Part A
AD7631BSTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7102 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7631BSTZ and AD7631BSTZRL are functionally identical, differing only in packaging format (tray vs. tape and reel). Both share the same 18-bit SAR ADC core, 250 kSPS throughput, ±10 V input range, and 48-lead LQFP package, making the RL variant a direct drop-in replacement for automated assembly lines.
Resolution and Throughput
High match
Package Type
High match
Input Range
High match
Supply Voltage
High match
Parts at a glance
Part B
AD7631BSTZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6625 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 | AD7631BSTZ | AD7631BSTZRL | Why it matters |
|---|---|---|---|
| Resolution | 18 bits | 18 bits | Determines the quantization step and achievable dynamic range; identical resolution means equivalent measurement precision. |
| Sampling Rate | 670 kSPS | 670 kSPS | Sets the maximum throughput for the ADC; matching rates ensure the same signal bandwidth capability. |
| 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 design. |
| Supply Voltage (Analog) | 5 V | 5 V | Defines the analog input range and interface levels; identical supply requirements allow the same power design. |
| Interface | SPI / Parallel | SPI / Parallel | Determines host connectivity and firmware compatibility; matching interfaces enable direct board-level replacement. |
| Package / Case | 48-LQFP | 48-LQFP | Footprint and thermal characteristics must match for physical interchangeability on an existing PCB. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for the same environmental conditions, supporting use in identical applications. |
| Packaging / Ordering Format | Tray / Tube (individual) | Tape & Reel | The RL suffix denotes reel packaging for automated assembly; the electrical part is the same but handling and pick-and-place logistics differ. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7631BSTZ | AD7631BSTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 18 | 18 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, Parallel, DSP | SPI, Parallel, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between AD7631BSTZ and AD7631BSTZRL?
The AD7631BSTZ and AD7631BSTZRL are the same Analog Devices 18-bit, 670 kSPS PulSAR analog-to-digital converter in a 48-lead LQFP package. The suffix difference is packaging form: AD7631BSTZ is the standard tray/individual unit ordering code, while AD7631BSTZRL denotes a tape-and-reel packaging option. Both share identical electrical specifications and are specified over the −40°C to +85°C industrial temperature range.
Are AD7631BSTZ and AD7631BSTZRL electrically and functionally interchangeable?
Yes. Both ordering codes refer to the same silicon device, the AD7631, with identical pinout, resolution (18 bits), throughput (670 kSPS), and interface (parallel). The only difference is the shipping packaging (tray versus tape-and-reel), so they are functionally interchangeable in a given design.
Which package do AD7631BSTZ and AD7631BSTZRL use?
Both parts are supplied in a 48-lead LQFP (low-profile quad flat package). The "STZ" in the ordering code identifies the LQFP package and the RoHS-compliant, lead-free (Z) finish per Analog Devices ordering conventions.
What are the key performance specifications shared by AD7631BSTZ and AD7631BSTZRL?
Both are 18-bit successive-approximation (PulSAR) ADCs with a maximum throughput of 670 kSPS, a parallel digital interface, and operation from a 5 V analog supply with a separate 2.5 V to 5 V digital supply (VIO). They are specified for the industrial temperature range of −40°C to +85°C. Designers should confirm exact AC/DC performance limits against the official AD7631 datasheet.
Why would a designer choose the AD7631BSTZRL over the AD7631BSTZ?
The AD7631BSTZRL tape-and-reel option is intended for automated high-volume SMT assembly lines, where reels feed pick-and-place equipment efficiently. The AD7631BSTZ tray format is typically used for prototyping, low-volume runs, or manual handling. The choice is a manufacturing/logistics decision, not a performance one.
Do AD7631BSTZ and AD7631BSTZRL differ in RoHS or environmental compliance?
No. Both carry the "Z" suffix in the Analog Devices ordering code, which denotes RoHS-compliant, lead-free construction. Environmental compliance is identical between the two ordering codes.
Can AD7631BSTZ and AD7631BSTZRL be used in the same PCB footprint?
Yes. Because both are the same 48-lead LQFP device, the PCB land pattern, pinout, and footprint are identical. A board designed for one ordering code accepts the other without layout changes.