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R-78AA3.3-0.5SMD-R
Non Isolated POL DC/DC Converter, ITE, ITE, Surface Mount DIP, 1 Output, 1.65 W, 3.3 V, 500 mA
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: RECOM POWER
- Product type: DC / DC Non Isolated Board Mount Converters - Fixed Output
- SVHC: No SVHC (21-Jan-2025)
- Depth: 9.4mm
- Width: 15.3mm
- Height: 8.8mm
- Product Range: R-78AA-0.5 Series
- No. of Outputs: 1 Output
- Output Power Max: 1.65W
- Output Current Max: 500mA
- Output Voltage Nom: 3.3V
- Input Voltage DC Max: 32V
- Input Voltage DC Min: 4.75V
- DC / DC Converter Type: Surface Mount DIP
- Power Supply Applications: ITE
- DC / DC Converter Mounting: Surface Mount Device
- DC / DC Converter Output Type: Fixed, Adjustable
| Delivery and price | |
|---|---|
| Units per pack | 250 |
| Price | 8.68 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
## • Efficiency up to 95%, no need for heatsinks Features • High reflow temperature SMD package Cc • Adjustable output voltage buck converter **DC/DC Converter** • Wide input range (4.74V - 32V) Switching • Short circuit protection, thermal shutdown • Remote on/off control Regulator • Very low shutdown current **R-78AA-0.5** • Positive to negative converter ee Dn ## Description The R-78AAxx-0.5SMD series are adjustable output non-isolated buck converters that meet the requirements for RoHS 10/10 as well as the reflow soldering temperatures associated with vapor phase soldering, making these high efficiency switching regulators ideally suited to modern pick-and-place mass production. The efficiency of up to 97% means that very little energy is wasted as heat. The additional features of remote on/off control, continuous short circuit protection and adjustable output voltages will find many uses in the battery-powered, industrial, medical and automotive markets. ## **0.5 Amp SMD Single Output** ## Selection Guide **==> picture [365 x 184] intentionally omitted <==** **----- Start of picture text -----**<br> Part Input Output Vout Output Efficiency<br>Number Voltage Range Voltage Adjust Range Current @ min Vin @ max. Vin<br>[VDC] [ (1)] [VDC] [VDC] [A] [%] [%]<br>AN R-78AA1.5-0.5SMD 4.75 - 30 1.5 fixed 0.5 _§ 73 63<br>R-78AA1.8-0.5SMD 4.75 - 32 1.8 1.5 - 3.0 0.5 82 71<br>R-78AA2.5-0.5SMD 4.75 - 32 2.5 1.5 - 3.0 0.5 87 77<br>R-78AA3.3-0.5SMD 4.75 - 32 3.3 3.0 - 5.5 0.5 91 81<br>R-78AA5.0-0.5SMD 6.5 - 32 5.0 3.0 - 8.0 0.5 94 86<br>R-78AA6.5-0.5SMD 8.0 - 32 6.5 3.3 - 11.0 0.5 95 88<br>R-78AA9.0-0.5SMD 11 - 32 9.0 4.5 - 12.6 0.5 96 92<br>R-78AA12-0.5SMD 15 - 32 12 4.5 - 12.6 0.5 97 94<br>TTT<br>R-78AA15-0.5SMD 18 - 32 15 fixed 0.5 97 95<br>ce Notes:<br>Note1: Input voltage ranges valid for nominal output voltages<br>Vin must be higher than Vout including adjust range and dropout voltage<br>**----- End of picture text -----**<br> EN60950-1 certified IEC60950-1 certified ## Model Numbering ~~LC~~ ## R-78AA__-0.5 SMD-_ nom. Output Voltage Packaging[ (2)] Output Current Package Notes: Note2: add suffix -R for tape & reel packaging ## Ordering Examples: R-78AA5.0-0.5SMD-R = 5.0VDC Output Voltage, 0.5A, SMD, tape and reel packaging R-78AA2.5-0.5SMD = 2.5VDC Output Voltage, 0.5A, SMD, tube REV.: 5/2019 I-1 **www.recom-power.com** **Series** ## **R-78AA-0.5** ## **DC/DC