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

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)

Motor Drivers (A3xxx, A4xxx, A5xxx)

Hall Sensors (A1xxx, AH series)

Family Prefixes

Current Sensors

Motor Drivers

Hall Effect Sensors

LED Drivers

Current Sensor Rating Codes

Common Series Reference

Current Sensors (most popular)

Motor Drivers (most popular)

Hall Sensors

Handler Implementation Notes

Package Code Extraction

// 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

// 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