LMC7660IM Equivalent & Substitute Parts

Part Overview

The LMC7660IM is a Charge Pump Switching Regulator IC manufactured by Texas Instruments, designed to generate a negative fixed output voltage (-Vin) from a positive input supply. This 8-SOIC surface mount device operates across an input voltage range of 1.5V to 10V with a switching frequency of 10kHz. The part is currently in Last Time Buy status, indicating production discontinuation. Equivalent and substitute parts are necessary to ensure design continuity and long-term component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LMC7660IM
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
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
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the LMC7660IM is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — identical pinout and footprint required
Topology: Charge Pump — functional architecture must match
Number of Outputs: 1 — single output configuration
Mounting Type: Surface Mount — same assembly process
Voltage - Input Range: 1.5V to 10V minimum overlap required
Output Configuration: Negative or Negative/Positive capable
Output Type: Fixed — ratiometric output generation

Substitution Groups:

Group 1: Direct Functional Equivalents (Texas Instruments) LMC7660IM/NOPB is the manufacturer-recommended equivalent with identical electrical specifications and Active product status, differing only in packaging format (Tube vs. unspecified original packaging).

Group 2: Microchip TC7660 Series (10kHz Switching) TC7660COA, TC7660COA713, TC7660EOA, and TC7660EOA713 are functionally compatible substitutes. These devices support both positive and negative output configurations, operate at 10kHz switching frequency, and maintain the same input voltage range (1.5V to 10V). Output current capability is specified at 20mA. Temperature range variations exist: TC7660COA/COA713 operate at 0°C to 70°C, while TC7660EOA/EOA713 extend to -40°C to 85°C.

Group 3: Microchip TC7660 Series (120kHz Switching) TC7660HCOA, TC7660HCOA713, TC7660HEOA, and TC7660HEOA713 operate at 120kHz switching frequency, providing higher frequency operation while maintaining electrical compatibility. Temperature ranges: TC7660HCOA/HCOA713 at 0°C to 70°C; TC7660HEOA/HEOA713 at -40°C to 85°C.

Group 4: Microchip TC7662 Series (Extended Input Voltage) TC7662BCOA supports input voltage up to 15V (exceeding the 10V maximum of LMC7660IM) with switching frequency range of 10kHz to 35kHz. This part is suitable for applications requiring higher input voltage tolerance.

Parameter Comparison

Part Number	Manufacturer	Package	Input Voltage (Min-Max)	Output Config	Switching Freq	Output Current	Temp Range	Product Status	Inventory
LMC7660IM	Texas Instruments	8-SOIC	1.5V - 10V	Negative	10kHz	—	—	Last Time Buy	1,000,100 Pcs
LMC7660IM/NOPB	Texas Instruments	8-SOIC	1.5V - 10V	Negative	10kHz	—	—	Active	366,623 Pcs
TC7660COA	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	10kHz	20mA	0°C - 70°C	Active	16,798 Pcs
TC7660COA713	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	10kHz	20mA	0°C - 70°C	Active	15,982 Pcs
TC7660EOA	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	10kHz	20mA	-40°C - 85°C	Active	28,039 Pcs
TC7660EOA713	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	10kHz	20mA	-40°C - 85°C	Active	65,200 Pcs
TC7660HCOA	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	120kHz	20mA	0°C - 70°C	Active	7,164 Pcs
TC7660HCOA713	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	120kHz	20mA	0°C - 70°C	Active	786 Pcs
TC7660HEOA	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	120kHz	20mA	-40°C - 85°C	Active	6,068 Pcs
TC7660HEOA713	Microchip Technology	8-SOIC	1.5V - 10V	Positive or Negative	120kHz	20mA	-40°C - 85°C	Active	18,233 Pcs
TC7662BCOA	Microchip Technology	8-SOIC	1.5V - 15V	Positive or Negative	10kHz - 35kHz	20mA	0°C - 70°C	Active	16,350 Pcs

Engineering Selection Recommendations

Primary Recommendation: LMC7660IM/NOPB This Texas Instruments part is the manufacturer-recommended direct equivalent with identical electrical specifications and Active product status. It provides the most straightforward replacement path with no design modifications required. Inventory availability is substantial at 366,623 units.

