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PCB Mount Split Bobbin Transformer Signal Transformer ST DST Series Including Bel Fuse ST-3-20 for Power

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PCB Mount Split Bobbin Transformer Signal Transformer ST DST Series Including Bel Fuse ST-3-20 for Power

Secondary Winding : 2

Isolation Voltage(Vrms) : 2.5kV

Primary Winding(s) : 1

Secondary Side Voltage : 10V;20V

Output Current : 240mA;120mA

Primary Side Voltage : 115V

Description : 115V Through Hole-6P,34.9x28.6mm Power Transformers RoHS

Mfr. Part # : ST-3-20

Model Number : ST-3-20

Package : Through Hole-6P,34.9x28.6mm

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Product Overview

The Signal ST / DST Series Split/Tran Specialty Purpose & Class 2 Transformers are designed for printed circuit board mounting. Utilizing a split bobbin with dual cavities, these transformers offer superior isolation and low capacitive coupling, eliminating the need for an electrostatic shield. Their rigid pin construction ensures easier board insertion and enhanced reliability. These transformers are suitable for a wide range of power applications from 1.1 VA to 36 VA and are available in single or dual primary configurations with various secondary voltage and current ratings.

Product Attributes

  • Brand: Signal Transformer
  • Series: ST / DST Series Split/Tran
  • Construction: Split Bobbin with Dual Cavity
  • Insulation System: Class F, 155 C
  • RoHS Compliant: Yes
  • Certifications: UL 1446 Class F, UL Recognized 506 / UL 5085-1, 2, CSA certified to C22.2 #66.1, cCSAus certified to C22.2 #66.3 / UL 5085-3, UL Recognized UL5085-3 Inherently Limited. Class 2 marking indicated by (*), (**), or (#).
  • Customization: Custom versions available upon request.

