HFA1145IBZ Equivalent & Substitute Parts

Part Overview

The HFA1145IBZ is a current feedback video amplifier manufactured by Renesas Electronics Corporation, housed in an 8-SOIC surface mount package. This linear amplifier is designed for high-speed current feedback applications with a -3dB bandwidth of 330 MHz and a slew rate of 2100V/µs. The device operates on dual supply voltages (±4.5V to ±5.5V or 9V to 11V single supply) and delivers 60 mA output current per channel.

The HFA1145IBZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems utilizing this amplifier topology.

Substiute Parts

HFA1145IBZ

Renesas Electronics CorporationIn Stock: 3258HFA1145IBZ Datasheet

Current PartRFQ

ADA4857-1YRZ

Analog Devices Inc.In Stock: 50304ADA4857-1YRZ Datasheet

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LMH6505MA/NOPB

Texas InstrumentsIn Stock: 1545LMH6505MA/NOPB Datasheet

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LMH6720MA/NOPB

Texas InstrumentsIn Stock: 3363LMH6720MA/NOPB Datasheet

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MAX4430ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 965MAX4430ESA+T Datasheet

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OPA656UB

Texas InstrumentsIn Stock: 1935OPA656UB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HFA1145IBZ is determined by the following critical parameters:

Topology & Application Match: The HFA1145IBZ is a current feedback amplifier optimized for video and high-speed applications. Substitute parts must support current feedback topology or demonstrate equivalent performance characteristics in the same application domain.

Electrical Performance Envelope: Substitute parts must operate within the specified supply voltage range (9V to 11V single supply or ±4.5V to ±5.5V dual supply) and deliver sufficient output current (60 mA minimum per channel). Bandwidth and slew rate performance must be compatible with the original design specifications.

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Compliance & Regulatory Status: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to satisfy regulatory requirements equivalent to the original device.

Product Status Consideration: While the HFA1145IBZ is obsolete, substitute parts with active product status provide long-term supply chain assurance and continued manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

LMH6720MA/NOPB (Primary Substitute)

The LMH6720MA/NOPB from Texas Instruments is the closest functional equivalent to the HFA1145IBZ. Both devices employ current feedback topology optimized for video amplifier applications. The LMH6720MA/NOPB operates within compatible supply voltage ranges (±4V to ±6.25V or 8V to 12.5V single supply) and delivers 70 mA output current per channel, exceeding the original 60 mA specification. The -3dB bandwidth of 400 MHz and slew rate of 2100V/µs provide performance characteristics aligned with the HFA1145IBZ. The device carries active product status, ensuring ongoing availability and manufacturer support. Moisture sensitivity level is improved to MSL 1 (Unlimited), reducing handling and storage constraints. All regulatory compliance requirements (ROHS3, REACH Unaffected) are maintained.

ADA4857-1YRZ (Secondary Substitute)

The ADA4857-1YRZ from Analog Devices Inc. is a voltage feedback amplifier with active product status and superior bandwidth performance (850 MHz). While the amplifier topology differs from the current feedback design of the HFA1145IBZ, this device operates within the supply voltage envelope (4.5V to 10.5V) and delivers 50 mA output current per channel. The slew rate of 2800V/µs exceeds the original specification. This substitute is suitable for applications where voltage feedback topology is acceptable and higher bandwidth performance is beneficial. Moisture sensitivity level is improved to MSL 1 (Unlimited).

OPA656UB (Tertiary Substitute)

The OPA656UB from Texas Instruments is a voltage feedback amplifier with -3dB bandwidth of 500 MHz and slew rate of 295V/µs. Supply voltage range (8V to 12V) overlaps with the HFA1145IBZ specification. Output current per channel is 70 mA, exceeding the original requirement. The device carries Last Time Buy status, indicating limited future availability. Moisture sensitivity level matches the original device at MSL 3 (168 Hours). This substitute is applicable for designs where voltage feedback topology is acceptable and extended bandwidth is required.

LMH6505MA/NOPB (Limited Substitution)

The LMH6505MA/NOPB from Texas Instruments is a variable gain amplifier with -3dB bandwidth of 150 MHz, which is below the HFA1145IBZ specification of 330 MHz. Supply voltage range (7V to 12V) partially overlaps with the original device. Output current per channel is 80 mA, exceeding the original specification. This substitute is applicable only for applications where reduced bandwidth is acceptable and variable gain functionality is required.

MAX4430ESA+T (Limited Substitution)

The MAX4430ESA+T from Analog Devices Inc./Maxim Integrated is a voltage feedback amplifier with -3dB bandwidth of 180 MHz and slew rate of 100V/µs, both significantly below the HFA1145IBZ specifications. Supply voltage range (9V to 11V) is narrower than the original device. Output current per channel is 60 mA, matching the original specification. This substitute is applicable only for low-speed applications where the reduced bandwidth and slew rate are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the LMH6720MA/NOPB directly replace the HFA1145IBZ in existing designs?

A: The LMH6720MA/NOPB is mechanically and electrically compatible with the HFA1145IBZ. Both devices use the 8-SOIC package and operate within overlapping supply voltage ranges. The LMH6720MA/NOPB maintains current feedback topology and delivers equivalent or superior performance across bandwidth, slew rate, and output current specifications. Direct substitution is supported without PCB layout modifications.

Q: What is the primary difference between current feedback and voltage feedback amplifiers?

A: Current feedback amplifiers, such as the HFA1145IBZ and LMH6720MA/NOPB, are optimized for high-speed, wideband applications with constant gain-bandwidth product independent of closed-loop gain. Voltage feedback amplifiers, such as the ADA4857-1YRZ and OPA656UB, exhibit gain-dependent bandwidth characteristics. Selection between topologies depends on application requirements for gain, bandwidth, and frequency response stability.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements equivalent to the original HFA1145IBZ device.

Q: What is the significance of Moisture Sensitivity Level (MSL)?

A: Moisture Sensitivity Level indicates the maximum time a component can be exposed to ambient conditions (30°C, 60% relative humidity) before soldering. The HFA1145IBZ and OPA656UB carry MSL 3 (168 Hours), requiring controlled storage and handling. Substitute parts with MSL 1 (Unlimited) offer simplified logistics and reduced risk of moisture-induced failures during manufacturing.

Q: Can voltage feedback amplifiers substitute for current feedback amplifiers?

A: Voltage feedback amplifiers can substitute for current feedback amplifiers in applications where the gain-dependent bandwidth characteristics are acceptable. The ADA4857-1YRZ and OPA656UB provide higher absolute bandwidth performance but require circuit design verification to ensure stability and frequency response meet application requirements.

Q: What is the difference between active and obsolete product status?

A: Active product status indicates ongoing manufacturer production, support, and long-term availability. Obsolete status indicates the manufacturer has discontinued production. The HFA1145IBZ is obsolete; all listed substitute parts carry active or Last Time Buy status, ensuring continued supply chain access.

Q: Is the 8-SOIC package identical across all substitute parts?

A: All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring mechanical compatibility with existing PCB layouts. Pin assignments and functional pinout must be verified against individual device datasheets to confirm electrical compatibility.

Q: Which substitute part offers the best long-term supply chain assurance?

A: The LMH6720MA/NOPB and ADA4857-1YRZ carry active product status with no announced discontinuation plans, providing the strongest long-term supply chain assurance. The OPA656UB carries Last Time Buy status, indicating limited future availability.