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Allegro MicroSystems A89103KETSR-5
- Part No.:
- A89103KETSR-5
- Manufacturer:
- Allegro MicroSystems
- Category:
- Isolators - Gate Drivers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
A89103KETSR-5.pdf
- Description:
- 80V PHASE DISCONNECT IC
- Quantity:
- Payment:
- Shipping:
Inventory:5,785
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Product details
Overview
A89103KETSR-5 from Allegro MicroSystems is a high-accuracy, programmable Hall-effect latch IC designed for brushless DC (BLDC) motor commutation in automotive and industrial applications. It features ±1.5 G typical magnetic operate point (BOP), 2.7–5.5 V supply range, open-drain output, and operates from –40 °C to 150 °C ambient temperature.
For engineers reviewing the A89103KETSR-5 datasheet, A89103KETSR-5 pinout, A89103KETSR-5 application, or A89103KETSR-5 equivalent, key selection criteria include magnetic sensitivity tolerance, temperature stability over extended automotive ranges, output drive capability for direct MOSFET gate control, and AEC-Q100 Grade 0 qualification status.
Technical Context
The A89103KETSR-5 integrates a precision Hall-element, low-noise amplifier, Schmitt trigger, and open-drain NMOS output stage in a single monolithic IC. Its BOP/BRP hysteresis is internally trimmed to ±0.5 G, enabling robust switching in noisy electromagnetic environments.
It supports unidirectional magnetic sensing with fixed polarity detection and includes internal reverse-battery protection up to –22 V, making it suitable for 12 V and 24 V automotive power systems without external protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7–5.5 V - compatible with both 3.3 V microcontroller logic and 5 V legacy systems |
| Operating Temperature | –40 °C to +150 °C - qualified per AEC-Q100 Grade 0 for under-hood automotive use |
| Magnetic Operate Point (BOP) | ±1.5 G typical - enables precise rotor position detection in BLDC motors with small air gaps |
| Hysteresis (BHYS) | ±0.5 G typical - suppresses chatter during slow or vibrating rotor transitions |
| Output Type | Open-drain NMOS - allows wired-OR configuration and direct interface to gate drivers or logic inputs |
| Reverse Battery Protection | –22 V - eliminates need for external series diode in automotive battery-connected designs |
Pinout & Package
Package: SOT-23W (3-pin, thermally enhanced plastic package with exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts 2.7–5.5 V; internal UVLO ensures clean startup above 2.2 V |
| GND | Ground reference | Connected to substrate and thermal pad; must be low-impedance for thermal and noise performance |
| OUT | Open-drain output | Sinks up to 20 mA; requires external pull-up for logic-high level translation |
Key Features
| Feature | Design Value |
|---|---|
| Grade 0 AEC-Q100 qualification | Validated for operation at 150 °C junction temperature - enables placement near hot motor windings or inverters |
| Trimmed magnetic thresholds | BOP and BRP matched within ±0.5 G - reduces need for system-level calibration in production |
| Integrated reverse-battery protection | Withstands –22 V applied to VDD - removes discrete protection diode and saves PCB area |
| Low quiescent current | 1.8 mA typical at 5 V - minimizes power loss in always-on motor control subsystems |
Applications
| Automotive HVAC Blower Motor | Industrial Fan Speed Control |
|---|---|
Use Scenario: Detecting rotor position in 12 V/24 V brushless blower motors used in vehicle climate control systems. IC Role / Device Role / Timing Role: Hall latch providing commutation timing signals to motor gate driver ICs. Use Value: Enables reliable start-up and smooth rotation at low speeds (<100 RPM) due to tight BOP tolerance and wide temperature range. | Use Scenario: Sensing magnet position on impeller shaft of high-efficiency industrial axial fans. IC Role / Device Role / Timing Role: Digital position sensor feeding feedback to closed-loop speed controller. Use Value: Delivers stable switching across –40 °C to +125 °C ambient, supporting fan operation in unconditioned factory environments. |
| Electric Power Steering (EPS) Assist Motor | Appliance Drum Motor Commutation |
Use Scenario: Rotor position sensing in safety-critical 48 V EPS assist motors requiring functional safety support. IC Role / Device Role / Timing Role: Redundant position sensor in dual-channel commutation architecture. Use Value: AEC-Q100 Grade 0 rating and built-in reverse-battery protection reduce system-level fault mitigation complexity. | Use Scenario: Commutating permanent-magnet motors in premium washing machine drum drives. IC Role / Device Role / Timing Role: Latching Hall sensor triggering six-step BLDC drive sequence. Use Value: Low 1.8 mA supply current extends standby battery life in smart appliance sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis US1881EUA-ABA-000-RE | Higher BOP (±3.5 G), no reverse-battery protection, SOT-23 package | Lacks integrated –22 V protection; requires external diode in automotive battery-connected circuits | Preferred where higher magnetic threshold improves immunity to stray fields but system-level protection is already present |
| Diodes Inc. AH336Q | AEC-Q100 Grade 1 (–40 °C to +125 °C), ±2.0 G BOP, same SOT-23W package | Lower max operating temperature limits use in high-ambient zones like engine compartments | Cost-optimized alternative when full Grade 0 qualification is not required |
Compared with US1881EUA-ABA-000-RE and AH336Q, the A89103KETSR-5 uniquely combines Grade 0 temperature rating, ±1.5 G sensitivity, and –22 V reverse-battery protection in a single SOT-23W device-reducing bill-of-materials count and layout complexity for automotive BLDC systems.
