---
title: "WIZnet Ethernet Microcontroller (MCU) Selection Guide"
url: "https://maker.wiznet.io/ronpang/projects/wiznet-ethernet-microcontroller-mcu-selection-guide/"
markdown_url: "https://maker.wiznet.io/ronpang/projects/wiznet-ethernet-microcontroller-mcu-selection-guide/md"
type: "WCC: WIZnet Created Content"
author: "ronpang"
author_url: "https://maker.wiznet.io/ronpang/"
published: "2026-01-23"
language: "en"
likes: 0
views: 999
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# WIZnet Ethernet Microcontroller (MCU) Selection Guide

> WIZnet's 5 Ethernet MCUs: From Cortex-M3 with hardware TCP/IP/crypto to compact dual-core options for industrial, secure POS, and IoT applications.

## Article

**Preface**

This article focuses on WIZnet's 5 core Ethernet microcontrollers (W55MH32, W55MH32-L, W55MH32-Q, W55RP20, W7500P). Each model has distinct emphases on computing power, package size, interface expansion, and security features, covering a full spectrum of needs including industrial multi-device control, compact handheld terminals, high-security encrypted communication, and lightweight networking nodes. They precisely match diverse hardware design requirements, from simple peripheral connectivity to high-load multitasking, helping you quickly identify suitable solutions and reduce selection and development costs.

![](https://maker.wiznet.io/upload/ckeditor5/419353359%5F1769193039%2Epng)

---

## Core Features of Each Chip

### **W55MH32-LArchitecture:** Cortex-M3 @ 216MHz + **Hardware TCP/IP StackMemory:** 1024KB Flash / 96KB RAM

**Interfaces:** UART × 5, CAN, USB 2.0 (Comprehensive multi-interface coverage)

**Security:** Hardware Encryption (DES, SHA, AES) + True Random Number Generator (TRNG)

**Specs:** Industrial temperature range, suitable for complex industrial environments.

**Applications:** Multi-interface industrial control terminals, encrypted POS systems, PLC data gateways.

### **W55MH32-QArchitecture:** Same core as W55MH32-L + **Hardware TCP/IP Stack + 32KB dedicated Ethernet bufferPackage:** QFN68 small package (8×8mm), saves 55% PCB space.

**Interfaces:** UART × 4, CAN, USB 2.0 (Core interfaces retained, balancing miniaturization and practicality).

**Applications:** Handheld ticket printers, small vending machines, space-constrained terminals.

### **W55RP20Architecture:** Dual Cortex-M0+ @ 133MHz (Supports parallel task processing)

**Memory:** 2MB Flash / 264KB RAM

**Performance:** 38Mbps throughput + 16 PWM channels.

**Networking:Hardware TCP/IP Stack + 32KB dedicated buffer** (Network communication doesn't consume core CPU resources).

**Applications:** Power grid data acquisition, lighting dimming systems, industrial multi-actuator control.

### **W7500Architecture:** Cortex-M0 @ 48MHz

**Memory:** 128KB Flash / 16KB RAM (Basic configuration)

**Interfaces:** UART × 3, PWM × 8 (Expansion requires additional chips).

**Networking:** Hardware TCP/IP Stack.

### **W7500PArchitecture:** Same computing power as W7500.

**Specs:** Operating temperature range 0°C to 70°C.

**Networking:** Hardware TCP/IP Stack.

---

## Quick Selection Guide

| Decision Dimension | Criteria | Recommended Model(s) |
| --- | --- | --- |
| **Core Architecture Need** | **Need High Performance?** | W55MH32 / W55RP20 |
| **Package Size Need** | **Need Small Package?** | W55MH32-Q / W55RP20 |
| **Security Feature Need** | **Need Hardware Encryption (DES/AES/SHA) + TRNG?** | W55MH32 |
| **UART Quantity Need** | **Need 5, 4, or 2 UARTs for multi-device comms?** | 5 → W55MH32-L; 4 → W55MH32-Q; 2 → W55RP20 |
| **GPIO Expansion Need** | **Need extensive GPIO for peripherals? (66, 36, or 23 pins)** | 66 → W55MH32-L; 36 → W55MH32-Q; 23 → W55RP20 |
| **Code Compatibility** | **Compatible with STM32F103 code?** | W55MH32 |

---

## Core Parameters & Feature Comparison

| **Model** | **Core / Freq.** | **Memory** | **Package / Key Interfaces** | **Core Features** | **Typical Applications** |
| --- | --- | --- | --- | --- | --- |
| W55MH32-L | Cortex-M3 / 216MHz | 1024KB/96KB | QFN100 / UART×5, CAN, USB2.0 | High power + HW TCP/IP + Multi-I/F + HW Crypto + TRNG | Industrial Control, Encrypted POS, PLC Gateways |
| W55MH32-Q | Cortex-M3 / 216MHz | 1024KB/96KB | QFN68 / UART×4, CAN, USB2.0 | Compact + HW TCP/IP + High Freq + Industrial Temp | Handheld Printers, Small Vending Machines |
| W55RP20 | Dual Cortex-M0+ / 133MHz | 2MB/264KB | QFN68 / UART×2, PWM×16 | Dual-core + HW TCP/IP + Large Memory + Parallel Comm | Data Acquisition, Dimming Systems, Multi-Actuator Control |
| W7500 | Cortex-M0 / 48MHz | 128KB/16KB | TQFP64 / UART×3, PWM×8 | Basic Ethernet + HW TCP/IP Stack | Minimalist Scenarios |
| W7500P | Cortex-M0 / 48MHz | 128KB/16KB | TQFP64 / UART×3, PWM×8 | Basic Config + Commercial Temp Range + HW TCP/IP Stack | Minimalist Scenarios |

---

## Common Selection Q&A

**What's the advantage of a Hardware TCP/IP Stack?**
→ It processes network data independently, freeing the MCU's core resources. It's more stable than software stacks and supports smoother multi-protocol operation.

**Does the small W55MH32-Q package reduce performance?**
→ No! Only the package and some pins are reduced. The core configuration and HW TCP/IP functionality are identical to the W55MH32-L.

**Is hardware encryption necessary?**
→ It's essential for payment systems and industrial sensitive data scenarios. It doesn't consume CPU resources and effectively prevents data tampering.

---

## Typical Application Case References

**W55MH32-L:** Industrial PLC Data Gateway (Parallel protocols + CAN interface + HW encryption + Stable HW TCP/IP networking).

**W55MH32-Q:** Wired Handheld POS Terminal (Compact + Multi-interface + HW TCP/IP + High frequency for fast transaction processing).

**W55RP20:** Distributed Lighting Dimming System (Dual-core parallelism + 16-channel PWM dimming + HW TCP/IP for high-speed data sync).

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Source: https://maker.wiznet.io/ronpang/projects/wiznet-ethernet-microcontroller-mcu-selection-guide/