ONET4291VARGPTG4 Texas Instruments Integrated Circuit (Other) In Stock
Texas Instruments ONET4291VARGPTG4 is a multi-rate VCSEL driver IC supporting line rates from 1 Gbps to 4.25 Gbps for optical transceiver modules in a 20-pin VQFN package with exposed thermal pad. It provides programmable modulation and bias current control for VCSEL laser diodes used in Gigabit Ethernet, Fibre Channel, and SONET/SDH applications. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- ONET4291VARGPTG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Multi-rate operation from 1 Gbps to 4.25 Gbps supporting Gigabit Ethernet, 4G Fibre Channel, and SONET OC-48 in a single IC
- Programmable modulation current and bias current via 2-wire serial interface enabling precise VCSEL operating point control
- Compact 20-pin VQFN package with exposed thermal slug for efficient heat dissipation in high-density optical transceiver modules
Applications
The ONET4291VARGPTG4 drives VCSEL laser diodes in SFP, SFP+, and GBIC optical transceiver modules used in enterprise Gigabit Ethernet switches, storage area network (SAN) Fibre Channel links, and SONET/SDH metro aggregation equipment. Its 1 Gbps to 4.25 Gbps multi-rate capability enables a single transceiver design to target multiple market segments, reducing SKU proliferation in optical module manufacturing. The integrated automatic power control loop maintains stable VCSEL output power over temperature and aging, extending module operational lifetime.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Interface IC Type | INTERFACE CIRCUIT |
| JESD-30 Code | S-PQCC-N20 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC20,.16SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Voltage-Max | 3.6V |
| Supply Voltage-Min | 2.9V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| HTS Code | 8542.39.00.01 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ONET4291VARGPTG4:
Frequently Asked Questions
What data rate range does the ONET4291VARGPTG4 support and which optical standards does it cover?
The ONET4291VARGPTG4 supports multi-rate operation from 1 Gbps to 4.25 Gbps, covering Gigabit Ethernet (1.25 Gbps), 2G and 4G Fibre Channel (2.125 Gbps and 4.25 Gbps), and SONET OC-48 (2.488 Gbps). This multi-rate flexibility allows a single IC and reference design to address multiple product SKUs in optical transceiver manufacturing, reducing design and inventory costs.
How does the ONET4291VARGPTG4's programmable bias and modulation current control benefit VCSEL module calibration during production?
The device allows modulation current adjustment from approximately 0 mA to 20 mA and bias current from 0 mA to 25 mA via a 2-wire serial interface, enabling each transceiver module to be individually calibrated to the VCSEL's specific threshold and efficiency curve during factory test. This eliminates the need for laser-trimmed external resistors and reduces calibration time to under 100 ms per module, which is critical for high-volume SFP production lines targeting throughput rates above 500 units per hour.
For a 4G Fibre Channel SFP module design, what thermal considerations apply to the ONET4291VARGPTG4's VQFN package?
At 4.25 Gbps modulation, the ONET4291VARGPTG4 dissipates approximately 200 mW to 300 mW depending on VCSEL drive current. The 20-pin VQFN exposed thermal pad presents a junction-to-board thermal resistance of roughly 30°C/W, so with a PCB copper pour of at least 100 mm² connected to the pad, junction temperature remains below 85°C at a 70°C ambient — within the IC's rated operating range. Proper via stitching under the thermal pad to inner copper layers is recommended to meet SFP module thermal specifications.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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