AD7771-4BCPZ Equivalent & Substitute Parts

Part Overview

The AD7771-4BCPZ is a 24-bit Sigma-Delta analog-to-digital converter manufactured by Analog Devices Inc., designed for high-resolution data acquisition applications. This device features 8 differential or single-ended input channels with simultaneous sampling capability and SPI data interface. The part is currently in active production status with 996 units available in new original inventory. Finding equivalent substitute parts is necessary to ensure supply chain flexibility, optimize procurement timelines, and maintain design continuity when primary inventory becomes constrained.

Key Parameters

Parameter	Value
Resolution (Bits)	24
Sampling Rate	32 kSPS
Number of Input Channels	8
Input Type	Differential, Single Ended
Data Interface	SPI
Architecture	Sigma-Delta
Number of A/D Converters	8
Analog Supply Voltage	±1.65V, 2.2V ~ 3.6V
Digital Supply Voltage	1.8V ~ 3.6V
Reference Type	External, Internal
Operating Temperature Range	-40°C ~ 125°C
Package Type	64-WFQFN Exposed Pad, CSP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AD7771-4BCPZ is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part AD7771BCPZ maintains identical specifications across resolution, sampling rate, input channel count, input type configuration, data interface protocol, converter architecture, supply voltage ranges, reference type options, operating temperature range, and package form factor. Both parts share the same base product number (AD7771) and are manufactured by Analog Devices Inc. The primary distinction between these parts is packaging format: the main part (AD7771-4BCPZ) is supplied in tape format, while the substitute (AD7771BCPZ) is supplied in tray format. This packaging difference does not affect electrical performance or functional compatibility. Both parts maintain identical RoHS3 compliance and MSL ratings.

Parameter Comparison

Parameter	AD7771-4BCPZ (Main Part)	AD7771BCPZ (Substitute)	Match Status
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Identical
Resolution (Bits)	24	24	Identical
Sampling Rate (kSPS)	32	32	Identical
Input Channels	8	8	Identical
Input Type	Differential, Single Ended	Differential, Single Ended	Identical
Data Interface	SPI	SPI	Identical
Architecture	Sigma-Delta	Sigma-Delta	Identical
A/D Converters	8	8	Identical
Analog Supply Voltage	±1.65V, 2.2V ~ 3.6V	±1.65V, 2.2V ~ 3.6V	Identical
Digital Supply Voltage	1.8V ~ 3.6V	1.8V ~ 3.6V	Identical
Reference Type	External, Internal	External, Internal	Identical
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Identical
Package / Case	64-WFQFN Exposed Pad, CSP	64-WFQFN Exposed Pad, CSP	Identical
Supplier Device Package	64-LFCSP (9x9)	64-LFCSP (9x9)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Active	Active	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	3 (168 Hours)	3 (168 Hours)	Identical
Packaging Format	Tape	Tray	Different
Current Inventory	996 Pcs	1310 Pcs	Different

Engineering Selection Recommendations

The AD7771BCPZ serves as a direct parametric equivalent to the AD7771-4BCPZ for all electrical and functional applications. Both parts are manufactured by Analog Devices Inc. and maintain active product status with full ROHS3 compliance and identical MSL ratings. Selection between these parts should be based on packaging and logistics requirements. The AD7771BCPZ offers higher current inventory availability (1310 units versus 996 units), making it suitable for applications where supply chain continuity is a priority. The tray packaging format of the AD7771BCPZ may require different handling procedures during assembly compared to tape format, but this does not affect electrical performance or board-level compatibility. Both parts are suitable for high-resolution data acquisition systems requiring 24-bit resolution, 8-channel simultaneous sampling, and SPI interface connectivity across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can AD7771BCPZ be used as a direct replacement for AD7771-4BCPZ in existing designs?

A: Yes. The AD7771BCPZ is electrically and functionally identical to the AD7771-4BCPZ. All electrical parameters, pin configurations, and performance specifications are equivalent. The only difference is the packaging format (tray versus tape), which does not affect circuit operation or board-level integration.

Q: What is the difference between tape and tray packaging?

A: Tape packaging (AD7771-4BCPZ) supplies components on continuous carrier tape suitable for automated pick-and-place equipment. Tray packaging (AD7771BCPZ) supplies components in static-dissipative trays, typically used for manual handling or alternative assembly processes. Both formats contain the same component with identical electrical specifications.

Q: Are there any compatibility concerns when switching between these parts?

A: No compatibility concerns exist. Both parts use the 64-LFCSP (9x9) package with identical pin assignments, electrical characteristics, and functional behavior. PCB layout, schematic connections, and firmware remain unchanged.

Q: Do both parts meet the same compliance and certification standards?

A: Yes. Both AD7771-4BCPZ and AD7771BCPZ are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings of 3 (168 Hours). Both parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection should be based on procurement availability and packaging logistics. The AD7771BCPZ currently has higher inventory availability, which may provide supply chain advantages for production volumes.

Q: Are the operating temperature ranges identical?

A: Yes. Both parts operate across the identical temperature range of -40°C to 125°C, ensuring consistent performance across all environmental conditions.

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