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Allegro MicroSystems A1323ELHLT-T
- Part No.:
- A1323ELHLT-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1323ELHLT-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
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Product details
Overview
A1323ELHLT-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature automotive and industrial position sensing. It delivers 2.5 mV/G sensitivity, rail-to-rail output, quiescent output voltage at 50% of VCC, and operates from –40 °C to +85 °C in a 3-pin SOT-23W (LH) package. Used in throttle position and brake pedal sensing where stable analog field response is critical.
For engineers reviewing the A1323ELHLT-T datasheet, A1323ELHLT-T pinout, A1323ELHLT-T application, or A1323ELHLT-T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The A1323ELHLT-T integrates a Hall element, temperature-compensating circuitry, high-gain amplifier, and rail-to-rail output stage on a single BiCMOS die. Its dynamic offset cancellation uses a 150 kHz internal clock to suppress thermal stress and overmolding-induced drift.
It features ratiometric behavior: both quiescent output voltage and sensitivity scale linearly with supply voltage (4.5–5.5 V). Output bandwidth is 30 kHz, and noise is specified at ≤20 mVPP with 0.1 μF bypass capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G typical - enables precise analog magnetic field measurement with ±1.5% ratiometric stability over supply voltage. |
| Quiescent Output Voltage | 2.5 V at VCC = 5 V - fixed at 50% of supply, simplifying ADC reference alignment and eliminating need for external biasing. |
| Operating Temperature | –40 °C to +85 °C - qualified for under-hood automotive environments without derating. |
| Supply Voltage Range | 4.5–5.5 V - compatible with standard 5 V regulated systems; ratiometric scaling maintains accuracy across tolerance band. |
| Output Bandwidth | 30 kHz - supports fast-response applications such as rotating shaft speed detection up to ~1.8 million RPM (at 1 pulse/rev). |
| Noise (Peak-to-Peak) | ≤20 mV - low-noise performance allows direct interface to 10-bit+ ADCs without additional filtering in cost-sensitive designs. |
| Supply Current | 5.6–8 mA - enables low-power operation in battery-backed or always-on sensing nodes. |
Pinout & Package
Package: 3-pin SOT-23W (LH), Pb-free with 100% matte tin leadframe. Dimensions per Allegro drawing 802840: 2.98 × 1.49 × 1.00 mm (L × W × H), active area depth 0.28 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Accepts 4.5–5.5 V; includes internal Zener clamp (6–8.3 V) for transient protection; bypass capacitor (0.1 μF) required at pin. |
| VOUT (Pin 2) | Analog output | Rail-to-rail, low-impedance (≤3 Ω), capable of sourcing/sinking ±1 mA; directly interfaces to MCU ADC or comparator inputs. |
| GND (Pin 3) | Ground reference | Common return for supply and output; must be low-impedance path to minimize noise coupling into sensitive analog output. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 150 kHz clock-driven technique eliminates residual offset from mechanical stress and thermal cycling - ensures <±10 G equivalent drift over temperature. |
| Ratiometric rail-to-rail output | Output scales with VCC; quiescent point remains at exactly 50% of supply - removes dependency on precision voltage references in host system. |
| Temperature-stable sensitivity | ±1.5% ratiometric drift over VCC and ±2% long-term drift after cycling - enables reliable calibration retention in automotive life cycles. |
| High EMC immunity | Robust layout and on-chip filtering meet automotive-level EMI requirements without external ferrites or shielding in most implementations. |
| Lead-free SOT-23W package | Surface-mount footprint with 0.95 mm pin pitch - compatible with standard reflow profiles and automated assembly; no lead contamination risk. |
Applications
| Throttle Position Sensing | Brake Pedal Position Sensing |
|---|---|
|
Use Scenario: Continuous angular measurement of accelerator pedal rotation in gasoline and hybrid powertrains. IC Role / Device Role / Timing Role: Linear Hall-effect transducer converting magnetic flux from rotating magnet into proportional analog voltage signal. Use Value: 2.5 mV/G sensitivity and ±1.5% linearity enable sub-degree angular resolution without interpolation; ratiometric output rejects supply ripple common in engine bay 5 V rails. |
Use Scenario: Redundant pedal travel monitoring in electronic braking systems (EBS) and brake-by-wire architectures. IC Role / Device Role / Timing Role: Primary analog position sensor feeding safety-critical controller with real-time pedal displacement feedback. Use Value: Stable quiescent output (2.5 V ±75 mV) and immunity to mechanical stress ensure consistent zero-point calibration across vehicle lifetime and thermal cycles. |
| Seat Belt Tension Monitoring | Steering Angle Feedback (Non-Safety) |
|
Use Scenario: Detecting belt retraction force via magnetic field change induced by tensioned webbing in pretensioner systems. IC Role / Device Role / Timing Role: Analog field strength detector translating mechanical load into voltage for microcontroller interpretation. Use Value: Low 20 mVPP noise floor allows detection of <0.5 G field shifts corresponding to <5 N tension changes - sufficient for occupant classification logic. |
Use Scenario: Supporting driver assistance features (e.g., lane-keeping) with non-safety-critical steering wheel angle estimation. IC Role / Device Role / Timing Role: Secondary position sensor providing coarse angular data alongside resolver or AS5047P for redundancy and cost optimization. Use Value: 30 kHz bandwidth supports real-time tracking of rapid steering inputs up to 15 Hz hand-wheel motion without phase lag. |
