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Texas Instruments OPA635N/250
- Part No.:
- OPA635N/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA635N/250.pdf
- Description:
- IC OPAMP VFB 140MHZ SGL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
OPA635N/250 from Texas Instruments is a wideband, single-supply voltage-feedback operational amplifier with zero-power disable functionality, 150MHz small-signal bandwidth at G = +2, 250V/µs slew rate, and 5.6nV/√Hz input voltage noise-designed for high-fidelity ADC input buffering and composite video line driving on +3V to +10V supplies.
For engineers reviewing the OPA635N/250 datasheet, OPA635N/250 pinout, OPA635N/250 application, or OPA635N/250 equivalent, this page delivers verified specifications, SOT23-6 package terminal mapping, disable timing behavior, output swing limits under 150Ω load, and real-world selection guidance against functionally comparable alternatives.
Technical Context
The OPA635N/250 uses a complementary common-emitter output stage enabling rail-to-rail output swing (to within 30mV of ground and 140mV of VS) while maintaining low distortion across 5–20MHz video and IF bands. Its voltage-feedback architecture supports stable unity-gain operation and exhibits 140MHz gain-bandwidth product with controlled peaking (5dB at G = +1).
Unlike standard low-power op amps, distortion performance improves at reduced signal swing. The dedicated DIS pin enables sub-100ns disable/enable transitions and reduces quiescent current to 0µA when driven HIGH-critical for power-gated signal chains in portable and battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 150MHz at G = +2, VO ≤ 0.5Vp-p (enables 720p/1080i video signal amplification without phase loss) |
| Slew Rate | 250V/µs (supports clean 2V-step transient response in <15ns settling time to 0.1%) |
| Input Voltage Noise | 5.6nV/√Hz above 1MHz (preserves SNR in wide-dynamic-range ADC front ends) |
| Output Drive Current | ±80mA sourcing/sinking (drives 150Ω video loads or 50Ω RF interfaces directly) |
| Disable Quiescent Current | 0µA typical (zero static power consumption during sleep mode) |
| Supply Range | +3V to +10V single supply (operates from Li-ion battery or regulated 3.3V/5V rails) |
| Input Common-Mode Range | –0.24V to +3.8V at VS = +5V (accepts ground-referenced AC signals without level-shifting) |
Pinout & Package
SOT23-6 package (Texas Instruments drawing 332), 1.6mm × 2.9mm footprint, 0.95mm height, thermal resistance 150°C/W. Pin 1 marked by dot; top view orientation matches TI standard A35 marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Amplifier output node | Delivers full-swing signal; capable of ±80mA drive into 150Ω load at +5V supply |
| 2 (GND) | Analog ground reference | Return path for input bias current and output sink current; must be low-impedance |
| 3 (Non-Inverting Input) | Positive input terminal | Accepts DC-coupled signals down to –0.24V; used for level-shifted ADC interface circuits |
| 4 (+VS) | Positive supply connection | Supports +3V to +10V operation; internal biasing maintains stable quiescent current across voltage range |
| 5 (DIS) | Active-low disable control | Pulled HIGH disables amplifier (0µA IQ); pulled LOW ≤1.0V enables operation (12mA IQ) |
| 6 (Inverting Input) | Negative input terminal | Feedback node; requires matched impedance to non-inverting input for offset minimization |
Key Features
| Feature | Design Value |
|---|---|
| Zero-power disable | DIS pin reduces supply current to 0µA-enables true power gating in always-on sensor nodes |
| Rail-to-rail output swing | 0.03V to 4.86V on +5V/1kΩ load (97% of rail span) preserves dynamic range in low-voltage ADC drivers |
| Low distortion at low swing | 2nd-harmonic distortion improves as output amplitude decreases-ideal for variable-gain IF stages |
| High-speed enable/disable | 60ns enable time and 100ns disable time support burst-mode signal processing |
| Wide supply range | Operates from +2.7V min to +10.5V max-compatible with both 3.3V embedded systems and industrial +10V rails |
Applications
| ADC Input Buffering | Composite Video Line Driving |
|---|---|
Use Scenario: DC-coupled interface between analog sensor and 10-bit, 20Msps ADC (e.g., ADS900) on +3V supply. IC Role / Device Role / Timing Role: Single-supply op amp providing level-shifted, low-distortion input signal with precise common-mode bias. Use Value: Enables full-scale 1V–2V output swing into ADC input while maintaining <0.16° NTSC differential phase error. |
Use Scenario: Driving 75Ω coaxial cable for NTSC/PAL video signals in security camera or broadcast equipment. IC Role / Device Role / Timing Role: High-current, low-phase-error line driver with 4.8V output swing on +5V supply. Use Value: Delivers 0.10% NTSC differential gain and 0.16° differential phase-meets broadcast-grade video fidelity requirements. |
| Wireless LAN IF Amplifier | CCD Imaging Channel |
Use Scenario: Intermediate-frequency amplification in 2.4GHz WLAN receivers before quadrature demodulation. IC Role / Device Role / Timing Role: Wideband, low-noise gain block operating at 5–20MHz IF with disable control for TDD mode. Use Value: 65dBc SFDR at 5MHz and 215V/µs slew rate preserve EVM in OFDM symbol reconstruction. |
Use Scenario: Pixel charge amplification and correlated double sampling (CDS) in scientific CCD cameras. IC Role / Device Role / Timing Role: Low-noise, fast-settling buffer for integrating amplifier outputs prior to ADC sampling. Use Value: 5.6nV/√Hz input noise and 15ns 0.1% settling time minimize readout noise and frame latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, single-supply operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA634N/250 | No DIS pin; 12mA fixed quiescent current; identical bandwidth, noise, and output drive | Lacks power-gating capability-unsuitable for duty-cycled or battery-constrained systems | Select when disable functionality is unnecessary and board space allows SO-8 or SOT23-5 footprint |
| LMH6629MA/NOPB | Higher 1.5GHz GBW but 11.5mA IQ; no disable; 2.1nV/√Hz noise; SO-8 only | Better noise performance but lacks zero-power shutdown and SOT23-6 packaging | Prefer for ultra-low-noise IF gain stages where power gating and small footprint are secondary |
Compared with OPA635N/250, OPA634N/250 offers identical analog performance without disable control, while LMH6629MA/NOPB trades zero-power shutdown for lower noise and higher bandwidth-but only in larger SO-8 packaging.
