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AD847JR Equivalent & Substitute Parts
Part Overview
The AD847JR is a general-purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device is classified as obsolete, though 12,000 units remain in stock as new original inventory. The AD847JR operates across a supply voltage range of 9V to 36V with a slew rate of 300V/µs and a gain bandwidth product of 50 MHz, making it suitable for general-purpose amplification applications in the 0°C to 70°C operating temperature range.
Due to its obsolete product status, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and system reliability in applications where the AD847JR is currently deployed or specified.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Slew Rate | 300 | V/µs |
| Gain Bandwidth Product | 50 | MHz |
| Current - Input Bias | 3.3 | µA |
| Voltage - Input Offset | 500 | µV |
| Current - Supply | 5.3 | mA |
| Current - Output / Channel | 32 | mA |
| Voltage - Supply Span (Min) | 9 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | 0 to 70 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the AD847JR is evaluated based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:
Direct Substitutes (Identical Electrical Performance): Parts that maintain identical electrical specifications across all key parameters—slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, output current capability, and supply voltage range—while differing only in packaging format or product status. The AD847JRZ qualifies as a direct substitute, offering identical electrical performance with active product status and RoHS3 compliance.
Similar Substitutes (Functional Equivalence with Parameter Variance): Parts that operate within the same functional category (linear amplifiers, 8-SOIC package, surface mount) but exhibit different electrical characteristics. The LT1122 series (J-FET amplifier type) and LT1354 series (voltage feedback amplifier type) fall into this category. These parts maintain compatible package geometry and mounting type but differ in amplifier topology, slew rate, gain bandwidth product, input bias current, and operating temperature range. Selection of similar substitutes requires verification that the application tolerates the specified parameter deviations.
Key Parameters Determining Substitutability:
- Amplifier type and circuit topology
- Slew rate (300V/µs for AD847JR)
- Gain bandwidth product (50 MHz for AD847JR)
- Input bias current (3.3 µA for AD847JR)
- Supply voltage range compatibility (9V to 36V for AD847JR)
- Package type and pin configuration (8-SOIC)
- Operating temperature range (0°C to 70°C for AD847JR)
Parameter Comparison
| Part Number | Manufacturer | Product Status | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (µA) | Input Offset (µV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AD847JR | Analog Devices Inc. | Obsolete | General Purpose | 300 | 50 | 3.3 | 500 | 5.3 | 32 | 9 | 36 | 0 to 70 | 8-SOIC |
| AD847JRZ | Analog Devices Inc. | Active | General Purpose | 300 | 50 | 3.3 | 500 | 5.3 | 32 | 9 | 36 | 0 to 70 | 8-SOIC |
| LT1122CS8 | Linear Technology | Active | J-FET | 75 | 13 | 0.012 | 130 | 7.8 | — | 10 | 36 | -40 to 85 | 8-SOIC |
| LT1122CS8#PBF | Analog Devices Inc. | Active | J-FET | 75 | 13 | 0.012 | 130 | 7.8 | — | 10 | 36 | -40 to 85 | 8-SOIC |
| LT1122CS8#TR | Analog Devices Inc. | Active | J-FET | 75 | 13 | 0.012 | 130 | 7.8 | — | 10 | 36 | -40 to 85 | 8-SOIC |
| LT1122CS8#TRPBF | Analog Devices Inc. | Active | J-FET | 75 | 13 | 0.012 | 130 | 7.8 | — | 10 | 36 | -40 to 85 | 8-SOIC |
| LT1122DS8#PBF | Analog Devices Inc. | Active | J-FET | 75 | 13 | 0.012 | 130 | 7.8 | — | 10 | 36 | -40 to 85 | 8-SOIC |
| LT1122DS8#TRPBF | Analog Devices Inc. | Active | J-FET | 75 | 13 | 0.012 | 130 | 7.8 | — | 10 | 36 | -40 to 85 | 8-SOIC |
| LT1354CS8#PBF | Analog Devices Inc. | Active | Voltage Feedback | 400 | 12 | 0.080 | 300 | 1 | 30 | 5 | 30 | 0 to 70 | 8-SOIC |
| LT1354CS8#TRPBF | Analog Devices Inc. | Active | Voltage Feedback | 400 | 12 | 0.080 | 300 | 1 | 30 | 5 | 30 | 0 to 70 | 8-SOIC |
| LT1354IS8#PBF | Analog Devices Inc. | Active | Voltage Feedback | 400 | 12 | 0.080 | 300 | 1 | 30 | 5 | 30 | -40 to 85 | 8-SOIC |
Engineering Selection Recommendations
Direct Substitution (Recommended for Obsolescence Mitigation):
The AD847JRZ is the primary recommended substitute for the AD847JR. This part maintains identical electrical specifications across all parameters while offering active product status and RoHS3 compliance. The AD847JRZ is available in tube packaging with 1,313 units in stock. Selection of AD847JRZ eliminates obsolescence risk while preserving circuit performance and design compatibility.
