Product Overview
Power Integrations SMP120 High-Voltage Off-line Switcher IC — 700V, TO-220, 100 kHz, AC-DC SMPS Replacement
Condition
Unused NOS — New Old Stock. Leads are clean with no solder or oxidation. Evaluation: Visual inspection only. Function testing not performed. Sourced from legacy electronics supply chain recovery. Covered by the PartsMine No Hassle Guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
Power Integrations SMP120 is an off-line switcher IC combining a high-voltage power transistor and control circuit in a single TO-220 package. Designed for the primary side of AC-DC switch-mode power supplies, it accepts rectified high-voltage DC input (from 110V or 220V AC mains) and switches at a typical frequency of 100 kHz. Maximum drain voltage is 700V. The SMP120 belongs to the SMP-series family (SMP120-SMP150); higher model numbers handle higher power levels. This part is long out of production — NOS stock is the primary route for direct replacement in legacy systems.
Key Features
- Drain voltage (max): 700V
- Switching frequency: 100 kHz (typical)
- Package: TO-220
- Pin count: Not confirmed — verify 3-lead or 5-lead requirement against your board before ordering
- Output power: Not confirmed — verify against datasheet before use
- Integrates power transistor and control circuit in one package
- Designed for the high-voltage (primary) side of AC-DC converters
- Requires heat sinking for proper thermal management
Applications
- Replacement in legacy AC-DC switch-mode power supplies (SMPS)
- Telecommunications equipment power converters from the 1990s era
- Small industrial power supplies using SMP-series architecture
- Legacy consumer electronics repair requiring direct SMP-series substitution
Frequently Asked Questions
Is this part compatible with modern TinySwitch or LinkSwitch ICs as a drop-in replacement?
No. The SMP-series uses a legacy architecture. Substituting a TinySwitch or LinkSwitch requires a complete PCB redesign. The SMP120 is a direct replacement only for boards originally designed for the SMP-series pinout, including the associated transformer and feedback loop.
How do I know if my board needs the 3-lead or 5-lead version?
Power Integrations produced SMP-series parts in multiple package configurations. Pin count is not confirmed for this specific unit — verify against your board schematic or the original component datasheet before ordering.
What does "Unused NOS" mean for a part this old?
New Old Stock means the component was never installed. Leads show no solder, flux, or oxidation — consistent with uninstalled parts. Visual inspection was performed and no issues were noted. Function testing was not performed.
Does this come with a datasheet or mounting hardware?
No datasheet or hardware is included. Datasheets for the SMP120 are available through Power Integrations archives and datasheet aggregator sites. Thermal interface material and mounting hardware must be sourced separately.
The SMP120 is a direct, architecturally specific replacement — confirm your board's SMP-series pinout and lead count before purchasing.
