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

Diodes Incorporated ATS137-PL-B-A

Name: ATS137-PL-B-A
Brand: Diodes Incorporated
SKU: ATS137-PL-B-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATS137-PL-B-A

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: ATS137-PL-B-A.pdf

Description:: MAGNETIC SWITCH UNIPOLAR 3SIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,996

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Product details

Overview

ATS137-PL-B-A from Diodes Incorporated is a single-pole, unipolar Hall-effect switch IC in SIP-3L package, designed for contactless position and proximity sensing. It operates from 3.5V to 20V DC, delivers 25mA maximum sinking output current, features reverse polarity protection, temperature compensation, and open-collector output-used in cover detection for home appliances and safety interlocks.

For engineers reviewing the ATS137-PL-B-A datasheet, ATS137-PL-B-A pinout, ATS137-PL-B-A application, or ATS137-PL-B-A equivalent, key selection criteria include magnetic operate/release points (B_op ≤ 130 G, B_rp ≥ 10 G), hysteresis (80 G typ), wide supply range, and SIP-3L thermal performance (550 mW at 25°C).

Technical Context

The ATS137 integrates a Hall voltage generator, low-noise amplifier, Schmitt trigger with built-in hysteresis, and open-collector pre-driver stage-all powered by an internal bandgap regulator. This architecture enables robust noise immunity and stable switching across its full operating temperature range (–20°C to +85°C) and supply voltage (3.5V–20V).

Its unipolar magnetic response activates on south-pole approach to the branded side only, with B-grade magnetic characteristics (B_op ≤ 130 G, B_rp ≥ 10 G, B_hy = 80 G typ). The device lacks latch functionality and requires field removal to reset-making it suitable for momentary detection rather than toggle applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.5V to 20V DC - supports direct connection to 5V, 12V, or 19V rails without external regulation.
Output Type	Open-collector - requires external pull-up; enables wired-OR logic and level translation up to 30V.
Sink Current	25mA max - drives LEDs, small relays, or microcontroller inputs directly without buffering.
Magnetic Sensitivity	B_op ≤ 130 G, B_rp ≥ 10 G - ensures reliable actuation with common ferrite magnets at air gaps up to 3 mm.
Operating Temp	–20°C to +85°C - qualified for consumer and industrial indoor environments (e.g., appliance housings, HVAC panels).
Power Dissipation	550 mW (SIP-3L @ 25°C) - enables continuous operation at full load without heatsinking in ambient < 60°C.
Reverse Polarity Protection	Withstands –20V on V_CC - prevents damage during battery misconnection or board-level ESD events.

Pinout & Package

SIP-3L (Single In-line Package, 3-lead) with gull-wing leads; 2.00 mm × 1.15 mm body, 0.51 mm nominal thickness; branded surface indicates active Hall element location.

Pin/Terminal	Circuit Role	Design Meaning
V_CC (Pin 1)	Positive Supply Input	Accepts 3.5–20V DC; internally regulated to power analog front-end and digital logic.
GND (Pin 2)	Ground Reference	Common return for Hall sensor, amplifier, and output driver; must be low-impedance.
DO (Pin 3)	Digital Output (Open-Collector)	Sinks up to 25mA when activated; floats high when inactive-requires external pull-up resistor.

Key Features

Feature	Design Value
Temperature Compensation	Stabilizes B_op/B_rp over –20°C to +85°C-reduces calibration drift in thermally varying enclosures.
Wide Supply Range	3.5V–20V operation eliminates need for dedicated LDO in multi-rail systems (e.g., 12V appliance main + 5V MCU rail).
Reverse Polarity Protection	Withstands –20V on V_CC-protects against field-service wiring errors without external diode.
Hysteresis	80 G typical-prevents chatter near magnetic threshold; enables clean edge generation for microcontroller GPIO interrupts.
Lead-Free & RoHS	SIP-3L package uses green molding compound (Br/Sb-free) and lead-free finish-complies with EU Directive 2002/95/EC.

Applications

Refrigerator Door Detection

CD/DVD Tray Position Sensing

Use Scenario: Detect door open/closed state in residential refrigerators to disable interior lighting and control compressor cycling.

IC Role / Device Role / Timing Role: Unipolar Hall switch providing momentary logic-low signal when magnet on door approaches branded face.

Use Value: Replaces mechanical limit switches-eliminates wear-out failure mode and supports >10M cycle lifetime.

Use Scenario: Confirm tray insertion/ejection status in optical disc drives to enable laser activation and motor control.

IC Role / Device Role / Timing Role: Contactless position sensor interfacing directly with drive controller GPIO via open-collector output.

Use Value: Enables sub-millisecond response vs. reed relay (≥10 ms), improving user feedback latency and system responsiveness.

Microwave Oven Safety Interlock

Smart Home Window Sensor

Use Scenario: Verify oven cavity door closure before enabling magnetron power-critical safety function in Class I appliances.

IC Role / Device Role / Timing Role: Fail-safe proximity detector with reverse polarity protection and thermal stability across kitchen ambient conditions.

