Hammond 228H 10VA 40V CT 60Hz Epoxy PCB Transformer
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224-955-1644Key Features
- 10 VA at 60 Hz from a 115 VAC primary
- Series secondary: 40V C.T. @ 250ma
- Parallel secondary: 20V @ 500ma
- Epoxy cast to withstand shock and severe environments
- Two coil design: balanced windings, low magnetic radiation, no electrostatic shield
- Four 6-32 X .38 machine screw inserts ease strain on board connections
- PCB mount, 1.22 in max height, 0.50 in (13 mm) pin diameter
- 20 C temperature rise, 12.2% regulation
The 228H is a 10 VA, 60 Hz power transformer from the 228 Series, designed to mount on a printed circuit board and run from a 115 VAC primary. Its secondary is rated 40V C.T. @ 250ma with the windings in series, or 20V @ 500ma with them in parallel, giving designers two output options from one part.
The 228H is the 40 V centre-tapped member of the 10 VA, 60 Hz 228 group, rated 250 mA series or 20 V at 500 mA in parallel.
The transformer is epoxy cast to withstand shock and severe environments. A two coil design provides balanced windings and low magnetic radiation, so no electrostatic shield is required. Four 6-32 X .38 machine screw inserts reduce strain on the p.c. board connections.
Per the series table, the 228H stands 1.22 in high (max) with a pin diameter of 0.50 in (13 mm); shipping weight is 0.91 lbs (0.41 kg). Temperature rise is 20 C and regulation is 12.2%. The part is RoHS and REACH compliant, and it is classified under UNSPSC 39121301.
Note: the manufacturer states that the 226-227-228 product line will soon be discontinued as a stocked series and is available while quantities last.
Ideal For
- On-board 40V centre-tapped or 20V supply for 115 VAC equipment
- 60 Hz PCB-mounted power conversion
- Circuit boards exposed to shock or severe environments
- Replacement of an existing epoxy-cast PCB transformer
Overview
| Series | 228 Series (226-227-228 Series) |
| Description | Transformer, PCB mount, epoxy-cast, 10VA, 40V C.T. @ 250ma / 20V @ 500ma, 228 series |
| Product Type | Power transformer, PCB mount, epoxy cast |
| Availability Note | Series will soon be discontinued as a stocked series; available while quantities last |
| Short Description | POWER PCB 10VA 115V |
Dimensions
| High (Max) | 1.22 in |
| Pin Diameter | 0.50 in (13 mm) |
Electrical
| Frequency | 60 Hz |
| Regulation | 12.2% |
| Power Rating | 10 VA |
| Primary Voltage | 115 VAC |
| Temperature Rise | 20 C |
| Secondary (RMS) Series | 40V C.T. @ 250ma |
| Secondary (RMS) Parallel | 20V @ 500ma |
Identifiers
| UPC | 623980268309 |
| UNSPSC | 39121301 |
| Part Number | 228H |
Packaging & Shipping
| Shipping Weight | 0.91 lbs (0.41 kg) |
| Weight (Series Table) | 0.91 lbs |
Construction & Finish
| Mounting | PCB mount |
| Construction | Epoxy cast |
| Winding Design | Two coil design, balanced windings, low magnetic radiation; no electrostatic shield required |
| Mounting Inserts | Four 6-32 X .38 machine screw inserts |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What outputs does the 228H provide?▾
With the secondaries in series it delivers 40V C.T. @ 250ma; in parallel it delivers 20V @ 500ma. The rating is 10 VA.
What primary voltage and frequency is the 228H for?▾
It uses a 115 VAC primary and is a 60 Hz model.
How is the 228H mounted?▾
It mounts on a printed circuit board; the 228 series includes four 6-32 X .38 machine screw inserts for less strain on p.c. board connections.
What are the temperature rise and regulation of the 228H?▾
Temperature rise is 20 C and regulation is 12.2%.
Is the 228H still available?▾
The manufacturer notes the 226-227-228 line will soon be discontinued as a stocked series and is available while quantities last.
Does it need an electrostatic shield?▾
No. The two coil design provides balanced windings and low magnetic radiation, so no electrostatic shield is required.
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