HAL504UA-A Equivalent & Substitute Parts

Part Overview

The HAL504UA-A is a unipolar Hall effect magnetic switch manufactured by TDK-Micronas GmbH, designed for digital switching applications with open drain output. This component operates across a wide supply voltage range (3.8V to 24V) and features temperature compensation for stable performance in industrial environments. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Substiute Parts

HAL504UA-A

TDK-Micronas GmbHIn Stock: 832HAL504UA-A Datasheet

Current PartRFQ

US5781LUA-AAA-000-BU

Melexis Technologies NVIn Stock: 3734US5781LUA-AAA-000-BU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HAL504UA-A is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Function: Unipolar Switch (digital switching operation)
• Technology: Hall Effect (magnetic sensing principle)
• Polarization: South Pole (magnetic field orientation)
• Output Type: Open Drain (signal interface)
• Mounting Type: Through Hole (physical installation method)
• Package / Case: TO-92-3 compatible form factor

Allowable Parameter Variations:

• Sensing Range: Trip and release thresholds may vary within application tolerance
• Voltage - Supply: Substitute must support the required operating voltage window
• Current - Supply (Max): Substitute specifications must meet or exceed application requirements
• Current - Output (Max): Substitute must provide sufficient output current capability
• Operating Temperature: Substitute range must encompass application requirements

The US5781LUA-AAA-000-BU qualifies as a substitute based on matching all critical criteria while maintaining functional compatibility within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The HAL504UA-A is classified as obsolete. The US5781LUA-AAA-000-BU is an active product with current manufacturing support and documented availability (3689 pcs in stock versus 731 pcs for the original part). This status difference supports transition to the substitute for new designs and ongoing system support.

Compliance & Certification: Both parts meet RoHS requirements. The US5781LUA-AAA-000-BU carries ROHS3 compliance and REACH Unaffected status, providing additional regulatory documentation for applications requiring enhanced compliance verification.

Parameter Alignment for Substitution: The substitute part maintains functional equivalence across all critical parameters: unipolar Hall effect switching with open drain output, through-hole mounting in TO-92-3 package, and south pole polarization. The sensing range variation (15mT trip vs. 14.5mT trip) represents a 3.4% difference in trip threshold, which falls within typical application tolerance windows for magnetic switch applications.

Operational Constraints: Applications requiring operation above 150°C (junction temperature) cannot use the US5781LUA-AAA-000-BU, as its maximum operating temperature is 150°C (ambient) versus the original part's 170°C (junction). Applications with strict output current requirements below 20mA should verify that the substitute's higher output current capability (50mA maximum) does not introduce circuit compatibility issues.

Frequently Asked Questions (FAQ)

Q: Can the US5781LUA-AAA-000-BU be used as a direct replacement for the HAL504UA-A in existing designs?

A: Yes, for applications operating within the specified parameter ranges. The substitute maintains identical function (unipolar Hall effect switch), output type (open drain), polarization (south pole), and package form factor (TO-92-3). Verify that your application's operating temperature does not exceed 150°C and that the sensing range variation (15mT trip vs. 14.5mT trip) is acceptable for your magnetic field detection requirements.

Q: What is the significance of the sensing range difference between these parts?

A: The HAL504UA-A has a 14.5mT trip threshold and 5mT release threshold. The US5781LUA-AAA-000-BU has a 15mT trip threshold and 4.6mT release threshold. The trip threshold difference is 3.4%, which is typically within acceptable tolerance for magnetic switch applications. The release threshold differs by 30%, which may affect hysteresis behavior in applications with marginal magnetic field margins. Evaluate your specific magnetic field environment to confirm compatibility.

Q: Are there package compatibility concerns between these parts?

A: Both parts use TO-92-3 package form factor with through-hole mounting. The US5781LUA-AAA-000-BU is specified as "Short Body" variant, while the HAL504UA-A uses "Formed Leads" configuration. Both are compatible with standard TO-92-3 PCB footprints. Verify physical clearance in your specific board layout, particularly if space constraints exist around the component.

Q: Why does the substitute require higher supply current (5mA vs. 4.2mA)?

A: The US5781LUA-AAA-000-BU has a maximum supply current specification of 5mA compared to the original part's 4.2mA. This 19% increase reflects differences in internal circuit design between manufacturers. Verify that your power supply and current-limiting circuitry can accommodate this higher current draw without affecting system performance.

Q: What compliance advantages does the US5781LUA-AAA-000-BU provide?

A: The substitute carries ROHS3 compliance and REACH Unaffected status, providing enhanced regulatory documentation. Both parts meet RoHS requirements and have MSL 1 (Unlimited) moisture sensitivity rating. For applications requiring detailed compliance verification, the substitute's active product status and current manufacturing support provide better long-term documentation availability.

Q: Can the US5781LUA-AAA-000-BU be used in high-temperature applications above 150°C?

A: No. The US5781LUA-AAA-000-BU has a maximum operating temperature of 150°C (ambient), while the original HAL504UA-A operates to 170°C (junction temperature). For applications requiring operation above 150°C, the original part specification must be maintained or alternative components with higher temperature ratings must be identified.