ADS7812UB Equivalent & Substitute Parts

Part Overview

The ADS7812UB is a 12-bit Analog to Digital Converter manufactured by Texas Instruments, configured as a single-input SAR (Successive Approximation Register) device in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating end-of-life status with limited availability. The ADS7812UB operates at a 40 kHz sampling rate with external or internal reference voltage capability, designed for applications requiring single-ended analog signal acquisition with SPI digital interface.

Due to Last Time Buy status, identifying equivalent and substitute parts is necessary to ensure design continuity and long-term supply chain reliability.

Substiute Parts

ADS7812UB

Texas InstrumentsIn Stock: 1231ADS7812UB Datasheet

Current PartRFQ

ADS8665IPWR

Texas InstrumentsIn Stock: 15306ADS8665IPWR Datasheet

MFR RecommendedRFQ

ADS8512IBDW

Texas InstrumentsIn Stock: 1416ADS8512IBDW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7812UB are identified based on strict alignment with core electrical and mechanical parameters. The substitution logic is structured as follows:

Parametric Equivalent (Direct Replacement): ADS8512IBDW maintains identical specifications across all critical parameters: 12-bit resolution, 40 kHz sampling rate, single input, single-ended configuration, SPI interface, S/H-ADC configuration with 1:1 ratio, SAR architecture, dual reference capability (external and internal), 5V analog and digital supply voltages, and -40°C to 85°C operating range. Package type (16-SOIC) and mounting method (surface mount) are identical. This part qualifies as a direct parametric equivalent.

Manufacturer Recommended Substitute (MFR Recommended): ADS8665IPWR is designated as the manufacturer-recommended alternative. While maintaining 12-bit resolution, single input, SPI interface, and SAR architecture, this part introduces functional enhancements: 500 kHz sampling rate (12.5× faster), differential and pseudo-differential input capability (in addition to single-ended), PGA configuration with 0:1 S/H:ADC ratio, internal reference only, and extended operating temperature range (-40°C to 125°C). The package differs to 16-TSSOP (0.173", 4.40mm Width). Supply voltage ranges are expanded to 4.75V–5.25V (analog) and 1.65V–5.25V (digital), providing greater flexibility. This part is Active status with higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: ADS8512IBDW is the appropriate selection when design specifications require identical electrical and mechanical characteristics. This part maintains Last Time Buy status compatibility while offering Active product status, ensuring continued availability. Both parts carry ROHS3 compliance and equivalent moisture sensitivity ratings. Pin-to-pin compatibility and identical package footprint (16-SOIC) eliminate PCB redesign requirements.

For Enhanced Performance: ADS8665IPWR is suitable when design requirements can accommodate functional enhancements. The 12.5× increase in sampling rate (500 kHz versus 40 kHz) supports higher-bandwidth signal acquisition. Expanded input configuration options (differential and pseudo-differential modes) provide flexibility for noise-sensitive applications. Extended operating temperature range (-40°C to 125°C) supports broader environmental specifications. Internal reference-only configuration simplifies external component requirements. Active product status with higher inventory (15,200 pcs) ensures long-term supply security. Package transition from 16-SOIC to 16-TSSOP requires PCB layout modification but maintains surface mount compatibility.

Both substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the main part.

Frequently Asked Questions (FAQ)

Q: Can ADS8512IBDW replace ADS7812UB without PCB modifications?

A: Yes. ADS8512IBDW is pin-compatible and uses identical 16-SOIC packaging. No PCB layout changes are required. Electrical specifications are identical, including 12-bit resolution, 40 kHz sampling rate, single-ended input, SPI interface, and 5V supply requirements.

Q: What are the key differences between ADS8512IBDW and ADS8665IPWR?

A: ADS8512IBDW maintains identical specifications to ADS7812UB. ADS8665IPWR introduces enhanced performance: 500 kHz sampling rate (versus 40 kHz), differential input capability, PGA configuration, internal reference only, and extended temperature range (-40°C to 125°C). Package differs from 16-SOIC to 16-TSSOP, requiring PCB redesign.

Q: Why is ADS8665IPWR designated as manufacturer-recommended?

A: Texas Instruments recommends ADS8665IPWR as the forward-looking alternative for new designs. Active product status, higher sampling rate, expanded input modes, and extended temperature range provide design flexibility and long-term supply assurance compared to Last Time Buy status of ADS7812UB.

Q: Does package change from 16-SOIC to 16-TSSOP affect compatibility?

A: Yes. While both are 16-pin surface mount packages, 16-TSSOP has smaller pitch and different footprint dimensions (0.173" versus 0.295" width). PCB layout and footprint library updates are required. Pin assignments remain compatible with SPI interface.

Q: Are all three parts ROHS3 compliant?

A: Yes. ADS7812UB, ADS8512IBDW, and ADS8665IPWR are all ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Q: What is the inventory status difference?

A: ADS7812UB (Last Time Buy) has 1,135 pcs available. ADS8512IBDW (Active) has 1,395 pcs. ADS8665IPWR (Active) has 15,200 pcs, providing significantly higher availability for long-term supply planning.

Q: Can ADS8665IPWR operate with external reference voltage?

A: No. ADS8665IPWR supports internal reference only, unlike ADS7812UB and ADS8512IBDW which support both external and internal references. Design circuits requiring external reference voltage must use ADS8512IBDW.