LT1817IGN#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1817IGN#TRPBF is a voltage feedback operational amplifier containing four independent circuits in a 16-SSOP surface mount package, manufactured by Analog Devices Inc. This device is designated as Last Time Buy, indicating discontinued production with limited inventory availability. The part operates across a supply voltage range of 2.5V to 11V with a slew rate of 1500V/µs and gain bandwidth product of 220 MHz, making it suitable for applications requiring moderate-speed signal conditioning and amplification.

Due to Last Time Buy status, identifying equivalent substitute parts is necessary for design continuity and long-term component sourcing strategy. Substitute parts must maintain functional compatibility while accommodating potential differences in package configuration, electrical performance, and supply specifications.

Substiute Parts

LT1817IGN#TRPBF

Analog Devices Inc.In Stock: 926LT1817IGN#TRPBF Datasheet

Current PartRFQ

ADA4807-4ARUZ-R7

Analog Devices Inc.In Stock: 1777ADA4807-4ARUZ-R7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LT1817IGN#TRPBF is evaluated based on the following critical parameters that define functional equivalence:

Functional Compatibility Criteria:

• Amplifier topology (Voltage Feedback)
• Number of independent circuits (4 channels)
• Output drive capability (80 mA per channel minimum)
• Supply voltage range compatibility (overlap within 2.5V to 11V span)
• Operating temperature range (minimum -40°C to 85°C coverage)

Performance Considerations:

• Slew rate and bandwidth characteristics determine signal fidelity in time-domain applications
• Input bias current and offset voltage affect precision measurement circuits
• Supply current consumption impacts power budget and thermal design

Physical and Compliance Requirements:

• Surface mount packaging mandatory for PCB integration
• RoHS3 compliance and MSL rating for manufacturing compatibility
• REACH and ECCN classifications for regulatory alignment

The ADA4807-4ARUZ-R7 qualifies as a substitute based on matching the four-channel voltage feedback topology, output current capability, and overlapping supply voltage specifications. Package differences (14-TSSOP versus 16-SSOP) and performance variations require design verification at the circuit level.

Parameter Comparison

Engineering Selection Recommendations

LT1817IGN#TRPBF Status: The LT1817IGN#TRPBF is designated Last Time Buy with 818 units in stock. This status indicates production discontinuation and limited availability for future procurement. Designs currently utilizing this part number should evaluate transition strategies to ensure long-term supply chain continuity.

ADA4807-4ARUZ-R7 Substitution Basis: The ADA4807-4ARUZ-R7 is an Active product from Analog Devices Inc. with 1700 units in inventory, providing superior long-term availability. Both devices share identical four-channel voltage feedback topology and output current specifications (80 mA per channel). Both maintain RoHS3 compliance, MSL Level 1 rating, REACH Unaffected status, and EAR99 ECCN classification, ensuring regulatory and manufacturing compatibility.

Key Differences Requiring Circuit Evaluation: The ADA4807-4ARUZ-R7 exhibits lower supply current consumption (1 mA versus 6.5 mA across four channels), reduced input bias current (1.2 µA versus 2 µA), and improved input offset voltage (140 µV versus 200 µV). These characteristics provide enhanced power efficiency and precision. However, the substitute part operates at reduced slew rate (250 V/µs versus 1500 V/µs) and -3dB bandwidth (180 MHz versus 350 MHz), which may impact applications requiring high-speed transient response.

The ADA4807-4ARUZ-R7 features rail-to-rail output capability and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), providing additional design flexibility. Minimum supply voltage increases from 2.5V to 2.7V, which is negligible for most applications.

Package Consideration: The substitute part uses 14-TSSOP packaging versus the original 16-SSOP. PCB layout modifications are required to accommodate the different pin count and physical dimensions. Pin-to-pin functional mapping must be verified against specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can the ADA4807-4ARUZ-R7 directly replace the LT1817IGN#TRPBF without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (14-TSSOP versus 16-SSOP). PCB layout redesign is required. Functional substitution is feasible for applications where the reduced slew rate (250 V/µs) and bandwidth (180 MHz) are acceptable. Circuit simulation and bench testing are necessary to validate performance in specific applications.

Q: What are the implications of the lower slew rate in the ADA4807-4ARUZ-R7?

A: The ADA4807-4ARUZ-R7 slew rate of 250 V/µs is approximately one-sixth that of the LT1817IGN#TRPBF (1500 V/µs). This affects the maximum rate of output voltage change and may limit performance in high-speed signal conditioning, fast transient response, or high-frequency filtering applications. Applications with slower signal dynamics or lower frequency content are unaffected.

Q: How does the rail-to-rail output capability of the ADA4807-4ARUZ-R7 affect substitution?

A: Rail-to-rail output extends the usable output voltage range to the supply rails, providing greater dynamic range in low-supply-voltage applications. This is a performance enhancement that does not create incompatibility. Applications not requiring this feature are unaffected.

Q: What is the significance of the extended operating temperature range in the ADA4807-4ARUZ-R7?

A: The ADA4807-4ARUZ-R7 operates to 125°C versus 85°C for the LT1817IGN#TRPBF. This extended range provides design margin for high-temperature environments and thermal stress conditions. Applications operating within the original -40°C to 85°C range experience no change in performance.

Q: Are there supply voltage compatibility issues between these parts?

A: Both parts operate across the 2.7V to 11V range (LT1817IGN#TRPBF minimum is 2.5V). The 0.2V difference in minimum supply voltage is negligible for most applications. Designs operating below 2.7V require retention of the original LT1817IGN#TRPBF.

Q: How do the reduced supply current specifications of the ADA4807-4ARUZ-R7 impact power budget?

A: The ADA4807-4ARUZ-R7 consumes 1 mA across four channels versus 6.5 mA for the LT1817IGN#TRPBF, representing an 85% reduction in quiescent current. This improvement reduces power dissipation, thermal load, and battery drain in portable applications. Existing power supply designs typically accommodate this lower requirement without modification.

Q: What packaging considerations apply to the 14-TSSOP format?

A: The 14-TSSOP package is smaller than 16-SSOP, reducing PCB footprint. Pin spacing and lead configuration differ, requiring new PCB artwork and assembly programming. Standard surface mount assembly processes accommodate both package types without equipment modifications.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts maintain identical RoHS3 compliance, MSL Level 1 rating, REACH Unaffected status, and EAR99 ECCN classification. No regulatory or compliance barriers exist for substitution from a compliance perspective.

Q: What inventory considerations should guide substitution decisions?

A: The LT1817IGN#TRPBF is Last Time Buy with 818 units available. The ADA4807-4ARUZ-R7 is Active with 1700 units in stock and ongoing production. For new designs or long-term production, the ADA4807-4ARUZ-R7 provides superior supply chain security and availability.