T2117-3ASY Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
T2117-3ASY is a zero-voltage switching controller IC from Microchip with an adjustable ramp generator, designed to synchronize AC load switching at the voltage zero-crossing to minimize EMI and surge currents, in a DIP package. It operates at 50 Hz or 60 Hz line frequencies and suits resistive heating element controllers, lamp dimmers, and solid-state relay driver circuits.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- T2117-3ASY Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Zero-voltage switching synchronization at 50 Hz and 60 Hz line frequency
- Adjustable ramp generator for controlled soft-start firing angle
- Low EMI switching by triggering at AC voltage zero-crossing
- Compatible with TRIAC and SCR gate drive circuits
- DIP package for through-hole prototyping and industrial board assembly
- Single-supply operation simplifying gate driver interface design
Applications
The T2117-3ASY is used in resistive heating element controllers, industrial furnace temperature regulators, and halogen or incandescent lamp dimmer circuits where zero-voltage switching eliminates conducted EMI on the AC line. Its adjustable ramp generator allows designers to set the firing angle ramp rate for smooth power transitions in solid-state relay applications. It also fits motor soft-start circuits and domestic appliance speed controls where surge current reduction at switch-on extends device lifetimes.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why does T2117-3ASY use zero-voltage switching and how does that reduce EMI in AC load controllers?
T2117-3ASY triggers the output gate drive precisely at the AC waveform zero-crossing, which eliminates the high di/dt transients that occur when switching at non-zero voltage, reducing conducted and radiated EMI on 50 Hz or 60 Hz mains by tens of dB compared to phase-angle controllers that fire at arbitrary voltage levels.
How is the adjustable ramp of T2117-3ASY configured and what does it control in a heating-element design?
An external resistor-capacitor network connected to the ramp pin of T2117-3ASY sets the ramp rate and burst period, allowing the designer to control how many AC half-cycles are enabled per second, giving smooth power delivery to resistive heating elements rated from a few hundred watts to several kilowatts without abrupt thermal cycling.
For a solid-state relay design, what gate current drive capability should be paired with T2117-3ASY to control a TRIAC?
T2117-3ASY provides a zero-crossing logic pulse that must be buffered by a gate driver or opto-TRIAC capable of sourcing 50 mA to 100 mA gate current to reliably trigger standard TRIAC devices rated above 4 A; the DIP package allows direct through-hole integration alongside the gate drive buffer on a simple single-layer industrial PCB.
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