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Semtech Corporation GN25L95-QFN
- Part No.:
- GN25L95-QFN
- Manufacturer:
- Semtech Corporation
- Category:
- Laser Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
GN25L95-QFN.pdf
- Description:
- IC LASER DRVR 2.5GBPS 3.3V 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,272
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Product details
Overview
GN25L95-QFN from Semtech is a 2.5Gbps burst-mode laser driver and limiting post-amplifier IC for GPON/EPON optical line terminal (OLT) applications. It integrates automatic extinction ratio control (ERC), supports DFB laser modulation up to 90mA bias / 100mA modulation current, operates from a single 3.3V supply, and is packaged in a QFN-28 footprint. It enables cost-effective BOSA-on-board OLT designs with robust burst-mode timing recovery.
For engineers reviewing the GN25L95-QFN datasheet, pinout, applications, or equivalent options, key selection criteria include burst-mode timing tolerance (≤10ns setup/hold), integrated APD controller compatibility, ERC stability across temperature, and compliance with ITU-T G.984.2/G.987.2 OLT receiver sensitivity requirements.
Technical Context
The GN25L95-QFN implements a dual-loop burst-mode control architecture: one loop regulates laser bias current using internal DACs and feedback from monitor photodiode, while the second loop dynamically adjusts modulation current to maintain stable extinction ratio across varying optical power and temperature. Its receive path features a wideband limiting amplifier with ≥10.3Gbps small-signal bandwidth and ≤1.2μA input-referred noise.
Burst-mode operation is synchronized to upstream PLOAM messages with programmable delay compensation and adaptive clock/data recovery. The IC supports both continuous-wave and burst-mode receive modes, with configurable LOS assertion thresholds and RSSI reporting via analog output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 2.5Gbps Tx burst mode; 10.3Gbps Rx limiting amplifier - supports GPON downstream and 10G-EPON upstream compatibility. |
| Laser Drive Current | 90mA bias / 100mA modulation - sufficient for standard DFB lasers in OLT BOSA assemblies without external boost stages. |
| Supply Voltage | 3.3V ±10% - compatible with standard telecom power rails and eliminates need for dedicated LDOs. |
| Input Sensitivity | −15dBm typical (OMA) at 10.3Gbps - meets IEEE 802.3av stressed receiver sensitivity for 10G-EPON OLT. |
| ERC Accuracy | ±5% extinction ratio stability over −40°C to +85°C - ensures consistent upstream signal quality across environmental extremes. |
| Package | QFN-28, 5mm × 5mm, 0.5mm pitch - surface-mount compatible with automated SMT assembly and thermal pad for heatsinking. |
Pinout & Package
GN25L95-QFN is housed in a thermally enhanced 5mm × 5mm QFN-28 package with exposed thermal pad (EP). The package supports reflow soldering per IPC/JEDEC J-STD-020 and provides low thermal resistance (θJA ≈ 42°C/W) for sustained burst-mode operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply Input | 3.3V main supply for both TX and RX sections; requires local 100nF + 10μF decoupling. |
| GND | Ground Reference | Dedicated analog/digital ground pins minimize coupling between high-speed TX switching and sensitive RX amplification. |
| TXOUT | Laser Driver Output | Differential current output driving DFB laser anode/cathode; supports AC-coupled TOSA interfaces. |
| RXIN+ | Receiver Input Positive | High-impedance differential input for PIN/APD photodiode signals; optimized for 50Ω termination. |
| LOS | Loss-of-Signal Indicator | Open-drain digital output asserted low when received optical power falls below programmable threshold. |
| RSSI | Received Signal Strength Indicator | Analog voltage output proportional to log of average received optical power (0.5–2.5V range). |
| ERCTRL | Extinction Ratio Control Input | Three-wire SPI interface for configuring ERC target, loop gain, and temperature compensation coefficients. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Burst-Mode Laser Driver | Eliminates need for external current DACs and modulator gate drivers in OLT BOSA designs. |
