Power Transformers - Board Mount

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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 (IDR) 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-5 ST-5-16 Bel Signal Transformer 1: Rp290.784 122In Stock	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	122In Stock	Rp290.784 Rp237.581 Rp230.976 Rp225.105 View Rp195.385 Rp184.744 Rp181.625 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-5 ST-5-20 Bel Signal Transformer 1: Rp287.482 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	Rp287.482 Rp262.898 Rp246.754 Rp237.764 View Rp229.325 Rp204.008 Rp198.137 Rp196.486 Quote	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: Rp299.957 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	Rp299.957 Rp268.585 Rp259.046 Rp224.922 View Rp218.684 Rp203.824 Rp201.072	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: Rp448.743 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	Rp448.743 Rp416.087 Rp353.527 Rp338.851 View Rp336.466 Rp329.127 Rp324.908 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: Rp448.560 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	Rp448.560 Rp384.349 Rp368.388 Rp323.073 View Rp315.551 Rp302.709 Rp294.270 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: Rp466.539 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	Rp466.539 Rp437.369 Rp303.443 Rp298.856 View Rp295.371 Quote	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: Rp571.845 17In 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	17In Stock	Rp571.845 Rp548.912 Rp406.547 Rp356.279 View Rp352.243 Rp348.207 Rp343.988 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: Rp386.183 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	Rp386.183 Rp374.992 Rp374.809 Rp347.473 View Rp335.732 Rp324.908 Rp320.321 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: Rp579.183 9In 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	9In Stock	Rp579.183 Rp556.251 Rp410.950 Rp358.848 View Rp355.179 Rp350.776 Rp346.189 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-3 ST-3-24 Bel Signal Transformer 1: Rp185.478 200Expected 18/12/2026	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	200Expected 18/12/2026	Rp185.478 Rp169.701 Rp169.517 Rp166.582 View Rp161.995 Rp156.858	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-4 ST-4-12 Bel Signal Transformer 1: Rp255.927 200On Order	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	200On Order	Rp255.927 Rp232.627 Rp216.116 Rp200.522 View Rp173.920 Rp165.297 Rp158.509 Rp154.657	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-3 ST-3-36 Bel Signal Transformer 1: Rp212.080 128Expected 20/11/2026	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	128Expected 20/11/2026	Rp212.080 Rp188.413 Rp180.708 Rp175.021 View Rp169.334 Rp148.970 Rp144.750 Rp141.264	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-4 ST-4-36 Bel Signal Transformer 1: Rp256.844 87Expected 09/12/2026	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	87Expected 09/12/2026	Rp256.844 Rp235.379 Rp222.904 Rp222.720 View Rp218.501 Rp180.158 Rp170.618 Rp167.682 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-2 ST-2-16 Bel Signal Transformer 1: Rp246.020 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	Rp246.020 Rp221.987 Rp212.814 Rp206.209 View Rp191.899 Rp183.093 Rp178.140 Rp154.840 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: Rp214.832 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	Rp214.832 Rp198.687 Rp142.548 Rp140.163 View Rp138.329 Quote	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: Rp243.451 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	Rp243.451 Rp225.289 Rp160.528 Rp158.693 View Rp156.491 Rp154.657 Quote	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: Rp281.795 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	Rp281.795 Rp251.891 Rp247.304 Rp220.702 Rp187.496	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 500: Rp130.257 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	Rp130.257 Rp127.138 Quote Quote	Min.: 500 Mult.: 100	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: Rp259.046 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	Rp259.046 Rp231.893 Rp227.490 Rp184.377 View Rp179.791 Rp178.507 Rp175.204 Rp173.003	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: Rp315.551 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	Rp315.551 Rp288.583 Rp283.446 Rp228.958 View Rp224.005 Rp219.785 Rp218.684	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: Rp287.849 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	Rp287.849 Rp257.578 Rp252.624 Rp204.741 View Rp199.788 Rp195.935 Rp192.450 Rp189.881	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 100: Rp260.513 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	Rp260.513 Rp254.642 Rp249.873 View Quote	Min.: 100 Mult.: 50	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: Rp423.976 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	Rp423.976 Rp404.162 Rp343.437 Rp336.099 View Rp326.008 Rp320.688 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: Rp450.761 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	Rp450.761 Rp430.030 Rp351.326 Rp344.538 View Rp340.869 Rp333.530 Rp329.311 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: Rp275.373 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	Rp275.373 Rp239.966 Rp217.033 Rp209.144 View Rp202.907 Rp193.550 Rp179.791 Rp176.305 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