AH337-PL-A Equivalent & Substitute Parts

Part Overview

The AH337-PL-A is a unipolar Hall Effect magnetic switch manufactured by Diodes Incorporated in a 3-SIP package configuration. This digital switch operates with open drain output and is designed for magnetic field detection applications requiring South Pole polarization. The part is currently obsolete, making equivalent substitute components necessary for ongoing system support and new design implementations. Active alternatives from Allegro MicroSystems and Infineon Technologies provide functional equivalence with enhanced specifications and extended availability.

Key Parameters

Parameter	AH337-PL-A
Manufacturer	Diodes Incorporated
Function	Unipolar Switch
Technology	Hall Effect
Polarization	South Pole
Output Type	Open Drain
Sensing Range (Trip/Release)	15mT / 3mT
Voltage Supply	4.2V ~ 28V
Current Supply (Max)	4mA
Current Output (Max)	25mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package	3-SIP, Formed Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AH337-PL-A is determined by the following critical parameters:

Core Compatibility Requirements:

Function: Unipolar Switch
Technology: Hall Effect
Polarization: South Pole
Output Type: Open Drain
Mounting Type: Through Hole
Package Type: 3-SIP configuration

Electrical Compatibility Criteria:

Voltage Supply range must encompass or overlap with 4.2V ~ 28V
Current Output (Max) must be ≥ 25mA
Sensing Range (Trip threshold) must be compatible with application requirements

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected status

The substitute parts are grouped into two categories based on sensing range characteristics:

Group 1 - Low Sensitivity (5mT Trip): A1120EUA-T, A1120LUA-T Group 2 - Medium Sensitivity (17.5mT ~ 24.5mT Trip): A1101EUA-T, A1101LUA-T, A1102EUA-T, A1102LUA-T Group 3 - High Sensitivity (35.5mT ~ 45mT Trip): A1103LUA-T, A1104EUA-T, A1104LUA-T Group 4 - Specialized (PWM Output, Automotive Grade): TLE4998C3XALA1

Parameter Comparison

Part Number	Manufacturer	Function	Technology	Polarization	Output Type	Sensing Range (Trip/Release)	Voltage Supply	Current Supply (Max)	Current Output (Max)	Operating Temperature	Package	Product Status
AH337-PL-A	Diodes Incorporated	Unipolar Switch	Hall Effect	South Pole	Open Drain	15mT / 3mT	4.2V ~ 28V	4mA	25mA	-40°C ~ 125°C	3-SIP	Obsolete
A1101EUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	17.5mT / 1mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 85°C	3-SSIP	Active
A1101LUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	17.5mT / 1mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 150°C	3-SSIP	Active
A1102EUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	24.5mT / 6mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 85°C	3-SSIP	Active
A1102LUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	24.5mT / 6mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 150°C	3-SSIP	Active
A1103LUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	35.5mT / 15mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 150°C	3-SSIP	Active
A1104EUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	45mT / 2.5mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 85°C	3-SSIP	Active
A1104LUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	45mT / 2.5mT	3.8V ~ 24V	7.5mA	25mA	-40°C ~ 150°C	3-SSIP	Active
A1120EUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	5mT / 0.5mT	3V ~ 24V	4mA	25mA	-40°C ~ 85°C	3-SSIP	Active
A1120LUA-T	Allegro MicroSystems	Unipolar Switch	Hall Effect	South Pole	Open Drain	5mT / 0.5mT	3V ~ 24V	4mA	25mA	-40°C ~ 150°C	3-SSIP	Active

Engineering Selection Recommendations

For Standard Operating Conditions (-40°C to 85°C):

Select A1120EUA-T or A1101EUA-T for applications requiring active product status with standard temperature range support. A1120EUA-T provides the lowest sensing threshold (5mT trip) with current supply matching the original specification (4mA). A1101EUA-T offers medium sensitivity (17.5mT trip) with higher current supply capability (7.5mA).

For Extended Temperature Range (-40°C to 150°C):

A1120LUA-T, A1101LUA-T, A1102LUA-T, A1103LUA-T, and A1104LUA-T all support extended operating temperature ranges. Selection depends on required sensing range: A1120LUA-T for low sensitivity applications, A1101LUA-T or A1102LUA-T for medium sensitivity, A1103LUA-T or A1104LUA-T for high sensitivity requirements.

For Automotive Applications:

A1120EUA-T and A1120LUA-T carry AEC-Q100 automotive qualification and automotive grade designation, suitable for automotive magnetic switch applications.

Voltage Supply Consideration:

The original AH337-PL-A supports 4.2V ~ 28V supply range. Allegro MicroSystems substitutes support 3.8V ~ 24V or 3V ~ 24V ranges. Applications requiring supply voltages above 24V require design review for compatibility.

All substitute parts maintain:

RoHS3 compliance
REACH unaffected status
Open drain output configuration
South Pole polarization
Through hole mounting
25mA maximum output current
3-SIP/3-SSIP package compatibility

Frequently Asked Questions (FAQ)

Q: Can A1120EUA-T directly replace AH337-PL-A in existing designs?

A: A1120EUA-T is functionally compatible as a direct replacement for standard temperature range applications (-40°C to 85°C). Both parts feature open drain output, South Pole polarization, and 3-SIP package configuration. The primary difference is sensing range: A1120EUA-T operates at 5mT trip threshold versus AH337-PL-A at 15mT. Verify application magnetic field strength requirements before substitution.

Q: What is the difference between EUA and LUA suffix variants?

A: The suffix designates operating temperature range. EUA variants support -40°C to 85°C operating temperature. LUA variants support extended range -40°C to 150°C. Select based on application thermal requirements.

Q: Are Allegro MicroSystems A110x series parts pin-compatible with AH337-PL-A?

A: Both use 3-SIP package configuration with through hole mounting. Pin compatibility requires verification of specific pinout assignments in application schematics, as package designation alone does not guarantee identical pin ordering.

Q: Why does AH337-PL-A support 28V maximum supply while substitutes support only 24V?

A: Allegro MicroSystems substitutes specify 24V maximum supply voltage. Applications requiring operation above 24V require alternative component selection or circuit redesign to operate within 24V maximum specification.

Q: Is TLE4998C3XALA1 a suitable substitute for AH337-PL-A?

A: TLE4998C3XALA1 is not a direct substitute. While both are Hall Effect sensors, TLE4998C3XALA1 features PWM output rather than open drain digital switch output, different package type (SSO-3-10), and different sensing range specifications (±50mT to ±200mT selectable). This part is suitable only for applications requiring PWM output functionality.

Q: What inventory status should be considered for production planning?

A: AH337-PL-A is obsolete with 809 units available. Allegro MicroSystems substitutes are active products with inventory ranging from 19,730 to 58,250 units, providing long-term supply security for new designs and ongoing production support.

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