CRE1 Series
www.murata-ps.com
Isolated 1W Single Output Isolated DC-DC Converters
SELECTION GUIDE
% mV p-p % MIL. Tel.
V V mA mA pF
Typ. Max. Typ. Max. Min. Typ. kHrs
CRE1S0505DC 5 5 200 12 14 16 40 286 65 70 30
CRE1S0505SC 5 5 200 12 14 16 40 286 65 70 30
CRE1S0515SC 5 15 67 6 7.5 10 25 250 77 80 40
FEATURES
CRE1S1205SC 12 5 200 8 10 12 30 117 68 71 33
3
UL 60950 recognised
n
CRE1S1212SC 12 12 83 4 5 8 20 104 75 80 55
CRE1S2405SC 24 5 200 8.5 10 13 30 58 67 71 40
Single Isolated output
n
CRE1S2412SC 24 12 83 3 4 10 25 52 75 80 78
1kVDC or 3kVDC option Hi Pot Test
n
3KVDC isolation options
CRE1S0305S3C 3.3 5 200 10 12 15 25 400 72 75 35
Wide temperature performance at full
n
4 CRE1S0505S3C 5 5 200 6 8 15 25 250 73 77 24
1W load -40C to 85C
n
Surface mount options
Industry Standard Pinout
n
CRE1S0505MC 5 5 200 12.8 15 62 85 294 68 35 6857
CRE1S0505MEC 5 5 200 6.5 8 25 70 239 79 82 22 3041
3.3V, 5V, 12V & 24V Inputs
n
INPUT CHARACTERISTICS
5V, 12V & 15V outputs
n
Parameter Conditions Min. Typ. Max. Units
Pin Compatible with CME, CRL2, LME,
n
Continuous operation, 3.3V input types 2.97 3.3 3.63
V
MEE1, MEE3, MTE1, NKE, NME, NML &
Continuous operation, 5V input types 4.5 5.0 5.5
Voltage range
NTE series
Continuous operation, 12V input types 10.8 12 13.2
Continuous operation, 24V input types 21.6 24 26.4
Through hole and surface mount options
n
3.3V & 12V input types 1 15
available
n
5V & 24V input types 2 15
Reflected ripple current mA p-p
CRE1S0505MC 30 47
PRODUCT OVERVIEW
CRE1S0505MEC 5 15
The CRE1 series are a cost effective 1W DC-DC
converter series, in industry standard packages
OUTPUT CHARACTERISTICS
with industry standard pinout. Popular input
Parameter Conditions Min. Typ. Max. Units
and output voltages are available. The galvanic 3
Rated Power TA=-40C to 85C 1 W
isolation allows the device to be configured to
Voltage Set Point Accuracy See tolerance envelope
provide an isolated negative rail in systems where
Line regulation High VIN to low VIN 1.1 1.2 %/%
only positive rails exist. The wide temperature
range guarantees startup from 40C and full 1
ISOLATION CHARACTERISTICS
3
watt output at 85C .
Parameter Conditions Min. Typ. Max. Units
C Versions Flash tested for 1 second 1000
Isolation test voltage VDC
3C Versions Flash tested for 1 second 3000
Resistance Viso= 1000VDC 10 G
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
3.3V input types 115
5V input types 110 kHz
Switching frequency
12V input types 145
24V input types 100
CRE1S0505MEC 80
1. If components are required in tape and reel format suffix order code with -R, e.g. CRE1S0505MC-R.
2. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load.
3. UL 60950 recognition does not apply to CRE1S0505MC.
4. 24V input parts prior to date code D1635 have operating temperature range of 0 to 70C.
For full details go to
www.murata-ps.com/rohs
All specifications typical at T A=25C, nominal input voltage and rated output current unless otherwise specified.
www.murata-ps.com/support
KDC_CRE1.D02 Page 1 of 14
1
Order Code
Nominal Input
Voltage
Output
Voltage
Output Current
Load Regulation
Ripple & Noise
Input Current
at Rated Load
Efficiency
Isolation
Capacitance
2
MTTFCRE1 Series
Isolated 1W Single Output Isolated DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 260C
Input voltage VIN, 3.3V input 5.5V
Input voltage VIN, 5V input 7V
Input voltage VIN, 12V input 15V
Input voltage VIN, 24V input 28V
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
1
-40 85
Specification All output types
Storage -50 130
5V output types 41
C
Case temperature rise above All other output types 32
ambient
CRE1S0505MC 43
CRE1S0505MEC 12.5
Cooling Free air convection
TECHNICAL NOTES
ISOLATION VOLTAGE
Hi Pot Test, Flash Tested, Withstand Voltage, Proof Voltage, Dielectric Withstand Voltage & Isolation Test Voltage are all terms that relate to the same thing, a test voltage,
applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions CRE1 series of DC-DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for C versions and 3kVDC for
1 second for 3C versions.
A question commonly asked is, What is the continuous voltage that can be applied across the part in normal operation?
The CRE1 series, through hole variants (excluding surface mount variants) have been recognised by Underwriters Laboratory for functional insulation, both input and output should
normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part
should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the
isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier
between these circuits and any user-accessible circuitry according to safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials,
construction and environment. The CRE1 series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled wire. While
parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically
polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We
therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
SAFETY APPROVAL
The CRE1 series has been recognised by Underwriters Laboratory (UL) to UL60950 for functional insulation in a maximum still air ambient temperature of 100C for the C versions
and 130C for the 3C versions as measured on the case of the unit (hotspot). The CRE1S0505MC is not currently UL recognised.
The CRE1 series of converters are not internally fused so to meet the requirements of UL60950 an anti-surge input line fuse should always be used with ratings as defined belo w.
CRE1S03xxS3C: 1A
CRE1S05xxxxC: 0.7A
CRE1S12xxSC: 0.2A
CRE1S24xxSC: 0.16A
All fuses should be UL recognised, 125V rated.
File number E151252 applies.
1. 24V input parts prior to date code D1635 have operating temperature range of 0 to 70C.
www.murata-ps.com/support
KDC_CRE1.D02 Page 2 of 14