Use Value: Meets IEC 60335-1 requirements for redundant sensing; no moving parts reduces field failure rate by >95% vs. microswitches.

Use Scenario: Monitor window opening in connected security systems using battery-powered wireless nodes.

IC Role / Device Role / Timing Role: Low-quiescent-current (5–10 mA typ) Hall switch triggering ultra-low-power MCU wake-up on magnetic transition.

Use Value: Extends coin-cell battery life to >2 years by minimizing active time-enabled by fast rise/fall times (≤1.5 µs).

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Allegro A3212LLHLT-T	Bipolar latching operation (B_op/B_rp ±30 G); higher sensitivity but requires alternating poles for toggle behavior.	Requires magnet polarity reversal per actuation-unsuitable for simple cover-open detection where only one pole is present.	Select only if system design incorporates dual-pole magnets and needs non-volatile state retention between cycles.
Melexis US1881EUA-ABA-000-SP	Unipolar, same SIP-3L footprint; B_op = 30 G (lower sensitivity), wider temp range (–40°C to +150°C), higher ICC (8 mA typ).	Better for automotive under-hood use; lower B_op allows larger air gaps but increases susceptibility to stray fields.	Prefer for extended temperature or high-reliability industrial settings; avoid where space-constrained magnets yield weak flux density.

Compared with A3212LLHLT-T and US1881EUA-ABA-000-SP, ATS137-PL-B-A offers optimal balance of sensitivity (130 G B_op), thermal stability, and cost for consumer white goods-without requiring latching behavior or extreme temperature rating.

Availability

ATS137-PL-B-A is available at Aetrix Electronics and suitable for refrigerator door detection, CD/DVD tray sensing, and microwave oven safety interlocks requiring stable component supply, long-life contactless operation, and SIP-3L manufacturability.

Supply support for ATS137-PL-B-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 integrated circuits, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets since 1959.

ATS137 belongs to Diodes' Hall-effect sensor product line, engineered specifically for cost-sensitive, high-volume contactless switching in home appliances and safety-critical electromechanical interfaces.

FAQ

What is the magnetic polarity requirement for ATS137-PL-B-A operation?

The ATS137-PL-B-A responds only to the south pole applied to its branded surface. It does not activate with north-pole approach or when the magnet is reversed. This unipolar behavior ensures predictable, single-direction actuation in cover-detection applications where magnet orientation is fixed during assembly.

Can ATS137-PL-B-A drive a 12V relay coil directly?

No-it cannot drive a 12V relay coil directly because its output is open-collector with 25mA sink capability and 30V V_CE(off) rating. A 12V relay coil typically draws >30mA and requires sourcing current. Use a PNP transistor or N-channel MOSFET buffer stage with appropriate base/gate resistor to interface safely.

Is ATS137-PL-B-A qualified for automotive applications?

No-ATS137-PL-B-A is rated for –20°C to +85°C ambient and is not AEC-Q200 qualified. For automotive cabin or under-hood use, Diodes recommends the AH3767Q or AH3772Q series, which offer –40°C to +150°C operation and automotive-grade qualification.

How does temperature affect the magnetic operate point of ATS137-PL-B-A?

ATS137-PL-B-A includes on-chip temperature compensation that stabilizes B_op and B_rp across –20°C to +85°C. Typical variation is <±10% over full range-enabling consistent trip points in environments like kitchen appliances where ambient may shift from 15°C to 45°C during operation.

ATS137-PL-B-A Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

Product Status:: Obsolete

Function:: Unipolar Switch

Technology:: Hall Effect

Polarization:: South Pole

Sensing Range:: 10mT Trip, 1mT Release

Test Condition:: 25°C

Voltage - Supply:: 3.5V ~ 20V

Current - Supply (Max):: 10mA

Current - Output (Max):: 25mA

Output Type:: Open Collector

Features:: Temperature Compensated

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-SIP

ATS137-PL-B-A FAQ

1.How can I place an order for ATS137-PL-B-A through Aetrix?

Please submit a Request for Quotation (RFQ) for ATS137-PL-B-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 ATS137-PL-B-A reliable?

The price and inventory of ATS137-PL-B-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATS137-PL-B-A is usually 5 days.

3.What payment methods are accepted for ATS137-PL-B-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATS137-PL-B-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATS137-PL-B-A?

ATS137-PL-B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATS137-PL-B-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 ATS137-PL-B-A?

For technical support, including ATS137-PL-B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATS137-PL-B-A requirements.

6.How does Aetrix verify that ATS137-PL-B-A is sourced from the original manufacturer or authorized distributors?

All ATS137-PL-B-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 ATS137-PL-B-A meets industry standards.

7.What is the process for return or replacement of ATS137-PL-B-A?

All ATS137-PL-B-A units undergo pre-shipment inspection (PSI). If there is an issue with ATS137-PL-B-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 ATS137-PL-B-A part is unused and in its original packaging.

Return procedure for ATS137-PL-B-A:

1.Submit a request within 90 days.

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

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