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Diodes Incorporated AH173-PG-A-B
- Part No.:
- AH173-PG-A-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH173-PG-A-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,412
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Product details
Overview
AH173-PG-A-B from Diodes Incorporated is a bipolar Hall effect latch sensor with integrated pullup resistor, designed for high-temperature rotor position sensing and RPM detection in 3-phase BLDC motor control. It operates from 3V to 20V, delivers 25mA sink current, features ±15–60 Gauss magnetic operate/release points (A-grade), and functions reliably from −40°C to +125°C in SIP-3 package.
For engineers reviewing the AH173-PG-A-B datasheet, AH173-PG-A-B pinout, AH173-PG-A-B application, or AH173-PG-A-B equivalent, this page provides verified magnetic thresholds, thermal derating curves, package-specific power dissipation limits, and validated alternatives for legacy motor-sensing designs.
Technical Context
The AH173 integrates a Hall voltage generator, amplifier, comparator with hysteresis (80 Gauss typical), and open-collector output stage with internal 7–13 kΩ pullup resistor. Its bandgap-regulated internal supply enables stable operation across the full 3–20 VCC range and temperature span.
Magnetic switching is bipolar: output pulls low when south-pole flux exceeds Bop (15–60 G), remains latched until reverse flux falls below Brp (−60 to −15 G). Output saturation voltage is ≤400 mV at 10 mA sink, with supply current <6 mA in off-state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 20 V DC - supports direct connection to automotive battery rails without external regulation |
| Output Sink Current | 25 mA - drives standard logic inputs or small relays without external buffer |
| Operating Temperature | −40°C to +125°C - qualified for under-hood motor control and industrial enclosures |
| Magnetic Hysteresis | 80 Gauss typical - prevents chatter near switching threshold in noisy EMI environments |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup, reducing BOM count and PCB area |
| Output Saturation Voltage | ≤400 mV at 10 mA - ensures clean TTL/CMOS-compatible low-level signaling |
| Supply Current (Off) | ≤6 mA at 12 V - enables low-power standby modes in battery-operated systems |
Pinout & Package
AH173-PG-A-B is supplied in SIP-3 (Straight Lead, Bulk Pack) package with 3-pin vertical leadframe configuration. Pin 1 = VCC, Pin 2 = GND, Pin 3 = OUT (open-collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive power supply input | Accepts 3–20 V; powers internal regulator, Hall element, and output driver |
| 2 - GND | Ground reference | Common return path for Hall sensor, amplifier, and output stage |
| 3 - OUT | Open-collector digital output | Sinks up to 25 mA; requires external load or uses internal Rpu for pullup |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Retains state after magnetic trigger - eliminates need for continuous field presence in position sensing |
| Integrated pullup resistor | 7–13 kΩ on-chip - removes external component, improves layout density and reliability |
| High-temperature capability | Rated to +125°C ambient - suitable for engine compartment and industrial motor drive locations |
| Wide supply range | 3–20 V operation - compatible with 5 V logic, 12 V automotive, and 24 V industrial rails |
| RoHS & Green compliant | Lead-free, halogen-free, antimony-free - meets EU RoHS 3 and automotive environmental requirements |
Applications
| 3-Phase BLDC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting rotor pole alignment in brushless DC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Digital Hall latch providing synchronized edge-triggered signals to motor controller logic. Use Value: Enables precise 120° electrical phase sequencing with 80 Gauss hysteresis preventing false triggering during vibration or EMI. |
Use Scenario: Monitoring angular position of rotating shafts in industrial pumps and HVAC blowers. IC Role / Device Role / Timing Role: Bipolar magnetic latch delivering stable high/low states corresponding to N/S pole transitions. Use Value: Delivers repeatable position feedback over −40°C to +125°C without calibration drift or external biasing components. |
| Current Switch Interface | RPM Detection |
Use Scenario: Converting magnetic proximity events into logic-level enable/disable signals for solenoid or relay drivers. IC Role / Device Role / Timing Role: Solid-state switch replacing mechanical contacts in high-cycle-count current control paths. Use Value: 25 mA sink capability directly interfaces with common gate drivers; internal pullup reduces external part count by one resistor. |
