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AD712KRZ Equivalent & Substitute Parts
Part Overview
The AD712KRZ is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This component is classified as a linear amplifier and maintains Active product status. The AD712KRZ is specified for applications requiring low input bias current, low input offset voltage, and moderate slew rate performance across a wide supply voltage range. Substitute parts are identified based on matching package type, circuit count, mounting technology, and electrical performance parameters within acceptable operational boundaries.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 2 | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Slew Rate | 20 | V/µs |
| -3dB Bandwidth | 4 | MHz |
| Current - Input Bias | 25 | pA |
| Voltage - Input Offset | 300 | µV |
| Current - Supply | 5 | mA |
| Current - Output / Channel | 25 | mA |
| Voltage - Supply Span (Min) | 9 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | 0 to 70 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the AD712KRZ is determined by the following critical parameters:
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.
Circuit Configuration: The dual-channel (2 circuit) requirement is maintained across all substitute options to preserve functional equivalence.
Amplifier Type Classification: Substitutes are grouped into two categories: J-FET input amplifiers (LF253DT, LF353DT) and General Purpose amplifiers (MC33072DR2G, MC34072DR2G, MC34072VDR2G, MC4558CDT, MC4558IDT, NCV33072ADR2G). J-FET substitutes provide superior input bias current performance; General Purpose substitutes offer alternative electrical characteristics within acceptable operational ranges.
Electrical Performance Boundaries: Substitute parts must operate within the supply voltage range of 9V to 36V (minimum requirement) or demonstrate compatibility through overlapping supply specifications. Slew rate, bandwidth, and output current specifications are evaluated for application suitability rather than exact matching.
Product Status and Compliance: All substitute parts maintain Active product status or equivalent qualification. RoHS3 compliance and MSL Level 1 are consistent across all options.
Parameter Comparison
| Parameter | AD712KRZ | LF253DT | LF353DT | LM258DG4 | LM833DT | MC33072DR2G | MC34072DR2G | MC34072VDR2G | MC4558CDT | MC4558IDT | NCV33072ADR2G |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Analog Devices | STMicroelectronics | STMicroelectronics | Texas Instruments | STMicroelectronics | onsemi | onsemi | onsemi | STMicroelectronics | STMicroelectronics | onsemi |
| Amplifier Type | J-FET | J-FET | J-FET | General Purpose | Audio | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 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 |
| Slew Rate (V/µs) | 20 | 16 | 16 | 0.3 | 7 | 13 | 13 | 13 | 2.2 | 2.2 | 13 |
| Gain Bandwidth Product (MHz) | 4 | 4 | 4 | 1.1 | 15 | 4.5 | 4.5 | 4.5 | 5.5 | 5.5 | 4.5 |
| Current - Input Bias (pA/nA) | 25 pA | 20 pA | 20 pA | 20 nA | 300 nA | 100 nA | 100 nA | 100 nA | 50 nA | 50 nA | 100 nA |
| Voltage - Input Offset (µV/mV) | 300 µV | 3 mV | 3 mV | 3 mV | 300 µV | 1 mV | 1 mV | 1 mV | 1 mV | 1 mV | 500 µV |
| Current - Supply (mA) | 5 | 1.4 (x2) | 1.4 (x2) | 0.5 (x2) | 4 | 1.9 (x2) | 1.9 (x2) | 1.9 (x2) | 2.3 | 2.3 | 1.9 (x2) |
| Current - Output / Channel (mA) | 25 | 40 | 40 | 40 | 37 | 30 | 30 | 30 | 20 | 20 | 30 |
| Voltage - Supply Span Min (V) | 9 | 6 | 6 | 3 | 5 | 3 | 3 | 3 | 4 | 4 | 3 |
| Voltage - Supply Span Max (V) | 36 | 36 | 36 | 32 | 30 | 44 | 44 | 44 | 40 | 40 | 44 |
| Operating Temperature (°C) | 0 to 70 | -40 to 105 | 0 to 70 | -25 to 85 | -40 to 105 | -40 to 85 | 0 to 70 | -40 to 125 | 0 to 70 | -40 to 105 | 150 (TJ) |
| Product Status | Active | Active | Active | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
J-FET Input Substitutes (LF253DT, LF353DT): These STMicroelectronics components maintain J-FET input architecture identical to the AD712KRZ, providing superior input bias current performance (20 pA) and comparable bandwidth (4 MHz). LF253DT supports extended operating temperature range (-40°C to 105°C) and lower minimum supply voltage (6V), offering broader application flexibility. LF353DT matches the AD712KRZ operating temperature range (0°C to 70°C) with identical bandwidth and slew rate characteristics (16 V/µs). Both parts are Active status with ROHS3 compliance and MSL Level 1 rating.
General Purpose Substitutes (MC33072DR2G, MC34072DR2G, MC34072VDR2G): These onsemi components provide General Purpose amplifier architecture with slew rate of 13 V/µs and gain bandwidth product of 4.5 MHz. MC34072VDR2G extends operating temperature to -40°C to 125°C, suitable for automotive and industrial applications. All three variants support supply voltage range of 3V to 44V, exceeding the AD712KRZ specification. Input bias current ranges from 100 nA, representing a trade-off against J-FET performance for broader supply compatibility.
