LMH6643MA Equivalent & Substitute Parts

Part Overview

The LMH6643MA is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, featuring dual circuits in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LMH6643MA operates as a rail-to-rail output amplifier suitable for applications requiring high-speed signal conditioning and buffering across supply voltages from 2.7 V to 12.8 V. Equivalent and substitute parts are necessary due to product status transition and to ensure design continuity with active alternatives offering comparable or enhanced electrical performance.

Substiute Parts

LMH6643MA

Texas InstrumentsIn Stock: 20285LMH6643MA Datasheet

Current PartRFQ

LMH6643MA/NOPB

Texas InstrumentsIn Stock: 1947LMH6643MA/NOPB Datasheet

DirectRFQ

LMH6643MAX/NOPB

Texas InstrumentsIn Stock: 30400LMH6643MAX/NOPB Datasheet

MFR RecommendedRFQ

MAX4017ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 882MAX4017ESA+ Datasheet

MFR RecommendedRFQ

MAX4017ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 10345MAX4017ESA+T Datasheet

MFR RecommendedRFQ

MAX4217ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 2201MAX4217ESA+ Datasheet

MFR RecommendedRFQ

MAX4217ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1164MAX4217ESA+T Datasheet

MFR RecommendedRFQ

TSH82IDT

STMicroelectronicsIn Stock: 339511TSH82IDT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMH6643MA is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Direct Equivalents (Texas Instruments LMH6643 Series): The LMH6643MA/NOPB and LMH6643MAX/NOPB are direct functional equivalents with identical electrical specifications. These parts differ only in packaging format (Tube versus Cut Tape & Digi-Reel) and product status (Active versus Last Time Buy). Both maintain the same amplifier type, circuit count, output configuration, slew rate, bandwidth, bias current, offset voltage, supply current, output current, and supply voltage range.

Cross-Manufacturer Substitutes (Analog Devices / Maxim Integrated): The MAX4017ESA+, MAX4017ESA+T, MAX4217ESA+, and MAX4217ESA+T are buffer/voltage feedback amplifiers with enhanced electrical performance. These parts share the same package type (8-SOIC), circuit count (2), output type (Rail-to-Rail), and operating temperature range. However, they exhibit higher slew rates (600 V/µs versus 135 V/µs), higher bandwidth specifications (200–230 MHz versus 130 MHz), higher input bias current (5.4 µA versus 1.6 µA), higher input offset voltage (4 mV versus 1 mV), higher supply current (5.5 mA versus 2.7 mA per channel), and higher output current (120 mA versus 75 mA per channel). Supply voltage ranges differ: MAX40xx series operate from 3.15 V to 11 V.

Cross-Manufacturer Substitute (STMicroelectronics): The TSH82IDT is a general-purpose amplifier with automotive qualification (AEC-Q100). It shares the same package type (8-SOIC), circuit count (2), output type (Rail-to-Rail), and operating temperature range. However, it exhibits lower slew rate (118 V/µs), lower bandwidth (100 MHz), higher input bias current (6 µA), lower input offset voltage (800 µV), significantly higher supply current (9.8 mA), lower output current (55 mA per channel), and a higher minimum supply voltage (4.5 V versus 2.7 V).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LMH6643MA/NOPB or LMH6643MAX/NOPB

For direct replacement of the LMH6643MA, the LMH6643MA/NOPB and LMH6643MAX/NOPB are the preferred selections. Both parts are manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability. These parts maintain identical electrical specifications across all critical parameters: slew rate, bandwidth, input bias current, input offset voltage, supply current, output current, and supply voltage range. The only distinction is packaging format: LMH6643MA/NOPB is supplied in Tube packaging, while LMH6643MAX/NOPB is supplied in Cut Tape & Digi-Reel format. Selection between these two depends on procurement and assembly requirements. Both are ROHS3 compliant with MSL 1 rating.

Secondary Recommendation: MAX4017ESA+ or MAX4017ESA+T

The MAX4017ESA+ and MAX4017ESA+T are suitable substitutes when enhanced performance is acceptable or required. These Analog Devices / Maxim Integrated parts offer significantly higher slew rate (600 V/µs) and bandwidth (200 MHz), enabling faster signal conditioning applications. Higher output current capability (120 mA versus 75 mA) supports increased load driving capacity. However, these parts exhibit higher input bias current (5.4 µA versus 1.6 µA) and higher input offset voltage (4 mV versus 1 mV), which may impact precision analog applications. Supply voltage range is narrower (3.15 V to 11 V versus 2.7 V to 12.8 V), restricting use in ultra-low-voltage or extended high-voltage applications. Both variants are Active status with ROHS3 compliance and MSL 1 rating. Selection between MAX4017ESA+ (Tube) and MAX4017ESA+T (Tape & Reel) depends on packaging requirements.

Tertiary Recommendation: MAX4217ESA+ or MAX4217ESA+T

The MAX4217ESA+ and MAX4217ESA+T offer the highest bandwidth performance (230 MHz) among available substitutes, with identical slew rate and output current specifications to the MAX4017 series. These parts are suitable for applications requiring maximum frequency response. All other electrical and compliance characteristics match the MAX4017 series. Selection between MAX4217ESA+ (Tube) and MAX4217ESA+T (Tape & Reel) depends on packaging requirements. Both are Active status with ROHS3 compliance and MSL 1 rating.

Alternative Recommendation: TSH82IDT

The TSH82IDT from STMicroelectronics is an alternative for applications where automotive qualification is required. This part carries AEC-Q100 qualification, making it suitable for automotive and harsh-environment applications. However, it exhibits lower slew rate (118 V/µs) and lower bandwidth (100 MHz) compared to the LMH6643MA, making it unsuitable for high-speed signal conditioning. Supply current is significantly higher (9.8 mA), and output current is lower (55 mA). Minimum supply voltage is higher (4.5 V), restricting use in low-voltage applications. This part is recommended only when automotive qualification is a mandatory requirement and performance trade-offs are acceptable.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LMH6643MA with LMH6643MA/NOPB without circuit modification?

A: Yes. The LMH6643MA/NOPB is a direct functional equivalent with identical electrical specifications. The only difference is the packaging format (Tube versus the original packaging). No circuit modifications are required. Both parts are pin-compatible in the 8-SOIC package and maintain the same electrical performance across all operating conditions.

Q2: What is the difference between LMH6643MAX/NOPB and LMH6643MA/NOPB?

A: Both parts are electrically identical with the same specifications. The difference is packaging format: LMH6643MA/NOPB is supplied in Tube packaging, while LMH6643MAX/NOPB is supplied in Cut Tape & Digi-Reel format. Selection depends on your assembly process and procurement requirements. LMH6643MAX/NOPB offers higher inventory availability (30,300 pcs versus 1,866 pcs).

Q3: Can I use MAX4017ESA+ as a drop-in replacement for LMH6643MA?

A: MAX4017ESA+ is functionally compatible but not a true drop-in replacement. It offers enhanced performance (600 V/µs slew rate, 200 MHz bandwidth, 120 mA output current) but exhibits higher input bias current (5.4 µA versus 1.6 µA) and higher input offset voltage (4 mV versus 1 mV). Supply voltage range is narrower (3.15 V to 11 V). Use MAX4017ESA+ only if your application can tolerate these electrical differences and if the enhanced performance is beneficial.

Q4: Why does TSH82IDT have higher supply current than LMH6643MA?

A: The TSH82IDT is a general-purpose amplifier with different internal architecture optimized for automotive applications and AEC-Q100 qualification. Its higher supply current (9.8 mA versus 2.7 mA) reflects different design trade-offs. It is recommended only when automotive qualification is mandatory.

Q5: What is the minimum supply voltage for each substitute?

A: LMH6643MA, LMH6643MA/NOPB, and LMH6643MAX/NOPB operate from 2.7 V minimum. MAX4017ESA+, MAX4017ESA+T, MAX4217ESA+, and MAX4217ESA+T operate from 3.15 V minimum. TSH82IDT operates from 4.5 V minimum. If your application requires operation below 3.15 V, only the LMH6643 series is suitable.

Q6: Which substitute offers the best high-frequency performance?

A: The MAX4217ESA+ and MAX4217ESA+T offer the highest -3dB bandwidth at 230 MHz, compared to 130 MHz for the LMH6643MA. These parts are suitable for applications requiring maximum frequency response. However, they exhibit higher input bias current and input offset voltage.

Q7: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts—LMH6643MA/NOPB, LMH6643MAX/NOPB, MAX4017ESA+, MAX4017ESA+T, MAX4217ESA+, MAX4217ESA+T, and TSH82IDT—are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are suitable for standard PCB assembly processes.

Q8: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is used for manual assembly or small-volume production. Tape & Reel (TR) and Cut Tape & Digi-Reel (CT) formats are used for automated assembly lines. The electrical performance is identical; packaging format affects only procurement, storage, and assembly methodology.

Q9: Can I use MAX4217ESA+T instead of MAX4017ESA+T?

A: Yes. Both parts are electrically compatible with identical slew rate (600 V/µs), input bias current (5.4 µA), input offset voltage (4 mV), supply current (5.5 mA), output current (120 mA), and supply voltage range (3.15 V to 11 V). The MAX4217ESA+T offers higher bandwidth (230 MHz versus 200 MHz), making it suitable for higher-frequency applications. Both are supplied in Tape & Reel format.

Q10: Is the LMH6643MA still available for new designs?

A: No. The LMH6643MA is classified as Last Time Buy, indicating discontinued production. For new designs, use LMH6643MA/NOPB or LMH6643MAX/NOPB, which are Active status with long-term availability. Existing inventory of LMH6643MA is limited (20,182 pcs), so transition to active alternatives is recommended for design continuity.