Hammond Manufacturing 844 Audio Transformer - Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 844 is a broadcast quality audio transformer designed for chassis mount applications. It features a 40k/10k/10k primary impedance configuration with 500/125/125 secondary impedance, operating across the 50Hz to 15kHz audio frequency range. The part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible audio transformation capabilities.

Substiute Parts

844

Hammond ManufacturingIn Stock: 1137844 Datasheet

Current PartRFQ

844A

Hammond ManufacturingIn Stock: 726844A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the Hammond Manufacturing 844 is based on the following critical parameters:

• Impedance Matching: Primary impedance of 40k, 10k/10k and secondary impedance of 500, 125/125
• Frequency Response: Operating range of 50Hz to 15kHz with ±0.5dB frequency response
• Mounting Configuration: Chassis mount installation requirement
• Transformer Type: Broadcast quality audio transformer classification
• Compliance Standards: ROHS3 compliance and EAR99 ECCN classification

The Hammond Manufacturing 844A qualifies as a substitute based on matching frequency range (50Hz ~ 15kHz), frequency response (±0.5dB), chassis mount configuration, and identical compliance certifications (ROHS3, REACH Unaffected, EAR99).

Parameter Comparison

Engineering Selection Recommendations

The Hammond Manufacturing 844A is an active production substitute for the obsolete 844 model. Both parts maintain identical frequency response characteristics (±0.5dB) and operate within the same 50Hz to 15kHz audio bandwidth. Both parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements.

Key differences in selection criteria:

• Power Level: The 844A operates at 15dB compared to the 844's 20dB maximum, representing a 5dB reduction in power handling capacity.
• Physical Dimensions: The 844A has a reduced seated height of 1.250" versus 2.559" for the 844, affecting chassis integration space requirements.
• Termination: The 844 uses solder lugs while the 844A uses wire leads, requiring different connection methodologies.
• Product Availability: The 844A is in active production status, ensuring long-term supply continuity.

Selection of the 844A as a substitute requires verification that the reduced power level and physical dimensions are compatible with the target application's mechanical and electrical constraints.

Frequently Asked Questions (FAQ)

Q: What are the primary impedance specifications for the Hammond 844 and 844A?

A: The Hammond 844 features a primary impedance of 40k, 10k/10k ohms. The 844A specifications for primary impedance are not provided in the available technical data. Impedance matching is a critical substitution parameter and must be verified before implementation.

Q: Are the 844 and 844A compatible in terms of frequency response?

A: Both the 844 and 844A maintain identical frequency response of ±0.5dB across the 50Hz to 15kHz operating range, making them compatible for audio frequency applications within this bandwidth.

Q: What is the difference in power handling between these two models?

A: The 844 is rated for 20dB maximum power level, while the 844A is rated for 15dB. This 5dB difference represents a reduction in power handling capacity and must be evaluated against application requirements.

Q: How do the mounting and termination styles differ?

A: Both parts are chassis mount configurations. The 844 uses solder lug termination, while the 844A uses wire leads. This difference affects circuit board integration and connection methodology.

Q: Are both parts compliant with current regulatory standards?

A: Both the 844 and 844A are ROHS3 compliant, REACH Unaffected, and classified under ECCN EAR99, meeting current regulatory requirements for electronic component distribution.

Q: Why is the 844 classified as obsolete?

A: The 844 is no longer in active production. The 844A serves as the active production equivalent, ensuring continued availability for applications requiring this transformer type.