LMH6643MM Equivalent & Substitute Parts

Part Overview

The LMH6643MM is a voltage feedback operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) rail-to-rail output device in an 8-VSSOP surface mount package. This component operates across a supply voltage range of 2.7 V to 12.8 V with an operating temperature range of -40°C to 85°C.

The LMH6643MM carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part number. Equivalent substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback
Number of Circuits	2
Output Type	Rail-to-Rail
Slew Rate	135	V/µs
-3dB Bandwidth	130	MHz
Current - Input Bias	1.6	µA
Voltage - Input Offset	1	mV
Current - Supply (per channel)	2.7	mA
Current - Output / Channel	75	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	12.8	V
Operating Temperature	-40 to 85	°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LMH6643MM is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback
Number of Circuits: 2
Output Type: Rail-to-Rail
Package / Case: 8-TSSOP or 8-MSOP (0.118", 3.00mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C minimum
Voltage Supply Span: Minimum 2.7 V to maximum 12.8 V

Secondary Compatibility Parameters:

Slew Rate: 135 V/µs or higher
-3dB Bandwidth: 130 MHz or higher
Current - Input Bias: 1.6 µA or lower
Voltage - Input Offset: 1 mV or lower
Current - Output / Channel: 75 mA or higher
Current - Supply: 2.7 mA per channel or lower

Substitute parts are grouped into two categories:

Category 1: Direct Texas Instruments LMH6643 Series Variants These parts share identical electrical specifications and differ only in packaging format or product status designation. They are sourced from the same manufacturer and product line.

Category 2: Cross-Manufacturer Alternatives These parts are sourced from Analog Devices Inc. and Maxim Integrated. They meet or exceed the primary substitution criteria and operate within compatible electrical parameter ranges. These alternatives provide enhanced performance in specific parameters while maintaining functional compatibility.

Parameter Comparison

Parameter	LMH6643MM	LMH6643MM/NOPB	LMH6643MMX/NOPB	LT6206CMS8#PBF	LT6206IMS8#PBF	MAX4017EUA+	MAX4217EUA+
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback
Number of Circuits	2	2	2	2	2	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	135	135	135	600	600	600	600
-3dB Bandwidth (MHz)	130	130	130	Not specified	Not specified	200	230
Current - Input Bias (µA)	1.6	1.6	1.6	Not specified	Not specified	5.4	5.4
Voltage - Input Offset (mV)	1	1	1	Not specified	Not specified	4	4
Current - Supply (mA)	2.7	2.7	2.7	4	4	5.5	5.5
Current - Output / Channel (mA)	75	75	75	60	60	120	120
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	3.15 V	3.15 V
Voltage - Supply Span (Max)	12.8 V	12.8 V	12.8 V	12.6 V	12.6 V	11 V	11 V
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C
Package / Case	8-VSSOP	8-VSSOP	8-VSSOP	8-MSOP	8-MSOP	8-uMAX/uSOP	8-uMAX/uSOP
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1: Direct Substitutes (Recommended for Immediate Replacement)

LMH6643MM/NOPB and LMH6643MMX/NOPB are the primary recommended substitutes. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications to the LMH6643MM. The key advantage is that both parts carry Active product status, ensuring long-term availability and continued manufacturing support. These variants differ only in packaging format (Cut Tape & Digi-Reel vs. standard distribution) and internal marking designations. Inventory levels for both parts exceed 18,000 units, providing supply security.

Tier 2: Cross-Manufacturer Alternatives (For Enhanced Performance or Specific Applications)

The LT6206 series (LT6206CMS8#PBF and LT6206IMS8#PBF) from Analog Devices Inc. provides enhanced slew rate performance (600 V/µs versus 135 V/µs) and higher output current capability (120 mA versus 75 mA). These parts maintain compatibility with the primary substitution criteria and operate within the required supply voltage and temperature ranges. The LT6206 series is suitable for applications requiring higher bandwidth performance or increased output drive capability.

