98X20251D0-BEJ2C000-A115 - 10G XAUI Transceiver | Marvell
MPN: 98X20251D0-BEJ2C000-A115 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $34.2 | $342.00 |
| 100 | $29.8 | $2,980.00 |
| 500 | $26.45 | $13,225.00 |
| 1,000 | $23.1 | $23,100.00 |
98X20251D0-BEJ2C000-A115 Overview
What is a multi-gigabit transceiver? A multi-gigabit transceiver (SerDes) is an integrated circuit that serializes parallel low-speed data into a single high-speed serial stream (and vice versa) while embedding clock-and-data recovery, equalization, and pre-emphasis. Transceivers sit at the physical layer (PHY) of the OSI model between the MAC/PCS layer and the optical or copper medium. They are sub-categorized as Ethernet PHYs, Fibre Channel transceivers, backplane SerDes, and chip-to-chip SerDes. The 98X20251 family is a 10GbE XAUI-to-SerDes transceiver with adaptive EDC, bridging the XAUI bus commonly used on 10GbE PHY/MAC ASICs to a single 10 Gbps serial lane used over fiber or copper.
Key features of the 98X20251D0-BEJ2C000-A115 include adaptive electronic dispersion compensation supporting multi-mode fiber spans beyond the 10GBASE-SR 300 m limit, integrated 10 Gbps CDR with reference-free operation, and XAUI-side 8b/10b-encoded receive and transmit interfaces. The device is intended for SFP+ form-factor modules and hot-pluggable 10 Gigabit Ethernet applications.
The 98X20251D0-BEJ2C000-A115 is used as a 10GBASE-LRM PHY inside SFP+ LR/MR modules where adaptive EDC compensates for chromatic and modal dispersion. Designers typically pair it with a host 10GbE MAC/PCS ASIC presenting an XAUI bus. Adaptive EDC eliminates the need for fixed pre-emphasis taps, simplifying firmware across multiple fiber grades.
Typical applications include 10GBASE-LRM SFP+ transceivers, 10 Gigabit Ethernet line cards, datacom switches, and rack-to-rack optical interconnects. Choose the 98X20251D0-BEJ2C000-A115 over alternative transceivers when the link budget includes multi-mode fiber above 300 m or installed-plant copper cabling with unknown frequency response.
Drop-in alternatives for 98X20251D0-BEJ2C000-A115 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with 98X20251D0-BEJ2C000-A115 (same form factor and footprint) — differing in Function.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
98X20251-BEJ2
✅ Drop-In📋 Reference alternative (not in catalog)
88X5113-A1-BVW4C000
✅ Drop-In✓ In Stock
$9.5 / Unit
View Datasheet →BCM8706
✅ Drop-In📋 Reference alternative (not in catalog)
BCM8727
✅ Drop-In📋 Reference alternative (not in catalog)
98DX2122B0-BIH2C000
✅ Drop-In📋 Reference alternative (not in catalog)
98X20251D0-BEJ2C000-A115 Specifications
| Function | Serial 10 Gbps-to-XAUI transceiver with adaptive EDC |
| Standard | 10GBASE-LRM / 10GBASE-R / XAUI |
| Serial Data Rate | 10.3125 Gbps |
| XAUI Lane Rate | 3.125 Gbps (4 lanes) |
| Interface - Serial Side | 1 x 10G differential serial (CML/SFI) |
| Interface - Parallel Side | 4 x 3.125 Gbps XAUI (8b/10b) |
| Electronic Dispersion Compensation | Adaptive EDC |
| Reference Clock | Reference-free CDR |
| Reach (Multi-Mode Fiber, with EDC) | Up to 220 m on OM1 / 300 m on OM3 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead Free | Yes |
| Halogen Free | unknown |
98X20251D0-BEJ2C000-A115 standard Pin Configuration Guide
Pin configuration for 98X20251D0-BEJ2C000-A115 (standard package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for 98X20251D0-BEJ2C000-A115.
Refer to the datasheet for full pin configuration.
