LMH6643MM/NOPB Equivalent & Substitute Parts

Part Overview

The LMH6643MM/NOPB is a voltage feedback operational amplifier manufactured by Texas Instruments, configured as a dual-circuit (2-channel) rail-to-rail amplifier in an 8-VSSOP surface mount package. This device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

The LMH6643MM/NOPB is used in applications requiring high-speed voltage feedback amplification with rail-to-rail output capability. Equivalent and substitute parts are identified based on matching functional characteristics: dual-circuit configuration, rail-to-rail output topology, compatible supply voltage ranges, surface mount packaging in 8-pin form factors, and active product status. Substitute parts must maintain electrical compatibility within the specified operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	LMH6643MM/NOPB	—
Manufacturer	Texas Instruments	—
Number of Circuits	2	—
Amplifier Type	Voltage Feedback	—
Output Type	Rail-to-Rail	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
Supplier Device Package	8-VSSOP	—
Slew Rate	135	V/µs
-3dB Bandwidth	130	MHz
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	12.8	V
Current - Output / Channel	75	mA
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the LMH6643MM/NOPB are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Dual-circuit (2-channel) configuration
Voltage feedback amplifier topology
Rail-to-rail output capability
8-pin surface mount package (8-TSSOP, 8-MSOP, or 8-uMAX/uSOP)
Supply voltage range compatibility (minimum 2.7V, maximum 11V or higher)
Active product status
RoHS3 compliance
Operating temperature range -40°C to 85°C

Substitute Parts Identified:

LT6206 Series (Analog Devices Inc.): LT6206CMS8#PBF, LT6206IMS8#PBF, LT6206IMS8#TRPBF
- Voltage feedback, dual-circuit, rail-to-rail configuration
- 8-MSOP package
- Supply voltage: 2.7V to 12.6V (single), ±1.35V to 6.3V (dual)
- Higher slew rate (600V/µs) and output current (60mA per channel)
MAX4017 Series (Analog Devices Inc./Maxim Integrated): MAX4017EUA+, MAX4017EUA+T
- Buffer/voltage feedback amplifier, dual-circuit, rail-to-rail
- 8-uMAX/uSOP package
- Supply voltage: 3.15V to 11V
- Higher slew rate (600V/µs), higher bandwidth (200MHz), higher output current (120mA per channel)
MAX4217 Series (Analog Devices Inc./Maxim Integrated): MAX4217EUA+, MAX4217EUA+T
- Buffer/voltage feedback amplifier, dual-circuit, rail-to-rail
- 8-uMAX/uSOP package
- Supply voltage: 3.15V to 11V
- Higher slew rate (600V/µs), higher bandwidth (230MHz), higher output current (120mA per channel)

All substitute parts maintain the core functional requirements: dual amplifier circuits, rail-to-rail output, surface mount 8-pin configuration, and active product status with RoHS3 compliance.

Parameter Comparison

Parameter	LMH6643MM/NOPB	LT6206CMS8#PBF	LT6206IMS8#PBF	LT6206IMS8#TRPBF	MAX4017EUA+	MAX4017EUA+T	MAX4217EUA+	MAX4217EUA+T
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Number of Circuits	2	2	2	2	2	2	2	2
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback
Output Type	Rail-to-Rail	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	600	600	600	600	600	600	600
-3dB Bandwidth (MHz)	130	—	—	—	200	200	230	230
Voltage - Supply Span Min (V)	2.7	2.7	2.7	2.7	3.15	3.15	3.15	3.15
Voltage - Supply Span Max (V)	12.8	12.6	12.6	12.6	11	11	11	11
Current - Output / Channel (mA)	75	60	60	60	120	120	120	120
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Compliance and Regulatory Status:

All identified substitute parts maintain Active product status and RoHS3 compliance, ensuring long-term availability and regulatory alignment with the LMH6643MM/NOPB. All parts carry MSL 1 (Unlimited) moisture sensitivity level and REACH Unaffected status, matching the original device's environmental and regulatory profile.

Supply Voltage Considerations:

The LMH6643MM/NOPB operates from 2.7V to 12.8V. The LT6206 series maintains the same minimum supply voltage (2.7V) with a maximum of 12.6V, providing direct compatibility across the full operating range. The MAX4017 and MAX4217 series have a higher minimum supply voltage of 3.15V and maximum of 11V, which restricts operation in applications requiring supply voltages below 3.15V or above 11V.

