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Diodes Incorporated ATS137-PG-A-B
- Part No.:
- ATS137-PG-A-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
ATS137-PG-A-B.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
ATS137-PG-A-B from Diodes Incorporated is a single-pole, unipolar Hall-effect switch IC with open-collector output, operating from 3.5V to 20V, rated for −20°C to +85°C, delivering up to 25mA sink current, and featuring reverse polarity protection and temperature compensation. It is used in contactless position sensing for cover detection in home appliances and optical drive loaders.
For engineers reviewing the ATS137-PG-A-B datasheet, ATS137-PG-A-B pinout, ATS137-PG-A-B application, or ATS137-PG-A-B equivalent, key selection considerations include magnetic operate/release points (100 G max BOP, 10 G min BRP), SIP-3L package thermal limits (550 mW at 25°C), and open-collector interface compatibility with pull-up resistors and microcontroller inputs.
Technical Context
The ATS137 integrates a Hall voltage generator, amplifier, Schmitt trigger with 80 G hysteresis, and bandgap-regulated open-collector pre-driver - enabling robust noise-immune switching across its full 3.5–20 V supply range. Its internal regulator decouples output performance from supply variation.
Magnetic sensing is unidirectional (south-pole activation only), with operation defined by BOP ≤ 100 G and BRP ≥ 10 G (A-grade), ensuring reliable turn-on/turn-off margins in mechanical gap variations typical of door/lid detection systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 20 V - supports direct connection to 5 V, 12 V, or 19 V rails without external regulation. |
| Output Type | Open-collector - requires external pull-up; enables wired-OR logic and level translation to MCU I/O. |
| Sink Current | 25 mA max - drives LEDs, small relays, or logic gates directly without buffer stages. |
| Operating Temp | −20°C to +85°C - qualified for consumer and industrial indoor environments including kitchen appliances and office equipment. |
| Magnetic Hysteresis | 80 G typical - prevents chatter during slow or noisy magnetic transitions in cover-detection applications. |
| Reverse Polarity Protection | −20 V on VCC - safeguards against accidental battery or supply reversal during assembly or field service. |
| Power Dissipation | 550 mW (SIP-3L @ 25°C) - defines maximum continuous load under ambient thermal conditions before derating applies. |
Pinout & Package
SIP-3L (Single In-line Package, 3-lead) with gull-wing leads, lead-free and RoHS-compliant, commonly used in cost-sensitive consumer electronics where board space and assembly simplicity are prioritized over thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Accepts 3.5–20 V DC; internally regulates bias for Hall plate and amplifier. |
| GND (Pin 2) | Ground reference | Common return for supply and output sink path; must be low-impedance for stable switching. |
| DO (Pin 3) | Digital output (open-collector) | Sinks up to 25 mA when active; floats high when inactive - requires external pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Temperature Compensation | Stabilizes BOP/BRP thresholds across −20°C to +85°C, reducing calibration drift in varying ambient conditions. |
| Wide Supply Range | 3.5–20 V operation eliminates need for dedicated LDOs in multi-rail systems like DVD/CD loaders with 5 V logic and 12 V motor supplies. |
| Reverse Polarity Protection | Withstands −20 V on VCC, preventing latch-up or damage during incorrect power connection in high-volume appliance manufacturing. |
| Lead-Free & Green Molding | SIP-3L package uses bromine/antimony-free epoxy and matte-tin lead finish - compliant with EU RoHS Directive 2002/95/EC. |
Applications
| Optical Drive Tray Detection | Cover/Open Detection |
|---|---|
|
Use Scenario: Detecting tray insertion/ejection in CD/DVD-ROM drives and VCD loaders. IC Role / Device Role / Timing Role: Contactless position sensor converting mechanical motion into digital enable/disable signal for drive controller. Use Value: Eliminates wear-prone microswitches; enables faster, quieter, and more reliable tray status reporting than mechanical alternatives. |
Use Scenario: Sensing lid or door closure in microwave ovens, refrigerators, and clamshell phones. IC Role / Device Role / Timing Role: Magnetic proximity detector providing ON/OFF state to safety interlock or system wake-up circuitry. Use Value: Provides fail-safe, bounce-free switching with 80 G hysteresis - critical for preventing unintended operation during partial closure. |
| Home Safety Monitoring | Speed Measurement (Low-Frequency) |
|
Use Scenario: Replacing reed switches in window/door alarm sensors for residential security systems. IC Role / Device Role / Timing Role: Solid-state magnetic switch interfacing with low-power microcontroller GPIO pins. Use Value: Offers >10× longer lifetime and immunity to vibration-induced false triggers compared to electromechanical reed relays. |
Use Scenario: Counting rotations of low-speed fans or rollers using magnet-attached shafts. IC Role / Device Role / Timing Role: Digital edge generator synchronized to magnetic pole passage for RPM calculation. Use Value: Supports rise/fall times ≤1.5 µs at 14 V - sufficient for <1 kHz rotation rates with clean timing edges. |
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 | Operates at 2.5–3.5 V only; BOP = 30 G typical; SC59-3L package; no reverse polarity protection. | Targeted for battery-powered portable devices, not 12–20 V mains-powered appliances. | Select only if supply is ≤3.5 V and reverse protection is handled externally. |
| Melexis US1881EUA-ABA-000-REEL | Bipolar operation (N/S pole sensitive); BOP = ±35 G; 3.5–24 V supply; built-in zener clamp but no reverse polarity rating. | Suitable for bidirectional sensing (e.g., rotary encoder direction), not unipolar cover detection. | Choose only when dual-pole response or higher voltage margin (24 V) is required; verify external reverse protection. |
Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, ATS137-PG-A-B uniquely combines 20 V absolute max rating, −20 V reverse tolerance, and SIP-3L thermal capability (550 mW), making it optimal for cost-sensitive, mains-powered consumer enclosures where reliability under supply fault conditions is mandatory.
