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Diodes Incorporated AH3725Q-SA-7
- Part No.:
- AH3725Q-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3725Q-SA-7.pdf
- Description:
- HALL LATCH SWITCH SSOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,722
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Product details
Overview
AH3725Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect bipolar latch IC designed for position sensing and BLDC motor commutation in high-temperature, high-voltage environments. It operates from 3.0V to 28V, features BOP/BRP of 50–90G / –90––50G (typ), delivers <0.4V output saturation at 20mA, and supports –40°C to +150°C ambient operation with chopper-stabilized offset cancellation.
For engineers reviewing the AH3725Q-SA-7 datasheet, AH3725Q-SA-7 pinout, AH3725Q-SA-7 application, or AH3725Q-SA-7 equivalent, key selection criteria include magnetic sensitivity hysteresis (140G typ), open-drain output current limit (30–55mA), reverse supply protection (–18V), ESD robustness (8kV HBM), and SC59/SOT23/SIP-3 package compatibility for space-constrained automotive sensor nodes.
Technical Context
The AH3725Q-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, enabling stable switching thresholds across temperature and supply voltage. Its bipolar latch behavior-South pole activation and North pole release-is polarity-inverted between SC59 and SOT23/SIP-3 packages due to die orientation differences.
Internal bandgap regulation supplies temperature-compensated bias to analog blocks, while integrated reverse-blocking diode and zener clamp protect VDD against transients up to 32V. The single open-drain output includes overcurrent limiting and is specified for ≤1µs rise/fall times with 1kΩ pull-up and 20pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - Enables direct connection to automotive battery rails without external regulators. |
| BOP / BRP (typ) | 70G / –70G - High-sensitivity latching threshold optimized for small air gaps and low-field magnets. |
| Hysteresis BHY (typ) | 140G - Prevents chatter in noisy magnetic environments; supports reliable edge detection in RPM sensing. |
| VOUT_ON @ 20mA | ≤0.4V - Ensures strong logic-low assertion into standard CMOS/TTL inputs under full load. |
| Startup Time | 10µs - Fast enable after power-on, critical for real-time motor commutation timing. |
| Operating Temperature | –40°C to +150°C - Qualified for under-hood placement in engine control, transmission, and EPS modules. |
| ESD Robustness | 8kV HBM / 1kV CDM - Meets automotive assembly and field-reliability requirements without added protection circuitry. |
Pinout & Package
Package: SC59 (JEDEC TO-92 variant), SOT23 (Type S), SIP-3 (Ammo and Bulk Pack) - all lead-free, RoHS- and "Green"-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp (–18V/28V); requires 10nF–100nF bypass capacitor. |
| 2 | GND | Ground reference for internal regulator and output stage; must be low-impedance for noise immunity. |
| 3 | OUTPUT | Open-drain output with 30–55mA current limit; requires external pull-up resistor (RL) to interface with MCU or logic. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | South pole activates output (low), North pole releases it - enables absolute position detection without continuous field monitoring. |
| Chopper-Stabilized Architecture | Reduces thermal drift of BOP/BRP to ±10G over –40°C to +150°C - eliminates need for system-level calibration. |
| Integrated Protection | Reverse supply diode + VDD zener clamp (28V) + output overcurrent limit - reduces external component count in harsh automotive environments. |
| AEC-Q100 Grade 0 Qualification | Validated for 150°C junction operation with PPAP capability and IATF16949 manufacturing - meets Tier-1 functional safety requirements. |
| RF Noise Immunity | Enhanced layout and filtering suppress common-mode EMI up to 1GHz - maintains stable switching in high-noise powertrain systems. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet position in 12V/24V automotive fan, pump, or HVAC blower motors. IC Role / Device Role / Timing Role: Bipolar latch provides precise, jitter-free commutation edges synchronized to mechanical rotation. Use Value: Enables efficient 6-step or sinusoidal drive with <10µs startup latency and no external biasing components. |
Use Scenario: Counting gear tooth or camshaft passage in engine management systems. IC Role / Device Role / Timing Role: Converts magnetic transitions into clean digital pulses for microcontroller frequency measurement. Use Value: Delivers accurate RPM readings down to 0 rpm with hysteresis preventing false counts from vibration-induced field noise. |
| Steering Angle Sensing | Transmission Position Detection |
|
Use Scenario: Contactless angular position feedback in electric power steering (EPS) column modules. IC Role / Device Role / Timing Role: Latched output tracks magnet polarity reversal as steering wheel rotates past zero-crossing points. Use Value: Supports ASIL-B functional safety architecture with guaranteed –40°C to +150°C operation and AEC-Q100 traceability. |
