2pcs BT136-600e triac

🔹 2PCS BT136-600E – 600V 4A TRIAC (TO-220 Package)

A standard 4-quadrant TRIAC (Triode for Alternating Current) designed for AC power control applications. The BT136-600E can switch up to 4A RMS of AC current at voltages up to 600V, making it ideal for phase-control dimming, motor speed regulation, and AC load switching in appliances and industrial controls.

✅ Specifications:

• Part Number: BT136-600E (600V, Snubberless variant)

• Type: TRIAC (Bidirectional AC Switch)

• Repetitive Peak Off-State Voltage (Vdrm): 600V

• RMS On-State Current (IT(RMS)): 4A

• Non-Repetitive Peak On-State Current (ITSM): 32A (for one 10ms half-sine wave)

• Gate Trigger Current (IGT): 5mA to 35mA (Typical, for all quadrants)

• Gate Trigger Voltage (VGT): Max 1.3V

• On-State Voltage (VT): ~1.55V (Typical at IT=4A)

• Critical Rate of Rise of Off-State Voltage (dv/dt): 50 V/µs (Minimum) – Snubberless version offers improved commutation.

• Package: TO-220 (Insulated tab version common, tab is isolated from the die)

• Pinout (TO-220, front view, tab facing you):

  1. Main Terminal 2 (MT2) – Often connects to the AC load.

  2. Main Terminal 1 (MT1) – Often connects to the AC source.

  3. Gate (G) – Control terminal.
     *Verify with datasheet as some manufacturers may use MT1/MT2 reversed.*

• Operating Junction Temperature: -40°C to +125°C

• Quantity: 2 pieces

⚙️ Key Features:

• Snubberless Design: Improved commutation and reduced dv/dt susceptibility, often allowing use without an RC snubber network in resistive and some inductive loads.

• 4-Quadrant Operation: Can be triggered with either positive or negative gate current relative to MT1, simplifying gate drive circuits.

• Sensitive Gate: Low gate trigger current allows direct driving from microcontrollers (via an optocoupler or driver) for isolation.

• Isolated Tab: The TO-220 tab is electrically isolated from the internal die, simplifying heatsink mounting (no insulating pad required).

• Robust for AC Switching: Designed specifically for 50/60 Hz AC mains control.

📦 Typical Applications:

• Light Dimming: Phase-control dimmers for incandescent and halogen lamps.

• AC Motor Speed Control: For universal (brushed) motors in drills, fans, and small appliances.

• Solid-State Relays (SSR): As the output switching element in DIY or commercial SSRs.

• Heater Control: Proportional power control for heating elements.

• Appliance Control: Switching solenoids, valves, or pumps in white goods and industrial equipment.

🔧 Basic Phase-Control Circuit (with DIAC Trigger):

1. Gate Drive: The TRIAC is typically triggered using a DIAC (e.g., DB3) in series with an RC timing network. A potentiometer adjusts the RC charge time, determining the phase angle at which the TRIAC fires each half-cycle.

2. Isolation: For safety, the low-voltage control circuit MUST be isolated from the AC mains using an optocoupler (e.g., MOC3021) or a transformer.

3. Basic Snubber: Even with a snubberless TRIAC, an RC snubber network (e.g., 100Ω + 10nF) across MT1 and MT2 is highly recommended for inductive loads to suppress voltage spikes.

4. Heatsinking: For continuous operation near 4A, attach the TRIAC to an adequately sized heatsink. The isolated tab makes this easier.

⚠️ CRITICAL Safety & Usage Warnings:

• AC MAINS HAZARD: This device is designed to switch HIGH-VOLTAGE AC MAINS (110V/220V). Extreme caution is required. Design must include proper isolation, fusing, and enclosure. Assume all terminals are at lethal voltage when connected.

• Inductive Loads: Switching motors or transformers is challenging. Use a snubber, and ensure the load current is well within ratings. Inductive loads can cause high dv/dt and commutation failures.

• Heat Dissipation: Calculate power dissipation (P≈VT×IRMSP≈VT​×IRMS​) and provide a sufficient heatsink. At 4A, dissipation is ~6W.

• Gate Sensitivity: Avoid noise on the gate trigger line. Keep gate traces short and use a gate resistor (e.g., 100Ω) close to the TRIAC.

• MT1 vs. MT2: For optimal performance, especially with inductive loads, connect MT2 to the side of the AC line that will have the larger voltage swing (usually the load side).