5

10A. 5 times

86A090

90

600

20

10

1000

1.5

10A. 5 times

86A150

150

650

20

10

1000

1.5

10A. 5 times

86A230

230

650

20

10

1000

1.5

10A. 5 times

86A350

350

800

20

10

1000

1.5

10A. 5 times

86A470

470

1000

20

10

1000

1.5

10A. 5 times

86A600

600

1100

20

10

1000

1.5

10A. 5 times

86A800

800

1400

20

10

1000

1.5

10A. 5 times

86A1000

1000

1600

20

10

1000

1.5

10A. 5 times

86B075

75

600

20

10

1000

1.5

10A. 5 times

86B090

90

600

20

10

1000

1.5

10A. 5 times

86B150

150

650

20

10

1000

1.5

10A. 5 times

86B230

230

650

20

10

1000

1.5

10A. 5 times

86B350

350

800

20

10

1000

1.5

10A. 5 times

86B470

470

1000

20

10

1000

1.5

10A. 5 times

86B600

600

1100

20

10

1000

1.5

10A. 5 times

86B800

800

1400

20

10

1000

1.5

10A. 5 times

86B1000

1000

1600

20

10

1000

1.5

10A. 5 times

86A0752

75

600

25

20

1000

1.5

20A, 5 times

86A0902

90

600

25

20

1000

1.5

20A, 5 times

86A1502

150

650

25

20

1000

1.5

20A, 5 times

86A6002

600

900

25

20

1000

1.5

20A, 5 times

86B0752

75

600

25

20

1000

1.5

20A, 5 times

86B0902

90

600

25

20

1000

1.5

20A, 5 times

86B1502

150

650

25

20

1000

1.5

20A, 5 times

86B6002

600

900

25

20

1000

1.5

20A, 5 times

88B800

800

1200

20

10

1000

1.5

10A. 5 times

88B1000

1000

1400

20

10

1000

1.5

10A. 5 times

88B1500

1500

2500

10

5

1000

1.5

5A, 5 times

88B2500

2500

3500

5

2.5

1000

1.5

2.5A, 5 times

88B3000

3000

4000

5

2.5

1000

1.5

2.5A, 5 times

Impulse Discharge 

Current

AC Discharge 

Current

Maida Development Company

www.maida.com

GDT Series

Maida    Style 

Number      

Nominal DC 

Breakdown 

Voltage

Impulse 

Breakdown 

Voltage

Insulation 

Resistance 

Capacitance 

@ 1MHz

(3 Electrode)

(V)

(V)

1X (kA)

10X (kA)

(M

Ω

)

(pF)

