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Specifications
Secondary Winding:
2
Isolation Voltage(Vrms):
2.5kV
Primary Winding(s):
2
Secondary Side Voltage:
14V;28V
Output Current:
400mA;200mA
Primary Side Voltage:
115V;230V
Mfr. Part #:
DST-4-28
Package:
Through Hole-8P,41.3x33.3mm
Key Attributes
Model Number:
DST-4-28
Product Description
Product Overview
The Signal ST / DST Series Split/Tran Specialty Purpose & Class 2 Transformers are designed for printed circuit board mounting, offering superior isolation and low capacitive coupling due to their dual cavity platform. Featuring rigid pin construction for enhanced board insertion reliability, these transformers are available in a range of power ratings from 1.1 VA to 36 VA. They are suitable for applications requiring high isolation and are UL and CSA certified, with RoHS compliance.
Product Attributes
- Brand: Signal Transformer (Bel Fuse)
- Series: ST / DST Series Split/Tran
- Construction: Split Bobbin, Dual Cavity Platform
- Pin Construction: Rigid
- Insulation System: Class F, 155 C
- Compliance: RoHS Compliant
- Agency Certifications:
- UL 1446 Class F insulation systems, File # E66312
- UL Recognized 506 / UL 5085-1, 2, File # E63829
- CSA certified to C22.2 #66.1, File # 221070
- cCSAus certified to C22.2 #66.3 / UL 5085-3, File #221070
- Class 2 - marked with (*) or (**) or (#)
- CSA certified as Inherently Limited (*)
- CSA certified as Non Inherently Limited (**) - see recommended fuse rating table.
- UL Recognized UL5085-3, Inherently Limited (#) File # E116583
- Customization: Custom versions available upon request.
Technical Specifications
| Product Description | Power Rating (VA) | Dielectric Strength (Vrms Hipot) | Primary Options | Secondary Options | Insulation System | Mounting Hardware | Weight (lbs / kg) | Dimensions (L x W x H inches / mm) |
|---|---|---|---|---|---|---|---|---|
| ST/DST Series | 1.1 to 36 | 2500 | Single or dual primaries, 115 V or 115/230 V, 50/60 Hz | Series or parallel | Class F, 155 C | See chart (ST-MS, ST-MN available) | 0.17 (0.08) to 1.1 (0.50) | Varies by VA rating (e.g., Size 2: 1.37x1.12x0.97) |
Part Number Selection & Secondary Ratings
| Part Number | Secondary RMS Rating (Series) | Secondary RMS Rating (Parallel) | Pin Configuration | Class 2 Marking |
|---|---|---|---|---|
| ST-2-10**# / DST-2-10**# | 10 VCT @ 0.11 A | 5 V @ 0.22 A | 6 Pin (ST) / 8 Pin (DST) | **# |
| ST-3-10*# / DST-3-10*# | 10 VCT @ 0.25 A | 5 V @ 0.5 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-4-10*# / DST-4-10*# | 10 VCT @ 0.6 A | 5 V @ 1.2 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-5-10*# / DST-5-10*# | 10 VCT @ 1.2 A | 5 V @ 2.4 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-6-10 / DST-6-10 | 10 VCT @ 2.0 A | 5 V @ 4.0 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-10 / DST-7-10 | 10 VCT @ 3.6 A | 5 V @ 7.2 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-12**# / DST-2-12**# | 12.6 VCT @ 0.09 A | 6.3 V @ 0.18 A | 6 Pin (ST) / 8 Pin (DST) | **# |
