My Inquiry
My Account
Diodes Incorporated AH3725Q-P-A
- Part No.:
- AH3725Q-P-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH3725Q-P-A.pdf
- Description:
- HALL LATCH SWITCH SIP-3 AMMO 1K
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AH3725Q-P-A from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect bipolar latch IC designed for brushless DC motor commutation and angular position sensing in high-temperature engine bay environments. It operates from 3.0V to 28V, features BOP/BRP of 50–90G / –90G to –50G (typ), delivers <0.4V output saturation at 20mA, and supports –40°C to +150°C ambient operation.
For engineers reviewing the AH3725Q-P-A datasheet, AH3725Q-P-A pinout, AH3725Q-P-A application, or AH3725Q-P-A equivalent, key selection criteria include magnetic sensitivity tolerance across temperature, open-drain output current limit (30–55mA), chopper-stabilized switch point drift performance, and package-specific pole orientation requirements for SOT23/SC59/SIP-3 variants.
Technical Context
The AH3725Q-P-A uses a chopper-stabilized architecture with dynamic offset cancellation to minimize thermal drift of magnetic thresholds-BOP and BRP shift less than ±15G over –40°C to +150°C at VDD = 12V. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable switching behavior across full automotive voltage and temperature ranges.
It implements bipolar latching logic: South pole applied to the marked side (SOT23/SIP-3) or unmarked side (SC59) switches the open-drain output low; reversal to North pole below BRP releases the latch. The output includes overcurrent limiting (IOCL = 30–55mA) and zener clamping (VZ = 28V), while supply protection integrates reverse-blocking diode and zener clamp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - Supports direct battery connection in 12V/24V automotive systems without external regulation. |
| Operating Temperature | –40°C to +150°C - Qualified for under-hood placement per AEC-Q100 Grade 0. |
| BOP / BRP (typ) | 70G / –70G - Enables reliable detection of moderate-strength magnets in compact motor or gear-sensing layouts. |
| Output Saturation | ≤0.4V @ 20mA - Ensures clean logic-low level into standard pull-up resistors (e.g., 1kΩ–10kΩ). |
| Startup Time | 10µs - Allows rapid response after ignition power-on; output valid within 10µs of VDD reaching 3V. |
| Hysteresis (BHY) | 140G (typ) - Prevents chatter near threshold by enforcing ≥140G magnetic gap between turn-on and release points. |
| ESD Robustness | HBM 8kV, CDM 1kV - Meets stringent automotive ESD immunity requirements for assembly and field operation. |
Pinout & Package
Available in SC59, SOT23 (Type S), and SIP-3 packages. Pin numbering and function are identical across all variants: Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp; accepts transients up to 32V (non-operational stress rating). |
| 2 | GND | Reference ground for internal regulator and output stage; must be low-impedance for stable chopper operation. |
| 3 | OUTPUT | Open-drain NMOS output with 30–55mA current limit; requires external pull-up for logic-high; sinks current when latched ON. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized sensing | Reduces thermal drift of BOP/BRP to ±15G over full temperature range-critical for consistent RPM measurement in hot engine compartments. |
| Bipolar latch polarity mapping | South-pole activation on part-marking side for SOT23/SIP-3; opposite for SC59-enables mechanical design flexibility in sensor mounting orientation. |
| Integrated supply protection | Reverse-blocking diode + 28V zener clamp on VDD-eliminates need for external TVS in most 12V/24V automotive circuits. |
| High ESD immunity | 8kV HBM rating-survives handling and system-level ESD events without functional degradation or latent failure. |
| Low quiescent current | Max 5mA IDD over –40°C to +150°C-minimizes parasitic drain on vehicle battery during sleep modes. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
Use Scenario: Detecting rotor magnet position in 3-phase BLDC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Bipolar latch provides edge-triggered, hysteresis-protected digital position feedback synchronized to magnet pole transitions. Use Value: 140G hysteresis prevents false triggering during vibration or flux ripple; 10µs startup enables immediate operation post-ignition. |
Use Scenario: Counting magnetic pole transitions on rotating shafts to compute real-time rotational speed. IC Role / Device Role / Timing Role: Latched output delivers clean, jitter-free pulse train to microcontroller timer inputs or dedicated RPM ICs. Use Value: Chopper stabilization ensures consistent pulse width and edge timing across –40°C to +150°C-no calibration required. |
| Throttle Position Sensing | Transmission Gear Position Detection |
Use Scenario: Monitoring angular displacement of throttle body lever via embedded magnet and fixed Hall sensor. IC Role / Device Role / Timing Role: Provides discrete ON/OFF state indicating throttle quadrant (e.g., idle, partial, WOT) based on magnet proximity. Use Value: 70G operate point allows use of small, cost-effective ferrite magnets; AEC-Q100 qualification ensures long-term reliability. |
Use Scenario: Detecting gear selector lever position in automatic transmissions using multi-pole ring magnet and Hall array. IC Role / Device Role / Timing Role: Each AH3725Q-P-A in the array senses one gear detent position via latched magnetic state change. Use Value: Open-drain output interfaces directly with 3.3V/5V MCU GPIO; 28V tolerant VDD simplifies power routing in transmission control units. |
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 A1220LUA-T | Wider BOP range (±20G to ±120G), but only AEC-Q100 Grade 1 (–40°C to +125°C); no integrated reverse-supply protection. | Limited to cabin or cooler under-dash locations; requires external reverse-polarity protection diode. | Select if lower sensitivity (20G BOP) is needed for weak-field detection, and Grade 1 temp range suffices. |
| Melexis US1881EUA-ABA-000-REEL | Higher sensitivity (BOP = ±35G typ), but max VDD = 24V and no AEC-Q100 qualification; HBM ESD = 4kV. | Not approved for safety-critical or engine-compartment use; suitable for non-automotive industrial encoders. | Choose only for cost-sensitive non-automotive designs where AEC-Q100 and 28V operation are not required. |
Compared with A1220LUA-T and US1881EUA, AH3725Q-P-A uniquely combines AEC-Q100 Grade 0 qualification, 28V operation, integrated reverse-supply protection, and 140G hysteresis-making it the only option qualified for direct engine-bay BLDC commutation and high-reliability automotive position sensing.
