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HFA1112IBZ Equivalent & Substitute Parts
Part Overview
The HFA1112IBZ 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 2400 V/µs and -3dB bandwidth of 850 MHz, designed for high-speed signal conditioning applications. The HFA1112IBZ is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing design support and production continuity. Substitute parts must maintain compatibility with the 8-SOIC package format and operate within the specified supply voltage range of 9 V to 11 V.
Substiute Parts
Key Parameters
| Parameter | HFA1112IBZ Value | Unit |
|---|---|---|
| Amplifier Type | Buffer | — |
| Number of Circuits | 1 | — |
| Slew Rate | 2400 | V/µs |
| -3dB Bandwidth | 850 | MHz |
| Current - Input Bias | 25 | 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 | 3 (168 Hours) | — |
Substitute Part Grouping Explanation
Substitute components for the HFA1112IBZ are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Package Compatibility: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90 mm) width to ensure direct board-level replacement without layout modifications.
Supply Voltage Range: Substitute parts must operate within or encompass the HFA1112IBZ supply voltage range of 9 V to 11 V. Parts with wider supply ranges (such as 6 V to 12 V) are acceptable as they include the required operating window.
Operating Temperature Range: All substitutes must support the -40°C to 85°C operating temperature specification.
Single Circuit Configuration: Only single-circuit amplifier devices are considered as substitutes, maintaining the 1-circuit topology of the original part.
Amplifier Topology: While the HFA1112IBZ is a buffer amplifier, voltage feedback amplifiers from Analog Devices and Texas Instruments are listed as functional substitutes due to their ability to perform equivalent signal conditioning and buffering functions in the specified frequency and slew rate range.
The substitute parts are grouped into two categories: Analog Devices AD963x series (voltage feedback amplifiers with active product status) and Texas Instruments OPA656/OPA657 series (voltage feedback amplifiers with last-time-buy or active status).
Parameter Comparison
| Parameter | HFA1112IBZ | AD9631ARZ | AD9631ARZ-REEL | AD9631ARZ-REEL7 | AD9632ARZ | AD9632ARZ-REEL7 | OPA656U | OPA656U/2K5 | OPA656UB | OPA656UB/2K5 | OPA657U |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Amplifier Type | Buffer | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 2400 | 1300 | 1300 | 1300 | 1500 | 1500 | 295 | 295 | 295 | 295 | 700 |
| -3dB Bandwidth (MHz) | 850 | 320 | 320 | 320 | 250 | 250 | 500 | 500 | 500 | 500 | 350 |
| Current - Input Bias (µA) | 25 | 2 | 2 | 2 | 2 | 2 | 0.002 | 0.002 | 0.001 | 0.001 | 0.002 |
| Voltage - Input Offset (mV) | 8 | 3 | 3 | 3 | 2 | 2 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
| Current - Supply (mA) | 21 | 17 | 17 | 17 | 16 | 16 | 14 | 14 | 14 | 14 | 14 |
| Current - Output / Channel (mA) | 60 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 |
| Voltage - Supply Span Min (V) | 9 | 6 | 6 | 6 | 6 | 6 | 8 | 8 | 8 | 8 | 8 |
| Voltage - Supply Span Max (V) | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not Specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | Not Specified | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Last Time Buy | Active | Last Time Buy | Active | Active |
Engineering Selection Recommendations
Primary Substitutes (Recommended for New Designs):
The AD9631ARZ-REEL7 and AD9632ARZ-REEL7 are the preferred substitutes for the HFA1112IBZ. Both parts are manufactured by Analog Devices Inc., carry active product status, and are available in high inventory quantities (18,321 and 17,070 units respectively). These devices are ROHS3 compliant with superior moisture sensitivity ratings (MSL 1, Unlimited) compared to the original part. The AD9632ARZ-REEL7 offers slightly improved performance with a 1500 V/µs slew rate and lower input offset voltage (2 mV) while maintaining the required operating temperature range and 8-SOIC package format.
Secondary Substitutes (For Existing Inventory Management):
The OPA656U/2K5 and OPA657U from Texas Instruments provide alternative substitution paths. The OPA656U/2K5 maintains active product status with 65,980 units in stock, offering the lowest supply current (14 mA) among all substitutes. The OPA657U delivers superior slew rate performance (700 V/µs) and higher bandwidth (350 MHz) with active product status and 1,301 units available. Both OPA parts maintain ROHS3 compliance and the required 8-SOIC package.
