R-78B3.3-1.5 RECOM Power Power Supply (Other) In Stock
RECOM R-78B3.3-1.5 is a 3.3 V regulated DC-DC switching power module delivering 1.5 A output from a 4.75 V to 18 V input in a SIP-3 package. Replaces linear regulators with up to 97% efficiency and 0.8% load regulation. Available from authorized distributors with worldwide shipping.
- Manufacturer
- RECOM Power
- Package
- Other
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- R-78B3.3-1.5 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
- 3.3 V / 1.5 A regulated output with 4.75 V to 18 V wide input range for universal compatibility in mixed-voltage embedded systems
- Up to 97% conversion efficiency replaces lossy 7833 linear regulators, significantly reducing heat dissipation and enabling fanless designs
- SIP-3 pin-compatible footprint allows drop-in replacement of LDO regulators without PCB redesign
Applications
The R-78B3.3-1.5 is ideal for powering microcontrollers, sensors, and digital logic from unregulated or battery supplies in IoT gateways, industrial sensor nodes, and embedded computing systems. Its wide 4.75 V to 18 V input range accommodates 5 V, 9 V, and 12 V unregulated bus voltages commonly found in distributed power architectures. The high efficiency switching design eliminates the need for a heatsink and reduces PCB thermal management complexity compared to equivalent linear regulators.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 6 |
| Analog IC - Other Type | DC-DC REGULATED POWER SUPPLY MODULE |
| Input Voltage-Max | 18V |
| Input Voltage-Min | 4.75V |
| JESD-30 Code | R-XSMA-T3 |
| Load Regulation-Max | 0.8% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 1.5A |
| Output Voltage-Max | 3.366V |
| Output Voltage-Min | 3.234V |
| Output Voltage-Nom | 3.3V |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | SIP3,.08 |
| Package Shape | RECTANGULAR |
| Package Style | MICROELECTRONIC ASSEMBLY |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Technology | HYBRID |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Total Power Output-Max | 4.95W |
| 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 voltage range and output current does the R-78B3.3-1.5 support in a battery-powered design?
The R-78B3.3-1.5 accepts input voltages from 4.75 V to 18 V and delivers a regulated 3.3 V output at up to 1.5 A. This wide input range is ideal for battery-powered applications where bus voltage can vary from a fully charged 12 V lead-acid battery down to a nearly discharged 5 V lithium pack without losing output regulation.
How much more efficient is the R-78B3.3-1.5 compared to a 7833 linear regulator at 12 V input?
At 12 V input and 3.3 V / 1.5 A output, a 7833 linear regulator dissipates approximately 13 W as heat while achieving only 27.5% efficiency. The R-78B3.3-1.5 switching module operates at up to 97% efficiency under similar conditions, dissipating less than 0.5 W and eliminating the need for a heatsink in most industrial and embedded applications.
Can R-78B3.3-1.5 replace a three-terminal LDO such as the L7833 without changing the PCB layout?
Yes, the R-78B3.3-1.5 is housed in a SIP-3 package with the same three-pin through-hole footprint as standard 7833-series linear voltage regulators. Designers can swap the LDO for the RECOM switching module without PCB redesign, immediately gaining the efficiency and thermal benefits while maintaining the 3.3 V / 1.5 A output specification.
What load regulation performance does the R-78B3.3-1.5 achieve and why does it matter for sensor-heavy designs?
The R-78B3.3-1.5 specifies a maximum load regulation of 0.8%, meaning the 3.3 V output varies by at most 26.4 mV from no-load to full 1.5 A load. This tight regulation ensures ADC reference stability and sensor supply accuracy in data acquisition systems, preventing measurement errors that would arise from a poorly regulated supply rail under varying load transients.
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