Spark Logic

BTA41 insulated-tab triac connection guide

BTA41 insulated-tab triac TOP3 insulated wiring guide with power, signal assignments, and bench checks.

TOP3 insulated

3 contacts Current package

STMicroelectronics · Insulated mounting tab with three through-hole leads.

800 V repetitive peak off-state rating.

Identify the terminals and check the off state

Required

Use only an isolated 12 V DC bench supply with a 0.5 A current limit. Wire a 33 Ω, 10 W resistor as the load. Keep the gate at A1 for this check.

  • Isolated 12 V positive
    • Current-limited 12 V source positive
    • RL.1
  • Main terminal A2
  • Isolated common
    • A1 (1)
    • 12 V source return
    • 5 V gate source return
    • Voltmeter common
    • G (3)
RL 33 Ω / 10 W between Isolated 12 V positive and Main terminal A2Isolated 12 V positiveRL 33 Ω / 10 WMain terminal A2

Bench checks

  • The voltage from A2 to A1 should remain close to 12 V with the gate shorted to A1 and the load cold.

STMicroelectronics DS2111 Rev. 13, Table 2. This isolated fixture uses the table’s 12 V supply and 33 Ω load.

Connection scenarios

Trigger and release in quadrant I

Turn the supplies off. Remove the gate short and wire the momentary 5 V gate pulse through 56 Ω, 1 W, with the gate source return tied to A1. Keep the main source at 12 V and its current limit at 0.5 A.

  • Isolated 12 V positive
    • Current-limited 12 V source positive
    • RL.1
  • Main terminal A2
  • Isolated common
    • A1 (1)
    • 12 V source return
    • 5 V gate source return
    • Voltmeter common
  • Gate drive
    • Isolated 5 V source positive through momentary switch
    • RG.1
  • Gate
RL 33 Ω / 10 W between Isolated 12 V positive and Main terminal A2Isolated 12 V positiveRL 33 Ω / 10 WMain terminal A2
RG 56 Ω / 1 W between Gate drive and GateGate driveRG 56 Ω / 1 WGate

Bench checks

  • A brief pulse supplies approximately 66–89 mA to the gate and should pull the A2 voltage down while current flows through the load.
  • Remove the gate pulse. Current above the holding threshold keeps the triac on. Interrupt main supply current to reset the device.

STMicroelectronics DS2111 Rev. 13, Table 2. Gate resistor follows (5 V − 1.3 V) ÷ 56 Ω ≈ 66 mA at the maximum specified trigger voltage.

TOP3 insulated wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

TOP3 insulated
Marked front facing you with the leads down: A1, A2, G from left to right.
Selected pin details

1 · A1

Main terminal · Bidirectional

Main terminal 1. Use it as the reference for the gate circuit.

STMicroelectronics DS2111 Rev. 13, package illustration

Electrical limits · Pin in the reference

Models and documents

BTA41-600BRG and BTA41-800BRG share the insulated TOP3 pinout. The fixture below uses an isolated, current-limited DC supply.

BTA41-600BRG
600 V repetitive peak off-state rating.
BTA41-800BRG
800 V repetitive peak off-state rating.