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Diodes Incorporated AH373-SA-7
- Part No.:
- AH373-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH373-SA-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
AH373-SA-7 from Diodes Incorporated is a bipolar Hall-effect latch sensor in SOT23 package, featuring internal pull-up resistor, 2.2–20 V supply range, -40°C to +125°C operation, and 25 mA output sink capability. It detects magnetic flux reversal for motor commutation, RPM sensing, and contactless switching in high-temperature industrial motion control systems.
For engineers reviewing the AH373-SA-7 datasheet, AH373-SA-7 pinout, AH373-SA-7 application, or AH373-SA-7 equivalent, this page delivers verified magnetic thresholds (Bop = 5–60 Gauss, Brp = -60 to -5 Gauss), thermal derating curves, package-specific power dissipation limits, and real-world use cases in three-phase BLDC motor control and encoder feedback loops.
Technical Context
The AH373-SA-7 integrates a Hall plate, amplifier, comparator with hysteresis (Bhy ≥ 60 Gauss), and open-drain output driver with built-in 7–13 kΩ pull-up resistor. Its band-gap regulator enables stable internal biasing across 2.2–20 V supply, supporting wide-input industrial power rails.
Magnetic switching is polarity-dependent: for SOT23, South pole applied to part-marking side triggers turn-on at Bop ≥ 5 Gauss; release occurs at Brp ≤ -5 Gauss upon field reversal. Output remains latched until magnetic reversal crosses Brp, ensuring noise-immune digital state retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 20 V - supports direct connection to 3.3 V, 5 V, 12 V, and 24 V industrial rails without external regulation |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
| Output Sink Current | 25 mA - drives standard logic inputs, optocouplers, or small MOSFET gates directly |
| Magnetic Hysteresis | ≥60 Gauss - prevents chatter near switching threshold in noisy EMI environments |
| Internal Pull-up Resistor | 7–13 kΩ - eliminates need for external pull-up, reducing BOM count and PCB area |
| Output On Voltage | ≤400 mV @ 20 mA - ensures clean low-state logic compatibility with TTL and CMOS inputs |
| Power Dissipation (SOT23) | 230 mW @ 25°C, derates to 46 mW @ 125°C - defines maximum continuous current under thermal constraints |
Pinout & Package
The AH373-SA-7 is packaged in SOT23 - a 3-pin surface-mount package with gull-wing leads, 2.4 mm × 2.9 mm footprint, and 0.95 mm height - optimized for compact motor control PCBs and high-density encoder modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive Supply Input | Accepts 2.2–20 V DC; powers internal regulator, Hall plate, and output stage |
| 2 (GND) | Ground Reference | Common return path for supply and output current; must be low-impedance for noise immunity |
| 3 (OUT) | Open-Drain Output | Sinks up to 25 mA when active; pulled high internally via 7–13 kΩ resistor when inactive |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | Requires magnetic polarity reversal to toggle output - enables robust position detection in rotating systems without continuous field monitoring |
| Integrated Pull-up Resistor | 7–13 kΩ on-chip - removes external component, simplifies layout, and guarantees consistent rise time across temperature |
| Wide Supply Range | 2.2–20 V - accommodates battery-powered, 12 V automotive, and 24 V industrial supplies without external regulators |
| High-Temperature Rating | -40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood motor control applications |
| Noise-Rejecting Hysteresis | ≥60 Gauss - suppresses false triggering from EMI, vibration-induced field fluctuations, or mechanical bounce |
Applications
| Motor Commutation Sensing | Rotary Encoder Feedback |
|---|---|
Use Scenario: Detecting rotor position in 3-phase BLDC motors to sequence phase winding energization. IC Role / Device Role / Timing Role: Digital Hall latch providing synchronized edge-triggered signals for electronic commutation timing. Use Value: Enables precise 120° electrical angle alignment with <±5 Gauss magnetic tolerance, minimizing torque ripple and acoustic noise. | Use Scenario: Converting shaft rotation into quadrature or index pulses for speed and direction measurement. IC Role / Device Role / Timing Role: Bipolar latch generating clean, hysteresis-stabilized digital edges per pole pair passage. Use Value: Delivers jitter-free pulse trains up to 50 kHz with no external debouncing, supporting RPM monitoring to ±1% accuracy. |
| RPM Monitoring System | Contactless Current Switch |
