MAX149ACAP Equivalent & Substitute Parts

Part Overview

The MAX149ACAP is a 10-bit Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc./Maxim Integrated, designed for data acquisition applications requiring SAR (Successive Approximation Register) architecture. The device features 4 or 8 configurable input channels with both differential and single-ended input support, operating across a 2.7V to 5.25V supply range.

The MAX149ACAP is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Key Parameters

Parameter	Specification
Resolution	10 Bit
Sampling Rate	133 kSPS
Number of Input Channels	4, 8
Input Type	Differential, Single Ended
Data Interface	SPI
Architecture	SAR
Reference Type	External, Internal
Analog Supply Voltage	2.7V ~ 5.25V
Digital Supply Voltage	2.7V ~ 5.25V
Operating Temperature Range	0°C ~ 70°C
Package	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the MAX149ACAP are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitutability:

Primary Equivalence Parameters:

Resolution: 10 Bit
Sampling Rate: 133 kSPS
Number of Input Channels: 4, 8
Input Type: Differential, Single Ended
Data Interface: SPI
Architecture: SAR
Reference Type: External, Internal
Supply Voltage Range: 2.7V ~ 5.25V (both analog and digital)
Operating Temperature Range: 0°C ~ 70°C
Package: 20-SSOP
Mounting Type: Surface Mount

All identified substitute parts maintain identical electrical specifications and physical packaging, ensuring direct functional compatibility in existing circuit designs.

Parameter Comparison

Parameter	MAX149ACAP	MAX149ACAP+	MAX149BCAP+
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Resolution	10 Bit	10 Bit	10 Bit
Sampling Rate	133 kSPS	133 kSPS	133 kSPS
Input Channels	4, 8	4, 8	4, 8
Input Type	Differential, Single Ended	Differential, Single Ended	Differential, Single Ended
Data Interface	SPI	SPI	SPI
Architecture	SAR	SAR	SAR
Reference Type	External, Internal	External, Internal	External, Internal
Analog Supply Voltage	2.7V ~ 5.25V	2.7V ~ 5.25V	2.7V ~ 5.25V
Digital Supply Voltage	2.7V ~ 5.25V	2.7V ~ 5.25V	2.7V ~ 5.25V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Not specified	Tube	Tube

Engineering Selection Recommendations

MAX149ACAP+ (Direct Manufacturer Equivalent): The MAX149ACAP+ is the direct successor to the MAX149ACAP, maintaining identical electrical and mechanical specifications. This part is currently in active production status with ROHS3 compliance certification. The primary distinction is packaging format (Tube) and improved RoHS compliance status. This part is the preferred selection for new designs and obsolescence mitigation.

MAX149BCAP+ (Parametric Equivalent): The MAX149BCAP+ provides complete parametric equivalence to the MAX149ACAP across all electrical and mechanical specifications. This part is in active production status with ROHS3 compliance certification and Tube packaging. Selection between MAX149ACAP+ and MAX149BCAP+ depends on specific design requirements and availability considerations, as both parts are functionally interchangeable.

Both substitute parts offer improved compliance status and active production support compared to the obsolete MAX149ACAP.

Frequently Asked Questions (FAQ)

Q: Can MAX149ACAP+ and MAX149BCAP+ be used interchangeably with MAX149ACAP?

A: Yes. Both substitute parts maintain identical electrical specifications (10-bit resolution, 133 kSPS sampling rate, 4/8 input channels, SPI interface, SAR architecture) and physical packaging (20-SSOP surface mount). Direct pin-for-pin and functional compatibility is assured.

Q: What is the difference between MAX149ACAP+ and MAX149BCAP+?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The distinction lies in product designation and internal device characteristics as defined by the manufacturer. Selection should be based on availability and specific application requirements.

Q: Why is the original MAX149ACAP obsolete?

A: The MAX149ACAP has reached end-of-life status. Analog Devices Inc./Maxim Integrated has transitioned production to the active MAX149ACAP+ and MAX149BCAP+ variants, which provide improved compliance certifications and ongoing manufacturing support.

Q: Are there RoHS compliance differences?

A: Yes. The original MAX149ACAP is RoHS non-compliant, while both MAX149ACAP+ and MAX149BCAP+ are ROHS3 compliant. For applications requiring RoHS compliance, either substitute part is required.

Q: What packaging formats are available?

A: The original MAX149ACAP packaging format is not specified. Both substitute parts (MAX149ACAP+ and MAX149BCAP+) are supplied in Tube packaging, which is standard for surface-mount 20-SSOP devices.

Q: Are the supply voltage specifications identical?

A: Yes. All three parts (MAX149ACAP, MAX149ACAP+, MAX149BCAP+) operate with identical analog and digital supply voltage ranges of 2.7V to 5.25V, ensuring compatibility with existing power supply designs.

Q: What is the operating temperature range?

A: All parts operate across 0°C to 70°C, maintaining identical thermal specifications for industrial and commercial applications within this range.

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