Availability
OPA635N/250 is available at Aetrix Electronics and suitable for single-supply ADC input buffering, composite video line driving, and wireless LAN IF amplification requiring stable component supply, guaranteed traceable sourcing, and long-term production continuity.
Supply support for OPA635N/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 leader specializing in analog and embedded processing technologies, with over 50 years of precision amplifier innovation and broad industrial, automotive, and communications portfolio coverage.
The OPA635N/250 belongs to TI's OPA63x family of high-speed, low-power voltage-feedback op amps-engineered specifically for single-supply, wideband signal conditioning in portable instrumentation, imaging, and communications infrastructure.
FAQ
What is the maximum output voltage swing of the OPA635N/250 on a +5V supply?
The OPA635N/250 delivers a minimum output swing of 0.1V to 4.65V into a 150Ω load referenced to +2.5V, and 0.03V to 4.86V into a 1kΩ load. This 4.83V peak-to-peak swing represents 97% of the +5V rail, enabled by its complementary common-emitter output stage. These values are guaranteed over temperature and process variation per SBOS097A datasheet Section "OUTPUT".
Does the OPA635N/250 support true rail-to-rail input operation?
The OPA635N/250 does not support full rail-to-rail input-its input common-mode range extends from –0.24V to +3.8V at +5V supply, meaning it accepts signals slightly below ground and up to 1.2V below VS. This exceeds most single-supply ADC input ranges and enables direct coupling of ground-referenced sensors without external level shifting, as confirmed in the "INPUT" section of SBOS097A.
How does the DIS pin function on the OPA635N/250?
The DIS pin on the OPA635N/250 is active-low: pulling it ≤1.0V (max) enables normal operation with ~12mA quiescent current, while pulling it ≥4.0V (min) disables the amplifier and reduces quiescent current to 0µA. Disable and enable times are 100ns and 60ns respectively, and off-isolation exceeds 70dB at 5MHz-verified in the "DISABLE (OPA635 only)" table of SBOS097A.
Can the OPA635N/250 drive a 50Ω load directly?
Yes-the OPA635N/250 sources and sinks ≥80mA, enabling direct 50Ω drive at moderate amplitudes. At +5V supply, it delivers ≥4.5V output into 150Ω (typical video load); for 50Ω, output swing compresses to ~4.2V with increased harmonic distortion. TI recommends series termination (e.g., 20Ω) and careful layout to maintain stability, as detailed in Figure 5 and "INVERTING AMPLIFIER OPERATION" sections of SBOS097A.
What is the gain-bandwidth product of the OPA635N/250 and how is it applied in design?
The OPA635N/250 has a guaranteed minimum gain-bandwidth product of 140MHz at G ≥ +10. However, due to internal compensation, its small-signal bandwidth reaches 150MHz at G = +2-exceeding the simple GBP/G prediction. Designers must use noise gain (not signal gain) for bandwidth estimation, especially in non-inverting configurations with added RC compensation, as explained in "BANDWIDTH VERSUS GAIN" and Figure 4 of SBOS097A.
OPA635N/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SpeedPlus™
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 250V/µs
- Gain Bandwidth Product:
- 140 MHz
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 25 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 12mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 10.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
OPA635N/250 FAQ
1.How can I place an order for OPA635N/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA635N/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 OPA635N/250 reliable?
The price and inventory of OPA635N/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA635N/250 is usually 5 days.
3.What payment methods are accepted for OPA635N/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA635N/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA635N/250?
OPA635N/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA635N/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 OPA635N/250?
For technical support, including OPA635N/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA635N/250 requirements.
6.How does Aetrix verify that OPA635N/250 is sourced from the original manufacturer or authorized distributors?
All OPA635N/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 OPA635N/250 meets industry standards.
7.What is the process for return or replacement of OPA635N/250?
All OPA635N/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA635N/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 OPA635N/250 part is unused and in its original packaging.
Return procedure for OPA635N/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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