Technical Specifications

Model VA Rating Secondary RMS Rating (Series) Secondary RMS Rating (Parallel) Primary Voltage Frequency Dielectric Strength (Hipot) Dimensions (L x W x H) Weight Mounting Hardware
ST-2-10 / DST-2-10 1.1 10 VCT @ 0.11 A 5 V @ 0.22 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-10 / DST-3-10 2.4 10 VCT @ 0.25 A 5 V @ 0.5 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-10 / DST-4-10 6 10 VCT @ 0.6 A 5 V @ 1.2 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-10 / DST-5-10 12 10 VCT @ 1.2 A 5 V @ 2.4 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-10 / DST-6-10 20 10 VCT @ 2.0 A 5 V @ 4.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-10 / DST-7-10 36 10 VCT @ 3.6 A 5 V @ 7.2 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-12 / DST-2-12 1.1 12.6 VCT @ 0.09 A 6.3 V @ 0.18 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-12 / DST-3-12 2.4 12.6 VCT @ 0.2 A 6.3 V @ 0.4 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-12 / DST-4-12 6 12.6 VCT @ 0.5 A 6.3 V @ 1.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-12 / DST-5-12 12 12.6 VCT @ 1.0 A 6.3 V @ 2.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-12 / DST-6-12 20 12.6 VCT @ 1.6 A 6.3 V @ 3.2 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-12 / DST-7-12 36 12.6 VCT @ 2.85 A 6.3 V @ 5.7 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-16 / DST-2-16 1.1 16 VCT @ 0.07 A 8 V @ 0.14 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-16 / DST-3-16 2.4 16 VCT @ 0.15 A 8 V @ 0.3 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-16 / DST-4-16 6 16 VCT @ 0.4 A 8 V @ 0.8 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-16 / DST-5-16 12 16 VCT @ 0.8 A 8 V @ 1.6 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-16 / DST-6-16 20 16 VCT @ 1.25 A 8 V @ 2.5 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-16 / DST-7-16 36 16 VCT @ 2.25 A 8 V @ 4.5 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-20 / DST-2-20 1.1 20 VCT @ 0.055 A 10 V @ 0.11 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-20 / DST-3-20 2.4 20 VCT @ 0.12 A 10 V @ 0.24 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-20 / DST-4-20 6 20 VCT @ 0.3 A 10 V @ 0.6 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-20 / DST-5-20 12 20 VCT @ 0.6 A 10 V @ 1.2 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-20 / DST-6-20 20 20 VCT @ 1.0 A 10 V @ 2.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-20 / DST-7-20 36 20 VCT @ 1.8 A 10 V @ 3.6 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-24 / DST-2-24 1.1 24 VCT @ 0.045 A 12 V @ 0.09 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-24 / DST-3-24 2.4 24 VCT @ 0.1 A 12 V @ 0.2 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-24 / DST-4-24 6 24 VCT @ 0.25 A 12 V @ 0.5 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-24 / DST-5-24 12 24 VCT @ 0.5 A 12 V @ 1.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-24 / DST-6-24 20 24 VCT @ 0.8 A 12 V @ 1.6 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-24 / DST-7-24 36 24 VCT @ 1.5 A 12 V @ 3.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-28 / DST-2-28 1.1 28 VCT @ 0.04 A 14 V @ 0.08 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-28 / DST-3-28 2.4 28 VCT @ 0.085 A 14 V @ 0.17 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-28 / DST-4-28 6 28 VCT @ 0.2 A 14 V @ 0.4 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-28 / DST-5-28 12 28 VCT @ 0.42 A 14 V @ 0.84 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-28 / DST-6-28 20 28 VCT @ 0.7 A 14 V @ 1.4 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-28 / DST-7-28 36 28 VCT @ 1.3 A 14 V @ 2.6 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-36 / DST-2-36 1.1 36 VCT @ 0.03 A 18 V @ 0.06 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-36 / DST-3-36 2.4 36 VCT @ 0.065 A 18 V @ 0.13 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-36 / DST-4-36 6 36 VCT @ 0.17 A 18 V @ 0.34 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-36 / DST-5-36 12 36 VCT @ 0.35 A 18 V @ 0.7 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-36 / DST-6-36 20 36 VCT @ 0.55 A 18 V @ 1.1 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-36 / DST-7-36 36 36 VCT @ 1.0 A 18 V @ 2.0 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-48 / DST-2-48 1.1 48 VCT @ 0.023 A 24 V @ 0.046 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-48 / DST-3-48 2.4 48 VCT @ 0.05 A 24 V @ 0.1 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-48 / DST-4-48 6 48 VCT @ 0.125 A 24 V @ 0.25 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-48 / DST-5-48 12 48 VCT @ 0.25 A 24 V @ 0.5 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-48 / DST-6-48 20 48 VCT @ 0.4 A 24 V @ 0.8 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-48 / DST-7-48 36 48 VCT @ 0.75 A 24 V @ 1.5 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-56 / DST-2-56 1.1 56 VCT @ 0.02 A 28 V @ 0.04 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-56 / DST-3-56 2.4 56 VCT @ 0.045 A 28 V @ 0.09 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-56 / DST-4-56 6 56 VCT @ 0.11 A 28 V @ 0.22 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-56 / DST-5-56 12 56 VCT @ 0.22 A 28 V @ 0.44 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-56 / DST-6-56 20 56 VCT @ 0.35 A 28 V @ 0.7 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-56 / DST-7-56 36 56 VCT @ 0.65 A 28 V @ 1.3 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws
ST-2-120 / DST-2-120 1.1 120 VCT @ 0.01 A 60 V @ 0.02 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 0.97" (34.9 x 28.6 x 24.6 mm) 0.17 lbs (0.08 kg) N/A
ST-3-120 / DST-3-120 2.4 120 VCT @ 0.02 A 60 V @ 0.04 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.37" x 1.12" x 1.21" (34.9 x 28.6 x 30.8 mm) 0.25 lbs (0.11 kg) N/A
ST-4-120 / DST-4-120 6 120 VCT @ 0.05 A 60 V @ 0.1 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.62" x 1.31" x 1.31" (41.3 x 33.3 x 33.3 mm) 0.44 lbs (0.20 kg) Nylon 4-40 x 1.37"
ST-5-120 / DST-5-120 12 120 VCT @ 0.1 A 60 V @ 0.2 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 1.91" x 1.59" x 1.45" (48.4 x 40.4 x 36.9 mm) 0.70 lbs (0.32 kg) Nylon 4-40 x 1.37"
ST-6-120 / DST-6-120 20 120 VCT @ 0.16 A 60 V @ 0.32 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.25" x 1.88" x 1.45" (57.2 x 47.8 x 36.9 mm) 0.80 lbs (0.36 kg) Nylon 4-40 x 1.37"
ST-7-120 / DST-7-120 36 120 VCT @ 0.3 A 60 V @ 0.6 A 115 V / 115/230 V 50/60 Hz 2500 Vrms 2.62" x 2.18" x 1.59" (66.7 x 55.5 x 40.4 mm) 1.1 lbs (0.50 kg) 4 mounting holes for #6 screws

Recommended Secondary Fuse Values: (1) 0.125 A, (2) 0.15 A, (3) 0.25 A, (4) 0.3 A, (5) 0.375 A, (6) 0.4 A, (7) 0.5 A, (8) 0.6 A, (9) 0.75 A, (10) 1.0 A, (11) 1.5 A, (12) 2.0 A, (13) 3.0 A.

Mounting Hardware: Available from Signal, part numbers ST-MS (screw) and ST-MN (nut). See Accessories datasheet for mounting screw information.


2411272143_Bel-Fuse-ST-3-20_C17248689.pdf


Quality PCB Mount Split Bobbin Transformer Signal Transformer ST DST Series Including Bel Fuse ST-3-20 for Power for sale

PCB Mount Split Bobbin Transformer Signal Transformer ST DST Series Including Bel Fuse ST-3-20 for Power Images

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