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Specifications
Secondary Winding:
2
Isolation Voltage(Vrms):
2.5kV
Primary Winding(s):
2
Secondary Side Voltage:
14V;28V
Output Current:
2.6A;1.3A
Primary Side Voltage:
115V;230V
Mfr. Part #:
DST-7-28
Package:
Through Hole-8P,66.7x55.5mm
Key Attributes
Model Number:
DST-7-28
Product Description
Bel Fuse Signal ST / DST Series Split/Tran Specialty Purpose & Class 2 Transformers
Product Overview
The Bel Fuse Signal ST and DST Series Split/Tran transformers are specialty purpose and Class 2 transformers designed for printed circuit board mounting. Utilizing a split bobbin construction with dual cavities, these transformers offer superior isolation and low capacitive coupling. Their rigid pin construction ensures easier board insertion and enhanced reliability. These transformers are suitable for a wide range of applications requiring reliable power conversion and isolation.
Product Attributes
- Brand: Bel Fuse Signal
- Series: ST / DST Series Split/Tran
- Construction: Split Bobbin with Dual Cavity
- Insulation System: Class F, 155 C
- RoHS Compliant: Yes
- 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
Technical Specifications
General Specifications
| Specification | Value |
|---|---|
| Power | 1.1 VA to 36 VA |
| Dielectric Strength | 2500 Vrms Hipot |
| Primaries | Single or dual primaries, 115 V or 115/230 V, 50/60 Hz |
| Secondaries | Series or parallel |
| Electrostatic Shield | Not necessary, split bobbin construction |
| Insulation System | Class F, 155 C |
Part Number Selection & Secondary Ratings
| Part Number | Secondary RMS Rating | Pin Configuration | VA Rating |
|---|---|---|---|
| ST-2-10**# | 10 VCT @ 0.11 A | 6 Pin (ST) | 1.1 |
| DST-2-10**# | 5 V @ 0.22 A | 8 Pin (DST) | 1.1 |
| ST-3-10*# | 10 VCT @ 0.25 A (5) | 6 Pin (ST) | 2.4 |
| DST-3-10*# | 5 V @ 0.5 A (9) | 8 Pin (DST) | 2.4 |
| ST-4-10*# | 10 VCT @ 0.6 A (9) | 6 Pin (ST) | 6 |
| DST-4-10*# | 5 V @ 1.2 A (11) | 8 Pin (DST) | 6 |
| ST-5-10*# | 10 VCT @ 1.2 A (11) | 6 Pin (ST) | 12 |
| DST-5-10*# | 5 V @ 2.4 A (13) | 8 Pin (DST) | 12 |
| ST-6-10 | 10 VCT @ 2.0 A | 6 Pin (ST) | 20 |
| DST-6-10 | 5 V @ 4.0 A | 8 Pin (DST) | 20 |
| ST-7-10 | 10 VCT @ 3.6 A | 6 Pin (ST) | 36 |
| DST-7-10 | 5 V @ 7.2 A | 8 Pin (DST) | 36 |
| ST-2-12**# | 12.6 VCT @ 0.09 A | 6 Pin (ST) | 1.1 |
| DST-2-12**# | 6.3 V @ 0.18 A | 8 Pin (DST) | 1.1 |
| ST-3-12*# | 12.6 VCT @ 0.2 A (4) | 6 Pin (ST) | 2.4 |
| DST-3-12*# | 6.3 V @ 0.4 A (8) | 8 Pin (DST) | 2.4 |
| ST-4-12*# | 12.6 VCT @ 0.5 A (9) | 6 Pin (ST) | 6 |
| DST-4-12*# | 6.3 V @ 1.0 A (11) | 8 Pin (DST) | 6 |
| ST-5-12*# | 12.6 VCT @ 1.0 A (11) | 6 Pin (ST) | 12 |
| DST-5-12*# | 6.3 V @ 2.0 A (13) | 8 Pin (DST) | 12 |
