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Diodes Incorporated AH373-PL-B
- Part No.:
- AH373-PL-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH373-PL-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,504
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Product details
Overview
AH373-PL-B from Diodes Incorporated is a bipolar Hall-effect latch sensor with integrated 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 maintains stable switching hysteresis across –40°C to +125°C in SIP-3 package.
For engineers reviewing the AH373-PL-B datasheet, AH373-PL-B pinout, AH373-PL-B application, or AH373-PL-B equivalent, this page provides verified magnetic thresholds, thermal derating curves, internal pull-up resistance (7–13kΩ), output saturation voltage (≤400mV @20mA), and package-specific pad layout guidance for reliable PCB integration.
Technical Context
The AH373 integrates a Hall plate, chopper-stabilized amplifier, comparator with built-in hysteresis (~60G), and open-drain output driver with monolithic 10kΩ pull-up resistor. Its band-gap regulator enables operation across 2.2–20V while compensating for temperature drift in magnetic thresholds and supply current.
Switching behavior is defined by bipolar latching: output pulls low when perpendicular flux exceeds Bop (e.g., 30G South pole for SIP-3), remains latched until reverse flux falls below Brp (e.g., –30G), ensuring noise immunity in electrically noisy motor environments without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 2.2V to 20V - Supports direct connection to 12V/24V motor control rails without regulation |
| Output Sink Current | 25mA - Drives standard logic inputs or small MOSFET gates directly |
| Bop / Brp | +30G / –30G typ - Enables precise rotor pole detection with 60G hysteresis for bounce-free switching |
| Supply Current | 2–4mA @25°C - Low quiescent draw suitable for battery-backed or always-on RPM monitoring |
| Internal Pull-up | 7–13kΩ - Eliminates need for external resistor; sets logic-high level at VDD when output is off |
| Output Saturation | ≤400mV @20mA - Ensures clean TTL/CMOS-compatible low-state even under full load |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive and industrial motor drive environments |
Pinout & Package
Package: SIP-3 (Straight Lead, Bulk Pack). Compact 3-pin single-inline package with 0.1" lead pitch, optimized for through-hole mounting in space-constrained motor housings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power Supply Input | Accepts 2.2–20V; powers internal regulator, Hall plate, and output stage |
| 2 - GND | Ground Reference | Return path for supply current and output sink current; must be low-impedance |
| 3 - OUT | Open-Drain Output | Sinks up to 25mA; pulled high internally to VDD via 10kΩ resistor when inactive |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | Retains output state after magnetic trigger-enables position memory without microcontroller polling |
| Integrated Pull-up Resistor | 7–13kΩ on-chip - Reduces BOM count and PCB footprint vs. discrete resistor solutions |
| Wide Supply Range | 2.2V–20V - Operates across battery voltage sag (e.g., 12V systems down to 9V) and nominal 24V rails |
| High-Temp Stability | Specified performance to +125°C - Maintains Bop/Brp consistency in enclosed motor enclosures |
| RoHS/Green Compliant | Lead-free, halogen-free, antimony-free - Meets automotive and industrial environmental compliance mandates |
Applications
| BLDC Motor Commutation | Rotary Encoder Feedback |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in 3-phase brushless DC motors to sequence phase energization. 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 commutation timing with no contact wear, supporting >50,000-hour motor life. |
Use Scenario: Converting mechanical rotation into digital quadrature or index pulses for position tracking. IC Role / Device Role / Timing Role: Bipolar latch generating clean, hysteresis-filtered edges per pole transition. Use Value: Delivers jitter-free pulse trains at up to 20kHz (based on 25mA sink capability and <400mV VOL). |
| RPM Monitoring System | Contactless Current Switch |
|
Use Scenario: Measuring rotational speed of fans, pumps, or conveyors via magnetic target wheel. IC Role / Device Role / Timing Role: Pulse generator whose frequency scales linearly with shaft speed. Use Value: Provides direct frequency-to-speed conversion with ±5% accuracy over –40°C to +125°C. |
Use Scenario: Detecting current-induced magnetic fields around conductors for non-invasive overload protection. IC Role / Device Role / Timing Role: Threshold-based switch activated by field strength exceeding Bop (≥30G). Use Value: Enables isolation between power and control circuits with no insertion loss or burden voltage. |
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 | Higher Bop/Brp (±50G typ), wider hysteresis (100G), same SIP-3/SOT23 packages | Better suited for high-air-gap or low-field applications; requires stronger magnets or closer placement | Select AH3782 when operating gap exceeds 2.5mm or ambient EMI is extreme |
| AL373Q | AEC-Q100 Grade 0 qualified, identical electrical specs, same SIP-3 pinout | Approved for automotive powertrain and chassis systems requiring zero-defect reliability | Choose AL373Q for production vehicles; AH373-PL-B is industrial-grade with lower qualification cost |
Compared with AH373-PL-B, AH3782 offers higher magnetic sensitivity margin but reduced compatibility with legacy magnet geometries, while AL373Q adds automotive qualification overhead without electrical benefit for non-automotive use.