Converter** Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated) BASIC CHARACTERISTICS ~~a DO~~ Parameter Condition Min. Typ. Max. Absolute Maximum Input Voltage 34VDC ~~DR~~ Quiescent Current Vin= min. to max. 5mA 7mA ~~DR~~ Internal Power Dissipation 0.4W ~~DR~~ Output Voltage Adjustability see calculation ~~a~~ Minimum Load[(3)] 0% ~~DR~~ Start-up time ON/OFF CTRL 50ms ~~DR~~ DC-DC ON Open or 2.8VDC<Vr<5VDC ON/OFF CTRL DC-DC OFF GND or 0VDC<Vr<0.8VDC ~~a~~ Input Current of CTRL Pin DC-DC OFF 1.8µA Standby Current 20µA 30µA ~~De OC~~ CTRL Thereshold Voltage 2.4VDC 2.6VDC 2.8VDC ~~DR GC~~ CTRL Voltage Hysterese 250mV ~~DR DO~~ Internal Operating Frequency 280kHz 330kHz 380kHz 1.5VDC tp 6.5VDC 20mVp-p 30mVp-p ~~a~~ Output Ripple and Noise 20MHz BW 9VDC to 15VDC 30mVp-p 40mVp-p with normal start-up time, no external components 470µF Maximum Capacitive Load with <1 second start-up time + diode protection circuit 6800µF ~~Re~~ Notes: Note3: Operation under no load will not harm the converter, but specifications may not be met. A minimum load of 6mA is recommended ## Output Voltage Adjustability ## Adjustment Resistor Values |V0|R1|R2|R3||Vref(V)|Vref(V)|||||||||||||| |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| |1.8V<br>2.5V<br>3.3V|10kΩ<br>22kΩ<br>16.9kΩ|21kΩ<br>21kΩ<br>10kΩ|5.6kΩ<br>5.6kΩ<br>5.6kΩ||1.23<br>1.23<br>1.23|||||||Rdown =||||R2(R1 + R3) x (Vref - Vo) + Vref x R1R3<br>R2Vo - Vref (R1 + R2)|||| |5.0V|30.9kΩ|10kΩ|10kΩ||1.23||||||||||||||| |6.5V|43kΩ|10kΩ|10kΩ||1.23||||||||||||||| |9V<br>12V|63.4kΩ<br>88.7kΩ|10kΩ<br>10kΩ|22.1kΩ<br>22.1kΩ||1.23<br>1.23||||||||Rup =|||R2R3 (Vref - Vo) + Vref R1 (R2 + R3)<br>R2 (Vo - Vref) - Vref R1|||| ||||+Vin|||||||||||||+Vout|||| ||||||||||||||||||||| ||||||||||||R1||||||||Rdown| ||||GND<br>Controlled IC<br>eereee||||||||R2||R3|||GND<br>Vadj<br>Oe:|||Rup| |||||||||||||||||Vref|||| continued on next page REV.: 5/2019 I-2 **www.recom-power.com** **Series** ## **R-78AA-0.5** ## **DC/DC Converter** Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated) **==> picture [471 x 675] intentionally omitted <==** **----- Start of picture text -----**<br> Efficiency vs. Vin (full load) Ripple vs. Vin (full load)<br>100 50<br>H}——} |__|} + | 15Vout po<br>90 55 12Vout<br>9Vout<br>80 40 5Vout<br>3.3Vout<br>70 45<br>1.8Vout<br>60 a 30 i 1.5Vout | |eeLa<br>50 25<br>40 15, 12Vout 20<br>9Vout<br>30 15<br>5Vout<br>20 i 3.3Vout a 10 1 =F a a<br>1.8Vout<br>10 5<br>i 1.5Vout a OS eecc<br>= EEE i ee eee<br>0 0<br>4.75 10 15 20 25 30 34 4.75 10 15 20 25 30 34<br>Input Voltage [VDC] Input Voltage [VDC]<br>Efficiency vs. Load (max. Vin) Ripple vs. Load (max. Vin)<br>100 a 50 15Vout eeee<br>90 ermee et et 45 12Vout | | | | ee| ee<br>9Vout<br>80 468322 Sm 40 5Vout | | ft | ft<br>3.3Vout<br>70 35<br>Eee cae ee | | ft | |<br>1.8Vout<br>60 eee 30 1.5Vout | | ft | ft<br>50 . 25 CL<br>40 15Vout 20<br>12Vout<br>30 15<br>5Vout<br>20 3.3Vout 10<br>1.8Vout<br>10 5<br>1.5Vout<br>EEE tchcbebectacfeatet<br>0 0<br>0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100<br>Output Load [%] Output Load [%]<br>Efficiency vs. Load (min. Vin) Ripple vs. Load (min. Vin)<br>a a<br>100 25 15Vout<br>12Vout<br>90<br>5Vout<br>80 [ 20 3.3, 9Vout Py | ||<br>1.8Vout<br>70<br>1.5Vout<br>60 15<br>P| | tT EE ee<br>50<br>40 eeepc 10 LEED tere<br>30 15,12Vout<br>5Vout<br>20 3.3Vout 5<br>1.8Vout<br>10<br>1.5Vout<br>0 0<br>0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100<br>Output Load [%] Output Load [%]<br>Efficiency [%] Efficiency [%]<br>Efficiency [%] Ripple [mV]<br>Efficiency [%]<br>Ripple [mV]<br>**----- End of picture text -----**<br> REV.: 5/2019 I-3 **www.recom-power.com** **R-78AA-0.5 Series** **DC/DC Converter** ~~LT~~ Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated) REGULATIONS Parameter Condition Value Output Accuracy full load ±2.0% typ. / ±3.0% max. low line to high line 1.5 VDC tp 6.5VDC ±0.2% typ. / ±0.4% max. Line Regulation at full load 9VDC to 15VDC ±0.1% typ. / ±0.2% max. 1.5 VDC tp 6.5VDC ±0.7% typ. / ±1.0% max. Load Regulation 10% to 100% load 9VDC to 15VDC ±0.25% typ. / ±0.4% max. with a 100µF output 100% <-> 50% load ±85mV typ. / ±100mV max. Transient Response capacitor 100% <-> 10% load ±100mV typ. PROTECTIONS Parameter Condition Value ~~a a~~ Short Circuit Protection (SCP) continuous, automatic recovery ~~a~~ Short Circuit Input Current nom. Vin= 24VDC 60mA typ. / 100mA max. Optional Diode Protection Circuit Optional Protection 1: Optional Protection 2: Add a blocking diode to Vout if current can flow backwards into the output, as this can damage the converter when it is powered down. +Vin +Vin R-78AAxx-0.5SMD +Vout +Vout +Vin +Vin CTRLR-78AAxx-0.5SMDGND Vadj +Vout +Vout The diode can either be fitted CTRL GND Output Voltage Adjustability across the device if the source is CTRL CTRL up 1 diode drop low impedance or fitted in series GND GND GND GND with the output (recommended). ~~ee~~ ENVIRONMENTAL ~~Cn~~ Parameter Condition Value ~~a ee~~ Operating Temperature Range with derating (see graph) -40°C to +85°C ~~a~~ Maximum Case Temperature +100°C ~~a~~ Temperature Coefficient ±0.015%/°C ~~a~~ Thermal Impedance 0.1m/s, horizontal 70°C/W ~~ee~~ Operating Altitude 2000m ~~ee~~ Operating Humidity non-condensing 5% - 95% RH max. ~~ee~~ Pollution Degree PD2 +25°C 21098 - 29253 x 10[3] hours MTBF according to MIL-HDBK-217F, G.B. ~~a es ee~~ + 71°C 4214 - 7365 x 10[3] hours Derating Graph 100 90 ~~SeGeS0RR0 en~~ 80 ~~Peer~~ 70 PEPER ~~EEE~~ 60 ~~Peer eee~~ 50 ~~PEPER Err~~ 40 ~~SeSSe000R0810~~ 30 SeSSe000R005i10 20 ~~SERRE~~ 10 SeGSe00RR005i10 SeSS0008005110 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 71 85 Ambient Temperature [°C] REV.: 5/2019 I-4 **www.recom-power.com** ## **R-78AA-0.5** ## **DC/DC Converter** ## **Series** Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated) |**DC/DC Converter**<br>Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)|Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)|**Series**| |---|---|---| |SAFETY AND CERTIFICATIONS||| |Certificate Type(Safety)|Report / File Number|Standard| |Information Technology Equipment, General Requirements for Safety|1603123|IEC60950-1:2005, 2nd Edition + AM 2:2013<br>EN60950-1:2006 + AM 2:2013| |EAC|RU-AT.49.09571|TP TC 004/2011| |RoHS 2+||RoHS 2011/65/EU + AM2015/863| |||| |EMC Compliance|Condition|Standard / Criterion| |Electromagnetic compatibility of multimedia equipment -<br>Emission requirements|with external filter<br>(see filter suggestion below)|EN55032, Class A and B| |ESD Electrostatic discharge immunitytest|Air ±8kV; Contact ±4kV|EN61000-4-2| |Radiated, radio-frequency, electromagnetic field immunitytest|3V/m|EN61000-4-3| EMC Filter Suggestion according to EN55032 L 1 R-78AAxx-0.5 +Vin +Vin +Vout +Vout GND C1 C2 GND ~~i~~ GND Component List Class A Component List Class B MODEL C1 L1 MODEL C1 C2 L1 R-78AA5.0-0.5SMD R-78AA5.0-0.5SMD 10µF 3.9µH choke 10µF 10µF 5.6µH choke R-78AA12-0.5SMD R-78AA12-0.5SMD 100V MLCC RLS-397 100V MLCC 100V MLCC RLS-567 R-78AA15-0.5SMD R-78AA15-0.5SMD ~~=o Eee~~ Notes: Note4: Filter suggestions are valid for indicated part numbers only. For other part numbers, please contact RECOM tech support for advice |DIMENSION AND PHYSICAL CHARACTERISTICS|DIMENSION AND PHYSICAL CHARACTERISTICS|DIMENSION AND PHYSICAL CHARACTERISTICS| |---|---|---| |Parameter|Type|Value| |Material|case<br>PCB|non-conductive black plastic, (UL94 V-2)<br>FR4, (UL94 V-1)| |Dimension(LxWxH)||15.3 x 9.6 x 8.8mm| |Weight||2.7gtyp.| |continued on nextpage||| continued on next page REV.: 5/2019 I-5 **www.recom-power.com** ## **R-78AA-0.5** ## **DC/DC Converter** ## **Series** Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated) **==> picture [454 x 274] intentionally omitted <==** **----- Start of picture text -----**<br> Dimension Drawing (mm) 15.3<br>Pinning information<br>tl<br>Pin # Single<br>15.0 9.4 1,2 +Vin<br>3,7,8,9 GND<br>4,5 +Vout<br>6 Vadj<br>10 CTRL<br>0.50 [±0.05]<br>eon im Tolerance:<br>xx.x= 0.5mm<br>2.54 x 4 Recommended Footprint Details xx.xx= ±0.25mm<br>10 9 8 7 6<br>1 2 3 4 5<br>Bottom View Top View<br>10 9 8 7 6<br>1 2 3 4 5<br>2.54 1.30 1.20<br>9.6<br>8.8 9.24<br>12.35 13.00<br>1.80<br>**----- End of picture text -----**<br> ## INSTALLATION AND APPLICATION ## Standard Application Circuit **==> picture [238 x 119] intentionally omitted <==** **----- Start of picture text -----**<br> +Vin +Vin R-78AAxx-0.5SMD +Vout +Vout<br>10µFC1 CTRL GND Vadj Rdown C2100µF<br>(optional) (optional)<br>CTRL<br>R<br>up<br>GND GND<br>To protect the converter from high inrush currents, use soft start Vin and C1 = 10µF<br>Output capacitor C2 recommended if load is very dynamic<br>**----- End of picture text -----**<br> ## Positive to Negative Converter **==> picture [357 x 113] intentionally omitted <==** **----- Start of picture text -----**<br> GND GND<br>+Vin +Vin R-78AAxx-0.5SMD GND C1 and C2 are required and should<br>C1 CTRL -Vout -Vadj Rdown be fitted close to the converter pins.<br>C2 Maximum capacitiv load including<br>On/Off R C2 is 220µF<br>(reference to -Vout) up<br>-Vout<br>**----- End of picture text -----**<br> ||Pin Connections|Pin Connections|Pin Connections|Pin Connections|Pin Connections|Pin Connections||||| |---|---|---|---|---|---|---|---|---|---|---| ||Pin #<br>1,2||Pin #<br>Negative<br>+Vin|||||Negative<br>Positive<br>+Vin||| |4,5<br>6<br>10|3,7,8,9<br>4,5<br>6<br>10|||-Vout<br>GND<br>-Vadj<br>CTRL||||GND<br>+Vout<br>+Vadj<br>CTRL||| |||||||||||| ||||10||9|8|7|6||| |||||Top View|||||13.00|| ||||1|2||3|4|5||| |||||||||||| ||1.80|||||||1.20||| continued on next page REV.: 5/2019 I-6 **www.recom-power.com** **R-78AA-0.5 Series** **DC/DC Converter** ~~|~~ Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated) ## Selection Guide - Negative Output |Part|Input|Output|Output<br>Output|Efficiency|Efficiency|External Capacitor|External Capacitor| |---|---|---|---|---|---|---|---| |Number|Voltage Range|Voltage|Voltage<br>Current|@ min Vin|@ max. Vin|C1|C2 (5)| ||[VDC]|[VDC]|[A]|[%]|[%]||| |R-78AA1.5-0.5SMD|4.75 - 28|-1.5|-0.4|68|67|10µF/35V|22µF/6.3V| |R-78AA1.8-0.5SMD|4.75 - 28|-1.8|-0.4|71|70|10µF/50V|22µF/6.3V| |R-78AA2.5-0.5SMD|4.75 - 28|-2.5|-0.4|75|76|10µF/50V|22µF/6.3V| |R-78AA3.3-0.5SMD|4.75 - 28|-3.3|-0.4|77|80|10µF/50V|22µF/6.3V| |R-78AA5.0-0.5SMD|4.75 - 28|-5.0|-0.4|79|84|10µF/50V|22µF/10V| |R-78AA6.5-0.5SMD|5.0 - 26|-6.5|-0.3|81|86|10µF/50V|10µF/10V| |R-78AA9.0-0.5SMD|8.0 - 18|-9.0|-0.2|87|89|10µF/50V|10µF/16V| |R-78AA12-0.5SMD|8.0 - 18|-12|-0.2|87|90|10µF/50V|10µF/25V| |R-78AA15-0.5SMD|8.0 - 18|-15|-0.2|87|91|10µF/50V|10µF/25V| |||Notes:|||||| |||Note5: Maximum Capacitive Load including C2 is 220µF|Note5: Maximum Capacitive Load including C2 is 220µF||||| |PACKAGING INFORMATION|PACKAGING INFORMATION|PACKAGING INFORMATION| |---|---|---| |Parameter|Type|Value| |Packaging Dimension (LxWxH)|tube<br>tape and reel(carton)|530.0 x 17.0 x 13.0mm<br>355.0 x 342.0 x 36.0mm| |Packaging Quantity|tube<br>tape and reel|33pcs<br>250pcs| |Tape Width||24mm| |Storage Temperature Range||-55°C to +125°C| |Storage Humidity||95% RH max.| The product information and specifications may be subject to changes even without prior written notice.The product has been designed for various applications; its suitability lies in the responsibility of each customer. The products are not authorized for use in safety-critical applications without RECOM’s explicit written consent. A safety-critical application is an application where a failure may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The applicant shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications. REV.: 5/2019 I-7 **www.recom-power.com**
Updated at April 23, 2026
RECOM Power is a globally recognized manufacturer specializing in standard and customized power conversion solutions. Headquartered in Austria with state-of-the-art research and development facilities, the company has built a strong reputation for innovation and reliability. Operating from ISO 9001 and IATF 16949 certified manufacturing sites, RECOM delivers premium power supplies engineered for demanding applications across IoT, Industry 4.0, medical technology, and transportation. The core of our RECOM Power portfolio is dedicated to advanced power and line protection, featuring an extensive selection of high-performance AC/DC converters. These modules are designed to provide efficient, stable power distribution for a wide array of industrial and commercial electronics. In addition to general-purpose power supplies, we offer a robust range of AC/DC LED power supplies specifically optimized to meet the stringent efficiency and lifespan requirements of modern lighting systems. To support comprehensive power architecture design, our selection also includes highly efficient DC/DC converters ideal for precise voltage regulation in complex circuits. Furthermore, we provide specialized passive components such as RECOM power inductors, ensuring engineers have access to the critical, high-quality components required to develop resilient and optimized power delivery systems.
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