Part A
AD977ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7094 PCS
- Package
- SOIC-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ARZ and AD977AR-REEL are functionally equivalent, sharing the same 16-bit ADC architecture, package, and electrical specifications; the only distinction is the delivery format, with the REEL variant supplied on tape and reel for automated assembly. Both parts are interchangeable in design and production, and the REEL option is recommended where high-volume pick-and-place manufacturing is used.
Resolution and Architecture
High match
Package Type
High match
Electrical Specifications
High match
Delivery Format
High match
Parts at a glance
Part B
AD977AR-REEL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6894 PCS
- Package
- SOIC-20
- 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 | AD977ARZ | AD977AR-REEL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the quantization accuracy and dynamic range of the ADC; both parts must match for functional substitutability. |
| Sampling Rate | 100 kSPS | 100 kSPS | Sets the maximum conversion throughput; identical rates ensure the parts are interchangeable in the same signal chain timing. |
| Number of Inputs / Channels | 1 single-ended | 1 single-ended | Defines how many analog signals can be digitized; matching channel configuration is required for drop-in replacement. |
| Architecture | SAR | SAR | The converter architecture affects latency, linearity, and power behavior; identical architecture preserves system performance. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Confirms power-rail compatibility so the replacement operates correctly in the existing board design. |
| Interface Type | Parallel (byte/word) | Parallel (byte/word) | The digital output format must match the host controller's bus to avoid redesign of the interface logic. |
| Package / Mounting | 28-lead SOIC (SOIC_W), surface mount | 28-lead SOIC (SOIC_W), surface mount | Identical package and footprint allow the part to be soldered onto the same PCB land pattern without modification. |
| Packaging / Delivery Form | Tube / individual | Tape and reel | The delivery form differs (tube vs. reel), which affects automated assembly handling but not the electrical function of the device. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure both parts meet the same environmental requirements in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ARZ | AD977AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| 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 AD977ARZ and AD977AR-REEL?
Both parts are the same AD977 16-bit, 100 kSPS bipolar input ADC from Analog Devices. The AD977ARZ is supplied in a 20-lead SOIC (R-20) package in tube form, while AD977AR-REEL is the same device supplied on tape and reel for automated assembly. The electrical specifications are identical; only the packaging and shipping format differ.
Are AD977ARZ and AD977AR-REEL electrically and functionally interchangeable?
Yes. Both order codes refer to the same silicon die and package (20-lead SOIC, R-20), so they share identical resolution (16 bits), throughput (100 kSPS), input range (±10 V bipolar), and interface (parallel). They can be used interchangeably in the same PCB design; the choice depends only on the assembly method (tube vs. tape and reel).
What are the key specifications of the AD977?
The AD977 is a 16-bit, 100 kSPS successive-approximation ADC with a bipolar ±10 V input range, a parallel 16-bit output interface, and operation from +5 V analog and digital supplies. It is specified for the industrial temperature range and is available in a 20-lead SOIC package. These parameters are common to both AD977ARZ and AD977AR-REEL.
Does the AD977AR-REEL come in a different package than the AD977ARZ?
No. Both the AD977ARZ and AD977AR-REEL use the same 20-lead SOIC (R-20) package. The "REEL" suffix only indicates tape-and-reel packaging for pick-and-place assembly, not a different package or die.
Which part should be selected for high-volume automated assembly?
AD977AR-REEL is the appropriate choice for high-volume automated SMT assembly because it is supplied on tape and reel, which is compatible with pick-and-place equipment. AD977ARZ, supplied in tubes, is typically used for prototyping, low-volume, or manual assembly.
Are the AD977ARZ and AD977AR-REEL RoHS compliant?
Yes. The "Z" suffix in both order codes denotes a RoHS-compliant, lead-free (Pb-free) package from Analog Devices. Both AD977ARZ and AD977AR-REEL are RoHS-compliant versions of the AD977.
Can AD977ARZ and AD977AR-REEL be mixed on the same production line?
Yes, because they are the same device in the same package. However, the feeding method differs: AD977ARZ is supplied in tubes and AD977AR-REEL on tape and reel. The assembly line's feeder setup must match the packaging format being used; the devices themselves are identical.
What is the moisture sensitivity level (MSL) of these parts?
Both AD977ARZ and AD977AR-REEL are supplied in the same 20-lead SOIC package and share the same moisture sensitivity level as specified in the Analog Devices datasheet and packaging information. The MSL rating is a property of the package and is therefore identical for both order codes.