Availability
AH373-PL-B is available at Aetrix Electronics and suitable for BLDC motor commutation, RPM monitoring, rotary encoder feedback, and contactless current switching requiring stable component supply across industrial temperature ranges.
Supply support for AH373-PL-B 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 and automotive markets.
The AH373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, low-cost rotor position and speed sensing in motor control systems where temperature stability and latch functionality are critical.
FAQ
What is the function of the internal pull-up resistor in AH373-PL-B?
The internal 7–13kΩ pull-up resistor connects OUT to VDD, ensuring a defined logic-high state when the output transistor is off. This eliminates the need for an external resistor, reduces PCB area, and guarantees consistent rise time and voltage level across temperature and supply variations-critical for interfacing with CMOS/TTL logic without additional components.
Can AH373-PL-B operate reliably at 125°C junction temperature?
Yes-AH373-PL-B is fully specified from –40°C to +125°C ambient, with thermal derating curves confirming 110mW power dissipation at 125°C for SIP-3. Its band-gap regulator and Hall plate design maintain stable Bop/Brp and output characteristics across this range, validated per JEDEC JESD22-A108F high-temp operating life testing.
How does the bipolar latch behavior differ from a unipolar Hall switch?
Unlike unipolar switches that activate only with one magnetic polarity, the AH373-PL-B requires opposite-polarity fields to turn on and off: South pole triggers turn-on (OUT low), North pole triggers turn-off (OUT high). This latching action retains state without continuous field presence-ideal for position memory in rotating systems where poles alternate predictably.
Is AH373-PL-B compatible with SOT23 or SC59 footprints?
No-AH373-PL-B is SIP-3 (Straight Lead) packaged, with 0.1" pin spacing and through-hole mounting. SOT23 and SC59 are surface-mount packages with different pinouts and thermal profiles. The "PL-B" suffix explicitly denotes SIP-3 Bulk packaging; SOT23 and SC59 variants use suffixes "SA-7" and "WG-7", respectively, and are not mechanically interchangeable.
AH373-PL-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- 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-PL-B FAQ
1.How can I place an order for AH373-PL-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH373-PL-B 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-PL-B reliable?
The price and inventory of AH373-PL-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH373-PL-B is usually 5 days.
3.What payment methods are accepted for AH373-PL-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH373-PL-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH373-PL-B?
AH373-PL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH373-PL-B 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-PL-B?
For technical support, including AH373-PL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH373-PL-B requirements.
6.How does Aetrix verify that AH373-PL-B is sourced from the original manufacturer or authorized distributors?
All AH373-PL-B 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-PL-B meets industry standards.
7.What is the process for return or replacement of AH373-PL-B?
All AH373-PL-B units undergo pre-shipment inspection (PSI). If there is an issue with AH373-PL-B, 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-PL-B part is unused and in its original packaging.
Return procedure for AH373-PL-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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