25G SFP28 ER Transceiver for 40km SMF Links, 1310nm Duplex LC

The FC-LINK SFP28 25G 1310nm 40km ER LC DX is an ultra-compact optical transceiver module designed to convert 25Gbps serial CML electrical data into optical signals in compliance with the 25GBASE-ER standard. Its electrical interface adheres to SFI specifications, while the EML transmitter and APD receiver deliver exceptional performance for Ethernet applications, supporting links of up to 40km over single-mode fiber (SMF).This SFP28 ER module is fully compliant with SFF-8431, SFF-8432, and IEEE 802.3CC 25GBASE-ER standards. It also supports digital diagnostic functions via a 2-wire serial interface, as outlined in SFF-8472.With a fully SFP-compliant form factor, the module offers hot-pluggability, seamless optical port upgrades, and low EMI emissions, making it a reliable and efficient solution for high-speed networking.

SPECIFICATIONS
Product Model	SFP28-25-13-40(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	40km
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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Packaging Design

Temperature Grade Selection

Absolute Maximum Ratings
Parameter	Symbol	Min.	Typ.	Max.	Unit	Ref.
Storage temperature	TS	-40	-	+85	°C	-
Case operating temperature	TA	0	-	70	°C	-
Maximum supply voltage	Vcc	0	-	3.6	V	-
Relative humidity	RH	5	-	95	%	-

Electrical Characteristics
Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply voltage	VCC	3.135	-	3.465	V	-
Supply current	Icc	-	-	450	mA	-
Power consumption	P	-	-	1.5	W	-
Data rate	R	-	25.78	-	Gb/s	-
Transmitter Section:
Input differential impedance	Rin	-	100	-	Ω	1
Tx input single ended DC voltage tolerance (Ref VeeT)	V	-0.3	-	4	V	-
Differential input voltage swing	Vin,pp	180	-	700	mV	2
Transmit disable voltage	VD	2	-	Vcc	V	-
Transmit enable voltage	VEN	Vee	-	Vee+0.8	V	-
Receiver section:
Single ended output voltage tolerance	V	-0.3	-	4	V	-
Rx output diff voltage	Vo	150	-	900	mV	-
Rx output rise and fall time	Tr/Tf	9.5	-	-	ps	3
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 3.20%～80% 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 Section:
Center wavelength	λt	1295	-	1310	nm	-
Spectral width	△λ	-	-	1	nm	-
Average optical power	Pavg	0	-	+6	dBm	1
Laser off power	Poff	-	-	-30	dBm	-
Extinction ratio	ER	4	-	-	dB	-
Receiver Section:
Center wavelength	λr	1295	-	1325	nm	-
Receiver sensitivity(OMA)	Sen	-	-	-19	dBm	2
Stressed sensitivity(OMA)	Sen2	-	-	-16.5	dBm	2
Los assert	LOSA	-30	-	-	dBm	-
Los dessert	LOSD	-	-	-11	dBm	-
Los hysteresis	LOSH	0.5	-	5	dB	-
Overload	-	-9	-	-	dBm	3
Receiver reflectance	-	-	-	-12	dB	-
Notes: 1.Average power figures are informative only, per IEEE802.3CC. 2.Conditions of stressed receiver tests per IEEE802.3CC. At 5E-5 BER. 3.Receiver overload specified in OMA and under the worst comprehensive stressed condition.

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 include reset of TX_FAULT	t_int	-	-	300	ms
TX_FAULT from fault to assertion	t_fault	-	-	1	ms
TX_disable time to start reset	t_reset	10	-	-	us
Receiver loss of signal assert time	TA,RX_LOS	-	-	100	us
Receiver loss of signal deassert time	Td,RX_LOS	-	-	100	us
Rate-select chage time	t_ratesel	-	-	10	us
Serial ID clock time	t_serial-clock	-	-	100	kHz

Digital Diagnostic Monitoring Information
Data Address	Parameter	Accuracy	Unit
96-97	Transceiver internal temperature	±3.0	℃
98-99	VCC3 internal supply voltage	±3.0	%
100-101	Laser bias current	±10	%
102-103	Tx output power	±2.0	dBm
104-105	Rx input power	±2.0	dBm

Pin Assignment

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.