ADS7807U Equivalent & Substitute Parts

Part Overview

The ADS7807U is a 16-bit Analog to Digital Converter manufactured by Texas Instruments, designed for single-ended input data acquisition applications. It features a SAR (Successive Approximation Register) architecture with a 40 kHz sampling rate, operating from a 5V supply in a 28-SOIC surface mount package. The device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for new production runs and long-term system support.

Key Parameters

Parameter	Value
Number of Bits	16
Sampling Rate (Per Second)	40k
Number of Inputs	1
Input Type	Single Ended
Data Interface	SPI, Parallel
Architecture	SAR
Reference Type	External, Internal
Voltage - Supply, Analog	5V
Voltage - Supply, Digital	5V
Operating Temperature	-40°C ~ 85°C
Package / Case	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ADS7807U is determined by the following critical parameters: resolution (16 bits), sampling rate (40 kHz minimum), single-ended input capability, SAR architecture, 5V analog and digital supply compatibility, and 28-SOIC package format. Substitute parts must maintain functional equivalence across these core specifications to ensure direct replacement without circuit redesign.

The substitute parts are grouped as follows:

Direct Equivalents (Package and Pin-Compatible): ADS8507IBDW and ADS8507IDW maintain identical electrical specifications and 28-SOIC packaging, enabling direct board-level substitution.

Manufacturer-Recommended Alternative (Enhanced Performance): ADS8685IPWR offers superior specifications including 500 kHz sampling rate and integrated PGA functionality, but requires package migration from 28-SOIC to 16-TSSOP and circuit layout modifications.

Parameter Comparison

Parameter	ADS7807U	ADS8507IBDW	ADS8507IDW	ADS8685IPWR
Number of Bits	16	16	16	16
Sampling Rate (Per Second)	40k	40k	40k	500k
Number of Inputs	1	1	1	1
Input Type	Single Ended	Single Ended	Single Ended	Pseudo-Differential, Single Ended
Data Interface	SPI, Parallel	SPI, Parallel	SPI, Parallel	SPI
Architecture	SAR	SAR	SAR	SAR
Reference Type	External, Internal	External, Internal	External, Internal	External, Internal
Voltage - Supply, Analog	5V	5V	5V	5V
Voltage - Supply, Digital	5V	5V	5V	1.65V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	28-SOIC	28-SOIC	28-SOIC	16-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification): Select ADS8507IBDW or ADS8507IDW. Both parts are in Active product status with full ROHS3 compliance and identical electrical and mechanical specifications to the ADS7807U. ADS8507IBDW offers improved moisture sensitivity rating (MSL 2 vs. MSL 3), providing enhanced reliability in humid storage and assembly environments. ADS8507IDW provides equivalent performance with standard moisture sensitivity. Both maintain the 28-SOIC package format, enabling drop-in substitution on existing PCB layouts.

For Enhanced Performance Applications: ADS8685IPWR is the manufacturer-recommended alternative, offering 12.5× higher sampling rate (500 kHz) and extended operating temperature range (-40°C to 125°C). This part requires PCB redesign due to package migration from 28-SOIC to 16-TSSOP and reduced pin count. The ADS8685IPWR supports pseudo-differential input configuration and integrated programmable gain amplifier (PGA), providing additional signal conditioning capabilities. Digital supply voltage flexibility (1.65V to 5.25V) enables integration with mixed-signal systems. This option is suitable for new designs requiring higher bandwidth or legacy system upgrades where circuit modification is acceptable.

Frequently Asked Questions (FAQ)

Q: Can ADS8507IBDW and ADS8507IDW be used interchangeably with ADS7807U?

A: Yes. Both parts maintain identical electrical specifications (16-bit resolution, 40 kHz sampling rate, 5V supply), SAR architecture, single-ended input configuration, and 28-SOIC package format. They are pin-compatible and require no circuit modifications for direct substitution.

Q: What is the primary difference between ADS8507IBDW and ADS8507IDW?

A: The primary difference is moisture sensitivity level (MSL). ADS8507IBDW has MSL 2 (1 Year shelf life), while ADS8507IDW has MSL 2 (1 Year shelf life). Both provide equivalent electrical performance and package compatibility.

Q: Why is ADS8685IPWR listed as a manufacturer-recommended alternative if it requires circuit redesign?

A: ADS8685IPWR is recommended for new designs or system upgrades where enhanced performance justifies redesign effort. It provides 500 kHz sampling rate (12.5× faster), extended temperature range to 125°C, and integrated PGA functionality. However, the 16-TSSOP package requires PCB layout changes and firmware adaptation for SPI-only interface (parallel interface not available).

Q: Is the ADS8685IPWR compatible with existing ADS7807U PCB layouts?

A: No. The ADS8685IPWR uses a 16-TSSOP package versus the 28-SOIC package of the ADS7807U. Pin count and pinout differ significantly, requiring complete PCB redesign and firmware modifications to accommodate the SPI-only data interface.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. ADS8507IBDW, ADS8507IDW, and ADS8685IPWR are all ROHS3 compliant, matching the environmental compliance status of the ADS7807U.

Q: What is the inventory status of substitute parts?

A: ADS8507IBDW has 1102 units in stock, ADS8507IDW has 2280 units in stock, and ADS8685IPWR has 17851 units in stock. All parts are available as new original components.

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