A3280LLHLT Equivalent & Substitute Parts

Part Overview

The A3280LLHLT is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This component operates as an open collector output device with a sensing range of 4mT trip and -4mT release, designed for applications requiring magnetic field detection with latch functionality. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and new production requirements.

Substiute Parts

A3280LLHLT

Allegro MicroSystemsIn Stock: 1144A3280LLHLT Datasheet

Current PartRFQ

TLE49161KHTSA1

Infineon TechnologiesIn Stock: 819TLE49161KHTSA1 Datasheet

MFR RecommendedRFQ

TLE49462KHTSA1

Infineon TechnologiesIn Stock: 25449TLE49462KHTSA1 Datasheet

MFR RecommendedRFQ

TLI49462KHTSA1

Infineon TechnologiesIn Stock: 828TLI49462KHTSA1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3280LLHLT is determined by the following critical parameters:

Function Type: The main part operates as a latch function Hall Effect sensor. Substitute parts must maintain latch or compatible switching functionality.

Output Configuration: The A3280LLHLT uses open collector output. Substitutes with open collector output provide direct functional equivalence; open drain alternatives require circuit evaluation for compatibility.

Sensing Range: The original part triggers at 4mT and releases at -4mT. Substitute parts with similar or tighter sensing ranges (4.6mT to 5mT) maintain functional compatibility within typical application tolerances.

Supply Voltage: The A3280LLHLT operates from 4.2V to 24V. Substitutes must support overlapping voltage ranges to ensure proper operation in existing circuits.

Output Current: Maximum output current of 25mA defines load-driving capability. Substitutes must meet or exceed this specification.

Operating Temperature: The -40°C to 150°C range is critical for industrial and automotive applications. Substitutes maintaining this range ensure thermal compatibility.

Packaging & Mounting: Surface mount SOT-23W packaging is the baseline. Pin-compatible alternatives in SC-59 or TO-236-3 packages are mechanically substitutable with PCB layout verification.

Compliance Status: RoHS and REACH compliance status affects regulatory acceptability in new designs and production environments.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TLE49462KHTSA1

The TLE49462KHTSA1 is the most direct functional equivalent. It maintains latch function, open collector output, and South Pole polarization. The sensing range of 4.6mT trip and -4.6mT release is tighter than the original 4mT specification, providing enhanced sensitivity. Supply voltage range of 2.7V to 18V overlaps the original 4.2V to 24V window. Output current of 20mA approaches the original 25mA specification. Operating temperature extends to 150°C, matching the original range. The part is currently active with high inventory availability (25,400 pcs). ROHS3 compliance and AEC-Q100 automotive qualification make this suitable for regulated production environments. Surface mount SC-59 packaging is pin-compatible with SOT-23W with standard PCB layout considerations.

Secondary Substitute: TLE49161KHTSA1

The TLE49161KHTSA1 maintains latch function and South Pole polarization with open drain output. However, the supply voltage range of 2.4V to 5V is significantly narrower than the original 4.2V to 24V specification, limiting applicability to lower-voltage systems. Maximum output current of 2mA is substantially below the original 25mA, restricting load-driving capability. Operating temperature maximum of 125°C is 25°C below the original specification. This part is discontinued at DiGi Electronics, reducing long-term availability. Use only when voltage and current constraints align with application requirements.

Tertiary Substitute: TLI49462KHTSA1

The TLI49462KHTSA1 differs functionally as a unipolar switch rather than a latch. The sensing range of 19.2mT trip and -19.2mT release is significantly wider than the original 4mT specification, making it unsuitable for applications requiring precise magnetic field detection at lower thresholds. Open drain output requires circuit adaptation from the original open collector configuration. Supply voltage range of 2.7V to 18V and output current of 20mA are acceptable. Operating temperature maximum of 125°C is below the original specification. This part is suitable only for applications where unipolar switching function and wider sensing range are acceptable trade-offs.

Compliance Considerations

All Infineon substitutes are ROHS3 compliant, addressing regulatory requirements absent in the original RoHS non-compliant A3280LLHLT. TLE49462KHTSA1 and TLI49462KHTSA1 carry AEC-Q100 automotive qualification, enabling use in automotive and high-reliability applications. Selection should align with production compliance mandates and end-application requirements.

Frequently Asked Questions (FAQ)

Q: Can TLE49462KHTSA1 directly replace A3280LLHLT without circuit modification?

A: TLE49462KHTSA1 is functionally compatible as a latch Hall Effect sensor with open collector output. Pin compatibility between SOT-23W and SC-59 packages requires PCB layout verification. The tighter sensing range (4.6mT vs. 4mT) may affect trigger thresholds in sensitive applications; circuit testing is necessary to confirm performance equivalence.

Q: What is the key difference between TLE49462KHTSA1 and TLI49462KHTSA1?

A: TLE49462KHTSA1 is a latch function sensor with open collector output and 4.6mT sensing range. TLI49462KHTSA1 is a unipolar switch with open drain output and 19.2mT sensing range. The latch function maintains state until the opposite magnetic field threshold is reached, while unipolar switching responds to a single threshold. Choose based on application switching requirements.

Q: Why is TLE49161KHTSA1 not recommended as a primary substitute?

A: TLE49161KHTSA1 has a restricted supply voltage range (2.4V to 5V) compared to the original 4.2V to 24V specification, limiting applicability to lower-voltage systems. Maximum output current of 2mA is insufficient for applications requiring the original 25mA capability. The part is also discontinued, affecting long-term availability and supply chain reliability.

Q: Are there package compatibility concerns when switching from SOT-23W to SC-59?

A: SOT-23W and SC-59 (TO-236-3) are mechanically compatible surface mount packages with identical pin counts and spacing. PCB footprint verification is required to confirm pad alignment and trace routing compatibility. Consult package datasheets for precise dimensional specifications before PCB layout finalization.

Q: How does the sensing range difference affect application performance?

A: The A3280LLHLT triggers at 4mT and releases at -4mT. TLE49462KHTSA1 triggers at 4.6mT and releases at -4.6mT, providing tighter sensitivity. TLI49462KHTSA1 triggers at 19.2mT, requiring significantly stronger magnetic fields. Application performance depends on magnet strength and positioning; magnetic field strength analysis is necessary to confirm substitute compatibility.

Q: What compliance advantages do Infineon substitutes offer?

A: All Infineon substitutes are ROHS3 compliant, meeting current environmental regulations. TLE49462KHTSA1 and TLI49462KHTSA1 carry AEC-Q100 automotive qualification, enabling use in automotive, industrial, and high-reliability applications where compliance certification is mandatory. The original A3280LLHLT is RoHS non-compliant, restricting use in regulated production environments.

Q: Can TLE49462KHTSA1 operate across the full original temperature range?

A: TLE49462KHTSA1 operates from -40°C to 150°C, matching the original A3280LLHLT specification. TLE49161KHTSA1 and TLI49462KHTSA1 are limited to -40°C to 125°C, reducing maximum operating temperature by 25°C. For applications requiring full 150°C operation, TLE49462KHTSA1 is the only suitable substitute.