Use Scenario: Gear selector position verification in automatic transmissions using rotating ferrous targets. IC Role / Device Role / Timing Role: Provides deterministic on/off states corresponding to P/R/N/D positions via fixed magnet alignment. Use Value: Eliminates mechanical switch wear and contact bounce; withstands oil immersion and thermal cycling per GMW3172. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1220LLHLT-T | Lower sensitivity (BOP = 25G typ), wider hysteresis (120G), no reverse supply protection. | Suitable for lower-cost cabin sensors but not under-hood high-field applications requiring >50G BOP. | Select AH3725Q-SA-7 when operating near 28V rails or in environments with frequent reverse-battery events. |
| Melexis US1881EUA-ABA-000-SP | Higher BOP (110G typ), SC59-only packaging, no AEC-Q100 Grade 0 qualification. | Targeted at industrial encoders; lacks PPAP support and extended temperature validation for automotive production. | Choose AH3725Q-SA-7 for OEM programs requiring full automotive change control, IATF16949 traceability, and –40°C to +150°C conformance. |
Compared with A1220LLHLT-T and US1881EUA-ABA-000-SP, the AH3725Q-SA-7 uniquely combines high-field sensitivity (70G BOP), full AEC-Q100 Grade 0 qualification, reverse-supply protection, and multi-package availability - making it the only option qualified for safety-critical, high-voltage automotive position sensing where reliability and supply resilience are non-negotiable.
Availability
AH3725Q-SA-7 is available at Aetrix Electronics and suitable for BLDC motor commutation, RPM measurement, and transmission position detection requiring stable component supply across automotive production lifecycles.
Supply support for AH3725Q-SA-7 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets, with ISO/TS 16949-certified manufacturing.
The AH372XQ series was developed specifically for AEC-Q100-compliant automotive position sensing, emphasizing high-voltage resilience, wide temperature operation, and magnetic stability in harsh under-hood environments.
FAQ
What is the magnetic polarity requirement for AH3725Q-SA-7 activation?
The AH3725Q-SA-7 requires a South pole applied to the marked side of SOT23 (Type S) and SIP-3 packages, but to the unmarked side of SC59 packages. This polarity inversion is due to die orientation differences across packages and is confirmed in the datasheet's magnetic diagrams. Always verify package type before magnet placement.
Does AH3725Q-SA-7 require an external pull-up resistor?
Yes - the device has an open-drain output and requires an external pull-up resistor (RL) to VDD or another logic rail. Recommended values range from 1kΩ to 10kΩ depending on rise time and bus loading; RL = 1kΩ yields ≤1µs rise time with 20pF load, per datasheet characterization.
Can AH3725Q-SA-7 operate directly from a 24V truck battery?
Yes - its 3.0V to 28V operating range and 32V absolute maximum VDD rating allow direct connection to 24V systems. Integrated reverse-blocking diode and zener clamp protect against load-dump transients and accidental reverse-battery connection up to –18V, eliminating need for external protection diodes.
How does chopper stabilization improve performance in AH3725Q-SA-7?
Chopper stabilization dynamically cancels offset voltage in the Hall element and amplifier chain, reducing BOP/BRP drift to ±10G over –40°C to +150°C. This eliminates thermal recalibration, ensures consistent switching thresholds across temperature swings, and enhances immunity to mechanical stress-induced offset shifts in vibrating automotive mounts.
AH3725Q-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Latch, Bipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±6mT Trip, ±0.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Digital
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3725Q-SA-7 FAQ
1.How can I place an order for AH3725Q-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3725Q-SA-7 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 AH3725Q-SA-7 reliable?
The price and inventory of AH3725Q-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3725Q-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3725Q-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3725Q-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3725Q-SA-7?
AH3725Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3725Q-SA-7 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 AH3725Q-SA-7?
For technical support, including AH3725Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3725Q-SA-7 requirements.
6.How does Aetrix verify that AH3725Q-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3725Q-SA-7 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 AH3725Q-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3725Q-SA-7?
All AH3725Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3725Q-SA-7, 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 AH3725Q-SA-7 part is unused and in its original packaging.
Return procedure for AH3725Q-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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