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TLI4946KHTSA1 Equivalent & Substitute Parts
Part Overview
The TLI4946KHTSA1 is a unipolar Hall Effect magnetic switch manufactured by Infineon Technologies in the SC-59 (SOT-23-3) package. This digital switch operates with open drain output and is designed for automotive-grade applications with AEC-Q100 qualification. The part is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component sourcing.
Substiute Parts
Key Parameters
| Parameter | TLI4946KHTSA1 |
|---|---|
| Manufacturer | Infineon Technologies |
| Function | Unipolar Switch |
| Technology | Hall Effect |
| Polarization | South Pole |
| Sensing Range | 4.6mT Trip, -4.6mT Release |
| Voltage Supply | 2.7V – 18V |
| Current Supply (Max) | 6mA |
| Current Output (Max) | 20mA |
| Output Type | Open Drain |
| Operating Temperature | -40°C to 125°C |
| Package | TO-236-3, SC-59, SOT-23-3 |
| Product Status | Obsolete |
| Grade | Automotive |
| Qualification | AEC-Q100 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the TLI4946KHTSA1 is determined by the following critical parameters:
Functional Compatibility: All substitute parts must be Hall Effect magnetic switches with open drain output and South Pole polarization to maintain circuit-level compatibility.
Electrical Parameters: Supply voltage range, maximum supply current, and maximum output current must meet or exceed the original specifications. The sensing range (trip and release thresholds) determines application suitability and must be evaluated against circuit requirements.
Package Compatibility: The original part uses SOT-23-3 package. Substitute parts in SOT-23W package maintain pinout compatibility and are mechanically interchangeable.
Temperature Range: Operating temperature must cover the application's thermal requirements. The original part operates -40°C to 125°C; substitutes with extended ranges (-40°C to 150°C) provide additional margin.
Automotive Qualification: For automotive applications, AEC-Q100 qualification is required. Substitute parts must maintain this certification level.
Product Status: Active product status ensures ongoing availability and manufacturing support, eliminating obsolescence risk.
Parameter Comparison
| Part Number | Manufacturer | Function | Sensing Range (Trip/Release) | Voltage Supply | Current Supply (Max) | Current Output (Max) | Operating Temperature | Package | Product Status | AEC-Q100 |
|---|---|---|---|---|---|---|---|---|---|---|
| TLI4946KHTSA1 | Infineon | Unipolar Switch | 4.6mT / -4.6mT | 2.7V – 18V | 6mA | 20mA | -40°C to 125°C | SOT-23-3 | Obsolete | Yes |
| A1220ELHLT-T | Allegro MicroSystems | Latch | 4mT / -4mT | 3V – 24V | 4mA | 25mA | -40°C to 85°C | SOT-23W | Active | Yes |
| A1220ELHLX-T | Allegro MicroSystems | Latch | 4mT / -4mT | 3V – 24V | 4mA | 25mA | -40°C to 85°C | SOT-23W | Active | Yes |
| A1220LLHLT-T | Allegro MicroSystems | Latch | 4mT / -4mT | 3V – 24V | 4mA | 25mA | -40°C to 150°C | SOT-23W | Active | Yes |
| A1221ELHLT-T | Allegro MicroSystems | Latch | 9mT / -9mT | 3V – 24V | 4mA | 25mA | -40°C to 85°C | SOT-23W | Active | Yes |
| A1221ELHLX-T | Allegro MicroSystems | Latch | 9mT / -9mT | 3V – 24V | 4mA | 25mA | -40°C to 85°C | SOT-23W | Active | Yes |
| A1221LLHLT-T | Allegro MicroSystems | Latch | 9mT / -9mT | 3V – 24V | 4mA | 25mA | -40°C to 150°C | SOT-23W | Active | Yes |
| A1221LLHLX-T | Allegro MicroSystems | Latch | 9mT / -9mT | 3V – 24V | 4mA | 25mA | -40°C to 150°C | SOT-23W | Active | Yes |
| A1210ELHLT-T | Allegro MicroSystems | Latch | 15mT / -15mT | 3.8V – 24V | 7.5mA | 25mA | -40°C to 85°C | SOT-23W | Active | No |
| A1210LLHLT-T | Allegro MicroSystems | Latch | 15mT / -15mT | 3.8V – 24V | 7.5mA | 25mA | -40°C to 150°C | SOT-23W | Active | No |
| A1212LLHLT-T | Allegro MicroSystems | Latch | 17mT / -17mT | 3.8V – 24V | 7.5mA | 25mA | -40°C to 150°C | SOT-23W | Active | No |
Engineering Selection Recommendations
Primary Substitutes (Automotive-Qualified):
The A1220 and A1221 series from Allegro MicroSystems are the recommended substitutes for the TLI4946KHTSA1. These parts maintain AEC-Q100 automotive qualification and active product status. The A1220 series offers a 4mT sensing range closest to the original 4.6mT specification, while the A1221 series provides 9mT sensing range for applications requiring higher magnetic field thresholds.
For applications requiring extended temperature operation beyond 125°C, select A1220LLHLT-T or A1221LLHLT-T variants, which support -40°C to 150°C operating range.
Secondary Substitutes (Non-Automotive):
The A1210 and A1212 series are available as alternatives but lack AEC-Q100 qualification. These parts are suitable only for non-automotive applications. The A1210 series provides 15mT sensing range, and the A1212 series provides 17mT sensing range, both significantly higher than the original part.
Package Consideration:
All Allegro substitute parts use SOT-23W package, which is mechanically compatible with the original SOT-23-3 package. Verify PCB layout compatibility before implementation.
Frequently Asked Questions (FAQ)
Q: Can A1220 and A1221 series parts directly replace the TLI4946KHTSA1 in automotive applications?
A: Yes, the A1220 and A1221 series maintain AEC-Q100 qualification and are suitable for automotive applications. The primary difference is the function type (latch vs. unipolar switch) and sensing range. Verify that the latch function and adjusted sensing thresholds are compatible with your circuit design.
Q: What is the difference between latch and unipolar switch functions?
A: The original TLI4946KHTSA1 is a unipolar switch that responds to a single magnetic pole. The A1220 and A1221 substitutes are latch switches, which require separate trip and release magnetic field conditions. This functional difference must be evaluated against application requirements.
Q: Why do substitute parts have different sensing ranges?
A: Sensing range is determined by the Hall Effect sensor design and magnetic field detection threshold. The A1220 series (4mT) is closest to the original 4.6mT specification. The A1221 series (9mT) is suitable for applications requiring higher magnetic field thresholds. Select based on your magnetic field environment and application requirements.
Q: Are the A1210 and A1212 series suitable replacements?
A: The A1210 and A1212 series lack AEC-Q100 qualification and are not recommended for automotive applications. These parts are suitable only for industrial or consumer applications where automotive qualification is not required.
Q: What is the difference between temperature-rated variants (ELHLT vs. LLHLT)?
A: ELHLT variants operate -40°C to 85°C. LLHLT variants operate -40°C to 150°C. Select based on your application's thermal requirements. Extended temperature variants provide additional operating margin for high-temperature environments.
Q: Are packaging differences between SOT-23-3 and SOT-23W significant?
A: Both packages are three-pin surface mount devices with compatible pinouts. SOT-23W is a wider variant of SOT-23-3. Verify PCB footprint compatibility before implementation. Most modern designs accommodate both package variants.
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