Availability
ATS137-PG-A-B is available at Aetrix Electronics and suitable for optical drive loaders, home appliance cover detectors, and residential safety sensors requiring stable component supply across multi-year production cycles.
Supply support for ATS137-PG-A-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, serving automotive, industrial, computing, and consumer markets with high-reliability, cost-optimized components.
The ATS137 belongs to Diodes' Hall-effect sensor product line, designed specifically for robust, low-cost contactless switching in white goods, optical storage, and home automation - emphasizing manufacturability, thermal resilience, and supply chain longevity.
FAQ
What is the magnetic polarity requirement for ATS137-PG-A-B operation?
The ATS137-PG-A-B responds only to the south pole applied to the branded side of the package. Its unipolar design requires magnetic flux density exceeding 100 G (max BOP) for turn-on and dropping below 10 G (min BRP) for turn-off. North-pole exposure produces no switching action, ensuring predictable behavior in asymmetric magnetic layouts.
Can ATS137-PG-A-B drive an LED directly without a series resistor?
No. While the device sinks up to 25 mA, a current-limiting resistor is mandatory between VCC and the LED anode to prevent excessive forward current. For a 5 V supply and standard red LED (VF ≈ 1.8 V), a minimum 120 Ω resistor ensures ≤25 mA sink - calculated as (5 V − 1.8 V) / 25 mA = 128 Ω.
Is the SIP-3L package of ATS137-PG-A-B compatible with standard SOT-23 footprints?
No. SIP-3L has a 2.00 mm lead pitch and gull-wing leads with 1.15 mm body width, whereas SOT-23 measures 2.90–3.10 mm wide with 1.90 mm lead spacing. The SC59-3L variant (e.g., ATS137-WG-7-A) matches SOT-23 dimensions and is the correct choice for legacy SOT-23 layouts.
Does ATS137-PG-A-B require an external capacitor on the VCC pin?
A 0.1 µF ceramic bypass capacitor is recommended between VCC and GND, placed within 5 mm of the SIP-3L package. This stabilizes the internal bandgap regulator during fast magnetic transients and suppresses supply noise that could cause false triggering - especially critical in electrically noisy environments like motor-driven DVD trays.
ATS137-PG-A-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 13mT 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-PG-A-B FAQ
1.How can I place an order for ATS137-PG-A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for ATS137-PG-A-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 ATS137-PG-A-B reliable?
The price and inventory of ATS137-PG-A-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATS137-PG-A-B is usually 5 days.
3.What payment methods are accepted for ATS137-PG-A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATS137-PG-A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATS137-PG-A-B?
ATS137-PG-A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATS137-PG-A-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 ATS137-PG-A-B?
For technical support, including ATS137-PG-A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATS137-PG-A-B requirements.
6.How does Aetrix verify that ATS137-PG-A-B is sourced from the original manufacturer or authorized distributors?
All ATS137-PG-A-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 ATS137-PG-A-B meets industry standards.
7.What is the process for return or replacement of ATS137-PG-A-B?
All ATS137-PG-A-B units undergo pre-shipment inspection (PSI). If there is an issue with ATS137-PG-A-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 ATS137-PG-A-B part is unused and in its original packaging.
Return procedure for ATS137-PG-A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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