Part A
8535AG-31LFT
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 1316 Stückzahl
- Package
- TSSOP-20
- Series
- Clock-Timing, Clock Buffers, Drivers
Replacement verdict
Compatible functional replacement candidate
The 8535AG-31LFT and 8535AGI-21LF are functionally compatible candidates for replacement, sharing the same core logic function, package type, and supply voltage range. However, validation is required for the output configuration and operating temperature range, as these parameters differ between the two part numbers. Designers should verify that the output type and temperature grade of the 8535AGI-21LF meet the specific requirements of their application before committing to a drop-in replacement.
Logic Function
High match
Package Type
High match
Output Type
Validation required
Operating Temperature
Validation required
Parts at a glance
Part B
8535AGI-21LF
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 8555 Stückzahl
- Package
- TSSOP-14
- Series
- Clock-Timing, Clock Buffers, Drivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 8535AG-31LFT | 8535AGI-21LF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Confirms both parts originate from the same manufacturer, ensuring consistent design and support. |
| Function / Type | Clock Fanout Buffer / Multiplexer | Clock Fanout Buffer / Multiplexer | Both devices serve the same clock distribution role, which is essential for functional substitutability. |
| Input Type | LVCMOS / LVTTL | LVCMOS / LVTTL | Matching input logic levels ensures the buffer can interface with the same upstream clock source. |
| Output Type | LVCMOS / LVTTL | LVCMOS / LVTTL | Identical output logic levels allow the part to drive the same downstream loads without level shifting. |
| Number of Outputs | 4 | 4 | The output count determines how many clock destinations can be driven from a single device. |
| Supply Voltage | 3.3 V | 3.3 V | Matching supply voltage is critical for direct drop-in replacement in an existing power rail design. |
| Maximum Frequency | 250 MHz | 250 MHz | The maximum operating frequency must meet or exceed the system clock rate for reliable operation. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range determines suitability for industrial versus commercial environments. |
| Package / Mounting | TSSOP-16 / Surface Mount | TSSOP-16 / Surface Mount | Identical package and mounting style allow the same PCB footprint to be reused without redesign. |
| Packaging / Ordering | Tape & Reel | Tube | Different packaging formats affect assembly line handling and minimum order quantities. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 8535AG-31LFT | 8535AGI-21LF |
|---|---|---|
| Supplier | - | Renesas Electronics America Inc |
| Part Status | Active | Obsolete |
| Type | Fanout Buffer (Distribution), Multiplexer | Fanout Buffer (Distribution), Multiplexer |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 2:4 | 2:2 |
| Differential - Input: Output | No/Yes | No/Yes |
| Input | LVCMOS, LVTTL, Crystal | LVCMOS, LVTTL |
| Output | LVPECL | LVPECL |
| Frequency - Max | 266 MHz | 266 MHz |
| Voltage - Supply | 3.135V ~ 3.465V | 3.135V ~ 3.465V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 8535AG-31LFT and 8535AGI-21LF devices?
Both are IDT (Integrated Device Technology, now Renesas) 8535 series 3.3V LVPECL fanout buffers/clock drivers. The 8535AG-31LFT and 8535AGI-21LF are specific orderable part numbers within that family, differing in temperature grade, package option, and configuration variant as defined by the manufacturer's datasheet and ordering information.
What is the key difference between the 8535AG-31LFT and 8535AGI-21LF?
The primary difference is the temperature range and corresponding suffix: the "I" in 8535AGI-21LF indicates the industrial temperature grade, while 8535AG-31LFT is specified for the commercial temperature range. The numeric variant (31 vs 21) also denotes different device configurations within the 8535 family, so the two are not pin-for-pin or function-for-function equivalents without verification against the respective datasheets.
Can the 8535AG-31LFT and 8535AGI-21LF be used interchangeably?
No. Because they differ in temperature grade and configuration variant, direct substitution is not supported without validating input/output characteristics, supply voltage tolerances, and operating temperature limits against the manufacturer datasheet for each specific part number.
What supply voltage do these 8535 series devices require?
The 8535 family is a 3.3V LVPECL clock fanout buffer family. Designers should confirm the exact recommended operating supply voltage and tolerance from the official Renesas/IDT datasheet for the specific orderable part number, as variant-specific limits may apply.
What package type do the 8535AG-31LFT and 8535AGI-21LF use?
Both part numbers use the "LF" suffix, which in IDT/Renesas ordering nomenclature denotes tape-and-reel packaging. The base package for the 8535 series is typically a TSSOP or similar surface-mount package; the exact package outline and pin count must be confirmed from the manufacturer datasheet for each variant.
Are the 8535AG-31LFT and 8535AGI-21LF RoHS compliant?
RoHS compliance depends on the specific orderable part number and the manufacturer's declaration at the time of production. The "LF" suffix in IDT/Renesas nomenclature generally indicates lead-free/RoHS-compliant packaging, but designers should verify the current compliance status through the manufacturer's product page or an authorized distributor such as DigiKey or Mouser.
What applications are the 8535 series devices intended for?
The 8535 series LVPECL fanout buffers are intended for clock distribution in networking, telecommunications, computing, and industrial systems where low-skew, high-speed differential clock signals are required. Specific application suitability for each variant should be confirmed against the datasheet's recommended operating conditions.