8535AG-31LFT vs 8535AGI-01LF

Both are ICS8535 series clock fanout buffers from Renesas (formerly IDT). The 8535AG-31LFT and 8535AGI-01LF are 3.3V, high-performance clock distribution devices that accept differential or single-ended inputs and provide multiple low-skew outputs. The "LFT" and "LF" suffixes indicate tape-and-reel packaging in a lead-free (RoHS-compliant) configuration.

The primary difference is the operating temperature range and the specific device configuration. The 8535AG-31LFT is specified for the commercial temperature range (0°C to +70°C), while the 8535AGI-01LF is specified for the industrial temperature range (-40°C to +85°C). The "I" in the part number denotes the industrial temperature grade. The "-31" and "-01" suffixes indicate different output configurations or input/output logic options as defined in the respective datasheets.

Both devices are offered in the same package type (TSSOP-20 or similar, depending on the specific datasheet revision). However, pin-to-pin compatibility cannot be assumed solely based on package. The "-31" and "-01" suffixes may indicate different pin functions or output enable configurations. Designers must verify the pinout and function tables in the respective Renesas datasheets before considering a direct replacement.

No. The 8535AG-31LFT is rated only for the commercial temperature range (0°C to +70°C), while the 8535AGI-01LF is rated for the industrial range (-40°C to +85°C). Using the commercial-grade device in an industrial environment may result in unreliable operation or out-of-specification performance. Additionally, the different suffix codes may imply different functional configurations, so a direct drop-in replacement is not recommended without full validation.

Both devices operate from a 3.3V supply (with 2.5V operation possible in some configurations). They feature low output skew (typically less than 50 ps), low propagation delay, and support clock frequencies up to 700 MHz or higher depending on the input/output configuration. They provide multiple LVCMOS/LVTTL outputs from a differential or single-ended input. For exact limits, refer to the specific Renesas datasheet for each part number.

Both the 8535AG-31LFT and 8535AGI-01LF are typically offered in a 20-lead TSSOP package. The "LFT" and "LF" suffixes indicate tape-and-reel packaging. The "LF" designation confirms lead-free (Pb-free) and RoHS-compliant construction. The "T" in "LFT" specifically denotes tape-and-reel, while "LF" alone may also indicate tape-and-reel depending on the manufacturer's convention.

The 8535 series are clock fanout buffers designed to distribute a single clock input to multiple outputs with minimal skew and jitter. They are commonly used in networking, telecommunications, and computing systems to provide clean, synchronized clock signals to multiple components. They accept differential inputs (e.g., LVPECL, LVDS, or HCSL) or single-ended inputs and provide LVCMOS/LVTTL outputs.

Official datasheets are available from Renesas Electronics (the manufacturer) and authorized distributors such as DigiKey, Mouser, and TTI. The datasheets provide complete electrical characteristics, pinouts, application information, and ordering information. Always consult the latest revision from the manufacturer's website for the most accurate and verified parameters.