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Specifications
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
Mfr. Part #:
ST-3-20
Package:
Through Hole-6P,34.9x28.6mm
Key Attributes
Model Number:
ST-3-20
Product Description
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
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