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Diodes Incorporated AH373-SAC-7
- Part No.:
- AH373-SAC-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH373-SAC-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,048
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Product details
Overview
AH373-SAC-7 from Diodes Incorporated is a bipolar Hall-effect latch sensor in SOT23 package with integrated pull-up resistor, 2.2–20 V supply range, -40°C to +125°C operation, and 25 mA output sink capability-designed for rotor position sensing in three-phase BLDC motor commutation.
For engineers reviewing the AH373-SAC-7 datasheet, AH373-SAC-7 pinout, AH373-SAC-7 application, or AH373-SAC-7 equivalent, this page delivers verified magnetic thresholds (Bop = 5–60 Gauss, Brp = -60 to -5 Gauss), internal 7–13 kΩ pull-up, VOUT(SAT) ≤ 400 mV at 20 mA, and thermal derating curves for SIP-3, SC59, and SOT23 packages.
Technical Context
The AH373-SAC-7 implements a monolithic Hall-effect latch with on-chip band-gap regulator, differential Hall plate, chopper-stabilized amplifier, Schmitt-trigger comparator with hysteresis (Bhy ≥ 60 Gauss), and open-drain NMOS output stage with internal pull-up resistor. It operates in bipolar mode: South pole activates output (low), North pole releases it (high) for SC59/SOT23 orientation.
Magnetic switching is referenced to the package marking side-South pole for SIP-3 and SOT23, North pole for SC59-and functions reliably across 2.5–20 V supply; below 2.5 V, magnetic response is non-specified. Output remains latched until field reversal crosses Brp, enabling robust noise immunity in motor control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 20 V - supports wide-input industrial and automotive power rails without external regulation |
| Output Sink Current | 25 mA - drives standard logic inputs and small relays directly without buffer stage |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and industrial motor control environments |
| Bop / Brp | 5–60 Gauss / -60 to -5 Gauss - provides reliable latching with ≥60 Gauss hysteresis for vibration-resistant position detection |
| Internal Pull-up | 7–13 kΩ - eliminates need for external pull-up resistor, reducing BOM count and PCB area |
| VOUT(SAT) | ≤ 400 mV @ 20 mA - ensures clean TTL/CMOS-compatible low-state even at full load |
| Supply Current | 2–4 mA @ TA = 25°C - enables low-power operation in battery-backed or energy-sensitive systems |
Pinout & Package
Package: SOT23 (3-pin, surface-mount, 2.4 mm × 2.9 mm × 1.1 mm). Pinout validated per Diodes DS31173 Rev. 14–4, Figure 1 (Top View).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 2.2–20 V; powers internal regulator, Hall plate, and output driver |
| 2 - GND | Ground reference | Common return path for supply and output current; must be low-impedance |
| 3 - OUT | Open-drain digital output | Sinks up to 25 mA; pulled high internally (7–13 kΩ); requires no external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Switches ON with South pole (SOT23/SIP-3), OFF with North pole reversal-enables direction-agnostic rotor indexing |
| Integrated pull-up resistor | 7–13 kΩ internal pull-up eliminates discrete component, reduces layout complexity and failure points |
| Wide supply voltage range | 2.2–20 V operation allows direct connection to 3.3 V, 5 V, 12 V, or 24 V rails without LDO |
| High-temperature capability | Specified performance from -40°C to +125°C ambient-supports engine bay, pump, and HVAC motor applications |
| Chopper-stabilized amplifier | Reduces offset drift and 1/f noise, ensuring stable Bop/Brp over temperature and lifetime |
Applications
| Motor Commutation | Rotary Encoder |
|---|---|
|
Use Scenario: Detecting rotor pole position in 3-phase BLDC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Digital Hall latch providing synchronized edge-triggered signals to motor driver ICs (e.g., DRV8301, STSPIN32F0A). Use Value: Enables precise 120° electrical phase alignment with ±5 Gauss repeatability, eliminating mechanical brushes and wear. |
Use Scenario: Converting shaft rotation into quadrature A/B pulse streams for position tracking in servo actuators. IC Role / Device Role / Timing Role: Bipolar latch generating index pulses per pole pair; used with dual AH373s for direction-sensitive quadrature output. Use Value: Delivers deterministic hysteresis (≥60 Gauss) to suppress false triggering from mechanical vibration or EMI in closed-loop motion control. |
| RPM Monitoring | Contactless Current Switch |
|
Use Scenario: Measuring rotational speed of fans, pumps, or conveyors via magnetic target wheel. IC Role / Device Role / Timing Role: Edge-detecting latch feeding frequency-to-voltage converter or microcontroller timer input. Use Value: 25 mA sink drive directly interfaces with MCU GPIO or optocoupler inputs without level-shifting or buffering. |
