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Texas Instruments BUF634FKTTT
- Part No.:
- BUF634FKTTT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
BUF634FKTTT.pdf
- Description:
- IC BUFFER 1 CIRC DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
BUF634FKTTT from Texas Instruments is a unity-gain, open-loop high-speed buffer IC designed for current-boosting and capacitive load driving in precision analog signal paths. It delivers 250mA continuous output current, 2000V/µs slew rate, and pin-selectable bandwidth from 30MHz to 180MHz, enabling robust video driver, solenoid driver, and op amp current booster applications.
For engineers reviewing the BUF634FKTTT datasheet, BUF634FKTTT pinout, BUF634FKTTT application, or BUF634FKTTT equivalent, key selection criteria include thermal shutdown protection (175°C), ±2.25V to ±18V dual-supply operation, internal current limiting, low-quiescent-current mode (1.5mA), and TO-263 (KTT) package compatibility with high-power PCB layouts.
Technical Context
The BUF634FKTTT implements an open-loop complementary follower architecture with externally adjustable bandwidth via resistor connection between V– and BW pin. Its output stage features internal current limiting and thermal shutdown circuitry, ensuring ruggedness under overload and high-temperature conditions without external protection components.
It operates in two distinct modes: low-quiescent-current mode (1.5mA, 30MHz BW) and wide-bandwidth mode (15mA, 180MHz BW), both supporting ±250mA output drive into resistive loads and stable operation with up to 1nF capacitive loads-verified across –40°C to +125°C ambient temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | ±250mA continuous - drives heavy loads like solenoids, motors, or video lines without external transistors |
| Slew rate | 2000V/µs - enables fast transient response for pulse and video signals with minimal distortion |
| Bandwidth | 30MHz to 180MHz (pin-selectable) - supports trade-off between speed and power consumption per application need |
| Supply voltage | ±2.25V to ±18V - accommodates low-voltage portable systems and high-voltage industrial rails |
| Quiescent current | 1.5mA (low-IQ mode) - minimizes standby power in battery-sensitive designs |
| Thermal shutdown | 175°C junction temperature - autonomous protection prevents latch-up or permanent damage during overload |
| Input impedance | 1400MΩ || 5pF (low-IQ mode) - preserves signal integrity in high-Z sensor or DAC output interfaces |
Pinout & Package
BUF634FKTTT uses the 5-pin TO-263 (KTT) surface-mount plastic power package (10.16mm × 15.24mm), optimized for high thermal dissipation in compact PCB layouts. The exposed metal pad on the bottom provides low RθJC(bot) = 2.4°C/W for efficient heat transfer to copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts up to +18V; powers internal bias and output stage; requires local 0.1µF bypass capacitor |
| V– | Negative supply input | Accepts down to –18V; referenced for BW pin resistor connection and thermal shutdown threshold |
| VIN | Buffer input | High-impedance unity-gain node; connects directly to op amp output or DAC; no feedback required |
| VO | Buffer output | Low-impedance, current-boosted replica of VIN; capable of sourcing/sinking ±250mA continuously |
| BW | Bandwidth control input | Connects to V– via resistor to set quiescent current and bandwidth; open = 30MHz/1.5mA, 0Ω = 180MHz/15mA |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable bandwidth | Resistor-programmable from 30MHz to 180MHz - eliminates need for multiple part numbers across speed tiers |
| Internal current limit | ±350mA to ±550mA short-circuit protection - avoids external current-sense resistors and reduces BOM count |
| Thermal shutdown | 175°C automatic cutoff with hysteresis - ensures safe recovery after overtemperature events without system-level intervention |
| Unity-gain stability | No external compensation required - simplifies layout and guarantees stability into 1nF capacitive loads |
| Wide supply range | ±2.25V to ±18V operation - supports single-supply (4.5V–36V total) and split-rail configurations in mixed-signal systems |
Applications
| Valve Driver | Solenoid Driver |
|---|---|
Use Scenario: Driving industrial pneumatic valves requiring fast turn-on/turn-off with 100–200mA peak current. IC Role / Device Role / Timing Role: High-current, low-latency buffer placed between microcontroller GPIO and valve coil interface. Use Value: Delivers 250mA at 2000V/µs slew rate to achieve sub-100ns edge transitions, reducing valve response time by >40% versus standard op amps. | Use Scenario: Controlling automotive fuel injectors or HVAC actuators with pulsed 150mA loads. IC Role / Device Role / Timing Role: Current-boosting buffer isolating sensitive MCU outputs from inductive kickback. Use Value: Internal current limit and thermal shutdown prevent latch-up during coil flyback, eliminating need for external TVS or clamping diodes. |
| Op Amp Current Booster | Video Driver |
Use Scenario: Extending output drive capability of precision op amps (e.g., OPA2810) into low-impedance loads. IC Role / Device Role / Timing Role: Open-loop unity-gain buffer inserted inside op amp feedback loop to increase available output current. Use Value: Eliminates thermal feedback errors and improves capacitive load drive - maintains 0.1% settling in <200ns with 100Ω/100pF loads. | Use Scenario: Driving 75Ω coaxial video lines in broadcast equipment or medical imaging displays. IC Role / Device Role / Timing Role: Final-stage line driver delivering full-swing analog video with minimal differential gain/phase error. Use Value: Achieves 0.4% differential gain and 0.1° differential phase at 3.58MHz (NTSC) in wide-bandwidth mode - meets SMPTE 253M compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unity-gain, high-current buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF634A | Higher slew rate (3750V/µs), wider bandwidth (35–210MHz), higher IQ range (1.5–8.5mA) | Preferred for >100MHz signal chains and ultra-low-distortion video; not drop-in due to different BW pin behavior | Select BUF634A when 2000V/µs is insufficient and layout allows updated resistor network for BW control |
| LMH6321 | Fixed 110MHz bandwidth, adjustable current limit, higher quiescent current (11mA), lower noise (2.8nV/√Hz) | Better suited for fixed-speed, low-noise instrumentation; lacks pin-selectable BW and thermal shutdown | Choose LMH6321 only if precise current limiting is required and thermal protection is implemented externally |
Compared with BUF634FKTTT, BUF634A offers superior speed and noise performance but requires revised bandwidth-setting design, while LMH6321 trades programmability and integrated protection for fixed high-fidelity operation - making BUF634FKTTT the optimal choice for thermally demanding, variable-speed industrial drivers.
