Part A
AD977ABRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4556 Stückzahl
- Package
- SOIC-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRZ is a functionally compatible replacement candidate for the AD977ABR, as both parts share the same 16-bit ADC architecture, pinout, and package configuration. The primary distinction is the RoHS-compliant lead-free construction of the AD977ABRZ versus the lead-containing AD977ABR, which should be validated against your assembly and compliance requirements before substitution.
Resolution and Architecture
High match
Package and Pinout
High match
RoHS Compliance
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD977ABR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7383 Stückzahl
- Package
- SOIC-20
- 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 | AD977ABRZ | AD977ABR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide the same 16-bit resolution, so accuracy and dynamic range are equivalent. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical maximum throughput means either part supports the same signal bandwidth and system timing. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Same single-channel architecture allows direct substitution in the signal chain. |
| Interface Type | Parallel (SPI/QSPI/MICROWIRE compatible) | Parallel (SPI/QSPI/MICROWIRE compatible) | Matching digital interface ensures the same host controller and firmware can be reused. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Same supply requirements mean no power-rail redesign is needed when swapping parts. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SOIC (surface mount) | Identical package and footprint allow drop-in replacement on the same PCB. |
| RoHS / Lead-Free Status | RoHS compliant (lead-free, Z suffix) | Non-RoHS (contains lead) | The Z suffix denotes lead-free/RoHS compliance, which affects regulatory compliance and solder process selection. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures equivalent environmental robustness. |
| INL (Integral Nonlinearity) | ±2.0 LSB max | ±2.0 LSB max | Identical linearity specification means conversion accuracy is unchanged between the two parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRZ | AD977ABR |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| 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 AD977ABRZ and AD977ABR?
The AD977ABRZ is the RoHS-compliant, lead-free (Pb-free) version of the AD977ABR. Both are 16-bit, 100 kSPS bipolar input ADCs from Analog Devices in a 28-lead SOIC package. The "Z" suffix in AD977ABRZ denotes the lead-free/RoHS-compliant package variant, while AD977ABR is the older lead-containing (SnPb) package version. Functionally and electrically, the two parts are identical.
Are AD977ABRZ and AD977ABR electrically and functionally interchangeable?
Yes. Both devices share the same die, specifications, and pinout: 16-bit resolution, 100 kSPS throughput, bipolar ±10 V input range, and a 28-lead SOIC (R-28) package. The only documented difference is the package finish (lead-free vs. leaded). They are interchangeable in function, but the AD977ABRZ should be used for RoHS-compliant assemblies.
Do AD977ABRZ and AD977ABR have the same package and pinout?
Yes. Both are offered in the same 28-lead SOIC package (Analog Devices package code R-28) with identical pin assignments. PCB land patterns and footprint are the same for both variants, so no layout change is required when switching between them.
What are the key specifications of the AD977ABRZ/AD977ABR?
Both are 16-bit successive-approximation ADCs with 100 kSPS maximum throughput, a bipolar ±10 V input range, an internal 2.5 V reference, and a parallel 16-bit interface. They operate from a +5 V analog supply and a +5 V digital supply (with a separate VDRIVE for the digital interface). The AD977A grade offers ±2 LSB INL maximum. These parameters are common to both the AD977ABR and AD977ABRZ.
Is the AD977ABRZ RoHS compliant while the AD977ABR is not?
Yes. The "Z" suffix designates the RoHS-compliant, lead-free package finish. The AD977ABR uses a lead-containing (SnPb) finish and is not RoHS compliant. For new designs requiring RoHS compliance, the AD977ABRZ is the appropriate ordering option.
Can AD977ABR be used as a drop-in replacement for AD977ABRZ in an existing RoHS assembly?
Electrically and mechanically they are drop-in compatible, but substituting the non-RoHS AD977ABR into a RoHS-compliant assembly would violate RoHS compliance of the finished product. For RoHS assemblies, the AD977ABRZ should be retained. The reverse substitution (AD977ABRZ in place of AD977ABR) is functionally acceptable where lead-free processing is permitted.
Do both parts require the same external components and reference configuration?
Yes. Because both variants use the same silicon and pinout, the external component requirements are identical: the internal 2.5 V reference may be used or an external reference applied, and the same decoupling, REF, and input amplifier configurations apply to both. No changes to the supporting circuitry are needed when selecting between the two package finishes.