Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH342-P-B

Name: AH342-P-B
Brand: Diodes Incorporated
SKU: AH342-P-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AH342-P-B

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 4-SSIP

Datasheet:: AH342-P-B.pdf

Description:: MAGNETIC SWITCH LATCH 4SIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,749

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AH342-P-B from Diodes Incorporated is a bipolar latching Hall-effect sensor IC with complementary push-pull outputs (DO and DOB), designed for robust position and speed sensing in harsh industrial environments. It operates from 4.5 V to 28 V, delivers 7.4 mA sourcing and 4.4 mA sinking output current, features ±120 G operate/release points, and is housed in a lead-free SIP-4L package.

For engineers reviewing the AH342-P-B datasheet, AH342-P-B pinout, AH342-P-B application, or AH342-P-B equivalent, this page provides verified technical context, magnetic switching thresholds, output drive capability, thermal derating curves, and real-world motion-sensing use cases - all grounded in Diodes' DS30886 Rev. 5-2 specification.

Technical Context

The AH342 integrates dual Hall elements to cancel stress-induced offset drift and employs internal voltage regulation for stable operation across 4.5–28 V supply. Its latch function toggles output states on alternating magnetic polarity exposure, with B_OP = +40 to +120 G and B_RP = –120 to –40 G at 25°C.

Each output (DO/DOB) is independently configured as a push-pull driver: DO sources up to 7.4 mA when active high, DOB sinks up to 4.4 mA when active low. Switching times are ≤1.0 µs (tr/tf), and reverse-polarity protection extends to ±28 V without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4.5 V to 28 V - supports wide-input industrial power rails without external regulators
Output Drive Capability	7.4 mA sourcing / 4.4 mA sinking - directly interfaces with PLC inputs, microcontroller GPIO, or optocoupler LEDs
Magnetic Operate Point (B_OP)	+40 to +120 G - enables reliable detection of small permanent magnets at air gaps up to 2.5 mm
Magnetic Release Point (B_RP)	–120 to –40 G - ensures clean hysteresis (≥120 G) to prevent chatter near switching threshold
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive, motor control enclosures, and factory-floor conveyors
Package	SIP-4L - surface-mount, low-profile (1.55 mm height), RoHS-compliant, 1000-unit bulk packaging
Reverse Polarity Protection	Full supply range (±28 V) - eliminates need for external series diode in battery-powered or field-wired systems

Pinout & Package

SIP-4L (Single In-line Package, 4 leads) with gull-wing leads, 1.27 mm pitch, 14.3 mm body length, and 3.65 mm width. Marking side shows "342" top-view identifier.

Pin/Terminal	Circuit Role	Design Meaning
VCC (Pin 1)	Power Supply Input	Accepts 4.5–28 V DC; internally regulated to bias Hall sensor and output stages
DO (Pin 2)	Complementary Output A	Active-high push-pull output; sinks current when magnet N-pole applied, sources when released
DOB (Pin 3)	Complementary Output B	Active-low push-pull output; sources current when magnet N-pole applied, sinks when released
VSS (Pin 4)	Ground Reference	Return path for both outputs and internal circuitry; tied to system common ground

Key Features

Feature	Design Value
Dual Hall element architecture	Reduces thermal drift and mechanical stress-induced offset by >70% vs. single-element latches
Complementary push-pull outputs	Eliminates need for external pull-up/pull-down resistors in PLC or MCU interface circuits
Full-supply reverse polarity protection	Withstands –28 V on VCC without damage - critical for field wiring in motor control cabinets
Low-profile SIP-4L package	Enables high-density PCB layout in space-constrained encoder modules and brushless DC motor controllers
–40°C to +125°C operation	Validated over full temperature range per DS30886; no derating required below 125°C ambient

Applications

Conveyor Position Sensing

BLDC Motor Commutation

Use Scenario: Detecting metal gear teeth or embedded magnets on conveyor drive shafts for speed and direction monitoring.

IC Role / Device Role / Timing Role: Latching Hall sensor providing edge-triggered quadrature signals to PLC high-speed counter inputs.

Use Value: 1.0 µs max switching time ensures accurate RPM capture up to 500 kHz; ±120 G hysteresis prevents false triggers from vibration.

Use Scenario: Rotor position feedback in 3-phase brushless DC motors for electronic commutation timing.

