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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Laser Drivers

Texas Instruments ONET8501VRGPR

Name: ONET8501VRGPR
Brand: Texas Instruments
SKU: ONET8501VRGPR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ONET8501VRGPR

Manufacturer:: Texas Instruments

Category:: Laser Drivers

Package:: 20-VFQFN Exposed Pad

Datasheet:: ONET8501VRGPR.pdf

Description:: IC LASER DRVR 11.3GB 3.6V 20QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ONET8501VRGPR from Texas Instruments is a 11.3 Gbps differential VCSEL driver IC designed for direct modulation of vertical-cavity surface-emitting lasers in optical transceivers. It operates from a single 3.3V supply, supports digital control of modulation current up to 24 mA and bias current up to 20 mA, and features integrated automatic power control (APC), output waveform shaping, and programmable input equalization for FR4 PCB traces up to 300 mm.

For engineers reviewing the ONET8501VRGPR datasheet, ONET8501VRGPR pinout, ONET8501VRGPR application, or ONET8501VRGPR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 20-pin QFN package mapping, confirmed laser safety and TMS compliance, and two rigorously cross-checked alternative drivers for 10G/FC/SFP+ optical transmitter designs.

Technical Context

The ONET8501VRGPR implements a dual-path high-speed output driver with independent over- and undershoot peaking control (OSW/USH registers) and cross-point adjustment (CPADJ/CPSGN), enabling precise optical eye diagram optimization at 11.3 Gbps. Its 2-wire I²C-compatible interface controls 14 registers-including EQADJ[0..7], MODC[0..7], BIASC[0..7], and APC-related bits-supporting closed-loop bias control via photodiode current monitoring with three selectable PDRNG ranges.

It integrates analog functions including a 1.16 V bandgap reference (BGV), temperature sensor (TS) with programmable offset/slope calibration, analog photodiode input (PD), and bias/monitor outputs (BIAS, MONB, MONP) with defined replica ratios (3.5% for bias, 27–270% for photodiode). The device uses on-chip 100 Ω differential termination at DIN+/DIN− and 50 Ω back-termination at MOD+/MOD−, with DC offset cancellation and polarity selection (POL bit).

Key Specifications

Parameter	Value and Actual Design Meaning
Data rate	Up to 11.3 Gbps - supports 10 Gigabit Ethernet, 8x/10x Fibre Channel, and SONET OC-192/SDH STM-64 line rates.
Modulation current	Up to 24 mA differential - digitally adjustable in 50 μA or 100 μA steps; enables precise VCSEL extinction ratio tuning.
Bias current	Up to 20 mA - programmable in open- or closed-loop mode with APC; MONB provides 3.5% replica for external fault detection.
Supply voltage	3.3 V ±10% - single-rail operation simplifies power delivery; VCC-RST threshold at 2.5 V ensures reliable power-on reset.
Input equalization	Programmable up to 300 mm FR4 trace - EQENA + EQADJ[0..7] compensates channel loss without external components.
Output jitter	≤9 ps_p-p deterministic jitter at 11.3 Gbps - low DJ enables compliant optical eye opening per IEEE 802.3ae and FC-PI-4.
Operating temperature	–40°C to +85°C - qualified for industrial and telecom module environments; TS pin provides calibrated die temperature sensing.

Pinout & Package

ONET8501VRGPR is housed in a RoHS-compliant 4 mm × 4 mm, 20-pin QFN package with 0.5 mm pitch and exposed thermal pad (EP) tied to GND. The package supports high-density SFP+ and XFP module layouts and provides low-inductance grounding via pins 6, 9, and EP.

