ACS755LCB-050-PFF Current Sensor Equivalent & Substitute Parts

Part Overview

The ACS755LCB-050-PFF is a Hall Effect open loop current sensor manufactured by Allegro MicroSystems, designed for bidirectional DC current measurement up to 50A. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The sensor provides ratiometric voltage output with 40mV/A sensitivity and operates across industrial temperature ranges from -40°C to 150°C.

Substiute Parts

ACS755LCB-050-PFF

Allegro MicroSystemsIn Stock: 1558ACS755LCB-050-PFF Datasheet

Current PartRFQ

ACS758LCB-050U-PFF-T

Allegro MicroSystemsIn Stock: 22129ACS758LCB-050U-PFF-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ACS755LCB-050-PFF is determined by the following critical parameters:

Primary Substitution Criteria:

• Current sensing capacity: 50A
• Package type: 5-CB Formed Leads, PFF (Through Hole)
• Sensor technology: Hall Effect, Open Loop
• Output configuration: Ratiometric, Voltage
• Operating temperature range: -40°C ~ 150°C minimum
• Supply voltage compatibility: 5V operation or wider range including 5V

Secondary Compatibility Factors:

• Frequency response capability
• Sensitivity (mV/A)
• Response time
• Linearity and accuracy specifications
• Product status (Active preferred for new designs)

The ACS758LCB-050U-PFF-T qualifies as a direct substitute based on matching the primary criteria, though with notable differences in polarization (unidirectional vs. bidirectional) and enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The ACS758LCB-050U-PFF-T is the qualified substitute for the obsolete ACS755LCB-050-PFF. Both components share identical package geometry (5-CB Formed Leads, PFF), current sensing capacity (50A), and operating temperature range (-40°C ~ 150°C), ensuring mechanical and thermal compatibility.

The substitute part offers active product status, which is critical for long-term supply chain reliability and design continuity. The ACS758LCB-050U-PFF-T includes AEC-Q100 automotive qualification, providing additional compliance assurance for applications requiring automotive-grade components.

Key differences exist in polarization mode: the original part operates bidirectionally, while the substitute is unidirectional. This distinction is fundamental to circuit design and must be evaluated against application requirements. The substitute demonstrates improved performance metrics including higher sensitivity (60mV/A vs. 40mV/A), faster response time (4µs vs. 12µs), and extended frequency capability (DC ~ 120kHz vs. DC ~ 35kHz).

Both components maintain ROHS3 compliance and identical electrical supply voltage compatibility at 5V nominal operation, with the substitute offering wider supply voltage tolerance (3V ~ 5.5V).

Frequently Asked Questions (FAQ)

Q: Can the ACS758LCB-050U-PFF-T directly replace the ACS755LCB-050-PFF in existing designs?

A: Physical and thermal compatibility is confirmed due to identical package type (5-CB Formed Leads, PFF) and operating temperature range. However, the polarization difference (unidirectional vs. bidirectional) requires circuit evaluation. If the original design requires bidirectional current measurement, the substitute's unidirectional operation may not be suitable without circuit modification.

Q: What is the significance of the polarization difference?

A: The ACS755LCB-050-PFF measures current flow in both directions (bidirectional), while the ACS758LCB-050U-PFF-T measures current in one direction only (unidirectional). Applications requiring measurement of current reversal or AC components must retain bidirectional capability or redesign the measurement circuit.

Q: Why is the substitute part listed as Active while the original is Obsolete?

A: Product status reflects manufacturer support and availability. Active status indicates the ACS758LCB-050U-PFF-T is in current production with ongoing supply chain support, making it suitable for new designs and long-term production runs. The obsolete status of the original part indicates discontinued manufacturing.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant. The substitute includes AEC-Q100 automotive qualification, which the original part does not specify. This qualification is relevant only for applications requiring automotive-grade component certification.

Q: How do the sensitivity specifications affect circuit design?

A: The substitute provides 60mV/A sensitivity compared to the original 40mV/A. This higher sensitivity produces larger output voltage changes per ampere of measured current, potentially improving measurement resolution in signal conditioning circuits. Existing analog-to-digital converter scaling and calibration values may require adjustment.

Q: What packaging format is used for these components?

A: Both parts use 5-CB Formed Leads with PFF (plastic formed leads) package type, designed for through-hole PCB mounting. The substitute is supplied in Tube packaging, while original inventory information specifies the same package configuration.