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Allegro MicroSystems A1318LUA-2-T
- Part No.:
- A1318LUA-2-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1318LUA-2-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
A1318LUA-2-T from Allegro MicroSystems is a linear Hall-effect sensor IC with analog output, designed for high-accuracy angular and displacement sensing in automotive and industrial systems. It delivers 2.5 mV/G sensitivity, ratiometric 1.65 V quiescent output at 3.3 V supply, and operates across –40°C to 150°C. Its 3-pin ultramini SIP (UA) package supports through-hole mounting in space-constrained motor position feedback and throttle control applications.
For engineers reviewing the A1318LUA-2-T datasheet, A1318LUA-2-T pinout, A1318LUA-2-T application, or A1318LUA-2-T equivalent, key selection considerations include its programmed QVO temperature coefficient (0.12%/°C typ), ±1.5% linearity error, 20 kHz bandwidth, UVLO thresholds (2.5 V/3.0 V), and output clamping for short-circuit diagnostics.
Technical Context
The A1318LUA-2-T integrates a BiCMOS monolithic circuit with a Hall element, dynamic offset cancellation, and temperature-compensated sensitivity/QVO programming. Its high-speed chopping scheme (400 kHz typ) suppresses thermal and mechanical stress-induced drift, enabling precise recoverability after temperature cycling.
It implements ratiometric operation: VOUT(Q), sensitivity, and clamp voltages scale linearly with VCC. The device features undervoltage lockout (UVLO), output voltage clamps (0.33 V / 2.97 V at 3.3 V), and a 50 µs power-on time - all validated over its full –40°C to 150°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G (typ); enables precise magnetic field resolution for sub-degree angular position sensing |
| Quiescent Output Voltage | 1.65 V (typ at 3.3 V supply); centered at 50% of VCC for maximum signal swing |
| Supply Voltage Range | 3.0–3.63 V; compatible with standard 3.3 V rail without regulation overhead |
| Operating Temperature | –40°C to 150°C; qualified for under-hood automotive and industrial motor control environments |
| Bandwidth | 20 kHz (–3 dB); supports real-time closed-loop control in fast-response actuator systems |
| QVO Temp Coefficient | 0.12%/°C (typ); factory-programmed to minimize drift across temperature extremes |
| Linearity Error | ±1.5%; ensures accurate position tracking without software linearization in most applications |
| UVLO Thresholds | 2.5 V (off), 3.0 V (on); prevents erratic output during brown-out conditions |
Pinout & Package
Package: 3-pin ultramini SIP (UA), 1.5 mm × 4 mm × 3 mm, through-hole mount, lead-free with 100% matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power input | Supplies 3.0–3.63 V; requires 0.1 µF bypass capacitor to GND for noise immunity |
| GND | Ground reference | Return path for supply and output; must be low-impedance to minimize offset error |
| VOUT | Analog output | Ratiometric voltage proportional to magnetic field; clamped at 0.33 V / 2.97 V for fault detection |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | Eliminates thermal/mechanical drift via high-frequency chopping (400 kHz), ensuring stable QVO across temperature cycles |
| Factory-programmed TC | Temperature coefficients for sensitivity and QVO are laser-trimmed at end-of-line, guaranteeing 0.12%/°C typ accuracy |
| Output voltage clamps | Provides diagnostic capability: low clamp (0.33 V) and high clamp (2.97 V) indicate short-to-ground or short-to-rail faults |
| Undervoltage lockout | Hysteresis between 2.5 V (disable) and 3.0 V (enable) prevents metastable output during power ramp-up/down |
| Ratiometric architecture | VOUT(Q), sensitivity, and clamps scale with VCC, removing dependency on supply regulation stability |
Applications
| Motor Position Feedback | Throttle Valve Sensing |
|---|---|
Use Scenario: Monitoring rotor angle in BLDC motors for commutation timing in electric power steering (EPS) systems. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnetic pole position relative to stator. Use Value: 20 kHz bandwidth and ±1.5% linearity enable accurate 120° electrical phase detection without interpolation, reducing MCU processing load. | Use Scenario: Measuring angular displacement of accelerator pedal or throttle body in ICE and hybrid powertrains. IC Role / Device Role / Timing Role: Primary position transducer converting mechanical rotation into ratiometric voltage for ECU interpretation. Use Value: Ratiometric output and 0.12%/°C QVO TC ensure consistent pedal mapping across –40°C to 150°C ambient, meeting ASIL-B functional safety requirements. |
| Brake Pedal Position | Industrial Linear Actuator |
Use Scenario: Detecting brake pedal travel in electronic braking systems where redundancy and reliability are critical. IC Role / Device Role / Timing Role: Safety-relevant analog sensor delivering fail-safe position data with output clamping for open/short diagnostics. Use Value: Output voltage clamps (0.33 V / 2.97 V) provide immediate hardware-level fault indication, supporting ISO 26262 diagnostic coverage. | Use Scenario: Closed-loop position control of hydraulic or pneumatic actuators in factory automation equipment. IC Role / Device Role / Timing Role: High-accuracy linear displacement sensor interfacing directly with analog-to-digital converter inputs. Use Value: 2.5 mV/G sensitivity and <1 Ω output impedance allow direct connection to 12-bit ADCs without signal conditioning, simplifying BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall-effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1315LUA-2-T | Same UA package, identical 2.5 mV/G sensitivity and QVO, but uses legacy trimming (no programmable TC) | Lacks factory-programmed QVO/sensitivity temperature coefficients; exhibits higher ∆VOUT(Q) drift (±20 mV vs. ±13 mV) | Select only if legacy qualification or cost sensitivity outweighs long-term thermal stability requirements |
| ACS724LLCTR-20AU-T | Current sensor (not field sensor); 20 A range, SOIC-8 package, digital output option available | Measures current flow, not magnetic field; unsuitable for position/displacement sensing without external magnet | Choose only for current monitoring applications; not a functional substitute for A1318LUA-2-T's linear field sensing role |
Compared with A1315LUA-2-T, the A1318LUA-2-T offers superior thermal stability via programmable coefficients, while ACS724LLCTR-20AU-T serves a fundamentally different measurement domain - making A1318LUA-2-T irreplaceable for direct magnetic field-based position sensing.
