Power Transformers - Board Mount – Mouser South Africa

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ST Class 2 Transformers

Signal Transformer / Bel ST Class 2 Transformers provide superior isolation and low capacitive coupling. These split-bobbin, low-power transformers feature a power rating of 1.1VA to 36VA and are available in 60 standard configurations. Signal Transformer / Bel ST Class 2 Transformers are recognized to UL 506 and meet the specifications for UL 1446 (E66312).

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Primary Voltage Rating	Secondary Voltage Rating	Power Rating	Secondary Current Rating	Mounting Style	Primary Winding	Secondary Winding	Length	Width	Height	Series
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-24 Bel Signal Transformer 1: $11.48 113In Stock 500Expected 2026/11/20	Mfr. Part No. ST-4-24 Mouser Part No 530-ST-4-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	113In Stock 500Expected 2026/11/20	$11.48 $10.54 $9.90 $9.54 View $9.25 $8.98 $8.94 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	6 VA	250 mA/500 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-28 Bel Signal Transformer 1: $14.00 77In Stock	Mfr. Part No. ST-4-28 Mouser Part No 530-ST-4-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	77In Stock	$14.00 $12.83 $12.06 $11.62 View $11.33 $11.05 $10.27 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	6 VA	200 mA/400 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-36 Bel Signal Transformer 1: $14.00 60In Stock 100Expected 2026/12/09	Mfr. Part No. ST-4-36 Mouser Part No 530-ST-4-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	60In Stock 100Expected 2026/12/09	$14.00 $12.83 $12.06 $11.62 View $11.26 $10.75 $10.42 $10.27 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	6 VA	170 mA/340 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-20 Bel Signal Transformer 1: $15.68 43In Stock	Mfr. Part No. ST-5-20 Mouser Part No 530-ST-5-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	43In Stock	$15.68 $14.33 $13.46 $12.97 View $12.50 $11.98 $11.63 $11.57	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	12 VA	600 mA/1.2 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-28 Bel Signal Transformer 1: $16.35 19In Stock	Mfr. Part No. ST-5-28 Mouser Part No 530-ST-5-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	19In Stock	$16.35 $14.64 $14.12 $12.26 View $11.92 $11.26 $11.25 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	12 VA	420 mA/840 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-48 Bel Signal Transformer 1: $24.47 26In Stock	Mfr. Part No. ST-5-48 Mouser Part No 530-ST-5-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	26In Stock	$24.47 $22.68 $19.27 $18.47 View $18.31 $18.13 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	12 VA	250 mA/500 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 ST-6-24 Bel Signal Transformer 1: $24.46 5In Stock	Mfr. Part No. ST-6-24 Mouser Part No 530-ST-6-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	5In Stock	$24.46 $20.96 $20.09 $17.61 View $17.12 $16.64 $16.29 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	20 VA	800 mA/1.6 A	Through Hole	Single Primary Winding	Dual Secondary Winding	57.2 mm	47.8 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 ST-6-28 Bel Signal Transformer 1: $25.43 14In Stock	Mfr. Part No. ST-6-28 Mouser Part No 530-ST-6-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	14In Stock	$25.43 $23.84 $16.54 $16.38	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	20 VA	700 mA/1.4 A	Through Hole	Single Primary Winding	Dual Secondary Winding	57.2 mm	47.8 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 ST-7-12 Bel Signal Transformer 1: $31.18 18In Stock	Mfr. Part No. ST-7-12 Mouser Part No 530-ST-7-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	18In Stock	$31.18 $29.92 $22.17 $19.38 View $19.27 $19.08 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	36 VA	2.85 A/5.7 A	Through Hole	Single Primary Winding	Dual Secondary Winding	66.7 mm	55.5 mm	40.4 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 ST-7-20 Bel Signal Transformer 1: $21.05 40In Stock	Mfr. Part No. ST-7-20 Mouser Part No 530-ST-7-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	40In Stock	$21.05 $20.45 $20.43 $18.86 View $18.71 $18.53 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	36 VA	1.8 A/3.6 A	Through Hole	Single Primary Winding	Dual Secondary Winding	66.7 mm	55.5 mm	40.4 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 ST-7-48 Bel Signal Transformer 1: $31.58 10In Stock	Mfr. Part No. ST-7-48 Mouser Part No 530-ST-7-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	10In Stock	$31.58 $30.33 $22.40 $19.53 View $19.40 $19.21 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	36 VA	750 mA/1.5 A	Through Hole	Single Primary Winding	Dual Secondary Winding	66.7 mm	55.5 mm	40.4 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-12 Bel Signal Transformer 1: $13.96 200Expected 2026/11/06	Mfr. Part