| ST-3-12*# / DST-3-12*# | 12.6 VCT @ 0.2 A | 6.3 V @ 0.4 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-4-12*# / DST-4-12*# | 12.6 VCT @ 0.5 A | 6.3 V @ 1.0 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-5-12*# / DST-5-12*# | 12.6 VCT @ 1.0 A | 6.3 V @ 2.0 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-6-12 / DST-6-12 | 12.6 VCT @ 1.6 A | 6.3 V @ 3.2 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-12 / DST-7-12 | 12.6 VCT @ 2.85 A | 6.3 V @ 5.7 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-16**# / DST-2-16**# | 16 VCT @ 0.07 A | 8 V @ 0.14 A | 6 Pin (ST) / 8 Pin (DST) | **# |
| ST-3-16*# / DST-3-16*# | 16 VCT @ 0.15 A | 8 V @ 0.3 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-4-16*# / DST-4-16*# | 16 VCT @ 0.4 A | 8 V @ 0.8 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-5-16*# / DST-5-16*# | 16 VCT @ 0.8 A | 8 V @ 1.6 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-6-16 / DST-6-16 | 16 VCT @ 1.25 A | 8 V @ 2.5 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-16 / DST-7-16 | 16 VCT @ 2.25 A | 8 V @ 4.5 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-20**# / DST-2-20**# | 20 VCT @ 0.055 A | 10 V @ 0.11 A | 6 Pin (ST) / 8 Pin (DST) | **# |
| ST-3-20*# / DST-3-20*# | 20 VCT @ 0.12 A | 10 V @ 0.24 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-4-20*# / DST-4-20*# | 20 VCT @ 0.3 A | 10 V @ 0.6 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-5-20*# / DST-5-20*# | 20 VCT @ 0.6 A | 10 V @ 1.2 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-6-20 / DST-6-20 | 20 VCT @ 1.0 A | 10 V @ 2.0 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-20 / DST-7-20 | 20 VCT @ 1.8 A | 10 V @ 3.6 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-24**# / DST-2-24**# | 24 VCT @ 0.045 A | 12 V @ 0.09 A | 6 Pin (ST) / 8 Pin (DST) | **# |
| ST-3-24*# / DST-3-24*# | 24 VCT @ 0.1 A | 12 V @ 0.2 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-4-24*# / DST-4-24*# | 24 VCT @ 0.25 A | 12 V @ 0.5 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-5-24*# / DST-5-24*# | 24 VCT @ 0.5 A | 12 V @ 1.0 A | 6 Pin (ST) / 8 Pin (DST) | *# |
| ST-6-24 / DST-6-24 | 24 VCT @ 0.8 A | 12 V @ 1.6 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-24 / DST-7-24 | 24 VCT @ 1.5 A | 12 V @ 3.0 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-28 / DST-2-28 | 28 VCT @ 0.04 A | 14 V @ 0.08 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-3-28 / DST-3-28 | 28 VCT @ 0.085 A | 14 V @ 0.17 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-4-28 / DST-4-28 | 28 VCT @ 0.2 A | 14 V @ 0.4 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-5-28 / DST-5-28 | 28 VCT @ 0.42 A | 14 V @ 0.84 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-6-28 / DST-6-28 | 28 VCT @ 0.7 A | 14 V @ 1.4 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-28 / DST-7-28 | 28 VCT @ 1.3 A | 14 V @ 2.6 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-36 / DST-2-36 | 36 VCT @ 0.03 A | 18 V @ 0.06 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-3-36 / DST-3-36 | 36 VCT @ 0.065 A | 18 V @ 0.13 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-4-36 / DST-4-36 | 36 VCT @ 0.17 A | 18 V @ 0.34 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-5-36 / DST-5-36 | 36 VCT @ 0.35 A | 18 V @ 0.7 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-6-36 / DST-6-36 | 36 VCT @ 0.55 A | 18 V @ 1.1 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-36 / DST-7-36 | 36 VCT @ 1.0 A | 18 V @ 2.0 