Availability
BUF634FKTTT is available at Aetrix Electronics and suitable for valve driver, solenoid driver, op amp current booster, and video driver applications requiring stable component supply, long-term industrial lifecycle support, and consistent TO-263 thermal performance.
Supply support for BUF634FKTTT 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 amplifiers and precision signal-chain solutions.
BUF634FKTTT belongs to TI's high-speed buffer product line, engineered specifically for current-boosting, capacitive-load driving, and rugged industrial interface applications where reliability under thermal stress is critical.
FAQ
What is the maximum continuous output current of the BUF634FKTTT?
The BUF634FKTTT delivers ±250mA continuous output current into resistive loads at TA = 25°C and VS = ±15V. This rating is maintained across its full operating temperature range (–40°C to +125°C), with short-circuit current limited to ±350mA to ±550mA depending on quiescent current mode - verified per TI SBOS030C datasheet Section 6.5.
How does the BW pin function on the BUF634FKTTT?
The BW pin on the BUF634FKTTT sets quiescent current and bandwidth by connecting a resistor between BW and V–. An open connection yields 1.5mA IQ and 30MHz bandwidth; a 0Ω connection yields 15mA IQ and 180MHz bandwidth. Resistor values between ∞ and 0Ω linearly scale both parameters - detailed in Figure 6-9 and Section 7.4 of the BUF634FKTTT datasheet.
Does the BUF634FKTTT require external compensation for stability?
No, the BUF634FKTTT is unity-gain stable without external compensation. It maintains stability into capacitive loads up to 1nF in both low-IQ and wide-BW modes, as confirmed by gain/phase plots in Figures 6-5 through 6-6 and 6-23 through 6-24 of the official datasheet. No feedback network or isolation resistor is needed for typical 75Ω or 100Ω line-driving applications.
What thermal protection features does the BUF634FKTTT include?
The BUF634FKTTT integrates autonomous thermal shutdown that activates at 175°C junction temperature, with built-in hysteresis for safe recovery. This protection operates independently of supply voltage or load condition and is validated across all packages - including the KTT TO-263 variant used in BUF634FKTTT - per Absolute Maximum Ratings Table 6.1 and Thermal Information Table 6.4.
Can the BUF634FKTTT operate from a single supply?
Yes, the BUF634FKTTT supports single-supply operation within a total voltage range of 4.5V to 36V (±2.25V to ±18V). When used with single-ended supplies, V– is connected to ground or a reference voltage, and VIN/VO swing relative to that reference - as demonstrated in typical applications (Section 8.2) and recommended operating conditions (Section 6.3) of the BUF634FKTTT datasheet.
BUF634FKTTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Amplifier Type:
- Buffer
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2000V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 180 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 30 mV
- Current - Supply:
- 15mA
- Current - Output / Channel:
- 250 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
BUF634FKTTT FAQ
1.How can I place an order for BUF634FKTTT through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF634FKTTT 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 BUF634FKTTT reliable?
The price and inventory of BUF634FKTTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF634FKTTT is usually 5 days.
3.What payment methods are accepted for BUF634FKTTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF634FKTTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF634FKTTT?
BUF634FKTTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF634FKTTT 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 BUF634FKTTT?
For technical support, including BUF634FKTTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF634FKTTT requirements.
6.How does Aetrix verify that BUF634FKTTT is sourced from the original manufacturer or authorized distributors?
All BUF634FKTTT 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 BUF634FKTTT meets industry standards.
7.What is the process for return or replacement of BUF634FKTTT?
All BUF634FKTTT units undergo pre-shipment inspection (PSI). If there is an issue with BUF634FKTTT, 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 BUF634FKTTT part is unused and in its original packaging.
Return procedure for BUF634FKTTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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