78250J Datasheet PDF - Murata

Part Number 78250J
Description Transformers
Manufacturers Murata 
Logo Murata Logo 

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78250J Series
MAX250/MAX251 Compatible Converter SM Transformers
n J-STD-020D reflow
n RoHS compliant
n Maxim MAX250/MAX251 compatible
n Isolation to 4kVrms
n Industry-standard pinout
n Surface mount option
n UL 94 V-0 package materials
n Low profile
n Toroidal construction
n Industrial temperature range
The 78250 series of converter transformers
are specifically designed for use with Maxim
chipsets to provide isolated RS232 interfaces.
Carefully controlled turns ratios ensure consistent
performance whilst a toroidal construction
minimises EMI.
For through hole versions see 78250 datasheet.
For full details go to
Primary Inductance, LP
Leakage Inductance, LL
Interwinding Capacitance, CWW
Primary D.C. Resistance, RDC
Volt-time Product, Et
Turns Ratio
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
Pins1/2 or 2/3
Min. Typ. Max. Units
1.0 2.0 2.5 mH
0.6 3.0 μH
48 90 pF
0.7 2.0
50 Vμs
Primary Inductance, LP
Leakage Inductance, LL
Interwinding Capacitance, CWW
Primary D.C. Resistance, RDC
Volt-time Product, Et
Turns Ratio
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
Pins1/2 or 2/3
Min. Typ. Max. Units
1.0 2.0 2.5 mH
35 40 μH
4 10 pF
0.9 1.8
50 Vμs
Order Code
78250JC / 78250JVC
78250JC-R / 78250JVC-R
Package Type
6 Pin SM
6 Pin SM
Packaging Type
Tape & Reel
Operating free air temperature range
Storage temperature range
Lead temperature 1.5mm from case for 10 seconds
Peak current, IPK
Isolation voltage 78250(J)C (flash tested for 1 second)
Isolation voltage 78250V(J)C (flash tested for 1 second)
-40°C to 85°C
-50°C to 125°C
All specifications typical at TA=25°C
‘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 electri-
cal 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 volt-
age that can be applied across the part in normal operation?”
For a part holding no specific 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-accessi-
ble circuitry according to safety standard requirements.
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 depend on
the wire insulation. Any material, including this enamel
(typically polyurethane) is susceptible to eventual
chemical degradation when subject to very high ap-
plied 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 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.
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