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Allegro MicroSystems A1308KUA-5-T
- Part No.:
- A1308KUA-5-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1308KUA-5-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,494
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Product details
Overview
A1308KUA-5-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-accuracy angular and displacement sensing in automotive and industrial systems. It delivers 5 mV/G sensitivity, ±1.5% linearity error, and temperature-stable quiescent output (2.5 V at 5 V supply) across –40°C to 125°C. Its 3-pin SIP through-hole package enables robust mounting in motor position feedback and throttle pedal applications.
For engineers reviewing the A1308KUA-5-T datasheet, A1308KUA-5-T pinout, A1308KUA-5-T application, or A1308KUA-5-T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The A1308KUA-5-T integrates a BiCMOS monolithic circuit featuring a Hall element, dynamic offset cancellation, temperature-compensated sensitivity and QVO programming, and a tuned low-pass filter. Its high-speed chopping scheme operates at 400 kHz to suppress thermal drift and mechanical stress-induced offset.
This device implements ratiometric operation: output voltage, sensitivity, and clamp thresholds scale linearly with supply voltage (4.5–5.5 V). Undervoltage lockout (UVLO) enforces defined power-on behavior with 2.5 V turn-off and 3 V turn-on thresholds, ensuring deterministic startup in noisy automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 4.85–5.15 mV/G - Enables precise magnetic field resolution down to ~0.2 G per LSB in 12-bit ADC systems with 5 V supply. |
| Quiescent Output Voltage | 2.488–2.512 V at 5 V supply - Centered at 50% VCC for maximum symmetric swing in analog signal chains. |
| Operating Temperature Range | –40°C to +125°C - Validated for under-hood automotive use and industrial motor control enclosures without derating. |
| Supply Voltage Range | 4.5–5.5 V - Compatible with standard 5 V LDOs; ratiometric behavior maintains accuracy across supply tolerance. |
| Internal Bandwidth | 20 kHz - Supports real-time closed-loop control of rotating machinery up to 120,000 RPM with <5 µs latency. |
| Output Noise Density | 1.5 mG/√Hz - Enables sub-degree angular resolution in precision rotary encoders with proper filtering. |
| Linearity Error | ±1.5% - Limits position measurement error to ≤0.8° over full magnetic range in angular sensing configurations. |
Pinout & Package
Package: 3-pin ultramini SIP (UA), through-hole, 1.5 mm × 4 mm × 3 mm, lead-free with 100% matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power input | Must be bypassed with ≥0.1 µF capacitor to GND; UVLO thresholds (2.5 V off / 3 V on) ensure clean startup in battery-supplied systems. |
| VOUT (Pin 3) | Analog output | Low-impedance ratiometric voltage (0.4–4.65 V clamped); drives ≥4.7 kΩ loads directly; supports short-circuit diagnostics via clamp detection. |
| GND (Pin 2) | Reference ground | Common return for supply and output; thermal resistance RθJA = 165 °C/W on 1-layer PCB - requires thermal relief for continuous 11.5 mA operation. |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line sensitivity & QVO optimization | Each A1308KUA-5-T unit is individually programmed for matched sensitivity and 2.5 V quiescent output, eliminating system-level calibration in production. |
| Programmed sensitivity temperature coefficient | 0.08–0.16 %/°C - Compensates intrinsic Hall element drift across –40°C to 125°C, reducing ∆SensTC to <±1.5% full-scale. |
| Chopping frequency at 400 kHz | Enables >99% rejection of 1/f noise and thermomechanical offset drift, achieving <±10 mV QVO drift over full temperature range. |
| Output voltage clamps | VCLPHIGH = 4.35–4.65 V and VCLPLOW = 0.40–0.70 V provide hardware-level fault detection for open-load or short-circuit conditions. |
| AEC-Q100 qualified | Validated to Grade 0 (–40°C to +150°C junction) stress testing - certified for safety-critical automotive subsystems including EPS and transmission control. |
Applications
| Throttle Pedal Position Sensing | Electric Power Steering (EPS) Motor Rotor Position |
|---|---|
Use Scenario: Non-contact measurement of accelerator pedal angle in gasoline and hybrid vehicles, requiring fail-safe redundancy and EMC resilience. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to pedal rotation, interfaced to ASIL-B microcontroller ADC inputs. Use Value: ±1.5% linearity and <±10 mV QVO drift enable <0.5° pedal angle error over lifetime, meeting ISO 26262 ASIL-B diagnostic coverage requirements. |
Use Scenario: High-bandwidth rotor position feedback for brushless DC motor commutation in 12 V EPS systems operating at ambient –40°C to 125°C. IC Role / Device Role / Timing Role: Analog position sensor feeding closed-loop current controller with 20 kHz bandwidth and <5 µs latency. Use Value: 400 kHz chopping and 20 kHz bandwidth support real-time torque ripple suppression, improving steering feel and reducing audible motor noise. |
| Industrial Servo Motor Commutation | Brake Pedal Travel Monitoring |
Use Scenario: Compact, high-reliability position feedback in IP65-rated servo drives for packaging and CNC equipment, where vibration and thermal cycling degrade potentiometers. IC Role / Device Role / Timing Role: Through-hole mounted Hall sensor delivering ratiometric output to FPGA-based motion controller ADCs. Use Value: Immunity to mechanical stress and ±2% sensitivity hysteresis after thermal cycling ensure <0.1% position repeatability over 10,000 cycles without recalibration. |
Use Scenario: Redundant brake travel monitoring in commercial vehicle ABS systems, requiring dual independent analog channels with fault detection. IC Role / Device Role / Timing Role: Primary analog sensor with built-in short-circuit diagnostics via output clamps, paired with second A1308KUA-5-T for cross-checking. Use Value: VCLPHIGH/VCLPLOW clamps enable real-time wire-break and short-to-battery detection, satisfying FMVSS 135 brake system functional safety requirements. |
