RI3-0509S RECOM Power Power Supply (Other) In Stock
The RI3-0509S is an unregulated DC-DC power module from RECOM with a 5 V nominal input, 9 V output, 3 W power rating, and a 4-pin SMA package providing isolated conversion for industrial and embedded system power supply designs.
- Manufacturer
- RECOM Power
- Package
- Other
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- RI3-0509S Datasheet PDF
- Category
- Power Supply
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3 W unregulated DC-DC conversion from 5 V input to 9 V output enabling rail step-up in isolated subsystems
- 4.5 V to 5.5 V wide input range accommodating USB-derived and regulated 5 V bus variations
- SMA 4-pin package for through-hole mounting providing mechanical stability in vibration-prone industrial environments
- Up to 10% load regulation with internal isolation barrier for safe cross-domain signal and power routing
- RoHS-compliant construction supporting global environmental compliance requirements
Applications
The RI3-0509S is used in industrial field instruments, PLC analog output cards, and RS-485 or CAN bus transceivers that need a locally isolated 9 V rail derived from a 5 V system bus. Its 3 W output capacity is sufficient to power op-amp stages, isolated gate drivers, and sensor excitation circuits without additional boost converters. Embedded systems and test equipment designers also select this module to generate auxiliary supply voltages where PCB space permits a 4-pin SMA through-hole footprint.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 6.2 |
| Analog IC - Other Type | DC-DC UNREGULATED POWER SUPPLY MODULE |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 5V |
| JESD-30 Code | R-PSMA-P4 |
| Load Regulation-Max | 10% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Voltage-Max | 9.27V |
| Output Voltage-Min | 8.73V |
| Output Voltage-Nom | 9V |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | MICROELECTRONIC ASSEMBLY |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Surface Mount | NO |
| Technology | HYBRID |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | PIN/PEG |
| Terminal Pitch | 2.54mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Total Power Output-Max | 2.997W |
| Trim/Adjustable Output | NO |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| Country of Origin | Mainland China, Taiwan |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input and output voltage specifications define the RI3-0509S, and what is its maximum output power?
The RI3-0509S accepts a 4.5 V to 5.5 V input with a 5 V nominal and delivers a 9 V unregulated output at up to 3 W continuous power. At full load, the output current is approximately 333 mA (3 W ÷ 9 V), and load regulation is rated up to 10%, meaning the output may sag slightly under heavy loads without external regulation.
How does the load regulation of the RI3-0509S affect circuit design, and when should a post-regulator be added?
With a maximum load regulation of 10%, the 9 V output of the RI3-0509S can vary by up to 0.9 V between no-load and full-load conditions. For analog circuits requiring a stable 9 V reference—such as precision op-amp supplies or ADC reference inputs—a downstream linear regulator (e.g. an LDO set to 8 V) should be added to maintain output accuracy within ±1% regardless of load current changes.
What isolation barrier does the RI3-0509S provide, and is it suitable for RS-485 transceiver power supplies?
The RI3-0509S provides galvanic isolation between the 5 V input and 9 V output, with an isolation voltage typically rated at 1 kV DC. This makes it well-suited to power isolated RS-485 or CAN transceivers where the communication ground must float independently from the system ground, protecting the main 5 V bus from ground-loop currents and surge voltages up to 1 kV.
Can the RI3-0509S be used directly on a USB 5 V power rail in a portable instrument?
Yes, the RI3-0509S operates from 4.5 V to 5.5 V, fully covering the USB VBUS range of 4.75 V to 5.25 V. Delivering up to 3 W from a USB port is feasible when the host provides at least 600 mA on the 5 V rail (USB 2.0 high-power ports supply 500 mA, while USB 3.0 and USB-C supply 900 mA or more), making this module practical for field-powered test equipment.
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