LMH6609MFX Equivalent & Substitute Parts

Part Overview

The LMH6609MFX is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The LMH6609MFX operates as a single-circuit voltage feedback amplifier suitable for applications requiring high-speed signal conditioning and amplification within the specified supply voltage range.

Substiute Parts

LMH6609MFX

Texas InstrumentsIn Stock: 2662LMH6609MFX Datasheet

Current PartRFQ

LMH6609MFX/NOPB

Texas InstrumentsIn Stock: 15152LMH6609MFX/NOPB Datasheet

DirectRFQ

MAX4104EUK+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3791MAX4104EUK+T Datasheet

MFR RecommendedRFQ

MAX4304EUK+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3770MAX4304EUK+T Datasheet

MFR RecommendedRFQ

MAX4305EUK+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3817MAX4305EUK+T Datasheet

MFR RecommendedRFQ

MAX4430EUK+T

Analog Devices Inc./Maxim IntegratedIn Stock: 4536MAX4430EUK+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMH6609MFX is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Mechanical Compatibility:

• Package / Case: SC-74A, SOT-753
• Supplier Device Package: SOT-23-5
• Mounting Type: Surface Mount

Electrical Compatibility:

• Amplifier Type: Voltage Feedback
• Number of Circuits: 1
• Operating Temperature Range: -40°C to 85°C
• Supply Voltage Range: Minimum 6V to Maximum 12V (substitute must operate within or encompass this range)

Performance Parameters (Substitution Tolerance):

• Slew Rate: 1400 V/µs (primary specification)
• -3dB Bandwidth: 900 MHz (primary specification)
• Current - Input Bias: 2 µA (primary specification)
• Voltage - Input Offset: 800 µV (primary specification)
• Current - Supply: 7 mA (primary specification)
• Current - Output / Channel: 90 mA (primary specification)

Substitute parts are grouped based on how closely their electrical parameters match the LMH6609MFX specifications. Direct equivalents maintain identical or superior performance across all key parameters. Functional substitutes provide equivalent circuit functionality with acceptable parameter variations for specific application contexts.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LMH6609MFX/NOPB

The LMH6609MFX/NOPB is the direct equivalent of the obsolete LMH6609MFX. This part maintains identical electrical specifications across all parameters: 1400 V/µs slew rate, 900 MHz bandwidth, 2 µA input bias current, 800 µV input offset voltage, 7 mA supply current, and 90 mA output current. The LMH6609MFX/NOPB is manufactured by Texas Instruments with Active product status and ROHS3 compliance, providing regulatory alignment for new designs. Packaging is identical (SOT-23-5, surface mount). This substitute is recommended for direct replacement in existing designs without circuit modification.

Secondary Substitutes: MAX4304EUK+T and MAX4305EUK+T

The MAX4304EUK+T and MAX4305EUK+T are manufactured by Analog Devices Inc./Maxim Integrated and maintain voltage feedback amplifier topology with SOT-23-5 packaging. Both devices are Active status with ROHS3 compliance.

MAX4304EUK+T: Provides 1000 V/µs slew rate (71% of LMH6609MFX) and 740 MHz bandwidth (82% of LMH6609MFX). Input bias current is 32 µA (16× higher) and input offset voltage is 1 mV (25% higher). Supply current is 20 mA (186% higher). This device is suitable for applications where the reduced slew rate and bandwidth are acceptable and where higher input bias current does not degrade circuit performance.

MAX4305EUK+T: Provides 1400 V/µs slew rate (equivalent to LMH6609MFX) but reduced -3dB bandwidth of 340 MHz (38% of LMH6609MFX). Input bias current is 32 µA and input offset voltage is 1 mV. Supply current is 20 mA. This device is suitable for lower-frequency applications where slew rate performance is critical but bandwidth requirements are reduced.

Tertiary Substitute: MAX4104EUK+T

The MAX4104EUK+T is a voltage feedback amplifier with reduced performance specifications. Slew rate is 400 V/µs (29% of LMH6609MFX) and -3dB bandwidth is 625 MHz (69% of LMH6609MFX). Input bias current is 32 µA and supply current is 20 mA. This device is suitable only for applications with relaxed speed requirements.

