ADS7818E/2K5G4 Equivalent & Substitute Parts

Part Overview

The ADS7818E/2K5G4 is a 12-bit Analog-to-Digital Converter (ADC) manufactured by Texas Instruments, designed for single-channel differential input data acquisition applications. This device features a Successive Approximation Register (SAR) architecture with an integrated sample-and-hold circuit, SPI digital interface, and internal voltage reference. The part is classified as Obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

ADS7818E/2K5G4

Texas InstrumentsIn Stock: 807ADS7818E/2K5G4 Datasheet

Current PartRFQ

ADS7818E/250

Texas InstrumentsIn Stock: 1278ADS7818E/250 Datasheet

Parametric EquivalentRFQ

ADS7818EB/250

Texas InstrumentsIn Stock: 1703ADS7818EB/250 Datasheet

Parametric EquivalentRFQ

LTC1860CMS8#PBF

Analog Devices Inc.In Stock: 5886LTC1860CMS8#PBF Datasheet

MFR RecommendedRFQ

LTC1860IMS8#PBF

Analog Devices Inc.In Stock: 5713LTC1860IMS8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ADS7818E/2K5G4 is determined by the following critical parameters:

• 12-bit resolution requirement
• 500 kSPS or higher sampling rate capability
• Single differential input channel
• SPI digital interface compatibility
• 5V analog and digital supply voltage operation
• 8-pin surface mount package (8-VSSOP or 8-MSOP)
• Operating temperature range of -40°C to 85°C or wider
• Internal or external voltage reference support

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments ADS7818 Series): Parts ADS7818E/250 and ADS7818EB/250 maintain identical electrical specifications and package footprint compatibility with the main part. These are direct replacements within the same product family.

Manufacturer-Recommended Alternatives (Analog Devices LTC1860 Series): Parts LTC1860CMS8#PBF and LTC1860IMS8#PBF provide functional equivalence with minor parameter variations. These parts support both differential and single-ended input configurations and feature external voltage reference capability, offering design flexibility for new implementations.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Existing Designs):

ADS7818E/250 and ADS7818EB/250 are the preferred choices for direct substitution in existing applications. Both parts maintain identical electrical performance, package compatibility, and pinout with the ADS7818E/2K5G4. These Texas Instruments parts ensure seamless integration without circuit redesign. Both are ROHS3 compliant and support the full -40°C to 85°C operating temperature range. ADS7818EB/250 offers higher inventory availability (1615 pcs) compared to ADS7818E/250 (1180 pcs).

For New Designs and Extended Support:

LTC1860IMS8#PBF is recommended for new implementations requiring long-term component availability. This Analog Devices part maintains active product status, ensuring sustained supply and technical support. It supports the full -40°C to 85°C temperature range and features external voltage reference capability for enhanced design flexibility. The MSL rating of 1 (Unlimited) provides superior moisture handling compared to the main part. LTC1860CMS8#PBF is suitable for applications with relaxed temperature requirements (0°C to 70°C) and offers the highest inventory availability (5800 pcs).

Critical Considerations:

The LTC1860 series operates at 250 kSPS sampling rate, which is half the ADS7818 series rate. Applications requiring 500 kSPS performance must use ADS7818E/250 or ADS7818EB/250. The LTC1860 series supports both differential and single-ended input modes, providing additional flexibility for new circuit designs. Package footprint differences between 8-VSSOP (ADS7818) and 8-MSOP (LTC1860) require PCB layout verification despite identical pin counts.

Frequently Asked Questions (FAQ)

Q: Can LTC1860CMS8#PBF or LTC1860IMS8#PBF be used as direct drop-in replacements for ADS7818E/2K5G4?

A: Functional substitution is possible with design considerations. Both LTC1860 parts support 12-bit resolution, SPI interface, and 5V operation. However, the 250 kSPS sampling rate is half that of the ADS7818 series. If the application requires 500 kSPS performance, LTC1860 parts are not suitable. Additionally, the 8-MSOP package footprint differs from 8-VSSOP, requiring PCB layout verification. The external reference requirement of LTC1860 parts necessitates additional circuit design compared to the internal reference of ADS7818 parts.

Q: What is the difference between ADS7818E/250 and ADS7818EB/250?

A: Both parts are parametric equivalents with identical electrical specifications and package compatibility. The primary difference is packaging format: ADS7818E/250 is supplied in Cut Tape (CT) and Digi-Reel format, while ADS7818EB/250 is supplied in Cut Tape (CT) and Digi-Reel format. Both are classified as Last Time Buy status. Selection between these parts depends on packaging and inventory requirements for your application.

Q: Why do LTC1860 parts have different temperature ranges?

A: LTC1860CMS8#PBF operates over 0°C to 70°C (commercial temperature range), while LTC1860IMS8#PBF operates over -40°C to 85°C (industrial temperature range). The ADS7818E/2K5G4 operates over -40°C to 85°C. For applications requiring the full industrial temperature range, LTC1860IMS8#PBF is the appropriate choice. LTC1860CMS8#PBF is suitable only for applications with relaxed temperature requirements.

Q: What is the impact of external versus internal voltage reference?

A: The ADS7818E/2K5G4 features an internal voltage reference, simplifying circuit design by eliminating the need for external reference components. LTC1860 parts require an external voltage reference, necessitating additional circuit design and component selection. For new designs, external reference capability provides flexibility in reference voltage selection and potential performance optimization. For existing designs using internal reference, ADS7818E/250 or ADS7818EB/250 maintain the same architecture.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts (ADS7818E/250, ADS7818EB/250, LTC1860CMS8#PBF, and LTC1860IMS8#PBF) are ROHS3 compliant, matching the compliance status of the main part ADS7818E/2K5G4.

Q: What is the MSL rating significance for these parts?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. ADS7818 series parts have MSL 2 (1 Year), while LTC1860 series parts have MSL 1 (Unlimited). LTC1860 parts offer superior moisture tolerance, reducing risk of moisture-induced failures during storage and handling. For applications with extended storage periods or challenging environmental conditions, LTC1860 parts provide better reliability margins.