Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Protection type | 2-electrode ceramic gas discharge tube |
| Mounting | Surface mount, tape and reel |
| Nominal DC sparkover | 350 V at 100 V/s |
| DC sparkover tolerance | ±20% |
| Surge rating | 5 kA, 8/20 µs, 10 hits |
| Capacitance | <1 pF |
| Dimensions | 7.0 × 3.7 × 1.3 mm nominal |
| Operating temperature | -40°C to +90°C |
Product Overview
The GTCS26-351M-R05-2 is the surface-mount tape-and-reel implementation of Littelfuse’s 6 mm two-electrode GTCX26 gas-discharge-tube family with a nominal 350 V DC sparkover rating. Its exact part-number fields identify the 350 V voltage code, ±20% tolerance, R05 5 kA surge class and surface-mount package form.
For the 351M voltage code, Littelfuse specifies maximum impulse sparkover of 900 V at 100 V/µs and 1000 V at 1000 V/µs. The device family also combines a 5 kA 8/20 µs surge rating with less than 1 pF capacitance, which is useful where transient protection must add very little shunt capacitance to a signal line.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Electrode configuration | 2 electrode |
| Body class | 6 mm ceramic GDT |
| DC sparkover at 100 V/s | 350 V nominal, ±20% |
| Impulse sparkover at 100 V/µs | 900 V maximum |
| Impulse sparkover at 1000 V/µs | 1000 V maximum |
| DC holdover | <150 V |
| On-state voltage | 20 V nominal at 1 A |
| Impulse discharge current | 5 kA, 8/20 µs, 10 hits |
| Impulse life | 100 A, 10/1000 µs, 300 hits |
| AC discharge current | 5 Arms, 1 second, 10 hits |
| Capacitance | <1 pF at 1 MHz |
| Insulation resistance | 10,000 MΩ |
| Nominal body dimensions | 7.0 × 3.7 × 1.3 mm |
| Operating/storage temperature | -40°C to +90°C |
| Order form | Surface-mount tape and reel (-2) |
Design Considerations
A GDT normally sits above the protected circuit’s normal working voltage, so the 350 V nominal sparkover and ±20% tolerance need to be coordinated with both the maximum continuous voltage and the downstream clamp/protection stage. The impulse sparkover voltage is much higher than the nominal DC value during fast transients and should be included in insulation and secondary-protection analysis.
The -2 suffix is a packaging distinction for the surface-mount tape-and-reel form. Preserve that exact order code for automated assembly and sourcing rather than collapsing it to the base GTCX26 family.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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