No. ST-4-12 Mouser Part No 530-ST-4-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	200Expected 2026/11/06	$13.96 $12.68 $11.78 $10.93 View $9.48 $9.01 $8.86 $8.66	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	6 VA	500 mA/1 A	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-16 Bel Signal Transformer 1: $15.85 100Expected 2026/10/09	Mfr. Part No. ST-5-16 Mouser Part No 530-ST-5-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	100Expected 2026/10/09	$15.85 $13.89 $11.57 $11.25 View $10.94 $10.54 $10.26 $10.13 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	16 V CT/8 V	12 VA	800 mA/1.6 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-16 Bel Signal Transformer 1: $13.41 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-16 Mouser Part No 530-ST-2-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$13.41 $12.11 $11.61 $11.25 View $10.47 $9.98 $9.71 $8.64 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	16 V CT/8 V	1.1 VA	70 mA/140 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-20 Bel Signal Transformer 1: $11.71 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-20 Mouser Part No 530-ST-2-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$11.71 $10.83 $7.79 $7.76 $7.68	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	1.1 VA	55 mA/110 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-36 Bel Signal Transformer 1: $13.27 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-36 Mouser Part No 530-ST-2-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$13.27 $12.28 $8.76 $8.48 View $8.34 $8.21	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	1.1 VA	30 mA/60 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-56 Bel Signal Transformer 1: $15.36 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-56 Mouser Part No 530-ST-2-56	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$15.36 $13.74 $13.48 $12.12 $10.35	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	56 V CT/28 V	1.1 VA	20 mA/40 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 ST-3-120 Bel Signal Transformer 1: $10.97 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-3-120 Mouser Part No 530-ST-3-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$10.97 $9.47 $9.08 $8.91 View $8.90 $7.33 $7.14 $6.99	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	120 V CT/60 V	2.4 VA	20 mA/40 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	30.8 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 ST-4-10 Bel Signal Transformer 1: $14.12 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-10 Mouser Part No 530-ST-4-10	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$14.12 $12.64 $12.40 $10.05 View $9.79 $9.59 $9.46 $9.32 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	10 V CT/5 V	6 VA	600 mA/1.2 A	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-120 Bel Signal Transformer 1: $17.20 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-120 Mouser Part No 530-ST-4-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$17.20 $15.74 $15.46 $12.47 View $12.30 $12.19 $12.18	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	120 V CT/60 V	6 VA	50 mA/100 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-48 Bel Signal Transformer 1: $15.69 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-48 Mouser Part No 530-ST-4-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$15.69 $14.04 $13.77 $11.16 View $10.90 $10.78 $10.68	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	6 VA	125 mA/250 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-56 Bel Signal Transformer 1: $20.42 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-56 Mouser Part No 530-ST-4-56	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$20.42 $17.97 $17.63 $14.24 View $14.18 $13.99 $13.86 $13.85	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	56 V CT/28 V	6 VA	110 mA/220 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-5-10 Bel Signal Transformer 1: $23.11 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-5-10 Mouser Part No 530-ST-5-10	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$23.11 $22.21 $18.88 $18.53 View $18.25 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	10 V CT/5 V	12 VA	1.2 A/2.4 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-120 Bel Signal Transformer 1: $24.57 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-5-120 Mouser Part No 530-ST-5-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$24.57 $23.45 $19.15 $18.76 View $18.57 $18.40 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	120 V CT/60 V	12 VA	100 mA/200 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-24 Bel Signal Transformer 1: $15.01 Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-5-24 Mouser Part No 530-ST-5-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	$15.01 $13.15 $11.83 $11.40 View $11.06 $10.55 $10.23 $10.08 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	12 VA	500 mA/1 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST