Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Protection type | Surface-mount gas discharge tube |
| Typical DC breakdown | 90 V at 100 V/s |
| DC breakdown range | 72 V to 108 V |
| Impulse breakdown at 100 V/µs | 600 V maximum |
| Impulse breakdown at 1000 V/µs | 700 V maximum |
| Insulation resistance | 1 GΩ at 50 V for the SH75/SH90 table group |
| Capacitance | 0.7 pF for the SH75/SH90 table group |
| Operating temperature | -40°C to +90°C |
Product Overview
The SH90 is a Littelfuse surface-mount gas discharge tube with a 90 V typical DC breakdown rating. The exact SH90 row specifies a 72 V minimum and 108 V maximum static breakdown window, while the dynamic breakdown limit rises to 600 V at 100 V/µs and 700 V at 1000 V/µs.
The SH series is designed as a low-capacitance surge-protection family. In the datasheet table, SH75 and SH90 share the 1 GΩ insulation-resistance and 0.7 pF capacitance grouping. These shared values are useful for evaluating signal loading, while the 90 V exact-row breakdown values determine the voltage coordination for SH90.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| DC breakdown at 100 V/s | 72 V min, 90 V typ, 108 V max |
| Impulse breakdown at 100 V/µs | 600 V maximum |
| Impulse breakdown at 1000 V/µs | 700 V maximum |
| Insulation resistance | 1 GΩ at 50 V, shared SH75/SH90 table value |
| Capacitance | 0.7 pF, shared SH75/SH90 table value |
| DC holdover | 52 V |
| Surge-life group | 10 shots at 5 kA; one shot at 6 kA for the applicable early SH group |
| Operating/storage temperature | -40°C to +90°C |
| Mounting | Surface mount |
Design Considerations
Use the 72–108 V DC breakdown window to ensure the GDT does not fire during the highest legitimate line voltage. For fast surges, coordinate the downstream circuit against the 600–700 V impulse-breakdown limits rather than assuming clamping begins near 90 V.
The shared SH75/SH90 capacitance and insulation values come from a grouped datasheet table, not a separately measured unique SH90 line item. Preserve that distinction when comparing the device against another exact GDT model.
Related Engineering Resources
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