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Texas Instruments OPA355NA/3K
- Part No.:
- OPA355NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA355NA/3K.pdf
- Description:
- IC CMOS 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,521
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Product details
Overview
OPA355NA/3K from Texas Instruments is a single-channel, high-speed CMOS operational amplifier optimized for video and wideband signal conditioning. It delivers 450 MHz unity-gain bandwidth, 200 MHz gain-bandwidth product, rail-to-rail output swing within 100 mV of rails, 5.8 nV/√Hz input voltage noise, and digital shutdown with 100 ns enable / 30 ns disable timing - enabling use in NTSC video buffers, photodiode transimpedance stages, and ADC input drivers.
For engineers reviewing the OPA355NA/3K datasheet, OPA355NA/3K pinout, OPA355NA/3K application, or OPA355NA/3K equivalent, key selection criteria include its 75 MHz 0.1-dB gain flatness, ±60 mA continuous output drive, –40°C to +125°C operating range, shutdown current of 3.4 µA, and compatibility with 2.5 V to 5.5 V single-supply operation.
Technical Context
The OPA355NA/3K implements a voltage-feedback CMOS architecture with unity-gain stability and a Class AB output stage capable of driving 150 Ω loads at 75 MHz while maintaining 0.02% differential gain and 0.05° differential phase. Its input common-mode range extends 100 mV below ground and up to 1.5 V below V+, supporting true single-supply operation down to 2.5 V.
Shutdown is controlled via a TTL-compatible enable pin referenced to V– in split-supply configurations; when disabled, the output enters high-impedance state and quiescent current drops to 3.4 µA per channel. Thermal shutdown activates at 160°C junction temperature and resets at 140°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 450 MHz - enables stable 1× gain configuration for video line drivers and ADC/DAC buffering without peaking. |
| Gain-Bandwidth Product | 200 MHz - supports closed-loop gains ≥2 with usable bandwidth (e.g., G=2 → 170 MHz @ 150 Ω load). |
| Input Voltage Noise | 5.8 nV/√Hz @ 1 MHz - preserves SNR in low-level analog front-ends like photodiode transimpedance amplifiers. |
| Rail-to-Rail Output | Swing within 100 mV of rails @ 150 Ω - maximizes dynamic range in 3.3 V or 5 V systems with limited headroom. |
| Enable/Disable Time | 100 ns enable / 30 ns disable - allows precise gating in time-multiplexed signal paths and burst-mode operation. |
| Differential Gain/Phase | 0.02% / 0.05° @ NTSC - meets broadcast-grade video fidelity requirements without external compensation. |
| Supply Range | 2.5 V to 5.5 V single supply - compatible with Li-ion, USB, and industrial 3.3 V/5 V rails without level-shifting. |
Pinout & Package
OPA355NA/3K is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, rated for –40°C to +125°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output; drives 150 Ω loads to 75 MHz with <0.1 dB gain flatness and enters high-Z when ENABLE = low. |
| 2 | V– | Negative supply terminal; reference for input common-mode range and enable logic in dual-supply configurations. |
| 3 | +IN | Noninverting input; supports rail-to-rail common-mode range from (V–) – 0.1 V to (V+) – 1.5 V. |
| 4 | –IN | Inverting input; matched to +IN for precision closed-loop gain accuracy and low input offset drift. |
| 6 | V+ | Positive supply terminal; accepts 2.5 V to 5.5 V; internal bias generation enables full functionality across range. |
| 8 | ENABLE | Digital control input; TTL-compatible (logic high ≥2 V); pulls up internally to V+ via 100 kΩ resistor if left open. |
Key Features
| Feature | Design Value |
|---|---|
| Video-optimized distortion performance | 0.02% differential gain / 0.05° differential phase ensures broadcast-compliant NTSC/PAL signal integrity. |
| Low-noise CMOS input stage | 5.8 nV/√Hz input voltage noise and 3 pA input bias current minimize error in high-impedance sensor interfaces. |
| Fast, low-power shutdown | 3.4 µA shutdown current with 30 ns disable time enables microsecond-scale power cycling in portable instruments. |
| Rail-to-rail output swing | Output reaches within 100 mV of both supply rails at 150 Ω load, preserving >95% of available voltage swing. |
| Thermal protection | Integrated thermal shutdown triggers at 160°C junction temperature and auto-resets at 140°C, preventing latch-up. |
Applications
| Video Processing | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: Driving composite video signals in security camera modules with minimal group delay and phase distortion. IC Role / Device Role / Timing Role: Buffer amplifier with unity-gain configuration, providing impedance isolation and slew-rate-limited signal integrity. Use Value: 0.02% differential gain and 0.05° differential phase meet ITU-R BT.601 broadcast standards without external tuning. |
Use Scenario: Converting weak photocurrents (nA–µA) from medical pulse oximetry sensors into clean voltage outputs. IC Role / Device Role / Timing Role: Transimpedance amplifier with low input bias current and low voltage noise to maximize SNR. Use Value: 3 pA input bias current prevents DC error accumulation; 5.8 nV/√Hz noise floor preserves small-signal resolution. |
| ADC Input Buffer | Optical Networking Signal Conditioning |
|
Use Scenario: Driving SAR and pipeline ADC inputs in high-speed data acquisition systems sampling at ≥10 MSPS. IC Role / Device Role / Timing Role: High-fidelity buffer isolating source impedance and settling within 30 ns to 0.1%. Use Value: 30 ns 0.1% settling time and 300 V/µs slew rate prevent conversion errors during fast input transitions. |
