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Specifications
Secondary Winding:
2
Isolation Voltage(Vrms):
2.5kV
Primary Winding(s):
1
Secondary Side Voltage:
14V;28V
Output Current:
170mA;85mA
Primary Side Voltage:
115V
Mfr. Part #:
ST-3-28
Package:
Through Hole-6P,34.9x28.6mm
Key Attributes
Model Number:
ST-3-28
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 dual-cavity platform that provides superior isolation and low capacitive coupling. These transformers feature rigid pin construction for easier board insertion and enhanced reliability. They are suitable for a wide range of power applications, from 1.1 VA to 36 VA, and are built with a Class F (155C) insulation system. The series offers both single and dual primary configurations and can be wired in series or parallel for secondary outputs. Electrostatic shielding is not required due to the split bobbin construction.
Product Attributes
- Brand: Signal (Bel Fuse)
- Series: ST / DST Series Split/Tran
- Type: Specialty Purpose & Class 2 Transformers
- Construction: Split Bobbin
- Insulation System: Class F, 155 C
- Certifications: UL 1446, UL Recognized 506 / UL 5085-1, 2, CSA certified to C22.2 #66.1, cCSAus certified to C22.2 #66.3 / UL 5085-3
- Compliance: RoHS Compliant
- 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) | Mounting Configuration | Weight (lbs/kg) |
|---|---|---|---|---|---|---|---|---|
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.17 (0.08) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.25 (0.11) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.44 (0.20) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.70 (0.32) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 0.80 (0.36) |
| 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 | 6 Pin (ST) / 8 Pin (DST) | 1.1 (0.50) |
| Size (VA) | Dimensions L x W x H (inches/mm) | Mounting Hole Centers (inches/mm) | Optional Mounting Screw & Nut |
|---|---|---|---|
| 1.1 | 1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6) | - | - |
| 2.4 | 1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8) | - | - |
| 6 | 1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3) | 1.06 (26.9) | Nylon 4-40 x 1.37 (4-40 x 34.9) |
| 12 | 1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9) | 1.25 (31.8) | Nylon 4-40 x 1.37 (4-40 x 34.9) |
| 20 | 2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9) | 1.50 (38.1) | Nylon 4-40 x 1.37 (4-40 x 34.9) |
| 36 | 2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4) | 1.85 (47.0) | Available: ST-MS (screw), ST-MN (nut). Size 7 has 4 mounting holes on 2.18 x 1.75 centers for #6 screws. |
| Recommended Secondary Fuse Values (Amps) |
|---|
| (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 |
2411272143_Bel-Fuse-ST-3-28_C17593042.pdf
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