General Purpose Substitutes (MC4558CDT, MC4558IDT): STMicroelectronics MC4558 series offers 5.5 MHz gain bandwidth product with 2.2 V/µs slew rate. MC4558IDT provides extended temperature range (-40°C to 105°C) for demanding environments. Supply voltage range of 4V to 40V accommodates the AD712KRZ specification. Input bias current of 50 nA and output current of 20 mA per channel represent performance trade-offs for cost optimization.
Automotive-Grade Substitute (NCV33072ADR2G): onsemi NCV33072ADR2G is AEC-Q100 qualified automotive-grade component with operating temperature to 150°C (TJ). This part maintains General Purpose amplifier classification with 13 V/µs slew rate and 4.5 MHz bandwidth. Input offset voltage of 500 µV and 100 nA input bias current provide balanced performance. Automotive qualification is applicable only for designs requiring AEC-Q100 certification.
Obsolete Component (LM258DG4): Texas Instruments LM258DG4 is classified as Obsolete product status. This General Purpose amplifier exhibits significantly reduced slew rate (0.3 V/µs) and bandwidth (1.1 MHz), making it unsuitable for high-speed applications. Substitution is not recommended for new designs.
Audio Amplifier (LM833DT): STMicroelectronics LM833DT is classified as Audio amplifier with 15 MHz gain bandwidth product and 7 V/µs slew rate. Extended operating temperature range (-40°C to 105°C) and high output current (37 mA per channel) suit audio signal processing applications. Supply voltage maximum of 30V falls below the AD712KRZ 36V specification.
Frequently Asked Questions (FAQ)
Q: Can LF253DT or LF353DT directly replace AD712KRZ in existing designs?
A: Yes, both LF253DT and LF353DT are pin-compatible J-FET input amplifiers in 8-SOIC packages. Mechanical and electrical compatibility is confirmed through identical package dimensions and dual-channel configuration. LF253DT supports wider operating temperature range; LF353DT matches the AD712KRZ temperature specification (0°C to 70°C). Verify supply voltage requirements: both parts operate at minimum 6V, compared to AD712KRZ minimum of 9V.
Q: What is the primary difference between J-FET and General Purpose substitute options?
A: J-FET input amplifiers (LF253DT, LF353DT) provide input bias current in the picoampere range (20 pA), compared to nanoampere range (50-300 nA) for General Purpose types. This distinction is critical for high-impedance signal sources where input bias current leakage affects measurement accuracy. General Purpose substitutes offer broader supply voltage compatibility and lower cost. Selection depends on application requirements for input impedance and bias current performance.
Q: Are all substitute parts RoHS3 compliant and MSL Level 1?
A: Yes, all listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). This ensures compatibility with lead-free soldering processes and eliminates moisture-related handling restrictions during assembly and storage.
Q: Which substitute part supports the widest operating temperature range?
A: MC34072VDR2G supports -40°C to 125°C operating temperature, the broadest range among all substitutes. NCV33072ADR2G extends to 150°C junction temperature with automotive-grade AEC-Q100 qualification. LF253DT provides -40°C to 105°C for non-automotive applications requiring extended temperature performance.
Q: Can General Purpose amplifiers replace J-FET types in precision measurement circuits?
A: General Purpose amplifiers exhibit input bias current in the nanoampere range, approximately 1000 times higher than J-FET types. For precision measurement circuits with high-impedance sources (>1 MΩ), this bias current introduces unacceptable offset errors. J-FET substitutes (LF253DT, LF353DT) are required for such applications. General Purpose types are suitable for buffering, filtering, and signal conditioning where input impedance is moderate.
Q: What is the significance of the 9V minimum supply voltage specification for AD712KRZ?
A: The AD712KRZ requires minimum 9V supply voltage for specified performance. Most substitute parts operate at lower minimum voltages (3V to 6V). If the application circuit supplies exactly 9V, verify that substitute parts maintain performance at this voltage level. LF253DT and LF353DT operate at 6V minimum, providing 3V margin. General Purpose types operate at 3V to 4V minimum, offering greater flexibility for low-voltage designs.
Q: Is the LM258DG4 suitable for new design implementations?
A: No. LM258DG4 is classified as Obsolete product status. Texas Instruments has discontinued this component. New designs must select from Active status alternatives. The LM258DG4 exhibits significantly reduced performance (0.3 V/µs slew rate, 1.1 MHz bandwidth) compared to AD712KRZ and other active substitutes, making it unsuitable for modern applications regardless of availability.
Q: How do slew rate differences affect circuit performance?
A: Slew rate determines the maximum rate of voltage change the amplifier can produce. AD712KRZ specifies 20 V/µs; J-FET substitutes (LF253DT, LF353DT) provide 16 V/µs; General Purpose types range from 2.2 V/µs to 13 V/µs. For high-frequency signal processing or fast transient response requirements, higher slew rate is advantageous. For low-frequency applications (audio, instrumentation below 100 kHz), slew rate differences are negligible. Verify application bandwidth requirements before selecting substitutes with reduced slew rate.
Q: What inventory considerations apply to substitute selection?
A: Inventory levels vary significantly across substitute options. MC4558IDT maintains highest inventory (119,399 pcs), followed by LM833DT (166,607 pcs). LF253DT provides 72,138 pcs; LF353DT provides 6,520 pcs. For high-volume production, parts with larger inventory reduce supply chain risk. For prototype or low-volume applications, inventory levels are less critical. Verify current availability with component suppliers before finalizing design selection.
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