Not Recommended: MAX4430EUK+T

The MAX4430EUK+T is classified as a General Purpose amplifier rather than voltage feedback type. Performance specifications are significantly reduced: 100 V/µs slew rate (7% of LMH6609MFX), 180 MHz bandwidth (20% of LMH6609MFX), and 60 mA output current (67% of LMH6609MFX). Minimum supply voltage is 9 V, which does not encompass the 6 V minimum of the LMH6609MFX. This device is not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can LMH6609MFX/NOPB be used as a direct replacement for LMH6609MFX?

A: Yes. The LMH6609MFX/NOPB is electrically and mechanically identical to the LMH6609MFX. All electrical parameters, package type (SOT-23-5), and operating temperature range are equivalent. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What are the key differences between LMH6609MFX and MAX4304EUK+T?

A: The MAX4304EUK+T has lower slew rate (1000 V/µs vs. 1400 V/µs), lower bandwidth (740 MHz vs. 900 MHz), higher input bias current (32 µA vs. 2 µA), higher input offset voltage (1 mV vs. 800 µV), and higher supply current (20 mA vs. 7 mA). The MAX4304EUK+T is suitable for applications where these parameter differences are acceptable. Both devices use identical SOT-23-5 packaging and support the same operating temperature range.

Q: Can MAX4305EUK+T replace LMH6609MFX in high-frequency applications?

A: No. While MAX4305EUK+T matches the slew rate (1400 V/µs), its -3dB bandwidth is only 340 MHz compared to 900 MHz for the LMH6609MFX. This 62% reduction in bandwidth makes it unsuitable for applications requiring the full 900 MHz bandwidth of the original device. The MAX4305EUK+T is appropriate only for applications with bandwidth requirements below 340 MHz.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts listed use identical SOT-23-5 packaging (SC-74A, SOT-753 case) and surface mount mounting type. PCB footprints and land patterns are identical. No layout modifications are required for mechanical compatibility.

Q: What is the supply voltage compatibility range for substitutes?

A: The LMH6609MFX operates from 6 V to 12 V. Substitute parts have the following ranges: LMH6609MFX/NOPB (6 V to 12 V, identical), MAX4104EUK+T (7 V to 11 V), MAX4304EUK+T (7 V to 11 V), MAX4305EUK+T (7 V to 11 V), and MAX4430EUK+T (9 V to 11 V). Designs operating at 6 V supply voltage cannot use MAX4104EUK+T, MAX4304EUK+T, MAX4305EUK+T, or MAX4430EUK+T. Designs operating below 9 V cannot use MAX4430EUK+T.

Q: Why is MAX4430EUK+T not recommended as a substitute?

A: The MAX4430EUK+T is classified as a General Purpose amplifier, not a voltage feedback amplifier. Its performance specifications are substantially reduced across all key parameters: 100 V/µs slew rate (7% of original), 180 MHz bandwidth (20% of original), and 60 mA output current (67% of original). Additionally, its minimum supply voltage of 9 V does not support the 6 V minimum requirement of the LMH6609MFX. This device is fundamentally incompatible with the original specification.

Q: What compliance certifications should be considered when selecting a substitute?

A: The LMH6609MFX is RoHS non-compliant. All active substitute parts (LMH6609MFX/NOPB, MAX4104EUK+T, MAX4304EUK+T, MAX4305EUK+T, MAX4430EUK+T) are ROHS3 compliant. For new designs or production requiring RoHS compliance, any of the active substitutes satisfy this requirement. For legacy designs with no RoHS requirement, the LMH6609MFX/NOPB is the preferred choice due to identical electrical specifications.

Q: What is the inventory status of substitute parts?

A: LMH6609MFX/NOPB has 15,100 pieces in stock. MAX4104EUK+T and MAX4304EUK+T each have 3,700 pieces. MAX4305EUK+T has 3,800 pieces. MAX4430EUK+T has 4,502 pieces. All substitutes are available as new original stock in Tape & Reel packaging.