Typical Applications
98X20251D0-BEJ2C000-A115 is suitable for 6 applications: 10GBASE-LRM SFP+ Optical Transceiver Module, 10 Gigabit Ethernet Line Card / Datacom Switch, Rack-to-Rack Optical Interconnect, 10G Fibre Channel Host Bus Adapter (SAN), Wireless Backhaul Equipment with 10G Uplink, Test & Measurement Equipment (10G Ethernet Tester).
10GBASE-LRM SFP+ Optical Transceiver Module
The 98X20251D0-BEJ2C000-A115 is the host-side PHY inside an SFP+ LR/MR module, converting the 4-lane XAUI bus from the module's GbE controller into a single 10.3125 Gbps serial lane that drives the TOSA and receives from the ROSA. Adaptive EDC extends the multi-mode fiber reach beyond the 10GBASE-SR 300 m limit by compensating modal dispersion on installed OM1 and OM2 plant. This part is the standard Marvell recommendation for SFP+ LRM optics shipping into enterprise datacom switches.
Recommended
10 Gigabit Ethernet Line Card / Datacom Switch
Inside a 10 GbE line card the 98X20251D0-BEJ2C000-A115 sits between the switch ASIC's XAUI bus and the front-panel SFP+ cage, providing adaptive EDC for ports that must auto-negotiate across multiple fiber grades and patch-panel losses. Reference-free CDR eliminates the need for an external 156.25 MHz oscillator, simplifying BOM. Distances of 220 m on OM1 and 300 m on OM3 are achievable when the host firmware enables EDC.
Recommended
Rack-to-Rack Optical Interconnect
Datacenter racks connect with 10G optical links where the 98X20251D0-BEJ2C000-A115 provides the PHY. The adaptive EDC engine automatically equalizes the frequency response of the patch cords and connectors in the link, eliminating the link-tuning step during commissioning. Combined with the reference-free CDR, the part is well suited to high-density top-of-rack switch designs with 24-48 SFP+ ports per chassis.
Recommended
10G Fibre Channel Host Bus Adapter (SAN)
Although marketed for 10GbE, the 98X20251D0-BEJ2C000-A115 also supports 10G Fibre Channel (10GFC) data rates and can be paired with a Fibre Channel controller presenting XAUI. SAN host bus adapters using this Marvell PHY deliver reliable 10GFC links over installed OM1/OM2 fiber plant, where standard 10GBASE-SR optics would fail. Adaptive EDC allows a single HBA SKU to qualify against multiple switch vendors' optics.
Recommended
Wireless Backhaul Equipment with 10G Uplink
Cellular baseband units and microwave backhaul radios often include a 10 GbE uplink to the core network; the 98X20251D0-BEJ2C000-A115 provides the SFP+ PHY on these uplinks. Adaptive EDC makes the link robust against the long fiber runs typical of tower-to-core backhaul, while the small surface-mount package preserves the compact PCB footprint required by outdoor enclosures. Industrial-grade temperature variants may be required for outdoor deployment.
Recommended
Test & Measurement Equipment (10G Ethernet Tester)
10G Ethernet BERTs and link testers use the 98X20251D0-BEJ2C000-A115 as the device-under-test interface, since its adaptive EDC engine stress-tests the most demanding 10GBASE-LRM link conditions. The reference-free CDR allows the tester to operate without injecting a separate reference clock. Engineers evaluating an unknown fiber plant use the part's adaptive equalizer to characterize residual dispersion on the link.
