STMicroelectronics BTA04-700SRG

Overview

BTA04-700SRG from STMicroelectronics is a sensitive-gate, insulated TRIAC rated for 4 A RMS on-state current and 700 V repetitive peak off-state voltage (VDRM/VRRM), with maximum gate trigger current of 10 mA and holding current of 15 mA, used in phase-control dimming and static AC switching circuits operating at 50/60 Hz.

For engineers reviewing the BTA04-700SRG datasheet, BTA04-700SRG pinout, BTA04-700SRG application, or BTA04-700SRG equivalent, key selection criteria include quadrants I–IV triggering capability, dI/dt rating of 10 A/µs (repetitive), thermal resistance Rth(j-c) of 4.4 °C/W, and TO-220AB insulated package compliance with UL E81734.

Technical Context

This TRIAC employs a glass-passivated PNPN structure optimized for high sensitivity across all four quadrants, enabling reliable triggering with low gate drive (IGT ≤ 10 mA in QI/QII/QIII, ≤25 mA in QIV). Its 700 V blocking voltage supports operation in 230 VAC mains environments with margin against transients.

Thermal design relies on DC junction-to-case resistance of 4.4 °C/W and 3.3 °C/W under full-conduction AC conditions, requiring heatsinking for sustained 4 A loads. Critical dV/dt immunity is ≥10 V/µs (QIII/QIV) and dI/dt capability reaches 50 A/µs non-repetitive.

Key Specifications

Pinout & Package

Supplied in TO-220AB plastic package with insulated mounting base (UL recognized E81734, 2500 V_RMS isolation), 2.3 g weight, and recommended torque of 0.8 m·N for heatsink attachment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sensitive-gate TRIAC applications.

Compared with BTB04-700SW and MAC4DHM-700, BTA04-700SRG uniquely combines UL-recognized 2500 V_RMS insulation, 10 mA IGT sensitivity, and 4.4 °C/W thermal resistance-making it optimal for space-constrained, safety-certified AC control where direct chassis mounting and low-drive compatibility are mandatory.

Availability

BTA04-700SRG is available at Aetrix Electronics and suitable for light dimming control, heating element regulation, and static AC switching requiring stable component supply and long-term industrial availability.

Supply support for BTA04-700SRG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The BTA/BTB04 series was developed specifically for cost-sensitive, high-reliability AC power control applications demanding low gate drive, robust surge handling, and certified insulation in compact TO-220AB packages.

FAQ

What is the maximum allowable case temperature for continuous 4 A operation?

The datasheet specifies IT(RMS) = 4 A at Tc = 90°C for the BTA04-700SRG. Exceeding this temperature requires derating per Figure 4; sustained operation above 90°C risks thermal runaway due to the 4.4 °C/W junction-to-case resistance and positive temperature coefficient of on-state voltage.

Can BTA04-700SRG be triggered directly by a 3.3 V microcontroller GPIO?

No-direct connection is unsafe. While VGT ≤ 1.5 V, the gate requires ≥10 mA IGT and tolerates only 16 V transient (VGM). A current-limiting resistor (e.g., 220 Ω) plus optocoupler isolation (e.g., MOC3021) is required to protect the MCU and ensure reliable QI–QIV triggering.

Is heatsinking mandatory for 2 A RMS load operation?

Yes-even at 2 A, junction temperature rise exceeds safe limits without heatsinking. With Rth(j-a) = 60 °C/W, ambient 25°C operation would yield ΔT = 2 A² × 1.65 V × 60 ≈ 396°C, far exceeding 150°C max Tj. A minimum heatsink providing Rth(c-a) ≤ 15 °C/W is required for reliable 2 A use.

Does BTA04-700SRG support snubberless operation?

It is not rated for snubberless operation. The datasheet specifies minimum dV/dt = 10 V/µs (QIII/QIV) and recommends RC snubbers for inductive loads. Without external protection, voltage transients exceeding this rate-common in motor or transformer switching-will cause false triggering and device failure.