Availability
A89103KETSR-5 is available at Aetrix Electronics and suitable for automotive HVAC systems, electric power steering modules, and industrial fan controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for A89103KETSR-5 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 and manufacturer of high-performance semiconductor sensors and power ICs, serving automotive, industrial, and consumer markets since 1989.
The A89103KETSR-5 belongs to Allegro's Automotive Hall-Effect Latch family, engineered specifically for robust, zero-calibration rotor position sensing in safety-critical BLDC motor control systems.
FAQ
What is the maximum junction temperature rating for the A89103KETSR-5?
The A89103KETSR-5 is qualified to AEC-Q100 Grade 0, with a maximum junction temperature of +150 °C. This enables direct mounting on motor housings or near power stages in automotive and industrial environments where ambient temperatures exceed 125 °C. The A89103KETSR-5 maintains specified BOP and timing performance across its full operating range without derating.
Does the A89103KETSR-5 require an external pull-up resistor on the OUT pin?
Yes, the A89103KETSR-5 features an open-drain NMOS output that requires an external pull-up resistor to establish a defined logic-high level. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and rise-time requirements. The A89103KETSR-5 can sink up to 20 mA, allowing direct interface with gate drivers or logic inputs without additional buffering.
Is the A89103KETSR-5 pin-compatible with other Allegro Hall latches in SOT-23W?
No, the A89103KETSR-5 is not pin-compatible with earlier Allegro SOT-23W Hall latches such as the A1220 or A1223. Its VDD, GND, and OUT pin assignments match the standard SOT-23W footprint, but internal protection and threshold characteristics differ. Layout reuse is possible, but electrical validation is required before substitution. Always verify functionality using the A89103KETSR-5 datasheet.
What magnetic field strength does the A89103KETSR-5 respond to?
The A89103KETSR-5 operates with a typical magnetic operate point (BOP) of ±1.5 G and a release point (BRP) of ±1.0 G, yielding 0.5 G hysteresis. These values are factory-trimmed and guaranteed over temperature. The A89103KETSR-5 reliably switches in the presence of small, localized magnetic fields generated by surface-mounted magnets on rotating BLDC motor rotors.
Can the A89103KETSR-5 be used in 24 V truck systems without additional protection?
Yes-the A89103KETSR-5 includes integrated reverse-battery protection rated to –22 V, making it suitable for direct connection to 24 V truck battery rails without external diodes or TVS devices. Its 2.7–5.5 V operating range is maintained via internal regulator; the A89103KETSR-5 draws only 1.8 mA at 5 V, minimizing heat generation even under continuous 24 V supply conditions.
A89103KETSR-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Optical Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- -
- Common Mode Transient Immunity (Min):
- -
- Propagation Delay tpLH / tpHL (Max):
- 400ns, 850ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Current - Output High, Low:
- -
- Current - Peak Output:
- -
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 4.5V ~ 85V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 150°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
- Approval Agency:
- -
A89103KETSR-5 FAQ
1.How can I place an order for A89103KETSR-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for A89103KETSR-5 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 A89103KETSR-5 reliable?
The price and inventory of A89103KETSR-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A89103KETSR-5 is usually 5 days.
3.What payment methods are accepted for A89103KETSR-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A89103KETSR-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A89103KETSR-5?
A89103KETSR-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A89103KETSR-5 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 A89103KETSR-5?
For technical support, including A89103KETSR-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A89103KETSR-5 requirements.
6.How does Aetrix verify that A89103KETSR-5 is sourced from the original manufacturer or authorized distributors?
All A89103KETSR-5 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 A89103KETSR-5 meets industry standards.
7.What is the process for return or replacement of A89103KETSR-5?
All A89103KETSR-5 units undergo pre-shipment inspection (PSI). If there is an issue with A89103KETSR-5, 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 A89103KETSR-5 part is unused and in its original packaging.
Return procedure for A89103KETSR-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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