A3280LLTTR-T Equivalent & Substitute Parts

Part Overview

The A3280LLTTR-T is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-89-3 surface mount packaging. This component functions as an open collector output magnetic switch with latch functionality, designed for applications requiring magnetic field detection and switching control. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	A3280LLTTR-T
Manufacturer	Allegro MicroSystems
Category	Magnetic Sensors
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	4mT Trip, -4mT Release
Voltage - Supply	4.2V ~ 24V
Current - Supply (Max)	8mA
Current - Output (Max)	25mA
Output Type	Open Collector
Operating Temperature	-40°C ~ 150°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-243AA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the A3280LLTTR-T are qualified based on the following core electrical and mechanical parameters:

Function: Latch operation with Hall Effect technology
Polarization: South Pole detection
Output Type: Open Collector configuration
Mounting Type: Surface Mount
Package / Case: TO-243AA or compatible variant
Operating Temperature Range: -40°C ~ 150°C
Supply Voltage Compatibility: Overlap with 4.2V ~ 24V range
Output Current Capability: Minimum 25mA

The substitute parts SS561AT and SS566AT meet these criteria. Both are active Honeywell Sensing and Productivity Solutions products with Hall Effect latch functionality, open collector output, surface mount configuration, and compatible temperature ratings. Differences in sensing range (trip/release thresholds) and supply current specifications are documented in the parameter comparison table below.

Parameter Comparison

Parameter	A3280LLTTR-T	SS561AT	SS566AT
Manufacturer	Allegro MicroSystems	Honeywell Sensing and Productivity Solutions	Honeywell Sensing and Productivity Solutions
Product Status	Obsolete	Active	Active
Function	Latch	Latch	Latch
Technology	Hall Effect	Hall Effect	Hall Effect
Polarization	South Pole	South Pole	South Pole
Sensing Range (Trip)	4mT	8.5mT	18mT
Sensing Range (Release)	-4mT	-8.5mT	-18mT
Voltage - Supply	4.2V ~ 24V	3.8V ~ 30V	3.8V ~ 30V
Current - Supply (Max)	8mA	10mA	10mA
Current - Output (Max)	25mA	50mA	50mA
Output Type	Open Collector	Open Collector	Open Collector
Operating Temperature	-40°C ~ 150°C (TA)	-40°C ~ 150°C (TA)	-40°C ~ 150°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA, Variant	TO-243AA, Variant
RoHS Status	ROHS3 Compliant	RoHS Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Features	—	Temperature Compensated	Temperature Compensated

Engineering Selection Recommendations

Both SS561AT and SS566AT are active products from Honeywell Sensing and Productivity Solutions and represent viable substitutes for the obsolete A3280LLTTR-T. Selection between these alternatives depends on application-specific magnetic field sensitivity requirements:

SS561AT is suitable for applications requiring magnetic field detection at 8.5mT trip threshold. This part provides moderate sensitivity with temperature compensation and is available in Tape & Reel packaging.

SS566AT is suitable for applications requiring magnetic field detection at 18mT trip threshold. This part provides lower sensitivity with temperature compensation and is available in Cut Tape packaging.

Both substitute parts exceed the original component's output current capability (50mA versus 25mA) and supply voltage range (3.8V ~ 30V versus 4.2V ~ 24V), providing enhanced performance margins. Both maintain compliance with RoHS and REACH regulations and support the full operating temperature range of -40°C ~ 150°C.

Frequently Asked Questions (FAQ)

Q: Can SS561AT or SS566AT be used as direct replacements for A3280LLTTR-T?

A: Both SS561AT and SS566AT are functionally compatible substitutes. They share identical latch function, Hall Effect technology, South Pole polarization, open collector output type, surface mount configuration, and TO-243AA package compatibility. The primary difference is magnetic field sensitivity threshold. Application requirements determine which substitute is appropriate.

Q: What is the difference between SS561AT and SS566AT?

A: The primary difference is sensing range. SS561AT operates at 8.5mT trip and -8.5mT release thresholds, while SS566AT operates at 18mT trip and -18mT release thresholds. Both are temperature compensated and support identical supply voltage and output current specifications. Selection depends on the magnetic field strength present in the target application.

Q: Are there packaging differences between the substitute parts?

A: SS561AT is supplied in Tape & Reel (TR) packaging, while SS566AT is supplied in Cut Tape (CT) packaging. Both use TO-243AA case variants compatible with the original A3280LLTTR-T footprint.

Q: Do the substitute parts maintain the same operating temperature range?

A: Yes. Both SS561AT and SS566AT support -40°C ~ 150°C operating temperature range, identical to the original A3280LLTTR-T.

Q: What are the compliance and regulatory differences?

A: The original A3280LLTTR-T is ROHS3 Compliant. Both substitute parts are RoHS Compliant. All three parts are REACH Unaffected and classified as EAR99 for export control purposes. Moisture Sensitivity Level is 1 (Unlimited) for all three parts.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message