Genuine Motorola MR2835S Avalanche Suppressor Diode for High-Energy Transient Protection
The Motorola 4813979C17 is a high-performance MR2835S avalanche suppressor diode designed for professional repair and maintenance of Motorola radio equipment. This genuine OEM component provides robust protection against high-energy voltage transients, inductive load switching spikes, and surge events that can damage sensitive radio electronics. The surface-mount design with lead-free construction offers reliable protection in an environmentally compliant package.
Key Features
- Genuine Motorola factory replacement part - ensures reliable circuit protection
- MR2835S avalanche suppressor designation for high-energy transient absorption
- Surface-mount design for compact, efficient installation
- High surge current capability for absorbing powerful transients
- Fast response time for immediate overvoltage clamping
- Bidirectional protection against positive and negative voltage spikes
- Lead-free (Pb-Free) construction for RoHS compliance
- Metal can package for excellent heat dissipation and durability
Compatible Models
- Various Motorola commercial and professional two-way radio models
- Used in power supply protection, inductive load suppression, and high-energy surge protection
- Consult your radio's service manual or schematic diagram for exact component location
What's Included
- One (1) Motorola MR2835S avalanche suppressor diode
Application and Installation
Professional Installation Required: This avalanche suppressor diode is a critical protection component that requires proper installation to ensure effective circuit protection. Installation should only be performed by qualified electronics technicians or certified Motorola service centers with experience in SMD component replacement. Improper installation or incorrect component orientation can result in inadequate protection or component failure during high-energy transient events.
Avalanche suppressor diodes are specialized for protecting against high-energy transients that standard TVS diodes may not adequately handle. Common applications include inductive load suppression on relay coils, solenoids, and motor circuits, automotive electrical system protection, power supply input surge suppression, protection against lightning-induced transients, and high-voltage spike clamping in industrial environments. These suppressors excel at absorbing the energy from inductive kickback when switching inductive loads.
Understanding Avalanche Suppressors: Avalanche suppressor diodes operate similarly to TVS diodes but are specifically designed to handle higher energy transients. When voltage exceeds the breakdown threshold, the diode enters avalanche breakdown mode, conducting current to clamp the voltage to a safe level. The metal can package provides excellent thermal dissipation, allowing the component to absorb significant energy without damage.
Critical Installation Notes: Mount the suppressor diode as close as possible to the source of transients for maximum effectiveness. For inductive load protection, install directly across the coil terminals. For power supply protection, place at the input stage near the power entry point. Ensure proper polarity orientation if used in unidirectional applications, though many avalanche suppressors can function bidirectionally.
The surface-mount design requires proper soldering technique. Use adequate heat to achieve good solder joints on the SMD pads, but avoid prolonged heating. After installation, verify circuit operation and test the protected circuit under load conditions. The suppressor should remain inactive during normal operation and only conduct during overvoltage transient events.
When to Replace
Avalanche suppressor diodes can degrade or fail due to repeated exposure to high-energy transients beyond their rated capability, cumulative stress from multiple surge events, or thermal damage from inadequate heat dissipation. A failed suppressor may short circuit, causing power supply issues or circuit malfunction, or it may fail open, leaving circuits unprotected. Replace suppressors after lightning strikes, severe electrical transients, or if the radio exhibits power-related issues following a surge event.
Technical Specifications
- Type: Avalanche Suppressor Diode
- Part Number: MR2835S
- Package: Surface-mount metal can
- Application: High-energy transient suppression
- Configuration: Bidirectional protection capability
- Compliance: Lead-free (Pb-Free) RoHS compliant
- Manufacturer Code: ON 342 (ON Semiconductor)
Part Numbers
- Motorola Part Number: 4813979C17
- Component Designation: MR2835S Avalanche Suppressor
- Package Type: Surface-mount metal can
- Environmental: Pb-Free (Lead-Free)
- Batch Code: 009G (visible on component)
