P-Channel Enhancement Mode MOSFET
Formosa MS
AS3423B
Product Summary 
V(BR)DSS RDS(on)MAX ID 
90mΩ@-4.5V 
-20V -3A 
110mΩ@-2.5V 
Feature Application 
 Advanced trench process technology Load Switch for Portable Devices 
 High density cell design for ultra low on-resistance DC/DC Converter 
Package Circuit diagram 
 SOT-23-3L
Marking 
AS23 
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TEL:886-755-27188611
FM-3150321 2003/03/08 2012/05/16 D 3 
FAX:886-755-27188568
P-Channel Enhancement Mode MOSFET
Formosa MS
AS3423B
Absolute maximum ratings (Ta=25℃ unless otherwise noted) 
Parameter Symbol Value Unit 
Drain-Source Voltage VDS -20 V 
Gate-Source Voltage VGS ±10 V 
Continuous Drain Current ID -3 A 
Pulsed Drain Current IDM -10 A 
Power Dissipation PD 1 W 
Junction Temperature TJ 150 ℃ 
Storage Temperature TSTG -55 ~ +150 ℃ 
Electrical characteristics (TA=25 oC, unless otherwise noted) 
Parameter Symbol Test Condition Min. Typ. Max. Unit 
Static Characteristics 
Drain-source breakdown voltage V(BR)DSS VGS = 0V, ID =-250µA -20 V 
Zero gate voltage drain current IDSS VDS =-16V,VGS = 0V -1 µA 
Gate-body leakage current IGSS VGS =±10V, VDS = 0V ±100 nA 
Gate threshold voltage VGS(th) VDS =VGS, ID =-250µA -0.5 -1.5 V 
VGS =-4.5V, ID =-3A 70 90 
Drain-source on-resistance1) RDS(on) mΩ 
VGS =-2.5V, ID =-2A 90 110 
Dynamic characteristics2) 
Input Capacitance Ciss 500 
VDS =-10V,VGS =0V,f =1MHz pF 
Output Capacitance Coss 100 
Turn-on delay time td(on) 10 
VDD=-10V, ID =-3A, RGEN=6Ω nS 
Turn-off delay time td(off) 60 
Source-Drain Diode characteristics 
Diode Forward voltage VDS VGS =0V, IS=-0.75A -1.5 V 
Notes: 
1) Pulse Test: Pulse Width < 300µs, Duty Cycle ≤2%. 
2) Guaranteed by design, not subject to production testing. 
http://www.formosagr.com Document ID Issued Date Revised Date Revision Page. 
Page 2 
TEL:886-755-27188611
FM-3150321 2003/03/08 2012/05/16 D 3 
FAX:886-755-27188568
P-Channel Enhancement Mode MOSFET
Formosa MS
AS3423B
 SOT-23-3L Package Information
Dimensions In Millimeters Dimensions In Inches 
Dimensions In Millimeters Dimensions In
Symbol 
Min. Max. Min. Max. 
A 0.900 1.150 0.035 0.045 
A1 0.000 0.100 0.000 0.004 
A2 0.900 1.050 0.035 0.041 
b 0.300 0.500 0.012 0.020 
c 0.080 0.150 0.003 0.006 
D 2.800 3.000 0.110 0.118 
E 1.500 1.700 0.059 0.067 
E1 2.250 2.550 0.089 0.100 
e 0.950 TYP. 0.037 TYP. 
0.
 e1 1.800 2.000 0.071 0.079 
L 0.550 REF. 0.022 REF. 
0.
L1 0.300 0.500 0.012 0.020 
http://www.formosagr.com Document ID Issued Date Revised Date Revision Page. 
Page 3 
TEL:886-755-27188611
FM-3150321 2003/03/08 2012/05/16 D 3 
FAX:886-755-27188568