HFA1110IBZ Equivalent & Substitute Parts

Part Overview

The HFA1110IBZ is a buffer amplifier integrated circuit manufactured by Renesas Electronics Corporation, housed in an 8-SOIC surface mount package. This device functions as a single-circuit buffer amplifier with a slew rate of 1300V/µs and -3dB bandwidth of 750 MHz, designed for high-speed signal conditioning applications. The HFA1110IBZ is classified as obsolete, making equivalent and substitute parts necessary for new designs, production continuity, and long-term system support.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Buffer	—
Number of Circuits	1	—
Slew Rate	1300	V/µs
-3dB Bandwidth	750	MHz
Current - Input Bias	10	µA
Voltage - Input Offset	8	mV
Current - Supply	21	mA
Current - Output / Channel	60	mA
Voltage - Supply Span (Min)	9	V
Voltage - Supply Span (Max)	11	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the HFA1110IBZ is determined by compatibility across the following critical parameters: package type (8-SOIC surface mount), operating temperature range (-40°C to 85°C), supply voltage compatibility, slew rate performance, bandwidth characteristics, and output current capability. All substitute parts listed maintain the 8-SOIC package format and surface mount technology, ensuring mechanical and electrical compatibility with existing PCB layouts.

The substitute parts are grouped into two functional categories:

Category 1: Voltage Feedback Amplifiers — Parts including AD8048ARZ-REEL7, LMH6551MAX/NOPB, LT1722CS8#PBF, MAX452CSA+, and OPA656U operate as voltage feedback amplifiers with varying bandwidth and slew rate characteristics. These devices provide alternative topologies while maintaining single-circuit configurations and 8-SOIC packaging.

Category 2: Specialized Amplifier Types — Parts including THS4503ID (differential amplifier) and VCA810AID (variable gain amplifier) offer alternative amplifier architectures. These devices maintain the 8-SOIC package and single-circuit design but introduce different functional capabilities suited to specific application requirements.

Substitution logic is based strictly on: package compatibility (8-SOIC), mounting type (surface mount), operating temperature range overlap, supply voltage range compatibility, and output current capability (minimum 50 mA across all substitutes).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	-3dB Bandwidth (MHz)	Current - Supply (mA)	Current - Output / Channel (mA)	Voltage - Supply Span Min (V)	Voltage - Supply Span Max (V)	Operating Temperature (°C)	Product Status	Package
HFA1110IBZ	Renesas Electronics	Buffer	1300	750	21	60	9	11	-40 to 85	Obsolete	8-SOIC
AD8048ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	1000	260	5.9	50	6	12	-40 to 85	Active	8-SOIC
LMH6551MAX/NOPB	Texas Instruments	Voltage Feedback	2400	370	12.5	65	3	12	-40 to 125	Active	8-SOIC
LT1722CS8#PBF	Analog Devices Inc.	Voltage Feedback	70	200	3.7	—	5	10	0 to 70	Active	8-SOIC
MAX452CSA+	Analog Devices Inc./Maxim Integrated	Voltage Feedback	300	50	25	20	±4.5	±5.5	—	Obsolete	8-SOIC
OPA656U	Texas Instruments	Voltage Feedback	295	500	14	70	8	12	-40 to 85	Last Time Buy	8-SOIC
THS4503ID	Texas Instruments	Differential	2800	370	23	120	4.5	15	-40 to 85	Active	8-SOIC
VCA810AID	Texas Instruments	Variable Gain	350	35	20	60	8	12	-40 to 85	Active	8-SOIC

Engineering Selection Recommendations

For Direct Functional Replacement:

The AD8048ARZ-REEL7 and OPA656U provide the closest functional alignment to the HFA1110IBZ within the voltage feedback amplifier category. Both devices maintain the -40°C to 85°C operating temperature range, support 8-SOIC packaging, and deliver output current capabilities (50 mA and 70 mA respectively) compatible with the original 60 mA specification. AD8048ARZ-REEL7 is classified as Active product status with unlimited moisture sensitivity, ensuring long-term availability and supply chain stability. OPA656U is classified as Last Time Buy, indicating limited future availability.

For Enhanced Performance Applications:

The LMH6551MAX/NOPB offers superior slew rate (2400V/µs) and extended operating temperature range (-40°C to 125°C), with active product status. This device accommodates wider supply voltage ranges (3V to 12V) and delivers higher output current (65 mA), making it suitable for applications requiring enhanced thermal performance or extended operating conditions.

