L521F Crydom - Power Transistor Module

L521F Description

Rated at 120 V and 25 A, the Crydom L521F is a solid state relay. It is widely used for heater control, motor switching, lighting and process equipment where mechanical contacts would wear out.

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Summary of Features

Target Applications

Crydom L521F is used for AC/DC power conversion and control: controlled rectifiers, DC motor drives, heater and power control, battery chargers and power supplies.

Key Specifications

Crydom L521F is an L Series low-profile PCB-mount SCR/diode power module, 25 A, circuit type 2, 120 VAC line, with free wheeling diode. Source: Crydom L Series datasheet (Rev 121411). Values at 25°C unless noted.

Parameter	Value
Maximum DC output current (Tc = 85°C)	25 A
AC line input voltage	120 Vrms (400 VRRM)
Circuit type	2 (see datasheet schematic)
Maximum voltage drop (VF)	1.65 V @ 25 A
Maximum non-repetitive surge current (1/2 cycle, 60 Hz)	300 A
Maximum I²t for fusing (8.3 ms)	375 A²s
Critical rate of rise of on-state current (Tj = 125°C)	100 A/µs
Critical rate of rise of off-state voltage	500 V/µs
Gate trigger current / voltage (25°C)	60 mA / 2.5 V
Average gate power	0.5 W
Maximum peak reverse gate voltage	5.0 V
Maximum thermal resistance, junction to ceramic base per chip	0.9 °C/W
Operating junction temperature	-40 to 125°C
Isolation voltage	2500 Vrms
Weight (typical)	0.5 oz (14.4 g)

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