Document
MMDT3946
40V COMPLEMENTARY SMALL SIGNAL TRANSISTOR IN SOT363
Features
Complementary Pair: One 3904-Type NPN One 3906-Type PNP
Ultra-Small Surface Mount Package Epitaxial Planar Die Construction Ideal for Low Power Amplification and Switching Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) An Automotive-Compliant Part is Available Under Separate
Datasheet (MMDT3946Q)
Mechanical Data
Package: SOT363 Package Material: Molded Plastic, “Green” Molding Compound.
UL Flammability Classification Rating 94V-0 Moisture Sensitivity: Level 1 per J-STD-020 Terminals: Finish Matte Tin Finish. Solderable per
MIL-STD-202, Method 208 e3 Weight: 0.006 grams (Approximate)
SOT363
C2
B1
E1
Top View
E1, B1, C1 = PNP 3906 E2, B2, C2 = NPN 3904
E2
B2
C1
Device Schematic and Pinout Top View
Ordering Information (Note 4)
Part Number
MMDT3946-7-F MMDT3946-7R-F
Package
SOT363 SOT363
Marking
K46 K46
Reel Size (inches)
7 7
Tape Width (mm)
8 8
Qty 3,000 3,000
Packing Carrier Reel Reel
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds. 4. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes-packaging/.
Marking Information
K46 = Product Type Marking Code YM = Date Code Marking Y = Year (ex: F = 2018) M = Month (ex: 9 = September)
Date Code Key Year Code
Month Code
2023 K
Jan 1
2024 L
Feb
Mar
2
3
2025 M
Apr 4
2026 N
May
Jun
5
6
2027 O
2028 P
Jul
Aug
Sep
7
8
9
2029 R
2030 S
Oct
Nov
Dec
O
N
D
MMDT3946
Datasheet Number DS30123 Rev.14 - 2
1 of 9 www.diodes.com
January 2024
© 2024 Copyright Diodes Incorporated. All Rights Reserved.
Absolute Maximum Ratings, NPN 3904 (@TA = +25°C, unless otherwise specified.)
Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current
Symbol VCBO VCEO VEBO IC
Value 60 40 6 200
MMDT3946
Unit V V V mA
Absolute Maximum Ratings, PNP 3906 (@TA = +25°C, unless otherwise specified.)
Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current
Symbol VCBO VCEO VEBO IC
Value -40 -40 -5 -200
Unit V V V mA
Thermal Characteristics, Total Device (@TA = +25°C, unless otherwise specified.)
Characteristic Power Dissipation (Note 5) Thermal Resistance, Junction to Ambient Air (Note 5) Operating and Storage Temperature Range
Symbol PD RJA
TJ, TSTG
Value 200 625
-55 to +150
Unit mW C/W C
Note: 5. For a device mounted on minimum recommended pad layout that is on a single-sided 0.6mm FR-4 PCB; device is measured under still air conditions while operating in a steady state.
MMDT3946
Datasheet Number DS30123 Rev.14 - 2
2 of 9 www.diodes.com
January 2024
© 2024 Copyright Diodes Incorporated. All Rights Reserved.
Thermal Characteristics and Derating Information
MMDT3946
-I Collector Current (A) C
I Collector Current (A)
C
V CE(sat)
Limit
100m DC
1s 100ms
10m
NPN T =25°C
amb
1oz Min Copper FR4
10ms 1ms 100µs
1m
100m
1
10
V Collector-Emitter Voltage (V) CE
Fig. 1 NPN - Safe Operating Area
100m
V CE(sat)
Limit
DC 1s 100ms
10m
10ms 1ms
PNP T =25°C
amb
1oz Min Copper FR4
100µs
1m
0.1
1
10
-V Collector-Emitter Voltage (V) CE
Fig. 2 PNP - Safe Operating Area
650 600 550
T =25°C amb
1oz Min Copper FR4
500
450
400 350 D=0.5
300
250
200 D=0.3 150 100
D=0.05 Single Pulse
50
D=0.1
0 100µ 1m 10m 100m 1
10 100 1k
Pulse Width (s)
Fig. 3 Transient Thermal Impedance
Max Power Dissipation (W)
0.25
1oz Min Copper FR4
0.20
0.15
0.10
0.05
0.00 0
25 50 75 100 125 150 175
Temperature (°C)
Fig. 4 Derating Curve
Thermal Resistance (°C/W)
Single Pulse
10
T =25°C amb
1oz Min Copper FR4
1
Max Power Dissipation (W)
0.1 100µ 1m 10m 100m 1
10 100 1k
Pulse Width (s)
Fig. 5 Pulse Power Dissipation
MMDT3946
Datasheet Number DS30123 Rev.14 - 2
3 of 9 www.diodes.com
January 2024
© 2024 Copyright Diodes Incorporated. All Rights Reserved.
MMDT3946
Electrical Characteristics, NPN 3904 (@TA = +25°C, unless otherwise specified.)
Characteristic OFF CHARACTERISTICS (Note 6) Collector-Base Breakdown Voltage Collector-Emitter Breakdown Voltage Emitter-Base Breakdown Voltage Collector Cutoff Current Base Cutoff Current ON CHARACTERISTICS (Note 6)
Static Forward Current Transfer Ratio
Collector-Emitter Saturation Voltage
Base-Emitter Saturation Voltage SMALL SIGNAL CHARACTERISTICS Output Capacitance Input Capacitance Input Impedance Voltage Feedback Ratio Small Signal C.