AH373-WL-7 Equivalent & Substitute Parts

Part Overview

The AH373-WL-7 is a digital switch latch Hall Effect magnetic sensor manufactured by Diodes Incorporated in SC-59-3 surface mount package. This component operates as an open drain output device with south pole polarization, designed for magnetic field detection applications requiring latch functionality. The part is currently obsolete, necessitating identification of functionally compatible alternatives from active product lines to maintain design continuity and ensure long-term supply availability.

Key Parameters

Parameter	AH373-WL-7
Manufacturer	Diodes Incorporated
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	6mT Trip, -6mT Release
Voltage Supply	2.2V – 20V
Current Supply (Max)	4mA
Current Output (Max)	25mA
Output Type	Open Drain
Operating Temperature	-40°C to 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AH373-WL-7 is determined by the following critical parameters:

Core Compatibility Criteria:

Hall Effect technology with open drain output
South pole polarization (or omnipolar capability)
Surface mount package compatibility (SOT-23-3 / SC-59 / TO-236-3)
Voltage supply range encompassing 2.2V – 20V minimum
Output current capability of 25mA or greater
Operating temperature range including -40°C to 125°C

Functional Consideration: The AH373-WL-7 operates as a latch function device. Texas Instruments DRV5023 and DRV5033 series components provide unipolar and omnipolar switch functions respectively. While these represent functional variations (switch vs. latch), they maintain electrical compatibility through identical package, output type, and core sensing technology, enabling circuit-level substitution where application logic accommodates the functional difference.

Parameter Comparison

Parameter	AH373-WL-7	DRV5023AJEDBZRQ1	DRV5023AJQDBZRQ1	DRV5023BIEDBZRQ1	DRV5023BIQDBZRQ1	DRV5033AJEDBZRQ1
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Function	Latch	Unipolar Switch	Unipolar Switch	Unipolar Switch	Unipolar Switch	Omnipolar Switch
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Polarization	South Pole	South Pole	South Pole	South Pole	South Pole	North Pole, South Pole
Sensing Range	6mT Trip, -6mT Release	12mT Trip, 1mT Release	12mT Trip, 1mT Release	24mT Trip, 3mT Release	24mT Trip, 3mT Release	±12mT Trip, ±1mT Release
Voltage Supply	2.2V – 20V	2.7V – 38V	2.7V – 38V	2.7V – 38V	2.7V – 38V	2.7V – 38V
Current Supply (Max)	4mA	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)
Current Output (Max)	25mA	30mA	30mA	30mA	30mA	30mA
Output Type	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain
Operating Temperature	-40°C to 125°C	-40°C to 150°C	-40°C to 150°C	-40°C to 150°C	-40°C to 125°C	-40°C to 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active
Grade	–	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	–	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Active Status):

DRV5023AJEDBZRQ1, DRV5023AJQDBZRQ1, DRV5023BIEDBZRQ1, and DRV5023BIQDBZRQ1 are active production parts from Texas Instruments with AEC-Q100 automotive qualification. These components provide extended voltage supply range (2.7V – 38V), improved output current capability (30mA), and superior temperature operating range (-40°C to 150°C for most variants). All maintain SOT-23-3 package compatibility and open drain output configuration.

Omnipolar Alternative:

DRV5033AJEDBZRQ1 offers omnipolar sensing capability (North Pole and South Pole detection) while maintaining identical electrical and package specifications. This variant provides additional application flexibility for designs requiring bidirectional magnetic field sensing.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance, REACH unaffected status, and AEC-Q100 qualification, meeting automotive and industrial regulatory requirements. The DRV5023 and DRV5033 series components feature MSL rating of 1 (Unlimited), providing superior moisture handling compared to the original AH373-WL-7 (MSL 3).

Frequently Asked Questions (FAQ)

Q: Can DRV5023 unipolar switch devices directly replace the AH373-WL-7 latch function?

A: Electrical and package compatibility is maintained. The functional difference between latch and switch operation requires circuit-level evaluation. Latch devices retain output state after magnetic field removal, while switch devices respond directly to field presence. Application logic must accommodate this behavioral difference.

Q: What is the significance of the higher sensing range in DRV5023B variants (24mT vs. 12mT)?

A: Sensing range determines magnetic field strength required for device activation. DRV5023B variants require stronger magnetic fields (24mT trip threshold) compared to DRV5023A variants (12mT trip threshold). Selection depends on the magnetic field strength available in the application environment.

Q: Why do some substitute parts list operating temperature to 150°C while the original operates to 125°C?

A: Extended temperature range represents improved device capability. Applications operating within the original -40°C to 125°C specification remain fully compatible. The extended range provides design margin for thermal stress conditions.

Q: Is the DRV5033 omnipolar variant suitable for applications originally designed for south pole only sensing?

A: Yes. Omnipolar devices detect both north and south pole magnetic fields. Applications requiring south pole detection only will function correctly with omnipolar substitutes, with the additional capability remaining unused.

Q: What packaging options are available for the DRV5023 and DRV5033 series?

A: All recommended substitutes are available in SOT-23-3 surface mount package with identical pinout and footprint compatibility. Packaging variants include Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) options for different procurement and assembly workflows.

Q: Are there supply chain advantages to selecting active status parts over obsolete alternatives?

A: Active production status ensures long-term availability, consistent manufacturing quality, and established supply chain infrastructure. Obsolete parts face discontinuation risk and limited inventory depth, making active alternatives preferable for new designs and long-term production requirements.

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