Part A
AD7811YRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7280 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7811YRUZ is a functionally compatible replacement candidate for the AD7811YRU, differing only in the package finish (RoHS-compliant versus non-RoHS). Both parts share the same core ADC architecture, channel count, and package footprint, so the substitution is viable for most designs, with the primary consideration being compliance requirements rather than electrical performance.
Resolution and Architecture
High match
Channel Count
High match
Package Type
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD7811YRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1568 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7811YRUZ | AD7811YRU | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 4 | 4 | Determines how many analog signals can be sampled; must match for functional substitutability. |
| Resolution | 10 bit | 10 bit | Sets the measurement precision; identical resolution ensures equivalent accuracy in the application. |
| Sampling Rate | 350 kSPS | 350 kSPS | Defines maximum conversion throughput; must be equal to preserve system timing performance. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Must be compatible with the system power rail for the part to operate correctly. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Determines compatibility with the host microcontroller or DSP communication bus. |
| Package / Case | 16-TSSOP | 16-TSSOP | Footprint and pinout must match for drop-in board replacement. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method must match the PCB manufacturing process. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free | Non-RoHS, contains lead | Affects regulatory compliance and solder process; the Z suffix denotes the lead-free variant. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Must cover the application's environmental conditions for reliable operation. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7811YRU | AD7811YRUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Number of Bits | 10 | 10 |
| Sampling Rate(Per Second) | 350k | 350k |
| Data Interface | SPI, DSP | DSP |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Number of Inputs | - | 3, 4 |
| Input Type | - | Pseudo-Differential, Single Ended |
| Configuration | - | MUX-S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Architecture | - | SAR |
| Reference Type | - | External, Internal |
| Voltage - Supply, Analog | - | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | - | 2.7V ~ 5.5V |
Frequently asked questions
What is the difference between AD7811YRUZ and AD7811YRU?
The AD7811YRUZ and AD7811YRU are functionally identical 10-bit, 4-channel sampling ADCs from Analog Devices. The primary difference is the suffix "Z," which indicates that the AD7811YRUZ is a lead-free (Pb-free) and RoHS-compliant version of the AD7811YRU, which contains lead in its package termination finish.
Are the AD7811YRUZ and AD7811YRU pin-compatible?
Yes. Both devices are offered in the same 16-lead TSSOP package and share an identical pinout. The "Z" suffix denotes a change in the package's lead finish and material composition for environmental compliance, not a change in pin function or package dimensions.
Can the AD7811YRUZ be used as a direct drop-in replacement for the AD7811YRU?
Yes, from an electrical and functional standpoint, the AD7811YRUZ is a direct replacement for the AD7811YRU. They share the same specifications, including a 10-bit resolution, 4 single-ended/3 pseudo-differential input channels, and a 2.7 V to 5.5 V supply range. The only consideration is the RoHS compliance of the "Z" version.
What is the function of the "Z" suffix in the AD7811YRUZ part number?
In Analog Devices' nomenclature, the "Z" suffix designates that the component is RoHS-compliant and uses a lead-free termination finish. This is a standard environmental designation and does not affect the device's electrical performance or datasheet specifications.
Do both parts have the same operating temperature range?
Yes. Both the AD7811YRUZ and AD7811YRU are specified for the industrial temperature range of -40°C to +85°C, as indicated by the "Y" grade in the part number.
Are the AD7811YRUZ and AD7811YRU electrically identical?
Yes. The datasheet parameters for both parts are identical. They both feature a 10-bit successive-approximation ADC, a conversion time of 2.3 µs, and an on-chip track-and-hold amplifier. The "Z" designation only affects the package's material compliance, not its electrical characteristics.
Which part should be selected for a new design?
For new designs, the AD7811YRUZ is generally recommended because it is the RoHS-compliant, lead-free version. This helps ensure compliance with global environmental regulations and is the standard offering for current production. The AD7811YRU may still be available for existing designs that have already been qualified with the leaded version.