MAX156ACWI Equivalent & Substitute Parts

Part Overview

The MAX156ACWI is an 8-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc./Maxim Integrated, designed for data acquisition applications requiring SAR (Successive Approximation Register) architecture. This component features 2 or 4 selectable input channels with simultaneous sampling capability, supporting both differential and single-ended input configurations. The device operates with ±5V or 5V supply voltages and delivers a 250 kHz sampling rate through a parallel data interface.

The MAX156ACWI is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for legacy systems and new designs requiring this specific functionality.

Key Parameters

Parameter	Specification
Resolution	8 Bit
Sampling Rate	250 kHz
Number of Input Channels	2, 4
Input Type	Differential, Single Ended
Architecture	SAR
Data Interface	Parallel
Configuration	S/H-MUX-ADC
S/H to ADC Ratio	4:1
Number of A/D Converters	1
Reference Type	External, Internal
Analog Supply Voltage	±5V, 5V
Digital Supply Voltage	±5V, 5V
Operating Temperature Range	0°C to 70°C
Package Type	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Features	Selectable Address, Simultaneous Sampling

Substitute Part Grouping Explanation

Substitution eligibility for the MAX156ACWI is determined by strict equivalence across the following critical parameters:

Resolution and Sampling Rate: 8-bit resolution at 250 kHz sampling rate
Input Configuration: Support for 2 or 4 input channels with differential and single-ended input types
Architecture and Interface: SAR architecture with parallel data interface, S/H-MUX-ADC configuration with 4:1 ratio
Supply Voltage Compatibility: ±5V or 5V analog and digital supply voltages
Package and Pinout: 28-SOIC surface mount package with identical mechanical dimensions
Functional Features: Selectable address and simultaneous sampling capability

The MAX156ACWI+ qualifies as a direct substitute based on complete parameter equivalence across all electrical and mechanical specifications. The primary distinction is product status and compliance certification.

Parameter Comparison

Parameter	MAX156ACWI	MAX156ACWI+
Resolution	8 Bit	8 Bit
Sampling Rate (Per Second)	250k	250k
Number of Inputs	2, 4	2, 4
Input Type	Differential, Single Ended	Differential, Single Ended
Data Interface	Parallel	Parallel
Configuration	S/H-MUX-ADC	S/H-MUX-ADC
Ratio - S/H:ADC	4:1	4:1
Number of A/D Converters	1	1
Architecture	SAR	SAR
Reference Type	External, Internal	External, Internal
Voltage - Supply, Analog	±5V, 5V	±5V, 5V
Voltage - Supply, Digital	±5V, 5V	±5V, 5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	28-SOIC (0.295", 7.50mm Width)	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount
Features	Selectable Address, Simultaneous Sampling	Selectable Address, Simultaneous Sampling
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The MAX156ACWI+ is the direct equivalent substitute for the MAX156ACWI. Both components are electrically and mechanically identical across all functional parameters, with identical pinout and package specifications enabling direct board-level replacement without design modification.

The MAX156ACWI+ is classified as an active product with ROHS3 compliance certification, whereas the MAX156ACWI is obsolete and RoHS non-compliant. For new designs and production systems requiring long-term component availability and regulatory compliance, the MAX156ACWI+ is the appropriate selection. Both components maintain identical REACH status and moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can the MAX156ACWI+ be used as a direct replacement for the MAX156ACWI in existing designs?

A: Yes. The MAX156ACWI+ is electrically and mechanically equivalent to the MAX156ACWI. All electrical parameters, pin assignments, package dimensions, and functional features are identical. Direct board-level substitution is possible without circuit modification.

Q: What is the primary difference between these two parts?

A: The MAX156ACWI is classified as obsolete with RoHS non-compliant status. The MAX156ACWI+ is an active product with ROHS3 compliance certification. Both components are functionally identical.

Q: Are there any supply voltage or operating temperature differences?

A: No. Both the MAX156ACWI and MAX156ACWI+ operate with identical ±5V or 5V analog and digital supply voltages and share the same 0°C to 70°C operating temperature range.

Q: Do these parts have the same package and pinout?

A: Yes. Both components use the 28-SOIC surface mount package with identical 0.295" (7.50mm) width and pinout configuration. No PCB layout modifications are required for substitution.

Q: What input configurations are supported?

A: Both parts support 2 or 4 selectable input channels with differential and single-ended input types. The simultaneous sampling feature and selectable address functionality are identical across both components.

Q: Is the sampling rate the same for both parts?

A: Yes. Both the MAX156ACWI and MAX156ACWI+ deliver a 250 kHz sampling rate with 8-bit resolution using SAR architecture and parallel data interface.

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