LMH6647MF Equivalent & Substitute Parts

Part Overview

The LMH6647MF is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-6 surface mount package. This device features push-pull, rail-to-rail output architecture with a 1 circuit configuration, designed for high-speed signal conditioning and amplification applications. The LMH6647MF is currently in Last Time Buy status, indicating discontinued production. Identification of equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and legacy system support.

Substiute Parts

LMH6647MF

Texas InstrumentsIn Stock: 2408LMH6647MF Datasheet

Current PartRFQ

LMH6647MF/NOPB

Texas InstrumentsIn Stock: 2732LMH6647MF/NOPB Datasheet

DirectRFQ

LMH6647MFX/NOPB

Texas InstrumentsIn Stock: 3714LMH6647MFX/NOPB Datasheet

MFR RecommendedRFQ

AD8027ARTZ-R2

Analog Devices Inc.In Stock: 107555AD8027ARTZ-R2 Datasheet

MFR RecommendedRFQ

AD8027ARTZ-REEL7

Analog Devices Inc.In Stock: 20491AD8027ARTZ-REEL7 Datasheet

MFR RecommendedRFQ

ADA4805-1ARJZ-R2

Analog Devices Inc.In Stock: 2147ADA4805-1ARJZ-R2 Datasheet

MFR RecommendedRFQ

ADA4805-1ARJZ-R7

Analog Devices Inc.In Stock: 1432ADA4805-1ARJZ-R7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LMH6647MF are classified into two functional categories based on electrical parameter compatibility:

Category 1: Direct Texas Instruments Equivalents Parts LMH6647MF/NOPB and LMH6647MFX/NOPB are direct functional equivalents manufactured by Texas Instruments. These parts maintain identical electrical specifications across all key parameters: voltage feedback amplifier type, 1 circuit configuration, push-pull rail-to-rail output, 22 V/µs slew rate, 55 MHz bandwidth, 650 nA input bias current, 1 mV input offset voltage, 725 µA supply current, and 20 mA output current per channel. Both operate across the 2.5 V to 12 V supply range and the -40°C to 85°C temperature range. The primary distinction is product status: LMH6647MF/NOPB is Active, while LMH6647MFX/NOPB is also Active with higher inventory availability.

Category 2: Analog Devices Voltage Feedback Alternatives Parts AD8027ARTZ-R2 and AD8027ARTZ-REEL7 are Analog Devices voltage feedback amplifiers in SOT-23-6 packaging. These parts share the same amplifier type (voltage feedback), circuit count (1), and output architecture (rail-to-rail). However, they exhibit enhanced electrical performance: 100 V/µs slew rate (versus 22 V/µs), 190 MHz bandwidth (versus 55 MHz), 4 µA input bias current (versus 650 nA), 200 µV input offset voltage (versus 1 mV), 6.5 mA supply current (versus 725 µA), and 120 mA output current per channel (versus 20 mA). Supply voltage range is 2.7 V to 12 V, and operating temperature extends to 125°C. These parts are suitable for applications requiring higher speed and output drive capability.

Category 3: Analog Devices General Purpose Alternatives Parts ADA4805-1ARJZ-R2 and ADA4805-1ARJZ-R7 are Analog Devices general purpose amplifiers in SOT-23-6 packaging. While classified as general purpose rather than voltage feedback, they maintain single-circuit, rail-to-rail output configuration in the same package. Performance specifications include 160 V/µs slew rate, 105 MHz bandwidth, 470 nA input bias current, 9 µV input offset voltage, 500 µA supply current, and 73 mA output current per channel. Supply voltage range is 3 V to 10 V, with operating temperature to 125°C. These parts are applicable to designs where general purpose amplifier topology is acceptable and higher bandwidth is beneficial.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance)

LMH6647MF/NOPB and LMH6647MFX/NOPB are the primary substitutes when electrical specifications must remain unchanged. Both parts are Active status products manufactured by Texas Instruments with ROHS3 compliance and unlimited moisture sensitivity rating. LMH6647MFX/NOPB offers higher inventory availability (3674 pcs) compared to LMH6647MF/NOPB (2700 pcs), making it the preferred choice for new production allocations. Both parts maintain the identical 22 V/µs slew rate, 55 MHz bandwidth, and 20 mA output current specification of the original LMH6647MF.

For Enhanced Performance Applications

AD8027ARTZ-R2 and AD8027ARTZ-REEL7 are suitable substitutes when application requirements permit higher bandwidth and slew rate performance. These Analog Devices parts deliver 100 V/µs slew rate and 190 MHz bandwidth, providing 4.5× and 3.5× performance improvement respectively. Output current capability increases to 120 mA per channel. Both variants are Active status with ROHS3 compliance. AD8027ARTZ-R2 is available in Cut Tape & Digi-Reel® packaging with 107473 pcs inventory, while AD8027ARTZ-REEL7 provides 20465 pcs. These parts are applicable to designs where signal fidelity and transient response are critical. Supply voltage minimum increases to 2.7 V, and operating temperature extends to 125°C.

