PH9185.021NL

Overview

The PH9185.021NL is a surface-mount switch-mode power transformer from the EP7 platform, designed for isolated power supply drivers in push-pull converter topologies. It features reinforced insulation compliant with UL and TUV standards, offering 4000V RMS isolation voltage and an 8mm creepage distance. The component supports an operating temperature range of -40°C to +125°C and utilizes Class F insulation systems. Key electrical specifications include an inductance of 880 µH (±45%), a turns ratio of 3:4, and a maximum DCR of 0.56 Ω between pins 1 and 3. The physical dimensions are 10 mm x 10 mm x 13.8 mm.

Feature Summary

• Reinforced insulation providing high isolation for safety-critical applications
• Compatible with Maxim MAX253 driver ICs for RS-485/RS-232 transceivers
• Surface mount design with offset pins maintaining primary-secondary separation

Applications

• Powering RS-485 and RS-232 transceiver integrated circuits
• Industrial control system communication interfaces
• Building automation network nodes
• Smart grid monitoring equipment

Procurement Notes

Verify the specific suffix configuration against official Pulse Electronics documentation to ensure correct packaging and certification status. Confirm that the required UL/TUV certification level matches project safety requirements, as cost-reduced versions without these certifications may exist within the series. Cross-reference the exact inductance tolerance and DC resistance values with the latest datasheet before finalizing procurement specifications.

Selection Notes

Select this component when designing isolated power supplies for serial communication transceivers requiring high dielectric strength. Ensure the circuit topology supports fixed duty cycle push-pull operation. Verify that the 880 µH inductance and 3:4 turns ratio align with the target output voltage and current requirements of the connected IC. Check thermal management capabilities given the -40°C to +125°C operating range.

Part Context

This part belongs to the PH9185NL series of high-isolation power transformers manufactured by Pulse Electronics, a YAGEO Company. The series is engineered specifically for driving RS-485 and RS-232 transceivers, serving as a robust alternative to Ethernet solutions in industrial environments. The EP7 platform provides standardized mounting footprints while accommodating various turns ratios to suit different voltage levels up to 3W output.

Replacement Considerations

PH9185.011NL and PH9185.012NL are documented variants within the same EP7 platform series. Verify compatibility by comparing inductance values, turns ratios, and physical dimensions against the original design requirements before substitution.