Pin/Terminal	Circuit Role	Design Meaning
1 DIS	Digital disable input	Active-high shutdown of bias/modulation/peaking; toggling resets fault conditions; tie to GND if unused.
2 RZTC	Analog reference terminal	Connects external 28.7 kΩ zero-TC resistor to GND to generate precision DAC reference current.
3 TS	Analog temperature sensor output	Provides calibrated voltage (0.5–2.5 V) proportional to junction temperature; adjustable offset/slope via registers.
4 SCK	I²C clock input	2-wire serial interface clock with internal 500 kΩ pull-up; supports ≤400 kHz operation per I²C standard.
5 SDA	I²C data input/output	Open-drain bidirectional data line with internal 500 kΩ pull-up; enables register read/write for full configuration.
6, 9, EP GND	Ground reference	Primary signal and thermal ground; exposed pad must be soldered to PCB ground plane for thermal and EMI performance.
7 DIN+	Differential data input (+)	AC-coupled, on-chip 100 Ω terminated; accepts 100–1200 mV_pp swing; supports <55 ps rise/fall times.
8 DIN−	Differential data input (−)	Complementary to DIN+; forms fully differential input pair with common-mode rejection for noise immunity.
10 FLT	Fault flag output	LVCMOS digital output asserting high on MONB overvoltage, APC fault, or thermal error; sink/source capable.
11 BGV	Bandgap voltage reference	1.16 V buffered output; matches RZTC reference for DAC matching; use same resistor value as at RZTC.
12 MONB	Bias current monitor	Sources 3.5% replica of IBIAS; external resistor sets fault threshold (e.g., 1.16 V max at MONB triggers FLT).
13 MONP	Photodiode current monitor	Sources 27%/54%/270% replica of IPD depending on PDRNG setting; enables closed-loop APC with external op-amp.
14 COMP	APC loop compensation	Connect 0.01 μF capacitor to GND to set τ_APC ≈ 200 μs; stabilizes feedback loop for photodiode-based bias control.
15 PD	Photodiode input	Analog input sourcing/sinking photodiode current; polarity configurable via PDPOL bit for common-anode/cathode lasers.
16 BIAS	Laser bias current sink	Sinks average VCSEL bias current; connect to laser cathode via recommended BLM15HG102SN1D inductor.
17, 20 VCC	Power supply	3.3 V ±10% main supply; dual pins reduce IR drop and improve PSRR; decoupling required near each pin.
18 MOD−	Inverted modulation output	CML output with on-chip 50 Ω back-termination to VCC; sinks IMOD when data is low; differential pair with MOD+.
19 MOD+	Non-inverted modulation output	CML output with on-chip 50 Ω back-termination to VCC; sinks IMOD when data is high; enables polarity selection.

Key Features

Feature	Design Value
Digitally programmable output waveform shaping	Independent control of overshoot/undershoot width (30–120 ps) and height (0.33–10 mA) optimizes optical rise/fall edges and eye opening.
Integrated automatic power control (APC) loop	Uses MONP and PD inputs with COMP compensation to maintain stable VCSEL output power across temperature and aging.
Programmable input equalizer	EQADJ[0..7] adjusts equalization gain to compensate for up to 300 mm FR4 microstrip/stripline loss, reducing inter-symbol interference.
Laser safety and fault management	FLT pin asserts on MONB overvoltage, APC fault, or thermal error; DIS pin enables fast disable (<5 μs tOFF) and reset capability.
Calibrated on-die temperature sensor	TS output supports ±4°C accuracy after mid-scale calibration; TSSH/TSSL registers allow per-unit slope/offset trimming for system-level compensation.

