MAX660CSA Equivalent & Substitute Parts

Part Overview

The MAX660CSA is a charge pump switching regulator IC manufactured by Analog Devices Inc./Maxim Integrated, designed for positive or negative fixed output voltage generation with 100mA output current capability in an 8-SOIC surface mount package. This device operates across a 1.5V to 5.5V input range and supports multiple output configurations (-Vin, 2Vin) at switching frequencies of 10kHz or 80kHz.

The MAX660CSA is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and access active product support with enhanced compliance certifications such as RoHS3 compliance and extended operating temperature ranges.

Key Parameters

Parameter	MAX660CSA
Topology	Charge Pump
Output Configuration	Positive or Negative
Output Type	Fixed
Number of Outputs	1
Voltage - Input (Min)	1.5V
Voltage - Input (Max)	5.5V
Voltage - Output (Min/Fixed)	-Vin, 2Vin
Current - Output	100mA
Frequency - Switching	10kHz, 80kHz
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	0°C ~ 70°C (TA)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX660CSA is determined by the following critical parameters:

Primary Substitution Criteria:

Charge pump topology with fixed output configuration
Output current capability of 100mA minimum
Input voltage range compatibility (1.5V to 5.5V)
Output voltage options including -Vin and 2Vin
8-SOIC surface mount package
Switching frequency operation at 10kHz or 80kHz

Grouping Logic:

Group 1 - Direct Maxim/Analog Devices Equivalents: Parts maintaining identical electrical specifications and package format with improved product status and compliance certifications.

Group 2 - Texas Instruments LM2660 Series: Functionally equivalent charge pump regulators with identical output current (100mA), input voltage range, and package, with extended operating temperature range and additional output voltage option (Vin/2).

Group 3 - Analog Devices LTC660 Series: Enhanced charge pump regulators with identical output current, expanded input voltage range options, and additional output voltage capability (Vin/2), maintaining 8-SOIC package compatibility.

Group 4 - Reduced Current Alternatives: Parts with lower output current (40mA) or limited output configuration (positive only), suitable only for applications with reduced current requirements.

Group 5 - Negative Output Specialized: Parts optimized for negative output generation with extended input voltage range, applicable only to negative output applications.

Parameter Comparison

Part Number	Manufacturer	Output Config	Output Current	Input Range (Min-Max)	Output Voltage Options	Switching Freq	Package	Temp Range	Product Status	RoHS Status
MAX660CSA	Analog Devices/Maxim	Pos/Neg	100mA	1.5V-5.5V	-Vin, 2Vin	10kHz, 80kHz	8-SOIC	0°C~70°C	Obsolete	Non-compliant
MAX660CSA+	Analog Devices/Maxim	Pos/Neg	100mA	1.5V-5.5V	-Vin, 2Vin	10kHz, 80kHz	8-SOIC	0°C~70°C	Active	RoHS3 Compliant
LM2660M/NOPB	Texas Instruments	Pos/Neg	100mA	1.5V-5.5V	-Vin, 2Vin, Vin/2	5kHz, 40kHz	8-SOIC	-40°C~85°C	Active	RoHS3 Compliant
LM2660MX/NOPB	Texas Instruments	Pos/Neg	100mA	1.5V-5.5V	-Vin, 2Vin, Vin/2	5kHz, 40kHz	8-SOIC	-40°C~85°C	Active	RoHS3 Compliant
LM2665M6X/NOPB	Texas Instruments	Positive	40mA	2.5V-5.5V	2Vin, Vin/2	80kHz	SOT-23-6	-40°C~85°C	Active	RoHS3 Compliant
LMC7660IM/NOPB	Texas Instruments	Negative	Not specified	1.5V-10V	-Vin	10kHz	8-SOIC	Not specified	Active	RoHS3 Compliant
LTC660CS8#PBF	Analog Devices	Pos/Neg	100mA	1.5V-5.5V, 2.5V-5.5V	-Vin, 2Vin, Vin/2	10kHz, 80kHz	8-SOIC	0°C~70°C	Active	RoHS3 Compliant
LTC660CS8#TRPBF	Analog Devices	Pos/Neg	100mA	1.5V-5.5V, 2.5V-5.5V	-Vin, 2Vin, Vin/2	10kHz, 80kHz	8-SOIC	0°C~70°C	Active	RoHS3 Compliant
MAX660M/NOPB	Texas Instruments	Pos/Neg	100mA	1.5V-5.5V	-Vin, 2Vin	10kHz, 80kHz	8-SOIC	-40°C~85°C	Active	RoHS3 Compliant
MAX660MX/NOPB	Texas Instruments	Pos/Neg	100mA	1.5V-5.5V	-Vin, 2Vin	10kHz, 80kHz	8-SOIC	-40°C~85°C	Active	RoHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - MAX660CSA+

The MAX660CSA+ is the direct successor to the MAX660CSA, manufactured by Analog Devices/Maxim Integrated. It maintains identical electrical specifications and 8-SOIC package format while transitioning from obsolete to active product status. RoHS3 compliance certification is achieved. This part is the preferred choice for direct replacement in existing designs without modification.

