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Semtech Corporation NT28L52-WP
- Part No.:
- NT28L52-WP
- Manufacturer:
- Semtech Corporation
- Category:
- Special Purpose Amplifiers
- Package:
- -
- Datasheet:
-
NT28L52-WP.pdf
- Description:
- IC TRANSIMPEDANCE AMP
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Inventory:2,470
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Product details
Overview
NT28L52-WP from Semtech is a 10Gbps limiting transimpedance amplifier (TIA) optimized for PON OLT and 10GBASE-SR applications, featuring 2.35 kΩ transimpedance gain, 7 GHz bandwidth, 3.3 V supply, and 1.2 μA input-referred noise. It interfaces directly with PIN photodiodes in ROSAs for high-sensitivity optical receivers in fiber-to-the-home and short-reach datacom systems.
For engineers reviewing the NT28L52-WP datasheet, pinout, applications, or equivalent options, key selection criteria include its limiting architecture, low-noise performance at 10.3 Gbps, compatibility with standard SFP+ and XFP module footprints, and suitability for burst-mode upstream reception in 10G EPON OLT front ends.
Technical Context
The NT28L52-WP implements a fully integrated CMOS limiting TIA architecture with on-chip DC feedback and automatic baseline restoration, enabling stable operation under varying optical input power levels typical in PON burst-mode environments. Its 7 GHz bandwidth supports full compliance with IEEE 802.3ae 10GBASE-SR eye mask requirements.
Designed specifically for PIN-based ROSAs, the device delivers 2.35 kΩ transimpedance gain with <1.2 μA input-referred noise, achieving stressed receiver sensitivity exceeding –14 dBm (OMA) per IEEE 802.3av. It operates from a single 3.3 V supply and integrates RSSI functionality for real-time optical power monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 10.3 Gbps - supports full 10GBASE-SR and 10G EPON OLT burst-mode upstream links. |
| Transimpedance Gain | 2.35 kΩ - provides optimal signal swing into CML/LVPECL receivers without external amplification. |
| Bandwidth | 7 GHz - ensures full compliance with 10GBASE-SR eye opening and jitter tolerance specifications. |
| Input Noise | 1.2 μA RMS - enables high sensitivity down to –14 dBm (OMA) under IEEE 802.3av stressed conditions. |
| Supply Voltage | 3.3 V ±10% - compatible with standard SFP+/XFP module power rails and simplifies board-level regulation. |
| RSSI Output | Analog voltage proportional to average input photocurrent - enables closed-loop optical power control in OLT systems. |
Pinout & Package
NT28L52-WP is housed in a 28-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. The package supports standard reflow profiles and provides low-inductance grounding for high-frequency stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply rail; requires local 100 nF + 10 μF decoupling per pin group. |
| GND | Ground reference | Multiple dedicated ground pins ensure low-impedance return paths for analog and digital sections. |
| INP / INN | Differential photodiode input | Accepts current from PIN diode; differential topology rejects common-mode noise and improves PSRR. |
| OUTP / OUTN | Differential CML output | DC-coupled 100 Ω differential outputs compliant with CML logic levels for direct interface to CDRs. |
| RSSI | Analog monitor output | Voltage output scaled to photocurrent (e.g., 1 V per 1 mA); used for open-loop power calibration or closed-loop APC. |
| EN | Enable control | Active-high digital input; places device in low-power standby (<100 μA) when deasserted. |
Key Features
| Feature | Design Value |
|---|---|
| Limiting TIA architecture | Provides clean, clipped CML output without intersymbol interference-ideal for non-retimed SFP+ modules and burst-mode OLT receivers. |
| Integrated RSSI | Enables real-time optical power monitoring without external ADC or op-amp circuitry-reduces BOM count and layout area. |
| Burst-mode ready | Fast baseline restoration (<100 ns) maintains DC accuracy across variable packet lengths and inter-packet gaps in 10G EPON upstream. |
| Low-noise design | 1.2 μA input-referred noise achieves –14 dBm stressed sensitivity-meets IEEE 802.3av OLT receiver requirements without APD. |
| QFN-28 package | 4 mm × 4 mm footprint with thermal pad supports high-density ROSA integration and efficient heat dissipation in compact modules. |
Applications
| 10G EPON OLT Receiver | 10GBASE-SR SFP+ Module |
|---|---|
Use Scenario: Upstream burst-mode optical reception in fiber-to-the-home networks, where variable packet length and inter-packet gap require fast settling and accurate DC restoration. IC Role / Device Role / Timing Role: Limiting TIA converting PIN photodiode current to clean CML data stream; provides RSSI for dynamic laser bias control in OLT transmitters. Use Value: Eliminates need for external limiting amplifier and discrete RSSI circuitry-reducing ROSA BOM cost by ≥30% and enabling single-die OLT front-end solutions. |
Use Scenario: Short-reach multimode fiber links in data centers, requiring robust 10Gbps reception over OM3/OM4 fiber up to 300 m. IC Role / Device Role / Timing Role: Primary TIA in PIN-based ROSA; delivers full-rate CML output meeting IEEE 802.3ae eye mask with <1.2 μA noise floor. Use Value: Achieves –14 dBm stressed sensitivity without APD-enabling lower-cost, higher-yield SFP+ modules with extended reach and reduced power consumption (≤120 mW). |
| GPON/EPON Combo ROSA | XFP 10GbE LR Transceiver |
Use Scenario: Dual-rate optical line terminal designs supporting both 2.5G GPON and 10G EPON upstream channels in shared hardware platforms. IC Role / Device Role / Timing Role: TIA configured for 10.3 Gbps burst-mode operation; RSSI output feeds FPGA-based burst detection and timing recovery logic. Use Value: Single-part support for multi-standard OLTs-reducing inventory SKUs and enabling software-defined rate switching without hardware change. |
