
www.recom-power.com REV.: 0/2023 I-1
R-78K-0.5
DC/DC Converter
0.5 Amp
SIP3
Single Output
Description
The R-78K-0.5 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-78K-0.5’s high efficiency of up to 96%, no heat-sink
is required, and full load operation from -40 to 90°C is possible. The compact TO-220 compatible SIP3
package measures only 11.5 x 7.55 x 10.2mm, so it saves precious board space.
ABSOLUTE MAX RATINGS (exceeding these ratings may damage the device)
Parameter Condition Min. Typ. Max.
Maximum Input Voltage Slew Rate
(1)
+V
IN
to GND 10VDC/µs
Case Temperature
-40°C 115°C
Storage Temperature
-50°C 125°C
Features
Switching
Regulator
• Efficiency up to 96%, no need for heatsinks
• 4.5 - 36VDC wide input voltage
• -40°C to +90°C ambient operation without
derating
• Pin compatible with 78 series regulators
• Non isolated DC/DC converter
• Undervoltage and short circuit protection
R
E
C
O
M
C
O
N
V
E
R
T
E
R
S
C
O
M
P
L
I
A
N
T
P
R
O
D
U
C
T
S
RoHS
2
+
compliant
10 from 10
R
E
C
O
M
C
O
N
V
E
R
T
E
R
S
C
O
M
P
L
I
A
N
T
P
R
O
D
U
C
T
S
REACH
compliant
IEC/EN62368-1 3rd Edition certified
EN55032 compliant
Notes:
Note1: At higher slew rates or hard plugging, add 27µF E-Cap between +Vin and GND,
especially when Vin is >18VDC
Model Numbering
Specifications
Output Current
Output Voltage
R-78K -
Selection Guide
Part
Number
Input
Voltage Range
[VDC]
Output
Voltage
[VDC]
Output
Current
[mA]
Efficiency
@ min. Vin
[%]
@ max. Vin
[%]
R-78K1.5-0.5 4.5 - 36 1.5 500 83 66
R-78K1.8-0.5 4.5 - 36 1.8 500 85 70
R-78K2.5-0.5 4.5 - 36 2.5 500 87 75
R-78K3.3-0.5 4.5 - 36 3.3 500 89 80
R-78K5.0-0.5 6.5 - 36 5 500 92 85
R-78K6.5-0.5 8 - 36 6.5 500 93 86
R-78K9.0-0.5 12 - 36 9 500 94 89
R-78K12-0.5 15 - 36 12 500 95 91
R-78K15-0.5 18 - 36 15 500 96 92