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Diodes Incorporated AH373-PG-A
- Part No.:
- AH373-PG-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH373-PG-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
AH373-PG-A from Diodes Incorporated is a bipolar Hall-effect latch sensor with internal pull-up resistor, designed for high-temperature rotor position sensing in BLDC motor commutation. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical operate/release points (Bop/Brp), and functions across –40°C to +125°C in SIP-3 package.
For engineers reviewing the AH373-PG-A datasheet, AH373-PG-A pinout, AH373-PG-A application, or AH373-PG-A equivalent, this page provides verified magnetic thresholds, thermal derating curves, output driver capability, and package-specific layout guidance - all critical for motor control PCB design and automotive-grade reliability validation.
Technical Context
The AH373 integrates a Hall plate, chopper-stabilized amplifier, comparator with built-in hysteresis (~60G), and open-drain output stage with integrated 10kΩ pull-up resistor. Its band-gap regulator enables stable operation across the full 2.2–20V supply range while compensating for temperature drift in magnetic switching points.
It latches on when perpendicular magnetic flux exceeds Bop (e.g., South pole for SIP-3), holds state until flux reverses and falls below Brp, and maintains immunity to EMI via internal hysteresis and 100nF recommended bypass capacitor at VDD–GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 20V - supports direct connection to 12V automotive rails without external regulation |
| Output Sink Current | 25mA - drives standard optocouplers or logic-level MOSFET gates directly |
| Operating Temperature | –40°C to +125°C - qualified for under-hood motor control and industrial encoders |
| Magnetic Hysteresis | 60G typical - prevents chatter during slow or noisy field transitions |
| Internal Pull-up | 10kΩ ±30% - eliminates need for external resistor; sets logic-high level at VDD |
| Output On Voltage | 400mV max @ 20mA - ensures clean TTL/CMOS-compatible low-state margin |
| Power Dissipation (SIP-3) | 550mW @ 25°C - derates linearly to 0mW at 150°C per published curve |
Pinout & Package
SIP-3 package: 3-pin single-inline package with gull-wing leads, 0.51mm typical thickness, 14.0–15.0mm body length, and part marking surface on top face. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 2.2–20V; powers internal regulator, Hall plate, and output driver |
| 2 (GND) | Reference ground | Return path for supply and output sink current; must be low-impedance |
| 3 (OUTPUT) | Open-drain digital output | Sinks up to 25mA; pulled high internally to VDD via 10kΩ resistor |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires magnetic polarity reversal to toggle - ideal for direction-agnostic RPM counting |
| Integrated 10kΩ pull-up | Reduces BOM count and PCB area; eliminates routing of external resistor to VDD |
| Chopper-stabilized amplifier | Minimizes offset drift over temperature - maintains consistent Bop/Brp across –40°C to +125°C |
| Wide supply range (2.2–20V) | Operates directly from battery or unregulated DC bus - no LDO required |
| RoHS/Green compliant | Lead-free, halogen-free, antimony-free - meets IPC-1752A Class 2 reporting requirements |
Applications
| BLDC Motor Commutation | Rotary Encoder |
|---|---|
Use Scenario: Detecting rotor magnet position in 3-phase brushless DC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Digital position sensor providing synchronized edge-triggered signals to motor gate driver logic. Use Value: Enables precise 120° electrical phase alignment with <±5° angular error due to 60G hysteresis and low-tempco Bop/Brp. | Use Scenario: Converting mechanical rotation into quadrature or index pulse trains for position tracking. IC Role / Device Role / Timing Role: Bipolar latch generating clean, debounced digital pulses per pole pair crossing. Use Value: Delivers jitter-free output with <1µs propagation delay variation - supports >20kHz RPM measurement 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 zero-crossing detector feeding frequency-to-voltage converter or microcontroller timer input. Use Value: Maintains stable switching threshold across 125°C ambient - avoids false counts in thermally stressed enclosures. | Use Scenario: Isolating high-current load control using magnetic field from a current-carrying conductor. IC Role / Device Role / Timing Role: Threshold-based switch activated by field strength proportional to load current magnitude. Use Value: Eliminates galvanic isolation components; supports 5–50A sensing range with calibrated magnet geometry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3782-WG-7 | Higher Bop (45–90G), wider hysteresis (80G), SC59 only | Better noise immunity in EMI-heavy environments; not SIP-3 compatible | Select when higher magnetic immunity is needed and SIP-3 footprint is not required |
| US1881LUA-AAA-000 | Unipolar operation, 3.3–24V, 20mA sink, SOT23 only | Lacks polarity reversal requirement - simpler for one-directional sensing | Choose for cost-sensitive, non-reversing applications where latch memory is unnecessary |
Compared with AH373-PG-A, AH3782 offers superior noise rejection but sacrifices SIP-3 availability and design reuse; US1881LUA simplifies circuitry for unidirectional detection but cannot replace bipolar latching in motor commutation.
Availability
AH373-PG-A is available at Aetrix Electronics and suitable for BLDC motor control, industrial encoder modules, RPM monitoring systems, and contactless current switching requiring stable component supply across extended temperature ranges.
Supply support for AH373-PG-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The AH373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, high-temperature position sensing in automotive and industrial motion control systems.
FAQ
What is the magnetic polarity requirement for AH373-PG-A activation?
For SIP-3 package (AH373-PG-A), a South pole applied to the marked side triggers turn-on (Bop ≥ +30G). Output remains latched until a South pole weakens below Brp (≤ –30G) - polarity reversal is required. This behavior is confirmed in the datasheet's magnetic characteristics table and functional block diagram.
Can AH373-PG-A drive an LED directly?
Yes - with a 12V supply and 20mA sink current capability, AH373-PG-A can drive a standard 2V red LED with a 500Ω series resistor. The 400mV max VON ensures ≥10mA forward current, and the internal 10kΩ pull-up guarantees proper high-state voltage when off.
Is AH373-PG-A pin-compatible with other Diodes Hall latches in SIP-3?
No - AH373-PG-A uses VDD/GND/OUT pinout, but AH180x and AH377 variants in SIP-3 have different pin assignments (e.g., OUT/GND/VDD). Always verify pin mapping against the specific device's datasheet; physical compatibility does not guarantee electrical or functional equivalence.
Why is AH373-PG-A marked "NRND" in ordering information?
"NRND" (Not Recommended for New Design) indicates Diodes has introduced newer alternatives like AH3782 with improved specs, but AH373-PG-A remains fully manufactured and supported. Existing designs may continue using it; new designs should evaluate AH3782 for enhanced hysteresis and EMI performance.
AH373-PG-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH373-PG-A FAQ
1.How can I place an order for AH373-PG-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH373-PG-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 AH373-PG-A reliable?
The price and inventory of AH373-PG-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH373-PG-A is usually 5 days.
3.What payment methods are accepted for AH373-PG-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH373-PG-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH373-PG-A?
AH373-PG-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH373-PG-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 AH373-PG-A?
For technical support, including AH373-PG-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH373-PG-A requirements.
6.How does Aetrix verify that AH373-PG-A is sourced from the original manufacturer or authorized distributors?
All AH373-PG-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 AH373-PG-A meets industry standards.
7.What is the process for return or replacement of AH373-PG-A?
All AH373-PG-A units undergo pre-shipment inspection (PSI). If there is an issue with AH373-PG-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 AH373-PG-A part is unused and in its original packaging.
Return procedure for AH373-PG-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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