Use Scenario: Measuring rotational speed of fans, pumps, or conveyors in HVAC and industrial automation. IC Role / Device Role / Timing Role: Magnetic threshold detector converting gear tooth or magnet passage into fixed-frequency square wave. Use Value: Maintains reliable switching down to 0.5 Hz input frequency and up to 10 kHz, enabling low-RPM diagnostics and overspeed protection. | Use Scenario: Isolating control logic from high-current load circuits using magnetic field coupling instead of mechanical contacts. IC Role / Device Role / Timing Role: Solid-state switch activated by proximity of current-carrying conductor's magnetic field. Use Value: Achieves >1 million operations lifetime with zero contact wear, eliminating arcing and maintenance in 24 V DC load switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL373-SR-7 | Same pinout, identical Bop/Brp specs, but rated only to +105°C (vs. +125°C) | Limited to commercial/industrial ambient, not suitable for under-hood or high-temp motor housings | Select when thermal margin is sufficient and cost sensitivity outweighs extended temperature qualification |
| US1881LUA-AAA-000 | Higher Bop (35–75 Gauss), no internal pull-up - requires external 10 kΩ resistor | Better noise immunity in high-field environments, but adds BOM item and layout complexity | Choose where stronger magnetic fields exist and board space allows discrete pull-up placement |
Compared with AL373-SR-7 and US1881LUA-AAA-000, the AH373-SA-7 uniquely combines full automotive-grade temperature range, integrated pull-up, and industry-standard SOT23 footprint - making it optimal for space-constrained, thermally demanding motor control designs where bill-of-materials reduction is critical.
Availability
AH373-SA-7 is available at Aetrix Electronics and suitable for motor commutation sensing, rotary encoder feedback, and RPM monitoring requiring stable component supply in industrial embedded systems, automotive subsystems, and factory automation equipment.
Supply support for AH373-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 ICs, with design centers in Asia, Europe, and the U.S., and manufacturing facilities in China, Taiwan, and the Philippines.
The AH373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-reliability position and speed sensing in harsh thermal and electromagnetic environments of motor control, industrial automation, and automotive electrification systems.
FAQ
What is the magnetic polarity requirement for AH373-SA-7 activation?
For the SOT23 package (AH373-SA-7), a South pole applied to the part-marking side triggers turn-on at Bop ≥ 5 Gauss. The output remains latched until field reversal brings flux below Brp ≤ -5 Gauss. This bipolar latch behavior is confirmed in the functional block diagram and magnetic characteristics table of DS31173 Rev. 12-3.
Can AH373-SA-7 operate reliably at 2.2 V supply?
Yes - the device switches output above 2.2 V, but magnetic performance (Bop/Brp) is fully specified only above 2.5 V. At 2.2 V, output logic functions correctly, though magnetic thresholds may shift slightly; for production designs, 2.5 V minimum is recommended to guarantee datasheet-compliant sensing accuracy.
Is an external bypass capacitor required for AH373-SA-7?
Yes - a 100 nF ceramic capacitor between VDD and GND is recommended per the Typical Application Circuit in DS31173. It stabilizes the internal regulator, improves noise immunity against supply transients, and ensures consistent switching behavior in electrically noisy motor drive environments.
Why is AH373-SA-7 marked "NRND" in the ordering information?
"NRND" (Not Recommended for New Design) reflects Diodes Incorporated's product lifecycle status - the AH373 family remains fully available and supported, but newer alternatives like AH3782 offer enhanced features. AH373-SA-7 continues to ship with full datasheet compliance, long-term availability commitments, and unchanged specifications for legacy and cost-optimized designs.
AH373-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:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH373-SA-7 FAQ
1.How can I place an order for AH373-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH373-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 AH373-SA-7 reliable?
The price and inventory of AH373-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 AH373-SA-7 is usually 5 days.
3.What payment methods are accepted for AH373-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH373-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH373-SA-7?
AH373-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH373-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 AH373-SA-7?
For technical support, including AH373-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH373-SA-7 requirements.
6.How does Aetrix verify that AH373-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH373-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 AH373-SA-7 meets industry standards.
7.What is the process for return or replacement of AH373-SA-7?
All AH373-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH373-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 AH373-SA-7 part is unused and in its original packaging.
Return procedure for AH373-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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