ADS7818EB/2K5 Equivalent & Substitute Parts

Part Overview

The ADS7818EB/2K5 is a 12-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, configured as a single-input SAR (Successive Approximation Register) architecture device in an 8-VSSOP surface mount package. This data acquisition component operates with a 500 kSPS sampling rate and differential input configuration, supplied in Tape & Reel packaging.

The ADS7818EB/2K5 maintains Active product status with 2188 units currently in stock. Equivalent and substitute parts are identified to address packaging preferences, inventory availability, or extended operating temperature requirements while maintaining core functional compatibility.

Substiute Parts

ADS7818EB/2K5

Texas InstrumentsIn Stock: 2233ADS7818EB/2K5 Datasheet

Current PartRFQ

ADS8665IPWR

Texas InstrumentsIn Stock: 15306ADS8665IPWR Datasheet

MFR RecommendedRFQ

ADS7818E/250

Texas InstrumentsIn Stock: 1278ADS7818E/250 Datasheet

Parametric EquivalentRFQ

ADS7818EB/250

Texas InstrumentsIn Stock: 1703ADS7818EB/250 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7818EB/2K5 are classified based on the following substitution criteria:

Parametric Equivalents maintain identical or functionally equivalent specifications across all critical parameters: 12-bit resolution, 500 kSPS sampling rate, single differential input, SPI interface, SAR architecture, internal reference, 5V analog and digital supply voltages, and -40°C to 85°C operating temperature range. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or product status designation.

Manufacturer Recommended Substitutes provide functional alternatives with enhanced capabilities. The ADS8665IPWR expands input flexibility (differential, pseudo-differential, and single-ended), includes a Programmable Gain Amplifier (PGA), and extends the operating temperature range to 125°C. However, this substitute requires a different package (16-TSSOP vs. 8-VSSOP) and modified supply voltage specifications.

Substitution eligibility is determined by:

• Resolution: 12 bits (required)
• Sampling Rate: 500 kSPS (required)
• Data Interface: SPI (required)
• Architecture: SAR (required)
• Reference Type: Internal (required)
• Number of Inputs: 1 (required)
• Mounting Type: Surface Mount (required)

Parameter Comparison

Engineering Selection Recommendations

ADS7818EB/250 and ADS7818E/250 are parametric equivalents to the ADS7818EB/2K5, maintaining identical electrical specifications and package dimensions. Both parts are designated Last Time Buy status, indicating discontinued or end-of-life product lines. Selection of these equivalents is appropriate only when packaging format (Cut Tape vs. Tape & Reel) is the primary consideration and inventory depletion is acceptable. The ADS7818EB/2K5 in Active status is preferred for new designs requiring long-term supply assurance.

ADS8665IPWR is a manufacturer-recommended substitute offering extended functionality and operating temperature range (-40°C to 125°C). This part introduces a Programmable Gain Amplifier (PGA) and supports multiple input configurations (differential, pseudo-differential, and single-ended). The ADS8665IPWR requires a 16-TSSOP package, necessitating PCB layout modifications. The digital supply voltage range (1.65V to 5.25V) provides greater flexibility than the fixed 5V requirement of the ADS7818EB/2K5. Moisture sensitivity increases to MSL 3 (168 hours). Selection of the ADS8665IPWR is appropriate for applications requiring higher operating temperatures, input flexibility, or gain adjustment capabilities, provided PCB redesign is feasible.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can ADS7818EB/250 or ADS7818E/250 be used as direct replacements for ADS7818EB/2K5?

A: Yes, both parts are parametric equivalents with identical electrical specifications and package dimensions. The primary difference is packaging format (Cut Tape vs. Tape & Reel) and product status. Both substitute parts are designated Last Time Buy, indicating limited future availability. For new designs, the ADS7818EB/2K5 in Active status is recommended.

Q: What are the key differences between ADS7818EB/2K5 and ADS8665IPWR?

A: The ADS8665IPWR provides three primary enhancements: (1) extended operating temperature range to 125°C versus 85°C, (2) Programmable Gain Amplifier (PGA) for signal conditioning, and (3) expanded input flexibility supporting differential, pseudo-differential, and single-ended configurations. The ADS8665IPWR requires a 16-TSSOP package versus the 8-VSSOP package of the ADS7818EB/2K5, necessitating PCB layout changes. Digital supply voltage range is also expanded (1.65V to 5.25V).

Q: Are there pin-compatible alternatives to ADS7818EB/2K5?

A: ADS7818EB/250 and ADS7818E/250 are pin-compatible equivalents in the same 8-VSSOP package. The ADS8665IPWR is not pin-compatible, requiring a 16-pin package versus 8-pin.

Q: What is the significance of Last Time Buy status for ADS7818EB/250 and ADS7818E/250?

A: Last Time Buy designation indicates these parts are discontinued or approaching end-of-life. Inventory is limited and will not be replenished. These parts should be selected only when packaging format is critical and current inventory is sufficient for project requirements.

Q: Does ADS8665IPWR require firmware or software modifications?

A: The ADS8665IPWR maintains SPI interface compatibility with ADS7818EB/2K5. However, the addition of the Programmable Gain Amplifier requires software configuration to set gain levels. Firmware modifications may be necessary to utilize PGA functionality.

Q: What are the moisture handling requirements for each part?

A: ADS7818EB/2K5, ADS7818EB/250, and ADS7818E/250 are rated MSL 2 (1 Year), allowing one year of floor life after moisture barrier bag opening. ADS8665IPWR is rated MSL 3 (168 Hours), requiring more stringent moisture control with a 168-hour floor life limit.

Q: Can ADS7818EB/2K5 operate at temperatures above 85°C?

A: No. The ADS7818EB/2K5 is specified for -40°C to 85°C operation. For applications requiring higher temperature operation, the ADS8665IPWR supports -40°C to 125°C.