★HF-A21

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Overview of Characteristic

● Support IEEE802.11b/g/n Wireless Standards

● Support TCP/UDP/HTTP Network Protocols

● Support UART/Ethernet Data Interface

● Support Work As STA/AP/AP+STA Mode

● Support Router/Bridge Mode Networking

● Support Internal/External Antenna Option

● Support AT+ Instruction Set for Configuration

● Support Friendly Web Configuration Page

● Support Palmodic Signal

● Support Smart Link Application Tools

● Single +3.3V Power Supply

● Small Size: 25 x 40 x 8mm

● FCC/CE/Telec Certificated

Class	Item	Parameters
Wireless Parameters	Certification	FCC/CE/Telec
	Wireless standard	802.11 b/g/n
	Frequency range	2.412GHz-2.484GHz
	Transmit Power	802.11b: +20 dBm (Max.)
		802.11g: +18 dBm (Max.)
		802.11n: +15 dBm (Max.)
		Configurable
	ReceiverSensitivity	802.11b: -89 dBm
		802.11g: -81 dBm
		802.11n: -71 dBm
	Antenna Option	External: I-PEX connector or PIN25 line out
	Antenna Option	Internal: On-board PCB antenna
Hardware Parameters	Data Interface	UART: 1200bps - 230400bps
		Ethernet: 10Mbps/100Mpbs
		GPIO,I2C,USB
	Operating Voltage	3.3V (+/-5%)
	Operating Current	Avg:170mA Peak:400mA
	Operating Temperature	-40℃- 85℃
	StorageTemperature	-45℃- 125℃
	Dimensions and Size	25×40×8mm
Software Parameters	Network Type	STA /AP/AP+STA mode
	Security Mechanisms	WEP/WPA-PSK/WPA2-PSK/WAPI
	Encryption	WEP64/WEP128/TKIP/AES
	Work Mode	Transparent Transmission
	Serial command	AT+instruction set
	Network Protocol	TCP/UDP/ARP/ICMP/DHCP/DNS/HTTP
	Max. TCP Connection	32
	User Configuration	Web Server＋AT command config.
	User Application SW	Support customized application SW Provide SDK package Provide smart link tools

HF-A21
Base on customer detailed requirement, HF-A21 series modules provide different variants and physical type for detailed application.

Production Data	2016/Q1(New)
Key Feature	Hardware AP Solution Ethernet SDK Support Lower Price
Processor	MIPS SOC
Basic Frequency	380MHz
Operating System	Ecos
Wi-Fi Standard	802.11bgn
Certification	CE/FCC
Temp. Range	-40~+85
Internal Antenna	√
I-PEX Connector	√
Size (mm)	25×40×8
Package Type	DIP2x7
Work Voltage	3.3V
Current @No data	~170mA
Current @Tx Peak	~400mA
Resource-Flash	2MB
Resource-RAM	8MB
Interface-UART	1
Interface-Ethernet	√
Interface-GPIO	√
AP Mode	√(Max 20 STA)
STA Mode	√
AP+STA Mode	√
Wi-Fi Repeater	√
Web Server	√
OTA Upgrade	√
SDK Support	√

Applications: HF-A11_Mass_Production_Upgrade [ Download Times: 1524, Date Update: 2016-11-21 18:11:00 ]

User Guide: A21_A21-SMT application [ Download Times: 1629, Date Update: 2020-03-18 09:45:32 ]
: HF-A21 High Performance Series Wi-Fi User Manual V1.31(20250901 [ Download Times: 113, Date Update: 2025-09-01 18:07:37 ]
: HF-A21高性能系列Wi-Fi模组用户手册 V1.31(20250901) [ Download Times: 112, Date Update: 2025-09-01 18:08:12 ]