LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-1/11
1
3
2
NPN
LMBT3904WT1
PNP
LMBT3906WT1
CASE 419–02, STYLE 3
SOT– 323 / SC–70
MAXIMUM RATINGS
Rating Symbol Value Unit
Collector–Emitter Voltage LMBT3904WT1 V CEO 40 Vdc
LMBT3906WT1 – 40
Collector–Base Voltage LMBT3904WT1 V CBO 60 Vdc
LMBT3906WT1 – 40
Emitter–Base Voltage LMBT3904WT1 V EBO 6.0 Vdc
LMBT3906WT1 – 5.0
C
ollector Current — Continuous
LMBT3904WT1 I C200 mAdc
LMBT3906WT1 – 200
THERMAL CHARACTERISTICS
Characteristic Symbol Max Unit
Total Device Dissipation (1) P D150 mW
T A=25 °C
Thermal Resistance, Junction to Ambient R θJA 833 °C/W
Junction and Storage Temperature T J, T stg
–55 to +150
°C
General Purpose Transistors
NPN and PNP Silicon
These transistors are designed for general purpose amplifier applications. They are housed
in the SOT–323/SC–70 which is designed for low power surface mount applications.
GENERAL PURPOSE
AMPLIFIER TRANSISTORS
SURFACE MOUNT
ƽ Pb-Free Package is available.
DEVICE MARKING AND ORDERING INFORMATION
Device Marking Package Shipping
LMBT3904WT1 AM SOT-323/SC-70 3000/Tape&Reel
LMBT3904WT1G AM
(Pb-Free) SOT-323/SC-70 3000/Tape&Reel
LMBT3906WT1 2A SOT-323/SC-70 3000/Tape&Reel
LMBT3906WT1G 2A
(Pb-Free) SOT-323/SC-70 3000/Tape&Reel
2
EMITTER
3
COLLECTOR
1
BASE
2
EMITTER
3
COLLECTOR
1
BASE
LMBT3904WT1
LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-2/11
ELECTRICAL CHARACTERISTICS (T A=2C unless otherwise noted)
Characteristic Symbol Min Max Unit
OFF CHARACTERISTICS
Collector–Emitter Breakdown Voltage (2)
(I C= 1.0 mAdc, I B= 0) LMBT3904WT1 V (BR)CEO 40 Vdc
(I C= –1.0 mAdc, I B= 0) LMBT3906WT1 – 40
Collector–Base Breakdown V oltage
(I C= 10 µAdc, I E= 0) LMBT3904WT1 V(BR)CBO 60 Vdc
(I C= –10 µAdc, I E= 0) LMBT3906WT1 – 40
Emitter–Base Breakdown V oltage
(IE= 10 µAdc, I C= 0) LMBT3904WT1 V(BR)EBO 6.0 Vdc
(I E= –10 µAdc, I C= 0) LMBT3906WT1 – 5.0
Base Cutoff Current
(V CE = 30 Vdc, V EB = 3.0 Vdc) LMBT3904WT1 I BL 50 nAdc
(V CE = –30 Vdc, V EB = –3.0 Vdc) LMBT3906WT1 -50
Collector Cutoff Current
(V CE = 30 Vdc, V EB = 3.0 Vdc) LMBT3904WT1 I CEX 50 nAdc
(V CE = –30 Vdc, V EB = –3.0 Vdc) LMBT3906WT1 50
1. Device mounted on FR4 glass epoxy printed circuit board using the minimum recommended footprint.
2. Pulse Test: Pulse Width
<
300 µs; Duty Cycle
<
2.0%.