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-48 / DST-2-48 | 48 VCT @ 0.023 A | 24 V @ 0.046 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-3-48 / DST-3-48 | 48 VCT @ 0.05 A | 24 V @ 0.1 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-4-48 / DST-4-48 | 48 VCT @ 0.125 A | 24 V @ 0.25 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-5-48 / DST-5-48 | 48 VCT @ 0.25 A | 24 V @ 0.5 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-6-48 / DST-6-48 | 48 VCT @ 0.4 A | 24 V @ 0.8 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-48 / DST-7-48 | 48 VCT @ 0.75 A | 24 V @ 1.5 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-56 / DST-2-56 | 56 VCT @ 0.02 A | 28 V @ 0.04 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-3-56 / DST-3-56 | 56 VCT @ 0.045 A | 28 V @ 0.09 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-4-56 / DST-4-56 | 56 VCT @ 0.11 A | 28 V @ 0.22 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-5-56 / DST-5-56 | 56 VCT @ 0.22 A | 28 V @ 0.44 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-6-56 / DST-6-56 | 56 VCT @ 0.35 A | 28 V @ 0.7 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-56 / DST-7-56 | 56 VCT @ 0.65A | 28 V @ 1.3 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-2-120 / DST-2-120 | 120 VCT @ 0.01 A | 60 V @ 0.02 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-3-120 / DST-3-120 | 120 VCT @ 0.02 A | 60 V @ 0.04 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-4-120 / DST-4-120 | 120 VCT @ 0.05 A | 60 V @ 0.1 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-5-120 / DST-5-120 | 120 VCT @ 0.1 A | 60 V @ 0.2 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-6-120 / DST-6-120 | 120 VCT @ 0.16 A | 60 V @ 0.32 A | 6 Pin (ST) / 8 Pin (DST) | None |
| ST-7-120 / DST-7-120 | 120 VCT @ 0.3 A | 60 V @ 0.6 A | 6 Pin (ST) / 8 Pin (DST) | None |
Recommended Secondary Fuse Values
| Code | Fuse Value (A) |
|---|---|
| (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 |
Mechanical Specifications
| Size VA | L (inches / mm) | W (inches / mm) | H (inches / mm) | ML (inches / mm) | A (inches / mm) | B (inches / mm) | C (inches / mm) | Optional Mounting Screw & Nut | Weight (lbs / kg) |
|---|---|---|---|---|---|---|---|---|---|
| 2 (1.1) | 1.37 (34.9) | 1.12 (28.6) | 0.97 (24.6) | - | 0.25 (6.4) | 0.25 (6.4) | 1.20 (30.5) | - | 0.17 (0.08) |
| 3 (2.4) | 1.37 (34.9) | 1.12 (28.6) | 1.21 (30.8) | - | 0.25 (6.4) | 0.25 (6.4) | 1.20 (30.5) | - | 0.25 (0.11) |
| 4 (6) | 1.62 (41.3) | 1.31 (33.3) | 1.31 (33.3) | 1.06 (26.9) | 0.25 (6.4) | 0.35 (8.9) | 1.25 (31.8) | Nylon 4-40 x 1.37 (4-40 x 34.9) | 0.44 (0.20) |
| 5 (12) | 1.91 (48.4) | 1.59 (40.4) | 1.45 (36.9) | 1.25 (31.8) | 0.30 (7.6) | 0.40 (10.2) | 1.41 (35.8) | Nylon 4-40 x 1.37 (4-40 x 34.9) | 0.70 (0.32) |
| 6 (20) | 2.25 (57.2) | 1.88 (47.8) | 1.45 (36.9) | 1.50 (38.1) | 0.30 (7.6) | 0.40 (10.2) | 1.60 (40.6) | Nylon 4-40 x 1.37 (4-40 x 34.9) | 0.80 (0.36) |
| 7 (36) | 2.62 (66.7) | 2.18 (55.5) | 1.59 (40.4) | - | 0.40 (10.2) | 0.40 (10.2) | 1.85 (47.0) | Size 7 has 4 mounting holes on 2.18 x 1.75 centers for #6 screws. | 1.1 (0.50) |
Note: Mounting hardware (ST-MS screw, ST-MN nut) available from Signal.
2411272143_Bel-Fuse-DST-4-28_C17571773.pdf
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