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Texas Instruments OPA355NA/250
- Part No.:
- OPA355NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA355NA/250.pdf
- Description:
- IC CMOS 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
OPA355NA/250 from Texas Instruments is a single-channel, 200-MHz CMOS operational amplifier with shutdown control, rail-to-rail output (within 100 mV), 450-MHz unity-gain bandwidth, and 5.8 nV/√Hz input voltage noise-designed for high-fidelity video buffering, photodiode transimpedance amplification, and ADC input conditioning in portable 2.5–5.5 V systems.
For engineers reviewing the OPA355NA/250 datasheet, OPA355NA/250 pinout, OPA355NA/250 application, or OPA355NA/250 equivalent, key selection criteria include its 100 ns enable time, 30 ns disable time, 0.02% differential gain error, 75 MHz 0.1-dB gain flatness, and thermal shutdown at 160°C-critical for video signal integrity and power-constrained designs.
Technical Context
The OPA355NA/250 implements a voltage-feedback CMOS architecture optimized for unity-gain stability and wideband operation up to 450 MHz small-signal bandwidth. Its input stage supports common-mode voltage down to 100 mV below ground and up to 1.5 V below V+, enabling true single-supply operation across 2.5–5.5 V rails.
It integrates a digital enable function that places the output in high-impedance state during shutdown, drawing only 3.4 µA per channel while maintaining fast 100 ns enable / 30 ns disable timing-enabling dynamic power gating in multiplexed analog signal paths without external isolation switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 450 MHz - enables stable 1× voltage follower operation with minimal phase margin degradation at high frequencies. |
| Gain-Bandwidth Product | 200 MHz - defines closed-loop bandwidth limit for non-inverting gains >1 (e.g., 100 MHz at G = 2). |
| Input Voltage Noise | 5.8 nV/√Hz at 1 MHz - preserves SNR in low-level signal amplification (e.g., photodiode current conversion). |
| Differential Gain Error | 0.02% - ensures <0.02% amplitude distortion in NTSC/PAL composite video signal processing. |
| Rail-to-Rail Output Swing | Within 100 mV of rails at 150 Ω load - maximizes dynamic range in 3.3 V or 5 V single-supply systems. |
| Shutdown Current | 3.4 µA per channel - reduces system standby power by >99% versus active 8.3 mA quiescent draw. |
| Enable/Disable Time | 100 ns / 30 ns - supports high-speed gated amplification and time-division multiplexing of analog signals. |
Pinout & Package
OPA355NA/250 is packaged in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size, rated for –40°C to +125°C operation. The package includes exposed pad thermal enhancement per TI's standard SOIC-D layout.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node; drives up to ±60 mA continuously into resistive loads; enters high-Z state when ENABLE = LOW. |
| 2 | V– | Negative supply terminal; accepts ground or negative rail; common-mode input extends 100 mV below this pin. |
| 3 | +IN | Noninverting input; CMOS input impedance >1013 Ω || 1.5 pF; bias current ≤3 pA at 25°C. |
| 4 | –IN | Inverting input; matched to +IN for precision differential operation; supports unity-gain stable feedback networks. |
| 5 | NC | No internal connection; must be left unconnected per TI datasheet Pin Functions table. |
| 6 | NC | No internal connection; must be left unconnected per TI datasheet Pin Functions table. |
| 7 | V+ | Positive supply terminal; operates from 2.5 V to 5.5 V; supplies 8.3 mA quiescent current per channel when enabled. |
| 8 | ENABLE | Digital control input; TTL-compatible; pulls up internally to V+ via 100 kΩ resistor; LOW disables amplifier and forces output high-Z. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal headroom within 100 mV of supply rails at 150 Ω load-critical for 3.3 V ADC drivers. |
| 75 MHz 0.1-dB gain flatness | Maintains amplitude accuracy across HD video baseband (0–75 MHz), meeting SMPTE 259M timing jitter requirements. |
| 0.02% differential gain / 0.05° differential phase | Preserves color fidelity in broadcast-quality NTSC video paths without external calibration. |
| Thermal shutdown protection | Automatically disables output at 160°C junction temperature and recovers at 140°C-prevents latch-up under sustained overload. |
| Single-supply operation from 2.5 V | Enables direct interface with Li-ion battery-powered systems (2.7–4.2 V) without level-shifting circuitry. |
Applications
| Video Processing | Photodiode Transimpedance Amplifiers |
|---|---|
Use Scenario: Driving composite NTSC video signals through 75 Ω coaxial cable to display hardware. IC Role / Device Role / Timing Role: Buffer amplifier with precise DC-coupled gain and minimal group delay variation. Use Value: 0.02% differential gain and 0.05° differential phase ensure broadcast-grade color reproduction without post-processing. | Use Scenario: Converting weak photocurrents (nA–µA range) from medical ultrasound transducers into measurable voltage. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with wide bandwidth for pulse-echo signal fidelity. Use Value: 5.8 nV/√Hz input voltage noise and 450 MHz bandwidth preserve transient edge integrity in time-of-flight measurements. |
| ADC Input Buffers | Optical Networking Receivers |
Use Scenario: Conditioning analog sensor outputs prior to sampling by 12-bit, 10 MSPS SAR ADCs. IC Role / Device Role / Timing Role: Driver with fast settling (<30 ns to 0.1%) and low THD to prevent code-dependent errors. Use Value: 30 ns 0.1% settling time and –93 dBc third-harmonic distortion maintain ENOB >11.5 bits at full speed. | Use Scenario: Amplifying low-amplitude RF-modulated optical receiver outputs in tunable laser modules. IC Role / Device Role / Timing Role: High-linearity post-amplifier for 100–500 MHz IF signals before demodulation. Use Value: 200 MHz GBW and –81 dBc second-harmonic distortion support 64-QAM constellation integrity. |
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 | Same 200-MHz GBW but no shutdown function; 5.5 nV/√Hz noise; SO-8 package. | Lacks enable/disable control-unsuitable for power-gated or multiplexed architectures. | Select when continuous operation is required and board space allows removal of external enable logic. |
| LMH6629MA/NOPB | Higher 1.5 GHz GBW; 1.9 nV/√Hz noise; no integrated shutdown; requires dual supply for full performance. | Better noise and bandwidth but higher quiescent current (12.5 mA); no thermal shutdown. | Choose for ultra-low-noise, wideband applications where power budget and thermal safety are managed externally. |
Compared with OPA355NA/250, OPA356IDBVR trades shutdown capability for marginally lower noise and identical bandwidth, while LMH6629MA/NOPB delivers superior noise and speed at the cost of higher supply current and no built-in power management-making OPA355NA/250 optimal for battery-powered, thermally constrained, or time-multiplexed video/analog signal chains.
