© Coilcraft, Inc. 2009
Specifications subject to change without notice.
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Document 183-1
Document 183-1
Revised 10/31/08
MagneticsforLM258XFlybackRegulator
These standard flyback regulator transformers are de-
signed for use with National Semiconductor LM2585,
LM2586, LM2587 and LM2588 SIMPLE SWITCHER®
switching regulators.
Volt-time
Input
Inductance Inductance product
Leakage
Ref.
Part
voltage
at 0 Adc
at I pk
max
Inductance1
DCR (Ohms)
Turns ratio
Ipk2
number
number
(V)
±15% (µH)
min (µH)
(Vµsec)
max (µH)
pri
sec
pri : sec
Output
(A)
T1 (SM)
Q4435-BL
4 – 6
22
19.0
166.5
0.7
0.020
0.025
1 : 1
5 V, 1.6 A
4.85
T1 (PC)
Q4434-BL
4 – 6
22
19.8
162.0
2.0
0.028
0.028
1 : 1
5 V, 1.6 A
5.0
T2 (SM)
Q4436-BL
4 – 6
22
17.6
166.5
0.5
0.025
0.23 (10-11)
1 : 2.5
12 V, 0.35 A
5.0
0.25 (9-8)
1 : 2.5
12 V, 0.35 A
T2 (PC)
Q4337-BL
4 – 6
22
19.8
162.0
2.0
0.030
0.32 (8-7)
1 : 2.5
12 V, 0.35 A
5.0
0.32 (6-5)
1 : 2.5
12 V, 0.35 A
T3 (PC)
Q4343-BL 18 – 36
85
76.5
364.5
3.5
0.150
0.011 (10-9)
1 : 0.8
12 V, 1.4 A
3.0
0.011 (7-6)
1 : 0.8
12 V, 1.4 A
T4 (PC)
Q4344-BL 18 – 36
85
76.5
364.5
3.5
0.145
0.20 (10-9)
1 : 0.8
12 V, 0.75 A
3.0
0.20 (7-6)
1 : 0.8
12 V, 0.75 A
0.03 (4-5)
1 : 0.35
5 V, 3.0 A
T5 (SM)
Q4437-BL 18 – 36
55
47.3
299.7
2.0
0.110
0.035 (10-11)
1 : 0.5
5 V, 1.8 A
3.0
0.30 (9-8)
1 : 1.167
12 V, 0.25 A
0.32 (4-5)
1 : 1.167
12 V, 0.25 A
T5 (PC)
Q4338-BL 18 – 36
66
59.4
499.5
3.5
0.090
0.039 (8-7)
1 : 0.5
5 V, 1.8 A
3.0
0.58 (6-5)
1 : 1.167
12 V, 0.25 A
0.60 (3-4)
1 : 1.167
12 V, 0.25 A
T6 (SM)
Q4438-BL 18 – 36
65
57.0
299.7
3.0
0.065
0.15 (10-11)
1 : 1.2
12 V, 0.63 A
3.0
0.15 (9-8)
1 : 1.2
12 V, 0.63 A
T6 (PC)
Q4339-BL 18 – 36
66
59.4
499.5
3.0
0.090
0.20 (8-7)
1 : 1.2
12 V, 0.63 A
3.0
0.24 (5-6)
1 : 1.2
12 V, 0.63 A
T7 (SM)
S6057-AL
4 – 6
47
40.0
233.1
2.0
0.065
0.065
1 : 1
5 V, 0.9 A
3.0
T7 (PC)
S6000-AL
4 – 6
47
40.0
212.6
2.0
0.065
0.042
1 : 1
5 V, 0.9 A
3.0
1. Leakage inductance measured across the primary at 0.10 Vrms, 100 kHz.
2. DC current at which the primary inductance is measured.
3. Electrical specifications at 25° C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
They are available in surface mount and through hole
configurations. All feature 500 V isolation between wind-
ings and a variety of available turns ratios.
Core material Ferrite
Ambient temperature –40°C to +85°C
Weight
Q4337-BL:
11.4 g
Q4338-BL:
11.5 g
Q4339-BL:
11.6 g
Q4343-BL:
25.1 g
Q4344-BL:
23.1 g
Q4434-BL:
11.5 g
Storage temperature Component: –40°C to +85°C.
Packaging: –40°C to +80°C
Resistance to soldering heat (SM parts) Max three 40 second
reflows at +260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Mean Time Between Failures (MTBF) 26,315,789 hours
PCB washing Only pure water or alcohol recommended
Q4435-BL:
9.0 g
Q4436-BL:
8.7 g
Q4437-BL:
8.2 g
Q4438-BL:
8.6 g
S6000-AL:
10.6 g
S6057-AL:
8.2 g
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