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Texas Instruments OPA857TD1
- Part No.:
- OPA857TD1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
OPA857TD1.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT DIE
- Quantity:
- Payment:
- Shipping:
Inventory:4,265
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Product details
Overview
OPA857TD1 from Texas Instruments is a bare-die ultralow-noise, wideband transimpedance amplifier (TIA) with selectable 5-kΩ or 20-kΩ internal feedback resistance, 125 MHz closed-loop bandwidth (at 5-kΩ), 15 nARMS input-referred current noise (at 20-kΩ), and <25 ns overload recovery time - designed for photodiode monitoring in high-speed optical front-ends.
For engineers reviewing the OPA857TD1 datasheet, OPA857TD1 pinout, OPA857TD1 application, or OPA857TD1 equivalent, key selection criteria include transimpedance gain configurability, input-referred noise at 135 MHz brickwall bandwidth, supply current (23.4 mA), operating temperature range (–40°C to +85°C), and die-level integration for compact optical receiver modules.
Technical Context
The OPA857TD1 implements a single-supply, pseudo-differential output architecture with internal midscale reference voltage generation and logic-controlled gain selection via the CTRL pin. Its fast-settling, low-noise front-end supports high dynamic range I/V conversion without external feedback components.
It features integrated input protection diodes and operates from 2.7 V to 3.6 V, delivering stable performance across –40°C to +85°C. The die form factor enables custom hybrid packaging for space-constrained optical sensing applications where thermal and parasitic capacitance control are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transimpedance Gain | Selectable 5-kΩ or 20-kΩ via CTRL pin logic level - enables dual-range optical signal conditioning without external resistors. |
| Closed-Loop Bandwidth | 125 MHz at 5-kΩ / 105 MHz at 20-kΩ (with 1.5-pF parasitic capacitance) - defines maximum usable data rate for analog optical receivers. |
| Input-Referred Current Noise | 15 nARMS at 20-kΩ gain (brickwall BW = 135 MHz) - sets minimum detectable photocurrent in low-light, high-bandwidth systems. |
| Overload Recovery Time | <25 ns - ensures rapid return to linear operation after photodiode saturation events, preserving pulse fidelity. |
| Supply Voltage | 2.7 V to 3.6 V - compatible with low-voltage optical module power rails and battery-powered portable instrumentation. |
| Quiescent Current | 23.4 mA - determines total power budget for multi-channel TIA arrays in dense optical front-ends. |
| Operating Temperature | –40°C to +85°C - validated for industrial-grade optical sensing in CAT-scanners, fiber receivers, and laser diagnostics. |
Pinout & Package
Bare die in gel pak VR format; 15-pad silicon die with TiW/AlCu metallization (1100 nm thick), 15-mil thickness, grounded backside, and bond pad coordinates specified per micron-level layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pads 1,3,4,6,7,12) | Ground reference | Multiple dedicated ground pads minimize ground loop inductance and improve PSRR in high-frequency TIA operation. |
| CTRL (Pad 2) | Gain select control | Logic-low (GND) selects 5-kΩ transimpedance; logic-high (+VS) selects 20-kΩ - enables real-time dynamic range adaptation. |
| OUT (Pad 8) | Differential signal output | Active signal output node; used with OUTN to form pseudo-differential pair for improved common-mode noise rejection. |
| OUTN (Pad 5) | Common-mode reference | Provides midscale DC reference voltage (VCM) for OUT - eliminates need for external bias network in AC-coupled designs. |
| IN (Pad 15) | Photocurrent input | High-impedance, protected input terminal for direct connection to photodiode cathode/anode - includes integrated ESD diodes. |
| +VS (Pads 9,10,11) | Positive supply | Three distributed supply pads reduce IR drop and improve high-frequency decoupling for stable 23.4-mA operation. |
| TESD_SD (Pad 13) | Test mode enable | Connect to GND for normal operation; tie to +VS only during factory test - prevents unintended activation in end equipment. |
| TEST_IN (Pad 14) | Test input | Reserved for internal wafer-level testing; must be tied to +VS in production use - ensures functional integrity of CTRL and gain path. |
Key Features
| Feature | Design Value |
|---|---|
| Selectable transimpedance gain | Hardware-configurable 5-kΩ or 20-kΩ via single CTRL pin - eliminates external resistor networks and layout sensitivity. |
| Pseudo-differential output architecture | OUT/OUTN pair delivers inherent common-mode noise rejection without requiring external differential ADC drivers. |
| Ultralow input-referred current noise | 15 nARMS at 20-kΩ gain enables detection of sub-nA photocurrents in 100+ MHz bandwidth applications. |
| Fast overload recovery | <25 ns recovery ensures minimal pulse distortion in burst-mode optical communication or time-of-flight systems. |
| Integrated input protection | On-die ESD diodes safeguard IN pin against ±2-kV HBM events - reduces need for external TVS in compact optical modules. |
Applications
| Photodiode Monitoring | Optical Amplifier Front-End |
|---|---|
Use Scenario: Real-time monitoring of low-light photodiode signals in medical laser diagnostics and spectroscopy systems. IC Role / Device Role / Timing Role: Transimpedance amplifier converting nanoampere-level photocurrent into clean, high-bandwidth voltage output. Use Value: 15 nARMS noise floor and 125 MHz bandwidth enable accurate capture of fast optical pulses with minimal SNR degradation. | Use Scenario: Signal conditioning stage in Erbium-doped fiber amplifier (EDFA) monitor paths for gain stabilization. IC Role / Device Role / Timing Role: High-linearity I/V converter feeding AGC loop with stable DC and AC photocurrent representation. Use Value: Selectable 5-kΩ/20-kΩ gain allows single design to handle both low-power pilot tones and high-power channel monitoring. |
| CAT-Scanner Detector Interface | High-Speed Fiber Receiver |
