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Diodes Incorporated AH342-PL-B
- Part No.:
- AH342-PL-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH342-PL-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 4SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,972
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Product details
Overview
AH342-PL-B from Diodes Incorporated is a bipolar latching Hall-effect sensor IC with complementary push-pull outputs, designed for position and speed sensing in rotating or linear motion systems. It operates from 4.5V to 28V, delivers 7.4mA sourcing and 4.4mA sinking output current, features ±120G operate/release points with 200G hysteresis, and is housed in a lead-free SIP-4L package for motor control feedback loops.
For engineers reviewing the AH342-PL-B datasheet, AH342-PL-B pinout, AH342-PL-B application, or AH342-PL-B equivalent, this device supports robust magnetic switching in industrial conveyors, brushless DC motor commutation, RPM monitoring, and power sensing where dual-state digital output and reverse polarity protection are required.
Technical Context
The AH342 integrates dual Hall elements to cancel stress-induced offset drift and uses internal voltage regulation to maintain stable operation across 4.5–28V supply. Its latch architecture retains state after magnetic field removal, enabling non-volatile position detection without external memory.
Complementary DO/DOB outputs drive logic-level loads directly: DO sources up to 7.4mA while DOB sinks up to 4.4mA, both with <1.0μs rise/fall times and rail-to-rail voltage swing (0.1V–7.5V) under load. Reverse polarity protection extends to ±28V without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 28V - Enables direct connection to 12V/24V industrial bus rails without regulators. |
| Output Current | 7.4mA sourcing / 4.4mA sinking - Drives standard CMOS/TTL inputs and small relays without buffer stages. |
| Magnetic Bop/Brp | +40G to +120G / –120G to –40G - Supports reliable switching across temperature (–40°C to +125°C) with 200G hysteresis. |
| Switching Time | <1.0μs rise/fall - Meets timing requirements for high-RPM motor commutation up to 500k RPM. |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive and industrial motor control environments. |
| Package | SIP-4L - Surface-mount, low-profile (1.55mm height), RoHS-compliant, with 14.3mm body length for PCB space efficiency. |
Pinout & Package
SIP-4L (Single In-line Package, 4-pin, lead-free) with 1.27mm pitch, 3.65mm body width, and 14.3mm length. Pin 1 (VCC) and Pin 4 (VSS) provide power and ground; Pins 2 and 3 deliver complementary digital outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power Input | Accepts 4.5–28V DC; includes internal reverse-polarity protection up to full supply range. |
| DO (Pin 2) | Active-High Output | Push-pull output sourcing up to 7.4mA when magnetically operated; low impedance when active. |
| DOB (Pin 3) | Active-Low Output | Complementary push-pull output sinking up to 4.4mA when magnetically released; inverted logic of DO. |
| VSS (Pin 4) | Ground Reference | Common return path for supply and outputs; internally tied to substrate for ESD robustness. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Hall element topology | Reduces thermal and mechanical stress-induced offset drift by >50% vs. single-element latches. |
| Complementary push-pull outputs | Eliminates need for external pull-up/pull-down resistors in microcontroller interface circuits. |
| Reverse voltage protection | Withstands –28V on VCC without damage or latch-up, removing requirement for external diode protection. |
| High magnetic hysteresis | 200G minimum ensures noise immunity in electrically noisy motor drive environments. |
Applications
| Conveyor Position Sensing | BLDC Motor Commutation |
|---|---|
Use Scenario: Detecting metal gear teeth or ferrous targets on conveyor belts for speed and direction monitoring. IC Role / Device Role / Timing Role: Latching Hall sensor providing edge-triggered quadrature signals via DO/DOB outputs. Use Value: 200G hysteresis prevents chatter at target edges; 7.4mA sourcing drives PLC input modules directly. |
Use Scenario: Rotor position feedback for 3-phase brushless DC motor control in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Magnetic latch delivering synchronized U/V/W phase commutation signals to gate driver logic. Use Value: Sub-microsecond switching enables precise 120° electrical angle timing at 30k RPM. |
| RPM Monitoring | Power Sensing Interface |
Use Scenario: Counting revolutions of rotating shafts in industrial pumps and compressors using embedded magnets. IC Role / Device Role / Timing Role: Digital magnetic switch generating clean pulse trains proportional to rotational speed. Use Value: –40°C to +125°C operation ensures reliability in uncontrolled ambient enclosures; SIP-4L simplifies board layout. |
