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LM5069: MOSFET Selection

AMARNADH CH
Prodigy 90 points
Part Number: LM5069

Dear Team,

In one of our design we are using this part and suggested MOSFET SUM40N15-38-E3. Due to the obsolence of the MOSFET we are planning to use PHB45NQ15T,118 opart.

But the input capacitance is different from theSUM40N15-38-E3.

Can we use this part and what is the maximum capacitance of the Gate pin of the LM5609. Please find the differences between the two parts. Please suggest

Existing part Alternate part
SUM40N15-38-E3 PHB45NQ15T,118
Vishay Siliconex NEXPERIA
N-Channel N-Channel
MOSFET MOSFET
150V 150V
40A (Tc) 45.1A (Tc)
6V,10V 10V
38mOhm @ 15A, 10V 42mOhm @ 20A, 10V
4V @ 250µA 4V @ 1mA
60nC @ 10V, 38nC (Typ) 32nC @ 10V (Typ)
4V @ Id= 250uA  (Abs Max. ±20V) 4V @ Id= 1mA(Abs Max. ±20V)
2500pF @ 25V (Typ) 1770pF @ 25V (Typ)
290pF @ 25V (Typ) 290pF @ 25V (Typ)
3.75W (Ta), 166W (Tc) 230W (Tc)
 -55°C ~ 175°C (TJ)  -55°C ~ 175°C (TJ)
TO-263 (D2Pak) D2PAK
ROHS3 Compliant ROHS3 Compliant
Obsolete Active
  • 0
    Prodigy 90 points

    Please find the comparison:

    Existing part Alternate part
    Manufacturer Part number SUM40N15-38-E3 PHB45NQ15T,118
    Manufacturer Vishay Siliconex NEXPERIA
    FET Type N-Channel N-Channel
    Technology MOSFET MOSFET
    Drain to Source Voltage (VDss) 150V 150V
    Current -Continuous Drain (Id) @ 25°C 40A (Tc) 45.1A (Tc)
    Drive Voltage (Max Rds On, Min Rds On) 6V,10V 10V
    Rds On (Max) @ Id, Vgs 38mOhm @ 15A, 10V 42mOhm @ 20A, 10V
    Vgs(th) (Max) @ Id 4V @ 250µA 4V @ 1mA
    Gate Charge (Qg) (Max) @ Vgs 60nC @ 10V, 38nC (Typ) 32nC @ 10V (Typ)
    Vgs (Max) @ Vds= Vgs,  4V @ Id= 250uA  (Abs Max. ±20V) 4V @ Id= 1mA(Abs Max. ±20V)
    Input Capacitance (Ciss) (Max) @ Vds 2500pF @ 25V (Typ) 1770pF @ 25V (Typ)
    Output Capacitance (Coss) @ Vds 290pF @ 25V (Typ) 290pF @ 25V (Typ)
    Power Dissipation (Max) 3.75W (Ta), 166W (Tc) 230W (Tc)
    Operating Temperature  -55°C ~ 175°C (TJ)  -55°C ~ 175°C (TJ)
    Supplier Device Package TO-263 (D2Pak) D2PAK
    RoHS ROHS3 Compliant ROHS3 Compliant
    Part Status Obsolete Active
  • 0 in reply to AMARNADH CH
    TI__Guru** 105361 points

    Hi Amarnadh,

    Input capacitance is not a concern as long as the new MOSFET meets the SOA design margin. Please use the design calculator to verify the SOA margin for your design. The design calculator is available at http://www.ti.com/product/LM5069/toolssoftware

    What is the max load current of your system and the application use case ?

    Regards, Rakesh

  • 0 in reply to Rakesh
    Prodigy 90 points

    Hi Rakesh,

    Thank you for your support.

    Checked the SOA also between two devices and both are same.

    We are using for 24V and max 4A and I think it is not a problem.

    Regards

    Amarnadh