LMH6559MF Equivalent & Substitute Parts

Part Overview

The LMH6559MF is a buffer amplifier integrated circuit manufactured by Texas Instruments, designed for high-speed signal conditioning applications. This single-circuit buffer amplifier operates across a 3V to 10V supply range with a slew rate of 4580V/µs and -3dB bandwidth of 1.75 GHz, making it suitable for RF and high-frequency analog signal processing. The device is packaged in SOT-23-5 (SC-74A) surface mount configuration.

The LMH6559MF carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part number. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

LMH6559MF

Texas InstrumentsIn Stock: 1134LMH6559MF Datasheet

Current PartRFQ

LMH6559MF/NOPB

Texas InstrumentsIn Stock: 2314LMH6559MF/NOPB Datasheet

DirectRFQ

LMH6559MFX/NOPB

Texas InstrumentsIn Stock: 3314LMH6559MFX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LMH6559MF are identified based on electrical and mechanical parameter equivalence. All substitute candidates must maintain identical specifications across the following critical parameters:

• Amplifier Type: Buffer
• Number of Circuits: 1
• Slew Rate: 4580V/µs
• -3dB Bandwidth: 1.75 GHz
• Current - Input Bias: 3 µA
• Voltage - Input Offset: 3 mV
• Current - Supply: 10mA
• Current - Output / Channel: 74 mA
• Voltage - Supply Span: 3V to 10V
• Operating Temperature Range: -40°C to 85°C
• Package / Case: SC-74A, SOT-753
• Mounting Type: Surface Mount

The identified substitutes share the same base product number (LMH6559) and are differentiated only by packaging configuration and product status designation. All substitutes are manufactured by Texas Instruments and maintain full electrical and mechanical compatibility with the original LMH6559MF specification.

Parameter Comparison

Engineering Selection Recommendations

LMH6559MF/NOPB is the direct functional equivalent with identical electrical specifications and SOT-23-5 packaging. This part number carries Active product status and is available in both Cut Tape and Digi-Reel packaging configurations. The REACH Unaffected designation indicates compliance with current regulatory requirements without substance restrictions. This part is suitable for new designs and ongoing production requiring immediate availability.

LMH6559MFX/NOPB is the manufacturer-recommended substitute, also maintaining Active product status. This variant provides the same electrical performance and package compatibility. The REACH Unaffected status confirms regulatory compliance. This part number is recommended for applications requiring long-term supply assurance and represents the preferred path for design migration from the discontinued LMH6559MF.

Both substitute parts are fully compatible with existing PCB layouts and assembly processes designed for the LMH6559MF. The transition from LMH6559MF to either substitute requires no circuit modifications or design changes.

Frequently Asked Questions (FAQ)

Q: Can LMH6559MF/NOPB be used as a direct replacement for LMH6559MF?

A: Yes. LMH6559MF/NOPB is electrically and mechanically identical to LMH6559MF. All electrical parameters, operating ranges, and package specifications are equivalent. The primary difference is product status (Active versus Last Time Buy) and REACH compliance designation. No circuit modifications are required.

Q: What is the difference between LMH6559MF/NOPB and LMH6559MFX/NOPB?

A: Both parts are electrically identical with identical SOT-23-5 packaging and operating specifications. The difference lies in packaging configuration options and supply chain designation. LMH6559MFX/NOPB is designated as the manufacturer-recommended substitute. Both are Active status parts with REACH Unaffected compliance.

Q: Why is the original LMH6559MF marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued this specific part number variant. Customers are advised to transition to active alternatives (LMH6559MF/NOPB or LMH6559MFX/NOPB) to ensure continued supply availability.

Q: Are there any differences in PCB layout or assembly requirements between these part numbers?

A: No. All three part numbers use identical SOT-23-5 (SC-74A, SOT-753) packaging. PCB footprints, solder reflow profiles, and assembly processes are identical. Direct board-level substitution is possible without design modifications.

Q: What does REACH Unaffected mean for the substitute parts?

A: REACH Unaffected status indicates that the substitute parts (LMH6559MF/NOPB and LMH6559MFX/NOPB) do not contain substances of very high concern (SVHC) listed under REACH regulations, or are below the concentration threshold requiring declaration. This provides regulatory compliance assurance for applications in regulated markets.

Q: Can I mix these part numbers in the same production batch?

A: Yes. All three part numbers are electrically and mechanically equivalent. Mixing LMH6559MF, LMH6559MF/NOPB, and LMH6559MFX/NOPB in the same assembly batch presents no functional or reliability concerns. However, inventory management practices may recommend standardizing on a single active part number for traceability.

Q: Which substitute should I select for a new design?

A: LMH6559MFX/NOPB is the manufacturer-recommended substitute and represents the preferred choice for new designs. This designation indicates Texas Instruments' long-term support commitment and supply continuity assurance.