Hammond 164F28 6VA 28V Center-Tapped PCB Transformer, 115V Primary
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Create Free Business AccountKey Features
- 6VA rating: 28V C.T. @ .2A with secondaries in series, 14V @ .4A in parallel
- Single 115V primary for 50/60 Hz operation
- Two-hole mounting with #4 screws (not provided) plus industry-standard PCB pin spacing
- Low-profile split bobbin, 1.63 x 1.31 x 1.31 in (L x W x H)
- Dual non-concentric secondaries; low coupling, no electrostatic shield required
- Class B 130 degrees C insulation, 2,500V RMS hipot
- c UL us recognized; RoHS and REACH compliant
Part number 164F28 is a 6VA, 115V single-primary power transformer for P.C. board mounting. Built on a low-profile split bobbin and rated for 50/60 Hz, it gives electronics designers and OEM builders a 28V C.T. secondary that solders straight onto the board. The output is 28V C.T. at 0.2A with the windings in series, or 14V at 0.4A in parallel.
Two secondary windings sit side by side on the split bobbin rather than concentrically, which keeps coupling between primary and secondary low and removes any need for an electrostatic shield. It carries Class B insulation (130 degrees C) and a 2,500V RMS hipot rating. The windings are designed so that all of them must be used.
On the series specification sheet the F-size body is 1.63 in long, 1.31 in wide and 1.31 in high, weighing 0.44 lb. The 6VA size uses two-hole mounting with #4 screws (mounting screws are not provided) in addition to its industry-standard P.C. board pins.
The transformer is c UL us recognized and listed as RoHS and REACH compliant. Where a design must run from 115V or 230V, the dual-primary equivalent in the same series is 162F28.
Ideal For
- Low-voltage AC supply on printed circuit boards
- Board-level designs needing 28V centre-tapped or 14V secondary
- OEM equipment powered from 115V, 50/60 Hz mains
- Low-profile PCB layouts with limited height
Mounting
| Mounting Type | P.C. board mount, industry standard pin spacing |
| Mounting Holes | Two-hole mounting (6 VA size) |
| Mounting Screw | #4 (mounting screws not provided) |
Overview
| Series | 162-164 Series (164 = single primary 115V) |
| Part Number | 164F28 |
| Product Type | Transformer, low voltage PCB mount, low profile |
| Short Description | POWER TX 6VA 115V 50/60HZ |
| Dual Primary (115/230V) Equivalent | 162F28 |
Dimensions
| Size Letter | F |
| Width (W) - Spec Sheet | 1.31" |
| Height (H) - Spec Sheet | 1.31" |
| Length (L) - Spec Sheet | 1.63" |
| Dimension A - Spec Sheet | 0.25" |
| Dimension B - Spec Sheet | 0.35" |
| Dimension C - Spec Sheet | 1.28" |
| Dimension M - Spec Sheet | 1.06" |
Electrical
| Hipot | 2,500V RMS |
| Frequency | 50/60 Hz |
| Primary Voltage | 115V (single primary) |
| Insulation Class | Class B, 130 degrees C |
| Power Rating (VA) | 6 |
| Electrostatic Shield | Not required (low primary to secondary coupling) |
| Secondary (RMS) Series | 28V C.T. @ .2A |
| Secondary Configuration | Dual winding secondaries, non-concentrically wound; all windings must be used |
| Secondary (RMS) Parallel | 14V @ .4A |
Identifiers
| UPC | 623980261423 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 0.36 lbs (0.16 kg) |
Construction & Finish
| Design | Low profile, split bobbin |
| Unit Weight - Spec Sheet | 0.44 lbs |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
| Agency Recognition | c UL us recognized |
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Frequently Asked Questions
What output voltage and current does the 164F28 provide?▾
With the two secondaries connected in series it provides 28V C.T. @ .2A; connected in parallel it provides 14V @ .4A. The transformer is rated 6VA.
Can I use only one of the secondary windings?▾
The series is designed so that all windings must be used, so connect both secondary windings, either in series for the centre-tapped output or in parallel for the lower-voltage, higher-current output.
What input voltage does the 164F28 accept?▾
It has a single 115V primary and operates on 50/60 Hz. For universal 115/230V dual-primary operation, the matching part in the series is 162F28.
How is it mounted?▾
It mounts on a P.C. board with industry-standard pin spacing and uses two-hole mounting with #4 screws. Mounting screws are not provided.
What are the dimensions of the 164F28?▾
The series specification sheet lists the F size at 1.63 in L x 1.31 in W x 1.31 in H, with a weight of 0.44 lb. Shipping weight is 0.36 lbs (0.16 kg).
What insulation and safety ratings does it carry?▾
Class B insulation rated 130 degrees C, a 2,500V RMS hipot, and c UL us recognition. It is also listed as RoHS and REACH compliant.
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