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-2 ST-2-120 Bel Signal Transformer 1: $11.71 196In Stock	Mfr. Part No. ST-2-120 Mouser Part No 530-ST-2-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	196In Stock	$11.71 $9.96 $9.55 $9.26 View $7.79 $7.76 $7.69 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	120 V CT/60 V	1.1 VA	10 mA/20 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-6 ST-6-36 Bel Signal Transformer 1: $22.21 95In Stock	Mfr. Part No. ST-6-36 Mouser Part No 530-ST-6-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	95In Stock	$22.21 $20.03 $19.18 $17.60 View $16.90 $16.42 $16.12 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	20 VA	550 mA/1.1 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-6-20 Bel Signal Transformer 1: $21.32 178In Stock	Mfr. Part No. ST-6-20 Mouser Part No 530-ST-6-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	178In Stock	$21.32 $19.20 $18.40 $16.90 View $16.41 $15.76 $15.46 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	20 VA	1 A/2 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-7-24 Bel Signal Transformer 1: $25.45 78In Stock	Mfr. Part No. ST-7-24 Mouser Part No 530-ST-7-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	78In Stock	$25.45 $22.92 $21.89 $20.34 View $18.75 $18.40 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	36 VA	1.5 A/3 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-3 ST-3-20 Bel Signal Transformer 1: $11.89 59In Stock	Mfr. Part No. ST-3-20 Mouser Part No 530-ST-3-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	59In Stock	$11.89 $10.11 $9.69 $9.40 View $7.91 $7.89 $7.79	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	2.4 VA	120 mA/240 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-5 ST-5-12 Bel Signal Transformer 1: $18.60 37In Stock	Mfr. Part No. ST-5-12 Mouser Part No 530-ST-5-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	37In Stock	$18.60 $16.47 $13.99 $13.34 View $13.18 $13.04	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	12 VA	1 A/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-5-56 Bel Signal Transformer 1: $23.93 75In Stock	Mfr. Part No. ST-5-56 Mouser Part No 530-ST-5-56	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	75In Stock	$23.93 $21.56 $18.47 $18.45 View $18.39 $18.36 $18.33 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	56 V CT/28 V	12 VA	220 mA/440 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-7 ST-7-28 Bel Signal Transformer 1: $26.76 48In Stock	Mfr. Part No. ST-7-28 Mouser Part No 530-ST-7-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	48In Stock	$26.76 $23.33 $22.60 $19.61 View $19.26 $18.70 $18.33 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	36 VA	1.3 A/2.6 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-3 ST-3-48 Bel Signal Transformer 1: $17.67 98In Stock	Mfr. Part No. ST-3-48 Mouser Part No 530-ST-3-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	98In Stock	$17.67 $14.85 $14.25 $13.99 $12.33	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	2.4 VA	50 mA/100 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-5 ST-5-36 Bel Signal Transformer 1: $15.29 97In Stock	Mfr. Part No. ST-5-36 Mouser Part No 530-ST-5-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	97In Stock	$15.29 $13.77 $12.55 $12.11 View $11.73 $11.18 $10.85 $10.68 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	12 VA	350 mA/700 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount HF POE SMT XFMR EP10 8PIN 7W ST-2-10 Bel Signal Transformer 1: $17.48 64In Stock	Mfr. Part No. ST-2-10 Mouser Part No 530-ST-2-10	Bel Signal Transformer	Power Transformers - Board Mount HF POE SMT XFMR EP10 8PIN 7W Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	64In Stock	$17.48 $15.75 $15.39 $14.05 $12.19	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	10 V CT/5 V	1.1 VA	110 mA/220 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-3-10 Bel Signal Transformer 1: $12.83 197In Stock	Mfr. Part No. ST-3-10 Mouser Part No 530-ST-3-10	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	197In Stock	$12.83 $11.46 $10.99 $10.64 View $10.30 $9.83 $8.83 $8.65 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	10 V CT/5 V	2.4 VA	250 mA/500 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-3-12 Bel Signal Transformer 1: $13.10 250In Stock	Mfr. Part No. ST-3-12 Mouser Part No 