Hammond Manufacturing 812 Audio Transformer - Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 812 is a broadcast quality audio transformer designed for chassis mount applications, operating across the 50Hz to 15kHz frequency range. This transformer features dual impedance configurations on both primary (500, 125/125 Ohms) and secondary (40k, 10k/10k Ohms) windings, making it suitable for professional audio signal conditioning and impedance matching applications.

The 812 is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system maintenance and new design implementations. Active substitute models maintain core electrical and mechanical compatibility while offering current manufacturing availability.

Substiute Parts

812

Hammond ManufacturingIn Stock: 952812 Datasheet

Current PartRFQ

812A

Hammond ManufacturingIn Stock: 744812A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The Hammond Manufacturing 812A serves as the designated substitute for the obsolete 812 model. Substitution eligibility is determined by the following critical parameters:

Primary Substitution Criteria:

• Frequency Range: Both models operate 50Hz ~ 15kHz
• Frequency Response: Identical ±0.5dB specification
• Power Level: Matching 15dB rating
• Mounting Type: Both chassis mount configurations
• Transformer Type: Broadcast quality audio transformer classification
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected, EAR99 classification

Mechanical Compatibility:

• Chassis mount form factor maintained
• Termination style differs (812 uses Solder Lug; 812A uses Wire Leads)
• Height variation: 812A seated height 1.250" (31.75mm) versus 812 at 2.559" (65.00mm)

The 812A maintains electrical performance specifications within the audio frequency band while offering active manufacturing status and current inventory availability.

Parameter Comparison

Engineering Selection Recommendations

Selection between the Hammond 812 and 812A is determined by application requirements and regulatory constraints:

For Obsolete 812 Replacement: The Hammond 812A is the designated substitute, maintaining identical frequency response and power level specifications. Both models satisfy ROHS3 compliance and REACH regulatory requirements, ensuring compatibility with current environmental standards.

Termination Consideration: The 812 employs solder lug termination while the 812A uses wire leads. Circuit board layout and connection methodology must accommodate this termination style difference.

Physical Envelope: The 812A presents a reduced seated height of 1.250" compared to the 812 at 2.559". Space-constrained chassis designs may benefit from the 812A's compact profile, provided wire lead routing accommodates the application.

Inventory Status: The 812A maintains active production status with current stock availability, whereas the 812 is obsolete. New designs and system maintenance should specify the 812A to ensure long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can the Hammond 812A directly replace the Hammond 812 in existing designs?

A: The 812A maintains electrical performance specifications (frequency range, frequency response, power level) required for audio transformer applications. Termination style and physical height differences require circuit board layout verification. Wire lead routing and connection methodology must be adapted from the original solder lug configuration.

Q: What are the key electrical parameters that define substitution eligibility?

A: Frequency range (50Hz ~ 15kHz), frequency response (±0.5dB), and power level (15dB) are the primary electrical criteria. Both models meet these specifications. Impedance values and DC resistance characteristics are specific to each model and must be evaluated against application requirements.

Q: Are both models compliant with current environmental regulations?

A: Yes. Both the Hammond 812 and 812A are ROHS3 Compliant and REACH Unaffected, meeting current environmental standards for electronic component manufacturing and use.

Q: What is the significance of the termination style difference?

A: The 812 uses solder lug termination for direct PCB mounting, while the 812A employs wire leads for flexible connection routing. Circuit design must accommodate the selected termination method. Wire lead configurations allow for off-board mounting and flexible positioning within the chassis.

Q: Why is the 812A recommended over the 812 for new applications?

A: The 812A maintains active manufacturing status and current inventory availability. The 812 is classified as obsolete, presenting supply chain risk for ongoing production and system maintenance. Specifying the 812A ensures component availability for both immediate and future requirements.