STMicroelectronics FLC10-200B

Overview

FLC10-200B from STMicroelectronics is a monolithic fire lighter circuit integrating a thyristor, zener diode, diode, and 2 kΩ resistor in a single DPAK package. It delivers 240 A peak pulse current at 10 µs, operates up to +120 °C ambient, and features 200–250 V breakover voltage (V_BO) with ±10⁻⁴/°C temperature coefficient. It is designed for capacitance discharge ignition in gas cookers and boilers.

For engineers reviewing the FLC10-200B datasheet, FLC10-200B pinout, FLC10-200B application, or FLC10-200B equivalent, key selection criteria include verified 240 A surge capability at 120 °C, DPAK thermal resistance of 70 °C/W (S = 0.5 cm²), integrated Z-D-Th-R functional block, and strict compliance with high-temperature ignition timing requirements in mains-powered gas appliances.

Technical Context

The FLC10-200B implements a self-triggering capacitance discharge ignition topology: mains AC is rectified, charges a capacitor via D_s, and fires the integrated thyristor when capacitor voltage reaches the zener's V_BO threshold. The gate current path includes the internal zener and resistor, eliminating external trigger components.

Its planar silicon structure supports repetitive 240 A pulses at 10 µs with 200 A/µs critical rate-of-rise (dI/dt), while the integrated diode handles reverse conduction during alternating spark current flow through the HV transformer primary. Junction temperature is rated to +125 °C with storage up to +150 °C.

Key Specifications

Pinout & Package

The FLC10-200B is housed in a lead-free, UL94 V0-compliant DPAK package (TO-252) with exposed tab for thermal dissipation. Pin 1 and Pin 3 are internally shorted and must be externally connected together in PCB layout; Pin 2 (and tab) serves as common cathode/anode reference.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitance discharge ignition applications.

Compared with FLC10-200H, the FLC10-200B offers superior thermal management in confined spaces but lower mechanical ruggedness; versus STTH1L06, it delivers full functional integration at the cost of design flexibility - making it optimal for high-volume, space-constrained gas appliance production.

Availability

FLC10-200B is available at Aetrix Electronics and suitable for gas cooker ignition, gas boiler pilot light control, and commercial food warmer ignition requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature extremes.

Supply support for FLC10-200B 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The FLC10 series belongs to ST's dedicated power discrete and protection portfolio, engineered specifically for high-reliability, high-temperature ignition systems in mains-powered gas appliances - prioritizing monolithic integration, thermal resilience, and field-proven surge endurance.

FAQ

What is the maximum allowable Rs resistor value for reliable firing at minimum mains voltage?

The maximum Rs value is calculated using Equation (1) from the datasheet: Rs_max = [(V_{AC min}²) / (V_{BO max} × (1 + α_T × (T_amb − 25)))] / (k × I_BO). For V_{AC min} = 180 V_RMS, V_{BO max} = 250 V, T_amb = 120 °C, α_T = 13×10⁻⁴/°C, k = 2.5 (from Figure 4), and I_BO = 0.5 mA, Rs_max ≈ 12.3 kΩ. Exceeding this risks misfire under worst-case conditions.

Can FLC10-200B be used in 115 V AC systems?

Yes - the device's V_BO range (200–250 V) and internal 2 kΩ resistor allow adaptation to 115 V AC mains by adjusting external Rs and C values. Per Figure 6, using Rs = 6.8 kΩ and C = 2.2 µF achieves ~5 Hz spark frequency at 115 V_RMS, provided V_BO remains above peak rectified voltage (≈162 V) to ensure reliable triggering.

Is the tab electrically isolated from the die?

No - the tab is electrically connected to Pin 2 and forms part of the internal cathode network (thyristor cathode, zener anode, diode cathode). It must be treated as a live, high-current terminal and cannot serve as a floating thermal pad. PCB layout must maintain clearance to other nets per IPC-2221A creepage requirements for 250 V working voltage.

What is the recommended solder profile for DPAK reflow?

ST specifies a peak temperature of 260 °C for 10 seconds maximum at the lead. For standard Pb-free reflow, use a profile with ramp-up ≤3 °C/s, preheat 150–200 °C for 60–120 s, soak 200–220 °C for 60–90 s, reflow peak 245–260 °C for ≤10 s, and cooling ≥6 °C/s. Avoid thermal shock - do not exceed 260 °C or dwell beyond 10 s at peak.