25GBASE-SR SFP28 850nm 100m LC MMF Transceiver

SPECIFICATIONS
Product Model	SFP28-25-85-01(SR)-LCD	Manufacturer Brand	PHILISUN
Package Type	SFP28	Optical Connector	Duplex LC
Max Data Rate	25.78G	Channel Data Rate	10.31Gbps
Effective transmission distance(OM3)	70m	Effective transmission distance(OM4)	100m
Wavelength	850nm	Operating Voltage	3.3V
Fiber Type	MMF	Core Size	50/125µm
Transmitter Type	VCSEL	Receiver Type	PIN
TX Power	-8.4~2.4dbm	Receiver Sensitivity	＜-6dBm
Digital Diagnostic Monitoring(DDM)	YES	Receiver Overload	2.4dBm
Power Consumption	<1.0W	Protocols	SFF-8472, SFF-8024, SFF-8431, SFF-8432
Operating temperature(Commercial)	0℃~+70℃	Storage Temperature(Commercial)	-40℃~+85℃
Operating temperature(Industrial)	-40℃~+85℃	Storage Temperature(Industrial)	-40℃~+85℃

PRODUCT PRESENTATION

The PHILISUN SFP28 25G 850nm 100m SR LC DX transceiver is optimized for 25.78Gbps data transmission over multimode fiber. Fully compliant with the SFF-8431 standard, its SFP+ mechanical design is compatible with the SFF-8432 specification.This module supports digital diagnostic monitoring through a 2-wire serial interface, as outlined in the SFF-8472 standard, ensuring precise performance monitoring and simplified network management.

TRANSCEIVER SERIES PRODUCTS

PRODUCTION & TESTING EQUIPMENT

25G 850nm 100M SR LC DX transceiver production and testing equipment

PERFORMANCE PARAMETER

Absolute Maximum Ratings
Parameter	Symbol	Min.	Max.	Unit
Supply voltage	Vcc	-0.3	+4.0	V
Storage temperature	Ts	-40	+85	℃
Operating humidity	RH	0	+85	%

General Specifications
Parameter	Symbol	Min	Typ.	Max	Unit
Bit rate	BR	–	25.78	–	Gbps
Bit Error ratio	BER	–	–	5*10E-5	–
Max. supported link length	Lmax	–	–	100	m

Recommended Operating Conditions
Parameter	Symbol	Min.	Typ.	Max.	Unit
Operating temperature	Tc	0	–	+70	°C
Power supply voltage	Vcc	3.1	3.3	3.46	V
Bit rate	BR	–	25.78	–	Gbps
Max. supported link length	LMAX	–	–	100	m

Electrical Characteristics
Parameter	Symbol	Min.	Typ.	Max	Unit	Note
Supply voltage	Vcc	3.14	3.3	3.46	V	–
Supply current	Icc	–	–	230	mA	–
Transmitter
Input differential impedance	RIN	80	100	120	Ω	1
Single ended data input swing	VIN	90	–	150	mVp-p	–
Transmit disable voltage	VDIS	2	–	VCCHOST	V	–
Transmit enable voltage	VEN	VEE	–	VEE+0.8	V	–
Transmit fault assert voltage	VFA	2	–	VCCHOST	V	–
Transmit fault de-assert voltage	VFDA	VEE	–	VEE+0.8	V	–
Receiver
Single ended data output swing	VOD	200	–	500	mVpp	–
LOS fault	VLOSFT	2	–	VCCHOST	V	–
LOS normal	VLOSFT	VEE	–	VEE+0.8	V	–
*Notes:Differential between TD+ / TD–.

Optical Characteristics
Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Nominal wavelength	λ	840	–	860	nm	–
Spectral width	∆λ	–	–	0.6	nm	–
Optical modulation amplitude	POMA	-6.4	–	3	dBm	–
Optical output power	POFF	-8.4	–	2.4	dBm	–
Extinction ratio	ER	2	–	–	dB	–
Transmitter dispersion penalty	TDP	–	–	5	dB	–
Average launch power of OFF Transmitter	POFF	–	–	-30	dBm	–
Receiver
Center wavelength	λ	840	–	860	nm	–
Average receiver power	PAVG	-10.3	–	2.4	dBm	1
Stressed receiver sensitivity(OMA)	RSENSE	–	–	-5.2	dBm	2
Receiver reflectance	RREFL	–	–	-12	dB	–
Assert LOS	LOSA	-30	–	–	dBm	–
De-assert LOS	LOSD	–	–	-13	dBm	–
LOS hysteresis	0.5				dB	–
Notes: 1. Sensitivity for 25.78G PRBS 231-1 and BER better than or equal to 5*10E-5. 2. The stressed sensitivity values in the table are for system level BER measurements which include the effects of CDR circuit.

PIN ASSIGNMENT

Pin Number	Symbol	Name	Description
1,17,20	VeeT	Transmitter signal ground	These pins should be connected to signal groundon the host board.
2	TX fault	Transmitter fault out (OC)	Logic “1” output = Transmitter fault Logic “0” output = Normal operation This pin is open collector compatible, and should be pulled up to host Vcc with a 10kΩ resistor.
3	TX disable	Transmitter disable in (LVTTL)	Logic “1” input (or no connection) = Laser off Logic “0” Input = Laser on This pin is internally pulled up to VccT with a 10 kΩ resistor
4	SDA	Module definition identifiers	Serial ID with SFF 8472 diagnostics module definition pins should be pulled up to Host Vcc with 10 kΩ resistors.
5	SCL
6	MOD-ABS
7	RS0	Receiver rate select (LVTTL) Transmitter rate select (LVTTL)	NA
9	RS1		NA
8	LOS	Loss of signal out (OC)	This pin is open collector compatible, and should be pulled up to host Vcc with a 10kΩ resist
10,11,14	VeeR	Receiver signal ground	These pins should be connected to signal groundon the host board.
12	RD-	Receiver negative DATA out (CML)	Light on = logic “0” output receiver DATA output is internally AC coupled and series terminated with a 50Ω resistor.
13	RD+	Receiver positive DATA out(CML)	Light on = Logic “1” output receiver DATA output is internal ly AC coupled and series terminated with a 50 Ω resistor.
15	VccR	Receiver power supply	This pin should be connected to a filtered +3.3V power supply on the host board. See figure 3.recommended power supply filter
16	VccT	Transmitter power supply	This pin should be connected to a filtered +3.3V power supply on the host board. See figure 3.recommended power supply filter
18	TD+	Transmitter positive DATA in(CML)	Logic “1” input = light on transmitter DATA inputs are internally AC coupled and terminated with a differential 100Ω resistor.
19	TD-	Transmitter negative DATA in(CML)	Logic “0” input = light on transmitter DATA inputs are internally AC coupled and terminated with a differential 100Ω resistor.