Automotive Junction Box

Automotive Junction Box

Such as reduction of power consumption and miniaturization are important in junction box. Toshiba provides information on a wide range of semiconductor products suitable for mechanical relay system, semiconductor relay system, etc., along with circuit configuration examples.

Overall block diagram

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 MCU MCU ECU ECU Heater Heater LED LED CAN Line CAN Line OUT1 OUT1 OUT2 OUT2 OUT3 OUT3 OUTx OUTx GND GND GND GND Battery (12 V) Battery(12 V) Junction Box Junction Box Fuse Fuse Driver Driver Driver Driver Driver Driver Driver Driver Free Wheeling Diode Free Wheeling Diode TVS TVS M M Mechanical Relay Mechanical Relay TVS TVS Power Supply PowerSupply Mechanical relay system
Mechanical relay system

Example of junction box circuit of mechanical relay system

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 Power Supply PowerSupply ECU ECU Heater Heater LED LED Gate Driver Gate Driver Gate Driver Gate Driver Gate Driver Gate Driver CAN Line CAN Line Junction Box Junction Box GND GND GND GND OUT1 OUT1 OUT2 OUT2 OUT3 OUT3 OUTx OUTx Battery (12 V) Battery(12 V) Gate Driver Gate Driver MCU MCU MOSFET MOSFET MOSFET MOSFET MOSFET MOSFET MOSFET MOSFET Free Wheeling Diode Free Wheeling Diode M M Semiconductor Relay Semiconductor Relay TVS TVS TVS TVS Semiconductor relay system
Semiconductor relay system

Example of junction box circuit of semiconductor relay system

Sub block diagram

Mechanical relay system
Mechanical relay system

Example of junction box circuit of mechanical relay system

Example of junction box circuit of mechanical relay system
MOSFET with a built-in active clamp circuit
Part Number
Toshiba Package Name SOT-23F SOT-23F
VDSS (Max) [V] 38 38
ID (Max) [A] 2.0 2.0
RDS(ON) (Max) [Ω] @ |VGS| = 4.5 [V] 0.41 0.176
Polarity N-ch + Active Clamp Zener N-ch + Active Clamp Zener
Low side switch / High side switch (up to 1 A)
Part Number
Toshiba Package name PS-8 PS-8 PS-8
VBB (Max) [V]      
VCC (Max) [V]      
IO (Max) [A]   1.0 0.8
General purpose small signal MOSFET
Part Number
Toshiba Package Name SOT-346 (S-Mini) SOT-346 (S-Mini) SOT-723 (VESM)
VDSS (Max) [V] 60 -60 -20
ID (Max) [A] 0.4 -0.4 -0.8
RDS(ON) (Max) [Ω] @ |VGS| = 4.5 [V] 1.75 1.9 0.39
Polarity N-ch P-ch P-ch
General purpose small signal bipolar transistor
Part Number
Toshiba Package Name SOT-416 (SSM) SOT-416 (SSM) SOT-323 (USM) SOT-323 (USM) SOT-346 (S-Mini) SOT-346 (S-Mini)
VCEO (Max) [V] -50 50 50 -50 50 -50
IC (Max) [A] -0.15 0.15 0.15 -0.15 0.15 -0.15
Polarity PNP NPN NPN PNP NPN PNP
Small signal bias resistor built-in transistor (BRT)
Part Number
Toshiba Package Name SOT-563 (ES6) SOT-563 (ES6) SOT-363 (US6) SOT-363 (US6)
VCEO (Q1) (Max) [V] 50 -50 50 -50
VCEO (Q2) (Max) [V] 50 -50 50 -50
IC (Q1) (Max) [A] 0.1 -0.1 0.1 -0.1
IC (Q2) (Max) [A] 0.1 -0.1 0.1 -0.1
Polarity (Q1) NPN PNP NPN PNP
Polarity (Q2) NPN PNP NPN PNP
TVS diode (for CAN communication)
Part Number
Toshiba Package Name SOT-323 (USM) SOT-323 (USM) SOT-323 (USM)
VESD (Max) [kV] +/-30 +/-25 +/-20
IR (Max) [µA] 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.8 1.1 1.5
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 9 9 6.5
Semiconductor relay system
Semiconductor relay system

Example of junction box circuit of semiconductor relay system

Example of junction box circuit of semiconductor relay system
U-MOS Series 40 V N-ch MOSFET
Part Number
Toshiba Package Name TSON Advance(WF) DPAK+ SOP Advance(WF) DSOP Advance(WF)L S-TOGL L-TOGL
VDSS (Max) [V] 40 40 40 40 40 40
ID (Max) [A] 40 120 150 150 200 400
RDS(ON) (Max) [Ω] @ |VGS| = 10.0 [V] 0.0038 0.00135 0.00079 0.00079 0.00066 0.00030
Polarity N-ch N-ch N-ch N-ch N-ch N-ch
Gate driver (for switch)
Part Number
Toshiba Package name PS-8 SSOP16 WSON10A
VBB (Max) [V]      
VCC (Max) [V]      
IO (Max) [A] +5mA/ Internally Limited   Internally Limited /-5m
General purpose small signal MOSFET
Part Number
Toshiba Package Name SOT-346 (S-Mini) SOT-346 (S-Mini) SOT-723 (VESM)
VDSS (Max) [V] 60 -60 -20
ID (Max) [A] 0.4 -0.4 -0.8
RDS(ON) (Max) [Ω] @ |VGS| = 4.5 [V] 1.75 1.9 0.39
Polarity N-ch P-ch P-ch
General purpose small signal bipolar transistor
Part Number
Toshiba Package Name SOT-416 (SSM) SOT-416 (SSM) SOT-323 (USM) SOT-323 (USM) SOT-346 (S-Mini) SOT-346 (S-Mini)
VCEO (Max) [V] -50 50 50 -50 50 -50
IC (Max) [A] -0.15 0.15 0.15 -0.15 0.15 -0.15
Polarity PNP NPN NPN PNP NPN PNP
Small signal bias resistor built-in transistor (BRT)
Part Number
Toshiba Package Name SOT-563 (ES6) SOT-563 (ES6) SOT-363 (US6) SOT-363 (US6)
VCEO (Q1) (Max) [V] 50 -50 50 -50
VCEO (Q2) (Max) [V] 50 -50 50 -50
IC (Q1) (Max) [A] 0.1 -0.1 0.1 -0.1
IC (Q2) (Max) [A] 0.1 -0.1 0.1 -0.1
Polarity (Q1) NPN PNP NPN PNP
Polarity (Q2) NPN PNP NPN PNP
TVS diode (for CAN communication)
Part Number
Toshiba Package Name SOT-323 (USM) SOT-323 (USM) SOT-323 (USM)
VESD (Max) [kV] +/-30 +/-25 +/-20
IR (Max) [µA] 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.8 1.1 1.5
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 9 9 6.5

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