Compliance Considerations:
All recommended substitutes meet ROHS3 compliance requirements and operate within the -40°C to 85°C temperature specification. The Analog Devices AD963x series offers improved moisture sensitivity characteristics (MSL 1 versus MSL 3), reducing handling and storage risks. All substitute parts are classified as EAR99 and REACH Unaffected, maintaining regulatory alignment with the original HFA1112IBZ.
Supply Voltage Compatibility:
While the HFA1112IBZ requires 9 V to 11 V supply operation, all substitute parts operate across wider supply ranges (6 V to 12 V or 8 V to 12 V). This expanded range ensures compatibility with the original specification while providing design flexibility for future applications.
Frequently Asked Questions (FAQ)
Q: Can the AD9631ARZ-REEL7 directly replace the HFA1112IBZ in existing designs?
A: The AD9631ARZ-REEL7 is mechanically and electrically compatible with the HFA1112IBZ. Both devices use the 8-SOIC package and operate within the required -40°C to 85°C temperature range. The supply voltage range of the AD9631ARZ-REEL7 (6 V to 12 V) encompasses the HFA1112IBZ requirement (9 V to 11 V). However, the AD9631ARZ-REEL7 is a voltage feedback amplifier rather than a buffer amplifier, so circuit-level validation is necessary to confirm functional equivalence in the specific application.
Q: What is the difference between AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7?
A: These three part numbers represent the same die and electrical specifications but differ in packaging format. AD9631ARZ is supplied in Tube packaging, AD9631ARZ-REEL is supplied in Tape & Reel (TR) format, and AD9631ARZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. All three variants are electrically identical with identical electrical parameters and product status. Selection depends on assembly process requirements and inventory management preferences.
Q: Why do the OPA656 and OPA657 parts have lower slew rates than the HFA1112IBZ?
A: The OPA656 series (295 V/µs) and OPA657 (700 V/µs) are optimized for different performance characteristics than the HFA1112IBZ (2400 V/µs). The OPA656 prioritizes ultra-low input bias current (1-2 pA) and extremely low input offset voltage (250 µV), making it suitable for precision signal conditioning. The OPA657 offers a middle ground with 700 V/µs slew rate and 1.6 GHz gain-bandwidth product. Selection between these parts depends on whether slew rate or input precision is the critical design parameter.
Q: Are all substitute parts ROHS3 compliant?
A: All substitute parts listed are ROHS3 compliant except OPA656U/2K5, which does not specify RoHS status in the provided data. The Analog Devices AD963x series and most Texas Instruments OPA parts explicitly state ROHS3 compliance. Verify RoHS compliance documentation with the component supplier for OPA656U/2K5 if regulatory compliance is a design requirement.
Q: What is the moisture sensitivity difference between the HFA1112IBZ and substitute parts?
A: The HFA1112IBZ has MSL 3 (168 Hours), indicating it requires reflow within 168 hours of moisture exposure. The Analog Devices AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7, AD9632ARZ, and AD9632ARZ-REEL7 all have MSL 1 (Unlimited), meaning they can be stored indefinitely without moisture baking requirements. The Texas Instruments OPA656 and OPA657 series maintain MSL 3 (168 Hours) equivalent to the original part. For high-volume production with extended storage periods, the AD963x series offers superior moisture handling characteristics.
Q: Can I use OPA657U instead of OPA656U for higher performance?
A: The OPA657U offers superior performance with 700 V/µs slew rate and 1.6 GHz gain-bandwidth product compared to OPA656U (295 V/µs, 230 MHz gain-bandwidth product). Both parts maintain identical supply current (14 mA), output current (70 mA), and operating temperature range. The OPA657U is suitable for applications requiring higher bandwidth and faster transient response. However, circuit-level design validation is required to confirm that the different amplifier characteristics do not introduce stability or performance issues in the specific application.
Q: What inventory quantities are available for each substitute part?
A: AD9631ARZ-REEL7 has the highest inventory at 18,321 units. AD9632ARZ-REEL7 has 17,070 units. OPA656U/2K5 has 65,980 units. AD9631ARZ has 4,977 units. OPA657U has 1,301 units. OPA656U has 3,565 units. OPA656UB/2K5 has 3,200 units. AD9632ARZ has 3,203 units. OPA656UB has 1,866 units. AD9631ARZ-REEL has 2,801 units. Inventory levels should be confirmed with the component supplier for current availability.
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