Secondary Recommendation - LTC660CS8#TRPBF or LTC660CS8#PBF

The LTC660 series from Analog Devices provides enhanced functionality with identical 100mA output current and 8-SOIC package compatibility. These parts add Vin/2 output voltage capability and maintain the 10kHz/80kHz switching frequency options. Both parts are active with RoHS3 compliance. The #TRPBF variant is supplied in Tape & Reel packaging; the #PBF variant is supplied in Tube packaging. Operating temperature range remains 0°C to 70°C, matching the original specification.

Alternative Recommendation - LM2660MX/NOPB or LM2660M/NOPB

The LM2660 series from Texas Instruments offers full electrical equivalence with identical 100mA output current, positive/negative output configuration, and 8-SOIC package. These parts provide extended operating temperature range (-40°C to 85°C) and RoHS3 compliance. The switching frequency operates at 5kHz or 40kHz rather than 10kHz or 80kHz. The LM2660MX/NOPB variant is supplied in Cut Tape & Digi-Reel packaging with higher inventory availability (27,669 units); the LM2660M/NOPB variant is supplied in Tube packaging.

Specialized Application - LMC7660IM/NOPB

The LMC7660IM/NOPB is applicable only for applications requiring negative output voltage generation. This part supports extended input voltage range (1.5V to 10V) and operates at 10kHz switching frequency. It is not suitable for applications requiring positive output or dual output capability.

Not Recommended - LM2665M6X/NOPB

The LM2665M6X/NOPB has reduced output current (40mA versus 100mA), positive output configuration only, and SOT-23-6 package format. This part is suitable only for applications with significantly reduced current requirements and is not a general-purpose substitute for the MAX660CSA.

Frequently Asked Questions (FAQ)

Q: Can MAX660CSA+ be used as a direct replacement for MAX660CSA?

A: Yes. The MAX660CSA+ maintains identical electrical specifications, output current (100mA), input voltage range (1.5V to 5.5V), output voltage options (-Vin, 2Vin), switching frequencies (10kHz, 80kHz), and 8-SOIC package format. The primary differences are active product status and RoHS3 compliance certification. No design modifications are required.

Q: What is the difference between LM2660M/NOPB and LM2660MX/NOPB?

A: Both parts are electrically identical with 100mA output current, positive/negative output configuration, and 8-SOIC package. The primary difference is packaging format: LM2660M/NOPB is supplied in Tube packaging, while LM2660MX/NOPB is supplied in Cut Tape & Digi-Reel format. The LM2660MX/NOPB has significantly higher inventory availability (27,669 units versus 2,356 units).

Q: Are LTC660CS8#PBF and LTC660CS8#TRPBF electrically equivalent?

A: Yes. Both parts are electrically identical with 100mA output current, positive/negative output configuration, 8-SOIC package, and identical electrical specifications. The difference is packaging format: #PBF is supplied in Tube packaging, while #TRPBF is supplied in Tape & Reel packaging. The #TRPBF variant has higher inventory availability (5,350 units versus 2,100 units).

Q: Can LM2665M6X/NOPB replace MAX660CSA in all applications?

A: No. The LM2665M6X/NOPB has reduced output current (40mA versus 100mA), supports positive output configuration only (not negative), and uses SOT-23-6 package instead of 8-SOIC. This part is suitable only for applications with output current requirements of 40mA or less and positive output voltage only.

Q: What is the operating temperature difference between MAX660CSA and its substitutes?

A: The MAX660CSA and its direct Analog Devices equivalents (MAX660CSA+, LTC660 series) operate across 0°C to 70°C. Texas Instruments alternatives (LM2660 series, LMC7660IM/NOPB) provide extended operating temperature range of -40°C to 85°C. Applications requiring operation below 0°C or above 70°C must use Texas Instruments parts.

Q: Does switching frequency difference between MAX660CSA and LM2660 series affect compatibility?

A: The MAX660CSA operates at 10kHz or 80kHz switching frequency, while the LM2660 series operates at 5kHz or 40kHz. Both frequency sets are within the charge pump regulator standard operating range. Frequency differences may affect EMI characteristics and filtering requirements but do not prevent functional substitution. Applications with specific EMI or filtering constraints should evaluate frequency impact.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (MAX660CSA+, LM2660 series, LTC660 series, LMC7660IM/NOPB) are RoHS3 compliant. The original MAX660CSA is RoHS non-compliant. Designs requiring RoHS3 compliance must use active substitute parts.

Q: Can LMC7660IM/NOPB be used for positive output applications?

A: No. The LMC7660IM/NOPB is optimized for negative output generation only, supporting -Vin output configuration. It is not suitable for positive output or dual positive/negative output applications.

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