Product Overview
The A1233 is a dual-channel Hall-effect sensor IC designed for speed and direction sensing applications using encoder ring-magnet targets. It provides output signals indicating target rotation speed and direction. The sensor features photolithographically aligned Hall elements with precise displacement, ensuring accurate detection in fine-pitch applications. Its high sensitivity and temperature stability make it suitable for demanding automotive and industrial environments. The device operates from a wide voltage range (3.5 to 24 V) due to an on-chip regulator and utilizes Allegro's high-frequency chopper stabilization to cancel offsets and ensure stable operation.
Product Attributes
- Brand: Allegro
- Certifications: AEC-Q100 automotive qualified, Quality Managed (QM), ISO 26262 compliant
- Package Options: 4-pin SIP (suffix K), 8-pin SOIC (suffix L)
- Lead Finish: 100% matte-tin leadframe plating
- RoHS Compliant: Yes
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Electrical Characteristics | ||||||
| Supply Voltage (Operating) | VCC | TA 150C | 3.5 | 24 | V | |
| Output Leakage Current | IOUTPUT(OFF) | All outputs, VOUT VCC(max) | < 1 | 10 | A | |
| Supply Current | ICC(OFF), ICC(ON) | B < BRP(A) and B < BRP(B) , or B > BOP(A) and B > BOP(B) | 2.5 | 4.5 | 8.0 | mA |
| Low Output Voltage | VOUTPUT(ON) | All outputs, Output = On, IOUTPUT(SINK) = 20 mA | 160 | 500 | mV | |
| Output Current Limit | IOUTLIM | All outputs | 30 | 70 | mA | |
| Chopping Frequency | fC | 520 | kHz | |||
| Output Rise Time | tr | CLOAD = 20 pF, RLOAD = 820 | 0.3 | s | ||
| Output Fall Time | tf | CLOAD = 20 pF, RLOAD = 820 | 0.2 | s | ||
| Speed Output Delay | tDIRSPD | Delay between direction output changing and speed output transition, VCC = 5 V, CLOAD = 12 pF, RLOAD = 820 , RLOAD connected to 5 V | 2 | 5 | s | |
| Power-On Time | tON | B > BOP + 10 G or B < BRP 10 G | 10 | 35 | s | |
| Power-Off Time | tOFF | B > BOP + 10 G or B < BRP 10 G | 10 | 36 | s | |
| Transient Protection Characteristics | ||||||
| Supply Zener Voltage | VZ | ICC = ICC(max) + 3 mA, TA = 25C | 28 | V | ||
| Supply Zener Current | IZ | VS = 28 V | 11 | mA | ||
| Reverse-Battery Current | IRCC | VRCC = 18 V, TJ < TJ(max) | 2 | 15 | mA | |
| Undervoltage Lockout | VUVLO | 3.4 | V | |||
| Magnetic Characteristics | ||||||
| Operate Point (Channel A and Channel B) | BOP | B(A) > BOP(A), B(B) > BOP(B) | 35 | 15 | 55 | G |
| Release Point (Channel A and Channel B) | BRP | B(A) < BOP(A), B(B) < BOP(B) | 55 | 15 | 35 | G |
| Hysteresis (Channel A and Channel B) | Bhys | BOP BRP | 10 | 30 | 60 | G |
| Operate Symmetry | SYMOP(AB) | BOP(A) BOP(B) | 50 | 50 | G | |
| Release Symmetry | SYMRP(AB) | BRP(A) BRP(B) | 50 | 50 | G | |
| Thermal Characteristics | ||||||
| Package K Thermal Resistance | RJA | Single-sided PCB with copper limited to solder pads | 177 | C/W | ||
| Package L Thermal Resistance | RJA | Single-sided PCB with copper limited to solder pads | 140 | C/W | ||
| Package L Thermal Resistance | RJA | 4-layer PCB based on JEDEC standard | 80 | C/W | ||
1811061514_ALLEGRO-A1233LK-T_C150816.pdf
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