BUF634U/2K5 Equivalent & Substitute Parts

Part Overview

The BUF634U/2K5 is a buffer amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device functions as a single-circuit buffer with a slew rate of 2000V/µs and -3dB bandwidth of 180 MHz, designed for signal buffering applications requiring high-speed operation. The BUF634U/2K5 carries a "Not For New Designs" product status, indicating that Texas Instruments no longer recommends this part for new circuit development. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to actively supported alternatives.

Substiute Parts

BUF634U/2K5

Texas InstrumentsIn Stock: 7056BUF634U/2K5 Datasheet

Current PartRFQ

BUF634AIDR

Texas InstrumentsIn Stock: 37653BUF634AIDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BUF634U/2K5 is determined by strict compatibility across the following electrical and mechanical parameters:

Mechanical Compatibility: The substitute part must use the identical 8-SOIC surface mount package (0.154", 3.90mm Width) to ensure direct board-level compatibility without layout modifications.

Electrical Compatibility: The substitute must maintain the same supply voltage range (4.5V to 36V minimum and maximum), output current capability (250 mA per channel), and single-circuit configuration. The substitute must support the same mounting type (Surface Mount) and comply with RoHS3 requirements.

Performance Considerations: While the substitute may exceed the original specifications in slew rate, bandwidth, input bias current, and supply current, it must not fall below the BUF634U/2K5 performance envelope in any critical parameter. The substitute must operate within or exceed the original operating temperature range.

The BUF634AIDR qualifies as a direct substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

The BUF634AIDR is the manufacturer-recommended substitute for the BUF634U/2K5. Selection of this substitute is based on the following engineering criteria:

Package Compatibility: Both parts use the identical 8-SOIC surface mount package, enabling direct replacement without printed circuit board redesign or layout modification.

Electrical Specifications: The BUF634AIDR maintains the same supply voltage range (4.5V to 36V) and output current capability (250 mA per channel), ensuring functional equivalence in existing circuit designs. The substitute meets or exceeds all critical electrical parameters of the original part.

Product Status and Support: The BUF634AIDR carries an "Active" product status, indicating ongoing manufacturer support, continued availability, and compliance with current industry standards. The BUF634U/2K5 "Not For New Designs" status necessitates transition to an actively supported alternative.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for electronic component procurement.

Performance Enhancement: The BUF634AIDR provides improved performance characteristics including higher slew rate (3750V/µs versus 2000V/µs), increased bandwidth (210 MHz versus 180 MHz), reduced supply current (8.5 mA versus 15 mA), and extended operating temperature range (-40 to 125°C versus -40 to 85°C), while maintaining backward compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can the BUF634AIDR be used as a direct replacement for the BUF634U/2K5 without circuit modifications?

A: Yes. The BUF634AIDR is a direct substitute. Both parts use the identical 8-SOIC surface mount package and maintain the same supply voltage range (4.5V to 36V) and output current rating (250 mA per channel). No circuit modifications are required for substitution.

Q: What are the key differences between the BUF634U/2K5 and BUF634AIDR?

A: The primary differences are product status and performance specifications. The BUF634AIDR is an active product with improved electrical characteristics: higher slew rate (3750V/µs versus 2000V/µs), greater bandwidth (210 MHz versus 180 MHz), lower supply current (8.5 mA versus 15 mA), significantly lower input bias current (30 nA versus 5 µA), and extended operating temperature range (-40 to 125°C versus -40 to 85°C). The BUF634AIDR also features improved moisture sensitivity level (MSL 2 versus MSL 3).

Q: Are there any compatibility concerns when substituting the BUF634AIDR for the BUF634U/2K5?

A: No compatibility concerns exist for standard applications. Both parts are manufactured by Texas Instruments, use the same 8-SOIC package, and support identical supply voltage ranges. The BUF634AIDR exceeds the original specifications in all performance metrics, ensuring functional compatibility in existing designs.

Q: Does the BUF634AIDR require different handling or storage procedures?

A: The BUF634AIDR has improved moisture sensitivity level (MSL 2, 1 Year) compared to the BUF634U/2K5 (MSL 3, 168 Hours), requiring less stringent moisture control during storage and handling. Standard surface mount component handling procedures apply to both parts.

Q: What is the significance of the "Not For New Designs" status of the BUF634U/2K5?

A: This status indicates that Texas Instruments no longer recommends the BUF634U/2K5 for new circuit development. Existing designs may continue using this part, but new designs should transition to the BUF634AIDR, which carries "Active" product status and receives ongoing manufacturer support.

Q: Are both parts RoHS compliant?

A: Yes. Both the BUF634U/2K5 and BUF634AIDR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement and use.