Availability
AH3725Q-P-A is available at Aetrix Electronics and suitable for brushless DC motor control, automotive RPM monitoring, throttle position sensing, and transmission gear indexing requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3725Q-P-A 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.
The AH372XQ series belongs to Diodes' automotive-qualified Hall-effect sensor product line, engineered specifically for robust, high-temperature position and speed sensing in demanding engine, transmission, and chassis systems.
FAQ
What is the correct magnet polarity orientation for AH3725Q-P-A in SOT23 package?
For SOT23 (Type S) and SIP-3 packages, apply the South pole to the side with the part marking to activate the output (pull low). The North pole must then be presented to the same side to release the latch. This polarity mapping is reversed for SC59-South pole must face the unmarked side. Confirmed in DS46144 Rev. 3–2, page 4.
Does AH3725Q-P-A require an external bypass capacitor?
Yes-a 10nF to 100nF ceramic capacitor (CIN) is required between VDD and GND, placed as close as possible to the device pins. This stabilizes the internal bandgap regulator and enhances RF noise immunity, as specified in the Typical Applications Circuit on page 3 of DS46144 Rev. 3–2.
Can AH3725Q-P-A drive a 10kΩ pull-up resistor directly?
Yes-the output is rated for 60mA continuous sink current and exhibits ≤0.4V saturation at 20mA. With a 10kΩ pull-up to 12V, sink current is ~1.2mA, well within rating and ensuring a solid logic-low (<0.4V) and fast fall time (<1µs typical). RL value affects rise time only.
Is AH3725Q-P-A pin-compatible with other AH372XQ variants?
Yes-all AH372XQ variants (AH3722Q through AH3729Q) share identical SC59/SOT23/SIP-3 pinouts, electrical interface, and functional block diagram. Only magnetic thresholds (BOP/BRP) differ; no PCB or firmware changes are needed when substituting within the family for sensitivity tuning.
AH3725Q-P-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3725Q-P-A FAQ
1.How can I place an order for AH3725Q-P-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3725Q-P-A 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-P-A reliable?
The price and inventory of AH3725Q-P-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3725Q-P-A is usually 5 days.
3.What payment methods are accepted for AH3725Q-P-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3725Q-P-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3725Q-P-A?
AH3725Q-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3725Q-P-A 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-P-A?
For technical support, including AH3725Q-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3725Q-P-A requirements.
6.How does Aetrix verify that AH3725Q-P-A is sourced from the original manufacturer or authorized distributors?
All AH3725Q-P-A 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-P-A meets industry standards.
7.What is the process for return or replacement of AH3725Q-P-A?
All AH3725Q-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH3725Q-P-A, 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-P-A part is unused and in its original packaging.
Return procedure for AH3725Q-P-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AH3725Q-P-A Tags
-
TCS40DLR,LF
Toshiba Semiconductor and Storage
-
DRV5032FBDBZR
Texas Instruments
-
DRV5032FADBZR
Texas Instruments
-
AH1912-FA-7
Diodes Incorporated
-
AH1913-W-7
Diodes Incorporated
-
AH1911-W-7
Diodes Incorporated
-
TLI49631MXTSA1
Infineon Technologies
-
SM453R
Honeywell Sensing and Productivity Solutions
-
MLX90248ESE-EBA-000-RE
Melexis Technologies NV
-
MLX92213ELD-AAA-000-RE
Melexis Technologies NV
-
TLE4913HTSA1
Infineon Technologies
-
US5781ESE-AAA-000-RE
Melexis Technologies NV
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
