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Diodes Incorporated AH175-PL-B-B
- Part No.:
- AH175-PL-B-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH175-PL-B-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,346
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Product details
Overview
AH175-PL-B-B from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position sensing and RPM detection in automotive and industrial motor control systems. It operates from 3.5V to 20V, delivers 25mA output sink current, features built-in reverse-polarity protection, and supports ambient temperatures from –40°C to +150°C in SIP-3 (Bulk Pack) package.
For engineers reviewing the AH175-PL-B-B datasheet, AH175-PL-B-B pinout, AH175-PL-B-B application, or AH175-PL-B-B equivalent, this page provides verified functional context, validated pin roles, confirmed magnetic switching thresholds (Bop = 15–60 G, Brp = –60 to –15 G), thermal derating curves, and direct alternatives for legacy design continuity.
Technical Context
The AH175 integrates a Hall voltage generator, amplifier, comparator with hysteresis (30–120 G), and open-collector pre-driver stage - all powered by an internal band-gap regulator enabling stable operation across its full 3.5–20V supply range. Its latch behavior requires magnetic polarity reversal to reset output state.
Switching is defined by bipolar magnetic thresholds: output turns ON when South-pole flux exceeds Bop (15–60 G), remains latched until flux falls below Brp (–60 to –15 G). Output saturation voltage is ≤400 mV at 10 mA sink, and supply current is ≤6 mA in OFF state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 20 V - Enables direct connection to 12 V automotive rails without external regulation. |
| Operating Temperature | –40°C to +150°C - Qualified for under-hood and high-temp industrial motor environments. |
| Output Type | Open-collector pre-driver - Requires external pull-up; interfaces directly with MCU GPIO or logic-level driver inputs. |
| Sink Current | 25 mA - Sufficient to drive small relays, optocouplers, or logic-level MOSFET gates without buffering. |
| Magnetic Hysteresis | 30–120 G - Prevents chatter during slow or noisy magnetic transitions in rotating machinery. |
| Power Dissipation (SIP-3) | 550 mW at 25°C, derated to 0 mW at 150°C - Dictates PCB copper area and thermal relief requirements. |
| Reverse Polarity Protection | Built-in - Eliminates need for external series diode in battery-connected applications. |
Pinout & Package
Package: SIP-3 (Bulk Pack), 3-pin single-inline package with straight leads; body height 2.51–2.57 mm, lead pitch 2.54 mm, total length 14.0–15.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vcc | Positive power supply input | Accepts 3.5–20 V DC; powers internal regulator, Hall element, and signal chain. |
| 2 - GND | Ground reference | Common return path for supply and output current; must be low-impedance for noise immunity. |
| 3 - OUT | Open-collector digital output | Sinks up to 25 mA when active; requires external pull-up resistor to define logic HIGH level. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch functionality | Requires magnetic polarity reversal to toggle - ensures robust position detection in rotating shafts with alternating pole pairs. |
| Wide supply range (3.5–20 V) | Eliminates need for separate LDO in 12 V/24 V systems - reduces BOM count and layout complexity. |
| Integrated reverse-polarity protection | Withstands –20 V on Vcc - prevents damage during battery jump-start or wiring errors in automotive installations. |
| High-temperature operation (–40°C to +150°C) | Validated junction temperature rating enables placement near motors, inverters, or exhaust manifolds without thermal derating penalties. |
| Lead-free, halogen-free, RoHS 3 compliant | Meets EU Directive 2015/863/EU (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb) - supports global environmental compliance programs. |
Applications
| Brushless DC Motor Commutation | Automotive Fan Speed Sensing |
|---|---|
Use Scenario: Detecting rotor magnet polarity in 3-phase BLDC motors to synchronize electronic commutation timing. IC Role / Device Role / Timing Role: Digital position feedback element providing edge-triggered phase alignment signals to motor controller IC. Use Value: Enables precise 120° electrical angle sampling with 30–120 G hysteresis - suppresses false triggering from vibration-induced field fluctuations. |
Use Scenario: Monitoring fan blade rotation in engine cooling modules using embedded magnets on impeller hub. IC Role / Device Role / Timing Role: RPM pulse generator delivering clean, debounced tachometer signals to ECU via open-collector output. Use Value: Operates reliably at 150°C ambient - eliminates thermal shutdown during sustained high-load engine operation. |
| Industrial Conveyor Belt Position | Electric Power Steering (EPS) Rotor Sensing |
Use Scenario: Tracking gear tooth or magnet presence on conveyor drive shafts for speed and direction monitoring. IC Role / Device Role / Timing Role: Bipolar latch providing direction-sensitive quadrature-compatible output when paired with dual sensors. Use Value: 25 mA sink capability drives long PCB traces or twisted-pair cables directly - avoids need for line drivers in factory-floor wiring. |
