Part A
AD7865BSZ-1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5453 PCS
- Package
- QFP-44
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7865BSZ-1 and AD7865AS-2 are both four-channel simultaneous-sampling 14-bit ADCs from the AD7865 family, sharing the same 44-lead MQFP package and parallel interface, so they are functionally interchangeable in most designs. The BSZ-1 offers a faster 3.5 µs conversion time versus 5.2 µs on the AS-2, and the two grades differ in specified linearity and temperature range, so the AS-2 can generally substitute for the BSZ-1 where the tighter speed and accuracy grades are not mandatory, while the reverse direction requires validation against the faster timing and grade specifications.
Package Type
High match
Resolution and Channel Count
High match
Conversion Time
Validation required
Accuracy Grade
Validation required
Parts at a glance
Part B
AD7865AS-2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 128 PCS
- Package
- QFP-44
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7865BSZ-1 | AD7865AS-2 | Why it matters |
|---|---|---|---|
| Number of Channels | 4 | 4 | Channel count determines how many analog signals can be sampled simultaneously; both parts match here. |
| Resolution | 14 bit | 14 bit | Resolution sets the smallest measurable signal step; identical resolution supports equivalent measurement precision. |
| Sampling Rate | 175 kSPS | 175 kSPS | Maximum throughput affects the highest signal frequency that can be captured; matching rates allow direct substitution in timing-critical designs. |
| Input Type | Single-ended | Single-ended | Input configuration must match the sensor or signal source topology; both being single-ended means the same front-end circuitry applies. |
| Supply Voltage | 5 V | 5 V | Supply voltage must be compatible with the system power rail; identical 5 V operation allows drop-in replacement. |
| Interface | Parallel | Parallel | The digital interface determines how the ADC connects to the host processor; matching parallel interfaces preserve board-level compatibility. |
| Package / Mounting | 44-Lead MQFP | 44-Lead MQFP | Package and footprint must match for physical interchangeability; identical MQFP packages allow the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments where the part is guaranteed to meet specifications; matching ranges support equivalent application coverage. |
| Reference Type | Internal | Internal | An internal reference simplifies the design by removing external reference circuitry; both having internal references keeps the analog front-end identical. |
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 | AD7865BSZ-1 | AD7865AS-2 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 14 |
| Sampling Rate(Per Second) | 350k | 350k |
| Data Interface | Parallel | Parallel |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 4 | - |
| Input Type | Single Ended | - |
| Configuration | S/H-MUX-ADC | - |
| Ratio - S / H: ADC | 4:1 | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
| Features | Simultaneous Sampling | - |
Frequently asked questions
What are the key differences between the AD7865BSZ-1 and AD7865AS-2?
Both are 14-bit, 4-channel simultaneous-sampling ADCs from Analog Devices in a 44-lead MQFP package. The primary differences are grade and speed: the AD7865BSZ-1 is a B-grade device specified for 3.5 µs conversion time (fast option), while the AD7865AS-2 is an A-grade device specified for 5.5 µs conversion time (slow option). The B grade offers tighter linearity and dynamic performance specifications than the A grade.
Are the AD7865BSZ-1 and AD7865AS-2 pin-compatible?
Yes. Both devices are offered in the same 44-lead MQFP (MQFP-44) package with an identical pinout, so they are pin-compatible and share the same PCB land pattern.
What is the difference in throughput between the AD7865BSZ-1 and AD7865AS-2?
The AD7865BSZ-1 (fast option) has a specified conversion time of 3.5 µs, while the AD7865AS-2 (slow option) has a specified conversion time of 5.5 µs. Both are 14-bit, 4-channel simultaneous-sampling ADCs, so the faster conversion time of the BSZ-1 supports higher maximum throughput.
Do both parts support the same analog input ranges and supply requirements?
Yes. Both the AD7865BSZ-1 and AD7865AS-2 are 14-bit, 4-channel simultaneous-sampling ADCs with a +5 V single supply and on-chip track-and-hold, and both provide the same selectable analog input ranges and reference configuration per the AD7865 datasheet. The grade suffix affects performance specifications and speed, not the fundamental input/supply architecture.
Can the AD7865AS-2 be used as a drop-in replacement for the AD7865BSZ-1?
Because they are pin-compatible and share the same package and pinout, the AD7865AS-2 can be considered for substitution, but only after verifying that its A-grade specifications (including the 5.5 µs conversion time versus 3.5 µs for the BSZ-1) and its linearity/dynamic performance meet the target design requirements. The slower conversion time may reduce maximum throughput, so timing margins must be revalidated.
What package do the AD7865BSZ-1 and AD7865AS-2 use?
Both devices are supplied in a 44-lead MQFP (MQFP-44) package. The "BSZ" and "AS" designations refer to the device grade and temperature/performance class, not to different package types.
Which part should be selected for a higher-speed application?
The AD7865BSZ-1 should be selected when faster conversion is required, since its specified conversion time is 3.5 µs versus 5.5 µs for the AD7865AS-2. The B grade also carries tighter performance specifications, which is advantageous in demanding signal-chain designs.