For General Purpose Amplifier Designs

ADA4805-1ARJZ-R2 and ADA4805-1ARJZ-R7 are applicable when general purpose amplifier topology is acceptable and bandwidth requirements exceed 55 MHz. These parts provide 160 V/µs slew rate, 105 MHz bandwidth, and 73 mA output current per channel. Input offset voltage is significantly lower at 9 µV. Both are Active status with ROHS3 compliance. ADA4805-1ARJZ-R2 provides 2100 pcs inventory, while ADA4805-1ARJZ-R7 offers 1402 pcs. Supply voltage range is 3 V to 10 V, limiting applicability to designs not requiring 2.5 V minimum operation. Operating temperature extends to 125°C.

Frequently Asked Questions (FAQ)

Q: Can LMH6647MF/NOPB be used as a direct replacement for LMH6647MF?

A: Yes. LMH6647MF/NOPB is a direct functional equivalent with identical electrical specifications. The primary difference is product status: LMH6647MF is Last Time Buy while LMH6647MF/NOPB is Active. Both maintain 22 V/µs slew rate, 55 MHz bandwidth, 650 nA input bias current, and 20 mA output current per channel across the 2.5 V to 12 V supply range.

Q: What is the difference between LMH6647MFX/NOPB and LMH6647MF/NOPB?

A: Electrical specifications are identical. Both are Texas Instruments voltage feedback amplifiers in SOT-23-6 packaging with Active product status. The distinction is inventory availability: LMH6647MFX/NOPB has 3674 pcs in stock versus 2700 pcs for LMH6647MF/NOPB, making LMH6647MFX/NOPB preferable for high-volume production.

Q: Can AD8027ARTZ-R2 replace LMH6647MF in all applications?

A: AD8027ARTZ-R2 is electrically compatible in terms of package, circuit count, and rail-to-rail output architecture. However, performance characteristics differ significantly: 100 V/µs slew rate versus 22 V/µs, 190 MHz bandwidth versus 55 MHz, and 120 mA output current versus 20 mA. Substitution is valid only when application requirements permit these enhanced specifications or when higher bandwidth is beneficial. Supply voltage minimum increases to 2.7 V.

Q: What are the packaging differences between substitute parts?

A: All substitute parts use SOT-23-6 surface mount packaging, ensuring mechanical and electrical pin compatibility. Packaging variants differ in tape format: LMH6647MF/NOPB and LMH6647MFX/NOPB are supplied in Tape & Reel (TR) format, while AD8027ARTZ-R2, AD8027ARTZ-REEL7, ADA4805-1ARJZ-R2, and ADA4805-1ARJZ-R7 are supplied in Cut Tape (CT) & Digi-Reel® format. Both formats are compatible with standard surface mount assembly equipment.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—LMH6647MF/NOPB, LMH6647MFX/NOPB, AD8027ARTZ-R2, AD8027ARTZ-REEL7, ADA4805-1ARJZ-R2, and ADA4805-1ARJZ-R7—are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the temperature operating range difference between LMH6647MF and Analog Devices substitutes?

A: LMH6647MF operates from -40°C to 85°C. AD8027ARTZ variants and ADA4805-1ARJZ variants extend the upper temperature limit to 125°C, providing 40°C additional thermal margin. This extended range is beneficial for applications in elevated ambient or high-power environments.

Q: Can ADA4805-1ARJZ-R2 be used in a 2.5 V supply application?

A: No. ADA4805-1ARJZ-R2 requires minimum 3 V supply voltage, whereas LMH6647MF operates at 2.5 V minimum. Applications requiring 2.5 V operation must use LMH6647MF, LMH6647MF/NOPB, LMH6647MFX/NOPB, or AD8027ARTZ variants (2.7 V minimum).

Q: What is the input bias current difference between LMH6647MF and AD8027ARTZ-R2?

A: LMH6647MF specifies 650 nA input bias current. AD8027ARTZ-R2 specifies 4 µA (4000 nA), representing approximately 6× higher bias current. This difference may affect circuit performance in high-impedance input applications. ADA4805-1ARJZ variants specify 470 nA, which is lower than LMH6647MF.

Q: Are there inventory considerations for part selection?

A: Yes. LMH6647MFX/NOPB offers the highest inventory (3674 pcs), followed by AD8027ARTZ-R2 (107473 pcs). For applications where supply continuity is critical, AD8027ARTZ-R2 provides the largest available stock. LMH6647MF/NOPB (2700 pcs), AD8027ARTZ-REEL7 (20465 pcs), ADA4805-1ARJZ-R2 (2100 pcs), and ADA4805-1ARJZ-R7 (1402 pcs) have more limited availability.