Availability
OPA355NA/250 is available at Aetrix Electronics and suitable for video processing, photodiode transimpedance amplification, and ADC input buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA355NA/250 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 precision amplifiers, data converters, and power management ICs.
The OPA355 series belongs to TI's high-speed precision op amp product line, engineered specifically for video, medical imaging, optical networking, and instrumentation applications demanding wide bandwidth, low distortion, and robust power management.
FAQ
What is the operating supply voltage range for the OPA355NA/250?
The OPA355NA/250 operates from 2.5 V to 5.5 V total supply voltage-supporting both single-supply (e.g., 3.3 V or 5 V) and split-supply (±1.25 V to ±2.75 V) configurations. Recommended conditions specify 2.7 V to 5.5 V, with absolute maximum ratings limiting V+ to V– + 7.5 V. This range enables direct integration into Li-ion battery systems and legacy 5 V industrial platforms without level-shifting circuitry. The OPA355NA/250 maintains specified performance across the full –40°C to +125°C temperature range within this supply window.
Does the OPA355NA/250 support rail-to-rail input operation?
No, the OPA355NA/250 does not support rail-to-rail input. Its common-mode input voltage range extends from 100 mV below V– to 1.5 V below V+, meaning it accepts inputs down to ground in single-supply use but cannot swing fully to the positive rail. For example, with V+ = 5 V and V– = 0 V, the valid input range is –0.1 V to +3.5 V. This design prioritizes high-speed performance and low noise over full input rail coverage-distinguishing it from rail-to-rail input op amps like the OPA335. The OPA355NA/250 remains ideal for applications where the signal stays within this extended-but-not-full range, such as video DC-coupled buffers and transimpedance amplifiers.
How does the ENABLE pin function on the OPA355NA/250?
The ENABLE pin (Pin 8) on the OPA355NA/250 is a TTL-compatible digital control input that places the amplifier in low-power shutdown mode when driven LOW (≤0.8 V), reducing quiescent current to 3.4 µA per channel and forcing the output into high-impedance state. When driven HIGH (≥2.0 V), normal operation resumes with 8.3 mA supply current. An internal 100 kΩ pullup to V+ ensures default-enable behavior if left floating. The OPA355NA/250 achieves 100 ns enable time and 30 ns disable time-enabling precise gating in time-division multiplexed analog signal paths without external switches or relays.
What is the thermal shutdown behavior of the OPA355NA/250?
The OPA355NA/250 incorporates internal thermal shutdown that activates at 160°C junction temperature, disabling the amplifier output and reducing current draw to shutdown levels. Operation automatically resumes once the junction cools to approximately 140°C. This protection prevents permanent damage during sustained overload, short-circuit events, or inadequate PCB heat sinking. Thermal metrics for the SOIC-8 package show RθJA = 136.3°C/W, meaning ambient-to-junction rise is ~1.1°C per mW dissipated. The OPA355NA/250's thermal shutdown is independent of supply voltage and functions identically across its full operating temperature range (–40°C to +125°C).
Can the OPA355NA/250 drive a 75 Ω video load directly?
Yes, the OPA355NA/250 is explicitly characterized for 75 Ω video loads and delivers 0.02% differential gain and 0.05° differential phase error under NTSC conditions-meeting broadcast video specifications. It sustains rail-to-rail output swing within 100 mV at 150 Ω and provides ±60 mA continuous output current, sufficient for driving 75 Ω back-terminated lines. However, for optimal stability and gain flatness, TI recommends using a 604 Ω feedback resistor in unity-gain configuration with proper PCB layout (short traces, ground plane, decoupling). The OPA355NA/250's 75 MHz 0.1-dB gain flatness ensures minimal amplitude ripple across standard-definition and high-definition video basebands.
OPA355NA/250 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/250 FAQ
1.How can I place an order for OPA355NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA355NA/250 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/250 reliable?
The price and inventory of OPA355NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA355NA/250 is usually 5 days.
3.What payment methods are accepted for OPA355NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA355NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA355NA/250?
OPA355NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA355NA/250 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/250?
For technical support, including OPA355NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA355NA/250 requirements.
6.How does Aetrix verify that OPA355NA/250 is sourced from the original manufacturer or authorized distributors?
All OPA355NA/250 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/250 meets industry standards.
7.What is the process for return or replacement of OPA355NA/250?
All OPA355NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA355NA/250, 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/250 part is unused and in its original packaging.
Return procedure for OPA355NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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