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LT1220CS8 Equivalent & Substitute Parts
Part Overview
The LT1220CS8 is a general purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This single-circuit amplifier is designed for applications requiring moderate bandwidth and slew rate performance with low input bias current. The part is currently active in production with 1,871 units in stock.
Substitute parts become necessary when the primary part number reaches end-of-life status, when alternative packaging formats are required for manufacturing processes, or when design requirements necessitate enhanced performance characteristics within compatible package geometries. The LT1220CS8 operates within a 10V to 30V supply range and maintains performance across the 0°C to 70°C industrial temperature range.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Slew Rate | 250 | V/µs |
| Gain Bandwidth Product | 45 | MHz |
| Current - Input Bias | 100 | nA |
| Voltage - Input Offset | 500 | µV |
| Current - Supply | 8 | mA |
| Current - Output / Channel | 26 | mA |
| Voltage - Supply Span (Min) | 10 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | 0 to 70 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LT1220CS8 is determined by compatibility across the following critical parameters: package type (8-SOIC surface mount), number of circuits (single), amplifier classification, supply voltage range overlap, operating temperature range, and output current capability.
Direct Substitutes maintain identical electrical specifications and differ only in packaging format or tape/reel configuration. These parts are interchangeable without circuit redesign.
Similar Substitutes share the same physical package and mounting type but exhibit variations in one or more electrical parameters. Selection of similar substitutes requires verification that the application tolerates the parameter differences, particularly in slew rate, gain bandwidth product, input bias current, supply current, output current, and supply voltage range.
The following parameters establish substitution boundaries:
- Package geometry: 8-SOIC (0.154", 3.90mm Width)
- Mounting type: Surface Mount
- Number of circuits: 1
- Supply voltage minimum: 10V or lower
- Supply voltage maximum: 30V or higher
- Operating temperature: 0°C to 70°C or extended range
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (µV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LT1220CS8 | Analog Devices | General Purpose | 250 | 45 | 100 | 500 | 8 | 26 | 10 | 30 | 0 to 70 | 8-SOIC |
| LT1220CS8#PBF | Analog Devices | General Purpose | 250 | 45 | 100 | 500 | 8 | 26 | 10 | 30 | 0 to 70 | 8-SOIC |
| AD817ARZ | Analog Devices | General Purpose | 350 | 50 | 3300 | 500 | 7 | 50 | 5 | 36 | -45 to 85 | 8-SOIC |
| AD817ARZ-REEL | Analog Devices | General Purpose | 350 | 50 | 3300 | 500 | 7 | 50 | 5 | 36 | -40 to 85 | 8-SOIC |
| AD847JRZ-REEL7 | Analog Devices | General Purpose | 300 | 50 | 3300 | 500 | 5.3 | 32 | 9 | 36 | 0 to 70 | 8-SOIC |
| THS4051CD | Texas Instruments | Voltage Feedback | 240 | — | 2500 | 2500 | 8.5 | 100 | 9 | 32 | 0 to 70 | 8-SOIC |
| THS4051IDR | Texas Instruments | Voltage Feedback | 240 | — | 2500 | 2500 | 8.5 | 100 | 9 | 32 | -40 to 85 | 8-SOIC |
| INA145UA/2K5 | Texas Instruments | Differential | 0.45 | — | 50 | 200 | 0.57 | 15 | 4.5 | 36 | -40 to 85 | 8-SOIC |
| INA149AIDR | Texas Instruments | Differential | 5 | — | — | 350 | 0.81 | 25 | 4 | 36 | -40 to 125 | 8-SOIC |
| TLE2037QDRG4Q1 | Texas Instruments | General Purpose | 7.5 | 50 | 15 | 20 | 3.8 | 50 | 8 | 38 | -40 to 125 | 8-SOIC |
Engineering Selection Recommendations
Direct Substitution (No Circuit Redesign Required)
LT1220CS8#PBF is a direct functional equivalent differing only in packaging format (tube versus standard packaging). This part maintains all electrical specifications and operating characteristics of the primary part number. Both parts are ROHS3 compliant, carry MSL Level 1 (Unlimited), and are manufactured by Analog Devices Inc. Selection between these two part numbers depends solely on manufacturing process requirements and tape/reel availability.
Compatible Substitutes with Parameter Variations
AD817ARZ and AD817ARZ-REEL are general purpose amplifiers in the same 8-SOIC package with enhanced performance characteristics. These parts provide higher slew rate (350V/µs versus 250V/µs), increased gain bandwidth product (50MHz versus 45MHz), and greater output current capability (50mA versus 26mA). However, input bias current is significantly higher (3.3µA versus 100nA). Supply voltage range is expanded (5V to 36V versus 10V to 30V), and operating temperature extends to -40°C or -45°C. Both variants are ROHS3 compliant with MSL Level 1. The AD817ARZ-REEL variant is available in higher quantity (17,905 units).
AD847JRZ-REEL7 offers moderate performance enhancement with 300V/µs slew rate and 50MHz gain bandwidth product. Supply current is reduced to 5.3mA, and the part maintains the 0°C to 70°C operating temperature range matching the primary part. Supply voltage minimum is 9V, which is within acceptable tolerance of the 10V specification. This part is ROHS3 compliant with MSL Level 1.