The MAX4017EUA+ and MAX4217EUA+ series from Maxim Integrated offer the highest bandwidth performance (200 MHz and 230 MHz respectively) and maximum output current (120 mA). These parts are classified as Buffer, Voltage Feedback amplifiers and provide enhanced performance characteristics. The MAX4217EUA+ series delivers the highest -3dB bandwidth specification at 230 MHz. Both MAX series parts maintain Active product status with inventory availability exceeding 700 units.

Compliance and Certification Alignment

All substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance profile of the LMH6643MM. All parts maintain MSL Rating 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001, maintaining consistent regulatory and tariff classification.

Frequently Asked Questions (FAQ)

Q: Can LMH6643MM/NOPB be used as a direct replacement for LMH6643MM?

A: Yes. LMH6643MM/NOPB is a direct substitute with identical electrical specifications. The primary difference is product status: LMH6643MM is Last Time Buy, while LMH6643MM/NOPB is Active. Both parts are manufactured by Texas Instruments and packaged in 8-VSSOP format. The /NOPB designation indicates lead-free (Pb-free) compliance. Inventory availability for LMH6643MM/NOPB is significantly higher (18,238 units versus 1,905 units).

Q: What is the difference between LMH6643MM/NOPB and LMH6643MMX/NOPB?

A: Both parts share identical electrical specifications and packaging format (8-VSSOP). The difference lies in internal marking and distribution channel. LMH6643MMX/NOPB carries Active product status with the highest inventory level (52,578 units). Both parts are suitable for new production designs and field replacements.

Q: Can LT6206 series parts replace LMH6643MM in all applications?

A: LT6206 series parts meet the primary substitution criteria (dual-channel, voltage feedback, rail-to-rail, 8-MSOP package, -40°C to 85°C operating range). However, the LT6206 series exhibits higher slew rate (600 V/µs versus 135 V/µs) and higher supply current (4 mA versus 2.7 mA). Applications sensitive to power consumption or requiring specific slew rate characteristics should evaluate these differences. The LT6206 series is suitable for high-speed signal processing applications.

Q: What are the package compatibility considerations?

A: The LMH6643MM is supplied in 8-VSSOP package format. Substitute parts are available in 8-VSSOP (LMH6643 variants), 8-MSOP (LT6206 variants), and 8-uMAX/uSOP (MAX4017 and MAX4217 variants). All packages maintain identical pin count (8 pins) and 0.118" (3.00mm) width specification. PCB layout and footprint compatibility must be verified before substitution, as package body dimensions may differ slightly between VSSOP, MSOP, and uMAX formats.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant certification, matching the environmental compliance profile of the LMH6643MM. All parts are lead-free (Pb-free) and suitable for applications requiring RoHS compliance.

Q: What is the supply voltage compatibility range for substitute parts?

A: The LMH6643MM operates across 2.7 V to 12.8 V supply span. LT6206 series parts operate across 2.7 V to 12.6 V (single supply) or ±1.35 V to 6.3 V (dual supply). MAX4017 and MAX4217 series parts operate across 3.15 V to 11 V. Applications requiring operation below 3.15 V should use LMH6643 variants or LT6206 series. Applications requiring operation above 12.6 V should use LMH6643 variants.

Q: Which substitute part offers the best performance for high-frequency applications?

A: MAX4217EUA+ and MAX4217EUA+T deliver the highest -3dB bandwidth specification at 230 MHz, compared to 130 MHz for LMH6643MM and unspecified bandwidth for LT6206 series. MAX4217 series parts also provide 600 V/µs slew rate and 120 mA output current per channel. These specifications make MAX4217 series suitable for high-frequency signal conditioning and video amplification applications.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging (indicated by suffix without "T") is suitable for manual assembly and lower-volume production. Tape & Reel packaging (indicated by "TR" or "+T" suffix) is optimized for automated pick-and-place assembly equipment and high-volume production. Electrical specifications are identical between packaging formats. Selection depends on manufacturing process requirements and assembly equipment capabilities.

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