A1250LLHLX-T

Part: A1250LLHLX-T — Allegro MicroSystems

Type: Hall-Effect Bipolar Switch (open-drain output)

Description: Chopper-stabilized, high-sensitivity Hall-effect bipolar switch with 3.0–24 V supply, ±-polarity switching (BOP typ 5 G, BRP typ −5 G), a short-circuit-protected open-drain output, and AEC-Q100 qualification for ring-magnet sensing.

Operating Conditions:

• Supply voltage: 3.0–24 V (operating TJ < 165 °C)
• Operating ambient temperature: -40 to 150 °C
• Output off voltage: up to 28 V (abs max)

Absolute Maximum Ratings:

• Max forward supply voltage (VCC): 28 V
• Reverse supply voltage (VRCC): -18 V
• Output off voltage (VOUT): 28 V
• Reverse output current: -10 mA
• Max junction temperature: 165 °C
• Storage temperature: -65 to 170 °C

Key Specs:

• Supply current (ICCON/ICCOFF): 4 mA max
• Output on voltage VOUT(SAT): 500 mV max at IOUT = 20 mA, B > BOP
• Output leakage current: 10 μA max at VOUT = 24 V, B < BRP
• Output current limit: 30–60 mA
• Operate point BOP: -10 / 5 / 25 G (min/typ/max)
• Release point BRP: -25 / -5 / 10 G (min/typ/max)
• Hysteresis BHYS: 5 / 10 / 25 G
• Power-on time: 25 μs max; chopping frequency 160 kHz typ
• Output rise/fall time: 2 μs max each (RLOAD = 820 Ω, CS = 20 pF)
• Thermal resistance RθJA (LH package): 228 °C/W (1-layer), 110 °C/W (2-layer)

Features:

• AEC-Q100 automotive qualified
• Quality managed (QM), ISO 26262:2011 compliant (SEooC)
• High-speed 4-phase chopper stabilization
• Low operating voltage down to 3 V
• High sensitivity with stable switch points
• Robust EMC
• Reverse battery protection (IRCC max -2 mA at -18 V)

Applications:

• Ring-magnet sensing
• Automotive sensing

Package:

• LH: 3-pin SOT23W (surface mount); this part is supplied on a 13-in. reel, 10,000 pieces/reel
• UA: 3-pin SIP (through hole), available as the A1250LUA-T variant

Package LH

Package UA

ISO 26262:2011, as a Quality Managed (QM) product. The device is classified as a SEooC (Safety Element out of Context) and can be easily integrated into safety-critical systems requiring higher ASIL ratings that incorporate external diagnostics or use measures such as redundancy. Safety documentation will be provided to support and guide the integration process. For further information, contact your local Allegro field applications engineer or sales representative.