Functional Alternatives with Different Amplifier Classification
THS4051CD, THS4051ID, and THS4051IDR are voltage feedback amplifiers with comparable slew rate (240V/µs) and higher output current (100mA). These parts are suitable for applications requiring increased output drive capability. Input offset voltage is higher (2.5mV versus 500µV), and input bias current is elevated (2.5µA versus 100nA). Supply voltage range is 9V to 32V. The THS4051IDR variant supports extended temperature range (-40°C to 85°C) and is available in cut tape format with 5,143 units in stock. All variants are ROHS3 compliant with MSL Level 1.
INA145UA/2K5 and INA149AIDR are differential amplifiers with fundamentally different circuit topology and application focus. These parts exhibit significantly lower slew rate and supply current but are optimized for differential signal conditioning. Input offset voltage is lower (200µV to 350µV), and supply voltage range extends to 4.5V minimum. These parts are not recommended as direct substitutes for general purpose amplifier applications. INA145UA/2K5 carries MSL Level 3 (168 Hours), while INA149AIDR carries MSL Level 2 (1 Year).
Automotive-Grade Alternative
TLE2037QDRG4Q1 is an automotive-qualified general purpose amplifier (AEC-Q100) with superior performance specifications including 7.5V/µs slew rate, 50MHz gain bandwidth product, and 15nA input bias current. This part supports extended temperature range (-40°C to 125°C) and expanded supply voltage (8V to 38V). However, this part is discontinued at DiGi Electronics and should be considered only when automotive qualification is a mandatory requirement. The part is ROHS3 compliant with MSL Level 1.
Frequently Asked Questions (FAQ)
Q: Can LT1220CS8#PBF be used as a direct replacement for LT1220CS8?
A: Yes. LT1220CS8#PBF is electrically and functionally identical to LT1220CS8. The difference is packaging format: LT1220CS8#PBF is supplied in tube packaging, while LT1220CS8 uses standard packaging. Both parts are ROHS3 compliant with identical electrical specifications, operating temperature range, and supply voltage requirements. Selection depends on manufacturing process compatibility with tape/reel or tube formats.
Q: What are the key differences between LT1220CS8 and AD817ARZ?
A: Both are general purpose amplifiers in 8-SOIC packages, but AD817ARZ offers enhanced performance. AD817ARZ provides higher slew rate (350V/µs versus 250V/µs), higher gain bandwidth product (50MHz versus 45MHz), and greater output current (50mA versus 26mA). However, AD817ARZ has significantly higher input bias current (3.3µA versus 100nA) and operates across a wider supply voltage range (5V to 36V versus 10V to 30V). AD817ARZ also supports extended temperature operation (-40°C to 85°C). Applications sensitive to input bias current may not tolerate this substitution.
Q: Can differential amplifiers like INA145UA/2K5 replace the LT1220CS8?
A: No. Differential amplifiers are fundamentally different circuit topologies designed for differential signal conditioning applications. While both are housed in 8-SOIC packages, the INA145UA/2K5 exhibits extremely low slew rate (0.45V/µs versus 250V/µs) and is not suitable for general purpose amplifier applications. Differential amplifiers require different circuit design and biasing approaches.
Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?
A: MSL rating indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering. LT1220CS8 carries MSL Level 1 (Unlimited), meaning it can be stored indefinitely without special moisture control. INA145UA/2K5 carries MSL Level 3 (168 Hours), requiring more stringent moisture control and baking procedures before assembly. This affects supply chain handling and manufacturing process requirements.
Q: Is the TLE2037QDRG4Q1 a viable substitute despite being discontinued?
A: TLE2037QDRG4Q1 is discontinued at DiGi Electronics and should not be selected for new designs. While it offers superior performance specifications and automotive qualification (AEC-Q100), discontinued status means future availability cannot be guaranteed. New designs should select from active product status parts: LT1220CS8#PBF, AD817ARZ-REEL, AD847JRZ-REEL7, or THS4051IDR.
Q: What supply voltage range compatibility must be verified when substituting parts?
A: The LT1220CS8 operates from 10V to 30V. Substitute parts must support this range or a compatible subset. AD817ARZ (5V to 36V) and AD847JRZ-REEL7 (9V to 36V) both accommodate the 10V to 30V requirement. THS4051 variants (9V to 32V) also support this range. INA145UA/2K5 (4.5V to 36V) and INA149AIDR (4V to 36V) support the range but are differential amplifiers with different applications. Always verify that the substitute part's supply voltage range encompasses the application's operating requirements.
Q: How does package geometry affect substitution decisions?
A: All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring physical compatibility with existing PCB layouts and assembly equipment. Package geometry is identical across all parts, eliminating the need for PCB redesign. Differences exist only in tape/reel versus tube packaging formats, which affect manufacturing process compatibility but not circuit board placement or soldering procedures.
Q: What role does RoHS compliance play in part selection?
A: All listed parts are ROHS3 compliant, meeting the Restriction of Hazardous Substances directive requirements. This compliance status is mandatory for most commercial and industrial applications. ROHS3 compliance ensures the parts do not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above specified thresholds. All substitute parts maintain this compliance status, eliminating regulatory concerns in substitution decisions.
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