Part A
AD7677ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1648 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7677ASTZ and AD7677ASTRL are functionally equivalent implementations of the same 16-bit, 1 MSPS successive-approximation ADC, differing only in packaging format and shipment configuration. Both share identical die, electrical specifications, and temperature ratings, making them interchangeable for design and qualification purposes; the choice between them is driven solely by production packaging and inventory requirements rather than by any functional or parametric distinction.
Resolution and Sampling Rate
High match
Package Type
High match
Operating Temperature Range
High match
Shipment Packaging Format
Validation required
Parts at a glance
Part B
AD7677ASTRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5280 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7677ASTZ | AD7677ASTRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Determines the quantization step and achievable dynamic range; identical resolution means equivalent measurement precision. |
| Sampling Rate | 1 MSPS | 1 MSPS | Sets the maximum throughput for the ADC; matching rates ensure the same signal bandwidth can be captured. |
| Architecture | SAR | SAR | Successive-approximation architecture defines latency, power, and no-cycle-latency behavior; identical architecture supports drop-in substitution. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and noise immunity; matching input topology preserves signal-chain compatibility. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Confirms the same power rails are required, so no supply redesign is needed when swapping parts. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | The digital interface must match the host controller; identical parallel interface ensures firmware and pinout compatibility. |
| Package / Mounting | 48-LQFP, surface mount | 48-LQFP, surface mount | Same package and footprint allow the parts to be used interchangeably on the same PCB layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures both parts meet the same environmental requirements for industrial-grade applications. |
| Packaging / Ordering Format | Tray / tube (individual) | Tape and reel | The RL suffix denotes reel packaging for automated assembly, while the Z variant is supplied in trays; this affects manufacturing handling but not electrical function. |
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 | AD7677ASTZ | AD7677ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Data Interface | SPI, Parallel, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What is the difference between AD7677ASTZ and AD7677ASTRL?
Both are the same Analog Devices AD7677 16-bit, 1 MSPS successive-approximation ADC in a 48-lead LQFP package. The difference is packaging format: AD7677ASTZ is supplied in tray packaging, while AD7677ASTRL is supplied in tape-and-reel packaging for automated assembly. The electrical and functional specifications are identical.
Are AD7677ASTZ and AD7677ASTRL electrically and functionally interchangeable?
Yes. Both part numbers refer to the same AD7677 silicon die and package type (48-lead LQFP), so they share identical resolution (16-bit), sampling rate (1 MSPS), analog input range, and interface specifications. They differ only in shipping/packaging format, not in device performance.
What are the key performance specifications of the AD7677?
The AD7677 is a 16-bit, 1 MSPS SAR ADC with a pseudo-differential analog input, an on-chip track-and-hold, and a parallel interface. It operates from a 5 V analog supply with a separate digital supply, and is specified for the industrial temperature range. Refer to the official Analog Devices datasheet for exact INL, SNR, and THD limits.
Which package do AD7677ASTZ and AD7677ASTRL use?
Both devices are offered in the 48-lead LQFP (low-profile quad flat package). The "ST" in the part number designates the LQFP package, and the "Z" suffix indicates RoHS-compliant lead finish per Analog Devices ordering conventions.
When should I choose AD7677ASTRL instead of AD7677ASTZ?
Choose AD7677ASTRL (tape-and-reel) when using automated pick-and-place SMT assembly lines that require reel-fed components. Choose AD7677ASTZ (tray) for prototyping, low-volume hand assembly, or when tray handling is preferred. The choice is purely a manufacturing/packaging decision.
Are AD7677ASTZ and AD7677ASTRL RoHS compliant?
Yes. The "Z" suffix in both part numbers denotes the RoHS-compliant version per Analog Devices ordering guide. Confirm the current compliance status on the official Analog Devices product page or an authorized distributor listing before finalizing a design.
What is the typical application of the AD7677?
The AD7677 is used in applications requiring high-speed, high-resolution data acquisition, such as medical imaging, instrumentation, spectrum analyzers, and industrial process control. Its 16-bit resolution at 1 MSPS suits precision signal chains where both accuracy and throughput matter.