PA550-DP-PP – 40-Pin DIP Socket to 44-Pin PLCC Emulator Adapter (Intel 87C550)

Overview

PA550-DP-PP is a PLCC emulator adapter designed for the Intel 87C550 microcontroller. As a result, engineers can evaluate and emulate 87C550 devices packaged in 40-pin DIP format using systems that require a 44-pin PLCC emulator interface.

On the top side, the adapter provides a 40-pin DIP socket on 0.100″ (2.54 mm) pitch. Therefore, it supports DIP-packaged 87C550 devices commonly used in legacy embedded designs and firmware development environments.

On the bottom side, the adapter presents a 44-pin PLCC plug. Consequently, it inserts directly into PLCC emulator sockets without additional cabling or interposers.

This adapter uses device-specific wiring rather than full 1:1 pin mapping. Instead, it aligns 87C550 port, oscillator, programming, and power signals to the PLCC footprint. The Adapter Wiring table below lists the exact connections.

Technical Specifications

• Part Number: PA550-DP-PP
• Adapter Type: PLCC Emulator Adapter
• Top Interface: DIP-40 socket, 0.100″ (2.54 mm) pitch
• Bottom Interface: PLCC-44 plug
• Wiring Configuration: 87C550-specific wiring (see Adapter Wiring)
• Device Support: Intel 87C550
• Pitch: DIP side 0.100″ (2.54 mm); PLCC side 0.050″ (1.27 mm)
• JEDEC Reference: PLCC-44, MS-018
• Mount Interface: PLCC-44 plug insertion
• Typical Applications: Microcontroller emulation, firmware development, legacy system validation
• Compatibility: PLCC-44 emulator sockets supporting 87C550 workflows

Adapter Wiring

The following chart shows the connections from the DIP socket pins to the adapter’s PLCC plug pins. The wiring reflects the specific requirements of the 87C550 device, including duplicated power pins and defined pull-up connections.

Key Features

• DIP-40 socket supports Intel 87C550 devices
• PLCC-44 plug interfaces directly with emulator sockets
• Device-specific wiring with duplicated power and ground connections
• Includes defined pull-up connections for proper device operation

Applications

• Intel 87C550 microcontroller emulation
• Firmware development and debugging
• Legacy embedded system validation
• Engineering and laboratory testing

Package Includes

• One PA550-DP-PP DIP-40 socket to PLCC-44 emulator adapter

Compatibility Note

This adapter does not use 1:1 wiring. Instead, it applies 87C550-specific pin mapping, including duplicated power pins and defined pull-up connections. Verify emulator and device requirements before use.

Why Choose This Adapter

PA550-DP-PP provides documented wiring for reliable 87C550 emulation in PLCC-based systems. Moreover, it eliminates uncertainty when working with legacy microcontrollers.

Streamline Your Workflow

Use this adapter to integrate DIP-based 87C550 devices into PLCC emulator environments efficiently.