ADC0804LCWM Equivalent & Substitute Parts

Part Overview

The ADC0804LCWM is an 8-bit Analog to Digital Converter manufactured by Texas Instruments, designed for data acquisition applications requiring single-channel differential input conversion. The device features a Successive Approximation Register (SAR) architecture with a 10 kHz sampling rate and operates from 4.5V to 6.3V supply voltage. The main part is classified as Obsolete, which necessitates identification of equivalent and substitute components for ongoing system support and new designs.

Substiute Parts

ADC0804LCWM

Texas InstrumentsIn Stock: 1758ADC0804LCWM Datasheet

Current PartRFQ

ADC0804LCWM/NOPB

Texas InstrumentsIn Stock: 1326ADC0804LCWM/NOPB Datasheet

DirectRFQ

ADC0831CCWM/NOPB

Texas InstrumentsIn Stock: 1016ADC0831CCWM/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ADC0804LCWM is determined by the following critical parameters:

Direct Functional Equivalence (Same Package, Interface, and Core Specifications):

• Number of Bits: 8
• Architecture: SAR
• Data Interface: Parallel
• Package / Case: 20-SOIC
• Voltage Supply Range: 4.5V ~ 6.3V
• Number of Inputs: 1

Acceptable Variations for Substitution:

• Sampling Rate: May increase (backward compatible)
• Product Status: Active or Last Time Buy preferred over Obsolete
• RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment
• Operating Temperature: May be narrower if application requirements permit
• Input Type: May expand (Differential, Pseudo-Differential, Single Ended acceptable)
• Data Interface: May change if system redesign is acceptable

The ADC0804LCWM/NOPB qualifies as a direct substitute due to identical electrical specifications and package format, with the primary difference being improved RoHS compliance and Active product status. The ADC0831CCWM/NOPB represents a functional alternative requiring circuit redesign due to package change (14-SOIC), interface change (SPI), and expanded input type capability, but maintains 8-bit resolution and SAR architecture.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Redesign Required): The ADC0804LCWM/NOPB is the preferred substitute. It maintains identical electrical specifications, package format, and pinout compatibility with the original ADC0804LCWM. The primary advantages are Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. This part is suitable for immediate substitution in existing designs.

For System Redesign (Enhanced Performance): The ADC0831CCWM/NOPB offers increased sampling rate (31.25 kHz versus 10 kHz) and expanded input flexibility (Differential, Pseudo-Differential, Single Ended). However, this part requires circuit redesign due to package change (14-SOIC versus 20-SOIC), interface change (SPI versus Parallel), and narrower operating temperature range (0°C ~ 70°C versus -40°C ~ 85°C). This option is applicable only when system redesign is acceptable and the narrower temperature range meets application requirements.

Compliance Considerations: The original ADC0804LCWM is RoHS non-compliant. Both substitute parts are ROHS3 Compliant, supporting regulatory requirements for new designs and systems subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can ADC0804LCWM/NOPB be used as a direct drop-in replacement for ADC0804LCWM? A: Yes. The ADC0804LCWM/NOPB is electrically and mechanically identical to the ADC0804LCWM, with identical pinout, package format (20-SOIC), supply voltage range (4.5V ~ 6.3V), sampling rate (10 kHz), and operating temperature range (-40°C ~ 85°C). No circuit modifications are required.

Q: What are the key differences between ADC0804LCWM/NOPB and ADC0831CCWM/NOPB? A: The primary differences are: (1) Package format: ADC0804LCWM/NOPB uses 20-SOIC; ADC0831CCWM/NOPB uses 14-SOIC; (2) Data Interface: ADC0804LCWM/NOPB uses Parallel; ADC0831CCWM/NOPB uses SPI; (3) Sampling Rate: ADC0804LCWM/NOPB operates at 10 kHz; ADC0831CCWM/NOPB operates at 31.25 kHz; (4) Input Type: ADC0804LCWM/NOPB supports Differential only; ADC0831CCWM/NOPB supports Differential, Pseudo-Differential, and Single Ended; (5) Operating Temperature: ADC0804LCWM/NOPB operates -40°C ~ 85°C; ADC0831CCWM/NOPB operates 0°C ~ 70°C.

Q: Is ADC0831CCWM/NOPB suitable for applications requiring -40°C operation? A: No. The ADC0831CCWM/NOPB has a minimum operating temperature of 0°C, making it unsuitable for applications requiring -40°C operation. The ADC0804LCWM/NOPB maintains the original -40°C ~ 85°C operating range.

Q: Why is the original ADC0804LCWM classified as Obsolete? A: The Obsolete status indicates that Texas Instruments has discontinued active production and support for this part number. The ADC0804LCWM/NOPB (Active status) and ADC0831CCWM/NOPB (Last Time Buy status) represent the current and transitional alternatives from the manufacturer.

Q: What is the significance of RoHS compliance for these parts? A: The original ADC0804LCWM is RoHS non-compliant, while both substitute parts (ADC0804LCWM/NOPB and ADC0831CCWM/NOPB) are ROHS3 Compliant. RoHS compliance is required for products sold in the European Union and many other markets. For new designs or systems subject to RoHS directives, the compliant substitutes are mandatory.

Q: Can the parallel interface of ADC0804LCWM/NOPB be converted to SPI for compatibility with ADC0831CCWM/NOPB? A: No. The data interface difference (Parallel versus SPI) requires circuit redesign at the microcontroller or processor interface level. This is not a simple conversion and involves significant firmware and hardware modifications.

Q: What packaging options are available for ADC0804LCWM/NOPB? A: The ADC0804LCWM/NOPB is supplied in Tube packaging, maintaining the 20-SOIC (0.295", 7.50mm Width) surface mount package format.