Conditional Substitution (Application-Dependent):
The LT1122 series (LT1122CS8, LT1122CS8#PBF, LT1122CS8#TR, LT1122CS8#TRPBF, LT1122DS8#PBF, LT1122DS8#TRPBF) represents a functional alternative for applications where J-FET input characteristics are acceptable. These parts feature significantly lower input bias current (12 pA versus 3.3 µA), lower input offset voltage (130 µV versus 500 µV), and extended operating temperature range (-40°C to 85°C). However, the LT1122 series exhibits reduced slew rate (75V/µs versus 300V/µs) and lower gain bandwidth product (13 MHz versus 50 MHz). These parts are suitable only for applications where the reduced bandwidth and slew rate do not compromise system performance.
The LT1354 series (LT1354CS8#PBF, LT1354CS8#TRPBF, LT1354IS8#PBF) offers voltage feedback topology with higher slew rate (400V/µs) but lower gain bandwidth product (12 MHz) and reduced supply voltage range (5V to 30V maximum versus 36V maximum). The LT1354 series is applicable only to applications operating within the 5V to 30V supply range where the reduced bandwidth is acceptable.
Compliance and Availability:
All recommended substitute parts carry RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental standards. Packaging options include tube and tape & reel formats across multiple temperature grades (commercial 0°C to 70°C and industrial -40°C to 85°C).
Frequently Asked Questions (FAQ)
Q: Can AD847JRZ be used as a direct replacement for AD847JR?
A: Yes. The AD847JRZ provides identical electrical performance across all specified parameters. The only differences are packaging format (tube versus unspecified) and product status (active versus obsolete). No circuit modifications are required.
Q: What are the key differences between AD847JR and LT1122 series amplifiers?
A: The primary differences are amplifier topology (general purpose versus J-FET input), slew rate (300V/µs versus 75V/µs), gain bandwidth product (50 MHz versus 13 MHz), and input bias current (3.3 µA versus 12 pA). The LT1122 series is suitable only for applications where reduced bandwidth and lower input bias current are beneficial or acceptable.
Q: Are the LT1354 series parts compatible with the AD847JR supply voltage range?
A: Partial compatibility exists. The LT1354 series maximum supply voltage is 30V, while the AD847JR operates to 36V. Applications requiring supply voltages above 30V cannot use LT1354 substitutes. The LT1354 minimum supply voltage is 5V, which is lower than the AD847JR minimum of 9V.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in tube and tape & reel (TR) packaging formats. All parts maintain the 8-SOIC (0.154", 3.90mm width) surface mount package geometry, ensuring mechanical compatibility with existing PCB layouts.
Q: Do substitute parts meet RoHS and REACH compliance requirements?
A: All recommended substitute parts carry RoHS3 compliance and REACH unaffected status. The AD847JR is not specified for these certifications due to its obsolete status.
Q: Which substitute part offers the best long-term availability?
A: The AD847JRZ is the optimal choice for long-term availability, with active product status and 1,313 units in current stock. This part eliminates obsolescence risk while maintaining complete electrical and mechanical compatibility.
Q: Can multiple LT1122 variants be used interchangeably?
A: The LT1122 variants (CS8, CS8#PBF, CS8#TR, CS8#TRPBF, DS8#PBF, DS8#TRPBF) differ only in packaging format and temperature grade. All variants maintain identical electrical specifications. Selection depends on packaging requirements (tube versus tape & reel) and operating temperature range (commercial 0°C to 70°C or industrial -40°C to 85°C).
Q: What is the impact of lower slew rate in LT1122 substitutes?
A: The LT1122 slew rate of 75V/µs is approximately one-quarter that of the AD847JR (300V/µs). Applications requiring fast transient response or high-frequency signal conditioning may experience performance degradation. Applications with slower signal rates or lower frequency content are unaffected.
Q: Is the LT1354 series suitable for high-voltage supply applications?
A: No. The LT1354 series maximum supply voltage is 30V, making it unsuitable for applications requiring the full 36V capability of the AD847JR. The LT1354 is limited to systems operating at 30V or below.
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