Hammond Manufacturing 290AEX Power Transformer Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 290AEX is a laminated core power transformer designed for chassis mount applications with a single primary winding and triple secondary windings. The unit operates at 240V primary input with secondary outputs of 650V, 6.3V, and 5V, delivering maximum currents of 81mA, 2A, and 2A respectively. This transformer features center tap configuration and wire lead termination.

The 290AEX is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy equipment utilizing this component.

Substiute Parts

290AEX

Hammond ManufacturingIn Stock: 920290AEX Datasheet

Current PartRFQ

291AEX

Hammond ManufacturingIn Stock: 1130291AEX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The Hammond Manufacturing 291AEX qualifies as a substitute for the 290AEX based on the following alignment of critical parameters:

Matching Core Specifications:

• Laminated core construction type
• Triple secondary windings with center tap configuration
• Identical physical dimensions: 64.60mm L x 71.55mm W, 77.80mm height
• Identical weight: 3 lbs (1.4 kg)
• Chassis mount configuration with wire lead termination
• Identical secondary voltage outputs: 650V, 6.3V, 5V
• Identical secondary current ratings: 2A, 2A, and 3A (6.3V secondary)
• ROHS3 compliance and REACH unaffected status

Substitution Basis: The 291AEX maintains all critical secondary specifications and physical form factor of the 290AEX. The primary winding configuration differs—the 291AEX features dual primary windings with multiple taps supporting 100V, 110V, 120V, 210V, 220V, 230V, and 240V inputs, compared to the 290AEX single 240V primary. This expanded primary voltage range provides operational flexibility while preserving secondary output characteristics. The 291AEX is active product status, ensuring ongoing availability and supply chain support.

Parameter Comparison

Engineering Selection Recommendations

The 291AEX serves as the active equivalent for the obsolete 290AEX. Both transformers maintain identical secondary voltage and current specifications, physical dimensions, and regulatory compliance certifications. The 291AEX is currently in active production status with confirmed inventory availability of 1119 units.

For applications requiring 240V primary input, the 291AEX operates identically to the 290AEX on the 240V tap. The expanded primary voltage range of the 291AEX does not compromise performance in 240V-only applications and provides additional operational flexibility for future design modifications or equipment variations.

Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing and distribution requirements.

Frequently Asked Questions (FAQ)

Q: Can the 291AEX directly replace the 290AEX in existing equipment?

A: Yes. The 291AEX maintains identical secondary voltage outputs (650V, 6.3V, 5V), secondary current ratings, physical dimensions, mounting configuration, and termination style. For applications using 240V primary input, the 291AEX operates on its 240V tap with equivalent performance to the 290AEX.

Q: What is the primary difference between the 290AEX and 291AEX?

A: The 290AEX features a single 240V primary winding. The 291AEX features dual primary windings with multiple taps supporting 100V, 110V, 120V, 210V, 220V, 230V, and 240V inputs. Secondary specifications remain identical.

Q: Are there packaging differences between these transformers?

A: The 290AEX is supplied with standard packaging. The 291AEX is supplied in box packaging. Both maintain identical physical dimensions and mounting characteristics.

Q: Do both transformers meet current regulatory requirements?

A: Yes. Both the 290AEX and 291AEX are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component manufacturing and distribution.

Q: Why is the 290AEX classified as obsolete?

A: The 290AEX is no longer in active production. The 291AEX represents the current active equivalent, offering identical secondary specifications with expanded primary voltage flexibility and ongoing supply chain availability.