Infineon Technologies TD251N18KOFHPSA1

Overview

TD251N18KOFHPSA1 from Infineon Technologies is a phase-control thyristor module designed for high-power AC line switching in industrial power electronics. It delivers 250 A average on-state current at 85 °C case temperature, supports 1800 V repetitive peak off-state voltage (VRRM/VDRM), and features pressure-contact construction with electrically insulated baseplate for crowbar, soft starter, and static switch applications.

For engineers reviewing the TD251N18KOFHPSA1 datasheet, TD251N18KOFHPSA1 pinout, TD251N18KOFHPSA1 application, or TD251N18KOFHPSA1 equivalent, key selection criteria include surge current rating (9100 A), junction-to-case thermal resistance (0.124 K/W), gate trigger parameters (IGT ≤ 200 mA, VGT ≤ 2.0 V), and isolation test voltage (3.6 kV RMS/1 sec).

Technical Context

This dual-thyristor module operates in phase-controlled rectification and AC power control topologies, supporting both two-pulse (B2) and six-pulse (B6) bridge configurations. Its pressure-contact die attachment ensures stable thermal performance under high di/dt (250 A/µs) and dv/dt (1000 V/µs) stress, with commutated turn-off time of 250 µs at rated conditions.

The module integrates electrically isolated AlN-ceramic baseplate (Class I insulation per IEC61140), enabling direct heatsink mounting without additional insulators. Gate drive requirements are defined for 12 V anode-cathode voltage, with latching current ≤ 1200 mA and holding current ≤ 300 mA - critical for reliable triggering in motor drive and UPS rectifier circuits.

Key Specifications

Pinout & Package

TD251N18KOFHPSA1 is housed in an industrial-standard pressure-contact module package with electrically insulated AlN ceramic baseplate (50 mm × 50 mm footprint), M1 mechanical mounting screws (5 Nm torque), and M2 terminal screws (12 Nm torque) for main and gate connections. Weight: 800 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar phase-control thyristor module applications.

Compared with TT251N18KOFHPSA1 and TD251N16KOFHPSA1, TD251N18KOFHPSA1 provides the highest voltage blocking margin (1800 V) while retaining identical thermal and gate drive behavior - making it optimal for mission-critical 1000 VAC industrial drives and grid-tied UPS systems.

Availability

TD251N18KOFHPSA1 is available at Aetrix Electronics and suitable for soft starters, UPS rectifiers, battery chargers, and static switches requiring stable component supply across multi-year industrial equipment lifecycles.

Supply support for TD251N18KOFHPSA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power semiconductors, microcontrollers, and sensor solutions for industrial, automotive, and energy markets.

This part belongs to Infineon's high-power thyristor module product line, engineered specifically for robust phase-controlled AC power conversion in harsh industrial environments - emphasizing reliability under repeated surge stress and long-term thermal cycling.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum case temperature (Tc op) is +125 °C, but the rated average on-state current (ITAVM = 250 A) is specified at TC = 85 °C. Operation above 85 °C requires derating per the ITAVM vs. TC curve on page 7 of the datasheet - e.g., ~180 A at 110 °C for 180° conduction angle in sinusoidal current.

Does TD251N18KOFHPSA1 require external gate resistors?

Yes - a series gate resistor (typically 10–33 Ω) is required to limit peak gate current and ensure reliable triggering within the specified IGT ≤ 200 mA and VGT ≤ 2.0 V limits. The resistor also damps oscillations caused by gate-cathode capacitance and PCB trace inductance.

Can this module be used in parallel configurations?

No - TD251N18KOFHPSA1 is not characterized or recommended for paralleling. Its pressure-contact design and inherent parameter spread (e.g., V(TO), rT) make current sharing unreliable without active balancing, which is not supported by the module's internal architecture or datasheet guidance.

What is the creepage distance and why does it matter?

The creepage distance is 17 mm between terminals and baseplate. This value ensures safe isolation in polluted industrial environments per IEC 60664-1, preventing surface tracking failure - especially critical when mounted on grounded heatsinks in high-humidity or dust-laden settings like factory automation cabinets.