AD812AR Equivalent & Substitute Parts

Part Overview

The AD812AR is a dual-channel current feedback amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This linear amplifier is designed for video and high-speed signal processing applications requiring current feedback topology. The AD812AR is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Current feedback amplifiers offer superior bandwidth and slew rate performance compared to conventional voltage feedback topologies, making them suitable for applications demanding fast transient response and wide bandwidth operation.

Substiute Parts

AD812AR

Analog Devices Inc.In Stock: 4789AD812AR Datasheet

Current PartRFQ

AD812ARZ

Analog Devices Inc.In Stock: 12772AD812ARZ Datasheet

DirectRFQ

THS3062D

Texas InstrumentsIn Stock: 3943THS3062D Datasheet

SimilarRFQ

THS3092D

Texas InstrumentsIn Stock: 3204THS3092D Datasheet

SimilarRFQ

THS3122CD

Texas InstrumentsIn Stock: 2292THS3122CD Datasheet

SimilarRFQ

THS3122CDR

Texas InstrumentsIn Stock: 1127THS3122CDR Datasheet

SimilarRFQ

THS3122ID

Texas InstrumentsIn Stock: 1125THS3122ID Datasheet

SimilarRFQ

TL072CDT

STMicroelectronicsIn Stock: 203221TL072CDT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AD812AR is determined by the following critical parameters:

Primary Substitution Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Number of Circuits: 2
• Amplifier Type: Current Feedback
• Voltage Supply Compatibility: Minimum 10V span for most alternatives

Substitution Categories:

Direct Equivalent (Same Manufacturer): The AD812ARZ is the active production equivalent from Analog Devices Inc., sharing identical electrical specifications and packaging. This part differs only in packaging format (Tube vs. unspecified for AD812AR) and product status (Active vs. Obsolete).

Functional Equivalents (Current Feedback Topology): The THS3122 series (THS3122CD, THS3122CDR, THS3122ID) and THS3062D from Texas Instruments provide current feedback amplification in the same 8-SOIC package. These parts maintain the dual-circuit configuration and surface mount format while offering comparable or enhanced electrical performance.

Performance-Enhanced Alternatives: The THS3092D provides higher slew rate (5700 V/µs) and output current capability (280 mA per channel) while maintaining the 8-SOIC package and dual-circuit configuration.

Architectural Alternative: The TL072CDT represents a different amplifier topology (J-FET vs. current feedback) in the same package. This part is included as a substitute option but operates under fundamentally different electrical principles and should be evaluated for application compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: AD812ARZ

The AD812ARZ is the direct active equivalent from Analog Devices Inc. This part maintains identical electrical specifications to the AD812AR while offering active product status and ROHS3 compliance. The AD812ARZ is suitable for direct replacement in all applications where the AD812AR was originally specified. Inventory availability is significantly higher (12,708 units) compared to the obsolete AD812AR (4,778 units).

Secondary Recommendation: THS3122ID

The THS3122ID from Texas Instruments provides current feedback amplification with specifications closely aligned to the AD812AR. Operating temperature range extends to -40°C ~ 85°C, supporting broader environmental applications. This part is ROHS3 compliant and REACH unaffected. The THS3122ID maintains the 8-SOIC package and dual-circuit configuration with comparable slew rate (1550 V/µs) and bandwidth (160 MHz) performance.

Alternative Recommendation: THS3092D

The THS3092D offers enhanced performance characteristics including higher slew rate (5700 V/µs) and significantly increased output current capability (280 mA per channel). This part is suitable for applications requiring improved transient response and higher load driving capability. ROHS3 compliance and REACH unaffected status are confirmed.

Conditional Recommendation: TL072CDT

The TL072CDT operates under J-FET amplifier topology rather than current feedback architecture. This part is included as a substitute option only for applications where the specific current feedback characteristics of the AD812AR are not critical. The TL072CDT offers lower power consumption (1.4 mA) and extended supply voltage range (6V ~ 36V). AEC-Q100 automotive qualification is available. Bandwidth and slew rate performance are substantially lower than the AD812AR, requiring application-specific evaluation.