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 |
|---|---|---|---|
| A1308LLHLX-5-T | Same sensitivity (4.85–5.15 mV/G) and electrical specs, but in SOT-23W surface-mount package with extended –40°C to 150°C rating. | Required for reflow-soldered PCBs or higher-temperature environments (e.g., engine bay proximity). | Select when board space is constrained or junction temperature exceeds 125°C; requires layout revision due to different footprint and thermal path. |
| TLV493D-A1B6 | 3-axis digital I²C output (12-bit), 2.8–3.5 V supply, ±1.5° angular accuracy, no internal UVLO or output clamps. | Used in multi-axis orientation sensing (e.g., robotic joint angle) where digital interface and low power (<100 µA sleep) are prioritized over analog simplicity. | Choose for systems needing multi-axis data or ultra-low power; not drop-in - requires firmware changes, level-shifting, and external fault monitoring. |
Compared with A1308LLHLX-5-T, the A1308KUA-5-T offers identical core sensing performance but trades surface-mount miniaturization for through-hole mechanical robustness and lower thermal resistance in high-vibration mounts; versus TLV493D-A1B6, it provides analog immediacy and integrated diagnostics at the cost of digital flexibility and multi-axis capability.
Availability
A1308KUA-5-T is available at Aetrix Electronics and suitable for automotive throttle control, electric power steering systems, industrial servo feedback, and brake pedal monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A1308KUA-5-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 Manchester, NH. It specializes in Hall-effect, current-sensing, and motor driver solutions for demanding automotive and industrial markets.
The A1308 family was developed specifically for high-accuracy, temperature-stable linear position sensing in safety-critical automotive subsystems and rugged industrial motion control, emphasizing end-of-line programmability, mechanical stress immunity, and AEC-Q100 compliance.
FAQ
What is the operating temperature range for the A1308KUA-5-T?
The A1308KUA-5-T is rated for an operating ambient temperature range of –40°C to +125°C, validated per its K-temperature option designation. This range covers under-hood automotive locations and industrial motor control enclosures without requiring derating. The device maintains specified sensitivity, QVO, and linearity across this full span due to factory-programmed temperature coefficients.
Does the A1308KUA-5-T require an external bypass capacitor?
Yes, the A1308KUA-5-T requires a minimum 0.1 µF ceramic bypass capacitor between VCC (Pin 1) and GND (Pin 2). This capacitor stabilizes the internal regulator, suppresses supply noise, and ensures proper operation of the chopping circuitry and UVLO function. Placement within 2 mm of the pins is recommended to maintain EMC performance and prevent oscillation.
How does the A1308KUA-5-T achieve temperature stability of its quiescent output voltage?
The A1308KUA-5-T achieves QVO stability through end-of-line programming of both the quiescent voltage output and its temperature coefficient at Allegro's test facility. Each unit is calibrated at 125°C to minimize drift across –40°C to 125°C, resulting in a typical ∆VOUT(Q) of –20 to +10 mV over temperature - significantly tighter than unprogrammed Hall sensors.
Can the A1308KUA-5-T be used in safety-critical automotive applications?
Yes, the A1308KUA-5-T is AEC-Q100 qualified (Grade 0), making it suitable for ASIL-B automotive applications such as throttle position sensing and EPS rotor feedback. Its integrated diagnostics - including output voltage clamps for short-circuit detection and undervoltage lockout - support functional safety requirements without external components.
What is the purpose of the output voltage clamps in the A1308KUA-5-T?
The A1308KUA-5-T features internal output clamps (VCLPHIGH ≈ 4.5 V and VCLPLOW ≈ 0.55 V at 5 V supply) that limit VOUT excursion beyond its linear range. These clamps serve dual purposes: they protect downstream circuitry from overvoltage, and they enable simple hardware-level fault detection - e.g., a sustained VOUT near 0.55 V indicates a short-to-VCC condition.
A1308KUA-5-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 3-SSIP
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 11.5mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1308KUA-5-T FAQ
1.How can I place an order for A1308KUA-5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1308KUA-5-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 A1308KUA-5-T reliable?
The price and inventory of A1308KUA-5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1308KUA-5-T is usually 5 days.
3.What payment methods are accepted for A1308KUA-5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1308KUA-5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1308KUA-5-T?
A1308KUA-5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1308KUA-5-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 A1308KUA-5-T?
For technical support, including A1308KUA-5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1308KUA-5-T requirements.
6.How does Aetrix verify that A1308KUA-5-T is sourced from the original manufacturer or authorized distributors?
All A1308KUA-5-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 A1308KUA-5-T meets industry standards.
7.What is the process for return or replacement of A1308KUA-5-T?
All A1308KUA-5-T units undergo pre-shipment inspection (PSI). If there is an issue with A1308KUA-5-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 A1308KUA-5-T part is unused and in its original packaging.
Return procedure for A1308KUA-5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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