A1172ECGLT Equivalent & Substitute Parts

Part Overview

The A1172ECGLT is an omnipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems, housed in a 4-WLCSP (0.96x0.96) package. This component functions as a digital switch with push-pull output, capable of detecting both north and south magnetic poles. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design requirements and production continuity. Substitute components must maintain functional compatibility across sensing range, voltage supply, output characteristics, and thermal operating conditions.

Substiute Parts

A1172ECGLT

Allegro MicroSystemsIn Stock: 44587A1172ECGLT Datasheet

Current PartRFQ

A1171EEWLT-P

Allegro MicroSystemsIn Stock: 1504A1171EEWLT-P Datasheet

MFR RecommendedRFQ

BU52054GWZ-E2

Rohm SemiconductorIn Stock: 77170BU52054GWZ-E2 Datasheet

MFR RecommendedRFQ

BU52055GWZ-E2

Rohm SemiconductorIn Stock: 34135BU52055GWZ-E2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A1172ECGLT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Hall Effect technology with omnipolar switching capability
• Push-pull output configuration
• Voltage supply range overlap with 1.65V ~ 4.6V
• Operating temperature range of -40°C ~ 85°C
• Surface mount packaging
• ROHS3 compliance and MSL 1 rating

Secondary Compatibility Considerations:

• Sensing range (trip and release thresholds) must be compatible with application requirements
• Supply current and output current specifications must not exceed system design limits
• Package footprint differences require PCB layout evaluation

The three substitute parts listed below meet the primary compatibility criteria and represent active product alternatives from established manufacturers.

Parameter Comparison

Engineering Selection Recommendations

A1171EEWLT-P (Allegro MicroSystems)

This substitute maintains identical voltage supply and current specifications to the A1172ECGLT while offering active product status. The 6-DFN/MLP package requires PCB layout modification compared to the original 4-WLCSP footprint. The A1171EEWLT-P provides programmable function capability and supports both omnipolar and unipolar switching modes. Release threshold of ±0.6mT differs significantly from the original ±6mT specification and must be evaluated against application hysteresis requirements.

BU52054GWZ-E2 (Rohm Semiconductor)

This Rohm component offers substantially lower supply current (8µA versus 2mA), providing power efficiency advantages in battery-operated applications. The UCSP35L1 package maintains a compact form factor comparable to the original 4-WLCSP. Trip threshold of ±7.9mT and release threshold of ±4.6mT differ from the original specification. Output current is reduced to 500µA. Voltage supply range extends to 3.6V, providing marginal additional headroom.

BU52055GWZ-E2 (Rohm Semiconductor)

This Rohm alternative matches the original trip threshold of ±5.5mT while offering the same power efficiency benefits as the BU52054GWZ-E2 (8µA supply current). The UCSP35L1 package and extended voltage range to 3.6V are identical to the BU52054GWZ-E2. Release threshold of ±1.5mT provides intermediate hysteresis between the original specification and the BU52054GWZ-E2. Output current specification remains at 500µA.

All three substitutes maintain ROHS3 compliance, MSL 1 rating, and -40°C ~ 85°C operating temperature range, ensuring regulatory and environmental compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can the A1171EEWLT-P be used as a direct replacement without PCB modification?

A: No. The A1171EEWLT-P uses a 6-DFN/MLP (1.5x2) package compared to the original 4-WLCSP (0.96x0.96) package. PCB footprint and layout changes are required. However, electrical functionality and voltage/current specifications are compatible.

Q: What is the primary advantage of the Rohm BU52054GWZ-E2 and BU52055GWZ-E2 substitutes?

A: Both Rohm components operate at 8µA supply current, compared to 2mA for the original A1172ECGLT. This represents a 250-fold reduction in supply current, providing significant power consumption benefits in low-power applications. Both maintain the same compact UCSP35L1 package footprint.

Q: How do the sensing range specifications differ between substitutes?

A: The original A1172ECGLT has a trip threshold of ±5.5mT and release threshold of ±6mT. The A1171EEWLT-P matches the trip threshold but reduces release threshold to ±0.6mT. The BU52054GWZ-E2 increases trip threshold to ±7.9mT with release at ±4.6mT. The BU52055GWZ-E2 matches the original trip threshold of ±5.5mT with release at ±1.5mT. Application requirements determine which sensing range is appropriate.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All three substitute parts (A1171EEWLT-P, BU52054GWZ-E2, and BU52055GWZ-E2) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original component's regulatory status.

Q: What is the output current difference between the original and Rohm substitutes?

A: The original A1172ECGLT specifies 1mA maximum output current. Both Rohm substitutes (BU52054GWZ-E2 and BU52055GWZ-E2) specify 500µA maximum output current. This reduction must be verified against load requirements in the application circuit.

Q: Which substitute is closest to the original A1172ECGLT specification?

A: The A1171EEWLT-P from Allegro MicroSystems maintains identical voltage supply (1.65V ~ 4.6V) and current specifications (2mA supply, 1mA output) to the original. However, it requires package footprint changes. The BU52055GWZ-E2 matches the original trip threshold of ±5.5mT while offering power efficiency benefits, but with reduced output current and different package.

Q: Can the substitutes be used interchangeably in the same PCB design?

A: No. The A1171EEWLT-P requires different PCB footprint (6-DFN versus 4-WLCSP). The Rohm components use the UCSP35L1 package, which differs from both the original and the Allegro substitute. Each substitute requires individual PCB layout evaluation and validation.