R-78B3.3-1.0L RECOM Power Power Supply (Other) In Stock
RECOM R-78B3.3-1.0L is a switching DC/DC regulator module outputting 3.3 V at 1.0 A from a 4.75 V to 32 V input, in a compact SIP-3 package as a pin-compatible replacement for 78xx linear regulators. Up to 96% efficient with no heat sink required. Available in stock with worldwide shipping.
- Manufacturer
- RECOM Power
- Package
- Other
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- R-78B3.3-1.0L Datasheet PDF
- Category
- Power Supply
- Temp Range
- -40.0°C to 71.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3.3 V / 1.0 A regulated output from a wide 4.75 V to 32 V input range covering 5 V, 12 V, and 24 V rails
- Up to 96% conversion efficiency eliminates the need for a heat sink, reducing BOM cost and board area
- SIP-3 pin-compatible footprint allows direct drop-in replacement of 7833 linear regulators with no PCB redesign
Applications
The R-78B3.3-1.0L is an efficient alternative to linear 78L33 or 7833 regulators in battery-powered IoT nodes, sensor boards, and industrial data-acquisition modules where thermal dissipation is a constraint. Its wide 4.75 V to 32 V input range makes it suitable for systems powered directly from 12 V or 24 V DC rails without a pre-regulator stage. The compact SIP-3 package enables single-sided PCB placement in space-constrained designs such as embedded controllers and wireless gateway modules.
Specifications
| Reach Compliance Code | Compliant |
| YTEOL | 6 |
| Analog IC - Other Type | DC-DC REGULATED POWER SUPPLY MODULE |
| Input Voltage-Max | 32V |
| Input Voltage-Min | 4.75V |
| Input Voltage-Nom | 24V |
| JESD-30 Code | R-PSMA-T3 |
| Load Regulation-Max | 0.6% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 3.399V |
| Output Voltage-Min | 3.201V |
| Output Voltage-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SMSIP3H,.75 |
| Package Shape | RECTANGULAR |
| Package Style | MICROELECTRONIC ASSEMBLY |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Technology | HYBRID |
| Temperature Grade | OTHER |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Total Power Output-Max | 3.3W |
| 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
Compatible alternatives and drop-in replacements for R-78B3.3-1.0L:
Frequently Asked Questions
How does R-78B3.3-1.0L efficiency compare with a traditional 7833 linear regulator at 24 V input?
A 7833 linear regulator at 24 V input dropping to 3.3 V at 1.0 A dissipates approximately 20.7 W as heat, giving only 13.75% efficiency. The R-78B3.3-1.0L achieves up to 96% efficiency, dissipating less than 0.14 W at the same operating point, which eliminates the heat sink and allows the component to operate cool even in sealed enclosures with no forced air.
Can R-78B3.3-1.0L operate from a single-cell lithium-ion battery pack through to a fully charged state?
A single-cell lithium-ion battery discharges from 4.2 V fully charged down to a cutoff of roughly 3.0 V. The R-78B3.3-1.0L requires a minimum input of 4.75 V, so it cannot maintain regulation across the full single-cell discharge range. However, a 2-cell series lithium pack (6.0 V to 8.4 V) is well within the 4.75 V to 32 V input window and can power the module at 1.0 A output for the entire usable capacity of the cells.
What load regulation specification does R-78B3.3-1.0L guarantee, and is it adequate for precision ADC supply rails?
The R-78B3.3-1.0L specifies a maximum load regulation of 0.6% from no load to full 1.0 A load, corresponding to a worst-case output variation of about 20 mV around the 3.3 V setpoint. For 12-bit ADC supply rails where a 1 LSB error equals roughly 0.8 mV, this variation may require an additional LC output filter or a low-dropout post-regulator, but it is fully adequate for most microcontroller and digital logic supply rails.
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