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China Class 2 split bobbin transformer Bel Fuse DST-7-28 designed for low capacitive coupling and isolation for sale

Class 2 split bobbin transformer Bel Fuse DST-7-28 designed for low capacitive coupling and isolation

Price Negotiable
Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable
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.


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Have questions about our products or want to discuss a custom order? Our team is ready to help you.

Company Changsha Purple Horn E-Commerce Co., Ltd.
Location 2332 Kaibin Commercial Plaza, No. 419 Shaoshan Middle Road, Shazitang Street, Yuhua District, Changsha City, Hunan Province
Contact Person Sellina

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