Agent skill

allegro

Allegro MicroSystems MPN encoding patterns, suffix decoding, and handler guidance. Use when working with current sensors, motor drivers, or Hall effect sensors.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/allegro

SKILL.md

Allegro MicroSystems Manufacturer Skill

MPN Structure

Allegro MPNs follow this general structure:

[FAMILY][SERIES][PACKAGE][VARIANT]-[RATING]-[SUFFIX]
   │       │       │        │         │        │
   │       │       │        │         │        └── T = Tape/Reel, Pb-free
   │       │       │        │         └── Current rating (05B = 5A bidirectional)
   │       │       │        └── TR = Tape and Reel
   │       │       └── Package code (ELC, LLC, SE, etc.)
   │       └── Series number (712, 723, 4988, etc.)
   └── Family prefix (ACS, A, AH, AAS)

Example Decoding

ACS712ELCTR-05B-T
│  │  │   │  │  │
│  │  │   │  │  └── T = Pb-free/Tape and Reel qualifier
│  │  │   │  └── 05B = 5A bidirectional current sensing
│  │  │   └── TR = Tape and Reel packaging
│  │  └── ELC = SOIC-8 package
│  └── 712 = Series number
└── ACS = Current Sensor family

A4988SETTR-T
│    │   │
│    │   └── T = Tape and Reel
│    └── SETTR = QFN package, Tape and Reel
└── A4988 = Stepper motor driver

A1324LLHLT-T
│    │    │
│    │    └── T = Tape and Reel
│    └── LLHLT = SOT-23 package (LLH), Tape and Reel
└── A1324 = Linear Hall effect sensor

Package Codes

Current Sensors (ACS7xx, ACS37xxx)

Code Package Notes
ELC SOIC-8 Standard 8-pin SOIC
LLC SOIC-8 Leadless version
KLC SOIC-8-EP Enhanced thermal pad
LH SOT-23 Small outline package

Motor Drivers (A3xxx, A4xxx, A5xxx)

Code Package Notes
SE/SET QFN Quad Flat No-leads
SL/SLB SOIC-24 24-pin SOIC
ET QFN QFN variant
KLJ TO-92 Through-hole

Hall Sensors (A1xxx, AH series)

Code Package Notes
LUA SIP-3 Single in-line (3-pin)
EUA SIP-4 Single in-line (4-pin)
LH/LLH SOT-23 Small outline transistor
KUA TO-92 Through-hole

Family Prefixes

Current Sensors

Prefix Category Examples
ACS7xx Hall-effect current sensors ACS712, ACS723, ACS758
ACS37xxx Coreless current sensors ACS37612, ACS37030

Motor Drivers

Prefix Category Examples
A39xx Stepper motor drivers A3967 (Easy Driver)
A49xx Stepper motor drivers A4988 (common in 3D printers)
A59xx BLDC motor drivers A5931, A5932

Hall Effect Sensors

Prefix Category Examples
A13xx Linear Hall sensors A1301, A1324, A1325, A1326
AH Hall switches AH3362, AH3366

LED Drivers

Prefix Category Examples
A6xxx General LED drivers A6261, A6262
A8xxxx High power LED drivers A80601, A80604

Current Sensor Rating Codes

Suffix Meaning
05B ±5A bidirectional
10B ±10A bidirectional
20A ±20A bidirectional
30A ±30A bidirectional
40AB ±40A bidirectional
05AU 0-5A unidirectional
20AU 0-20A unidirectional

Common Series Reference

Current Sensors (most popular)

Series Type Use Case
ACS712 Hall-effect, isolated Arduino current sensing, power monitoring
ACS723 Hall-effect, low noise Precision current measurement
ACS758 Hall-effect, high current Industrial, automotive
ACS37612 Coreless, differential Battery management, motor control

Motor Drivers (most popular)

Series Type Use Case
A4988 Stepper, microstepping 3D printers, CNC machines
A3967 Stepper, Easy Driver Hobbyist robotics
A4950 DC brushed motor Simple motor control
A4953 DC brushed, full bridge H-bridge applications

Hall Sensors

Series Type Use Case
A1324/5/6 Linear, ratiometric Position sensing, current sensing
A1301/2 Linear, analog output Proximity sensing
AH33xx Hall switch, latching RPM measurement, position detection

Handler Implementation Notes

Package Code Extraction

java
// Current sensors use letter codes after series number
// ACS712ELCTR -> ELC = SOIC-8
// ACS723LLCTR -> LLC = SOIC-8 (leadless)
// ACS723KLCTR -> KLC = SOIC-8-EP (enhanced thermal pad)

// Motor drivers use suffix codes
// A4988SETTR -> SET = QFN
// A3967SLBT -> SLB = SOIC-24

// Hall sensors use suffix codes
// A1324LUA -> LUA = SIP-3
// A1324LLH -> LLH = SOT-23

Series Extraction

java
// Current sensors: Extract full ACSxxx or ACS3xxxx
// ACS712ELCTR-05B-T -> ACS712
// ACS37612LLCATR-030B5-T -> ACS37612

// Motor drivers: Extract Axxxx (5 chars)
// A4988SETTR-T -> A4988
// A3967SLBT -> A3967

// Hall sensors: Extract A1xxx (5 chars) or AHxxxx (6 chars)
// A1324LUA-T -> A1324
// AH3362Q -> AH3362

Related Files

  • Handler: manufacturers/AllegroHandler.java
  • Component types: SENSOR_CURRENT, MOTOR_DRIVER, HALL_SENSOR, LED_DRIVER, SENSOR, IC
  • Test: handlers/AllegroHandlerTest.java

Learnings & Edge Cases

  • ACS712 is extremely common - Found in nearly every Arduino/hobbyist current sensing project
  • A4988 is the de facto standard - Used in most 3D printers (Prusa, Creality, etc.)
  • Package code position varies - Current sensors embed it in part number, motor drivers use suffixes
  • LLC vs ELC - Both are SOIC-8; LLC is leadless variant with same footprint
  • KLC = Enhanced thermal - SOIC-8-EP with exposed thermal pad for better heat dissipation
  • TR suffix - Appears before final -T suffix, indicates tape and reel (e.g., ELCTR = ELC + TR)
  • -T suffix meaning varies - Can mean tape/reel OR Pb-free; Allegro uses it for both
  • Current rating codes - B = bidirectional, U = unidirectional, A often appears in newer sensors

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