STMicroelectronics T435T-600FP, TRIAC Alternistor - Snubberless, Single, 600 V Off State, 4 A RMS, Through Hole, TO-220-3 Full Pack, -40°C to 125°C.
| Parameter | Value |
|---|---|
| Triac type | Alternistor - Snubberless |
| Mounting | Through Hole |
| Voltage - off state | 600 V |
| Voltage - gate trigger (Vgt) | 1.3 V |
| Current - hold (Ih) | 35 mA |
| Current - gate trigger (Igt) | 35 mA |
| Current - on state (It (RMS)) | 4 A |
| Current - non rep. surge 50, 60Hz | 30A, 32A |
| Operating temperature | -40°C ~ 125°C (TJ) |
| Package | Tube |
| Configuration | Single |
| Case | TO-220-3 Full Pack |
The STMicroelectronics T435T-600FP is a 4 A RMS, 600 V off-state Alternistor triac in a TO-220 Full Pack isolated package. The Snubberless (Alternistor) construction means it commutates inductive loads — motors, solenoids, transformers — without the external RC snubber that standard triacs need, saving two passives and a chunk of board space. Gate trigger current is 35 mA max, holding current 35 mA max.
No lead (Pb) in the solder plating or mold compound.
The datasheet is available from STMicroelectronics directly or through any semiconductor distributor listing the part. The key ratings are summarized on this page: 600 V off-state, 4 A RMS, Alternistor Snubberless, TO-220 Full Pack.
The T435-600T is a functional equivalent — same 600 V, 4 A, Snubberless Alternistor triac in a standard TO-220 (non-isolated) package. If you need the isolated TO-220 Full Pack, the T435T-600FP is the correct variant. The T405Q-600H is a sensitive-gate alternative but requires a different gate drive (5 mA Igt vs 35 mA).
Basic go/no-go: apply a 3-5 V DC pulse between gate and MT1 through a 100-220 ohm series resistor while the main terminals are connected to a low-voltage AC source (e.g., 24 VAC through a 100 W lamp). The triac should latch on and stay conducting until the AC cycle crosses zero. Check for gate trigger at 35 mA and holding current below 35 mA.
Yes, the T435T-600FP is ROHS3 compliant, meeting the latest EU RoHS directive requirements.
Yes, the Snubberless Alternistor design is well-suited for AC motor control — it commutates inductive loads without an external snubber. The 4 A RMS rating covers small fans, pumps, and fractional-horsepower motors. For larger motors, step up to the 12 A T1235H-6I.