Electronic Design

Component Specifier: Circuit Protection


FUSES/CIRCUIT BREAKERS
TYPE/Model Features P & A Source
AXIAL-LEAD FUSE
600 series
3.6- by 10-mm glass and ceramic axial-lead fuses; performance specifications are similar to conventional 5- by 20-mm, 2AG, and 3AG fuses but in a smaller package; 250-V voltage rating; series has a range of current ratings; UL and CSA certified Starts at $0.30 each in 10,000-unit lots; five weeks Littelfuse Inc.
www.littelfuse.com
(800) 999-9445
RESETTABLE FUSE
Polyfuse HVR250 series
Polymer-based positive-temperature-coefficient (PPTC) resettable fuses; optimized to provide overcurrent protection for telecom and network equipment; coated and uncoated versions; withstands 250-V ac interrupting voltage; available for 80-mA and 180-mA hold currents $0.20 each in OEM quantities; six to eight weeks Wickmann USA Inc.
www.wickmannusa.com
(800) 553-7894
RESETTABLE FUSE
Lead-free SMD series
Lead-free surface-mount versions of the company's PolySwitch resettable fuses; includes nanoSMD, microSMD, and miniSMD C-design devices; component solderability meets standard industry specifications; can be installed using current reflow profiles; available in tape and reel packages Ranges from $0.15 to $0.25 in 100,000-unit lots; four weeks for most parts Raychem Circuit Protection
www.raychem.com
(800) 468-2023
SMT FUSE HOLDER
X-SMQ series
Surface-mount holder and fuse system for applications that need exchangeable fuses; optimized for space-sensitive devices; rated up to 125 V; available with quick-acting or time-lag fusing characteristics; current ratings range from 62 mA to 7 A $0.49 each in OEM quantities; eight to 10 weeks Wickmann USA Inc.
www.wickmannusa.com
(800) 553-7894
THERMAL CIRCUIT BREAKER
5140 series
Temperature-compensated circuit breaker targeted at aerospace applications; weighs 150 g; designed for 400-Hz, three-pole applications from 20 to 50 A; consistent trip-curve characteristics from -55° to 90°C; typical life is 5000 mechanical cycles $275 each in medium quantities; 12 to 14 weeks E-T-A Circuit Breakers
www.e-t-a.com
(847) 827-7600
SUPPRESSORS/SURGE PROTECTORS
TYPE/Model Features P & A Source
POWER BUS PROTECTOR
LVC series
DC overvoltage protector for power-supply bus; install inside a power supply or between the power supply and equipment; operates in microseconds; 7.5-V, 18-V, and 30-V trip voltages available for 7-A, 25-A, and 55-A applications List: starts at $26. Quantity discounts available. MCG Surge Protection
www.mcgsurge.com
(800)851-1508
GAS ARRESTER
R-28/R-38 series
Designed for surge protection in telecom and data-line applications; withstands 10,000-A surges, 10-A ac discharge currents, and 100-A impulse surges; leaded and unleaded configurations; breakdown voltages range from 90 to 4500 V dc Ranges from $0.49 to $0.84 each in OEM quantities; stock Okaya Electric America Inc
www.okaya.com
(800) 852-0122
ESD SUPPRESSOR
0603ESDA
Surface-mount electrostatic discharge (ESD) suppressor for high-speed data lines; no signal distortion at frequencies in excess of 6 GHz; capacitance goes as low as 0.15 pF; 0.1-nA leakage current; protects against 15-kV ESD; handles peak currents up to 45 A Starts at $0.06 each in 10,000-unit lots; stock Cooper Electronic Technologies
www.cooperet.com
(888) 414-2645
COMPACT SILICON SUPPRESSOR
I2R Storm series
Compact 35-mm DIN-mount silicon suppressor; measures 1.8 by 6 by 3.5 cm; protects at 330 V and 500 V on 120-V ac and 240-V ac systems, respectively; surge-current ratings exceed 5000 A; isolated contacts in European-style terminal plug Starts at about $600 each; stock to two weeks Transtector Systems
www.transtector.com
(208) 772-8515
EMI FILTER/TVS ARRAY
EMIF6-100FC
Six-line low-pass EMI-filter and transient-voltage-suppression (TVS) array flip-chip; targeted at portable electronics; leakage current is less than 0.2 µA per line; rejects EMI/RFI signals in the 800-MHz to 3-GHz range $0.31 each in 10,000-unit lots; samples available from stock ProTek Devices
www.protekdevices.com
(602) 431-8101


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