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

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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

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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

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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

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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

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Related Files

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

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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