3D Model Datasheet

ST458RFW Series

Wideband Transformers for Critical Applications

ST458RFW Series offers 250 mA max current rating.

Miniature wideband transformer: 4 mm square 3 mm high.
300 V interwinding isolation, 1/4 Watt RF input power.
Tin-silver-copper over silver-platinum-glass frit termination. Other terminations available at additional cost.

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Specifications

Electrical specifications at 25°C. Measurements are referenced to 50 Ohms.

Part number 1	L min per winding (µH) 2		DCR max (mΩ) 3		Imp. ratio pri:sec 4	Current rating (mA)	Insertion loss (db)	DC imbalance 5	Bandwidth (MHz)	Isolation Voltage (Vrms)	Schematic
Part number 1	Pri	Sec	Pri	Sec	Imp. ratio pri:sec 4	Current rating (mA)	Insertion loss (db)	DC imbalance 5	Bandwidth (MHz)	Isolation Voltage (Vrms)	Schematic
ST458RFW01A1LZ	10	10	120	120	1 : 1	250	0.4	-	0.4 — 600	300	A
ST458RFW01B1LZ	9.5	9.5	75.0	75.0	1 : 1	250	0.58	36.0	0.25 — 750	300	B
ST458RFW02B1LZ	10	20	120	150	1 : 2	250	0.5	8.5	0.2 — 500	300	B
ST458RFW03B1LZ	9.0	27	100	150	1 : 3	250	0.6	8.5	0.3 — 900	300	B
ST458RFW04B1LZ	9.0	36	55.0	120	1 : 4	250	1	30.0	0.25 — 750	300	B
ST458RFW04B2LZ	2.0	8.0	50.0	100	1 : 4	250	2	15.0	1.5 — 1200	300	B
ST458RFW04B3LZ	5.0	20	80.0	120	1 : 4	250	0.9	10.0	0.5 — 1000	300	B
ST458RFW04B4LZ	9.0	36	80.0	200	1 : 4	250	0.65	7.5	0.3 — 700	300	B
ST458RFW04C1LZ	9.0	36	60.0	120	1 : 4	250	1	30.0	0.25 — 800	300	C
ST458RFW08B1LZ	22	176	120	310	1 : 8	250	0.6	17.0	0.15 — 600	300	D
ST458RFW09B1LZ	9.0	81	80.0	230	1 : 9	250	0.54	5.0	0.3 — 500	300	B
ST458RFW16B1LZ	5.0	80	80.0	230	1 : 16	250	0.8	5.0	0.6 — 300	300	B

Notes

When ordering, please specify termination and testing codes: e.g. ST458RFW04C1LZ.
Inductance measured at 100 kHz, 0.1 V, 0 Adc on an Agilent/HP 4192 or equivalent.
DCR measured on a micro-ohmmeter.
Impedance ratio is for the full primary winding to the full secondary winding.
DC imbalance is the maximum difference in current measured at pins 4 and 6 with the source at pin 5. Inductance drop is 15% at maximum imbalance.

Termination:

L = Tin-silver-copper (95.5/4/0.5) over silver-platinum-glass frit.
S = Tin-lead (63/37). (Special order,added cost)

Testing:

Z = Unscreened
H = Group A screening per Coilcraft CP-SA-10001
All screening performed to the document’s latest revision
Custom screening also available

Environmental

Ambient temperature range:

–40°C to +85°C

Storage temperature range:

Component: –55°C to +95°C
Tape and reel packaging: –55°C to +80°C

Maximum part temperature:

+95°C (ambient + temp rise)

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations