25G SFP28 ER Transceiver for 30km SMF Links, 1310nm Duplex LC

The FC-LINK SFP28 25G 1310nm 30km ER LC DX transceiver is specifically designed for Ethernet links, supporting data rates of up to 25.78 Gb/s and a transmission distance of up to 30km without FEC. It adheres to SFF-8472 standards and is compatible with SFF-8432 and relevant sections of SFF-8431. Additionally, the product is RoHS-compliant and lead-free in accordance with Directive 2011/96/EU.

SPECIFICATIONS
Product Model	SFP28-25-13-30(ER)-LCD	Manufacturer Brand	FC-LINK
Package Type	SFP28	Optical Connector	Duplex LC
Max Data Rate	25.78G	Channel Data Rate	10.31Gbps
Effective Transmission Distance	30km
Wavelength	1310nm	Operating Voltage	3.3V
Fiber Type	SMF	Core Size	9/125µm
Transmitter Type	EML	Receiver Type	APD
TX Power	0~6dBm	Receiver Sensitivity	<-19dBm
Digital Optical Monitoring(DOM)	YES	Receiver Overload	-5dBm
Power Consumption	≤1.5W	Protocols	MSA, CPRI, eCPRI1
Operating Temperature(Commercial)	0℃~+70℃	Storage Temperature(Commercial)	-40℃~+85℃

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Customization Options

Vendor Coding

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Custom Part Number

Packaging Design

Temperature Grade Selection

Absolute Maximum Ratings
Parameter	Symbol	Min.	Typ.	Max.	Unit
Storage temperature	TS	-40	-	85	°C
Case operating temperature	TA	0	-	70	°C
Maximum supply voltage	Vcc	0	-	3.6	V
Relative humidity	RH	0	-	85	%

Electrical Characteristics
Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply voltage	VCC	3.15	-	3.46	V	-
Supply current	Icc	-	-	450	mA	-
Power consumption	P	-	-	1.5	W	-
Data rate	R	-	25.8	-	Gb/s	-
Transmitter
Input differential impedance	Rin	-	100	-	Ω	1
Differential input voltage swing	Vin,pp	180	-	700	mV	2
Transmit disable voltage	VD	2	-	Vcc	V	3
Transmit enable voltage	VEN	Vee	-	Vee+0.8	V	-
Receiver
Single ended output voltage tolerance	V	-0.3	-	4	V	-
Rx output diff voltage	Vo	185	-	800	mV	-
LOS fault	VLOS fault	2	-	VccHOST	V	4
LOS normal	VLOS norm	Vee	-	Vee+0.8	V	4
Notes: 1.Connected directly to TX data input pins. AC coupling from pins into laser driver IC. 2.Per SFF-8431 Rev 3.0 3.Into 100 ohms differential termination. 4.LOS is an open collector output. Should be pulled up with 4.7k – 10kΩ on the host board. Normal operation is logic 0; loss of signal is logic 1. Maximum pull-up voltage is 5.5V.

Optical Characteristics
Parameter	Symbol	Min.	Typ.	Max	Unit	Notes
Transmitter
Center wavelength	λt	1295	-	1325	nm	-
Spectral width	△λ	-	-	1	nm	-
Average optical power	Pavg	0	-	+6	dBm	1
Laser off power	Poff	-	-	-30	dBm	-
Side mode suppression ratio	-	30	-	-	-	-
Extinction ratio	ER	4	-	-	dB	-
Optical return loss tolerance	-	-	-	-12	dB	-
Receiver
Center wavelength	λr	1260	-	1370	nm	-
Receiver sensitivity	Sen	-	-	-19	dBm	2
Los assert	LOSA	-30	-	-	dBm	-
Los dessert	LOSD	-	-	-19	dBm	-
Los hysteresis	LOSH	0.5	-	-	dB	-
Overload	-	-6	-	-	dBm	-
Notes: 1.Average power figures are informative only, per IEEE802.3CC. 2.Receiver sensitivity is informative. Shall be measured with conformance test signal for . BER =5x 10-5.

Timing Characteristics
Parameter	Symbol	Min.	Typ.	Max.	Unit
TX_disable assert time	t_off	-	-	100	us
TX_disable negate time	t_on	-	-	2	ms
Time to initialize 2-wire interface	t_2w_start_up	-	-	300	ms
Time to initialize	t_start_up	-	-	300	ms
Time to initialize cooled module and time to power up a cooled module to power level II	t_start_up_cooled	-	-	90	s
Time to power up to level II	t_power_level2	-	-	300	ms
Time to power down from level II	t_power_down	-	-	300	ms
Tx_fault assert	Tx_Fault_on	-	-	1	ms
Tx_fault assert for cooled module	Tx_Fault_on_cooled	-	-	50	ms
TX_FAULT reset	t_reset	10	-	-	us
Rx_LOS assert delay	t_los_on	-	-	100	us
Rx_LOS negate delay	t_los_off	-	-	100	us

Digital Diagnostic Specifications
Parameter	Symbol	Min.	Max.	Accuracy	Unit
Transceiver temperature	T	0	+70	±3.0°C	°C
Transceiver supply voltage	DDVoltage	3.15	3.45	±3%	V
Transmitter bias current	DDBias	0	35	±10%	mA
Transmitter output power	DDTx-Power	-5	+5	±2dB	dBm
Receiver average optical input power	DDRx-Power	-16	-3	±2dB	dBm

Pin Description

Pin	Symbol	Name/Description	Plug Seq.
1	VeeT	Module transmitter ground	1
2	TX fault	Module transmitter fault	2
3	TX disable	Transmitter disable; turns off transmitter laser output	3
4	SDL	2 wire serial interface data input/output (SDA)	4
5	SCL	2 wire serial interface clock input (SCL)	4
6	MOD_ABS	Module absent, connect to VeeR or VeeT in the module	2
7	RS0	Rate select0: module inputs and are pulled low to VeeT with >30kΩ resistorsin the module.	-
8	LOS	Receiver Loss of signal indication	-
9	RS1	Rate select1: module inputs and are pulled low to VeeT with >30kΩ resistorsin the module.	-
10	VeeR	Module receiver ground	1
11	VeeR	Module receiver ground	1
12	RD-	Receiver inverted data out put	-
13	RD+	Receiver non-inverted data out put	-
14	VeeR	Module receiver ground	1
15	VccR	Module receiver 3.3V supply	-
16	VccT	Module transmitter 3.3V supply	-
17	VeeT	Module transmitter ground	1
18	TD+	Transmitter non-inverted data out put	-
19	TD-	Transmitter inverted data out put	-
20	VeeT	Module transmitter ground	1
Notes: 1.The module ground pins shall be isolated from the module case. 2.This pin is an open collector/drain output pin and shall be pulled up with 4.7K-10Kohms to Host_Vcc on the host board. 3.This pin shall be pulled up with 4.7K-10Kohms to VccT in the module. 4.This pin is an open collector/drain output pin and shall be pulled up with 4.7K-10Kohms to Host_Vcc on the host board.