ADA4870ARRZ Equivalent & Substitute Parts

Part Overview

The ADA4870ARRZ is a Current Feedback Amplifier (CFA) manufactured by Analog Devices Inc., configured as a single-circuit operational amplifier in a 20-PowerSOIC package with exposed pad. This device is classified as obsolete, indicating that the original packaging configuration is no longer in active production. The ADA4870ARRZ delivers high-speed amplification with a slew rate of 2500V/µs and -3dB bandwidth of 60 MHz, suitable for applications requiring fast transient response and wide bandwidth performance.

Due to its obsolete status, locating replacement units from standard distribution channels becomes increasingly difficult. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for ongoing production and maintenance requirements.

Substiute Parts

ADA4870ARRZ

Analog Devices Inc.In Stock: 1452ADA4870ARRZ Datasheet

Current PartRFQ

ADA4870ACPZ

Analog Devices Inc.In Stock: 977ADA4870ACPZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADA4870ARRZ is determined by functional equivalence across the following critical parameters:

Functional Equivalence Criteria:

• Amplifier Type: Current Feedback architecture
• Number of Circuits: Single-circuit configuration
• Slew Rate: 2500V/µs (identical performance)
• Voltage Supply Range: 10V to 40V (identical operating envelope)
• Input Offset Voltage: 1 mV (identical specification)
• Supply Current: 32.5 mA (identical current draw)
• Operating Temperature: -40°C to 85°C (identical range)
• Mounting Type: Surface Mount
• Compliance: ROHS3 and REACH standards

The ADA4870ACPZ qualifies as a manufacturer-recommended substitute based on identical core electrical performance parameters and compliance certifications. Differences in package type (48-LFCSP versus 20-PowerSOIC) and minor variations in secondary parameters (-3dB bandwidth and input bias current) do not preclude functional substitution when circuit board layout and thermal management accommodate the alternative package geometry.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The ADA4870ARRZ is classified as obsolete, while the ADA4870ACPZ maintains active production status. This distinction is significant for long-term supply chain planning and component availability.

Compliance and Certification: Both parts maintain identical compliance certifications: ROHS3 compliance and REACH unaffected status. Both devices carry identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications, ensuring regulatory equivalence for export and procurement purposes.

Electrical Performance: Core electrical parameters remain identical across both devices: slew rate (2500V/µs), supply voltage range (10V to 40V), input offset voltage (1 mV), and supply current (32.5 mA). The ADA4870ACPZ exhibits a -3dB bandwidth of 52 MHz compared to 60 MHz for the ADA4870ARRZ, and input bias current of 12 µA versus 9 µA. These variations fall within acceptable tolerance ranges for current feedback amplifier applications and do not constitute functional incompatibility.

Package Transition: The primary distinction between these parts is packaging: the ADA4870ARRZ uses a 20-PowerSOIC configuration, while the ADA4870ACPZ employs a 48-LFCSP (7x7) package. Circuit board redesign and thermal management evaluation are required when transitioning between these package types.

Frequently Asked Questions (FAQ)

Q: Can the ADA4870ACPZ directly replace the ADA4870ARRZ without circuit board modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (20-PowerSOIC versus 48-LFCSP). Circuit board layout redesign is required. However, the electrical functionality and performance characteristics are equivalent, supporting functional substitution with appropriate PCB redesign.

Q: What are the key differences between these two parts?

A: The primary differences are package type and minor secondary parameters. The ADA4870ACPZ offers -3dB bandwidth of 52 MHz (versus 60 MHz) and input bias current of 12 µA (versus 9 µA). Both parts share identical slew rate, supply voltage range, input offset voltage, and supply current specifications. The ADA4870ACPZ maintains active production status, whereas the ADA4870ARRZ is obsolete.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts maintain identical compliance certifications: ROHS3 compliance, REACH unaffected status, EAR99 ECCN classification, and HTSUS code 8542.33.0001. Regulatory and export requirements are equivalent.

Q: What is the impact of the bandwidth difference (60 MHz versus 52 MHz)?

A: The ADA4870ARRZ provides 8 MHz additional bandwidth. For applications requiring the full 60 MHz bandwidth specification, the ADA4870ACPZ may not satisfy performance requirements. For applications operating below 52 MHz, the ADA4870ACPZ provides equivalent performance.

Q: What is the significance of the input bias current difference (9 µA versus 12 µA)?

A: The 3 µA difference represents a 33% increase in input bias current for the ADA4870ACPZ. In high-impedance input circuits, this variation may affect DC operating point and offset voltage performance. Circuit analysis is required to determine acceptability for specific applications.

Q: Why is the ADA4870ARRZ classified as obsolete?

A: Obsolete classification indicates that the manufacturer has discontinued production of this specific part number and package configuration. The ADA4870ACPZ represents the active production alternative from Analog Devices Inc.

Q: What thermal considerations apply to the package transition?

A: The 48-LFCSP package has different thermal characteristics than the 20-PowerSOIC package. Thermal analysis and potentially modified heatsinking or board layout may be required to maintain equivalent thermal performance in the application.

Q: Are both parts available from the same suppliers?

A: The ADA4870ACPZ maintains active inventory status (882 pieces noted as in stock), while the ADA4870ARRZ is obsolete. Availability of the ADA4870ARRZ through distribution channels is limited and declining.