The Crydom L522F is a low-profile, through-hole single-phase rectifier power module from Sensata Crydom’s industry-standard L Series. Designed for direct printed circuit board integration, this 25A 240VAC module comes with an integrated free-wheeling diode (F suffix) and delivers reliable performance in compact industrial power applications.
This post covers core specifications, mechanical dimensions, circuit topology, drop-in replacement models, and typical use cases of the L522F, serving as a technical reference for design engineers, maintenance technicians, and industrial component buyers.
1. Product Overview & Part Number Breakdown
The L Series is Crydom’s signature line of ultra-thin PCB-mount power modules, optimized for high-density circuit designs.
Core series features:
- Low-profile package for space-constrained layouts
- 4 selectable circuit configurations for different rectification requirements
- Standard through-hole pins for simple soldering assembly
- UL recognized (E72445) and RoHS compliant
- Wide operating temperature range for harsh industrial environments
L522F model naming explanation:
- L: L Series low-profile PCB power module
- 5: 25A rated DC output current (at Tc=85°C)
- 2: Circuit Type 2 (single-phase full-wave rectifier)
- 2: 240V AC line voltage rating
- F: Integrated free-wheeling diode included
2. Key Electrical Specifications
All parameters below are sourced from the official Crydom L Series datasheet:
| Parameter | Symbol | L522F Value |
| Max DC Output Current (Tc=85°C) | Ic | 25 A |
| Forward Voltage Drop @ 25A Peak | Vf | 1.6 V |
| Operating Junction Temperature | Tj | -40 ~ +125 °C |
| Critical di/dt (On-State Current Rise) | di/dt | 100 A/µsec |
| Critical dv/dt (Off-State Voltage Rise) | dv/dt | 500 V/µsec |
| AC Line Input Voltage (RMS) | Vrms | 240 V |
| Non-Repetitive Surge Current (1/2 cycle) | ITSM | 300 A |
| Isolation Voltage (Base to Chip) | Visol | 2500 Vrms |
| Typical Unit Weight | — | 14.4 g (0.5 oz) |
3. Mechanical Dimensions & Universal Footprint
The L522F adopts the unified mechanical standard of the L Series, with a compact through-hole package:
- Overall length: 35.0 mm (1.38 in)
- Overall width: 28.4 mm (1.12 in)
- Overall height: 9.8 mm (0.39 in)
All L Series modules share an identical PCB footprint and pin layout. This means you can swap between different current/voltage ratings without modifying the board design, greatly simplifying BOM management and product scaling.
4. Circuit Diagram & Pinout
The L522F uses Circuit Type 2 full-wave rectifier topology, with a built-in free-wheeling diode across the DC output side. This configuration is especially suitable for inductive load scenarios (motor drives, relay power supplies) and suppresses back-EMF damage.
Pin function definition:
- AC1 / AC2: AC input terminals
- + / - : DC output terminals
- G1 / G2: Gate control terminals for thyristor triggering
5. Drop-In Compatible Replacement Models
Thanks to the unified L Series platform, the L522F is fully mechanically and electrically interchangeable with the following models (same circuit type, different specifications):
- Lower current: L321F, L322F (15A class)
- Different voltage: L521F (120V AC rating)
- Higher current: L621F, L622F (42.5A class)
- Non-F versions: L521, L522, L322, L622 (no free-wheeling diode)
This cross-compatibility is ideal for spare parts stocking, equipment maintenance, and design iteration across power levels.
6. Typical Application Scenarios
The L522F is widely deployed in systems requiring compact, reliable AC-to-DC rectification:
- Switch-mode power supplies (SMPS)
- Industrial battery chargers & UPS systems
- Motor soft-start control circuits
- Industrial automation power stages
- Medical equipment power supplies
- LED drivers & lighting ballasts
- Welding power equipment
7. Stock & Procurement Support
We keep 100% original brand new L522F modules in stock for immediate fulfillment:
- Original Crydom (Sensata) product, guaranteed authentic
- Ships within 24 hours after order confirmation
- Global shipping with competitive wholesale pricing
- Full official datasheet and formal quotation available on request
- Both sample orders and bulk volume orders accepted
Contact for Quotation
- WhatsApp: +86 13418787018
- Email: igbt@igbt-ic.com
We also supply a full range of high-voltage IGBT modules, matching driver boards, and other industrial power semiconductors.
