ADS7806UB Equivalent & Substitute Parts

Part Overview

The ADS7806UB 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 a 28-SOIC surface mount package. This component operates with 40k samples per second and supports both SPI and parallel data interfaces with external or internal reference voltage options.

The ADS7806UB is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure continued design support, maintain supply chain continuity, and enable new production runs with active components.

Key Parameters

Parameter	Value
Resolution (Bits)	12
Sampling Rate	40k SPS
Number of Inputs	1
Input Type	Single Ended
Data Interface	SPI, Parallel
Architecture	SAR
Package	28-SOIC
Analog Supply Voltage	5V
Digital Supply Voltage	5V
Operating Temperature Range	-40°C to 85°C
Reference Type	External, Internal

Substitute Part Grouping Explanation

Substitute parts for the ADS7806UB are identified based on strict electrical and mechanical compatibility criteria:

Parametric Equivalent (ADS8506IBDW): This substitute maintains identical core specifications including 12-bit resolution, 40k SPS sampling rate, single-ended input configuration, SPI/parallel interface support, and 28-SOIC packaging. Both analog and digital supply voltages remain at 5V with matching operating temperature range (-40°C to 85°C). The ADS8506IBDW is functionally interchangeable at the circuit level and requires no design modifications.

Manufacturer Recommended Substitute (ADS8665IPWR): This part shares the 12-bit resolution and SAR architecture but introduces functional enhancements and package differences. The ADS8665IPWR operates at 500k SPS (12.5× faster sampling), supports differential and pseudo-differential inputs in addition to single-ended, includes an integrated PGA (Programmable Gain Amplifier), and uses SPI interface only. The package changes to 16-TSSOP with reduced pin count. This substitute is suitable for designs requiring higher sampling rates and advanced input flexibility, though circuit redesign may be necessary due to package and interface differences.

Parameter Comparison

Parameter	ADS7806UB (Main)	ADS8506IBDW (Parametric Equivalent)	ADS8665IPWR (Recommended Substitute)
Resolution	12-bit	12-bit	12-bit
Sampling Rate	40k SPS	40k SPS	500k SPS
Number of Inputs	1	1	1
Input Type	Single Ended	Single Ended	Differential, Pseudo-Differential, Single Ended
Data Interface	SPI, Parallel	SPI, Parallel	SPI
Architecture	SAR	SAR	SAR
Package	28-SOIC	28-SOIC	16-TSSOP
Analog Supply Voltage	5V	5V	4.75V to 5.25V
Digital Supply Voltage	5V	5V	1.65V to 5.25V
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C
Reference Type	External, Internal	External, Internal	Internal
Product Status	Last Time Buy	Active	Active
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

For Direct Replacement: Select the ADS8506IBDW when maintaining existing circuit designs and PCB layouts. This parametric equivalent provides identical electrical performance and package footprint, eliminating redesign requirements. The ADS8506IBDW carries Active product status with improved moisture sensitivity rating (MSL 2 vs. MSL 3), ensuring superior long-term reliability and storage stability.

For Enhanced Performance Applications: Select the ADS8665IPWR when design specifications permit package and interface modifications. This part delivers 12.5× higher sampling rate capability and extended operating temperature range (-40°C to 125°C), supporting more demanding signal acquisition scenarios. The integrated PGA and expanded input configuration options provide additional design flexibility. Circuit redesign is required due to 16-TSSOP packaging and SPI-only interface.

Both substitute parts maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory and supply chain continuity with the original ADS7806UB.

Frequently Asked Questions (FAQ)

Q: Can the ADS8506IBDW replace the ADS7806UB without PCB modifications?

A: Yes. The ADS8506IBDW is a parametric equivalent with identical pin count (28), package type (28-SOIC), electrical specifications, and interface protocols. No PCB layout changes are required.

Q: What are the key differences between the ADS8506IBDW and ADS8665IPWR?

A: The ADS8506IBDW maintains 1:1 pin and functional compatibility with the ADS7806UB. The ADS8665IPWR introduces a smaller 16-TSSOP package, 12.5× faster sampling rate (500k vs. 40k SPS), integrated PGA, support for differential inputs, and SPI-only interface. The ADS8665IPWR requires circuit redesign.

Q: Is the ADS8665IPWR suitable for applications requiring 40k SPS sampling?

A: Yes. The ADS8665IPWR operates at 500k SPS maximum, which exceeds the 40k SPS requirement of the original design. Applications can operate this device at lower effective sampling rates through firmware control.

Q: What is the moisture sensitivity impact of selecting the ADS8506IBDW?

A: The ADS8506IBDW carries MSL 2 rating (1 Year shelf life) compared to the ADS7806UB MSL 3 rating (168 Hours). This represents improved moisture resistance and extended storage capability without special handling.

Q: Can the ADS8665IPWR operate with 5V single supply like the original part?

A: Yes. The ADS8665IPWR digital supply accepts 1.65V to 5.25V and analog supply accepts 4.75V to 5.25V, supporting standard 5V single-supply operation. The wider voltage tolerance provides additional design margin.

Q: Are all three parts (ADS7806UB, ADS8506IBDW, ADS8665IPWR) RoHS compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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