Use Scenario: Amplifying modulated RF signals in tunable laser driver feedback loops and optical receiver front-ends. IC Role / Device Role / Timing Role: Wideband gain block supporting 75 MHz flat response and low harmonic distortion. Use Value: –81 dBc second-harmonic distortion at 1 MHz ensures clean spectral purity for coherent optical detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA356IDBVR | Higher 450 MHz GBW but no shutdown function; 10.5 mA quiescent current vs 8.3 mA enabled. | Lacks enable/disable control - unsuitable for power-gated or burst-mode systems requiring µA-level sleep current. | Select when maximum bandwidth and lowest distortion are prioritized over power management capability. |
| LMH6629MA/NOPB | Lower 200 MHz GBW, higher 10.5 nV/√Hz noise, no rail-to-rail output (1.2 V headroom), no integrated shutdown. | Requires dual supply for ground-referenced inputs; not suitable for single-supply video or portable battery designs. | Choose only when legacy LMH6629 footprint compatibility is required and shutdown is implemented externally. |
Compared with OPA355NA/3K, OPA356IDBVR trades shutdown capability for marginally better AC performance, while LMH6629MA/NOPB lacks rail-to-rail output and integrated power control - making OPA355NA/3K uniquely suited for space-constrained, battery-aware, single-supply video and sensing applications.
Availability
OPA355NA/3K is available at Aetrix Electronics and suitable for video processing, photodiode transimpedance amplification, and ADC input buffering requiring stable component supply across automotive, industrial, and medical device production cycles.
Supply support for OPA355NA/3K 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 and embedded processing technologies, with decades of expertise in high-performance op amps and signal chain solutions.
The OPA355 series was designed specifically for wideband video, optical networking, and precision sensor signal conditioning - delivering broadcast-grade fidelity, low-noise CMOS inputs, and integrated power management in compact packages.
FAQ
What is the operating supply voltage range for the OPA355NA/3K?
The OPA355NA/3K operates from 2.5 V to 5.5 V on a single supply, or ±1.25 V to ±2.75 V on dual supplies. The recommended range is 2.7 V to 5.5 V per the datasheet's electrical characteristics table. Operation below 2.5 V may compromise output swing and bandwidth; absolute maximum supply is 7.5 V between V+ and V–.
Does the OPA355NA/3K support rail-to-rail input?
No - the OPA355NA/3K features rail-to-rail *output* (within 100 mV of rails), but its input common-mode range extends from (V–) – 0.1 V to (V+) – 1.5 V. This allows ground-referenced inputs on single supply, but does not support full rail-to-rail input voltage swing. For true rail-to-rail input, consider the OPAx350 family instead.
How does the ENABLE pin function on the OPA355NA/3K?
The ENABLE pin (Pin 8) controls power state: logic high (≥2 V) enables normal operation (8.3 mA quiescent current); logic low (≤0.8 V) disables the amplifier, reducing current to 3.4 µA and placing the output in high-impedance state. An internal 100 kΩ pullup to V+ ensures default-on behavior if left unconnected.
What is the maximum continuous output current for the OPA355NA/3K?
The OPA355NA/3K supports ±60 mA continuous output current per the datasheet's "Recommended Operating Conditions" and "Electrical Characteristics" tables. Exceeding this value risks thermal overload; peak pulsed current can reach ±100 mA at 5 V supply, but sustained operation above ±60 mA is not recommended per TI's design guidelines.
Is the OPA355NA/3K suitable for driving 50 Ω transmission lines?
Yes - the OPA355NA/3K delivers 100 MHz small-signal bandwidth into 50 Ω loads (G=2 configuration) and maintains 0.1-dB gain flatness to 75 MHz with appropriate feedback network design (e.g., RF = 560 Ω). However, output voltage swing is reduced under heavy loading; verify output compliance using Figure 21/22 (VO vs IO) curves in the datasheet for your specific supply and load conditions.
OPA355NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 360V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- 450 MHz
- Current - Input Bias:
- 3 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 8.3mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
OPA355NA/3K FAQ
1.How can I place an order for OPA355NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA355NA/3K 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 OPA355NA/3K reliable?
The price and inventory of OPA355NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA355NA/3K is usually 5 days.
3.What payment methods are accepted for OPA355NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA355NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA355NA/3K?
OPA355NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA355NA/3K 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 OPA355NA/3K?
For technical support, including OPA355NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA355NA/3K requirements.
6.How does Aetrix verify that OPA355NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA355NA/3K 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 OPA355NA/3K meets industry standards.
7.What is the process for return or replacement of OPA355NA/3K?
All OPA355NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA355NA/3K, 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 OPA355NA/3K part is unused and in its original packaging.
Return procedure for OPA355NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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