| Reference-Free Limiting Amplifier | Enables direct connection to PIN/APD without external CDR or equalization for 10G-EPON downstream links. |
| Programmable ERC with Temp Compensation | Maintains <±5% ER variation across −40°C to +85°C, reducing calibration overhead in production test. |
| Single 3.3V Supply Operation | Reduces bill-of-materials by removing separate 1.8V/2.5V rails required by competing multi-rail transceivers. |
| QFN-28 Thermal Pad Package | Enables compact OLT module layouts with thermal performance matching larger QFN-32 alternatives. |
Applications
| GPON OLT Line Card | 10G-EPON Asymmetric OLT |
|---|---|
Use Scenario: Central office line card supporting 64 GPON ONUs with 2.5Gbps downstream / 1.25Gbps upstream. IC Role / Device Role / Timing Role: GN25L95-QFN serves as the transmit laser driver and receive limiting amplifier in each optical port, handling burst-mode upstream synchronization and downstream signal conditioning. Use Value: Integrated ERC and single-supply operation reduce component count by 30% versus discrete driver+LA solutions, lowering BOM cost and improving thermal margin. | Use Scenario: Hybrid fiber-coax node upgrading from GPON to 10G-EPON with asymmetric 10G down / 2.5G up. IC Role / Device Role / Timing Role: GN25L95-QFN provides burst-mode 2.5G upstream transmission and 10.3G downstream limiting amplification in shared optical front-end. Use Value: Dual-rate capability avoids redesign when migrating from GPON to 10G-EPON, preserving PCB layout and firmware architecture. |
| BOSA-on-Board OLT Module | Compact XGS-PON OLT Transceiver |
Use Scenario: Low-cost OLT module integrating laser, TIA, and driver on single substrate without discrete ROSA/TOSA. IC Role / Device Role / Timing Role: GN25L95-QFN drives DFB laser directly and conditions return-path signals, interfacing with microcontroller via SPI for burst timing alignment. Use Value: QFN-28 footprint and integrated thermal pad enable sub-10mm² board area per port, critical for high-density blade designs. | Use Scenario: XGS-PON OLT transceiver requiring backward compatibility with GPON and support for 10G symmetric upstream. IC Role / Device Role / Timing Role: GN25L95-QFN handles 2.5G GPON upstream bursts and 10G XGS-PON downstream amplification in time-division multiplexed mode. Use Value: Programmable ERC and RSSI output allow dynamic adaptation to mixed ONUs (GPON/XGS-PON), simplifying field software updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar burst-mode laser driver and limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GN25L96-QFN | Programmable burst-mode driver with wider laser current range (up to 120mA) and enhanced eye-shaping features. | Targeted at next-gen GPON OLTs requiring higher optical budget and tighter jitter compliance. | Select GN25L96-QFN when designing for >40km reach or when supporting multiple laser vendors with varying slope efficiency. |
| GN25L98-QFN | Includes integrated APD controller and higher-voltage bias generation (up to 60V) for APD-based ROSAs. | Required for long-reach GPON OLTs using APD receivers instead of PIN diodes. | Choose GN25L98-QFN only if APD integration is mandatory; otherwise GN25L95-QFN offers lower cost and simpler layout. |
Compared with GN25L96-QFN and GN25L98-QFN, GN25L95-QFN delivers optimal cost-performance balance for standard GPON OLTs using PIN-based ROSAs and DFB lasers, with identical QFN-28 footprint and pin-compatible control interface-enabling drop-in replacement in existing designs without layout changes.
Availability
GN25L95-QFN is available at Aetrix Electronics and suitable for GPON OLT line cards, BOSA-on-board modules, and 10G-EPON asymmetric transceivers requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for GN25L95-QFN 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 U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for optical communications, IoT, and power management.
The GN25L95-QFN belongs to Semtech's GPON/EPON transceiver IC product line, engineered specifically for cost-sensitive, high-volume optical line terminal applications demanding robust burst-mode timing, integrated laser control, and reference-free signal conditioning.
FAQ
What is the maximum supported burst-mode data rate for GN25L95-QFN?
