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LMC7660IMX Equivalent & Substitute Parts
Part Overview
The LMC7660IMX is a charge pump switching regulator IC manufactured by Texas Instruments, designed to generate a negative fixed output voltage equal to the negative input voltage (-Vin). This device operates across a 1.5V to 10V input range with a 10kHz switching frequency and is packaged in an 8-SOIC surface mount configuration. The LMC7660IMX is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring negative voltage generation from positive input sources.
Substiute Parts
Key Parameters
| Parameter | LMC7660IMX |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Topology | Charge Pump |
| Output Configuration | Negative |
| Output Type | Fixed |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 1.5V |
| Voltage - Input (Max) | 10V |
| Voltage - Output | -Vin |
| Frequency - Switching | 10kHz |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Last Time Buy |
Substitute Part Grouping Explanation
Substitution for the LMC7660IMX is determined by the following critical parameters:
Core Functional Requirements:
- Topology: Charge Pump
- Package: 8-SOIC (0.154", 3.90mm Width)
- Input Voltage Range: 1.5V to 10V minimum
- Switching Frequency: 10kHz or higher
- Output Configuration: Negative or Positive/Negative capable
- Mounting Type: Surface Mount
Compliance & Environmental:
- RoHS3 Compliance
- MSL Rating: 1 (Unlimited) preferred for reliability
Substitute parts must maintain identical or superior electrical characteristics within the specified input voltage range and package footprint. The LMC7660IMX/NOPB (Texas Instruments, Active status) provides direct functional equivalence. Microchip Technology TC7660 series variants (TC7660COA, TC7660COA713, TC7660EOA, TC7660EOA713, TC7660HCOA, TC7660HCOA713, TC7660HEOA, TC7660HEOA713) offer compatible charge pump topology with enhanced output current capability (20mA) and flexible output configuration (Positive or Negative), making them suitable substitutes with extended operating temperature ranges in select variants.
Parameter Comparison
| Parameter | LMC7660IMX | LMC7660IMX/NOPB | TC7660COA | TC7660COA713 | TC7660EOA | TC7660EOA713 | TC7660HCOA | TC7660HCOA713 | TC7660HEOA | TC7660HEOA713 |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Topology | Charge Pump | Charge Pump | Charge Pump | Charge Pump | Charge Pump | Charge Pump | Charge Pump | Charge Pump | Charge Pump | Charge Pump |
| Output Configuration | Negative | Negative | Positive or Negative | Positive or Negative | Positive or Negative | Positive or Negative | Positive or Negative | Positive or Negative | Positive or Negative | Positive or Negative |
| Output Type | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Input (Min) | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V |
| Voltage - Input (Max) | 10V | 10V | 10V | 10V | 10V | 10V | 10V | 10V | 10V | 10V |
| Voltage - Output | -Vin | -Vin | -Vin, 2Vin | -Vin, 2Vin | -Vin, 2Vin | -Vin, 2Vin | -Vin, 2Vin | -Vin, 2Vin | -Vin, 2Vin | -Vin, 2Vin |
| Current - Output | Not specified | Not specified | 20mA | 20mA | 20mA | 20mA | 20mA | 20mA | 20mA | 20mA |
| Frequency - Switching | 10kHz | 10kHz | 10kHz | 10kHz | 10kHz | 10kHz | 120kHz | 120kHz | 120kHz | 120kHz |
| Operating Temperature | Not specified | Not specified | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount | 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 | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Last Time Buy | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitute: LMC7660IMX/NOPB
The LMC7660IMX/NOPB is the direct equivalent manufactured by Texas Instruments with Active product status. This part maintains identical electrical specifications, package configuration, and compliance certifications. Selection of this part eliminates any functional or mechanical redesign requirements and provides the longest supply chain continuity within the Texas Instruments product line.
Secondary Substitutes: TC7660 Series (Microchip Technology)
The Microchip Technology TC7660 series provides functional substitution with enhanced capabilities. All variants maintain the 8-SOIC package footprint, 1.5V to 10V input range, and charge pump topology. Key differentiators include:
- TC7660COA and TC7660COA713: 10kHz switching frequency, 0°C to 70°C operating range, 20mA output current
- TC7660EOA and TC7660EOA713: 10kHz switching frequency, -40°C to 85°C operating range, 20mA output current
- TC7660HCOA and TC7660HCOA713: 120kHz switching frequency, 0°C to 70°C operating range, 20mA output current
- TC7660HEOA and TC7660HEOA713: 120kHz switching frequency, -40°C to 85°C operating range, 20mA output current
All TC7660 variants support both positive and negative output configurations, providing design flexibility beyond the LMC7660IMX negative-only output. All parts are ROHS3 compliant. Selection among TC7660 variants depends on operating temperature requirements and switching frequency tolerance. The 120kHz variants (HCOA, HCOA713, HEOA, HEOA713) reduce external component size through higher switching frequency. Extended temperature range variants (EOA, EOA713, HEOA, HEOA713) support -40°C to 85°C operation.
Frequently Asked Questions (FAQ)
Q: Can TC7660 series parts directly replace the LMC7660IMX without PCB modifications?
A: Yes. All TC7660 variants share the identical 8-SOIC (0.154", 3.90mm Width) package footprint and pinout compatibility with the LMC7660IMX. No PCB layout changes are required. However, the higher switching frequency variants (120kHz) may allow optimization of external filter component values.
Q: What is the functional difference between LMC7660IMX and TC7660 series?
A: The LMC7660IMX generates only negative output voltage (-Vin). TC7660 series parts support both positive and negative output configurations through pin strapping, providing additional design flexibility. Both maintain identical input voltage range (1.5V to 10V) and charge pump topology.
Q: Which substitute should I select for extended temperature operation?
A: For applications requiring -40°C to 85°C operation, select TC7660EOA, TC7660EOA713, TC7660HEOA, or TC7660HEOA713. These variants extend the operating temperature range beyond the standard 0°C to 70°C specification of TC7660COA and TC7660HCOA variants.
Q: Does switching frequency affect circuit performance?
A: Switching frequency affects external component sizing. The 10kHz variants (LMC7660IMX, TC7660COA, TC7660EOA) require larger filter capacitors compared to 120kHz variants (TC7660HCOA, TC7660HEOA). Both frequencies are suitable for the same applications; frequency selection depends on component size and cost constraints.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. The LMC7660IMX and all TC7660 series variants are ROHS3 compliant. All parts meet environmental and hazardous substance restrictions.
Q: What is the significance of MSL rating differences?
A: Moisture Sensitivity Level (MSL) 1 (Unlimited) indicates no moisture sensitivity restrictions during storage and handling. TC7660HCOA has MSL 3 (168 Hours), requiring controlled humidity storage and bake-out procedures before reflow soldering. For standard manufacturing environments, MSL 1 parts (LMC7660IMX/NOPB, TC7660COA713, TC7660EOA713, TC7660HCOA713, TC7660HEOA, TC7660HEOA713) are preferred.
Q: Is the LMC7225IM5/NOPB listed as a substitute?
A: No. The LMC7225IM5/NOPB is a general-purpose comparator in SOT-23-5 package, functionally distinct from the LMC7660IMX charge pump regulator. This part is not a suitable substitute and serves a different circuit function.
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