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Texas Instruments BUF634F/500E3
- Part No.:
- BUF634F/500E3
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
BUF634F/500E3.pdf
- Description:
- IC BUFFER 1 CIRC DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,763
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Product details
Overview
BUF634F/500E3 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, 30–180MHz pin-selectable bandwidth, ±2.25V to ±18V dual supply operation, and internal thermal shutdown - enabling robust valve driver and ATE pin driver implementations.
For engineers reviewing the BUF634F/500E3 datasheet, BUF634F/500E3 pinout, BUF634F/500E3 application, or BUF634F/500E3 equivalent, key selection criteria include bandwidth adjustability via external resistor, quiescent current trade-off (1.5mA vs 15mA), SOIC-8 vs TO-220 package thermal performance, and output headroom under 150mA load.
Technical Context
The BUF634F/500E3 implements an open-loop complementary follower architecture with no internal feedback network, allowing direct integration inside op-amp feedback loops to boost output current without compromising stability. Its bandwidth is externally controlled by a resistor between V– and BW pin, enabling precise gain-bandwidth optimization across load conditions.
Thermal shutdown activates at 175°C junction temperature, and internal current limiting provides ±350mA to ±550mA short-circuit protection depending on operating mode. The device operates in two distinct modes: low-quiescent-current (1.5mA, 30MHz) and wide-bandwidth (15mA, 180MHz), each with validated AC/DC performance across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | ±250mA continuous - drives solenoids, motors, and video lines without external transistors |
| Slew rate | 2000V/µs - supports fast transient response in test equipment and ATE pin drivers |
| Bandwidth range | 30MHz to 180MHz - adjustable via external resistor for optimal speed-power trade-off |
| Supply voltage | ±2.25V to ±18V - compatible with legacy ±5V, ±12V, and high-voltage industrial rails |
| Quiescent current | 1.5mA (low-IQ mode) or 15mA (wide-BW mode) - enables power-sensitive portable instrumentation |
| Thermal shutdown | 175°C - protects against overtemperature failure during sustained high-current operation |
| Input offset voltage | ±30mV max - ensures DC accuracy in precision line and headphone driver applications |
Pinout & Package
BUF634F/500E3 is packaged in 5-pin TO-220 (KC) with exposed tab for thermal dissipation. Pin 1 = BW (bandwidth adjust), Pin 2 = VIN (input), Pin 3 = V– (negative supply), Pin 4 = VO (output), Pin 5 = V+ (positive supply). No internal connection on NC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BW | Bandwidth control input | Connect resistor to V– to set bandwidth from 30MHz to 180MHz; open = low-IQ mode |
| VIN | Differential input | High-impedance unity-gain input accepting ±13V linear range at ±15V supply |
| V– | Negative supply rail | Reference for BW pin and internal biasing; must be connected to negative supply |
| VO | Output | Capable of ±250mA sourcing/sinking with <2.5V headroom at 150mA load |
| V+ | Positive supply rail | Reference for internal circuitry; must be connected to positive supply |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable bandwidth | Resistor-programmable 30–180MHz range eliminates need for multiple fixed-gain buffers |
| Internal current limit | ±350mA to ±550mA protection prevents latch-up during output shorts or capacitive overload |
| Thermal shutdown | 175°C trip point with automatic recovery enables unattended operation in motor and valve drivers |
| Low quiescent current mode | 1.5mA operation preserves battery life in portable test gear while maintaining 30MHz bandwidth |
| Wide supply range | ±2.25V to ±18V supports both low-voltage portable systems and industrial ±15V infrastructure |
Applications
| Valve Driver | Solenoid Driver |
|---|---|
Use Scenario: Driving industrial pneumatic or hydraulic control valves requiring fast, high-current step response. IC Role / Device Role / Timing Role: High-current unity-gain buffer placed after DAC or op-amp to deliver ±250mA into inductive valve coils. Use Value: Eliminates thermal feedback in op-amp output stage and sustains 2000V/µs slew rate despite 100–500mH coil inductance. | Use Scenario: Actuating 24V DC solenoids in automated manufacturing equipment with rapid on/off cycling. IC Role / Device Role / Timing Role: Output current booster interfacing between microcontroller GPIO and solenoid load. Use Value: Internal current limit and thermal shutdown prevent damage during repeated inrush events; 30MHz bandwidth ensures clean turn-on edges. |
| ATE Pin Driver | Video Driver |