50B075F

75V

600

10

5

1000

1.5

5A, 5 times

50B090F

90V

600

10

5

1000

1.5

5A, 5 times

50B150F

150V

650

10

5

1000

1.5

5A, 5 times

50B230F

230V

700

10

5

1000

1.5

5A, 5 times

50B350F

350V

900

10

5

1000

1.5

5A, 5 times

50B075

75V

600

10

5

1000

1.5

5A, 5 times

50B090

90V

600

10

5

1000

1.5

5A, 5 times

50B150

150V

650

10

5

1000

1.5

5A, 5 times

50B230

230V

700

10

5

1000

1.5

5A, 5 times

50B350

350V

900

10

5

1000

1.5

5A, 5 times

50A075F

75V

600

10

5

1000

1.5

5A, 5 times

50A090F

90V

600

10

5

1000

1.5

5A, 5 times

50A150F

150V

650

10

5

1000

1.5

5A, 5 times

50A230F

230V

700

10

5

1000

1.5

5A, 5 times

50A350F

350V

900

10

5

1000

1.5

5A, 5 times

50A075

75V

600

10

5

1000

1.5

5A, 5 times

50A090

90V

600

10

5

1000

1.5

5A, 5 times

50A150

150V

650

10

5

1000

1.5

5A, 5 times

50A230

230V

700

10

5

1000

1.5

5A, 5 times

50A350

350V

900

10

5

1000

1.5

5A, 5 times

60A075

75V

600

20

10

1000

1.5

5A, 5 times

60A090

90V

600

20

10

1000

1.5

5A, 5 times

60A150

150V

650

20

10

1000

1.5

5A, 5 times

60A230

230V

650

20

10

1000

1.5

5A, 5 times

60A350

350V

800

20

10

1000

1.5

5A, 5 times

60B075

75V

600

20

10

1000

1.5

10A, 5 times

60B090

90V

600

20

10

1000

1.5

10A, 5 times

60B150

150V

650

20

10

1000

1.5

10A, 5 times

60B230

230V

650

20

10

1000

1.5

10A, 5 times

60B350

350V

800

20

10

1000

1.5

10A, 5 times

75B075F

75V

600

20

10

1000

1.5

10A, 5 times

75B090F

90V

600

20

10

1000

1.5

10A, 5 times

75B150F

150V

650

20

10

1000

1.5

10A, 5 times

75B230F

230V

700

20

10

1000

1.5

10A, 5 times

75B350F

350V

850

20

10

1000

1.5

10A, 5 times

75B470F

470V

1000

20

10

1000

1.5

10A, 5 times

75B600F

600V

1100

20

10

1000

1.5

10A, 5 times

75B075

75V

600

20

10

1000

1.5

10A, 5 times

75B090

90V

600

20

10

1000

1.5

10A, 5 times

75B150

150V

650

20

10

1000

1.5

10A, 5 times

75B230

230V

700

20

10

1000

1.5

10A, 5 times

75B350

350V

850

20

10

1000

1.5

10A, 5 times

75B470

470V

1000

20

10

1000

1.5

10A, 5 times

75B600

600V

1100

20

10

1000

1.5

10A, 5 times

80B090F

90V

600

20

10

1000

1.5

10A, 5 times

80B150F

150V

600

20

10

1000

1.5

10A, 5 times

80B230F

230V

650

20

10

1000

1.5

10A, 5 times

80B350F

350V

800

20

10

1000

1.5

10A, 5 times

80B470F

470V

1000

20

10

1000

1.5

10A, 5 times

80B090

90V

600

20

10

1000

1.5

10A, 5 times

Impulse Discharge 

Current

AC Discharge 

Current

Maida Development Company

www.maida.com

GDT Series

Maida    Style 

Number      

Nominal DC 

Breakdown 

Voltage

Impulse 

Breakdown 

Voltage

Insulation 

Resistance 

Capacitance 

@ 1MHz

(3 Electrode)

(V)

(V)

1X (kA)

10X (kA)

(M

Ω

)

(pF)

80B150

150V

600

20

10

1000

1.5

10A, 5 times

80B230

230V

650

20

10

1000

1.5

10A, 5 times

80B350

350V

800

20

10

1000

1.5

10A, 5 times

80B470

470V

1000

20

10

1000

1.5

10A, 5 times

68B230

230V

700

20

10

1000

1.5

10A, 5 times

68B350

350V

850

20

10

1000

1.5

10A, 5 times

68B400

400V

950

20

10

1000

1.5

10A, 5 times

Maida    Style 

Number      

Nominal DC 

Breakdown 

Voltage

Impulse 

Breakdown 

Voltage

Insulation 

Resistance 

Capacitance 

@ 1MHz

(SMD)

(V)

(V)

1X (kA)

10X (kA)

(M

Ω

)

(pF)

5T090

90V

600

10

5

1000

1.5

5A, 5 times

5T230

230V

650

10

5

1000

1.5

5A, 5 times

5T350

350V

850

10

5

1000

1.5

5A, 5 times

5T420

420V

950

10

5

1000

1.5

5A, 5 times

6T090

90V

600

10

5

1000

1

5A, 5 times

6T230

230V

650

10

5

1000

1

5A, 5 times

6T350

350V

850

10

5

1000

1

5A, 5 times

6T1200

1200V

1600

10

5

1000

1

5A, 5 times

6T0901

90V

600

2

1

1000

0.8

1A, 5 times

6T1501

150V

600

2

1

1000

0.8

1A, 5 times

6T2301

230V

650

2

1

1000

0.8

1A, 5 times

6T3001

300V

800

2

1

1000

0.8

1A, 5 times

6T3501

350V

850

2

1

1000

0.8

1A, 5 times

6T4001

400V

950

2

1

1000

0.8

1A, 5 times

Impulse Discharge 

Current

AC Discharge 

Current

Impulse Discharge 

Current

AC Discharge 

Current

Maida Development Company

www.maida.com

GDT Series