Not Recommended: THS3122CDR

The THS3122CDR is discontinued at DiGi Electronics and should not be selected for new designs despite active electrical specifications. Procurement risk and long-term availability concerns make this part unsuitable for production applications.

Frequently Asked Questions (FAQ)

Q: Can the AD812ARZ be used as a direct replacement for the AD812AR?

A: Yes. The AD812ARZ is the active production equivalent from Analog Devices Inc., sharing identical electrical specifications including bandwidth (145 MHz), slew rate (1600 V/µs), supply current (4.5 mA), and output current (50 mA per channel). Both parts are housed in the 8-SOIC package with identical pinout and functional characteristics. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube vs. unspecified).

Q: What are the key differences between the AD812AR and Texas Instruments current feedback alternatives?

A: The THS3122 series (THS3122CD, THS3122ID) and THS3062D maintain the 8-SOIC package and dual-circuit current feedback topology. The THS3122 series operates with 1550 V/µs slew rate and 160 MHz bandwidth, closely matching the AD812AR specifications. The THS3062D provides enhanced performance with 300 MHz bandwidth and 7000 V/µs slew rate. All Texas Instruments alternatives require minimum 10V supply span, whereas the AD812AR operates from 2.4V single supply. Output current capability varies significantly: AD812AR provides 50 mA per channel, while THS3122 series provides 440 mA per channel.

Q: Is the TL072CDT a suitable substitute for the AD812AR?

A: The TL072CDT operates under J-FET amplifier topology, fundamentally different from the current feedback architecture of the AD812AR. While both parts are housed in the 8-SOIC package with dual-circuit configuration, the TL072CDT exhibits substantially lower bandwidth (4 MHz vs. 145 MHz) and slew rate (16 V/µs vs. 1600 V/µs). The TL072CDT is suitable only for applications where current feedback performance is not required and lower bandwidth operation is acceptable.

Q: What compliance certifications should be verified when selecting a substitute?

A: All active substitute parts listed (AD812ARZ, THS3062D, THS3092D, THS3122CD, THS3122ID, TL072CDT) are ROHS3 compliant and REACH unaffected. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no moisture sensitivity constraints. The TL072CDT carries AEC-Q100 automotive qualification. Verify compliance requirements specific to your application before final part selection.

Q: Are there supply voltage compatibility concerns when substituting parts?

A: Yes. The AD812AR operates from 2.4V ~ 36V single supply or ±1.2V ~ 18V dual supply. Most Texas Instruments alternatives (THS3062D, THS3092D, THS3122 series) require minimum 10V supply span, limiting operation at lower voltages. The TL072CDT operates from 6V ~ 36V. Verify your application's supply voltage requirements against the selected substitute part's minimum and maximum supply specifications.

Q: What is the inventory status of available substitutes?

A: The AD812ARZ (active equivalent) has the highest inventory availability at 12,708 units. The TL072CDT has substantial inventory (203,200 units). Texas Instruments alternatives show moderate availability: THS3062D (3,900 units), THS3092D (3,100 units), THS3122CD (2,280 units), THS3122ID (1,022 units). The THS3122CDR is discontinued at DiGi Electronics with only 1,106 units remaining.

Q: Can multiple substitute parts be used interchangeably in the same application?

A: No. While all substitute parts share the 8-SOIC package and dual-circuit configuration, electrical specifications vary significantly. Slew rate ranges from 16 V/µs (TL072CDT) to 7000 V/µs (THS3062D). Output current capability ranges from 40 mA (TL072CDT) to 440 mA (THS3122 series). Supply voltage requirements differ substantially. Each substitute part must be evaluated individually for application compatibility based on bandwidth, slew rate, output current, and supply voltage requirements.