FIGURE 2-1: 24-PIN 4 MM X 4 MM…

KSZ8091RNA

IC PHY 10/100BASE-TX RMII EEE 24-QFN

KSZ8091RNA is a 10/100BASE-T Ethernet PHY transceiver supporting RMII interface and EEE power-saving mode, in a 24-pin QFN package, with an operating temperature range of -40°C to +85°C.Checked against the datasheet

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Technical parameters

Key specs

Supply voltage1.2 ~ 3.3 V

Datasheet-verified parameters

22 items

Parameter	Value and test conditions	Source
Protocol	10BASE-T/100BASE-TX IEEE 802.3 Compliant
Data Rate	10/100 Mbps
Supply Voltage	Single 3.3V Power Supply with VDD I/O Options for 1.8V, 2.5V, or 3.3V; Built-In 1.2V Regulator for Core
Package	24-Pin (4 mm × 4 mm) QFN
Operating Temperature	Industrial: –40°C to +85°C
Grade	Industrial
Recommended Operating Conditions	Supply Voltage (VDDIO, VDDA_3.3) = 3.3V; Ambient Temperature (TA Industrial) = –40°C to +85°C
Absolute Maximum Ratings	Supply Voltage (VDD_1.2): –0.5V to +1.8V; Storage Temperature (TS): –55°C to +150°C; Lead Temperature (soldering, 10s): +260°C
Supply Current (10BASE-T)	Typ: 41 mA (VDDIO, VDDA_3.3 = 3.3V, Full-duplex traffic @ 100% utilization)
Supply Current (100BASE-TX)	Typ: 47 mA (VDDIO, VDDA_3.3 = 3.3V, Full-duplex traffic @ 100% utilization)
Supply Current (EEE Mode)	Typ: 23 mA (VDDIO, VDDA_3.3 = 3.3V, TX and RX paths in LPI state with no traffic)
Supply Current (Power-Down Mode)	Typ: 4 mA (VDDIO, VDDA_3.3 = 3.3V, Software power-down)
Input High Voltage	Min: 2.0 V (VDDIO=3.3V); Min: 1.8 V (VDDIO=2.5V); Min: 1.3 V (VDDIO=1.8V)
Input Low Voltage	Max: 0.8 V (VDDIO=3.3V); Max: 0.7 V (VDDIO=2.5V); Max: 0.5 V (VDDIO=1.8V)
Output High Voltage	Min: 2.4 V (VDDIO=3.3V); Min: 2.0 V (VDDIO=2.5V); Min: 1.5 V (VDDIO=1.8V)
Output Low Voltage	Max: 0.4 V (VDDIO=3.3V); Max: 0.4 V (VDDIO=2.5V); Max: 0.3 V (VDDIO=1.8V)
LED Output Drive Current	Typ: 8 mA (LED0 pin)
100BASE-TX Peak Differential Output Voltage	Min: 0.95 V, Max: 1.05 V (100Ω termination across differential output)
10BASE-T Peak Differential Output Voltage	Min: 2.2 V, Max: 2.8 V (100Ω termination across differential output)
ESD Protection	HBM ESD Rating (6 kV)
Thermal Resistance	+49.22°C/W (θJA)
Maximum Junction Temperature	+125°C (TJ max.)

All parameters (8)ExpandCollapse

Power
Supply Voltage (VDD_1.2)	1.2V
Supply Voltage (VDDA_3.3)	3.3V
Supply Voltage (VDDIO)	3.3V, 2.5V, or 1.8V
Environment and package
Lead Temperature (soldering, 10s)	+260°C
Package	24-Pin (4 mm × 4 mm) QFN
Storage Temperature (TS)	–55°C to +150°C
Other
Interface	RMII V1.2
Speed	10/100 Mbps

Pinout and package

Pin	Name	Function
1	VDD_1.2	(1.2V Core Power)
2	VDDA_3.3	(3.3V Analog Power)
3	RXM	(Physical receive or transmit signal (- differential))
4	RXP	(Physical receive or transmit signal (+ differential))
5	TXM	(Physical transmit or receive signal (- differential))
6	TXP	(Physical transmit or receive signal (+ differential))
7	XO	(Crystal Feedback for 25 MHz Crystal)
8	XI	(25 MHz or 50 MHz Clock Input)
9	REXT	(Set PHY Transmit Output Current)
10	MDIO	(Management Interface Data I/O)
11	MDC	(Management Interface Clock Input)
12	RXD1	(RMII Receive Data Output[1])
13	RXD0	(RMII Receive Data Output[0])
14	VDDIO	(3.3V, 2.5V, or 1.8V Digital Power)
15	CRS_DV	/ PHYAD[1:0] (Carrier Sense/Receive Data Valid or PHY Address)
16	REF_CLK	(50 MHz RMII Reference Clock Output)
17	RXER	/ PME_EN (RMII Receive Error or PME Enable)
18	INTRP/	PME_N2 (Interrupt Output or PME_N Output)
19	TXEN	(RMII Transmit Enable Input)
20	TXD0	(RMII Transmit Data Input[0])
21	TXD1	(RMII Transmit Data Input[1] or NAND Tree Output)
22	GND	(Ground)
23	LED0/	PME_N1/ ANEN_SPEED (LED Output or PME_N Output or Auto-Negotiation/Speed Config)
24	RST#	(Chip Reset, Active Low)
PADDLE	GND	(Ground)

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DatasheetDatasheet · 1.1 MB · 2026-10-29

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