Hammond 162D28 1.1VA 28V CT Low Profile PCB Transformer, 115/230V
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Create Free Business AccountKey Features
- 1.1 VA dual primary 115/230V transformer for 50/60 Hz operation
- Secondary 28V C.T. @ .04A in series or 14V @ .08A in parallel (RMS)
- Two 14V secondary windings, 40mA each per the drawing
- Low profile, split bobbin design with non-concentrically wound dual secondaries
- No mounting hardware required at 1.1 VA; industry standard pin spacing
- Hipot 2,500V RMS; Class B insulation rated 130 degrees C
- c UL us recognized; RoHS and REACH compliant
- Single 115V primary equivalent: 164D28
The 162D28 is a low voltage, low profile P.C. board mount power transformer from the 162-164 Series, aimed at OEM and circuit board designers who want one part that runs from either 115V or 230V. It is the universal dual primary (115/230V) version, rated 1.1 VA for 50/60 Hz operation; the single 115V primary equivalent is 164D28.
The drawing lists two 14V secondaries at 40 mA each, yielding 28V centre-tapped at .04A in series or 14V at .08A in parallel. The drawing's no-load test lists 19.66V ±2% on each secondary (pins 5-6 and 7-8) at 115V, 60 Hz, and the units are designed so that all windings must be used.
Construction is a low profile, split bobbin design with dual winding secondaries that are non-concentrically wound. Low primary to secondary coupling means no electrostatic shield is required. Insulation is Class B (130 degrees C), and the hipot rating is 2,500V RMS; the drawing specifies the primary-to-secondary hipot test at 2500V, 60Hz for 1 second. Pin numbers are embossed on the bobbin flange.
Per the part drawing the body measures 0.930" high, with L 1.375" and W 1.125". The 1.1 VA size needs no mounting hardware and uses industry standard pin spacing for P.C. board mounting. The series is c UL us recognized, the part is RoHS and REACH compliant, and it ships at 0.15 lbs (0.07 kg).
Ideal For
- P.C. board mounted 28V centre-tapped AC supply
- 14V secondary using parallel-connected windings
- Equipment designed for 115V or 230V, 50/60 Hz input
- Low profile circuit board layouts
Overview
| Series | 162-164 Series (162 = dual primary 115/230V) |
| Description | Transformer, low voltage PCB mount, low profile, 115/230V, 1.1VA, 28V C.T. @ .04A |
| Size Letter | D |
| Product Type | Transformer, low voltage PCB mount, low profile |
| Short Description | POWER TX 1.1VA 115/230 |
| Single Primary Equivalent (115V) | 164D28 |
Dimensions
| Width (W) | 1.125" ±0.030 |
| Height (H) | 0.930" ±0.030 |
| Length (L) | 1.375" ±0.030 |
| Dimension A | 0.250" ±0.030 |
| Dimension B | 0.250" ±0.030 |
| Dimension C | 1.220" ±0.030 |
| Dimension E | 0.735" ±0.030 |
| Dimension F | 0.040" ±0.005 |
| Dimension G | 0.234" ±0.005 |
| Dimension J | 0.290" ±0.030 |
| Dimension K | 0.270" ±0.030 |
| Dimension M | 0.350" ±0.030 |
| Dimension N | 0.970" ±0.030 |
| Pin Size (D) | 0.041" x 0.018" ±0.005 |
| Series Table L X W X H | 1.38 x 1.13 x 15/16 in |
Electrical
| Frequency | 50/60 Hz |
| Winding Use | Designed so that all windings must be used |
| Power Rating | 1.1 VA |
| Primary Voltage | 115/230V dual primary (two 115V windings, pins 1-2 and 3-4) |
| Insulation Class | Class B, 130 degrees C |
| Drawing VA Marking | 1.1VA |
| Secondary Windings | Two windings (pins 5-6 and 7-8), 14V 40mA each |
| Electrostatic Shield | Not required (low primary to secondary coupling) |
| Hipot (Series Rating) | 2,500V RMS |
| Secondary (RMS) Series | 28V C.T. @ .04A |
| Excitation Current (Iex) | 14.4mA Max. @ 115V, 60Hz, pin 1 - pin 2 |
| Secondary (RMS) Parallel | 14V @ .08A |
| DC Resistance, Pin 1 - Pin 2 | 1.593k ±20% @ 20°C |
| DC Resistance, Pin 3 - Pin 4 | 2.138k ±20% @ 20°C |
| DC Resistance, Pin 5 - Pin 6 | 43.11 ±20% @ 20°C |
| DC Resistance, Pin 7 - Pin 8 | 60.10 ±20% @ 20°C |
| Hipot Test, Primary - Secondary | 2500V, 60Hz, 1 sec |
| Secondary No-Load Voltage, Pin 3 - Pin 4 | 115.0V ±2% (@ 115V, 60Hz, pin 1 - pin 2) |
| Secondary No-Load Voltage, Pin 5 - Pin 6 | 19.66V ±2% (@ 115V, 60Hz, pin 1 - pin 2) |
| Secondary No-Load Voltage, Pin 7 - Pin 8 | 19.66V ±2% (@ 115V, 60Hz, pin 1 - pin 2) |
Identifiers
| UPC | 623980261010 |
| UNSPSC | 39121301 |
| Part Number | 162D28 |
Packaging & Shipping
| Shipping Weight | 0.15 lbs (0.07 kg) |
| Weight (Series Mechanical Table) | 0.17 lbs |
Construction & Finish
| Profile | Low profile, split bobbin design |
| Mounting | P.C. board mount, industry standard pin spacing; no mounting hardware required (1.1 VA size) |
| Pin Marking | Pin numbers embossed on bobbin flange |
| Secondary Winding | Dual winding secondaries, non-concentrically wound |
Compliance & Certifications
| UL | c UL us recognized |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
Can the 162D28 run on both 115V and 230V?▾
Yes. The 162D28 is the universal dual primary 115/230V model with two 115V primary windings (pins 1-2 and 3-4), rated for 50/60 Hz. The single 115V primary equivalent is 164D28.
What are the output ratings of the 162D28?▾
It is rated 1.1 VA: 28V C.T. @ .04A with the secondaries in series, or 14V @ .08A in parallel (RMS). The drawing shows two 14V windings at 40mA each.
Can I leave one secondary winding unused?▾
The series data states the units are designed so that all windings must be used.
Do I need mounting screws?▾
No mounting hardware is required on the 1.1 VA size; it is a P.C. board mount part with industry standard pin spacing.
What insulation and hipot ratings apply?▾
Class B insulation rated 130 degrees C and a hipot of 2,500V RMS; the drawing tests primary to secondary at 2500V, 60Hz for 1 second.
What are the dimensions of the 162D28?▾
The drawing gives L 1.375" ±0.030, W 1.125" ±0.030 and H 0.930" ±0.030. Shipping weight is 0.15 lbs (0.07 kg).
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