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Miniature Surface Mount
Transformers

  • Designed specifically for use with Maxim RS-232 / RS-485 interface ICs
  • Also specified by Linear Technology and Sipex
  • Suitable for gate drive and other power applications
  • 1500 Vrms isolation between windings
  • Miniature surface mount package
  • Stainless steel cover serves as an excellent pick and place surface
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations.

SPECIFICATIONS

  Chipset
Linear
LT1952
Linear
LTC3900
Maxim
250/251
Maxim
253/845
Maxim
3535E
Sipex
SP3222
Sipex
SP3232
 Q4470-CL      
 S5394-CL             
 U6982-CL      
 T6437-DL            
 S5499-DL            
 T6650-DL             

Part number1
Click to get parts
Pri / sec
voltage
Inductance
min (µH)
Volt-time
Product2
typ (Vµsec)
DCR
max3
(Ohms)
Isolation
pri-sec
(Vrms)
Pri / sec
capacitance
typ (pF)4
Size Power
(W)5
Pri : sec
Turns
ratio6
Q4470-CL_ 5 V to
5 V
400 (1-3) 27 (1-3) 0.950
(1-3)
1.25
(6-4)
1500
(1-4)
0.87 C 0.25 1 CT : 1.3 CT
S5394-CL_ 5 V to
10 V
400 (1-3) 27 (1-3) 0.950
(1-3, 6-4)
1500
(1-4)
0.92 C 0.25 1 CT : 1
U6982-CL_ 3.3 V to 
5 V
59 (1-3) 22 (1-3) 0.700
(1-3)
1.800
(6-4)
1500
(1-4)
0.93 C 0.75 1 CT : 2.1 CT
T6437-DL_ 5 V to
5 V
1000 (1-4) 134 (1-4) 1.010
(1-2, 3-4)
1.955
(8-5)
1500
(1,3-8)
1.88 D 1.5 1 CT : 1
S5499-DL_ 5 V to
24 V
40 (2-1) 48 (1-4) 0.540
(2-1, 4-3)
4.28
(5-6, 7-8)
1500
(1,3-8,6)
1.59 D 1.0 1 CT : 5 CT
T6650-DL_ 5 V to
24 V
176 (2-3) 48 (2-3) 1.015
(2-3)
8.250
(7-6)
1500
(3-6)
1.25 D 1.0 1 : 5
1 When ordering, please specify packaging code: e.g. Q4470-CLD
Packaging: D = 13" reel, machine-ready 
EIA-481 embossed plastic tape (C size: 1000 parts per full reel; D size: 500 parts per full reel).
B = Less than full reel
In tape, not machine ready. To have a leader and trailer added ($25 charge), use code letter D instead.
2 Volt-time product is based on core area, number of primary turns and 4800 Gauss flux density.
3 DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Capacitance measured from full primary to full secondary at 200 kHz.
5 Calculated output power is based on 150 kHz operating frequency. Power rating varies depending on application.
6 CT indicates center tap
7 Ambient temperature range: −40°C to +85°C
8 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
9 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
10 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: April 11, 2017