AH175-PL-A-A Equivalent & Substitute Parts

Part Overview

The AH175-PL-A-A is a digital switch latch Hall Effect magnetic sensor manufactured by Diodes Incorporated in a 3-SIP package configuration. This component functions as an open collector output device with temperature compensation, designed for magnetic field detection and switching applications. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for ongoing system support and new designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	AH175-PL-A-A
Manufacturer	Diodes Incorporated
Category	Magnetic Sensors
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	6mT Trip, -6mT Release
Voltage - Supply	4.6V ~ 20V
Current - Supply (Max)	6mA
Current - Output (Max)	25mA
Output Type	Open Collector
Operating Temperature	-40°C ~ 150°C (TA)
Mounting Type	Through Hole
Package / Case	3-SIP, Formed Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AH175-PL-A-A is determined by the following critical parameters:

Functional Equivalence Requirements:

Hall Effect technology with latch function
South pole polarization
Open collector output configuration
Through hole mounting capability

Electrical Compatibility Parameters:

Supply voltage range must encompass or overlap the 4.6V ~ 20V specification
Output current capability must meet or exceed 25mA maximum
Sensing range (trip/release thresholds) must be compatible with application requirements
Operating temperature range must support the -40°C ~ 150°C requirement or application-specific subset

Package Compatibility:

Original 3-SIP package with formed leads; alternative packages (TO-92-3, SSO-3-2) are acceptable if pin configuration and lead spacing accommodate board layout

The substitute parts identified maintain Hall Effect latch functionality with open collector outputs and through hole mounting. Variations in sensing range thresholds, supply current specifications, and operating temperature ranges reflect different sensor sensitivity grades and thermal performance classes within the same functional family.

Parameter Comparison

Parameter	AH175-PL-A-A	AH175-PG-A-A	OHS3075U	OHS3175U	OHS3177U	OMH3075B	OMH3075S	TLE4935LHALA1
Manufacturer	Diodes Inc.	Diodes Inc.	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	Infineon
Function	Latch	Latch	Latch	Latch	Latch	Latch	Latch	Latch
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Polarization	South Pole	South Pole	South Pole	South Pole	South Pole	South Pole	South Pole	South Pole
Sensing Range (Trip/Release)	6mT / -6mT	6mT / -6mT	25mT / -25mT	26mT / -26mT	20mT / -20mT	27.5mT / -27.5mT	27.5mT / -27.5mT	20mT / -20mT
Voltage - Supply	4.6V ~ 20V	4.6V ~ 20V	4.5V ~ 24V	4.5V ~ 24V	4.5V ~ 24V	4.5V ~ 24V	4.5V ~ 24V	3.8V ~ 24V
Current - Supply (Max)	6mA	6mA	7mA	7mA	7mA	11mA	11mA	8mA
Current - Output (Max)	25mA	25mA	25mA	25mA	25mA	25mA	25mA	100mA
Output Type	Open Collector	Open Collector	Open Collector	Open Collector	Open Collector	Open Collector	Open Collector	Open Collector
Operating Temperature	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 150°C
Package / Case	3-SIP, Formed Leads	3-SIP, Formed Leads	3-SSIP (TO-92-3)	3-SSIP (TO-92-3)	3-SSIP (TO-92-3)	3-SSIP (TO-92-3)	3-SSIP (TO-92-3)	3-SSIP, SSO-3-02
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: AH175-PG-A-A

The AH175-PG-A-A from Diodes Incorporated is the direct functional equivalent with identical electrical specifications and sensing range. This part maintains the same 4.6V ~ 20V supply voltage, 6mT trip threshold, and -40°C ~ 150°C operating temperature range as the obsolete AH175-PL-A-A. The part is currently in active production status with substantial inventory availability (191,822 units), ensuring long-term supply continuity. Both parts are ROHS3 compliant and share the same base product number (AH175), confirming design compatibility.

Secondary Recommendations for Sensing Range Variations:

OHS3177U and TLE4935LHALA1 are suitable alternatives when the application can accommodate a 20mT trip threshold instead of 6mT. Both maintain open collector output, through hole mounting, and ROHS3 compliance. The TLE4935LHALA1 offers extended output current capability (100mA versus 25mA) and temperature compensation features, with automotive-grade qualification (AEC-Q100). However, this part is classified as Last Time Buy, limiting future availability.

OMH3075B and OMH3075S provide extended operating temperature range (-55°C ~ 125°C) suitable for harsh environment applications, though they require higher supply current (11mA maximum) and feature a 27.5mT trip threshold.

Substitution Constraints:

Applications requiring the original 6mT sensing sensitivity must use AH175-PG-A-A. Designs tolerant of higher trip thresholds (20mT or higher) may select from the OHS and OMH series. Package transitions from 3-SIP to TO-92-3 or SSO-3-2 require board layout verification to confirm pin spacing and lead configuration compatibility.

Frequently Asked Questions (FAQ)

Q: Can OHS3075U directly replace AH175-PL-A-A in existing designs?

A: OHS3075U maintains functional equivalence as a Hall Effect latch with open collector output and through hole mounting. However, the sensing range differs significantly: OHS3075U operates at 25mT trip threshold versus 6mT for AH175-PL-A-A. Direct substitution is only valid if the application can function with the higher sensitivity threshold. Package transition from 3-SIP to TO-92-3 requires board layout verification.

Q: What is the difference between OMH3075B and OMH3075S?

A: Both parts share identical electrical specifications and sensing range (27.5mT trip, -27.5mT release). The primary distinction is packaging: OMH3075B and OMH3075S both use TO-92-3 package with 3-SSIP configuration. Both support extended operating temperature range (-55°C ~ 125°C) and are suitable for industrial and automotive applications requiring thermal robustness.

Q: Is TLE4935LHALA1 suitable for new designs?

A: TLE4935LHALA1 is classified as Last Time Buy, indicating Infineon has announced end-of-life status. While currently available (2,200 units in stock), this part should not be selected for new long-term production designs. The part does offer advantages including temperature compensation, automotive qualification (AEC-Q100), and higher output current (100mA), but supply will eventually cease.

Q: What supply voltage range is common across all substitutes?

A: The minimum common supply voltage range is 4.5V ~ 20V. The original AH175-PL-A-A and its direct equivalent AH175-PG-A-A support 4.6V minimum, while all TT Electronics/Optek and Infineon alternatives require 4.5V minimum. Applications operating below 4.5V must use AH175-PG-A-A.

Q: Can I use OHS3175U instead of OHS3177U?

A: Both parts are functionally equivalent with identical electrical specifications and package configuration (TO-92-3, 3-SSIP). The sensing range differs slightly: OHS3175U operates at 26mT trip threshold while OHS3177U operates at 20mT. Selection depends on application sensitivity requirements. OHS3177U is closer to the original 6mT specification when higher sensitivity is needed within the OHS series.

Q: What are the package compatibility considerations?

A: The original AH175-PL-A-A uses 3-SIP package with formed leads. Direct equivalent AH175-PG-A-A maintains this package. All TT Electronics/Optek alternatives (OHS and OMH series) use TO-92-3 package (3-SSIP configuration), and TLE4935LHALA1 uses SSO-3-2 package. While all are through hole mounting, physical lead spacing and board hole patterns must be verified before substitution to ensure mechanical fit and electrical connectivity.

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