Availability
A1318LUA-2-T is available at Aetrix Electronics and suitable for automotive throttle control, industrial actuator feedback, and brake pedal position sensing requiring stable component supply despite its last-time-buy status.
Supply support for A1318LUA-2-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based semiconductor company specializing in magnetic sensing and power ICs for automotive and industrial markets.
The A1318 family was developed to deliver high-accuracy, temperature-stable linear Hall-effect sensing in miniature packages for next-generation motor control and position feedback systems.
FAQ
What is the operating temperature range of the A1318LUA-2-T?
The A1318LUA-2-T is rated for –40°C to 150°C ambient operation, validated across this full range for quiescent output stability, sensitivity accuracy, and UVLO functionality. Its BiCMOS process and factory-programmed temperature coefficients ensure performance consistency in under-hood automotive and industrial motor environments where thermal cycling is severe.
Does the A1318LUA-2-T require an external bypass capacitor?
Yes, the A1318LUA-2-T requires a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to the device pins. This capacitor stabilizes the internal regulator, reduces noise coupling, and ensures reliable operation of the chopping circuitry and analog output stage - omission risks increased output noise and degraded linearity.
What does "Not for New Design" mean for the A1318LUA-2-T?
"Not for New Design" indicates that Allegro has classified the A1318LUA-2-T as obsolete for future projects. It remains available for existing customer programs but is not recommended for new designs due to planned discontinuation. Aetrix Electronics supports legacy procurement with traceable lots and coordinated lifecycle planning for ongoing production needs.
How does the output clamping feature work in the A1318LUA-2-T?
The A1318LUA-2-T provides active output clamping: VOUT is limited to 0.33 V (low clamp) when shorted to VCC and 2.97 V (high clamp) when shorted to GND, both measured at 3.3 V supply. These clamps are ratiometric - scaling with VCC - and serve as hardware-level diagnostics, enabling immediate fault detection without additional circuitry in safety-critical applications.
Is the A1318LUA-2-T pin-compatible with other A1318 variants in the UA package?
Yes, all A1318 variants in the UA package - including A1318LUATN-2-T and A1318LUA-2-T - share identical 3-pin SIP pinout (VCC–GND–VOUT), mechanical footprint, and soldering profile. This allows direct substitution within the same package family, though sensitivity and temperature coefficient values differ and must be verified per application requirement.
A1318LUA-2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 3-SSIP
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 3V ~ 3.63V
- Current - Supply (Max):
- 10mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1318LUA-2-T FAQ
1.How can I place an order for A1318LUA-2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1318LUA-2-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A1318LUA-2-T reliable?
The price and inventory of A1318LUA-2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1318LUA-2-T is usually 5 days.
3.What payment methods are accepted for A1318LUA-2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1318LUA-2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1318LUA-2-T?
A1318LUA-2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1318LUA-2-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A1318LUA-2-T?
For technical support, including A1318LUA-2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1318LUA-2-T requirements.
6.How does Aetrix verify that A1318LUA-2-T is sourced from the original manufacturer or authorized distributors?
All A1318LUA-2-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A1318LUA-2-T meets industry standards.
7.What is the process for return or replacement of A1318LUA-2-T?
All A1318LUA-2-T units undergo pre-shipment inspection (PSI). If there is an issue with A1318LUA-2-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A1318LUA-2-T part is unused and in its original packaging.
Return procedure for A1318LUA-2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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