Littelfuse SH75 SH Series Surf...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$43.63
Littelfuse SH75 SH Series Surface Mount Gas Discharge Tube Surge Arrestor

Littelfuse SH75 SH Series Surface Mount Gas Discharge Tube Surge Arrestor

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Model: SH-75

In Stock (leaves warehouse same day if ordered before 3pm ET)

$43.63
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Littelfuse SH75 SH Series Surface Mount Gas Discharge Tube Surge Arrestor

The Littelfuse SH75 SH Series is a surface mount gas discharge tube (GDT) surge arrestor engineered to protect sensitive broadband and telecom circuits from transient voltage surges. Featuring a nominal DC sparkover voltage of 75V, an impulse discharge current rating of 5kA (8/20µs), and ultra-low capacitance of 0.5pF, this compact device delivers reliable surge protection in a squared surface mount footprint measuring just 5.0×5.0×4.2mm. Its low, stable capacitance makes it well suited for high-speed data and Ethernet port protection applications where signal integrity matters.

Key Features

  • Surface Mount Form Factor: Squared body and terminals in a compact 5.0×5.0×4.2mm footprint for space-constrained PCB layouts.
  • Ultra-Low Capacitance: Less than 0.7pF (0.5pF typical) that remains stable as signal voltage varies, preserving high-speed signal integrity.
  • 5kA Surge Capability: Impulse discharge current rating of 5kA at 8/20µs in a minimal footprint for robust transient protection.
  • Nominal DC Sparkover Voltage: 75V nominal, with a minimum sparkover of 60V and maximum DC sparkover of 90V.
  • Impulse Sparkover Voltage: Maximum of 700V at 100V/µs for fast-rising transient events.
  • Two-Electrode Construction: Standard two-electrode gas discharge tube design, non-failsafe.

Technical Specifications

  • Failsafe: No
  • Electrodes: 2
  • Max DC Spark over Voltage: 90
  • Max Impulse Sparkover Voltage @ 100V/us (V): 700
  • Capacitance (Co) (pF): 0.5
  • Surge Life (@ 100A 10/1000us): 5
  • Nom DC Sparkover (V): 75
  • Impulse Discharge Current @8/20µs (kA): 5
  • MIN Sparkover Voltage (V): 60

Typical Applications

  • Broadband Equipment
  • Satellite, CATV Equipment and Set-Top Boxes
  • G.Fast, xDSL, 10GbE, and 10/100/1000 BaseT Ethernet Port Protection
  • Industrial Automation
  • Ethernet, RS-485, and RS-232 Interfaces
  • Power Inverter and Variable Frequency Drive (VFD) Protection

Why Littelfuse?

Littelfuse engineers the SH Series to deliver dependable surge protection for demanding broadband, telecom, and industrial applications. With a compact surface mount design, ultra-low and stable capacitance, and a 5kA surge rating, the SH75 gives designers a space-efficient way to safeguard sensitive electronics against transient voltage events without compromising signal performance.

Manufacturer Resources

Littelfuse Product Catalog

Product Specs

Product Type:
Gas Discharge Tube
Configuration:
Surface Mount
Voltage Rating:
75V
Amperage Rating:
5kA
Series:
SH Series
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Surge Protection

Littelfuse SH-75 – Frequently Asked Questions

1) Will a 75V gas discharge tube clamp low enough to protect a 10/100/1000 BaseT Ethernet port?
The Littelfuse SH75 is built for exactly that duty. Its nominal DC sparkover is 75V, with a 60V minimum and 90V maximum, so it stays off during normal signalling on low voltage data lines and conducts when a transient pushes past that window. On a fast rising surge the impulse sparkover tops out at 700V at 100V/us. Littelfuse lists 10/100/1000 BaseT, 10GbE, G.Fast and xDSL port protection among its applications, along with RS-485 and RS-232 interfaces.
2) How much board space does the SH75 surge arrestor take up?
It is a squared surface mount package, body and terminals, measuring 5.0 x 5.0 x 4.2 mm. That lets you put 5kA of surge capability on a crowded PCB without going to a leaded or through-hole part.
3) Will adding a GDT to a high speed data line degrade the signal?
Capacitance is the thing that matters on a high speed line, and the SH75 is specified at less than 0.7pF with 0.5pF typical. It also stays stable as signal voltage varies, which is why it is used on Ethernet and broadband ports rather than a higher capacitance protector that would roll off the signal.
4) What surge current can the Littelfuse SH75 actually take, and how many hits?
Impulse discharge current is rated 5kA on an 8/20us waveform. Surge life is rated at 5 operations at 100A, 10/1000us. It is a two electrode design and it is non-failsafe, so it does not include a shorting mechanism at end of life.
5) Is the SH75 a failsafe gas discharge tube?
No. The SH Series SH75 is a standard two electrode GDT and is specified non-failsafe, meaning there is no integral thermal short to ground if the device degrades. If your telecom application requires a failsafe protector, you need a different device type.
6) What is the exact part number to order for a 75V Littelfuse SH Series GDT?
Order Littelfuse SH-75, the 75V member of the SH Series surface mount gas discharge tube family.
7) Can I use this GDT on CATV and set-top box inputs, or is it only for telephone lines?
Littelfuse lists satellite and CATV equipment, set-top boxes and broadband equipment as intended uses, alongside industrial automation and protection of power inverters and variable frequency drives. The low 0.5pF capacitance is what makes it workable on RF and coax-fed broadband inputs.
How fast can I get the Littelfuse SH-75 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse SH-75 come with a warranty?
Absolutely. The Littelfuse SH-75 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse SH-75?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Littelfuse SH-75 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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