NPN LMBT3904WT1 PNP LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-3/11
NPN LMBT3904WT1 PNP LMBT3906WT1
ELECTRICAL CHARACTERISTICS (T A= 25°C unless otherwise noted) (Continued)
Characteristic Symbol Min Ma x Unit
ON CHARACTERISTICS (2)
DC Current Gain h FE ––
(I C= 0.1 mAdc, V CE = 1.0 Vdc) LMBT3904WT1 40 ––
(I C= 1.0 mAdc, V CE = 1.0 Vdc) 70 ––
(I C= 10 mAdc, V CE = 1.0 Vdc) 10 0 300
(I C= 50 mAdc, V CE = 1.0 Vdc) 60 ––
(I C= 100 mAdc, V CE = 1.0 Vdc) 30 ––
(I C= –0.1 mAdc, V CE = –1.0 Vdc) LMBT3906WT1 60 ––
(I C= –1.0 mAdc, V CE = –1.0 Vdc) 80 ––
(I C= –10 mAdc, V CE = –1.0 Vdc) 100 300
(I C= –50 mAdc, V CE = –1.0 Vdc) 60 ––
(I C= –100 mAdc, V CE = –1.0 Vdc) 30 ––
Collector–Emitter Saturation V oltage VCE(sat) Vdc
(I C= 10 mAdc, I B= 1.0 mAdc) LMBT3904WT1 –– 0.2
(I C= 50 mAdc, I B= 5.0 mAdc) –– 0.3
(I C= –10 mAdc, I B= –1.0 mAdc) LMBT3906WT1 –– 0.25
(I C= –50 mAdc, I B= –5.0 mAdc) –– 0.4
Base–Emitter Saturation V oltage V BE(sat) Vdc
(I C= 10 mAdc, I B= 1.0 mAdc) LMBT3904WT1 0.65 0.85
(I C= 50 mAdc, I B= 5.0 mAdc) –– 0.95
(I C= –10 mAdc, I B= –1.0 mAdc) LMBT3906WT1 0.65 0.85
(I C= –50 mAdc, I B= –5.0 mAdc) –– – 0.95
SMALL–SIGNAL CHARACTERISTICS
Current–Gain — Bandwidth Product f TMHz
(I C= 10 mAdc, V CE = 20 Vdc, f = 100 MHz) LMBT3904WT1 300 ––
(I C= –10 mAdc, V CE= –20 Vdc, f = 100 MHz) LMBT3906WT1 250 ––
Output Capacitance C obo pF
(V CB = 5.0 Vdc, I E= 0, f = 1.0 MHz) LMBT3904WT1 –– 4.0
(V CB= –5.0 Vdc, I E= 0, f = 1.0 MHz) LMBT3906WT1 –– 4.5
Input Capacitance C ibo pF
(V EB = 0.5 Vdc, I C= 0, f = 1.0 MHz) LMBT3904WT1 –– 8.0
(V EB = –0.5 Vdc, I C= 0, f = 1.0 MHz) LMBT3906WT1 –– 10.0
Input Impedance h ie k
(V CE= 10 Vdc, I C= 1.0 mAdc, f = 1.0 kHz) LMBT3904WT1 1.0 10
(V CE= –10 Vdc, I C= –1.0 mAdc, f = 1.0 kHz) LMBT3906WT1 2.0 12
Voltage Feedback Ratio h re X 10 –4
(V CE= 10 Vdc, I C= 1.0 mAdc, f = 1.0 kHz) LMBT3904WT1 0.5 8.0
(V CE= –10 Vdc, I C = –1.0 mAdc, f = 1.0 kHz) LMBT3906WT1 0.1 10