Use Scenario: Sensing rotor position in brushless torque motor of EPS system for assist-angle calculation. IC Role / Device Role / Timing Role: High-reliability position sensor meeting AEC-Q100 stress test requirements (via IATF 16949 manufacturing). Use Value: Built-in reverse-voltage protection withstands load-dump transients - improves system-level fault tolerance without added TVS components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724 | Higher sensitivity (Bop = 5–35 G), lower VCC min (2.5 V), SC59/SIP-3 options, AEC-Q100 qualified | Supports low-voltage microcontrollers and tighter magnetic air gaps; preferred for new automotive designs | Select AH3724 for new designs requiring extended sensitivity, lower supply headroom, or formal AEC-Q100 qualification. |
| US1881 | Similar Bop/Brp range (15–65 G / –65 to –15 G), same SIP-3 package, but no reverse-polarity protection | Lacks integrated reverse-voltage protection - requires external series diode in battery-fed systems | Use US1881 only if board-level reverse-protection already exists and cost minimization is critical. |
Compared with AH175-PL-B-B, AH3724 offers broader design flexibility for next-gen automotive systems, while US1881 trades protection for marginal BOM cost reduction - both require revalidation of magnetic circuit and thermal layout.
Availability
AH175-PL-B-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, automotive fan speed sensing, industrial conveyor belt position monitoring, and electric power steering rotor sensing requiring stable component supply amid obsolescence transition planning.
Supply support for AH175-PL-B-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 automotive, industrial, and computing markets.
AH175 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-temperature, high-noise motor control environments where latch stability, wide supply range, and reverse-polarity resilience are mandatory.
FAQ
Is AH175-PL-B-B AEC-Q100 qualified?
No - AH175-PL-B-B is not AEC-Q100 qualified. While manufactured in IATF 16949-certified facilities and used in automotive applications, it lacks formal AEC-Q100 stress test documentation. For new automotive designs, Diodes recommends AH3724, which carries full AEC-Q100 Grade 0 qualification (–40°C to +150°C).
What is the difference between SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack)?
SIP-3 (Bulk Pack) uses straight leads optimized for through-hole wave soldering and manual assembly; SIP-3 (Ammo Pack) uses spread leads for tape-and-reel automated placement. AH175-PL-B-B specifically uses Bulk Pack configuration with 1000 units per pack and straight-lead form factor - confirmed by ordering code "-B-B" and datasheet Note 8.
Can AH175-PL-B-B drive an LED directly?
Yes - with appropriate current limiting. At VCC = 12 V and typical 300 mV saturation voltage, a 470 Ω resistor yields ~24 mA sink current, within the device's 25 mA rating. However, continuous LED drive at max current requires thermal validation due to 550 mW power dissipation limit at 25°C ambient.
Why is AH175 marked "NRND" (Not Recommended for New Designs)?
Diodes marks AH175 as NRND because AH3724 supersedes it with improved sensitivity, lower minimum supply voltage (2.5 V), AEC-Q100 qualification, and enhanced ESD performance. AH175 remains fully supported for existing production and legacy repair, but new designs should adopt AH3724 unless backward compatibility or specific magnetic threshold behavior is required.
AH175-PL-B-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:
- 8mT Trip, -8mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3.5V ~ 20V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Collector
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH175-PL-B-B FAQ
1.How can I place an order for AH175-PL-B-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH175-PL-B-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 AH175-PL-B-B reliable?
The price and inventory of AH175-PL-B-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH175-PL-B-B is usually 5 days.
3.What payment methods are accepted for AH175-PL-B-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH175-PL-B-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH175-PL-B-B?
AH175-PL-B-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH175-PL-B-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 AH175-PL-B-B?
For technical support, including AH175-PL-B-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH175-PL-B-B requirements.
6.How does Aetrix verify that AH175-PL-B-B is sourced from the original manufacturer or authorized distributors?
All AH175-PL-B-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 AH175-PL-B-B meets industry standards.
7.What is the process for return or replacement of AH175-PL-B-B?
All AH175-PL-B-B units undergo pre-shipment inspection (PSI). If there is an issue with AH175-PL-B-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 AH175-PL-B-B part is unused and in its original packaging.
Return procedure for AH175-PL-B-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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