SG90
Littelfuse
Needs validationhigh risk
Littelfuse SG90 matches the 1812 90V form but has a lower 2kA surge rating.
Best Alternatives to SMD4532-090NF
SMD4532-090NF is a 90V 3kA 1812 SMD GDT. Alternatives must be checked for surge rating, pad fit, and pinout.
AI replacement insight
Electrical riskhigh
surge current must meet 3kA
Package riskmedium
1812 size does not prove pad fit
Firmware risklow
passive GDT
Sourcing riskmedium
some options are external only
Can it be replaced directly?
No pin-compatible replacement is verified from the provided data.
Best replacement path
Start with B88069X9231T253, then confirm pad pattern, pinout, and temperature.
Main risk
Several 90V 1812 candidates are only 2kA, below the 3kA target.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | SMD4532-090NF | B88069X9231T253 | SG90 | 2051-09-SM-RPLF | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 1812 | 4.5x3.2x2.7mm SMD | 4.5x3.2x2.7mm | 2.7x3.2x4.5mm SMD | 4.5x3.2x2.7mm SMD / 2.7x3.2x4.5mm SMD / 4532 SMD — same nominal size; SG90: same size; 2051-09-SM-RPLF: same dimensions; 4532-091-LF: datasheet evidence |
| Pinout | 2 poles | 2 electrodes; pin_count 0 | 2 electrodes | 2 pins | 2 electrodes; pin_count 0 / 2 pins / 2-electrode; pin_count 0 — catalog gap; SG90: pin count 2; 2051-09-SM-RPLF: ES lists 2; 4532-091-LF: catalog gap |
| Voltage | 90V ±30% | 90V ±30% | 90V | 90V ±30% | 90V ±30% — sparkover match; SG90: breakdown match; 2051-09-SM-RPLF: sparkover match; 4532-091-LF: sparkover match |
| Current | 3kA 8/20us | 3kA 8/20us | 2kA | 2kA | 3kA 8/20us / 2kA — surge match; SG90: downgrade; 2051-09-SM-RPLF: downgrade; 4532-091-LF: downgrade |
| Temperature | -40 to +90C | not in ES | -40 to +90C | -40 to +125C | not in ES / -40 to +90C / -40 to +125C — verify; SG90: range match; 2051-09-SM-RPLF: range covers |
| Lifecycle | Active | - | - | - | New Product — available status |
Application & sourcing insights
Questions & answers
B88069X9231T253 is the closest rated candidate, but pad, pinout, and temperature still need FAE review.