Small–Signal Current Gain h fe
(V CE= 10 Vdc, I C= 1.0 mAdc, f = 1.0 kHz) LMBT3904WT1 100 400
(V CE= –10 Vdc, I C= –1.0 mAdc, f = 1.0 kHz) LMBT3906WT1 100 400
Output Admittance h oe µmhos
(V CE= 10 Vdc, I C = 1.0 mAdc, f = 1.0 kHz) LMBT3904WT1 1.0 40
(V CE= –10 Vdc, I C = –1.0 mAdc, f = 1.0 kHz) LMBT3906WT1 3.0 60
Noise Figure NF dB
(V
CE
= 5.0Vdc, I
C
= 100µAdc, R
S
=1.0 k, f =1.0kHz)
LMBT3904WT1 –– 5.0
(V
CE
= –5.0Vdc, I
C
= –100 µAdc, R
S
=1.0 k, f =1.0kHz)
LMBT3906WT1 –– 4.0
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-4/11
SWITCHING CHARACTERISTICS
Delay Time (V CC = 3.0 Vdc, V BE = –0.5 Vdc) LMBT3904WT1 t d—35
(V CC = –3.0 Vdc, V BE = 0.5 Vdc) LMBT3906WT1 35 ns
Rise Time (I C = 10 mAdc, I B1 = 1.0 mAdc) LMBT3904WT1 t r—35
(I C = –10 mAdc, I B1 = –1.0 mAdc) LMBT3906WT1 35 ns
Storage Time (V CC = 3.0 Vdc, I C= 10 mAdc) LMBT3904WT1 t s 200
(V CC = –3.0 Vdc, I C = –10 mAdc) LMBT3906WT1 2 25 ns
Fall Time (I B1 = I B2 = 1.0 mAdc) LMBT3904WT1 t f—50
(I B1 = I B2 = –1.0 mAdc) LMBT3906WT1 75 ns
Figure 1. Delay and Rise Time
Equivalent Test Circuit
LMBT3904WT1
*Total shunt capacitance of test jig and connectors
10 k
+3 V
275
CS< 4.0 pF*
10 k
+3 V
275
CS< 4.0 pF*
1N916
300 ns
DUTY CYCLE = 2%
– 0.5 V
10 < t 1< 500 µs
DUTY CYCLE = 2% +10.9 V
<1.0 ns
<1 ns
+10.9 V t1
– 9.1 V
0
Figure 2. Storage and Fall Time
Equivalent Test Circuit
TYPICAL TRANSIENT CHARACTERISTICS
IC, COLLECTOR CURRENT (mA)
Figure 4. Charge Data
REVERSE BIAS VOLTAGE (VOLTS)
Figure 3. Capacitance
VCC = 40 V
IC/ I B= 10
Q
T
LMBT3904WT1
T
J
= 25°C
T
J
= 125°C
LMBT3904WT1
C
obo
C
ibo
Q
A
NPN LMBT3904WT1 PNP LMBT3906WT1
1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 2000.1 0.2 0.3 0.5 0.7 1.0 2.0 3.0 5.0 7.0 10 20 30 40
10
7.0
5.0
3.0
2.0
1.0
5000
3000
2000
1000
700
500
300
200
100
70
50
Q, CHARGE (pC)
CAPACITANCE (pF)
2. Pulse Test: Pulse Width
<
300 µs; Duty Cycle
<
2.0%.