Use Scenario: Front-end amplification for scintillator-coupled photodiodes in computed tomography detector arrays. IC Role / Device Role / Timing Role: Low-latency, low-noise TIA capturing X-ray-induced photon bursts with precise timing alignment. Use Value: <25 ns overload recovery preserves pulse shape fidelity during high-flux X-ray exposure events. | Use Scenario: Analog front-end for 10-Gbps PON or active optical cable receivers requiring analog signal integrity. IC Role / Device Role / Timing Role: First-stage current-to-voltage conversion before limiting amplifier or CDR circuitry. Use Value: 105 MHz bandwidth at 20-kΩ gain supports full NRZ eye opening for 10-Gbps optical data links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6629MA/NOPB | Fixed 10-kΩ transimpedance; higher 22 nARMS noise; no gain-select logic; SOIC-8 package. | Best suited for fixed-gain, PCB-mounted designs where die-level integration and dual-range operation are not required. | Choose when board space permits standard packaging and system gain is static. |
| ADA4350ACPZ-R7 | Programmable gain via SPI interface; 10-MHz max bandwidth; 2.5 nARMS noise at 1-kΩ; LFCSP-24 package. | Targets lower-frequency, digitally controlled precision I/V conversion - not suitable for >100-MHz optical front-ends. | Choose when digital gain adjustment and ultra-low noise at low bandwidth outweigh speed requirements. |
Compared with LMH6629MA/NOPB and ADA4350ACPZ-R7, the OPA857TD1 uniquely combines die-level integration, hardware-selectable gain, sub-25-ns overload recovery, and 100+ MHz bandwidth - making it the only option optimized for miniaturized, high-dynamic-range optical receivers.
Availability
OPA857TD1 is available at Aetrix Electronics and suitable for photodiode monitoring, CAT-scanner front-ends, and high-speed fiber receiver designs requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for OPA857TD1 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 company specializing in analog and embedded processing technologies, with leadership in high-performance signal chain and power management solutions.
The OPA857TD1 belongs to TI's high-speed precision amplifier product line, engineered specifically for optical sensing and photodiode-based measurement systems demanding ultralow noise, wide bandwidth, and robust overdrive recovery.
FAQ
What is the function of the CTRL pin on the OPA857TD1?
The CTRL pin on the OPA857TD1 selects transimpedance gain: logic low (GND) configures 5-kΩ gain, and logic high (+VS) configures 20-kΩ gain. This hardware-selectable feature eliminates external feedback resistors and enables dynamic range adaptation in optical front-ends. The OPA857TD1 uses this pin to switch between two optimized gain modes without reconfiguration overhead or digital interface latency.
Does the OPA857TD1 require external components for biasing its outputs?
No, the OPA857TD1 does not require external biasing components. It generates an internal midscale reference voltage delivered at the OUTN pin, which serves as the common-mode reference for the pseudo-differential output pair (OUT/OUTN). This self-biasing capability simplifies AC-coupled designs and reduces component count in compact optical modules using the OPA857TD1.
What is the maximum parasitic capacitance supported at the IN pin of the OPA857TD1?
The OPA857TD1 is characterized for 1.5-pF external parasitic capacitance at the IN pin, under which it achieves 125 MHz bandwidth at 5-kΩ gain and 105 MHz at 20-kΩ gain. Exceeding this capacitance degrades bandwidth and stability; layout best practices for the OPA857TD1 include minimizing trace length and using guard rings to maintain specified performance. System-level validation of the OPA857TD1 must account for actual photodiode junction and PCB parasitics.
How is the OPA857TD1 protected against electrostatic discharge?
The OPA857TD1 includes internal input protection diodes on the IN pin, rated for ±2-kV HBM per TI's standard qualification. As a bare-die device, it also requires proper handling per ESD-sensitive IC protocols - including grounded workstations and ionized air environments. These protections are integral to the OPA857TD1 die structure and do not rely on external TVS devices for basic robustness in optical module assembly.
Can the OPA857TD1 operate from a 2.5-V supply?
No, the OPA857TD1 has a specified minimum supply voltage of 2.7 V and maximum of 3.6 V; operation at 2.5 V falls outside its guaranteed operating range and may result in degraded bandwidth, increased noise, or failure to meet datasheet specifications. Designs using the OPA857TD1 must ensure regulated 2.7–3.6-V supply rails - for example, using a dedicated LDO - to maintain performance consistency across temperature and load conditions.
OPA857TD1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Transimpedance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 220V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 MHz
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 23.4mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.6 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
OPA857TD1 FAQ
1.How can I place an order for OPA857TD1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA857TD1 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 OPA857TD1 reliable?
The price and inventory of OPA857TD1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA857TD1 is usually 5 days.
3.What payment methods are accepted for OPA857TD1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA857TD1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA857TD1?
OPA857TD1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA857TD1 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 OPA857TD1?
For technical support, including OPA857TD1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA857TD1 requirements.
6.How does Aetrix verify that OPA857TD1 is sourced from the original manufacturer or authorized distributors?
All OPA857TD1 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 OPA857TD1 meets industry standards.
7.What is the process for return or replacement of OPA857TD1?
All OPA857TD1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA857TD1, 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 OPA857TD1 part is unused and in its original packaging.
Return procedure for OPA857TD1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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