LMH6658MM Equivalent & Substitute Parts

Part Overview

The LMH6658MM 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 9,467 units remain in stock as new original inventory. The LMH6658MM delivers rail-to-rail output capability with a slew rate of 700V/µs and gain bandwidth product of 140 MHz, suitable for applications requiring moderate-speed signal conditioning and amplification across supply voltages from 3V to 12V.

Due to its obsolete product status, identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new product development. Active alternatives with comparable or enhanced electrical characteristics are available from Texas Instruments and Analog Devices Inc.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	700	V/µs
Gain Bandwidth Product	140	MHz
-3dB Bandwidth	270	MHz
Current - Input Bias	5	µA
Voltage - Input Offset	1	mV
Current - Supply (per channel)	6.5	mA
Current - Output / Channel	110	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
Supplier Device Package	8-VSSOP	—

Substitute Part Grouping Explanation

Substitute parts for the LMH6658MM are grouped into two categories based on electrical and mechanical compatibility:

Category 1: Parametric Equivalents (Direct Replacements)

LMH6658MM/NOPB and LMH6658MMX/NOPB maintain identical electrical specifications to the main part: 700V/µs slew rate, 140 MHz gain bandwidth product, 270 MHz -3dB bandwidth, 5 µA input bias current, 1 mV input offset voltage, 6.5 mA supply current per channel, and 110 mA output current per channel. Both operate across 3V to 12V supply range and -40°C to 85°C temperature range. The primary distinction is product status: LMH6658MM/NOPB is active with RoHS3 compliance and tape & reel packaging, while LMH6658MMX/NOPB is active from National Semiconductor. These parts are pin-compatible and functionally interchangeable.

Category 2: Manufacturer Recommended Substitutes (Performance Enhancements)

AD8058ARMZ, AD8058ARMZ-REEL, and AD8058ARMZ-REEL7 from Analog Devices Inc. offer enhanced electrical performance: 1150V/µs slew rate (64% higher), 100 MHz gain bandwidth product, 325 MHz -3dB bandwidth, 500 nA input bias current (100× lower), and 14 mA supply current. These parts maintain 1 mV input offset voltage, 3V to 12V supply range, -40°C to 85°C operating temperature, and identical package footprint (8-MSOP). Higher slew rate and lower input bias current provide superior performance in precision and high-speed applications.

LT1819CMS8#PBF, LT1819CMS8#TRPBF, LT1819IMS8#PBF, and LT1819IMS8#TRPBF from Analog Devices Inc. are general-purpose amplifiers with significantly enhanced specifications: 2500V/µs slew rate (3.6× higher), 400 MHz gain bandwidth product (2.9× higher), 325 MHz -3dB bandwidth, 2 µA input bias current, 200 µV input offset voltage (5× lower), and 9 mA supply current per channel. Operating temperature for LT1819CMS8 variants is 0°C to 70°C; LT1819IMS8 variants extend to -40°C to 85°C. These parts are suitable for applications requiring higher bandwidth and faster transient response.

Substitution is determined by matching: dual-circuit configuration, voltage feedback topology, rail-to-rail output, surface mount 8-MSOP/8-VSSOP package, 3V to 12V supply compatibility, and -40°C to 85°C operating range (or subset thereof).

Parameter Comparison

Parameter	LMH6658MM	LMH6658MM/NOPB	LMH6658MMX/NOPB	AD8058ARMZ	AD8058ARMZ-REEL7	LT1819IMS8#PBF	LT1819IMS8#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	General Purpose	General Purpose
Number of Circuits	2	2	2	2	2	2	2
Slew Rate (V/µs)	700	700	700	1150	1150	2500	2500
Gain Bandwidth Product (MHz)	140	140	140	100	100	400	400
-3dB Bandwidth (MHz)	270	270	270	325	325	—	—
Current - Input Bias (µA)	5	5	5	0.5	0.5	2	2
Voltage - Input Offset (mV)	1	1	1	1	1	0.2	0.2
Current - Supply (mA)	6.5 (x2)	6.5 (x2)	6.5 (x2)	14	14	9 (x2)	9 (x2)
Current - Output / Channel (mA)	110	110	110	—	—	70	70
Voltage - Supply Span (V)	3 to 12	3 to 12	3 to 12	3 to 12	3 to 12	2.5 to 12.6	2.5 to 12.6
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Package / Case	8-VSSOP	8-VSSOP	8-VSSOP	8-MSOP	8-MSOP	8-MSOP	8-MSOP
RoHS Status	Non-compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	9467	15300	16772	2204	19100	2380	2240

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select LMH6658MM/NOPB when active product status and RoHS3 compliance are required. This part maintains 100% electrical equivalence to the obsolete LMH6658MM while offering superior supply chain availability (15,300 units in stock) and regulatory compliance. Tape & reel packaging supports automated assembly processes. LMH6658MMX/NOPB from National Semiconductor provides an alternative active source with equivalent specifications and higher inventory (16,772 units).

For Performance Enhancement with Voltage Feedback Topology:

Select AD8058ARMZ, AD8058ARMZ-REEL, or AD8058ARMZ-REEL7 when higher slew rate (1150V/µs) and lower input bias current (500 nA) are beneficial. These parts maintain voltage feedback architecture and dual-circuit configuration while offering 64% faster slew rate and 100× lower input bias current. Supply current increases to 14 mA. AD8058ARMZ-REEL7 provides the highest inventory (19,100 units) with cut tape and Digi-Reel packaging options.

