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Texas Instruments ONET8501TY
- Part No.:
- ONET8501TY
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
ONET8501TY.pdf
- Description:
- IC TRANSIMPEDANCE 1 CIRC DIESALE
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
ONET8501TY from Texas Instruments is a 11.3 Gbps limiting transimpedance amplifier (TIA) for optical receivers, featuring 10 GHz bandwidth, 7 kΩ differential small-signal transimpedance, and integrated RSSI. It operates from a single 3.3 V supply, dissipates 100 mW typical power, and is optimized for TO-can packaging with die form delivery.
For engineers reviewing the ONET8501TY datasheet, ONET8501TY pinout, ONET8501TY application, or ONET8501TY equivalent, key selection criteria include its 2.5 mAPP input overload current, CML differential outputs with on-chip 50 Ω back-termination, on-die supply filtering, and dual RSSI outputs (RSSI_IB/RSSI_EB) for PIN/APD bias configurations.
Technical Context
The ONET8501TY implements a three-stage signal path: transimpedance amplifier (TIA) with AGC, voltage-limiting amplifier, and CML output buffer with internal 50 Ω pull-up to VCC_OUT. Its TIA stage uses dc input bias cancellation and automatic gain control to maintain stable limiting behavior across 16 μAPP–2.5 mAPP input current range.
Two independent supply domains-VCC_IN for TIA and VCC_OUT for voltage/CML stages-are decoupled on-die. The FILTER1/FILTER2 pins provide photodiode bias via an internal 220 Ω resistor and on-chip capacitor, enabling low-noise operation below 5 MHz corner frequency without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal transimpedance | 7 kΩ typical - sets gain scaling between photodiode current and differential voltage output |
| Small-signal bandwidth | 10 GHz - supports 10.3125 Gbps data rates (e.g., 10G Ethernet, OC-192) with minimal high-frequency loss |
| Input overload current | 2.5 mAPP - defines maximum tolerable photodiode current before AGC saturation or distortion |
| RSSI output type | Current-mode (RSSI_IB/RSSI_EB) - enables programmable signal strength monitoring via external load resistor |
| Power dissipation | 100 mW typical at 3.3 V - enables thermal management in compact TO-can modules without active cooling |
| Operating temperature | –40°C to +100°C case - qualified for industrial and telecom optical module environments |
| Differential output impedance | 50 Ω on-chip back-termination - eliminates need for external termination resistors on OUT+/OUT– lines |
Pinout & Package
ONET8501TY is supplied as a bare die (DIESALE package) measuring 940 × 1195 μm with 19 bond pads. It is designed for integration into TO-46 or similar hermetic optical receiver cans, requiring wire bonding and external photodiode mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Analog input | Photodiode anode connection to TIA input; requires low-parasitic layout due to 10 GHz bandwidth sensitivity |
| OUT+, OUT– | Analog outputs | Differential CML data outputs with internal 50 Ω pull-up to VCC_OUT; require AC coupling (e.g., 0.1 μF) |
| RSSI_IB, RSSI_EB | Analog outputs | Current-mode RSSI outputs: RSSI_IB for internal PD bias, RSSI_EB for external APD/PIN bias; both require external load resistor to GND |
| VCC_IN, VCC_OUT | Supply inputs | Separate 3.3 V supplies: VCC_IN powers TIA stage only; VCC_OUT powers voltage amplifier and CML buffer |
| FILTER1, FILTER2 | Analog bias | Provide filtered 3.3 V bias to photodiode cathode via internal 220 Ω resistor and on-die capacitor |
| GND (pins 4,8,13–19) | Supply ground | All 10 GND pads are internally connected; full bonding recommended for optimal RF grounding and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| On-die supply filtering | Integrated capacitors on VCC_IN/VCC_OUT eliminate need for external bulk bypass capacitors in space-constrained TO cans |
| Dual RSSI architecture | Separate RSSI_IB (for internal PD bias) and RSSI_EB (for external bias) enable accurate signal strength monitoring across PIN and APD receiver topologies |
| AGC with DC offset cancellation | Internal low-pass filters cancel photodiode dark current and adjust TIA gain dynamically to maintain limiting performance over wide input current range |
| CML outputs with on-chip termination | 50 Ω back-termination reduces PCB trace complexity and improves signal integrity at 10+ Gbps without external resistors |
| Optimized for TO-can integration | Die size (940 × 1195 μm), pad layout, and thermal profile match standard 5-pin TO-46 mechanical constraints and thermal dissipation requirements |
Applications
| SFP+ Optical Receivers | 10G Ethernet Receivers |
|---|---|
Use Scenario: High-density pluggable transceivers operating at 10.3125 Gbps in data center switches and routers. IC Role / Device Role / Timing Role: Limiting TIA converting PIN photodiode current to clean CML data stream with deterministic jitter <13 psPP. Use Value: Enables reliable link budget margin with –14 dBm unstressed sensitivity and 2.5 mAPP overload tolerance. | Use Scenario: Front-panel 10GBASE-SR/LR optical interfaces in enterprise networking equipment. IC Role / Device Role / Timing Role: Core analog front-end providing RSSI feedback for automatic power control and AGC-stabilized limiting amplification. Use Value: Dual RSSI outputs support closed-loop bias control for both internal and external photodiode configurations, improving dynamic range stability. |
| SONET OC-192 Receivers | PIN/APD Preamplifier Receivers |
Use Scenario: Telecom line cards handling synchronous optical network traffic at 9.953 Gbps. IC Role / Device Role / Timing Role: High-bandwidth TIA with 10 GHz small-signal response ensuring compliance with SONET jitter transfer masks. Use Value: 7 kΩ transimpedance and low 1.6 μA RMS input noise deliver required BER <10–12 at –14 dBm sensitivity. | Use Scenario: Custom optical modules using either PIN diodes (internal bias) or APDs (external bias) for extended reach. IC Role / Device Role / Timing Role: Single-die solution supporting both architectures via dedicated FILTER and RSSI_EB pins. Use Value: Eliminates need for separate TIA variants-reduces BOM count and simplifies qualification across multiple photodiode types. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3748AETE+ | Lower bandwidth (8.5 GHz), no integrated RSSI, requires external termination resistors | Targeted at cost-sensitive 10G SFP+ where RSSI is not required and layout area allows external components | Choose when RSSI functionality is unnecessary and lower power (75 mW) is prioritized over bandwidth headroom |
| LMH6525MA/NOPB | Higher noise floor (2.2 μA RMS), no AGC, fixed-gain architecture, no on-die filtering | Suitable for non-limiting preamp applications with external gain control and discrete supply filtering | Prefer when system-level AGC is implemented externally and higher input-referred noise is acceptable |
Compared with MAX3748AETE+ and LMH6525MA/NOPB, the ONET8501TY delivers superior bandwidth and integrated RSSI/AGC functionality in a die form factor optimized for TO-can optical modules-making it uniquely suited for high-performance, space-constrained 10G+ receiver designs requiring self-contained bias and monitoring.