Use Scenario: Providing stimulus and measurement signals to DUT pins in automated test equipment with tight timing margins. IC Role / Device Role / Timing Role: High-fidelity buffer in per-pin driver channel delivering fast edge rates and low distortion. Use Value: 2000V/µs slew rate achieves <200ns settling to 0.1% for 20V steps; differential phase <0.1° at 3.58MHz enables NTSC/PAL compliance. | Use Scenario: Driving 75Ω coaxial video lines in broadcast or medical imaging systems with minimal signal degradation. IC Role / Device Role / Timing Role: Final-stage line driver amplifying composite or RGB video signals before transmission. Use Value: 180MHz wide-bandwidth mode supports >100MHz video bandwidth; 0.4% differential gain error preserves color fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unity-gain buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF634A | Higher slew rate (3750V/µs), wider bandwidth (35–210MHz), higher quiescent current (1.5–8.5mA) | Preferred for ultra-high-speed video or RF test applications where >200MHz flatness is required | Select BUF634A when 3750V/µs slew rate and 210MHz bandwidth justify higher IQ and cost premium |
| LMH6321 | Adjustable current limit, identical 110MHz bandwidth and 1800V/µs slew rate, higher IQ (11mA) | Better suited for applications requiring programmable fault current threshold, e.g., adaptive motor drivers | Choose LMH6321 when dynamic current limit configuration is needed beyond fixed BUF634F/500E3 protection |
Compared with BUF634A and LMH6321, BUF634F/500E3 offers the lowest quiescent current in low-bandwidth mode (1.5mA), widest supply range (±2.25V), and proven ruggedness in industrial valve and solenoid driver deployments - making it optimal for cost-sensitive, thermally constrained, or wide-rail applications.
Availability
BUF634F/500E3 is available at Aetrix Electronics and suitable for valve driver, solenoid driver, and ATE pin driver applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing from Texas Instruments.
Supply support for BUF634F/500E3 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 high-performance amplifier design.
The BUF634 product line was engineered for high-current, high-speed analog signal buffering in industrial automation, test equipment, and video systems - emphasizing thermal resilience, configurable bandwidth, and seamless op-amp integration.
FAQ
What is the maximum continuous output current of the BUF634F/500E3?
The BUF634F/500E3 delivers ±250mA continuous output current into resistive loads at TA = +25°C with ±15V supplies. This rating is maintained across its full operating temperature range (–40°C to +125°C) and supports sustained drive into solenoids, valves, and video lines without derating under typical PCB thermal conditions.
How does the BW pin function on the BUF634F/500E3?
The BW pin on the BUF634F/500E3 sets bandwidth by connecting an external resistor to V–. Open-circuit configures low-quiescent-current mode (30MHz); a 0Ω connection yields wide-bandwidth mode (180MHz). Resistor values between 0Ω and open enable precise 30–180MHz tuning per Figure 6-9 in the BUF634F/500E3 datasheet.
Does the BUF634F/500E3 require external compensation components?
No, the BUF634F/500E3 is internally compensated and operates stably in unity-gain, open-loop configuration without external capacitors or resistors. Its complementary follower topology eliminates phase-margin concerns common in feedback-based buffers, simplifying layout for high-speed line and motor driver designs.
What thermal protection features does the BUF634F/500E3 include?
The BUF634F/500E3 integrates thermal shutdown that activates at 175°C junction temperature, halting output conduction until die temperature falls below recovery threshold. Combined with internal current limiting (±350mA to ±550mA), this dual protection ensures reliable operation in valve drivers and ATE pin drivers subjected to repetitive overloads.
Can the BUF634F/500E3 be used in single-supply configurations?
Yes, the BUF634F/500E3 supports single-supply operation by biasing VIN and VO around mid-supply using external DC blocking or level-shifting networks. Its input common-mode range extends to within 1.6V of either rail, and output swing maintains >2V headroom at 150mA - enabling use in 5V, 12V, or 24V single-rail systems with appropriate rail-splitting.
BUF634F/500E3 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)
BUF634F/500E3 FAQ
1.How can I place an order for BUF634F/500E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF634F/500E3 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 BUF634F/500E3 reliable?
The price and inventory of BUF634F/500E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF634F/500E3 is usually 5 days.
3.What payment methods are accepted for BUF634F/500E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF634F/500E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF634F/500E3?
BUF634F/500E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF634F/500E3 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 BUF634F/500E3?
For technical support, including BUF634F/500E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF634F/500E3 requirements.
6.How does Aetrix verify that BUF634F/500E3 is sourced from the original manufacturer or authorized distributors?
All BUF634F/500E3 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 BUF634F/500E3 meets industry standards.
7.What is the process for return or replacement of BUF634F/500E3?
All BUF634F/500E3 units undergo pre-shipment inspection (PSI). If there is an issue with BUF634F/500E3, 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 BUF634F/500E3 part is unused and in its original packaging.
Return procedure for BUF634F/500E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BUF634F/500E3 Tags
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