LMH6682MMX Equivalent & Substitute Parts

Part Overview

The LMH6682MMX is a voltage feedback operational amplifier featuring dual circuits in an 8-VSSOP surface mount package, manufactured by Texas Instruments. This device is classified as obsolete, though 1,938 units remain in current inventory. The LMH6682MMX operates across a 3V to 12V supply range with a slew rate of 940V/µs and gain bandwidth product of 120 MHz, designed for applications requiring moderate-speed precision amplification in compact form factors.

Due to its obsolete product status, identification of equivalent and substitute parts is necessary for design continuity, long-term supply chain planning, and new design implementations. Substitute parts are selected based on matching electrical performance parameters, compatible packaging, and active product status where available.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	2	—
Slew Rate	940	V/µs
Gain Bandwidth Product	120	MHz
-3dB Bandwidth	190	MHz
Current - Input Bias	5	µA
Voltage - Input Offset	1	mV
Current - Supply	6.5 (x2 Channels)	mA
Current - Output / Channel	85	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	-40 to 85	°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the LMH6682MMX are categorized into three groups based on substitution type and electrical compatibility:

Group 1: Direct Manufacturer Equivalent The LMH6682MMX/NOPB is the direct equivalent from Texas Instruments, differing only in packaging format (Tape & Reel versus bulk). This part maintains identical electrical specifications and is classified as Active product status, providing improved supply chain continuity compared to the obsolete base part.

Group 2: Parametric Equivalent The LMH6682MM/NOPB from National Semiconductor provides parametric equivalence with identical electrical performance across all critical parameters: slew rate (940V/µs), gain bandwidth product (120 MHz), supply voltage range (3V to 12V), and operating temperature range (-40°C to 85°C). This part is Active and available in bulk packaging.

Group 3: Manufacturer Recommended Substitutes The AD8058ARMZ, AD8058ARMZ-REEL, AD8058ARMZ-REEL7 (Analog Devices) and LT1819 series variants (LT1819CMS8#PBF, LT1819CMS8#TRPBF, LT1819IMS8#PBF, LT1819IMS8#TRPBF) represent functional alternatives with enhanced performance characteristics. These parts maintain compatibility across supply voltage range (3V to 12V), operating temperature, and package form factor, while offering improved specifications in slew rate and bandwidth.

Substitution Criteria:

Dual-circuit configuration (2 circuits per package)
8-pin surface mount package (8-MSOP or 8-VSSOP)
Supply voltage range: 3V to 12V minimum
Operating temperature: -40°C to 85°C minimum
Voltage feedback amplifier topology
Output current capability: ≥70 mA per channel

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	-3dB BW (MHz)	Input Bias (µA)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	RoHS Status
LMH6682MMX	Texas Instruments	Obsolete	940	120	190	5	6.5	85	-40 to 85	Non-compliant
LMH6682MMX/NOPB	Texas Instruments	Active	940	120	190	5	6.5	85	-40 to 85	ROHS3 Compliant
LMH6682MM/NOPB	National Semiconductor	Active	940	120	190	5	6.5	85	-40 to 85	—
AD8058ARMZ	Analog Devices Inc.	Active	1150	100	325	0.5	14	85	-40 to 85	ROHS3 Compliant
AD8058ARMZ-REEL	Analog Devices Inc.	Active	1150	100	325	0.5	14	85	-40 to 85	ROHS3 Compliant
AD8058ARMZ-REEL7	Analog Devices Inc.	Active	1150	100	325	0.5	14	85	-40 to 85	ROHS3 Compliant
LT1819CMS8#PBF	Analog Devices Inc.	Active	2500	400	—	2	9	70	0 to 70	ROHS3 Compliant
LT1819CMS8#TRPBF	Analog Devices Inc.	Active	2500	400	—	2	9	70	0 to 70	ROHS3 Compliant
LT1819IMS8#PBF	Analog Devices Inc.	Active	2500	400	—	2	9	70	-40 to 85	ROHS3 Compliant
LT1819IMS8#TRPBF	Analog Devices Inc.	Active	2500	400	—	2	9	70	-40 to 85	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select LMH6682MMX/NOPB when available inventory and supply chain requirements permit. This part provides identical electrical performance to the obsolete LMH6682MMX while offering Active product status and ROHS3 compliance. The only difference is packaging format (Tape & Reel), which does not affect electrical function.

For Parametric Equivalence: The LMH6682MM/NOPB from National Semiconductor serves as a parametric equivalent with identical electrical specifications. This option is suitable when LMH6682MMX/NOPB availability is constrained. Both parts maintain the same slew rate, bandwidth, and supply current characteristics.