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-5/11
NPN LMBT3904WT1 PNP LMBT3906WT1
SOURCE RESISTANCE= 200
I
C
= 1.0 mA
IC, COLLECTOR CURRENT (mA)
Figure 8. Fall Time
IC, COLLECTOR CURRENT (mA)
Figure 7. Storage Time
IC, COLLECTOR CURRENT (mA)
Figure 6. Rise Time
IC, COLLECTOR CURRENT (mA)
Figure 5. Turn–On Time
TIME (ns)
tr, RISE TIME (ns)
t f, FALL TIME (ns)
t ’ s, ST ORAGE TIME (ns)
TYPICAL AUDIO SMALL–SIGNAL CHARACTERISTICS
NOISE FIGURE VARIATIONS
(V CE = 5.0 Vdc, T A= 25°C, Bandwidth = 1.0 Hz)
f, FREQUENCY (kHz)
Figure 9. Noise Figure RS, SOURCE RESISTANCE (k)
Figure 10. Noise Figure
NF, NOISE FIGURE (dB)
NF, NOISE FIGURE (dB)
V
CC
= 40 V
I
C
/I
B
= 10
VCC=40V
IB1 = I B2
I
C
/I
B
= 10
I
C
/I
B
= 20
tr@V CC=3.0V
40 V
t’s= ts–1/8t f
IB1 =I
B2
I
C
/I
B
= 10
td@V OB=0V
LMBT3904WT1
2.0 V
15 V
LMBT3904WT1
I
C
/I
B
= 10
I
C
/I
B
= 20
LMBT3904WT1
I
C
/I
B
= 10
I
C
/I
B
= 20
LMBT3904WT1
f = 1.0 kHz
I
C
= 0.5 mA
SOURCE RESISTANCE =1.0k
I
C
= 50 µA
SOURCE RESISTANCE= 500
I
C
= 100 µA
SOURCE RESISTANCE= 200
I
C
= 0.5 mA
LMBT3904WT1 LMBT3904WT1
I
C
= 1.0 mA
I
C
= 100 µA
I
C
= 50 µA
1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
500
300
200
100
70
50
30
20
10
7
51.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
500
300
200
100
70
50
30
20
10
7
5
1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
500
300
200
100
70
50
30
20
10
7
51.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
500
300
200
100
70
50
30
20
10
7
5
0.1 0.2 0.4 1.0 2.0 4.0 10 20 40 100
12
10
8
6
4
2
0
0.1 0.2 0.4 1.0 2.0 4.0 10 20 40 100
14
12
10
8
6
4
2
0
LMBT3904WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-6/11
hre, VOLTAGE FEEDBACK RATIO (X 10 –4 )
h PARAMETERS
(V CE = 10 Vdc, f = 1.0 kHz, T A= 25°C)
IC, COLLECTOR CURRENT (mA)
Figure 11. Current Gain IC, COLLECTOR CURRENT (mA)
Figure 12. Output Admittance
IC, COLLECTOR CURRENT (mA)
Figure 13. Input Impedance IC, COLLECTOR CURRENT (mA)
Figure 14. Voltage Feedback Ratio
LMBT3904WT1
hfe, CURRENT GAIN
hoe , OUTPUT ADMITTANCE ( µmhos)
hie, INPUT IMPEDANCE (k OHMS)
LMBT3904WT1
LMBT3904WT1 LMBT3904WT1
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10
300
200
100
70
50
30
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10 0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10
20
10
5.0
2.0
1.0
0.5
0.2
100
50
20
10
5
2
1
10
7.0
5.0
3.0
2.0
1.0
0.7
0.5
NPN LMBT3904WT1 PNP LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-7/11
LMBT3904WT1
TYPICAL STATIC CHARACTERISTICS
IB, BASE CURRENT (mA)
Figure 16. Collector Saturation Region
IC, COLLECTOR CURRENT (mA)
Figure 15. DC Current Gain
IC, COLLECTOR CURRENT (mA)
