Part A
AD7865BSZ-1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5453 Stückzahl
- Package
- QFP-44
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7865BSZ-1 and AD7865AS-1 are functionally interchangeable four-channel simultaneous-sampling 14-bit ADCs sharing the same package, pinout, and core architecture. The BSZ-1 grade offers a higher guaranteed throughput of 350 kSPS versus 250 kSPS for the AS-1, so the BSZ-1 can directly replace the AS-1 in most designs, while substituting the AS-1 for the BSZ-1 requires validating that the system timing margin accommodates the lower conversion rate.
Package Type
High match
Pin Configuration
High match
Throughput Rate
Validation required
Resolution and Input Architecture
High match
Parts at a glance
Part B
AD7865AS-1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3235 Stückzahl
- Package
- QFP-44
- 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 | AD7865BSZ-1 | AD7865AS-1 | Why it matters |
|---|---|---|---|
| Manufacturer Part Number | AD7865BSZ-1 | AD7865AS-1 | The B-grade and A-grade suffixes denote different performance grades of the same converter family, which affects accuracy and temperature specifications. |
| Grade / Accuracy Class | B grade (higher performance) | A grade (standard performance) | The grade determines guaranteed linearity and accuracy limits; substituting a lower grade may violate system error budgets. |
| INL (Integral Nonlinearity) | ±1 LSB max (B grade) | ±1.5 LSB max (A grade) | INL directly bounds conversion accuracy; a looser INL in the A grade can reduce measurement precision in precision applications. |
| DNL (Differential Nonlinearity) | ±1 LSB max (B grade) | ±1 LSB max (A grade) | DNL guarantees monotonicity and no missing codes; identical DNL means both grades preserve code behavior. |
| Operating Temperature Range | -40°C to +85°C (industrial) | -40°C to +85°C (industrial) | Both parts share the same industrial temperature range, so thermal environment requirements are interchangeable. |
| Resolution | 14-bit | 14-bit | Identical resolution means both parts provide the same quantization step and dynamic range for the signal chain. |
| Number of Input Channels | 4 single-ended / 2 differential | 4 single-ended / 2 differential | Matching channel count and configuration ensures the same sensor interface and PCB routing can be reused. |
| Package / Mounting | 44-lead MQFP (surface mount) | 44-lead MQFP (surface mount) | Identical package and footprint allow drop-in replacement without layout changes. |
| Supply Voltage | 5 V single supply | 5 V single supply | Same supply requirement means the existing power design supports either grade without modification. |
| Interface | Parallel (12-bit/14-bit word) | Parallel (12-bit/14-bit word) | A matching parallel interface ensures the same microcontroller or DSP bus timing and firmware can be used. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7865BSZ-1 | AD7865AS-1 |
|---|---|---|
| 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-1?
Both are 14-bit, 4-channel simultaneous-sampling ADCs from Analog Devices in a 44-lead MQFP package. The primary difference is the grade: the AD7865BSZ-1 is specified for the industrial temperature range of −40°C to +85°C, while the AD7865AS-1 is specified for 0°C to +70°C. The "B" grade also carries tighter guaranteed specifications than the "A" grade per the datasheet.
Are the AD7865BSZ-1 and AD7865AS-1 pin-compatible?
Yes. Both devices are offered in the same 44-lead MQFP (MQFP-44) package with identical pinout, so they are pin-compatible and share the same PCB land pattern.
Do the AD7865BSZ-1 and AD7865AS-1 have the same resolution and throughput?
Yes. Both are 14-bit successive-approximation ADCs with four simultaneously sampled input channels and a maximum throughput of 350 kSPS, as specified in the AD7865 datasheet.
What is the operating temperature range of each part?
The AD7865BSZ-1 is rated for −40°C to +85°C (industrial grade). The AD7865AS-1 is rated for 0°C to +70°C (commercial grade). Designs exposed to sub-zero or elevated ambient temperatures should use the B-grade device.
Can the AD7865AS-1 be used as a drop-in replacement for the AD7865BSZ-1?
Electrically and mechanically they are compatible, but the AS-1 is only guaranteed over 0°C to +70°C and has looser guaranteed specifications than the BSZ-1. Substitution is acceptable only if the application stays within the commercial temperature range and the system tolerates the A-grade specification limits.
What analog input configuration do these ADCs support?
Both parts provide four analog input channels that are sampled simultaneously, with a high-speed parallel interface for reading conversion results. Refer to the AD7865 datasheet for the exact input voltage range and reference configuration of each model.
Which part should be selected for an industrial application?
The AD7865BSZ-1 is the appropriate choice for industrial environments because its −40°C to +85°C temperature rating and tighter B-grade specifications cover conditions outside the 0°C to +70°C range of the AD7865AS-1.