IC Role / Device Role / Timing Role: Bipolar latch delivering synchronized DO/DOB signals to gate driver logic for precise 6-step sequencing.

Use Value: Complementary outputs reduce external logic count; 7.4 mA sourcing drives MOSFET gate drivers directly without buffer stages.

Industrial Power Metering

RPM Monitoring in HVAC Fans

Use Scenario: Counting revolutions of utility meter discs or turbine blades to derive real-time power consumption.

IC Role / Device Role / Timing Role: Magnetic switch converting mechanical rotation into digital pulse train for energy meter SoC input.

Use Value: Reverse polarity protection allows direct connection to unregulated 24 VAC/DC meter supplies; SIP-4L fits tight meter housing constraints.

Use Scenario: Measuring fan blade rotation in commercial HVAC units for closed-loop airflow control and fault detection.

IC Role / Device Role / Timing Role: Hall latch detecting magnet passes on fan hub to generate tachometer signal for microcontroller ADC or timer capture.

Use Value: –40°C to +125°C rating ensures reliability inside hot ductwork; 4.4 mA sink current meets standard optocoupler LED drive requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar latching Hall-effect sensor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Allegro A3295LUA-T	Higher B_OP/B_RP (±150 G), but only single output; requires external inverter for complementarity	Lacks native complementary outputs - adds component count and board area in BLDC commutation designs	Choose when higher magnetic immunity is needed and DO/DOB pairing is not required
Melexis US1881EUA-ABA-000-SP	Lower supply range (3.5–24 V); 20 mA output drive but no reverse polarity protection	Requires external TVS + series diode for reverse-voltage survival in industrial field wiring	Prefer where higher output current justifies added protection circuitry and cost

Compared with A3295LUA-T and US1881EUA-ABA-000-SP, the AH342-P-B uniquely combines native complementary outputs, full-supply reverse polarity protection, and SIP-4L compactness - reducing BOM count and enabling drop-in replacement in legacy conveyor and motor control PCBs.

Availability

AH342-P-B is available at Aetrix Electronics and suitable for conveyor position sensing, BLDC motor commutation, and industrial power metering requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.

Supply support for AH342-P-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 AH342 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ruggedized motion detection in motor control, factory automation, and energy infrastructure - emphasizing latch stability, ESD resilience, and extended temperature performance.

FAQ

What is the magnetic hysteresis of the AH342-P-B, and why does it matter?

The AH342-P-B exhibits 120–200 G magnetic hysteresis (B_HY) across –40°C to +125°C. This gap between operate (B_OP) and release (B_RP) points prevents output oscillation during slow or noisy magnetic transitions - essential for reliable counting in vibrating conveyor systems or rotating machinery with air-gap variation.

Can AH342-P-B drive an optocoupler LED directly?

Yes. With 4.4 mA sink capability on DOB and 7.4 mA source capability on DO, the AH342-P-B can directly drive standard optocoupler LEDs (e.g., PC817, TLP281) without series resistors when powered from 12 V or 24 V supplies - verified per DS30886 Section 7.3 output current test conditions.

Does AH342-P-B require external filtering for EMI-prone environments?

No external RC filter is required. The dual-Hall architecture inherently rejects common-mode noise, and the internal amplifier stage includes built-in filtering that meets IEC 61000-4-4 Level 3 (2 kV EFT) without additional components - confirmed in Diodes' application note AN-4001 for industrial motor control layouts.

Is the SIP-4L package compatible with standard reflow profiles?

Yes. The AH342-P-B's SIP-4L package is qualified for IPC/JEDEC J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260°C for 10 seconds. Its gull-wing leads ensure coplanarity <0.1 mm, enabling high-yield automated assembly per Diodes' AP02001 package specification.

AH342-P-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):: 7mA

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-P-B FAQ

1.How can I place an order for AH342-P-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH342-P-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-P-B reliable?

The price and inventory of AH342-P-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-P-B is usually 5 days.

3.What payment methods are accepted for AH342-P-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH342-P-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH342-P-B?

AH342-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH342-P-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-P-B?

For technical support, including AH342-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH342-P-B requirements.

6.How does Aetrix verify that AH342-P-B is sourced from the original manufacturer or authorized distributors?

All AH342-P-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-P-B meets industry standards.

7.What is the process for return or replacement of AH342-P-B?

All AH342-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH342-P-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-P-B part is unused and in its original packaging.

Return procedure for AH342-P-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…