78250 Datasheet, PDF (1/2 Pages) C&D Technologies – Converter Transformers

78250 SERIES
Converter Transformers
SELECTION GUIDE 78250/78250M
Parameter
Conditions
Primary Inductance, L_P
10kHz, 100mV
Leakage Inductance, L_L
100kHz, 100mV
Interwinding Capacitance, C _WW 100kHz, 100mV
D.C. Resistance, R_DC
<0.1VDC
FEATURES
s Maxim Compatible
s Isolation to 4kV
s Surface Mount Options
s Toroidal Construction
s Standard Pinout
s UL 94V-0 Package Material
s Fully Encapsulated
s Low Profile
s Industrial Temperature Range
DESCRIPTION
The 78250 series of converter transformers
are specifically designed for use with Maxim
chipsets to provide isolated RS232 interfaces.
Carefully controlled turns ratios ensur e
consistent performance whilst a toroidal
construction minimises EMI. The surface
mount devices are fully compatible with
CECC00802 to 280°C which allows them to
be placed and reflowed with IC’s thus
reducing time and cost in production.
Volt-time Product, E_T
5kHz, 5V
SELECTION GUIDE 78250V/78250MV
Parameter
Conditions
Primary Inductance, L_P
10kHz, 100mV
Leakage Inductance, L_L
100kHz, 100mV
Interwinding Capacitance, C _WW 100kHz, 100mV
D.C. Resistance, R_DC
<0.1VDC
Volt-time Product, E_T
5kHz, 5V
ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range
Storage temperature range
Lead Temperature 1.5mm from case for 10 seconds
Peak current I_PK
Isolation voltage 78250(M) (flash tested for 1 second)
Isolation voltage 78250V(M) (flash tested for 1 second)
All specifications typical at TA=25°C.
MIN TYP MAX Units
1.0 2.0 2.5 mH
2.0 3.0 µH
69 90 pF
1.0 2.0 Ω
50
Vµs
MIN TYP MAX Units
1.0 2.0 2.5 mH
35 40 µH
9
12 pF
1.4 1.8 Ω
50
Vµs
–40°C to 85°C
–50°C to 125°C
300°C
300mA
1500Vrms
4000Vrms
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