Use Scenario: Measuring rotational speed via pulse counting from gear tooth or magnet arrays on rotating machinery. IC Role / Device Role / Timing Role: Edge-generating sensor feeding frequency-to-voltage converters or microcontroller timers. Use Value: Fast magnetic response and noise-immune hysteresis ensure accurate pulse generation up to 20 kHz under thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3722A | Higher sensitivity (Bop: ±10–45 G), lower VCC min (2.5 V), SC59/SIP-3 options | Supports lower-voltage MCU interfaces and tighter magnetic gaps; same thermal rating | Preferred for new designs requiring improved noise margin or 2.5 V system compatibility |
| AH3724A | Wider hysteresis (120 G typ), higher Bop/Brp range (±25–100 G), same packages | Better suited for high-vibration environments or coarse-pole-count rotors with weak fields | Select when operating in mechanically unstable mounts or with low-strength magnets |
Compared with AH173-PG-A-B, AH3722A offers lower supply voltage support and tighter magnetic thresholds for precision timing, while AH3724A provides wider hysteresis for robustness in harsh mechanical environments - both maintain identical thermal and package compatibility.
Availability
AH173-PG-A-B is available at Aetrix Electronics and suitable for 3-phase BLDC motor commutation, industrial rotor position sensing, and RPM detection requiring stable component supply in legacy production programs.
Supply support for AH173-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, specializing in high-reliability signal integrity, power management, and sensing solutions for automotive and industrial markets.
AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in thermally demanding motor-control applications.
FAQ
Is AH173-PG-A-B pin-compatible with AH3722A or AH3724A?
Yes - all three devices share identical SIP-3 and SC59 pinouts (VCC, GND, OUT), enabling drop-in replacement in existing layouts. No PCB redesign is required when migrating from AH173-PG-A-B to either AH3722A or AH3724A, though firmware timing may need adjustment due to differing magnetic thresholds.
What is the maximum allowable junction temperature for AH173-PG-A-B in SIP-3 package?
The absolute maximum junction temperature is +150°C. At +125°C ambient, the SIP-3 package's derated power dissipation is 110 mW (per datasheet Figure 4), limiting continuous output current to ~18 mA at 12 VCC to maintain safe thermal margin under worst-case convection conditions.
Does AH173-PG-A-B require an external pullup resistor?
No - it includes an internal 7–13 kΩ pullup resistor connected to VCC. This eliminates the need for external components in standard open-collector configurations, reducing bill-of-materials cost and PCB footprint while maintaining TTL/CMOS logic compatibility.
Why is AH173 marked "Not Recommended for New Designs"?
Diodes has superseded AH173 with AH3722A/AH3724A, which offer improved magnetic sensitivity, tighter parametric distributions, and enhanced ESD robustness (±4 kV HBM). AH173-PG-A-B remains fully supported for legacy production but lacks qualification to AEC-Q100 Grade 0 and newer automotive change-control requirements.
AH173-PG-A-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 8mT Trip, -8mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3V ~ 20V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Collector
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH173-PG-A-B FAQ
1.How can I place an order for AH173-PG-A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-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 AH173-PG-A-B reliable?
The price and inventory of AH173-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 AH173-PG-A-B is usually 5 days.
3.What payment methods are accepted for AH173-PG-A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-PG-A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-PG-A-B?
AH173-PG-A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-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 AH173-PG-A-B?
For technical support, including AH173-PG-A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-PG-A-B requirements.
6.How does Aetrix verify that AH173-PG-A-B is sourced from the original manufacturer or authorized distributors?
All AH173-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 AH173-PG-A-B meets industry standards.
7.What is the process for return or replacement of AH173-PG-A-B?
All AH173-PG-A-B units undergo pre-shipment inspection (PSI). If there is an issue with AH173-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 AH173-PG-A-B part is unused and in its original packaging.
Return procedure for AH173-PG-A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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