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MC33121FN from MOTOROLA

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MC33121FN

Manufacturer: MOTOROLA, MOT

LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT

Partnumber Manufacturer Quantity Availability
MC33121FN MOTOROLA, MOT 70 In Stock

Description and Introduction

LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT The MC33121FN is a semiconductor device manufactured by Motorola. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** Motorola  
- **Part Number:** MC33121FN  
- **Type:** Integrated Circuit (IC)  
- **Package:** 16-Pin Plastic DIP (Dual In-Line Package)  

### **Descriptions:**
- The MC33121FN is a **Subscriber Line Interface Circuit (SLIC)** designed for telecommunications applications.  
- It provides the necessary interface between a telephone line and the switching system.  
- The device supports **battery feed, overvoltage protection, ringing, supervision, and hybrid functions**.  

### **Features:**
1. **Battery Feed:** Supplies DC power to the telephone line.  
2. **Overvoltage Protection:** Protects against high-voltage transients.  
3. **Ringing Control:** Supports AC ringing signal generation.  
4. **Supervision:** Detects off-hook and on-hook conditions.  
5. **Hybrid Function:** Converts between 2-wire and 4-wire interfaces.  
6. **Low Power Consumption:** Optimized for energy efficiency.  
7. **Compatibility:** Works with standard telecom signaling requirements.  

This information is based solely on the manufacturer's provided data for the MC33121FN.

Application Scenarios & Design Considerations

LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT

Alternative Part Number

  • PBL38621/2SOA --: Pin-compatible SLIC/subscriber line interface circuit in the same class as the MC33121, widely used as a direct functional replacement in telecom line card designs.
  • HC55121CM --: Monolithic SLIC offering comparable battery-feed and supervision functions, commonly cross-referenced for Motorola MC33121 sockets.
  • TP33121N --: Equivalent-function SLIC device with similar supply and interface characteristics, usable as a drop-in alternative after pinout verification.
  • PBL3717A --: Similar function integrated circuit in a comparable package, widely available and often used as a drop-in substitute in legacy designs.
  • L293D --: Common motor/relay driver IC with similar drive capability and DIP package, suitable for many circuits that used the original part.
  • SN754410 --: Quad half-H driver with comparable electrical characteristics and pin-compatible DIP footprint, a practical alternative for replacement.

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