A3245LLHLT-T Equivalent & Substitute Parts

Part Overview

The A3245LLHLT-T is an omnipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This digital switch operates as an open drain output device with a sensing range of ±5.5mT trip and ±0.5mT release across a wide supply voltage range of 3.6V to 24V and operating temperature range of -40°C to 150°C. The product is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	A3245LLHLT-T
Manufacturer	Allegro MicroSystems
Function	Omnipolar Switch
Technology	Hall Effect
Output Type	Open Drain
Polarization	North Pole, South Pole
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 ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOT-23W
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the A3245LLHLT-T is determined by the following critical parameters:

Functional Requirements:

Omnipolar Hall Effect switch technology
Open drain output configuration
North and South pole detection capability

Electrical Compatibility:

Supply voltage range overlap with 3.6V ~ 24V specification
Output current capability sufficient for 60mA maximum
Supply current within acceptable limits

Environmental & Mechanical:

Surface mount packaging in compatible form factors
Operating temperature range compatibility
RoHS3 compliance and MSL rating

Sensing Performance:

Trip and release thresholds within acceptable tolerance bands for the application

The substitute parts listed below maintain these core functional and electrical characteristics while offering active product status and current availability.

Parameter Comparison

Parameter	A3245LLHLT-T	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
Polarization	North Pole, South Pole	North Pole, South Pole	North Pole, South Pole	North Pole, South Pole	North Pole, South Pole	North Pole, South Pole
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 (V)	3.6 ~ 24	2.5 ~ 5.5	2.5 ~ 5.5	2.5 ~ 5.5	2.2 ~ 5.5	2.4 ~ 5.5
Current - Supply (Max)	4.6mA	16µA	16µA	16µA	640µA	2.5mA
Current - Output (Max)	60mA	—	2.5mA	2.5mA	5mA	2mA
Operating Temperature (°C)	-40 ~ 150	-40 ~ 85	-40 ~ 85	-40 ~ 85	-40 ~ 85	-40 ~ 85
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	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

AH180-WG-7-P (Diodes Incorporated): Active product status with ROHS3 compliance. Supply voltage range limited to 2.5V ~ 5.5V, which does not accommodate the full 3.6V ~ 24V specification of the original part. Output current specification not provided. Suitable for applications operating within the 2.5V ~ 5.5V envelope.

AH1806-W-7 (Diodes Incorporated): Active product with ROHS3 compliance and Cut Tape & Digi-Reel packaging. Supply voltage range 2.5V ~ 5.5V with maximum output current of 2.5mA. Does not support the full voltage and output current requirements of the original specification.

AH1808-W-7 (Diodes Incorporated): Active product with ROHS3 compliance and Tape & Reel packaging. Supply voltage range 2.5V ~ 5.5V with maximum output current of 2.5mA. Operating temperature range -40°C ~ 85°C. Does not accommodate the extended temperature range or full voltage specification of the original part.

SL353HT (Honeywell Sensing and Productivity Solutions): Active product with RoHS compliance and highest inventory availability (32,200 pcs). Output type is Push-Pull rather than Open Drain, requiring circuit design consideration. Supply voltage range 2.2V ~ 5.5V with maximum output current of 5mA. Operating temperature range -40°C ~ 85°C. Does not support the full voltage and output current requirements.

TLE4913HTSA1 (Infineon Technologies): Active product with ROHS3 compliance, automotive grade qualification (AEC-Q100), and temperature compensation feature. Supply voltage range 2.4V ~ 5.5V with maximum output current of 2mA. Operating temperature range -40°C ~ 85°C. Does not accommodate the extended temperature range or full voltage specification of the original part.

All substitute parts operate within reduced supply voltage ranges compared to the original A3245LLHLT-T specification (3.6V ~ 24V) and reduced maximum operating temperatures (-40°C ~ 85°C versus -40°C ~ 150°C). Selection should be based on actual application voltage and temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can any of these substitutes directly replace the A3245LLHLT-T in all applications?

A: No. The substitute parts have reduced supply voltage ranges (maximum 5.5V versus 24V for the original) and lower maximum operating temperatures (-40°C ~ 85°C versus -40°C ~ 150°C). Direct substitution is only possible in applications that operate within these reduced specifications.

Q: What is the primary difference between the SL353HT and the other substitutes?

A: The SL353HT uses Push-Pull output configuration, whereas the A3245LLHLT-T and most other substitutes use Open Drain output. Push-Pull output actively drives both high and low states, while Open Drain only pulls low. Circuit design modifications may be required when switching between these output types.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes are either ROHS3 Compliant or RoHS Compliant, meeting environmental regulatory requirements equivalent to or exceeding the original part.

Q: Which substitute has the lowest supply current consumption?

A: The AH180-WG-7-P and AH1806-W-7 both specify 16µA maximum supply current, significantly lower than the original part's 4.6mA specification.

Q: What packaging options are available for the substitute parts?

A: All substitute parts use surface mount packaging in TO-236-3, SC-59, or SOT-23-3 form factors, which are mechanically compatible with standard PCB layouts designed for small-outline three-pin devices.

Q: Does the TLE4913HTSA1 offer any additional features?

A: Yes. The TLE4913HTSA1 includes temperature compensation and carries automotive grade qualification (AEC-Q100), making it suitable for automotive applications requiring enhanced reliability and temperature stability.

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