Use Scenario: Isolating current flow detection in DC power lines using magnetic field around conductor. IC Role / Device Role / Timing Role: Threshold-based switch activated by field strength proportional to conductor current (e.g., 10 A → ~30 Gauss at 2 mm gap). Use Value: Eliminates shunt resistor losses and isolation barriers; operates with <0.1 µA leakage when inactive. |
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 A3295LUA-T | Higher Bop (35–75 Gauss), wider temp range (-40°C to +150°C), but no internal pull-up (requires external 10 kΩ) | Preferred for high-temp automotive under-hood use where external pull-up is acceptable | Select if junction temperature exceeds +125°C or if tighter Bop tolerance is required |
| Melexis US1881EUA-ABA-000-REEL | Lower supply range (3.5–24 V), higher output sink (30 mA), integrated reverse-polarity protection | Suitable for 12/24 V systems with potential supply reversal; lacks specified hysteresis value | Choose when reverse-battery protection is mandatory and Bhy ≥ 60 Gauss is not critical |
Compared with A3295LUA-T and US1881EUA, AH373-SAC-7 offers unique integration of internal pull-up and guaranteed ≥60 Gauss hysteresis within its 2.2–20 V range-making it optimal for cost-sensitive, space-constrained motor control designs where external components must be minimized.
Availability
AH373-SAC-7 is available at Aetrix Electronics and suitable for BLDC motor commutation, RPM monitoring, rotary encoders, and contactless current switching requiring stable component supply across industrial and automotive programs.
Supply support for AH373-SAC-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial, automotive, and consumer markets.
The AH373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, low-cost rotor position and speed feedback in brushless DC motor systems-emphasizing latch stability, wide voltage operation, and high-temperature reliability.
FAQ
What is the magnetic polarity sensitivity of AH373-SAC-7?
The AH373-SAC-7 responds to South pole magnetic fields applied to the marked side of the SOT23 package to activate the output (pull low); release occurs when the field reverses and falls below the release point (Brp). This bipolar latch behavior is fixed per package type and cannot be reconfigured.
Does AH373-SAC-7 require an external capacitor?
Yes-a 100 nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve noise immunity. This capacitor must be placed within 5 mm of the VDD/GND pins to maintain switching integrity in electrically noisy motor environments.
Can AH373-SAC-7 operate below 2.5 V?
The device powers on at VDD ≥ 2.2 V, but magnetic switching characteristics (Bop/Brp) are only guaranteed above 2.5 V. Below 2.5 V, output may remain static or behave unpredictably-designs requiring reliable Hall response must maintain VDD > 2.5 V during active sensing.
Is AH373-SAC-7 pin-compatible with other Diodes Hall latches?
No-AH373-SAC-7 uses a 3-pin SOT23 footprint with VDD-GND-OUT ordering. It is not pin-compatible with AH3782 (successor, same pinout but different magnetic specs) or AH180x series (different pin assignments and output types). Always verify pin mapping against the specific package drawing.
AH373-SAC-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-SAC-7 FAQ
1.How can I place an order for AH373-SAC-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH373-SAC-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-SAC-7 reliable?
The price and inventory of AH373-SAC-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-SAC-7 is usually 5 days.
3.What payment methods are accepted for AH373-SAC-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH373-SAC-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH373-SAC-7?
AH373-SAC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH373-SAC-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-SAC-7?
For technical support, including AH373-SAC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH373-SAC-7 requirements.
6.How does Aetrix verify that AH373-SAC-7 is sourced from the original manufacturer or authorized distributors?
All AH373-SAC-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-SAC-7 meets industry standards.
7.What is the process for return or replacement of AH373-SAC-7?
All AH373-SAC-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH373-SAC-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-SAC-7 part is unused and in its original packaging.
Return procedure for AH373-SAC-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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