| ST-6-12 | 12.6 VCT @ 1.6 A | 6 Pin (ST) | 20 |
| DST-6-12 | 6.3 V @ 3.2 A | 8 Pin (DST) | 20 |
| ST-7-12 | 12.6 VCT @ 2.85 A | 6 Pin (ST) | 36 |
| DST-7-12 | 6.3 V @ 5.7 A | 8 Pin (DST) | 36 |
| ST-2-16**# | 16 VCT @ 0.07 A | 6 Pin (ST) | 1.1 |
| DST-2-16**# | 8 V @ 0.14 A | 8 Pin (DST) | 1.1 |
| ST-3-16*# | 16 VCT @ 0.15 A (3) | 6 Pin (ST) | 2.4 |
| DST-3-16*# | 8 V @ 0.3 A (6) | 8 Pin (DST) | 2.4 |
| ST-4-16*# | 16 VCT @ 0.4 A (7) | 6 Pin (ST) | 6 |
| DST-4-16*# | 8 V @ 0.8 A (10) | 8 Pin (DST) | 6 |
| ST-5-16*# | 16 VCT @ 0.8 A (10) | 6 Pin (ST) | 12 |
| DST-5-16*# | 8 V @ 1.6 A (12) | 8 Pin (DST) | 12 |
| ST-6-16 | 16 VCT @ 1.25 A | 6 Pin (ST) | 20 |
| DST-6-16 | 8 V @ 2.5 A | 8 Pin (DST) | 20 |
| ST-7-16 | 16 VCT @ 2.25 A | 6 Pin (ST) | 36 |
| DST-7-16 | 8 V @ 4.5 A | 8 Pin (DST) | 36 |
| ST-2-20**# | 20 VCT @ 0.055 A | 6 Pin (ST) | 1.1 |
| DST-2-20**# | 10 V @ 0.11 A | 8 Pin (DST) | 1.1 |
| ST-3-20*# | 20 VCT @ 0.12 A (2) | 6 Pin (ST) | 2.4 |
| DST-3-20*# | 10 V @ 0.24 A (5) | 8 Pin (DST) | 2.4 |
| ST-4-20*# | 20 VCT @ 0.3 A (6) | 6 Pin (ST) | 6 |
| DST-4-20*# | 10 V @ 0.6 A (9) | 8 Pin (DST) | 6 |
| ST-5-20*# | 20 VCT @ 0.6 A (9) | 6 Pin (ST) | 12 |
| DST-5-20*# | 10 V @ 1.2 A (11) | 8 Pin (DST) | 12 |
| ST-6-20 | 20 VCT @ 1.0 A | 6 Pin (ST) | 20 |
| DST-6-20 | 10 V @ 2.0 A | 8 Pin (DST) | 20 |
| ST-7-20 | 20 VCT @ 1.8 A | 6 Pin (ST) | 36 |
| DST-7-20 | 10 V @ 3.6 A | 8 Pin (DST) | 36 |
| ST-2-24**# | 24 VCT @ 0.045 A | 6 Pin (ST) | 1.1 |
| DST-2-24**# | 12 V @ 0.09 A | 8 Pin (DST) | 1.1 |
| ST-3-24*# | 24 VCT @ 0.1 A (1) | 6 Pin (ST) | 2.4 |
| DST-3-24*# | 12 V @ 0.2 A (4) | 8 Pin (DST) | 2.4 |
| ST-4-24*# | 24 VCT @ 0.25 A (5) | 6 Pin (ST) | 6 |
| DST-4-24*# | 12 V @ 0.5 A (9) | 8 Pin (DST) | 6 |
| ST-5-24*# | 24 VCT @ 0.5 A (9) | 6 Pin (ST) | 12 |
| DST-5-24*# | 12 V @ 1.0 A (11) | 8 Pin (DST) | 12 |
| ST-6-24 | 24 VCT @ 0.8 A | 6 Pin (ST) | 20 |
| DST-6-24 | 12 V @ 1.6 A | 8 Pin (DST) | 20 |
| ST-7-24 | 24 VCT @ 1.5 A | 6 Pin (ST) | 36 |
| DST-7-24 | 12 V @ 3.0 A | 8 Pin (DST) | 36 |
| ST-2-28 | 28 VCT @ 0.04 A | 6 Pin (ST) | 1.1 |
| DST-2-28 | 14 V @ 0.08 A | 8 Pin (DST) | 1.1 |
| ST-3-28 | 28 VCT @ 0.085 A | 6 Pin (ST) | 2.4 |
| DST-3-28 | 14 V @ 0.17 A | 8 Pin (DST) | 2.4 |
| ST-4-28 | 28 VCT @ 0.2 A | 6 Pin (ST) | 6 |
| DST-4-28 | 14 V @ 0.4 A | 8 Pin (DST) | 6 |
| ST-5-28 | 28 VCT @ 0.42 A | 6 Pin (ST) | 12 |
| DST-5-28 | 14 V @ 0.84 A | 8 Pin (DST) | 12 |
| ST-6-28 | 28 VCT @ 0.7 A | 6 Pin (ST) | 20 |
| DST-6-28 | 14 V @ 1.4 A | 8 Pin (DST) | 20 |
| ST-7-28 | 28 VCT @ 1.3 A | 6 Pin (ST) | 36 |
| DST-7-28 | 14 V @ 2.6 A | 8 Pin (DST) | 36 |
| ST-2-36 | 36 VCT @ 0.03 A | 6 Pin (ST) | 1.1 |
| DST-2-36 | 18 V @ 0.06 A | 8 Pin (DST) | 1.1 |
