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Product Detailed Parameters
- Description：PWR XFMR LAMINATED 4.4VA TH
- Series：161
- Mfr：Hammond Manufacturing
- Package：Bulk
- Type：Laminated Core
- Voltage - Primary：115V
- Voltage - Secondary (Full Load)：Parallel 20V, Series 40V
- Current - Output (Max)：Parallel 220mA, Series 110mA
- Primary Winding(s)：Single
- Secondary Winding(s)：Single, Multiple Taps
- Center Tap：No
- Power - Max：4.4VA
- Mounting Type：Through Hole
- Termination Style：PC Pin
- Size / Dimension：42.93mm L x 31.75mm W
- Height - Seated (Max)：36.83mm
- Voltage - Isolation：2000Vrms
- Weight：0.35 lb (158.76 g)
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Overview
The Hammond Manufacturing 161F40 is a low voltage power transformer designed for PCB mounting. It features a single primary winding rated at 115 VAC and a dual secondary winding configuration providing 40 VAC Center Tap. The unit has a power rating of 4.4 VA with a secondary current capacity of 110 mA. It utilizes through-hole solder pin termination and operates within a temperature range of 0°C to +130°C at 60 Hz.
Feature Summary
- Vertical mount construction with split bobbin design
- Dual secondary winding capability for center tap applications
- Low voltage operation suitable for sensitive circuitry
- Through-hole solder pin termination for secure board attachment
Applications
- General purpose low voltage power supply circuits
- Industrial control panel instrumentation
- Consumer electronic device power stages
- Signal processing equipment interfaces
Procurement Notes
Verify the specific secondary current rating against application requirements, as the 161 series includes variants with different VA ratings. Confirm that the 115 VAC primary input matches the source voltage. Ensure the PCB layout accommodates the through-hole pin spacing and physical dimensions specified in the official datasheet to prevent mechanical stress during assembly.
Selection Notes
Select this model when a compact, vertically mounted transformer is required for 115 VAC to low voltage conversion. The 4.4 VA rating suits light loads. Consider the split bobbin design for improved isolation characteristics compared to standard wound transformers. Verify that the 40V CT output aligns with downstream rectification or regulation needs.
Part Context
The 161F40 belongs to the Hammond 161 series of low voltage PCB mount transformers. This series offers multiple VA sizes ranging from 0.5 to 24 VA. The 161F40 specifically addresses applications requiring moderate power density in a small footprint, utilizing vertical mounting to save board space while maintaining electrical safety standards.
Replacement Considerations
Direct substitutes include other Hammond 161 series models with identical electrical specifications but different form factors if available. Cross-reference with Hammond part numbers such as 161E40 or 161G28 only if their VA and current ratings meet or exceed the 4.4 VA / 110 mA requirement of the 161F40.
