ADS7841P Equivalent & Substitute Parts

Part Overview

The ADS7841P is a 12-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring 4 single-ended inputs with a 200 kSPS sampling rate. The device features a SAR (Successive Approximation Register) architecture with external reference capability and SPI digital interface, housed in a 16-pin DIP package for through-hole mounting.

The ADS7841P is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support legacy system maintenance or redesigns requiring active component alternatives.

Substiute Parts

ADS7841P

Texas InstrumentsIn Stock: 3710ADS7841P Datasheet

Current PartRFQ

ADS7841E

Texas InstrumentsIn Stock: 20797ADS7841E Datasheet

MFR RecommendedRFQ

MAX1247ACPE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1064MAX1247ACPE+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7841P are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Resolution: 12 bits
• Architecture: SAR
• Data Interface: SPI
• Reference Type: External
• Configuration: MUX-S/H-ADC with 1:1 S/H:ADC ratio
• Number of A/D Converters: 1

Secondary Compatibility Criteria:

• Sampling Rate: 200 kSPS or higher
• Number of Inputs: 4 or greater
• Input Type: Single Ended capability
• Supply Voltage Compatibility: Overlap with 2.7V ~ 5V range
• Operating Temperature: Coverage of -40°C ~ 125°C range or subset thereof

The ADS7841E (Texas Instruments) is a direct functional equivalent with identical electrical specifications, differing only in package format (16-SSOP surface mount versus 16-DIP through hole). The MAX1247ACPE+ (Analog Devices Inc./Maxim Integrated) provides functional substitution with compatible core parameters, though with variations in sampling rate (133 kSPS), input configuration flexibility (2 or 4 inputs), and operating temperature range (0°C ~ 70°C).

Parameter Comparison

Engineering Selection Recommendations

ADS7841E (Texas Instruments): This part is the manufacturer-recommended substitute for the ADS7841P. It maintains identical electrical specifications and operating characteristics, with active product status ensuring long-term availability and supply chain support. The primary design consideration is the package transition from 16-DIP through-hole to 16-SSOP surface mount, which requires PCB layout modification. This substitute is appropriate for new designs or redesigns where surface-mount assembly is feasible. RoHS3 compliance and MSL rating of 2 (1 Year) match the original part.

MAX1247ACPE+ (Analog Devices Inc./Maxim Integrated): This part provides functional substitution while maintaining the 16-DIP through-hole package format, eliminating PCB redesign requirements. The device is active and widely available. Key differences include reduced sampling rate (133 kSPS versus 200 kSPS), flexible input configuration (2 or 4 inputs selectable), and extended supply voltage range (2.7V ~ 5.25V). The operating temperature range is limited to 0°C ~ 70°C, which excludes the lower temperature extreme (-40°C) of the original specification. This substitute is suitable for applications where the reduced sampling rate is acceptable and operating temperature remains within 0°C ~ 70°C. MSL rating of 1 (Unlimited) provides superior moisture handling characteristics.

Selection between these substitutes depends on application requirements: prioritize ADS7841E for sampling rate-critical applications with surface-mount capability; prioritize MAX1247ACPE+ for through-hole assembly requirements with temperature ranges above 0°C.

Frequently Asked Questions (FAQ)

Q: Can the ADS7841E directly replace the ADS7841P without firmware changes?

A: The ADS7841E is electrically and functionally identical to the ADS7841P. No firmware or software modifications are required. The primary change is physical package format (16-SSOP surface mount versus 16-DIP through hole), which requires PCB layout modification but does not affect electrical interface or protocol implementation.

Q: What is the key limitation of the MAX1247ACPE+ as a substitute?

A: The MAX1247ACPE+ operates within a reduced temperature range of 0°C ~ 70°C, compared to the ADS7841P specification of -40°C ~ 125°C. Applications requiring operation below 0°C or above 70°C cannot use this substitute. Additionally, the sampling rate is 133 kSPS versus 200 kSPS, which may impact applications with high-speed conversion requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the ADS7841E and MAX1247ACPE+ are ROHS3 compliant, matching the compliance status of the ADS7841P. Both parts are also REACH unaffected and carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: Which substitute is recommended for new designs?

A: For new designs, the ADS7841E is the manufacturer-recommended substitute, offering identical specifications and active product status. If through-hole mounting is a design requirement, the MAX1247ACPE+ is suitable provided the operating temperature range (0°C ~ 70°C) and sampling rate (133 kSPS) meet application requirements.

Q: What is the difference in moisture sensitivity between the substitutes?

A: The ADS7841P and ADS7841E both carry MSL rating 2 (1 Year), indicating moderate moisture sensitivity with a one-year floor life. The MAX1247ACPE+ carries MSL rating 1 (Unlimited), indicating superior moisture resistance with unlimited floor life. This difference may be relevant for long-term storage or high-humidity environments.

Q: Can the MAX1247ACPE+ be used in applications requiring 4 single-ended inputs?

A: Yes. The MAX1247ACPE+ supports configurable input modes of 2 or 4 inputs with single-ended or differential input types. For 4 single-ended input operation, the device is compatible with the ADS7841P functional requirements.