A3245LLHLT Equivalent & Substitute Parts

Part Overview

The A3245LLHLT is an omnipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This component functions as a digital switch with open drain output, designed to detect magnetic fields from both north and south poles. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching Hall Effect technology, omnipolar sensing capability, and open drain output characteristics.

Key Parameters

Parameter	A3245LLHLT
Manufacturer	Allegro MicroSystems
Function	Omnipolar Switch
Technology	Hall Effect
Output Type	Open Drain
Sensing Range (Trip/Release)	±5.5mT / ±0.5mT
Voltage Supply	3.6V – 24V
Current Supply (Max)	4.6mA
Current Output (Max)	60mA
Operating Temperature	-40°C to 150°C
Mounting Type	Surface Mount
Package	SOT-23W
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution of the A3245LLHLT requires matching the following core electrical and mechanical parameters:

Primary Substitution Criteria:

Function: Omnipolar Switch (detects both north and south pole magnetic fields)
Technology: Hall Effect
Output Type: Open Drain (required for direct pin compatibility)
Mounting Type: Surface Mount
Package Compatibility: SOT-23W or equivalent three-pin surface mount packages (SC-59, TO-236-3)

Secondary Compatibility Parameters:

Voltage Supply Range: Must overlap with 3.6V – 24V operating window
Sensing Range: Trip and release thresholds must be compatible with application requirements
Operating Temperature: Must support -40°C to 150°C range or application-specific subset
Current Ratings: Supply and output current must meet circuit requirements

The substitute parts listed below meet the primary criteria of omnipolar Hall Effect open drain switches in compatible surface mount packages. Variations in sensing range, voltage supply limits, and current consumption reflect different manufacturer implementations while maintaining functional equivalence for omnipolar magnetic detection applications.

Parameter Comparison

Parameter	A3245LLHLT	AH180-WG-7-P	AH1806-W-7	AH1808-W-7	SL353HT	TLE4913HTSA1
Manufacturer	Allegro MicroSystems	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Honeywell	Infineon Technologies
Function	Omnipolar Switch	Omnipolar Switch	Omnipolar Switch	Omnipolar Switch	Omnipolar Switch	Omnipolar Switch
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Output Type	Open Drain	Open Drain	Open Drain	Open Drain	Push-Pull	Open Drain
Sensing Range Trip (mT)	±5.5	±6	±4.5	±6	±11	±5
Sensing Range Release (mT)	±0.5	±1	±4	±5	±9.5	±4.2
Voltage Supply Range	3.6V – 24V	2.5V – 5.5V	2.5V – 5.5V	2.5V – 5.5V	2.2V – 5.5V	2.4V – 5.5V
Current Supply (Max)	4.6mA	16µA	16µA	16µA	640µA	2.5mA
Current Output (Max)	60mA	—	2.5mA	2.5mA	5mA	2mA
Operating Temperature	-40°C to 150°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-23W	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
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Product Status Consideration: All substitute parts listed are in active production status, ensuring long-term availability and supply chain stability. The A3245LLHLT obsolete status necessitates migration to one of these active alternatives.

Compliance and Certifications: All substitute parts are RoHS compliant (ROHS3 or equivalent), meeting current environmental and regulatory requirements. The original A3245LLHLT is RoHS non-compliant, making substitution advisable for new designs and regulatory compliance.

Output Type Compatibility: Five of the six substitute parts (AH180-WG-7-P, AH1806-W-7, AH1808-W-7, and TLE4913HTSA1) maintain open drain output matching the A3245LLHLT. The SL353HT features push-pull output, which requires circuit-level evaluation for compatibility with existing pull-up resistor configurations.

Voltage Supply Range Limitation: The A3245LLHLT operates across 3.6V – 24V, while all substitute parts operate within 2.2V – 5.5V maximum. Applications requiring supply voltages above 5.5V cannot use these substitutes without additional voltage regulation circuitry.

Temperature Range Consideration: The A3245LLHLT supports -40°C to 150°C operation. All substitute parts are rated to -40°C to 85°C maximum. Applications requiring operation above 85°C cannot use these substitutes.

Current Output Capability: The A3245LLHLT provides 60mA maximum output current. Substitute parts provide significantly lower output current (2mA to 5mA), requiring circuit redesign if high-current switching is required.

Sensing Range Variations: Substitute parts exhibit different trip and release thresholds. AH1806-W-7 and SL353HT have wider hysteresis windows, while AH180-WG-7-P and AH1808-W-7 provide tighter sensing ranges closer to the original specification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace A3245LLHLT with any of these substitute parts?

A: Direct pin-compatible replacement is possible only if your application operates within the voltage range of 2.2V – 5.5V and does not exceed 85°C operating temperature. The A3245LLHLT supports higher voltage (up to 24V) and temperature (up to 150°C), so substitutes are not suitable for applications requiring these extended ranges. Five of the six substitutes maintain open drain output for direct circuit compatibility; SL353HT uses push-pull output and requires circuit evaluation.

Q: What is the key difference between open drain and push-pull output?

A: Open drain output requires an external pull-up resistor to establish a high logic level and can only pull the output low. Push-pull output actively drives both high and low logic levels without requiring external pull-up resistors. If your circuit uses a pull-up resistor with the A3245LLHLT, the SL353HT push-pull output will function but may exhibit different switching characteristics.

Q: Why do the substitute parts have lower maximum output current than the A3245LLHLT?

A: The A3245LLHLT is rated for 60mA output current, while substitutes provide 2mA to 5mA. This reflects different design approaches and target applications. If your circuit requires 60mA switching capability, these substitutes cannot be used without additional output driver circuitry.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are RoHS compliant (ROHS3 or equivalent), while the original A3245LLHLT is RoHS non-compliant. This makes substitution necessary for applications subject to RoHS regulations.

Q: What is the difference between the three Diodes Incorporated parts (AH180-WG-7-P, AH1806-W-7, AH1808-W-7)?

A: All three are omnipolar Hall Effect open drain switches from Diodes Incorporated in compatible SC-59-3 packages. Primary differences are sensing range thresholds (AH180-WG-7-P and AH1808-W-7 at ±6mT trip vs. AH1806-W-7 at ±4.5mT trip) and packaging format (cut tape, digi-reel, or tape & reel). Selection depends on your specific sensing threshold requirements and procurement format preference.

Q: Can I use these substitutes in automotive applications?

A: The TLE4913HTSA1 from Infineon is specifically qualified for automotive use (AEC-Q100 grade) and includes temperature compensation. Other substitutes are not designated for automotive applications. If automotive qualification is required, TLE4913HTSA1 is the appropriate choice.

Q: What happens if my application requires operation above 85°C?

A: None of the substitute parts are rated above 85°C operating temperature. The A3245LLHLT supports up to 150°C. If your application requires higher temperature operation, these substitutes are not suitable, and alternative component families must be evaluated.

Q: How do I handle the voltage supply range difference?

A: The A3245LLHLT operates from 3.6V to 24V, while substitutes operate from 2.2V to 5.5V maximum. If your circuit supplies voltage above 5.5V, you must add a voltage regulator to step down the supply to the substitute part's maximum rating. Alternatively, if your application can operate at lower voltage, direct substitution is possible.

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