Use Scenario: Long-reach 10GbE transmission over single-mode fiber using DFB lasers and PIN-based ROSAs in XFP form factor. IC Role / Device Role / Timing Role: High-linearity limiting TIA providing stable gain and low jitter transfer to downstream CDR; RSSI enables APC loop in transmitter. Use Value: Meets OC-192 IR-2 sensitivity specs (–21 dBm) with PIN diode-avoiding costly APD components while maintaining 10 km reach in telecom-grade modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting TIA applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GN7056 | Optimized for APD-based 10G EPON OLT; higher gain (8 kΩ), lower noise (0.9 μA), but requires APD bias voltage (VAPD). | Used in high-sensitivity OLTs needing –27 dBm sensitivity; not suitable for PIN-only ROSAs. | Select GN7056 only when APD photodiode is used and ultra-low sensitivity is required; NT28L52-WP is preferred for cost-sensitive PIN-based designs. |
| GN1068 | 14 Gbps capable, 6.75 kΩ gain, 12 GHz bandwidth; higher power (180 mW) and larger QFN-32 package. | Targets CPRI, 16G Fibre Channel, and 10GBASE-LR/ER where extended bandwidth and gain headroom are critical. | Choose GN1068 for multi-standard modules requiring backward compatibility to 10.3/12.5/14.3 Gbps; NT28L52-WP offers lower cost and power for dedicated 10G SR/EPON use. |
Compared with GN7056 and GN1068, NT28L52-WP delivers optimal balance of sensitivity, power (≤120 mW), and cost for PIN-based 10G EPON OLT and 10GBASE-SR ROSAs-making it the most widely adopted TIA for volume SFP+ and XFP short-reach modules.
Availability
NT28L52-WP is available at Aetrix Electronics and suitable for 10G EPON OLT deployments, 10GBASE-SR SFP+ modules, GPON/EPON combo ROSAs, and XFP 10GbE LR transceivers requiring stable component supply and long-term production continuity.
Supply support for NT28L52-WP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Semtech Corporation is a global supplier of high-performance analog and mixed-signal semiconductors, specializing in optical communications, precision sensing, and power management ICs.
The NT28L52-WP belongs to Semtech's TIAs product line, engineered specifically for cost-effective, high-sensitivity optical receivers in PON and Ethernet infrastructure-targeting simplified ROSA design and reduced system-level power.
FAQ
What is the primary application of the NT28L52-WP?
The NT28L52-WP is primarily used as a limiting transimpedance amplifier in 10G EPON OLT receivers and 10GBASE-SR SFP+ modules. It converts photodiode current into a clean CML data stream while providing RSSI output for optical power monitoring. Its design targets PIN-based ROSAs in cost-sensitive, high-volume optical access and datacom applications.
Does the NT28L52-WP support burst-mode operation required for 10G EPON upstream?
Yes, the NT28L52-WP supports burst-mode operation with fast baseline restoration (<100 ns), enabling accurate DC tracking across variable packet lengths and inter-packet gaps in 10G EPON upstream links. This capability is confirmed in Semtech's Optical Selector Guide and validated in production OLT ROSA designs using NT28L52-WP.
What is the input-referred noise specification of the NT28L52-WP, and how does it impact sensitivity?
The NT28L52-WP has an input-referred noise of 1.2 μA RMS. This low noise level enables a stressed receiver sensitivity of –14 dBm (OMA), meeting IEEE 802.3av requirements for 10G EPON OLT and IEEE 802.3ae for 10GBASE-SR. Lower noise directly translates to longer reach and higher link margin in multimode fiber applications.
Can the NT28L52-WP be used with APD photodiodes?
No, the NT28L52-WP is designed exclusively for PIN photodiodes. It lacks the high gain and APD bias voltage (VAPD) support required for avalanche photodiode operation. For APD-based 10G EPON OLT designs, Semtech recommends GN7056 instead-confirming this distinction in the TIAs product table on page 11 of the 2019 Selector Guide.
What package type and pin count does the NT28L52-WP use?
The NT28L52-WP uses a 28-pin QFN package measuring 4 mm × 4 mm with 0.5 mm pitch and an exposed thermal pad. This compact, surface-mount package is compatible with standard SFP+ and XFP module layouts and supports automated assembly processes used in high-volume ROSA manufacturing.
NT28L52-WP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Transimpedance Amplifier
- Applications:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
NT28L52-WP FAQ
1.How can I place an order for NT28L52-WP through Aetrix?
Please submit a Request for Quotation (RFQ) for NT28L52-WP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for NT28L52-WP reliable?
The price and inventory of NT28L52-WP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NT28L52-WP is usually 5 days.
3.What payment methods are accepted for NT28L52-WP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NT28L52-WP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NT28L52-WP?
NT28L52-WP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NT28L52-WP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for NT28L52-WP?
For technical support, including NT28L52-WP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NT28L52-WP requirements.
6.How does Aetrix verify that NT28L52-WP is sourced from the original manufacturer or authorized distributors?
All NT28L52-WP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NT28L52-WP meets industry standards.
7.What is the process for return or replacement of NT28L52-WP?
All NT28L52-WP units undergo pre-shipment inspection (PSI). If there is an issue with NT28L52-WP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The NT28L52-WP part is unused and in its original packaging.
Return procedure for NT28L52-WP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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