For Low-Power Designs:

The LT1722CS8#PBF provides the lowest supply current (3.7 mA) among active substitutes, suitable for power-constrained applications. However, this device operates within a narrower temperature range (0°C to 70°C) and exhibits reduced slew rate (70V/µs), requiring application-specific evaluation.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original HFA1110IBZ certifications. Moisture sensitivity levels vary; AD8048ARZ-REEL7 and LMH6551MAX/NOPB offer unlimited MSL ratings, providing superior handling flexibility compared to the original device's MSL 3 specification.

Obsolete Part Alternatives:

MAX452CSA+ and OPA656U are classified as obsolete and Last Time Buy respectively. These parts should not be selected for new designs requiring long-term production support. They are listed for reference only in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q: Can the AD8048ARZ-REEL7 directly replace the HFA1110IBZ in existing designs?

A: The AD8048ARZ-REEL7 maintains mechanical compatibility (8-SOIC package, surface mount) and operates within the same temperature range (-40°C to 85°C). However, the slew rate is reduced from 1300V/µs to 1000V/µs, and -3dB bandwidth decreases from 750 MHz to 260 MHz. Circuit-level evaluation is required to confirm functional compatibility with specific application requirements.

Q: What is the primary advantage of LMH6551MAX/NOPB over other substitutes?

A: The LMH6551MAX/NOPB provides the highest slew rate (2400V/µs) among all listed substitutes and extends the maximum operating temperature to 125°C. It also offers the widest supply voltage range (3V to 12V minimum to maximum). These characteristics make it suitable for high-speed, high-temperature applications. The device is classified as active product status, ensuring continued availability.

Q: Why is the operating temperature range important for substitution?

A: The operating temperature range defines the thermal envelope within which the device maintains specified electrical performance. The HFA1110IBZ operates from -40°C to 85°C. Substitutes with narrower ranges (such as LT1722CS8#PBF at 0°C to 70°C) may not function reliably in applications requiring full -40°C to 85°C coverage. Substitutes with extended ranges (such as LMH6551MAX/NOPB at -40°C to 125°C) provide additional thermal margin.

Q: What does "Last Time Buy" product status mean for OPA656U?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this device. Existing inventory may be available, but no future production is planned. OPA656U should not be selected for new designs requiring long-term production support. It is suitable only for legacy system maintenance or short-term production runs with confirmed inventory availability.

Q: Are there functional differences between buffer amplifiers and voltage feedback amplifiers?

A: Yes. The HFA1110IBZ is classified as a buffer amplifier, while most substitutes (AD8048ARZ-REEL7, LMH6551MAX/NOPB, OPA656U) are voltage feedback amplifiers. Buffer amplifiers are optimized for impedance transformation and signal isolation, while voltage feedback amplifiers provide gain and filtering capabilities. Application-specific circuit design is required to confirm functional equivalence.

Q: How do supply voltage ranges affect substitution decisions?

A: The HFA1110IBZ operates within a narrow supply range (9V to 11V). Substitutes with wider ranges (such as AD8048ARZ-REEL7 at 6V to 12V or LMH6551MAX/NOPB at 3V to 12V) provide greater design flexibility and may accommodate different power supply architectures. Conversely, narrower ranges may impose additional power supply regulation requirements.

Q: What is the significance of output current ratings in substitution?

A: Output current capability determines the maximum load current the amplifier can drive. The HFA1110IBZ provides 60 mA per channel. Substitutes with lower ratings (MAX452CSA+ at 20 mA) may not support the same load impedances, while substitutes with higher ratings (THS4503ID at 120 mA) provide additional drive capability. Application load analysis is required to confirm compatibility.

Q: Why is moisture sensitivity level (MSL) relevant for component selection?

A: MSL defines the maximum time a component can be exposed to ambient humidity before soldering without baking. The HFA1110IBZ has MSL 3 (168 hours), while active substitutes AD8048ARZ-REEL7 and LMH6551MAX/NOPB have unlimited MSL. Unlimited MSL provides superior handling flexibility and reduces manufacturing process constraints, particularly for extended storage or high-humidity environments.

Q: Can THS4503ID or VCA810AID be used as direct substitutes?

A: THS4503ID (differential amplifier) and VCA810AID (variable gain amplifier) offer different functional architectures than the buffer amplifier HFA1110IBZ. While they maintain 8-SOIC packaging and compatible operating temperatures, their circuit topologies and performance characteristics differ significantly. These devices are suitable only for applications where their specific functional capabilities (differential output or variable gain control) are required.

Q: What compliance certifications should be verified during substitution?

A: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original HFA1110IBZ. These certifications confirm environmental compliance and hazardous substance restrictions. No additional compliance verification is required beyond confirming these standard certifications are present on the substitute device datasheet.

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