Features
■ Heavy duty design
■ High frequency DC-4 GHz
■ DC Pass to ±48 V
■ VSWR <1.2
■ Low insertion loss <0.1 dB
■ Bidirectional
■ Water resistant
■ Replaceable gas tube
■ Three grounding options
■ RoHS compliant*
■ Listed (File: E360007)
1977 Series High Frequency Coaxial SPD
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specifi c applications.
The Bourns® Model 1977 Series Coaxial Surge Protective Device (SPD) has been designed to provide heavy duty protection for
antennas, broadband, microwave, GPS, cellular and CATV applications against surges caused by lightning and other electrical
transients.
Electrical Characteristics
General Characteristics
Environmental Characteristics
Characteristic Model No.
1977-09-xxx 1977-25-xxx 1977-50-xxx
Frequency Range DC-4 GHz
DC Turn-On (Breakdown) 90-130 V 200-300 V 400-600 V
Technology Gas Discharge Tube
Insertion Loss ≤0.2 db
Return Loss ≥20 db
VSWR <1.2:1
Ipeak (8/20 μs) 20 kA
Maximum Power 25 W 190 W 780 W
Maximum Current 10 A
Impedance 50 ohms 1
Characteristic Model No.
1977-09-xxx 1977-25-xxx 1977-50-xxx
Connection Method Series (Bidirectional)
Connectors N, F
Grounding M6 Screw, Bulkhead, Bracket
Weight 4.4 oz.
Characteristic Model No.
1977-09-xxx 1977-25-xxx 1977-50-xxx
Environmental Rating IP 65
Operating Temperature -50 °C to +85 °C
Operating Altitude 13,000 ft. (4,000 m)
Relative Humidity Up to 5-95 %
Non-condensing: Up to 100 %
General Information
1 Impedance for F-Type Connector is 75 ohms.
Asia-Pacifi c: Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
Europe: Tel: +41-41 768 5555 • Fax: +41-41 768 5510
The Americas: Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
*RoHS COMPLIANT
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specifi c applications.
1977 Series High Frequency Coaxial SPD
Product Dimensions
DIMENSIONS: MM
(INCHES)
REV. 09/13
How To Order
1977 - xx - xxx
Series
DC Turn-On
09 = 90-130 V
25 = 200-300 V
50 = 400-600 V
Connector Type
A00 = N-type Female/Female
A01 = N-type Male/Female
A02 = F-type Female/Female
A03 = F-type Male/Female
Applications
■ Multi-point radio and backhaul bridges
■ Tower Mounted Amplifi ers (TMA)
■ Antenna systems
■ Tower Top Electronics (TTE)
■ Transmitters and recievers
■ WiFi
■ Wimax broadband wireless
26.0
(1.161)
DIA.
16.2
(.638)
25.0
(.984)
64.0
(2.520) 16.0
(.630)
13.8
(.543)
MOUNTING HOLE
1977-xx-A00
26.0
(1.161)
DIA.
10.0
(.446)
15.0
(.591)
51.0
(2.008) 12.0
(.472)
8.7
(.342)
MOUNTING HOLE
26.0
(1.161)
DIA.
16.2
(.638)
25.0
(.984)
68.0
(2.677) 20.0
(.787)
13.8
(.543)
MOUNTING HOLE
26.0
(1.161)
DIA.
10.0
(.446)
15.0
(.591)
57.0
(2.244) 19.0
(.748)
8.7
(.342)
MOUNTING HOLE
1977-xx-A02
1977-xx-A01
1977-xx-A03
Examples:
1977-09-A00 .......................................Coax, DC to 4 GHz, N, FF, 25 W
1977-09-A01 ...................................... Coax, DC to 4 GHz, N, MF, 25 W
1977-09-A02 ........................................Coax, DC to 4 GHz, F, FF, 25 W
1977-09-A03 .......................................Coax, DC to 4 GHz, F, MF, 25 W
1977-25-A00 .....................................Coax, DC to 4 GHz, N, FF, 190 W
1977-25-A01 .................................... Coax, DC to 4 GHz, N, MF, 190 W
1977-25-A02 ......................................Coax, DC to 4 GHz, F, FF, 190 W
1977-25-A03 .....................................Coax, DC to 4 GHz, F, MF, 190 W
1977-50-A00 .....................................Coax, DC to 4 GHz, N, FF, 780 W
1977-50-A01 .................................... Coax, DC to 4 GHz, N, MF, 780 W
1977-50-A02 ......................................Coax, DC to 4 GHz, F, FF, 780 W
1977-50-A03 .....................................Coax, DC to 4 GHz, F, MF, 780 W
