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Texas Instruments OPA634N/3K
- Part No.:
- OPA634N/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA634N/3K.pdf
- Description:
- IC OPAMP VFB 140MHZ SGL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
OPA634N/3K from Texas Instruments is a wideband, single-supply voltage-feedback operational amplifier in SOT23-5 package, featuring 150MHz small-signal bandwidth (G = +2, +5V supply), 250V/µs slew rate, 5.6nV/√Hz input voltage noise, 80mA output drive, and rail-to-rail output swing within 30mV of ground and 140mV of VS. It serves as high-fidelity ADC input buffer and composite video line driver in portable instrumentation and low-power imaging systems.
For engineers reviewing the OPA634N/3K datasheet, OPA634N/3K pinout, OPA634N/3K application, or OPA634N/3K equivalent, key selection criteria include its +3V to +10V single-supply operation, ground-sensing input range, 4.8V output swing on +5V, low distortion at 5–20MHz, and SOT23-5 thermal resistance of 150°C/W - all critical for space-constrained, battery-powered signal conditioning designs.
Technical Context
The OPA634N/3K employs a voltage-feedback architecture with complementary common-emitter output stage, enabling output swing to within 30mV of ground and 140mV of VS while maintaining unity-gain stability. Its input stage operates down to –0.25V (at +3V supply) and up to 1.8V, supporting true DC-coupled level-shifting interfaces.
Unlike disable-capable OPA635, the OPA634N/3K lacks a DIS pin and delivers continuous operation with 10.8–13.5mA quiescent current across –40°C to +85°C. Its gain-bandwidth product remains stable at ≥140MHz (G ≥ +10), and peaking is limited to 5dB at G = +1 - optimized for flat response in gain-of-2 video and ADC buffer configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 150MHz at G = +2, +5V supply - enables full HD video signal amplification without attenuation |
| 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 CCD and ultrasound front-ends |
| Output Drive Current | 80mA sourcing / 100mA sinking - drives 150Ω video loads and 1kΩ ADC inputs simultaneously |
| Input Voltage Range | –0.25V to +1.8V at +3V supply - allows direct coupling of 0–0.5V sensor outputs with no level-shifter |
| Output Voltage Swing | 0.035V to 2.9V (RL = 1kΩ, +3V) - delivers >2.8Vp-p usable swing for 10-bit ADCs like ADS900 |
| Supply Voltage Range | +2.7V to +10.5V - supports operation from Li-ion battery (3.0–4.2V) to industrial +5V/+10V rails |
Pinout & Package
SOT23-5 package (Texas Instruments drawing 331), 5-pin surface-mount, thermal resistance θJA = 150°C/W, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Internally unconnected; must be left floating or tied to ground per layout best practice |
| 2 (Inverting Input) | Inverting input node | Accepts feedback network; requires matched impedance to non-inverting input for offset minimization |
| 3 (Non-Inverting Input) | Non-inverting input node | DC-biased via resistor divider for level-shifting; supports input down to –0.25V at +3V supply |
| 4 (GND) | Analog ground reference | Primary return path for input bias current and output load; must connect to low-impedance ground plane |
| 5 (+VS) | Positive supply terminal | Accepts +2.7V to +10.5V; bypassing with 0.1µF ceramic capacitor directly at pin is mandatory |
| 6 (Output) | Amplifier output | Drives resistive or capacitive loads up to 1000pF; output impedance <0.2Ω below 100kHz |
Key Features
| Feature | Design Value |
|---|---|
| Wideband single-supply operation | 150MHz bandwidth at G = +2 on +5V - eliminates need for dual supplies in portable video/ADC systems |
| Ground-sensing input | Input range extends 0.25V below ground at +3V - enables direct interface to 0–0.5V sensor outputs |
| Rail-to-rail output swing | Swings to within 30mV of GND and 140mV of VS - maximizes dynamic range into 3V ADCs |
| Low distortion at high frequency | –63dBc SFDR at 5MHz, 2Vp-p - meets NTSC differential gain (0.10%) and phase (0.16°) specs |
| High output drive capability | 80mA sourcing into 150Ω - sustains 4.65V output swing driving composite video standard loads |
Applications
| Single-Supply ADC Input Buffers | Single-Supply Video Line Drivers |
|---|---|
Use Scenario: Driving 10-bit, 20Msps ADC (e.g., ADS900) from 0–0.5V sensor output on +3V rail. IC Role / Device Role / Timing Role: DC-coupled non-inverting buffer with level-shifted input bias to deliver 1–2V output swing. Use Value: Maintains 65dB SFDR at 5MHz and <15ns 0.1% settling - ensures accurate digitization without external level-shifting ICs. |
Use Scenario: Amplifying NTSC composite video signals in portable medical imagers and security cameras. IC Role / Device Role / Timing Role: Gain-of-2 line driver with 150Ω back-terminated output and AC-coupled input. Use Value: Achieves 0.10% differential gain and 0.16° differential phase error - meets broadcast video fidelity requirements. |
| Wireless LAN IF Amplifiers | CCD Imaging Channels |
Use Scenario: Intermediate-frequency amplification in 2.4GHz WLAN receivers operating from +3.3V. IC Role / Device Role / Timing Role: Fixed-gain +5 amplifier with 39MHz bandwidth at +3V supply. Use Value: Delivers –65dBc 2nd-harmonic distortion at 5MHz - suppresses LO leakage and image artifacts. |