| ST-3-36 | 36 VCT @ 0.065 A | 6 Pin (ST) | 2.4 |
| DST-3-36 | 18 V @ 0.13 A | 8 Pin (DST) | 2.4 |
| ST-4-36 | 36 VCT @ 0.17 A | 6 Pin (ST) | 6 |
| DST-4-36 | 18 V @ 0.34 A | 8 Pin (DST) | 6 |
| ST-5-36 | 36 VCT @ 0.35 A | 6 Pin (ST) | 12 |
| DST-5-36 | 18 V @ 0.7 A | 8 Pin (DST) | 12 |
| ST-6-36 | 36 VCT @ 0.55 A | 6 Pin (ST) | 20 |
| DST-6-36 | 18 V @ 1.1 A | 8 Pin (DST) | 20 |
| ST-7-36 | 36 VCT @ 1.0 A | 6 Pin (ST) | 36 |
| DST-7-36 | 18 V @ 2.0 A | 8 Pin (DST) | 36 |
| ST-2-48 | 48 VCT @ 0.023 A | 6 Pin (ST) | 1.1 |
| DST-2-48 | 24 V @ 0.046 A | 8 Pin (DST) | 1.1 |
| ST-3-48 | 48 VCT @ 0.05 A | 6 Pin (ST) | 2.4 |
| DST-3-48 | 24 V @ 0.1 A | 8 Pin (DST) | 2.4 |
| ST-4-48 | 48 VCT @ 0.125 A | 6 Pin (ST) | 6 |
| DST-4-48 | 24 V @ 0.25 A | 8 Pin (DST) | 6 |
| ST-5-48 | 48 VCT @ 0.25 A | 6 Pin (ST) | 12 |
| DST-5-48 | 24 V @ 0.5 A | 8 Pin (DST) | 12 |
| ST-6-48 | 48 VCT @ 0.4 A | 6 Pin (ST) | 20 |
| DST-6-48 | 24 V @ 0.8 A | 8 Pin (DST) | 20 |
| ST-7-48 | 48 VCT @ 0.75 A | 6 Pin (ST) | 36 |
| DST-7-48 | 24 V @ 1.5 A | 8 Pin (DST) | 36 |
| ST-2-56 | 56 VCT @ 0.02 A | 6 Pin (ST) | 1.1 |
| DST-2-56 | 28 V @ 0.04 A | 8 Pin (DST) | 1.1 |
| ST-3-56 | 56 VCT @ 0.045 A | 6 Pin (ST) | 2.4 |
| DST-3-56 | 28 V @ 0.09 A | 8 Pin (DST) | 2.4 |
| ST-4-56 | 56 VCT @ 0.11 A | 6 Pin (ST) | 6 |
| DST-4-56 | 28 V @ 0.22 A | 8 Pin (DST) | 6 |
| ST-5-56 | 56 VCT @ 0.22 A | 6 Pin (ST) | 12 |
| DST-5-56 | 28 V @ 0.44 A | 8 Pin (DST) | 12 |
| ST-6-56 | 56 VCT @ 0.35 A | 6 Pin (ST) | 20 |
| DST-6-56 | 28 V @ 0.7 A | 8 Pin (DST) | 20 |
| ST-7-56 | 56 VCT @ 0.65 A | 6 Pin (ST) | 36 |
| DST-7-56 | 28 V @ 1.3 A | 8 Pin (DST) | 36 |
| ST-2-120 | 120 VCT @ 0.01 A | 6 Pin (ST) | 1.1 |
| DST-2-120 | 60 V @ 0.02 A | 8 Pin (DST) | 1.1 |
| ST-3-120 | 120 VCT @ 0.02 A | 6 Pin (ST) | 2.4 |
| DST-3-120 | 60 V @ 0.04 A | 8 Pin (DST) | 2.4 |
| ST-4-120 | 120 VCT @ 0.05 A | 6 Pin (ST) | 6 |
| DST-4-120 | 60 V @ 0.1 A | 8 Pin (DST) | 6 |
| ST-5-120 | 120 VCT @ 0.1 A | 6 Pin (ST) | 12 |
| DST-5-120 | 60 V @ 0.2 A | 8 Pin (DST) | 12 |
| ST-6-120 | 120 VCT @ 0.16 A | 6 Pin (ST) | 20 |
| DST-6-120 | 60 V @ 0.32 A | 8 Pin (DST) | 20 |
| ST-7-120 | 120 VCT @ 0.3 A | 6 Pin (ST) | 36 |
| DST-7-120 | 60 V @ 0.6 A | 8 Pin (DST) | 36 |
Recommended Secondary Fuse Values
| Code | Value |
|---|---|
| (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) | Mounting Hardware | 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) | 4 mounting holes on 2.18 x 1.75 centers for #6 screws | 1.1 (0.50) |
Mounting screw (ST-MS) and nut (ST-MN) available from Signal.
Pin identification: 1, 2, 3, 4, 5, 6, 7, 8. Indicates like polarity.
2411272143_Bel-Fuse-DST-7-28_C17619949.pdf
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