Figure 18. Temperature Coefficients
C , COLLECTOR CURRENT (mA)
Figure 17. “ON” Voltages
hFE , DC CURRENT GAIN (NORMALIZED)
VCE, COLLECT OR EMITTER VOLTAGE (VOLTS)
V, VOLTAGE ( VOLTS )
COEFFICIENT (mV/ °C)
IC= 1.0 mA
TJ= 25°C
+25°C TO +125°C
θVC for V CE
LMBT3904WT1
TJ= +125°C VCE = 1.0 V
+25°C
–55°C
LMBT3904WT1
10 mA
TJ= 25°C
30 mA 100 mA
V
BE(sat)
@ I
C
/I
B
=10
V
CE(sat)
@ I
C
/I
B
=10
V
BE
@ V
CE
=1.0 V
LMBT3904WT1 LMBT3904WT1
–55°C TO +25°C
+25°C TO +125°C
–55°C TO +25°C
θVB for V BE
0.1 0.2 0.3 0.5 0.7 1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
20
10
0.7
0.5
0.3
0.2
0.1
0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 0.7 1.0 2.0 3.0 5.0 7.0 10
1.0
0.8
0.6
0.4
0.2
0
1.0 2.0 5.0 10 20 50 100 200
1.2
1.0
0.8
0.6
0.4
0.2
00 20 40 60 80 100 120 140 160 180 200
1.0
0.5
0
– 0.5
–1.0
–1.5
–2.0
NPN LMBT3904WT1 PNP LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-8/11
LMBT3906WT1
V
CC
= 40 V
I
B1
= I
B2
Figure 19. Delay and Rise Time
Equivalent Test Circuit Figure 20. Storage and Fall Time
Equivalent Test Circuit
1N916 CS< 4 pF*
CS< 4 pF*
< 1 ns
+10.6 V 300 ns
DUTY CYCLE = 2%
< 1 ns
+9.1 V
10.9 V
DUTY CYCLE = 2% t1
3 V
275
10 k
3 V
275
10 k 0
10 < t 1 < 500 µs
* Total shunt capacitance of test jig and connectors
TYPICAL TRANSIENT CHARACTERISTICS
C
ibo
LMBT3906WT1 LMBT3906WT1
LMBT3906WT1
LMBT3906WT1
IC, COLLECTOR CURRENT (mA)
Figure 24. Fall Time
IC, COLLECTOR CURRENT (mA)
Figure 23. Turn–On Time
IC, COLLECTOR CURRENT (mA)
Figure 22. Charge Data
REVERSE BIAS VOLTAGE (VOLTS)
Figure 21. Capacitance
CAPACITANCE (pF)
Q, CHARGE (pC)
TIME (ns)
tf, FALL TIME (ns)
V
CC
= 40 V
I
C
/I
B
= 10 Q
T
Q
A
I
C
/I
B
= 10
t
r
@ V
CC
= 3.0 V
t
d
@ V
OB
= 0 V
40 V
15 V
2.0 V
I
C
/I
B
= 20
I
C
/I
B
= 10
1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
0.1 0.2 0.3 0.5 0.7 1.0 2.0 3.0 5.0 7.0 10 20 30 40
10.0
7.0
5.0
3.0
2.0
1.0
5000
3000
2000
1000
700
500
300
200
100
70
50
T
J
= 25°C
T
J
= 125°C
1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
500
300
200
100
70
50
30
20
10
7
51.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
500
300
200
100
70
50
30
20
10
7
5
C
obo
NPN LMBT3904WT1 PNP LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-9/11
LMBT3906WT1
TYPICAL AUDIO SMALL–SIGNAL CHARACTERISTICS
NOISE FIGURE VARIATIONS
(V CE = –5.0 Vdc, T A= 25°C, Bandwidth = 1.0 Hz)
SOURCE RESISTANCE= 200
I
C
= 1.0 mA
f, FREQUENCY (kHz)
Figure 25
NF, NOISE FIGURE (dB)
NF, NOISE FIGURE (dB)
f = 1.0 kHz
I
C
= 0.5 mA
SOURCE RESISTANCE =2.0k
I
C
= 50 µA
SOURCE RESISTANCE= 2.0k
I
C
= 100 µA
SOURCE RESISTANCE= 200
I
C
= 0.5 mA
LMBT3906WT1
I
C
= 1.0 mA
I
C
= 100 µA
