Ascent’s SFP28 25Gb/s transceiver is an integrated fiber optic transceiver that provides a high-speed serial link at signaling rates up to 25.78 Gb/s. It is a single- channel, pluggable, fiber-optic module for short-range data communication and interconnect Ethernet applications. This module is designed to operate over multimode fiber systems using a nominal wavelength of 850nm. It has a transmission distance of up to 70 m on OM3 and 100 m on OM4 multi-mode fibers. The optical interface uses duplex LC receptacle. This module incorporates Gigalight Technologies proven circuit and VCSEL technology to provide reliable long life, high performance, and consistent service. The SFP28-25LP-85-01 module complies with SFF-8431 and SFF 8472 standards. It features a metal enclosure for lower EMI and utilizes a 2-wire interface that is compliant with the serial communication protocol as defined in the SFP+ MSA. It also provides a unique integrated digital diagnostic monitoring interface, allowing for real-time access to device operating parameters. This module is hot-pluggable.
• Supports up to 25.7813 Gb/s bit rates
• Up to 70 m transmission distance on OM3
• Up to 100 m transmission distance on OM4
• VSCEL laser and PIN receiver
• Metal enclosure, for lower EMI
• 2-wire interface with integrated Digital Diagnostic monitoring
• Hot-pluggable SFP+ footprint
• Specifications compliant with SFF 8431 and SFF 8472
• Compliant with SFP+ MSA with LC connector
• Single 3.3 V power supply
Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes |
Storage Temperature | Ts | ‑40 | ‑ | 85 | °C | 1 |
Operating Temperature | TOP | 0 | ‑ | 70 | °C | |
Relative Humidity | RH | 0 | ‑ | 85 | % | 2 |
Power Supply Voltage | VCC | ‑0.5 | ‑ | 3.6 | V |
Notes:
1. Limited by the fiber cable jacket, not the active ends.
2. Non‑condensing.
Optical Characteristics (TOP = 0 °C to +70 °C, VCC = 3.3 V ± 5 %)
Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes |
Transmitter | ||||||
Center Wavelength | λC | 840 | 850 | 860 | nm | |
Side Mode Suppression Ratio | SMSR | 30 | dB | |||
Spectral Width | Pm | 1 | nm | |||
Average Output Power | Pavg | ‑8.4 | 2.4 | dBm | ||
Optical Modulation Amplitude (OMA) | POMA | ‑6.4 | 3 | dBm | ||
Extinction Ratio | ER | 2 | dB | |||
Transmitter Dispersion Penalty | TDEC | 4.3 | dB | |||
Optical Return Loss Tolerance | TOL | 20 | dB | |||
Transmitter OFF Output Power | POFF | ‑30 | dBm | |||
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}, Hit ratio 1.5E‑3 | {0.3, 0.38, 0.45, 0.35, 0.41, 0.5} | |||||
Receiver | ||||||
Center Wavelength | λc | 840 | 850 | 860 | nm | |
Receiver Stress Sensitivity, OMA | ‑5.2 | dBm | ||||
Receiver Sensitivity, Average Power | ‑10.3 | dBm | ||||
Receiver Reflectance | Rfl | ‑26 | dBm | |||
Loss of Signal Assert | PA | ‑30 | dBm | |||
Loss of Signal De‑assert | PD | ‑13 | dBm | |||
LOS Hysteresis | PD‑ PA | 0.5 | dB | dB |
Electrical Characteristics (TOP = 0 °C to +70 °C, VCC = 3.3 V ± 5 %)
Parameter | Symbol | Min | Typ | Max | Unit | Notes |
Supply Voltage | VCC | 3.135 | 3.3 | 3.465 | V | |
Supply Current | ICC | 300 | mA | |||
Transmitter | ||||||
Input Differential Impedance | Rin | 100 | Ω | 1 | ||
Differential Data Input Swing | Vin, pp | 100 | 800 | mV | ||
Transmit Disable Voltage | VD | 2 | VCC | V | ||
Transmit Enable Voltage | VEN | Vee | Vee+0.8 | V | ||
Receiver | ||||||
Differential Data Output Swing | Vout, pp | 100 | 400 | mV | 2 | |
LOS Fault | VLOS_fault | 2 | VccHOST | V | 3 | |
LOS Normal | VLOS_norm | Vee | Vee+0.8 | V | 3 | |
Power Supply Noise Tolerance | VCCT/VCCR | Per SFF‑8431 Rev 4.1 | 4 |
Notes:
1. Connected directly to TX data input pins. AC coupled thereafter.
2. Into 100 Ω differential termination.
3. LOS is an open collector output. Should be pulled up with 4.7 kΩ to 10 kΩ on the host board. Normal operation is logic 0; loss of signal is logic 1. Maximum pull‑up voltage is 5.5V.
4. Testing methodology per SFF‑8431. Rev 4.1.
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