78250MC Murata Power Solutions Inc, 78250MC Datasheet

XFRMR MAX250 1.5KVDC 2.5 MH SMD

78250MC

Manufacturer Part Number
78250MC
Description
XFRMR MAX250 1.5KVDC 2.5 MH SMD
Manufacturer
Murata Power Solutions Inc
Series
78250r
Type
Converter Transformersr
Datasheet

Specifications of 78250MC

Inductance
2mH
Mounting Style
SMD/SMT
Dimensions
12.7 mm L x 8.99 mm W x 6.35 mm H
Product
Toroidal Power Transformers
Height
6.35 mm
Length
12.7 mm
Number Of Outputs
1
Operating Temperature Range
- 40 C to + 85 C
Termination Style
Solder Pad
Width
8.99 mm
Lead Free Status / RoHS Status
Contains lead / RoHS Compliant
For Use With/related Products
MAX250
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
811-1276-5

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
78250MC
Manufacturer:
C&D
Quantity:
11
Part Number:
78250MC-R
Manufacturer:
SHARP
Quantity:
12 000
FEATURES
DESCRIPTION
The 78250 series of converter transformers
are specifi cally designed for use with Maxim
chipsets to provide isolated RS232 interfaces.
Carefully controlled turns ratios ensure consistent
performance whilst a toroidal construction
minimises EMI.
RoHS compliant
Maxim MAX250/MAX251 compatible
Isolation to 4kVrms
Industry-standard pinout
Surface mount option
UL 94 V-0 package materials
Low profi le
Toroidal construction
Fully encapsulated
Industrial temperature range
www.murata-ps.com/rohs
For full details go to
All specifi cations typical at T
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS 78250C/78250MC
Parameter
Primary Inductance, L
Leakage Inductance, L
Interwinding Capacitance, C
Primary D.C. Resistance, R
Volt-time Product, Et
CHARACTERISTICS 78250VC/78250MVC
Parameter
Primary Inductance, L
Leakage Inductance, L
Interwinding Capacitance, C
Primary D.C. Resistance, R
Volt-time Product, Et
ORDER CODE DETAILS
Operating free air temperature range
Storage temperature range
Lead temperature 1.5mm from case for 10 seconds
Peak current, I
Isolation voltage 78250(M)C (fl ash tested for 1 second)
Isolation voltage 78250V(M)C (fl ash tested for 1 second)
TECHNICAL NOTES
ISOLATION
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Volt-
age’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’
are all terms that relate to the same thing, a test voltage,
applied for a specifi ed time, across a component designed
to provide electrical isolation, to verify the integrity of that
isolation.
All products in this series are 100% production tested at
their stated isolation voltage.
A question commonly asked is, “What is the continuous
voltage that can be applied across the part in normal opera-
tion?”
For a part holding no specifi c agency approvals both input
and output should normally be maintained within SELV limits
i.e. less than 42.4V peak, or 60VDC. The isolation test volt-
age 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 cor-
rectly 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-acces-
sible circuitry according to safety standard requirements.
78250MC-R / 78250MVC-R
78250MC / 78250MVC
78250C / 78250VC
Order Code
VOLTAGE
PK
P
P
L
L
A
=25°C
DC
DC
WW
WW
Conditions
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
Pins1/2 or 2/3
Conditions
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
Pins1/2 or 2/3
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232
Package Type
MAX250/MAX251 Compatible Converter Transformers
6 Pin DIL
6 Pin SM
6 Pin SM
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 environ-
ment. This series has toroidal isolation transformers,
with no additional insulation between primary and
secondary windings of enameled wire. While parts
can be expected to withstand several times the
stated test voltage, the isolation capability does de-
pend 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 there-
fore strongly advise against repeated high voltage
isolation testing, but if it is absolutely required, that
the voltage be reduced by 20% from specifi ed test
voltage.
This consideration equally applies to agency recog-
nized parts rated for better than functional isolation
where the wire enamel insulation is always supple-
mented by a further insulation system of physical
spacing or barriers.
Min.
Min.
Packaging Type
1.0
1.0
2011-04-04 KMP_78250C_C04 Page 1 of 3
50
50
Tape & Reel
Tube
Tube
78250 Series
Typ.
Typ.
2.0
2.0
1.0
2.0
1.4
69
35
9
-40°C to 85°C
-50°C to 125°C
300°C
300mA
1.5kVrms
4.0kVrms
Max.
Max.
2.5
3.0
2.0
2.5
1.8
90
40
12
Quantity
500
50
50
Units
Units
mH
Vμs
mH
Vμs
μH
μH
pF
pF
Ω
Ω

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78250MC Summary of contents

Page 1

... Pins1/2 or 2/3 ORDER CODE DETAILS Order Code Package Type 78250C / 78250VC 6 Pin DIL 78250MC / 78250MVC 6 Pin SM 78250MC-R / 78250MVC-R 6 Pin SM ABSOLUTE MAXIMUM RATINGS Operating free air temperature range Storage temperature range Lead temperature 1.5mm from case for 10 seconds Peak current Isolation voltage 78250(M)C (fl ash tested for 1 second) Isolation voltage 78250V(M)C (fl ...

Page 2

... MAX250/MAX251 Compatible Converter Transformers 0.5 (12.70) 0.375 (9.52) Max. Primary 1 0.354 2 78250MC (9.0) Max. XYYWW 3 0.25 (6.35) 0.035 (0.90) 0.1 (2.54) Unless otherwise stated all dimensions in inches (mm) ±0.01 (0.25). All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position. ...

Page 3

... Cover tape 0.283 (7.20) Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED www.murata-ps.com/locations MAX250/MAX251 Compatible Converter Transformers * 2.36 (60) Min. 0.94-1.08 (23.9-27.4) 0.53 (13.50) Ø 0.50 (12.80) 1.20 (30.4) Max. ...

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