I
C
= 50 µA
0.1 0.2 0.4 1.0 2.0 4.0 10 20 40 100
5.0
4.0
3.0
2.0
1.0
0
0.1 0.2 0.4 1.0 2.0 4.0 10 20 40 100
14
12
10
8
6
4
2
0
LMBT3906WT1
LMBT3906WT1 LMBT3906WT1
LMBT3906WT1
LMBT3906WT1
hre, VOLTAGE FEEDBACK RATIO (X 10 –4 )
h PARAMETERS
(V CE = –10 Vdc, f = 1.0 kHz, T A= 25°C)
IC, COLLECTOR CURRENT (mA)
Figure 27. Current Gain IC, COLLECTOR CURRENT (mA)
Figure 28. Output Admittance
IC, COLLECTOR CURRENT (mA)
Figure 29. Input Impedance IC, COLLECTOR CURRENT (mA)
Figure 30. Voltage Feedback Ratio
hfe, CURRENT GAIN
hoe , OUTPUT ADMITTANCE ( µmhos)
hie, INPUT IMPEDANCE (k)
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10
300
200
100
70
50
30 0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 7.0 10
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10 0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10
20
10
5.0
2.0
1.0
0.5
0.2
100
70
50
30
20
10
7.0
5.0
10
7.0
5.0
3.0
2.0
1.0
0.7
0.5
RS, SOURCE RESISTANCE (k)
Figure 26
NPN LMBT3904WT1 PNP LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-10/11
LMBT3906WT1
STATIC CHARACTERISTICS
IB, BASE CURRENT (mA)
Figure 32. Collector Saturation Region
IC, COLLECTOR CURRENT (mA)
Figure 31. DC Current Gain
IC, COLLECTOR CURRENT (mA)
Figure 34. Temperature Coefficients
C , COLLECTOR CURRENT (mA)
Figure 33. “ON” Voltages
hFE , DC CURRENT GAIN (NORMALIZED)
VCE, COLLECT OR EMITTER VOLTAGE (VOLTS)
V, VOLTAGE ( VOLTS )
θV, TEMPERATURE COEFFICIENT (mV/ °C)
IC=1.0 mA
TJ= 25°C
+25°C TO +125°C
θVC for V CE(sat)
LMBT3906WT1
TJ= +125°C VCE = 1.0 V
+25°C
–55°C
10 mA
TJ= 25°C
30 mA 100 mA
V
BE(sat)
@ I
C
/I
B
=10
V
CE(sat)
@ I
C
/I
B
=10
V
BE
@ V
CE
=1.0 V –55°C TO +25°C
+25°C TO +125°C
–55°C TO +25°C
θVB for V BE(sat)
0.1 0.2 0.3 0.5 0.7 1.0 2.0 3.0 5.0 7.0 10 20 30 50 70 100 200
20
10
0.7
0.5
0.3
0.2
0.1
0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 0.7 1.0 2.0 3.0 5.0 7.0 10
1.0
0.8
0.6
0.4
0.2
0
1.0 2.0 5.0 10 20 50 100 200
1.2
1.0
0.8
0.6
0.4
0.2
00 20 40 60 80 100 120 140 160 180 200
1.0
0.5
0
– 0.5
–1.0
–1.5
–2.0
LMBT3906WT1
LMBT3906WT1 LMBT3906WT1
NPN LMBT3904WT1 PNP LMBT3906WT1
LESHAN RADIO COMPANY, LTD.
LMBT3904/6WT1-11/11
NPN LMBT3904WT1 PNP LMBT3906WT1
0.7
1.9
0.028
0.65
0.025
0.65
0.025
inches
mm
0.075
0.035
0.9
NOTES:
1.
DIMENSION
I
NG AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A 0.071 0.087 1.80 2.20
K 0.017 REF 0.425 REF
L 0.026 BSC 0.650 BSC
N 0.028 REF 0.700 REF
S 0.079 0.095 2.00 2.40
B 0.045 0.053 1.15 1.35
C 0.032 0.040 0.80 1.00
D 0.012 0.016 0.30 0.40
G 0.047 0.055 1.20 1.40
H 0.000 0.004 0.00 0.10
J 0.004 0.010 0.10 0.25
CN
AL
D
G
SB
H
J
K
3
12
0.05 (0.002)
SC
-
70 / SOT
-
323