Switchmode Custom Transformer

West Coast Magnetics' 405 series transformers have been designed specifically for switch mode power applications. The isolation characteristics of this transformer geometry make it an ideal choice for medical applications where safety agency requirements must be met. This transformer series also features high power handling capability in a compact package.

Download Product Sheet PDF

Request price and delivery information.

Design Constants

Size Code	Ae (cm2)	le (cm)	Ve (cm3)	Wa (cm2)	WaAc (mm4)	Window Width (cm)	Window Width (in)	Window Height (cm)	Window Height (in)	Mean Length per Turn (ft)	Rth (deg C/Watt)
405-2016	0.62	3.74	2.31	0.26	1587	0.798	0.314	0.318	0.125	0.144	34
405-2020	0.62	4.54	2.79	0.38	2381	1.194	0.470	0.318	0.125	0.144	31
405-2620	1.19	4.63	5.49	0.33	3951	0.899	0.354	0.370	0.146	0.184	21
405-2625	1.18	5.55	6.53	0.50	5924	1.359	0.535	0.370	0.146	0.184	20
405-3220	1.70	5.55	9.42	0.47	7990	0.879	0.346	0.535	0.211	0.220	16
405-3230	1.61	7.46	11.97	0.99	16003	1.859	0.732	0.535	0.211	0.220	14
405-3535	1.96	8.79	17.26	1.59	31164	2.230	0.878	0.715	0.282	0.247	12
405-4040	2.01	10.19	20.45	2.49	50049	4.966	1.955	0.930	0.366	0.275	11

output frequency

Output Power vs Frequency of Operation (Watts)

Size Code	25 kHz	50 kHz	100 kHz	250 kHz	500 kHz
405-2016	23	29	36	56	63
405-2020	30	40	54	83	95
405-2620	44	58	79	121	139
405-2625	60	80	107	152	181
405-3220	81	108	144	205	244
405-3230	168	223	296	419	503
405-3535	298	396	527	745	893
405-4040	400	532	710	996	1190

schematics

Part Views and Dimensions

click image to enlarge

* square pin

	L		W		H		l	d
	inches	mm	inches	mm	inches	mm	mm	mm
405-2016	0.92	23.2	0.92	23.2	0.70	17.8	7.0	0.60
405-2020	0.92	23.2	0.92	23.2	0.85	21.6	7.0	0.60
405-2620	1.10	27.9	1.17	29.7	0.91	23.1	7.0	0.85
405-2625	1.10	27.9	1.17	29.7	1.02	25.9	7.0	0.95
405-3220	1.34	34.0	1.35	34.3	0.95	24.1	7.0	0.95
405-3230	1.34	34.0	1.35	34.3	1.34	34.0	7.0	0.95
405-3535	1.47	37.3	1.55	39.4	1.52	38.6	7.0	0.95
405-4040	1.70	43.2	1.68	42.7	1.73	43.9	7.0	0.95

Note:

Tolerance on pin lengths is ± 0.7mm
Tolerance on pin diameter is ± 0.06mm

pcb layouts

click image to enlarge