Applications

10 Gigabit Ethernet Optical Transmitters	8x/10x Fibre Channel Optical Transmitters
Use Scenario: SFP+ modules for data center switch interconnects operating at 10.3125 Gbps. IC Role / Device Role / Timing Role: Directly modulates 850 nm VCSELs with precise bias and modulation current control; provides APC stability and waveform shaping for IEEE 802.3ae compliance. Use Value: Enables >300 m reach over multimode fiber with guaranteed optical eye mask margin and low DJ (<9 ps_p-p).	Use Scenario: XFP transceivers in storage area networks supporting 8.5 Gbps or 10.52 Gbps Fibre Channel protocols. IC Role / Device Role / Timing Role: Laser driver with TMS support and programmable equalization for legacy FC-PI-4 and FC-PI-5 interfaces. Use Value: Eliminates need for external equalizers or discrete bias control circuits, reducing BOM count and layout area by >30%.
SONET OC-192/SDH STM-64 Transmitters	SFP+, XFP, and XENPAK Transceiver Modules
Use Scenario: Telecom line cards requiring SONET OC-192 (9.953 Gbps) or SDH STM-64 transmission with strict jitter limits. IC Role / Device Role / Timing Role: High-fidelity VCSEL driver with deterministic jitter ≤9 ps_p-p and random jitter ≤0.6 ps_RMS meeting GR-253-CORE requirements. Use Value: Meets SONET jitter generation (TDEV) and mask compliance without post-layout retuning or external jitter cleaners.	Use Scenario: Multi-source agreement (MSA) compliant pluggable optics used across enterprise, telecom, and HPC systems. IC Role / Device Role / Timing Role: Fully integrated driver with 2-wire interface, laser safety features, and TMS register map alignment for MSA firmware compatibility. Use Value: Reduces qualification time by supporting standardized register access and fault reporting per SFF-8472 Rev 10.2.

10 Gigabit Ethernet Optical Transmitters

8x/10x Fibre Channel Optical Transmitters

Use Scenario: SFP+ modules for data center switch interconnects operating at 10.3125 Gbps.

IC Role / Device Role / Timing Role: Directly modulates 850 nm VCSELs with precise bias and modulation current control; provides APC stability and waveform shaping for IEEE 802.3ae compliance.

Use Value: Enables >300 m reach over multimode fiber with guaranteed optical eye mask margin and low DJ (<9 ps_p-p).

Use Scenario: XFP transceivers in storage area networks supporting 8.5 Gbps or 10.52 Gbps Fibre Channel protocols.

IC Role / Device Role / Timing Role: Laser driver with TMS support and programmable equalization for legacy FC-PI-4 and FC-PI-5 interfaces.

Use Value: Eliminates need for external equalizers or discrete bias control circuits, reducing BOM count and layout area by >30%.

SONET OC-192/SDH STM-64 Transmitters

SFP+, XFP, and XENPAK Transceiver Modules

Use Scenario: Telecom line cards requiring SONET OC-192 (9.953 Gbps) or SDH STM-64 transmission with strict jitter limits.

IC Role / Device Role / Timing Role: High-fidelity VCSEL driver with deterministic jitter ≤9 ps_p-p and random jitter ≤0.6 ps_RMS meeting GR-253-CORE requirements.

Use Value: Meets SONET jitter generation (TDEV) and mask compliance without post-layout retuning or external jitter cleaners.

Use Scenario: Multi-source agreement (MSA) compliant pluggable optics used across enterprise, telecom, and HPC systems.

IC Role / Device Role / Timing Role: Fully integrated driver with 2-wire interface, laser safety features, and TMS register map alignment for MSA firmware compatibility.

Use Value: Reduces qualification time by supporting standardized register access and fault reporting per SFF-8472 Rev 10.2.

Equivalent & Alternatives

The following parts are listed as comparable options for similar VCSEL driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3736ETE+	10.7 Gbps max rate; fixed 3.3 V supply; no integrated equalizer; 16-pin TQFN vs. 20-pin QFN; lacks TS/COMP pins.	Targeted at cost-sensitive 10G Ethernet only; no FC or SONET characterization; limited waveform control (no OS/US height/width).	Choose MAX3736ETE+ only if design requires lower gate count, no equalization, and simplified register map - not for FC/SONET or FR4 trace compensation.
SY88315BLEY	11.3 Gbps rated; includes CDR; 3.3 V supply; 24-pin QFN; supports both VCSEL and FP/DFB lasers; no integrated APC loop.	Used in higher-end transponders needing clock recovery; requires external APC circuitry; broader laser compatibility but larger footprint.	Choose SY88315BLEY when CDR functionality is mandatory and external APC implementation is acceptable - not for compact SFP+ with integrated APC.

Compared with MAX3736ETE+ and SY88315BLEY, the ONET8501VRGPR uniquely combines 11.3 Gbps operation, integrated APC, programmable equalization, and full laser safety features in a 4×4 mm QFN - making it optimal for space-constrained, standards-compliant SFP+/XFP modules where closed-loop stability and FR4 channel loss compensation are critical.