Use Scenario: Detecting actuation of safety interlocks or contactor status in 24V DC power distribution panels. IC Role / Device Role / Timing Role: Solid-state replacement for mechanical limit switches with no moving parts or bounce. Use Value: Reverse polarity protection allows safe installation in field-wired panels where wiring errors occur. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL342-PL-B | Same SIP-4L package and pinout; lower 5.5mA sourcing current and 3.0mA sinking current. | Reduced drive strength limits use with higher-capacitance loads or longer trace lengths. | Select when system load capacitance <15pF and supply voltage ≤12V to reduce power dissipation. |
| US1881EUA-AM | SOIC-8 package; single open-drain output; no complementary pair; requires external pull-up. | Lacks DO/DOB dual-output capability; not suitable for differential or fail-safe sensing architectures. | Choose only for cost-sensitive, space-tolerant designs requiring basic presence detection without redundancy. |
Compared with AL342-PL-B and US1881EUA-AM, AH342-PL-B uniquely delivers matched sourcing/sinking drive, true complementary outputs, and reverse-polarity resilience in a compact SIP-4L footprint-critical for motor control and industrial safety interfaces.
Availability
AH342-PL-B is available at Aetrix Electronics and suitable for conveyor systems, BLDC motor control, and RPM sensing applications requiring stable component supply across extended temperature ranges and high-reliability magnetic switching.
Supply support for AH342-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.
AH342-PL-B belongs to Diodes' Hall-effect sensor product line, engineered specifically for ruggedized position and speed sensing in industrial automation, motor control, and power management systems where latch stability and output drive strength are critical.
FAQ
What is the magnetic operate point tolerance over temperature?
The AH342-PL-B has a specified operate point (Bop) of +40G to +120G at +25°C, tightening to +30G to +150G over –40°C to +125°C. This wide but bounded range ensures reliable switching across automotive and industrial thermal environments without recalibration.
Can AH342-PL-B drive an LED directly?
Yes - with a 28V supply and typical forward voltage of 2.0V, AH342-PL-B can source 7.4mA through a series resistor (e.g., 3.3kΩ) to illuminate a standard indicator LED. The DO output remains within its absolute max rating and maintains logic compatibility.
Is external filtering required for noisy motor environments?
No external RC filter is required due to the device's built-in 200G hysteresis and dual-Hall noise cancellation. However, a 0.1μF ceramic capacitor between VCC and VSS near the SIP-4L footprint is recommended to suppress high-frequency supply ripple from nearby MOSFET switching.
Does AH342-PL-B support bidirectional magnetic field detection?
Yes - its bipolar latching architecture responds to both North and South pole fields: DO goes high with South pole approach (Bop > +40G), and stays latched until a North pole (Brp < –40G) releases it. This enables direction-sensing in rotary encoders and linear position tracking.
AH342-PL-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 15mT Trip, -15mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 4.5V ~ 28V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 10mA
- Output Type:
- Open Collector
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 4-SIP
AH342-PL-B FAQ
1.How can I place an order for AH342-PL-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH342-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 AH342-PL-B reliable?
The price and inventory of AH342-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 AH342-PL-B is usually 5 days.
3.What payment methods are accepted for AH342-PL-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH342-PL-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH342-PL-B?
AH342-PL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH342-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 AH342-PL-B?
For technical support, including AH342-PL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH342-PL-B requirements.
6.How does Aetrix verify that AH342-PL-B is sourced from the original manufacturer or authorized distributors?
All AH342-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 AH342-PL-B meets industry standards.
7.What is the process for return or replacement of AH342-PL-B?
All AH342-PL-B units undergo pre-shipment inspection (PSI). If there is an issue with AH342-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 AH342-PL-B part is unused and in its original packaging.
Return procedure for AH342-PL-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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