530-ST-3-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	250In Stock	$13.10 $12.00 $11.28 $10.90 View $10.87 $9.76 $9.61	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	2.4 VA	200 mA/400 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-6 ST-6-16 Bel Signal Transformer 1: $22.54 90In Stock	Mfr. Part No. ST-6-16 Mouser Part No 530-ST-6-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	90In Stock	$22.54 $20.29 $19.46 $18.83 View $17.33 $16.69 $16.44 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	16 V CT/8 V	20 VA	1.25 A/2.5 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-2 ST-2-12 Bel Signal Transformer 1: $14.39 43In Stock	Mfr. Part No. ST-2-12 Mouser Part No 530-ST-2-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	43In Stock	$14.39 $13.04 $12.51 $12.12 View $11.26 $10.78 $10.44 $9.43 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	1.1 VA	90 mA/180 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-2-24 Bel Signal Transformer 1: $18.72 18In Stock	Mfr. Part No. ST-2-24 Mouser Part No 530-ST-2-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	18In Stock	$18.72 $18.51 $12.27 $12.25 $12.23	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	1.1 VA	45 mA/90 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-2-28 Bel Signal Transformer 1: $11.40 183In Stock	Mfr. Part No. ST-2-28 Mouser Part No 530-ST-2-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	183In Stock	$11.40 $10.29 $9.87 $9.40 View $9.11 $8.58 $7.78 $7.62	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	1.1 VA	40 mA/80 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-2-48 Bel Signal Transformer 1: $17.20 28In Stock	Mfr. Part No. ST-2-48 Mouser Part No 530-ST-2-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	28In Stock	$17.20 $15.74 $15.46 $13.65 $11.91	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	1.1 VA	23 mA/46 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-3-16 Bel Signal Transformer 1: $10.30 173In Stock	Mfr. Part No. ST-3-16 Mouser Part No 530-ST-3-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	173In Stock	$10.30 $9.44 $8.89 $8.56 View $8.29 $8.04 $7.48 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	16 V CT/8 V	2.4 VA	150 mA/300 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-3-24 Bel Signal Transformer 1: $10.11 132In Stock	Mfr. Part No. ST-3-24 Mouser Part No 530-ST-3-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	132In Stock	$10.11 $9.26 $9.25 $8.97 View $8.69 $8.41	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	2.4 VA	100 mA/200 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-3-28 Bel Signal Transformer 1: $10.97 67In Stock	Mfr. Part No. ST-3-28 Mouser Part No 530-ST-3-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	67In Stock	$10.97 $9.25 $8.52 $8.34 View $8.04 $7.58 $7.34	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	2.4 VA	85 mA/170 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-3-36 Bel Signal Transformer 1: $11.56 128In Stock	Mfr. Part No. ST-3-36 Mouser Part No 530-ST-3-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	128In Stock	$11.56 $10.27 $9.85 $9.54 View $9.23 $8.27 $8.04 $7.84 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	2.4 VA	65 mA/130 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-3-56 Bel Signal Transformer 1: $11.71 14In Stock	Mfr. Part No. ST-3-56 Mouser Part No 530-ST-3-56	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	14In Stock	$11.71 $10.89 $10.68 $9.72 $8.26	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	56 V CT/28 V	2.4 VA	45 mA/90 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-4 ST-4-16 Bel Signal Transformer 1: $12.43 54In Stock 200Expected 2026/10/23	Mfr. Part No. ST-4-16 Mouser Part No 530-ST-4-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	54In Stock 200Expected 2026/10/23	$12.43 $11.40 $10.71 $10.32 View $10.09 $9.92 $8.65	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	16 V CT/8 V	6 VA	400 mA/800 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-4-20 Bel Signal Transformer 1: $12.51 148In Stock	Mfr. Part No. ST-4-20 Mouser Part No 530-ST-4-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	148In Stock	$12.51 $11.47 $10.89 $10.87 View $10.07 $9.61 $9.33 $9.09 Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	6 VA	300 mA/600 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST