The R-78E series is a switching regulator module that has been designed to offer all the advantages of a
switching regulator (high efficiency, wide input range, accurate output voltage regulation) but with a low
cost for production quantities. Due to the R-78E’s high efficiency of up to 91% at an output voltage of
5V/1A at the output, no heat sink is required. The compact TO- 220 compatible SIP3 package measures
only 11.6 x 8.5 x 10.4 mm, so it saves precious board space. The warranty is 3 years.
3
EAR
rranty
Selection Guide
Part
Number
R-78E3.3-1.0
R-78E5.0-1.0
Input
Voltage Range
[VDC]
7 - 28
8 - 28
Output
Voltage
[VDC]
3.3
5.0
Output
Current
[mA]
1000
1000
Efficiency
typ @ min Vin.
[%]
87
91
Max. Capacitive
Load
[µF]
220
220
Specifications
(measured at ta= 25°C, full load, nominal input voltage and after warm-up)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Input Current
No Load Input Current
Operating Frequency
Output Ripple and Noise
Condition
3.3V
5.0V
min. Vin
typ. Vin
Vin= 12VDC
typ. Vin, full load and 20MHz BW limited
Min.
7VDC
8VDC
1.5mA
Typ.
24VDC
Max.
28VDC
1000mA
1.5mA
330kHz
120mVp-p
IEC60950-1 certified
EN60950-1 certified
Efficiency vs. Load
R-78E3.3-1.0
100
95
100
95
R-78E5.0-1.0
Efficiency [%]
90
Efficiency [%]
90
85
80
75
70
85
80
75
7V
12V
24V
28V
0
0.2
0.4
0.6
0.8
1.0
8V
12V
24V
28V
0
0.2
0.4
0.6
0.8
1.0
Output Current [A]
Output Current [A]
www.recom-power.com
REV.: 4/2017
I-1
R-78E-1.0
DC/DC Converter
Specifications
(measured at ta= 25°C, full load, nominal input voltage and after warm-up)
REGULATIONS
Parameter
Output Voltage Accuracy
Line Voltage Regulation
Load Voltage Regulation
low line to high line, full load
typ Vin. and 10% to 100% load
Series
Condition
Value
±3% typ. / ±5% max.
±1% max.
±1.5% max.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Over Current Protection (OCP)
100% = 1A
Condition
Value
automatic recovery
200% Load
ENVIRONMENTAL
Parameter
Operating Temperature Range
Humidity
MTBF
Condition
natural convection and with derating (see graph)
non-condensing
MIL-HDBK 217F, +25°C
100
80
60
40
20
0
-40
Value
-40°C to +85°C
95%, RH max.
3875 x 10
3
hours
Derating Graph
Output Power [%]
0
20
40
60
Ambient Temperature [°C]
80
85
100
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety (LVD)
Report / File Number
LVD1603123
Standard
IEC/EN60950-1, 2nd Edition, Am2:2013
EMC Compliance
Information technology equipment - Radio disturbance characteristics - Limits and
methods of measurement
Condition
with external filter
Standard / Criterion
EN55022, Class A or B
EMI Filter suggestion Class A and B
+V
IN
L1
R-78Exx-1.0
C1
C2
+V
OUT
GND
GND
MODEL
Class A
Class B
I-2
C1/C2
1210 10µF, 50V MLCC
REV.: 4/2017
L1
10µH
33µH
www.recom-power.com
R-78E-1.0
DC/DC Converter
Specifications
(measured at ta= 25°C, full load, nominal input voltage and after warm-up)
DIMENSION and PHYSICAL CHARACTERISTICS
Parameter
Case Material
Potting Material
Package Dimension (LxWxH)
Package Weight
Series
Value
UL94V-0, non-conductive black plastic
UL94V-0, Silicone
11.6 x 8.5 x 10.4mm
2g typ.
Dimension Drawing (mm)
embossed logo
11.6
R-78Exx-1.0
0.51
8.5
R-78Exx-1.0
10.4
Marking
xxxx
xxxx
0.7
3.21
5.08
4.10
0.25
Ø1.0 +0.15/-0
Top View
1 2 3
Pin Connections
Pin # Function
1
+Vin
2
GND
3
+Vout
Tolerance: xx.x= ±0.50mm
xx.xx= ±0.25mm
Bottom View
INSTALLATION AND APPLICATION
Standard Application:
+V
IN
2.54
2.54
2.0
R-78Exx-1.0
10µF MLCC
(optional)
+V
OUT
C1
10µF MLCC
(optional)
C2
GND
GND
To protect the converter during power-up, use soft start power supply.
Notes:
Note1: The R-78Exx-1.0 can`t be used as positive to negativ converter.
PACKAGING INFORMATION
Parameter
Packaging Dimension (LxWxH)
Packaging Quantity
Storage Temperature Range
Type
Tube
Value
520 x 18.2 x 11.2mm
42pcs.
-55°C to +125°C
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.
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