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LMH6658MMX Equivalent & Substitute Parts
Part Overview
The LMH6658MMX 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 is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement.
The LMH6658MMX operates across a 3V to 12V supply range with a slew rate of 700V/µs and gain bandwidth product of 140 MHz, making it suitable for general-purpose amplification applications requiring moderate to high-speed performance. Due to its obsolete status and non-RoHS compliance, direct replacements and parametric equivalents are required for new designs and ongoing production.
Substiute Parts
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 |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | — |
| Mounting Type | Surface Mount | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LMH6658MMX is determined by the following critical parameters:
Primary Substitution Criteria:
- Dual-channel (2 circuit) configuration
- 8-pin surface mount package (8-VSSOP, 8-TSSOP, or 8-MSOP)
- Supply voltage range: 3V to 12V minimum
- Operating temperature range: -40°C to 85°C (or compatible subset)
- Voltage feedback amplifier topology
Secondary Compatibility Factors:
- Slew rate ≥ 700V/µs (LMH6658MMX baseline)
- Gain bandwidth product ≥ 140 MHz (LMH6658MMX baseline)
- Input bias current ≤ 5 µA (LMH6658MMX baseline)
- Output current capability ≥ 110 mA per channel
Substitutes are grouped into three categories:
-
Direct Manufacturer Equivalent (LMH6658MMX/NOPB): Identical electrical specifications and package, manufactured by National Semiconductor with active product status.
-
Parametric Equivalent (LMH6658MM/NOPB): Texas Instruments part with identical electrical specifications, tape & reel packaging, and RoHS3 compliance.
-
Functional Alternatives (AD8058 and LT1819 series): Parts meeting or exceeding core performance parameters with different amplifier classifications (voltage feedback or general purpose) and enhanced specifications.
Parameter Comparison
| Parameter | LMH6658MMX | LMH6658MMX/NOPB | LMH6658MM/NOPB | AD8058ARMZ | AD8058ARMZ-REEL7 | LT1819CMS8#PBF | LT1819IMS8#PBF |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | National Semiconductor | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Amplifier Type | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | General Purpose | General Purpose |
| 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 | 0 to 70 | -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 |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For Direct Replacement (Identical Specifications):
The LMH6658MM/NOPB is the primary recommended substitute. This part is manufactured by Texas Instruments with identical electrical specifications to the LMH6658MMX, maintains active product status, and carries RoHS3 compliance. The packaging format (Tape & Reel) is suitable for automated assembly processes. This part provides the most direct path for design continuity with improved regulatory compliance.
The LMH6658MMX/NOPB, manufactured by National Semiconductor, offers an alternative direct equivalent with active product status. Both parts are electrically and mechanically interchangeable with the obsolete LMH6658MMX.
For Enhanced Performance Applications:
The AD8058ARMZ and AD8058ARMZ-REEL7 (Analog Devices Inc.) provide superior slew rate performance (1150V/µs versus 700V/µs) and lower input bias current (500 nA versus 5 µA). These parts maintain the same supply voltage range and operating temperature span. The trade-off is a lower gain bandwidth product (100 MHz versus 140 MHz). These substitutes are suitable for applications prioritizing slew rate performance and low input bias current over bandwidth.
The LT1819 series (LT1819CMS8#PBF, LT1819CMS8#TRPBF, LT1819IMS8#PBF, LT1819IMS8#TRPBF) represents a higher-performance alternative with significantly enhanced specifications: 2500V/µs slew rate, 400 MHz gain bandwidth product, and 200 µV input offset voltage. The LT1819IMS8#PBF variant supports the full -40°C to 85°C operating temperature range. These parts are classified as general-purpose amplifiers rather than voltage feedback amplifiers. Output current per channel is reduced to 70 mA. The LT1819CMS8#PBF is limited to 0°C to 70°C operation.
Compliance and Regulatory Considerations:
All recommended substitutes carry RoHS3 compliance and REACH Unaffected status, addressing the non-compliance status of the obsolete LMH6658MMX. All parts maintain MSL Level 1 (Unlimited) moisture sensitivity rating, consistent with the original component.
Frequently Asked Questions (FAQ)
Q: Can the LMH6658MM/NOPB be used as a direct drop-in replacement for the LMH6658MMX?
A: Yes. The LMH6658MM/NOPB is electrically and mechanically identical to the LMH6658MMX. Both parts feature the same dual-channel voltage feedback amplifier configuration, identical electrical specifications (700V/µs slew rate, 140 MHz gain bandwidth product, 110 mA output current per channel), and compatible 8-pin surface mount packaging. The primary difference is product status (active versus obsolete) and RoHS3 compliance.
Q: What is the key difference between the LMH6658 series and the AD8058 series?
A: The LMH6658 series maintains a slew rate of 700V/µs and gain bandwidth product of 140 MHz. The AD8058 series provides enhanced slew rate performance (1150V/µs) and significantly lower input bias current (500 nA versus 5 µA), but operates at a lower gain bandwidth product (100 MHz). Both are voltage feedback amplifiers with dual-channel configuration and compatible supply voltage ranges (3V to 12V). Selection depends on whether the application prioritizes slew rate and input bias current performance or bandwidth performance.
Q: Are the LT1819 parts suitable replacements for the LMH6658MMX?
A: The LT1819 series can function as substitutes in applications where enhanced performance is acceptable. These parts are classified as general-purpose amplifiers rather than voltage feedback amplifiers, and provide superior slew rate (2500V/µs) and gain bandwidth product (400 MHz). However, output current per channel is reduced to 70 mA compared to 110 mA for the LMH6658MMX. The LT1819CMS8#PBF is limited to 0°C to 70°C operation, while LT1819IMS8#PBF and LT1819IMS8#TRPBF support -40°C to 85°C. Verify output current requirements before substitution.
Q: What packaging options are available for these substitutes?
A: All substitute parts are available in 8-pin surface mount packages (8-VSSOP, 8-TSSOP, or 8-MSOP) with 0.118" (3.00mm) width. Packaging format options include Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel®. The LMH6658MM/NOPB is supplied in Tape & Reel format. The AD8058ARMZ-REEL7 is supplied in Cut Tape & Digi-Reel® format with the highest inventory availability (19,100 pcs). Select packaging format based on assembly process requirements.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All recommended substitute parts carry RoHS3 compliance certification. The original LMH6658MMX is RoHS non-compliant. Substitution with any of the recommended parts addresses regulatory compliance requirements for new designs and production.
Q: What is the inventory status of these substitute parts?
A: The LMH6658MM/NOPB has 15,300 pcs in stock. The AD8058ARMZ-REEL7 has the highest availability at 19,100 pcs. The LT1819 series variants range from 2,240 to 3,054 pcs in stock. The original LMH6658MMX has 20,200 pcs available but is obsolete. Verify current inventory with your supplier before finalizing procurement decisions.
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