Hammond 183F28 5VA 28V C.T. PCB Mount Power Transformer
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Create Free Business AccountKey Features
- 5 VA rating: 28V C.T. @ 0.18A with secondaries in series, 14V @ 0.36A in parallel
- Universal dual primary: 115 VAC (parallel) or 230 VAC (series), 50/60 Hz
- Dual non-concentrically wound secondaries usable in series, parallel or separately
- Hipot 4,000 V RMS; Class F (155 °C) insulation; no electrostatic shield required
- Low profile body 1.63 x 1.44 x 1.38 in (41.4 x 36.6 x 35.1 mm), 0.025 in square pins
- P.C. board mount, industry standard pin spacing, two-hole #4 screw mounting (screws not provided)
- Series listed cUL; part drawing cites cURus, CE and TUV; RoHS and REACH compliant
The 183F28 is a 5 VA low voltage P.C. board mounted power transformer offering 28 V C.T. at 0.18 A with its secondaries in series, or 14 V at 0.36 A in parallel. A universal dual primary accepts 115 VAC (parallel primary wiring) or 230 VAC (series primary wiring) at 50/60 Hz, so one board layout can serve both mains voltages.
The low profile split bobbin and top shroud design separates primary and secondary windings; because the dual secondaries are non-concentrically wound, coupling is low and no electrostatic shield is needed. Hipot is 4,000 V RMS and the insulation system is Class F at 155 °C.
Per the 183F28 drawing, the body measures 1.63 in (41.4 mm) long, 1.44 in (36.6 mm) wide and 1.38 in (35.1 mm) high, with 0.025 in (0.6 mm) pins, #4 mounting screws (not provided) in a two-hole pattern, and a weight of 0.37 lbs (0.17 kg).
For 115 V operation the two primaries (pins 1-3 and 4-6) are connected in parallel; for 230 V they are connected in series. Joining secondary pin 9 to pin 10 places the windings in series, and that connection acts as the center tap. Pin numbers are not marked on the unit; a paint dot always identifies the secondary side (pins 12-7).
The 183 Series is cUL listed, and the drawing for this part cites agency listings of cURus, CE and TUV; 183F28 is RoHS and REACH compliant.
Ideal For
- 28 V C.T. or 14 V AC supply on a printed circuit board
- Products intended for worldwide 115 V or 230 V operation
- Circuits that use the two secondaries in series, parallel or separately
Overview
| Series | 183 Series (Low Voltage PCB Mount - Universal - 2.5 VA to 56 VA) |
| Description | Transformer, low voltage PCB mount, 115/230V, 5VA, 28V C.T. @ 0.18A, 183 Series |
| Product Type | Transformer, low voltage PCB mount |
| Short Description | POWER PCB 5VA 115/230 |
| Bulk Pack Part No. | 183F28-BULK |
Dimensions
| Width (W) | 1.44 in (36.6 mm) |
| Height (H) | 1.38 in (35.1 mm) |
| Length (L) | 1.63 in (41.4 mm) |
| Dimension A | 0.20 in (5.1 mm) |
| Dimension B | 0.40 in (10.2 mm) |
| Dimension C | 1.00 in (25.4 mm) |
| Dimension M | 1.06 in (26.9 mm) |
| Pin Size (Square) | 0.025 in (0.6 mm) |
Electrical
| Hipot | 4,000V RMS |
| Primary | Dual primary, 115 / 230 VAC |
| Coupling | Low primary to secondary coupling - no electrostatic shield required |
| Frequency | 50/60 Hz |
| Center Tap | Series connection (pin 9 connected to pin 10) acts as the C.T. (center tap) |
| Primary Pins | 1, 3, 4, 6 |
| Secondary Pins | 7, 9, 10, 12 |
| Power Rating (VA) | 5 |
| Secondary (RMS) Series | 28V C.T. @ 0.18A |
| Secondary Configuration | Dual winding secondaries, non-concentrically wound; can be wired in series, parallel or used separately |
| Secondary (RMS) Parallel | 14V @ 0.36A |
Identifiers
| UPC | 623980258959 |
| UNSPSC | 39121301 |
| Part Number | 183F28 |
Packaging & Shipping
| Shipping Weight | 0.37 lbs (0.17 kg) |
| Unit Weight (Drawing) | 0.37 lbs. / 0.17 kg |
Construction & Finish
| Bobbin | Low profile, split bobbin with top shroud design |
| Mounting | P.C. board mount with industry standard pin spacing |
| Mounting Holes | Two hole mounting (mounting screws not provided) |
| Mounting Screw | #4 |
| Insulation Class | Class F, 155 degrees C |
| Pin Identification | Pin numbers are not on the unit; the paint dot is always on the secondary side (pins 12-7) |
Compliance & Certifications
| RoHS Compliant | Yes |
| Series Listing | cUL |
| REACH Compliant | Yes |
| Agency Listings (Drawing) | cURus, CE, and TUV |
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Frequently Asked Questions
What output does the 183F28 provide?▾
It is rated 5 VA: 28V C.T. @ 0.18A with the secondaries connected in series, or 14V @ 0.36A with them connected in parallel. The windings can also be used separately.
Can it run on both 115 V and 230 V?▾
Yes. It has a universal dual primary for 50/60 Hz. Connect the two primary windings in parallel for 115 VAC or in series for 230 VAC.
Where is the center tap?▾
When the secondaries are connected in series by joining pin 9 to pin 10, that connection acts as the C.T. (center tap).
What are the dimensions of the 183F28?▾
The drawing gives L 1.63 in (41.4 mm), W 1.44 in (36.6 mm) and H 1.38 in (35.1 mm), with 0.025 in (0.6 mm) pins, a #4 screw type and a weight of 0.37 lbs (0.17 kg).
How do I identify the pins?▾
Pin numbers are not printed on the unit. Look for the paint dot, which is always on the secondary side (pins 12-7).
Are mounting screws included?▾
No. The 5 VA size uses two-hole mounting and the manufacturer states mounting screws are not provided; the specified screw is #4.
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