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 |
|---|---|---|---|
| A1326LUA-T | Same sensitivity (2.5 mV/G), but in 3-pin SIP (UA) package; wider operating range (–40 °C to +85 °C); higher thermal resistance (165 °C/W). | Through-hole mounting only; better suited for prototyping or legacy board designs with SIP footprints. | Select when SIP compatibility or manual assembly is required; not drop-in for SOT-23W layouts. |
| A1326LLHLX-T | Enhanced high-temp variant: –40 °C to +150 °C; same LH package; identical pinout and sensitivity; improved ΔSens(TAmax) stability (–5 to +5%). | Qualified for under-hood engine control modules and transmission sensors requiring extended temperature capability. | Preferred for new designs targeting >85 °C ambient; requires updated procurement due to different suffix and lifecycle status. |
Compared with A1323ELHLT-T, A1326LUA-T offers identical electrical performance but requires PCB footprint change and has lower thermal efficiency, while A1326LLHLX-T extends temperature range and improves high-temp stability without layout impact - making it the recommended upgrade path for new designs.
Availability
A1323ELHLT-T is available at Aetrix Electronics and suitable for throttle position sensing, brake pedal monitoring, and seat belt tension detection requiring stable component supply in automotive Tier 1 production programs.
Supply support for A1323ELHLT-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 designer of high-performance magnetic sensing and power ICs, founded in 1989 and headquartered in Worcester, Massachusetts.
The A132X family was developed specifically for robust linear and rotary position sensing in harsh automotive and industrial environments, emphasizing temperature stability, mechanical stress immunity, and ratiometric accuracy.
FAQ
What is the operating temperature range of the A1323ELHLT-T?
The A1323ELHLT-T is rated for operation from –40 °C to +85 °C ambient temperature. This range is validated per Allegro's characterization data and supports use in passenger compartment and moderate under-hood locations. Junction temperature must remain below 165 °C, requiring appropriate PCB thermal design when operating near maximum ambient.
Is the A1323ELHLT-T pin-compatible with other A132X variants in the LH package?
Yes, all A132X devices in the SOT-23W (LH) package - including A1321ELHLT-T, A1322ELHLT-T, and A1323ELHLT-T - share identical pinout (VCC, VOUT, GND), footprint, and package dimensions. However, sensitivity differs (5.0, 3.125, and 2.5 mV/G respectively), so electrical substitution requires system-level recalibration.
Does the A1323ELHLT-T require an external bypass capacitor?
Yes, the A1323ELHLT-T requires a 0.1 μF ceramic capacitor placed as close as possible between VCC and GND pins. This is mandatory per Allegro's design guidelines to suppress high-frequency noise from the 150 kHz internal clock and ensure stable output with ≤20 mVPP noise performance.
What does "ratiometric" mean for the A1323ELHLT-T output?
"Ratiometric" means both the quiescent output voltage (2.5 V at 5 V supply) and sensitivity (2.5 mV/G) scale linearly with VCC. If supply drops to 4.5 V, quiescent output becomes 2.25 V and sensitivity reduces to 2.25 mV/G - preserving measurement ratio integrity and eliminating need for separate voltage references in the host system.
Is the A1323ELHLT-T still in production and available for new designs?
No - the A1323ELHLT-T is classified as "NOT FOR NEW DESIGN" per Allegro's January 31, 2011 status update. While limited inventory may be available through Aetrix Electronics for existing production, Allegro recommends migrating to A1326LLHLX-T for new applications requiring extended temperature range or long-term supply assurance.
A1323ELHLT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- SOT-23W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 8mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 30kHz
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1323ELHLT-T FAQ
1.How can I place an order for A1323ELHLT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1323ELHLT-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 A1323ELHLT-T reliable?
The price and inventory of A1323ELHLT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1323ELHLT-T is usually 5 days.
3.What payment methods are accepted for A1323ELHLT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1323ELHLT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1323ELHLT-T?
A1323ELHLT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1323ELHLT-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 A1323ELHLT-T?
For technical support, including A1323ELHLT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1323ELHLT-T requirements.
6.How does Aetrix verify that A1323ELHLT-T is sourced from the original manufacturer or authorized distributors?
All A1323ELHLT-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 A1323ELHLT-T meets industry standards.
7.What is the process for return or replacement of A1323ELHLT-T?
All A1323ELHLT-T units undergo pre-shipment inspection (PSI). If there is an issue with A1323ELHLT-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 A1323ELHLT-T part is unused and in its original packaging.
Return procedure for A1323ELHLT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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