Recommended
Recommended Products Summary
Engineering reference data for 98X20251D0-BEJ2C000-A115 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 98X20251-BEJ2 | 88X5113-A1-BVW4C000 | BCM8706 | BCM8727 | 98DX2122B0-BIH2C000 |
|---|---|---|---|---|---|---|
| Brand | Marvell | Marvell | Marvell | Broadcom | Broadcom | Marvell |
| Package | Marvell QFN (SFP+ module footprint) | Same QFN (drop-in) | Similar QFN (drop-in SFP+ footprint) | Similar QFN (PCB review needed) | Similar QFN (PCB review needed) | Larger switch + transceiver package (PCB review needed) |
| Serial Data Rate | 10.3125 Gbps | 10.3125 Gbps | 1.25 Gbps | 10.3125 Gbps | 10.3125 Gbps | 10.3125 Gbps (integrated) |
| Host Interface | XAUI (4 x 3.125 Gbps) | XAUI (4 x 3.125 Gbps) | XAUI | XAUI | XAUI | XAUI + integrated switch |
| Adaptive EDC | Yes (10GBASE-LRM) | Yes | No (1G rate) | Yes | Yes | Yes |
| Reference Clock | Reference-free CDR | Reference-free CDR | Reference clock required | Reference-free CDR | Reference-free CDR | Reference-free CDR |
| Multi-Mode Fiber Reach (with EDC) | 220 m on OM1 / 300 m on OM3 | 220 m / 300 m | N/A (1G) | 220 m / 300 m | 220 m / 300 m | 220 m / 300 m |
| Target Module Form Factor | SFP+ | SFP+ | SFP | SFP+ | SFP+ | Line-card (not module) |
| Qty-1 Price (USD, as of 2026-10-06) | 38.50 | 36.00 | 12.50 | 32.00 | 35.00 | 85.00 |
Key Differentiators
- True 10 GbE XAUI-to-SerDes with adaptive EDC in a small SFP+ form factor (vs 88X5113-A1-BVW4C000)
- Reference-free CDR eliminates external 156.25 MHz oscillator BOM (vs BCM8706)
- Marvell Alaska family pin-and-register compatibility with 98X20251-BEJ2 (vs BCM8727)
- Standalone transceiver vs integrated switch + transceiver (vs 98DX2122B0-BIH2C000)
Design Notes
Route the 10 Gbps serial differential pair on the top layer with continuous reference ground beneath and an impedance of 100 ohm differential. Keep the pair length under 25 mm if possible and avoid any via stubs by using blind or back-drilled vias. The XAUI bus runs at 3.125 Gbps and tolerates longer routing but must still be length-matched within 150 mil (3.81 mm) across all four lanes to keep the XAUI eye mask compliant.
Estimated: the 98X20251D0-BEJ2C000-A115 typically draws approximately 1.0-1.4 W from its core supply at full 10 Gbps operation. Decouple each supply pin with a 0.1 uF X7R ceramic capacitor placed within 2 mm of the pin, plus a 10 uF bulk capacitor on the supply rail. Place a ferrite bead between the bulk capacitor and the IC to suppress switching noise from the upstream DC-DC converter.
Adaptive EDC requires a stable input signal-to-noise ratio; verify the upstream TOSA output eye passes the SFF-8431 jitter mask before the 98X20251D0-BEJ2C000-A115 takes over equalization. Use a high-bandwidth oscilloscope with a de-embedding fixture to probe the serial lane in module bring-up. Note: this is an SFP+ module design recommendation, not a datasheet parameter.
Do not assume the 98X20251D0-BEJ2C000-A115 will interoperate with all XAUI hosts. Some older XAUI PHYs do not implement the 10GBASE-LRM adaptive equalizer hand-shake and will report a link-down status. Always run interoperability testing against the targeted switch ASIC reference platform before committing to production. Note: this recommendation is based on general SFP+ PHY design experience and not on a specific Marvell datasheet clause.
Estimated: in a sealed SFP+ module, the 98X20251D0-BEJ2C000-A115 dissipates approximately 1.0-1.4 W at 70 C ambient. Place thermal vias under the exposed pad to pull heat into the SFP+ cage body, which acts as a heatsink. Keep the bulk capacitor bank away from the IC's exposed pad to avoid trapping heat under the package. Note: this is an estimate based on typical SFP+ thermal design rules, not a manufacturer figure.
Compliance Information
RoHS compliant and lead-free per Marvell product family declarations. REACH, halogen-free and conflict-minerals status not exposed in public distributor listings; confirm against Marvell material declaration for production qualification. AEC-Q100 not applicable for a commercial-grade 10G transceiver.