For Maximum Performance (General Purpose Topology):

Select LT1819IMS8#PBF or LT1819IMS8#TRPBF when applications require 2500V/µs slew rate, 400 MHz gain bandwidth product, and 200 µV input offset voltage. These general-purpose amplifiers deliver 3.6× higher slew rate and 2.9× higher bandwidth than the LMH6658MM. Operating temperature range extends to -40°C to 85°C. Supply current per channel is 9 mA with 70 mA output current per channel. Tape & reel variant (LT1819IMS8#TRPBF) supports high-volume manufacturing.

All recommended substitutes are RoHS3 compliant, MSL Level 1, and available in active product status. Package footprint compatibility (8-MSOP/8-VSSOP) ensures PCB layout reuse.

Frequently Asked Questions (FAQ)

Q1: Can LMH6658MM/NOPB directly replace the obsolete LMH6658MM without circuit modification?

Yes. LMH6658MM/NOPB is a parametric equivalent with identical electrical specifications: 700V/µs slew rate, 140 MHz gain bandwidth product, 270 MHz -3dB bandwidth, 5 µA input bias current, 1 mV input offset voltage, 6.5 mA supply current per channel, and 110 mA output current per channel. Pin configuration and package footprint (8-VSSOP) are identical. No circuit redesign is required.

Q2: What is the primary difference between LMH6658MM/NOPB and LMH6658MMX/NOPB?

Both parts are parametric equivalents with identical electrical performance. The distinction is manufacturer: LMH6658MM/NOPB is from Texas Instruments with tape & reel packaging; LMH6658MMX/NOPB is from National Semiconductor. Both are active products with RoHS3 compliance. Selection depends on supply chain preference and packaging requirements.

Q3: Why do AD8058ARMZ variants have higher slew rate but lower gain bandwidth product than the LMH6658MM?

AD8058ARMZ parts are optimized for different performance characteristics. The 1150V/µs slew rate (64% higher) supports faster transient response, while the 100 MHz gain bandwidth product reflects a different frequency response profile. The 325 MHz -3dB bandwidth remains comparable to the LMH6658MM (270 MHz). Selection depends on whether slew rate or gain bandwidth product is the limiting factor in the application.

Q4: Are LT1819 variants suitable as direct replacements for LMH6658MM?

LT1819 variants are functional substitutes but not direct replacements. They are general-purpose amplifiers rather than voltage feedback amplifiers, with significantly enhanced performance: 2500V/µs slew rate, 400 MHz gain bandwidth product, 2 µA input bias current, and 200 µV input offset voltage. These improvements may require circuit optimization (compensation, feedback network adjustment) to avoid instability or oscillation. LT1819IMS8 variants support the full -40°C to 85°C operating range.

Q5: What packaging options are available for substitute parts?

LMH6658MM/NOPB: Tape & Reel (TR). LMH6658MMX/NOPB: Bulk. AD8058ARMZ: Tube. AD8058ARMZ-REEL: Standard reel. AD8058ARMZ-REEL7: Cut Tape (CT) & Digi-Reel. LT1819CMS8#PBF: Tube. LT1819CMS8#TRPBF: Tape & Reel (TR). LT1819IMS8#PBF: Tube. LT1819IMS8#TRPBF: Tape & Reel (TR). Select packaging based on assembly process requirements and volume.

Q6: Are all substitute parts RoHS3 compliant?

Yes. LMH6658MM/NOPB, LMH6658MMX/NOPB, AD8058ARMZ, AD8058ARMZ-REEL, AD8058ARMZ-REEL7, LT1819CMS8#PBF, LT1819CMS8#TRPBF, LT1819IMS8#PBF, and LT1819IMS8#TRPBF are all RoHS3 compliant. The original LMH6658MM is RoHS non-compliant. Compliance status is critical for applications subject to environmental regulations.

Q7: What is the moisture sensitivity level (MSL) for all parts?

All parts listed—LMH6658MM, LMH6658MM/NOPB, LMH6658MMX/NOPB, AD8058ARMZ variants, and LT1819 variants—are MSL Level 1 (Unlimited). No special moisture control or baking procedures are required during storage or handling.

Q8: Can the 8-VSSOP package (LMH6658MM) be directly soldered using the same footprint as 8-MSOP (AD8058, LT1819)?

8-VSSOP and 8-MSOP are both 8-pin surface mount packages with 0.118" (3.00mm) width and similar pitch. Footprints are mechanically compatible for PCB layout purposes. However, verify exact pin spacing and solder pad dimensions with the respective datasheets before finalizing PCB design. Minor layout adjustments may be necessary.

Q9: Which substitute part offers the best supply chain availability?

AD8058ARMZ-REEL7 has the highest inventory at 19,100 units in stock. LMH6658MMX/NOPB follows with 16,772 units, and LMH6658MM/NOPB with 15,300 units. For long-term supply security, AD8058ARMZ-REEL7 is the preferred choice.

Q10: What is the ECCN classification for all parts?

All parts—LMH6658MM, LMH6658MM/NOPB, LMH6658MMX/NOPB, AD8058ARMZ variants, and LT1819 variants—are classified as EAR99. This classification indicates no specific export control restrictions under the Export Administration Regulations (EAR).

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