Amada Miyachi / Unitek Miyachi Unibond II Power Supply

The Amada Miyachi Unitek Miyachi Unibond II Power Supply (Model UB2) is a dual-mode constant power/constant voltage supply engineered for precision resistance welding in microelectronics assembly. The unit employs microprocessor control and a capacitor bank current source to deliver repeatable pulse welding with remote voltage sensing. Pulse amplitude adjusts continuously from 0.01 to 3.99 volts in 0.01-volt increments, while pulse duration is selectable via digital thumbwheel switches. Two feedback modes address different process requirements: Voltage Feedback Mode for direct control, and Voltage + Current Feedback Mode, which dynamically maintains constant power by adjusting pulse amplitude across weld resistances from 1 to 15 milliohms. The exclusive remote voltage sensing topology minimizes lead inductance effects, critical for fine-wire and ribbon bonding on microwave, flatpack, and thin-film/thick-film substrates. Compatible with Unitek parallel-gap weld heads (Models 40, 46, 86, 87, 127, 147), the supply works with Unibond and Unitip electrodes. Load resistance between output transformer terminals and welding load must not exceed 1.5 milliohms.

– Technical Specifications

• Model: UB2 (Stock No. 1-191-01)
• Power Modes: Dual Mode (Constant Power / Constant Voltage)
• Control: Microprocessor control for repeatable process control
• Pulse Amplitude: 0.01 to 3.99 volts, continuously adjustable in 0.01-volt increments
• Pulse Duration: Selectable via digital thumbwheel switches
• Weld Resistance Compensation: 1 to 15 milliohms, continuously adjustable
• Current Source: Capacitor bank (low impedance)
• Voltage Sensing: Remote voltage sensing (exclusive feature)
• Power Requirements: 100, 115, 208, or 230 volts ±13%
• Compatible Weld Heads: Unitek Models 40, 46, 86, 87, 127, 147 (1.5 milliohms or less)
• Load Resistance Limit: Maximum 1.5 milliohms (output transformer terminals to welding load)

– Key Features

• Voltage Feedback Mode and Voltage + Current Feedback Mode for dynamic constant-power control
• Solid-state capacitor bank design replaces battery-powered systems
• Microprocessor control ensures repeatable welding parameters
• Optional Meter Accessory (Model UBM, Stock No. 10-266-01) for weld load resistance determination

– Typical Applications

• Terminating fine wire on microelectronic components
• Bonding ribbons to microwave devices
• Joining flatpack leads to printed circuit boards
• Bonding fine wire or ribbon to thin-film and thick-film substrates

– Compatibility & Integration

• Works with Unibond electrodes for parallel-gap bonding and reflow soldering
• Supports Unitip electrodes for parallel-gap bonding of gold-plated kovar, copper, or gold ribbons smaller than 0.010 inches
• Integrates with Unitek parallel-gap weld head family