Product Overview
The Signal ST/DST Series Split/Tran Specialty Purpose & Class 2 Transformers are designed for high isolation and low capacitive coupling, utilizing a dual cavity platform. These split bobbin transformers feature rigid pin construction for enhanced board insertion reliability. They 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. The series is recognized by UL and CSA for safety and insulation systems, and is RoHS compliant.
Product Attributes
- Brand: Signal (Belfuse)
- Series: ST / DST Series Split/Tran
- Construction: Split Bobbin, Dual Cavity
- Isolation: Superior isolation, low capacitive coupling
- Pin Construction: Rigid, for easier board insertion and higher reliability
- 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, UL Recognized UL5085-3 (Inherently Limited)
- Compliance: RoHS Compliant
- Customization: Custom versions available upon request
Technical Specifications
| Model Type | VA Rating | Primary Voltage | Secondary RMS Rating (Series) | Secondary RMS Rating (Parallel) | Dielectric Strength | Insulation System | Weight (lbs/kg) | Dimensions (L x W x H) |
|---|---|---|---|---|---|---|---|---|
| ST (6 Pin) | 1.1 to 36 | 115 V, 50/60 Hz | Various (e.g., 10 VCT @ 0.11 A to 56 VCT @ 0.65 A) | Various (e.g., 5 V @ 0.22 A to 28 V @ 1.3 A) | 2500 Vrms Hipot | Class F, 155 C | 0.17 to 1.1 (0.08 to 0.50) | See table below |
| DST (8 Pin) | 1.1 to 36 | 115 V or 115/230 V, 50/60 Hz | Various (e.g., 10 VCT @ 0.11 A to 56 VCT @ 0.65 A) | Various (e.g., 5 V @ 0.22 A to 28 V @ 1.3 A) | 0.17 to 1.1 (0.08 to 0.50) | See table below |
Mechanical Specifications by Size:
| 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) |
Pin Configuration Diagrams:
16 Pin Type ST: 115 V 50/60 Hz
8 Pin Type DST: 115/230 V 50/60 Hz
Note: Numbers on diagrams indicate like polarity.
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
Refer to Accessories datasheet for mounting screw information. Mounting screws (ST-MS) and nuts (ST-MN) are available from Signal.
2411272143_Bel-Fuse-DST-2-56_C17562235.pdf
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