AD641APZ Equivalent & Substitute Parts

Part Overview

The AD641APZ is a logarithmic amplifier integrated circuit manufactured by Analog Devices Inc., designed for precision logarithmic signal processing applications. This device features a single logarithmic circuit in a 20-PLCC surface mount package with a -3dB bandwidth of 250 MHz. The AD641APZ is classified as an obsolete product, indicating it is no longer in active production. For applications requiring continued component availability or alternative mounting configurations, equivalent substitute parts are available within the AD641 product family.

Substiute Parts

AD641APZ

Analog Devices Inc.In Stock: 1275AD641APZ Datasheet

Current PartRFQ

AD641ANZ

Analog Devices Inc.In Stock: 1189AD641ANZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution within the AD641 product family is determined by electrical parameter equivalence and functional compatibility. The primary substitution criterion is that all electrical characteristics—including amplifier type, circuit count, bandwidth, bias current, input offset voltage, supply current, output current, supply voltage range, and operating temperature range—must remain identical across substitute parts.

The AD641APZ and AD641ANZ share identical electrical specifications and functional performance. The distinction between these parts lies exclusively in their physical packaging and mounting technology:

Key Parameters Determining Substitution:

• Amplifier Type: Logarithmic
• Number of Circuits: 1
• -3dB Bandwidth: 250 MHz
• Current - Input Bias: 7 µA
• Voltage - Input Offset: 50 µV
• Current - Supply: 35 mA
• Current - Output / Channel: 2.3 mA
• Voltage - Supply Span: 9 V to 15 V
• Operating Temperature: -40°C to 85°C

Parameter Comparison

Engineering Selection Recommendations

The AD641ANZ serves as the primary substitute for the AD641APZ. Both devices are manufactured by Analog Devices Inc. and share identical electrical performance specifications across all measured parameters. The AD641ANZ is classified as an active product, ensuring continued availability and supply chain reliability compared to the obsolete AD641APZ.

Selection between these parts is determined by circuit board design requirements:

AD641APZ (20-PLCC Surface Mount): Suitable for applications utilizing surface mount assembly processes and printed circuit board designs with surface mount footprints.

AD641ANZ (20-DIP Through Hole): Suitable for applications utilizing through-hole assembly processes and printed circuit board designs with DIP footprints.

The AD641ANZ carries RoHS3 compliance and REACH unaffected status, providing regulatory alignment for applications subject to these requirements. Both parts maintain MSL Level 1 (Unlimited) moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Are the AD641APZ and AD641ANZ electrically equivalent?

A: Yes. Both devices are logarithmic amplifiers with identical electrical specifications, including -3dB bandwidth of 250 MHz, input bias current of 7 µA, input offset voltage of 50 µV, supply current of 35 mA, output current of 2.3 mA, and operating temperature range of -40°C to 85°C.

Q: What is the primary difference between these substitute parts?

A: The primary difference is packaging and mounting technology. The AD641APZ uses a 20-PLCC surface mount package, while the AD641ANZ uses a 20-DIP through-hole package. The electrical performance and functional behavior are identical.

Q: Can I use the AD641ANZ as a direct replacement for the AD641APZ on an existing circuit board?

A: Direct board-level replacement is not possible without circuit board redesign. The AD641APZ requires a surface mount footprint (20-PLCC), while the AD641ANZ requires a through-hole footprint (20-DIP). PCB layout and assembly process modifications are necessary.

Q: Why is the AD641APZ listed as obsolete?

A: The AD641APZ is no longer in active production by Analog Devices Inc. The AD641ANZ remains in active production and is the recommended alternative for new designs and component replenishment.

Q: Are there any compliance differences between the two parts?

A: The AD641ANZ carries RoHS3 compliance and REACH unaffected status. Both parts maintain MSL Level 1 (Unlimited) moisture sensitivity classification. Compliance requirements should be evaluated against specific application and regulatory standards.

Q: What supply voltage range do these devices support?

A: Both the AD641APZ and AD641ANZ operate with a supply voltage span of 9 V to 15 V.

Q: Are these parts suitable for high-frequency applications?

A: Both devices feature a -3dB bandwidth of 250 MHz, supporting applications requiring this bandwidth specification.