OPA633KP Equivalent & Substitute Parts

Part Overview

The OPA633KP is a buffer amplifier integrated circuit manufactured by Texas Instruments, designed for single-circuit buffering applications. This device is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design requirements and production continuity. The OPA633KP operates across a supply voltage range of 10V to 32V with a slew rate of 2500V/µs and -3dB bandwidth of 260 MHz, making it suitable for high-speed buffering applications requiring through-hole mounting in 8-DIP packaging.

Substiute Parts

OPA633KP

Texas InstrumentsIn Stock: 2248OPA633KP Datasheet

Current PartRFQ

BUF634AIDR

Texas InstrumentsIn Stock: 37653BUF634AIDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA633KP is determined by functional equivalence across critical electrical and mechanical parameters. The primary substitute identified is the BUF634AIDR, also manufactured by Texas Instruments. Substitution logic is based on the following key parameters:

Functional Compatibility Criteria:

• Single-circuit amplifier configuration
• Buffer or general-purpose amplifier topology capable of buffering applications
• Slew rate equal to or exceeding 2500V/µs
• Bandwidth performance meeting or exceeding 260 MHz
• Output current capability equal to or exceeding 100 mA per channel
• Supply voltage range encompassing the OPA633KP operating window (10V to 32V minimum overlap)
• RoHS3 compliance and REACH unaffected status

Package and Mounting Considerations: The OPA633KP uses through-hole 8-DIP packaging. The BUF634AIDR uses surface-mount 8-SOIC packaging, requiring PCB redesign and assembly process modification. This represents a package-level substitution requiring engineering evaluation for mechanical and manufacturing compatibility.

Parameter Comparison

Engineering Selection Recommendations

The BUF634AIDR serves as the manufacturer-recommended substitute for the obsolete OPA633KP. Both devices are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Electrical Performance: The BUF634AIDR exceeds the OPA633KP in slew rate (3750V/µs versus 2500V/µs) and output current capability (250 mA versus 100 mA). The BUF634AIDR operates across a wider supply voltage range (4.5V to 36V versus 10V to 32V), providing greater design flexibility. The BUF634AIDR maintains bandwidth performance at 210 MHz, which is lower than the OPA633KP at 260 MHz but remains suitable for buffering applications within the specified frequency range.

Product Status and Availability: The OPA633KP is classified as obsolete with limited inventory availability. The BUF634AIDR is active production with substantial inventory (37,600 pieces), ensuring long-term supply continuity and component availability for production requirements.

Temperature Operating Range: The BUF634AIDR extends the operating temperature range to -40°C to 125°C, compared to the OPA633KP range of 0°C to 75°C. This provides enhanced performance across broader environmental conditions.

Package and Assembly Considerations: Substitution requires transition from through-hole 8-DIP mounting to surface-mount 8-SOIC packaging. This necessitates PCB layout modification and assembly process adjustment. The BUF634AIDR is supplied in Cut Tape and Digi-Reel packaging formats suitable for automated surface-mount assembly.

Frequently Asked Questions (FAQ)

Q: Can the BUF634AIDR directly replace the OPA633KP without PCB modification?

A: No. The OPA633KP uses through-hole 8-DIP packaging while the BUF634AIDR uses surface-mount 8-SOIC packaging. PCB redesign is required to accommodate the different package footprint and mounting technology.

Q: What are the key electrical differences between these devices?

A: The BUF634AIDR provides higher slew rate (3750V/µs versus 2500V/µs), greater output current capability (250 mA versus 100 mA), and lower supply current (8.5 mA versus 21 mA). The OPA633KP maintains higher bandwidth (260 MHz versus 210 MHz). Both devices operate within overlapping supply voltage ranges, with the BUF634AIDR supporting lower minimum voltage (4.5V versus 10V).

Q: Is the BUF634AIDR suitable for applications requiring the OPA633KP's 260 MHz bandwidth?

A: The BUF634AIDR operates at 210 MHz bandwidth. Application suitability depends on specific frequency requirements. For applications requiring bandwidth exceeding 210 MHz, alternative components may be necessary.

Q: What is the impact of the lower input bias current in the BUF634AIDR?

A: The BUF634AIDR input bias current is 30 nanoamperes compared to the OPA633KP at 15 microamperes. This represents significantly lower input bias current, which reduces loading effects on signal sources and improves circuit performance in high-impedance applications.

Q: Are both devices compliant with current regulatory standards?

A: Yes. Both the OPA633KP and BUF634AIDR are ROHS3 compliant and REACH unaffected, meeting current electronic component regulatory requirements.

Q: What is the moisture sensitivity level difference?

A: The OPA633KP has MSL 1 (unlimited shelf life), while the BUF634AIDR has MSL 2 (1-year shelf life). The BUF634AIDR requires standard moisture control during storage and handling per IPC standards.

Q: Can the BUF634AIDR operate across the full OPA633KP supply voltage range?

A: Yes. The BUF634AIDR supply range of 4.5V to 36V encompasses the OPA633KP range of 10V to 32V. The BUF634AIDR supports operation at the OPA633KP specified voltages and extends capability to lower and higher supply voltages.