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Product Detailed Parameters
- Description：AUDIO TRANSFORMER, DIRECT BOX, C
- Series：1140
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Chassis Mount
- Size / Dimension：1.250" Dia (31.75mm)
- Height - Seated (Max)：1.069" (27.15mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：12:01
- Impedance - Primary (Ohms)：140k
- Impedance - Secondary (Ohms)：150
- DC Resistance (DCR) - Primary：4.25kOhm
- DC Resistance (DCR) - Secondary：72Ohm
- Transformer Type：Impedance Matching
- Frequency Range：20Hz ~ 20kHz
- Frequency Response：-0.07dB
- Voltage - Isolation：500V
- Insertion Loss：-
- Return Loss：-
- Power Level：-
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1140-DB-A is a single-channel audio transformer designed for direct box applications. It features chassis mount construction with wire lead termination and nickel alloy core material. The unit provides an impedance ratio of 200k to 1.5k, with primary coil impedance at 200 kohms and secondary coil impedance at 1.5 kohms. Electrical characteristics include a primary resistance of 4.25 kohms and secondary resistance of 72 ohms. The component measures 2.25 inches in length and 1.069 inches in width, offering shielded performance for signal integrity.
Feature Summary
- Chassis mount design suitable for direct box integration
- Shielded construction to minimize electromagnetic interference
- Nickel alloy core material for stable magnetic properties
Applications
- Direct box signal conversion
- Audio equipment interfacing
- Signal level transformation
Procurement Notes
Verify the specific manufacturer part number against official Hammond Manufacturing documentation to ensure compatibility with your circuit requirements. Confirm that the wire lead termination type matches your assembly process. Check RoHS compliance status through the official datasheet before procurement. Ensure the chassis mount dimensions fit your enclosure constraints.
Selection Notes
Select this component when a high-impedance to low-impedance transformation is required for direct box applications. The 200k to 1.5k ratio suits specific professional audio interfaces. Consider the shielded feature if noise reduction is critical. Verify that the wire lead termination aligns with your wiring infrastructure rather than PCB mounting needs.
Part Context
This component belongs to the 1140 series of audio transformers from Hammond Manufacturing. It is categorized under audio and signal transformers. The product line focuses on chassis-mounted solutions for professional audio environments. Other models in the series may offer different impedance ratios or form factors.
Replacement Considerations
Consult official Hammond Manufacturing substitution guides for verified alternatives. Cross-reference impedance ratios and physical dimensions to ensure functional equivalence. No specific substitute part numbers are confirmed in public documentation.