Performance Characteristics:

The LT6206 series offers a 4.4× increase in slew rate (600V/µs versus 135V/µs) while maintaining comparable output current (60mA per channel versus 75mA). The MAX4017 and MAX4217 series provide even higher slew rates (600V/µs) with significantly higher output current capability (120mA per channel), suitable for applications requiring higher drive capability.

Packaging and Inventory:

All substitute parts are available in 8-pin surface mount packages compatible with LMH6643MM/NOPB PCB layouts. Packaging options include Tube (standard), Tape & Reel (TR), and Digi-Reel formats. Current inventory levels are confirmed for all substitute parts, with MAX4217EUA+T showing the highest availability (3600 pcs).

Selection Basis:

Choose LT6206 series substitutes when supply voltage range below 3.15V is required or when maximum supply voltage above 11V is necessary. Choose MAX4017 or MAX4217 series when higher output current (120mA per channel) or higher bandwidth performance is required within the 3.15V to 11V supply range.

Frequently Asked Questions (FAQ)

Q1: Can the LT6206 series directly replace the LMH6643MM/NOPB without circuit modifications?

A: The LT6206 series maintains electrical compatibility with the LMH6643MM/NOPB across the overlapping supply voltage range (2.7V to 12.6V). Both are dual-circuit, rail-to-rail voltage feedback amplifiers in 8-pin surface mount packages with identical pin configurations. No circuit modifications are required for pin-compatible substitution. However, the LT6206 series exhibits higher slew rate (600V/µs versus 135V/µs), which may affect circuit behavior in applications sensitive to transient response characteristics.

Q2: What is the key difference between LT6206CMS8#PBF and LT6206IMS8#PBF?

A: Both LT6206CMS8#PBF and LT6206IMS8#PBF are functionally identical voltage feedback amplifiers with identical electrical specifications. The difference lies in packaging format: LT6206CMS8#PBF is supplied in Tube packaging, while LT6206IMS8#PBF is supplied in Tube packaging as well. LT6206IMS8#TRPBF is the Tape & Reel variant of the same device. Selection between these variants depends on assembly process requirements and quantity needs.

Q3: Why do MAX4017 and MAX4217 series have higher minimum supply voltage (3.15V) compared to LMH6643MM/NOPB (2.7V)?

A: The MAX4017 and MAX4217 series are designed with different internal circuit topologies optimized for higher performance characteristics (600V/µs slew rate, 120mA output current per channel). This design approach results in a higher minimum supply voltage requirement of 3.15V. Applications operating below 3.15V must use the LT6206 series or the original LMH6643MM/NOPB.

Q4: Are all substitute parts suitable for high-frequency applications?

A: The LT6206 series does not specify -3dB bandwidth in the provided parameters. The MAX4017 series specifies 200MHz -3dB bandwidth, and the MAX4217 series specifies 230MHz -3dB bandwidth, both exceeding the LMH6643MM/NOPB specification of 130MHz. For applications requiring bandwidth matching or lower than 130MHz, verify the LT6206 series bandwidth specifications with the manufacturer datasheet.

Q5: What packaging options are available for high-volume production?

A: For high-volume production, Tape & Reel (TR) packaging is recommended. Available TR options include LT6206IMS8#TRPBF (1900 pcs in stock), MAX4017EUA+T (962 pcs in stock), and MAX4217EUA+T (3600 pcs in stock). Tube packaging is available for lower-volume requirements with LT6206CMS8#PBF (4840 pcs) and MAX4217EUA+ (772 pcs).

Q6: Do all substitute parts maintain the same operating temperature range?

A: Yes. All identified substitute parts operate across the identical temperature range of -40°C to 85°C, matching the LMH6643MM/NOPB specification. This ensures thermal performance consistency across all equivalent and substitute devices.

Q7: Which substitute part offers the best output current capability?

A: The MAX4017 and MAX4217 series both provide 120mA output current per channel, compared to 75mA per channel for the LMH6643MM/NOPB and 60mA per channel for the LT6206 series. Applications requiring higher output drive capability should select MAX4017 or MAX4217 series substitutes.

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