Availability
ONET8501TY is available at Aetrix Electronics and suitable for SFP+, 10G Ethernet, and SONET OC-192 optical receiver modules requiring stable component supply, long-term lifecycle continuity, and traceable sourcing for telecom infrastructure programs.
Supply support for ONET8501TY 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 technologies for industrial, automotive, and communications markets.
The ONET8501TY belongs to TI's high-speed optical interconnect product line, engineered specifically for 10+ Gbps fiber-optic receiver front-ends requiring low-noise, limiting amplification with integrated bias and signal monitoring capabilities.
FAQ
What is the primary function of the ONET8501TY in optical receiver systems?
The ONET8501TY serves as a limiting transimpedance amplifier that converts photodiode current into a clean, differential CML data stream. It provides 7 kΩ transimpedance gain, 10 GHz bandwidth, automatic gain control, and received signal strength indication-enabling robust 10.3125 Gbps operation in SFP+, 10G Ethernet, and OC-192 receivers. Its design ensures stable limiting behavior across wide input current ranges while minimizing deterministic jitter.
Does the ONET8501TY support both PIN and APD photodiodes?
Yes, the ONET8501TY supports both PIN and APD photodiodes through dual bias and RSSI configurations. For PIN diodes, use FILTER1/FILTER2 pins for internal bias and RSSI_IB for signal monitoring. For APDs-or externally biased PINs-use RSSI_EB with an external bias circuit. The device's separate VCC_IN and VCC_OUT supplies, along with dedicated RSSI paths, ensure optimal performance in either topology without hardware modification.
How does the ONET8501TY handle power supply noise?
The ONET8501TY achieves –15 dB power supply noise rejection (PSNR) below 10 MHz when used with supply filtering per SFF-8431 guidelines. Its on-die supply filter capacitors for VCC_IN and VCC_OUT reduce sensitivity to board-level ripple, while the separate supply domains isolate noise-sensitive TIA circuitry from output-stage switching transients-critical for maintaining low-jitter performance in noisy optical module environments.
What package form is the ONET8501TY delivered in, and how is it mounted?
The ONET8501TY is delivered as a bare die (DIESALE package) measuring 940 × 1195 μm with 19 bond pads. It is intended for wire-bond assembly into TO-46 or similar hermetic optical receiver cans. Mounting requires precise die attach, photodiode placement adjacent to the IN pad to minimize bond-wire inductance, and careful routing of FILTER, RSSI, and output traces to preserve 10 GHz signal integrity.
Can the ONET8501TY operate outside the standard 3.3 V supply range?
No-the ONET8501TY is specified for 2.97 V to 3.63 V (±10%) operation only. Absolute maximum ratings limit supply voltage to 4.0 V, and performance parameters-including transimpedance, bandwidth, and RSSI accuracy-are guaranteed only within the recommended 3.3 V ±10% range. Operating outside this window risks degraded AGC response, increased deterministic jitter, or permanent damage due to overvoltage stress on internal MOS structures.
ONET8501TY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Amplifier Type:
- Transimpedance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 10 GHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 28mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.97 V
- Voltage - Supply Span (Max):
- 3.63 V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Diesale
ONET8501TY FAQ
1.How can I place an order for ONET8501TY through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET8501TY 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 ONET8501TY reliable?
The price and inventory of ONET8501TY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET8501TY is usually 5 days.
3.What payment methods are accepted for ONET8501TY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET8501TY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET8501TY?
ONET8501TY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET8501TY 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 ONET8501TY?
For technical support, including ONET8501TY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET8501TY requirements.
6.How does Aetrix verify that ONET8501TY is sourced from the original manufacturer or authorized distributors?
All ONET8501TY 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 ONET8501TY meets industry standards.
7.What is the process for return or replacement of ONET8501TY?
All ONET8501TY units undergo pre-shipment inspection (PSI). If there is an issue with ONET8501TY, 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 ONET8501TY part is unused and in its original packaging.
Return procedure for ONET8501TY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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