Availability

ONET8501VRGPR is available at Aetrix Electronics and suitable for 10 Gigabit Ethernet optical transmitters, Fibre Channel modules, and SONET OC-192/SDH STM-64 systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production deployment.

Supply support for ONET8501VRGPR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with decades of optical communications IC expertise.

The ONET8501VRGPR belongs to TI's ONET family of high-speed laser drivers, engineered specifically for cost-effective, standards-compliant optical transceiver modules in datacom and telecom infrastructure.

FAQ

What is the maximum data rate supported by the ONET8501VRGPR?

The ONET8501VRGPR supports operation up to 11.3 Gbps, enabling compliance with 10 Gigabit Ethernet (10.3125 Gbps), 8x/10x Fibre Channel (8.5/10.52 Gbps), and SONET OC-192/SDH STM-64 (9.953 Gbps) standards. This maximum rate is validated under specified conditions including 100–1200 mV_pp differential input swing and proper output waveform shaping configuration.

Does the ONET8501VRGPR include automatic power control (APC) functionality?

Yes, the ONET8501VRGPR integrates a complete APC loop using its PD input, MONP photodiode current monitor, and COMP compensation pin. When configured in closed-loop mode (OLENA = 0), it dynamically adjusts bias current to maintain constant VCSEL optical output power across temperature and aging - a core requirement for SFP+ and XFP MSA compliance.

How is output waveform shaping implemented in the ONET8501VRGPR?

The ONET8501VRGPR implements independent digital control of overshoot and undershoot width (30–120 ps) and height (0.33–10 mA) via registers OSW/OSH/USW/USH. This allows precise tuning of rising/falling edge speeds and optical eye opening without external components - directly improving BER performance in high-loss FR4 channels.

What package type and pin count does the ONET8501VRGPR use?

The ONET8501VRGPR is packaged in a RoHS-compliant 4 mm × 4 mm, 20-pin QFN with 0.5 mm pitch and an exposed thermal pad. Pin assignments are fully documented in the TI datasheet SLLS837B, including dedicated terminals for DIN+/DIN−, MOD+/MOD−, BIAS, PD, MONB, MONP, and I²C interface signals.

Can the ONET8501VRGPR operate with a single 3.3V supply?

Yes, the ONET8501VRGPR operates from a single 3.3 V ±10% supply applied to pins 17 and 20 (VCC). It draws up to 100 mA under full waveform shaping and equalization conditions, and includes internal bandgap regulation (BGV = 1.16 V) and power-on reset circuitry for robust startup behavior.

ONET8501VRGPR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 20-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Laser Diode Driver (Fiber Optic)

Data Rate:: 11.3Gbps

Number of Channels:: 1

Voltage - Supply:: 2.95V ~ 3.6V

Current - Supply:: 90 mA

Current - Modulation:: 24mA

Current - Bias:: 20 mA

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Supplier Device Package:: 20-QFN (4x4)

Mounting Type:: Surface Mount

ONET8501VRGPR FAQ

1.How can I place an order for ONET8501VRGPR through Aetrix?

Please submit a Request for Quotation (RFQ) for ONET8501VRGPR 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 ONET8501VRGPR reliable?

The price and inventory of ONET8501VRGPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET8501VRGPR is usually 5 days.

3.What payment methods are accepted for ONET8501VRGPR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET8501VRGPR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ONET8501VRGPR?

ONET8501VRGPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ONET8501VRGPR 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 ONET8501VRGPR?

For technical support, including ONET8501VRGPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET8501VRGPR requirements.

6.How does Aetrix verify that ONET8501VRGPR is sourced from the original manufacturer or authorized distributors?

All ONET8501VRGPR 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 ONET8501VRGPR meets industry standards.

7.What is the process for return or replacement of ONET8501VRGPR?

All ONET8501VRGPR units undergo pre-shipment inspection (PSI). If there is an issue with ONET8501VRGPR, 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 ONET8501VRGPR part is unused and in its original packaging.

Return procedure for ONET8501VRGPR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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