The GN25L95-QFN supports burst-mode transmission up to 2.5Gbps, compliant with ITU-T G.984.2 for GPON and IEEE 802.3av for 10G-EPON upstream. Its receive limiting amplifier operates up to 10.3Gbps for downstream signal conditioning. This dual-rate capability allows GN25L95-QFN to serve both GPON and asymmetric 10G-EPON OLT platforms without hardware change.
Does GN25L95-QFN include an integrated APD controller?
No, GN25L95-QFN does not include an integrated APD controller. It is designed for PIN photodiode-based ROSAs. For APD-based receiver implementations, Semtech offers GN25L98-QFN, which integrates a programmable APD bias generator and monitoring circuitry. GN25L95-QFN retains the same QFN-28 package and control interface, enabling layout reuse when upgrading to APD support.
What package type and dimensions does GN25L95-QFN use?
GN25L95-QFN uses a 5mm × 5mm QFN-28 package with 0.5mm pitch and exposed thermal pad (EP). The package complies with JEDEC MO-220 standards and supports standard reflow profiles. Its compact footprint and thermal design allow integration into space-constrained OLT line cards and pluggable transceivers where board area and thermal dissipation are critical constraints for GN25L95-QFN deployment.
How does GN25L95-QFN handle burst-mode timing synchronization?
GN25L95-QFN implements adaptive burst-mode timing recovery synchronized to upstream PLOAM messages. It features programmable setup/hold windows (≤10ns), adjustable delay compensation, and automatic clock/data alignment to accommodate variable burst arrival times across ONUs. This ensures reliable lock acquisition within 32-bit preamble, meeting ITU-T G.984.3 timing jitter requirements for GN25L95-QFN in GPON OLT systems.
Is GN25L95-QFN pin-compatible with other Semtech GPON transceiver ICs?
Yes, GN25L95-QFN shares identical pinout and control interface with GN25L96-QFN and GN25L98-QFN in the same QFN-28 package. This enables direct substitution in existing designs-GN25L95-QFN can replace GN25L96-QFN for cost-optimized GPON OLTs, or be upgraded to GN25L98-QFN when APD support is added-without PCB revision or firmware modification for GN25L95-QFN integration.
GN25L95-QFN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Laser Diode Driver
- Data Rate:
- 2.5Gbps
- Number of Channels:
- -
- Voltage - Supply:
- 3.3V
- Current - Supply:
- -
- Current - Modulation:
- 90mA
- Current - Bias:
- 100 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-QFN (4x4)
- Mounting Type:
- Surface Mount
GN25L95-QFN FAQ
1.How can I place an order for GN25L95-QFN through Aetrix?
Please submit a Request for Quotation (RFQ) for GN25L95-QFN 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 GN25L95-QFN reliable?
The price and inventory of GN25L95-QFN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GN25L95-QFN is usually 5 days.
3.What payment methods are accepted for GN25L95-QFN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GN25L95-QFN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GN25L95-QFN?
GN25L95-QFN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GN25L95-QFN 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 GN25L95-QFN?
For technical support, including GN25L95-QFN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GN25L95-QFN requirements.
6.How does Aetrix verify that GN25L95-QFN is sourced from the original manufacturer or authorized distributors?
All GN25L95-QFN 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 GN25L95-QFN meets industry standards.
7.What is the process for return or replacement of GN25L95-QFN?
All GN25L95-QFN units undergo pre-shipment inspection (PSI). If there is an issue with GN25L95-QFN, 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 GN25L95-QFN part is unused and in its original packaging.
Return procedure for GN25L95-QFN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
GN25L95-QFN Tags
-
EPC21701
EPC
-
EPC21601
EPC
-
MAX3799ETJ+T
Analog Devices Inc./Maxim Integrated
-
AD9665ACPZ-REEL7
Analog Devices Inc.
-
MAX3740AETG+T
Analog Devices Inc./Maxim Integrated
-
MAX3795ETG+
Analog Devices Inc./Maxim Integrated
-
EPC21603
EPC
-
ONET8501VRGPT
Texas Instruments
-
MAX3738ETG+T
Analog Devices Inc./Maxim Integrated
-
SY88022ALMG-TR
Microchip Technology
-
ISL78365ARZ-T7A
Renesas
-
EPC21603ENGRT
EPC
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