Use Scenario: Pixel charge amplification in low-power CCD-based barcode scanners and endoscopes. IC Role / Device Role / Timing Role: Low-noise transimpedance preamplifier with 5.6nV/√Hz input voltage noise. Use Value: Enables >70dB dynamic range over 10kHz–10MHz bandwidth - preserves weak pixel signals amid readout noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, single-supply op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA635N/3K | Includes DIS pin; 0µA disabled quiescent current vs 10.8mA active; same SOT23-6 pinout except DIS added | Required where system-level power gating is needed; not pin-compatible due to extra DIS pin and 6-pin footprint | Select OPA635N/3K only if hardware-level enable/disable control is required; otherwise OPA634N/3K offers identical performance with simpler layout |
| OPA695U | Higher bandwidth (1.7GHz GBW), higher supply current (17mA), SO-8 only; no ground-sensing input (min VIN = VS–1.2V) | Better for RF IF stages >100MHz; unsuitable for sub-1V sensor interfacing due to input range limitation | Choose OPA695U when >500MHz closed-loop bandwidth is needed; avoid for DC-coupled low-voltage sensor buffers |
Compared with OPA635N/3K, OPA634N/3K eliminates disable circuitry to reduce cost and board area in always-on applications; compared with OPA695U, it trades bandwidth for ground-referenced input and lower power - making it optimal for 3–20MHz portable signal chains where input headroom and efficiency are critical.
Availability
OPA634N/3K is available at Aetrix Electronics and suitable for single-supply ADC input buffering, portable video line driving, wireless LAN IF amplification, and CCD imaging channel applications requiring stable component supply, consistent SOT23-5 packaging, and guaranteed –40°C to +85°C operation.
Supply support for OPA634N/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 precision signal chain solutions.
The OPA634N/3K belongs to TI's OPA63x family of wideband, single-supply operational amplifiers, designed specifically for DC-coupled, low-voltage signal conditioning in portable instrumentation, medical imaging, and communications infrastructure.
FAQ
What supply voltage range does the OPA634N/3K support?
The OPA634N/3K operates from +2.7V to +10.5V single supply, with guaranteed specifications at +3V and +5V. At +3V, it delivers 110MHz bandwidth (G = +2) and 2.8Vp-p output swing into 1kΩ; at +5V, bandwidth increases to 150MHz and output swing reaches 4.8V. Minimum operating voltage is strictly 2.7V - operation below this risks undefined behavior and is not characterized.
Does the OPA634N/3K have a disable pin?
No, the OPA634N/3K does not include a disable (DIS) pin. That feature is exclusive to the OPA635 variant (e.g., OPA635N/3K), which uses a 6-pin SOT23-6 package. The OPA634N/3K is a 5-pin SOT23-5 device with fixed operation and 10.8–13.5mA quiescent current across temperature - ideal for always-on signal paths where power gating is unnecessary.
What is the input voltage range of the OPA634N/3K at +3V supply?
At +3V supply, the OPA634N/3K input voltage range is specified from –0.25V (minimum) to +1.8V (maximum) at TA = 25°C, extending to –0.01V and +1.5V over full –40°C to +85°C range. This ground-sensing capability enables direct connection of 0–0.5V sensor outputs without level-shifting circuitry - a key advantage over rail-to-rail input op amps that require VIN ≥ 0V.
Can the OPA634N/3K drive a 150Ω video load?
Yes, the OPA634N/3K is explicitly characterized to drive 150Ω loads to VS/2, delivering 4.65V minimum output voltage swing on +5V supply and 2.8V on +3V supply. Its 80mA sourcing and 100mA sinking capability, combined with <0.2Ω closed-loop output impedance below 100kHz, ensures stable NTSC-compliant video drive with 0.10% differential gain and 0.16° differential phase error - verified in TI's SBOS097A datasheet.
What is the thermal resistance of the OPA634N/3K package?
The OPA634N/3K uses the SOT23-5 package (TI drawing 331) with a junction-to-ambient thermal resistance (θJA) of 150°C/W, as specified in the SBOS097A datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias. Maximum junction temperature is 175°C, limiting max ambient to +85°C at 13.5mA IQ and typical PCB layout.
OPA634N/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SpeedPlus™
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
OPA634N/3K FAQ
1.How can I place an order for OPA634N/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA634N/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 OPA634N/3K reliable?
The price and inventory of OPA634N/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA634N/3K is usually 5 days.
3.What payment methods are accepted for OPA634N/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA634N/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA634N/3K?
OPA634N/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA634N/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 OPA634N/3K?
For technical support, including OPA634N/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA634N/3K requirements.
6.How does Aetrix verify that OPA634N/3K is sourced from the original manufacturer or authorized distributors?
All OPA634N/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 OPA634N/3K meets industry standards.
7.What is the process for return or replacement of OPA634N/3K?
All OPA634N/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA634N/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 OPA634N/3K part is unused and in its original packaging.
Return procedure for OPA634N/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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