Secondary Recommendation: TC7660EOA713 or TC7660EOA For applications requiring extended temperature operation (-40°C to 85°C), the Microchip TC7660EOA series provides full electrical compatibility with the LMC7660IM while maintaining Active status. The TC7660EOA713 variant offers superior inventory availability (65,200 units) in Cut Tape & Digi-Reel packaging. Both variants support negative output configuration and operate at 10kHz switching frequency.

Alternative for Higher Switching Frequency: TC7660HEOA713 or TC7660HEOA Applications benefiting from reduced output ripple and smaller external component sizing may utilize the 120kHz switching frequency variants. TC7660HEOA713 provides extended temperature range (-40°C to 85°C) with 18,233 units in stock. These parts maintain full electrical compatibility with identical input voltage range and output configuration capability.

Extended Input Voltage Applications: TC7662BCOA For designs requiring input voltage tolerance up to 15V, TC7662BCOA is the appropriate selection. This part maintains the 8-SOIC package and negative output capability while extending the maximum input specification. Switching frequency operates within 10kHz to 35kHz range.

Selection Criteria Summary:

All recommended substitutes maintain 8-SOIC package compatibility
All substitutes are ROHS3 compliant and REACH unaffected
All substitutes carry Active product status, ensuring long-term availability
Microchip variants provide specified output current (20mA) and extended temperature options
Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) accommodate different procurement and assembly workflows

Frequently Asked Questions (FAQ)

Q: Can TC7660 series parts directly replace LMC7660IM without PCB modifications? A: Yes. All TC7660 variants maintain identical 8-SOIC pinout and footprint. No PCB layout changes are required. Electrical operation is compatible within the specified input voltage range (1.5V to 10V) and output configuration (negative).

Q: What is the difference between TC7660COA and TC7660EOA? A: The primary difference is operating temperature range. TC7660COA operates at 0°C to 70°C, while TC7660EOA extends to -40°C to 85°C. Both maintain identical switching frequency (10kHz), input voltage range, and output current (20mA). Selection depends on application temperature requirements.

Q: Why do TC7660 parts specify 20mA output current while LMC7660IM does not? A: The LMC7660IM datasheet does not explicitly specify output current. TC7660 series documentation provides this parameter for design reference. Both devices operate on identical charge pump topology and are functionally compatible.

Q: What is the significance of the "713" suffix in part numbers like TC7660COA713? A: The "713" suffix indicates packaging format: Cut Tape & Digi-Reel. Parts without this suffix (e.g., TC7660COA) are supplied in Tube packaging. Electrical specifications are identical; packaging format differs to accommodate different procurement and assembly workflows.

Q: Can I use TC7660HCOA (120kHz) as a drop-in replacement for LMC7660IM (10kHz)? A: Yes, TC7660HCOA is electrically compatible and maintains the same 8-SOIC package. The higher switching frequency (120kHz vs. 10kHz) may reduce output ripple and allow smaller external capacitors. Circuit operation remains compatible; external component values may require optimization for the higher switching frequency.

Q: Is TC7662BCOA suitable for LMC7660IM replacement in 5V input applications? A: Yes. TC7662BCOA supports input voltage from 1.5V to 15V, encompassing the LMC7660IM range (1.5V to 10V). It is compatible for 5V input applications. The extended input voltage rating provides additional design margin for applications with variable supply voltages.

Q: What packaging options are available for Microchip TC7660 substitutes? A: Microchip TC7660 variants are available in three packaging formats: Tube (standard reel), Cut Tape & Digi-Reel (CT), and Tape & Reel (TR). All maintain identical 8-SOIC component specifications. Selection depends on assembly process requirements and procurement preferences.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts (LMC7660IM/NOPB and all TC7660/TC7662 variants) are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements identical to the original LMC7660IM.

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