Lambda / TDK / EMI LWT50H-522

The TDK-Lambda LWT50H-522 is an obsolete enclosed AC-DC power supply engineered for industrial applications requiring multi-output DC rails in a compact form factor. This 50 W unit accepts both AC and DC inputs across wide voltage ranges, delivering regulated outputs at +5 V, +12 V, and −12 V with convection cooling and passive thermal management. Field-proven in legacy systems, it remains available through final inventory channels with recommended migration to the CUT75-522 platform.

Technical Specifications

• AC input: 85–265 VAC, 47–440 Hz


• DC input: 110–330 VDC


• Inrush current: 16 A / 32 A (at 110 VAC / 200 VAC)


• Hold-up time: 20 ms (typical at 100 VAC)


• Typical efficiency: 72% Output Configuration


• Triple output: +5 V (8 A max), +12 V (1 A max), −12 V (1 A max)


• Total rated power: 50 W maximum


• Output voltage accuracy: ±5% across all rails


• Line regulation: 1%; load regulation: 2%


• Ripple and noise: 100 mV (+5 V), 150 mV (±12 V outputs)


• Overcurrent protection: >105%; overvoltage protection: 5.75–6.75 V (manual reset, all outputs disabled on trip) Thermal and Environmental


• Operating temperature: 0–60 °C with derating (100% at 40 °C, 80% at 50 °C, 60% at 60 °C)


• Storage range: −30 to +85 °C


• Operating humidity: 30–90% RH (non-condensing); storage: 10–95% RH


• Cooling method: Convection (passive)


• Dimensions: 97 mm W × 26 mm H × 160 mm D (approximately 3.82 × 1.02 × 6.30 inches)


• Weight: 400 g typical

Key Features

• Wide AC/DC input acceptance (85–265 VAC or 110–330 VDC)


• Compact enclosed package suitable for OEM integration


• Independent protection on main +5 V output with manual-reset overvoltage detection


• Temperature coefficient: <1% on +5 V, <2% on ±12 V rails (0–60 °C)


• CSA, EN, and UL certified to IEC 60950-1 and 62368-1 standards


• RoHS compliant; VDE and FCC Class B EMI classification

Typical Applications Legacy industrial control systems, embedded computing platforms, and instrumentation requiring multi-voltage supplies with moderate current budgets and long operational history.

Compatibility & Integration Single-phase AC or DC input connectivity. External EMC filtering recommended; manufacturer datasheet specifies compatible filter selections. Product status: obsolete as of June 2025; CUT75-522 identified as migration target.