For Enhanced Performance Applications: The AD8058ARMZ series (AD8058ARMZ, AD8058ARMZ-REEL, AD8058ARMZ-REEL7) offers superior slew rate (1150V/µs versus 940V/µs) and extended -3dB bandwidth (325 MHz versus 190 MHz), with reduced input bias current (0.5 µA versus 5 µA). These parts are suitable for applications requiring higher speed performance while maintaining the 3V to 12V supply range and -40°C to 85°C operating temperature compatibility. Increased supply current (14 mA versus 6.5 mA) must be evaluated in power-constrained designs.

For General Purpose Applications with Extended Bandwidth: The LT1819 series (LT1819CMS8#PBF, LT1819CMS8#TRPBF, LT1819IMS8#PBF, LT1819IMS8#TRPBF) provides significantly enhanced performance with 2500V/µs slew rate and 400 MHz gain bandwidth product. The LT1819IMS8 variants support the full -40°C to 85°C temperature range, matching the original part's thermal specification. Note that LT1819CMS8 variants are limited to 0°C to 70°C operation. These parts are classified as General Purpose amplifiers rather than Voltage Feedback topology, requiring circuit design verification for compatibility.

Compliance Considerations: All recommended substitute parts are ROHS3 compliant and REACH unaffected, addressing regulatory requirements not met by the obsolete LMH6682MMX. Designs requiring RoHS non-compliant components must retain the original part number.

Frequently Asked Questions (FAQ)

Q: Can the LMH6682MMX/NOPB be used as a direct replacement for LMH6682MMX?

A: Yes. The LMH6682MMX/NOPB is the direct equivalent, differing only in packaging format (Tape & Reel versus bulk). All electrical parameters, pin configuration, and functional characteristics are identical. The primary advantage is Active product status and ROHS3 compliance.

Q: What is the key difference between the AD8058ARMZ variants (ARMZ, ARMZ-REEL, ARMZ-REEL7)?

A: The three AD8058ARMZ variants are electrically identical. The differences are packaging and delivery format: ARMZ is supplied in Tube, ARMZ-REEL in standard reel format, and ARMZ-REEL7 in Digi-Reel format. Selection depends on procurement and assembly requirements, not electrical performance.

Q: Can LT1819 series parts replace LMH6682MMX in all applications?

A: LT1819 parts are functionally compatible in terms of package, pin count, and supply voltage range. However, they are classified as General Purpose amplifiers rather than Voltage Feedback topology. Circuit design verification is required to confirm compatibility with specific application requirements. The LT1819IMS8 variants support the full -40°C to 85°C temperature range, while LT1819CMS8 variants are limited to 0°C to 70°C.

Q: What are the supply current implications when switching to AD8058ARMZ?

A: The AD8058ARMZ draws 14 mA total supply current compared to 6.5 mA for the LMH6682MMX. This 2.15× increase must be evaluated in power-constrained designs. Thermal management and power supply capacity should be reassessed for the substitute part.

Q: Are all substitute parts available in the same 8-VSSOP package as the original?

A: The substitute parts use 8-MSOP or 8-TSSOP packages, which are mechanically and electrically compatible with 8-VSSOP. All parts maintain the same 0.118" (3.00mm) width and pin pitch, ensuring PCB layout compatibility without redesign.

Q: Which substitute part offers the best performance upgrade?

A: The LT1819IMS8 variants provide the most significant performance enhancement with 2500V/µs slew rate and 400 MHz gain bandwidth product, compared to 940V/µs and 120 MHz for the original part. The LT1819IMS8#PBF and LT1819IMS8#TRPBF support the full -40°C to 85°C operating range, matching the original specification.

Q: Is the LMH6682MM/NOPB from National Semiconductor still in production?

A: Yes, the LMH6682MM/NOPB is classified as Active product status with 1,234 units in current inventory. This part provides parametric equivalence with identical electrical specifications and serves as a viable alternative when LMH6682MMX/NOPB availability is limited.

Q: What compliance certifications apply to substitute parts?

A: All recommended substitute parts are ROHS3 compliant and REACH unaffected. The original LMH6682MMX is RoHS non-compliant. Designs requiring regulatory compliance should transition to substitute parts. All parts carry EAR99 export classification and HTSUS code 8542.33.0001.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: LMH6682MMX/NOPB and LMH6682MM/NOPB are fully interchangeable. AD8058ARMZ variants are interchangeable with each other. LT1819 variants within the same temperature grade (CMS8 or IMS8) are interchangeable. Cross-substitution between these three groups requires circuit design verification due to differences in slew rate, bandwidth, and input bias current.

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