Part A
8535AG-31LFT
Renesas Electronics, États - Unis
- Lifecycle
- Active
- Stock
- 1316 PCS
- Package
- TSSOP-20
- Series
- Horloge Timing - clock Buffers, Drives
Replacement verdict
Compatible functional replacement candidate
The 8535AG-31LFT and 8535AG-01LFT are functionally compatible clock fanout buffers from the same series, sharing identical package, pinout, supply voltage, and output drive characteristics. The primary distinction lies in the input interface configuration, where the 8535AG-31LFT provides a crystal input option while the 8535AG-01LFT is optimized for differential input signals. Designers should verify that the input signal chain aligns with the selected variant before committing to a drop-in substitution.
Package Type
High match
Output Type
High match
Input Interface
Validation required
Supply Voltage
High match
Parts at a glance
Part B
8535AG-01LFT
Renesas Electronics, États - Unis
- Lifecycle
- Active
- Stock
- 7800 PCS
- Package
- TSSOP-20
- Series
- Horloge Timing - clock Buffers, Drives
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 | 8535AG-01LFT | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Same manufacturer ensures consistent quality, documentation, and supply chain support. |
| Series | 8535 | 8535 | Belonging to the same series indicates shared architecture and similar functional characteristics. |
| Package / Case | 20-TSSOP | 20-TSSOP | Identical package allows drop-in replacement on the same PCB footprint. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting style ensures compatibility with the existing assembly process. |
| Function | Clock Generator / Fanout Buffer | Clock Generator / Fanout Buffer | Matching primary function is essential for functional substitutability in clock distribution designs. |
| Number of Outputs | 4 | 4 | Same output count ensures the same number of clock lines can be driven. |
| Supply Voltage | 3.135V ~ 3.465V | 3.135V ~ 3.465V | Compatible supply voltage range allows use in the same power rail design. |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | Same temperature range ensures both parts meet the same environmental requirements. |
| Output Frequency | 31.25MHz | 125MHz | Different output frequencies mean the parts are not directly interchangeable without clock reconfiguration. |
| Input Frequency | 31.25MHz | 125MHz | Input frequency difference affects the reference clock source required for each device. |
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 | 8535AG-01LFT |
|---|---|---|
| Supplier | - | Renesas Electronics America Inc |
| Part Status | Active | Active |
| Type | Fanout Buffer (Distribution), Multiplexer | Fanout Buffer (Distribution), Multiplexer |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 2:4 | 2:4 |
| 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 | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the 8535AG-31LFT and the 8535AG-01LFT?
The 8535AG-31LFT and 8535AG-01LFT are both IDT (now Renesas) 8535 series 3.3V LVPECL fanout buffers, but they differ in their output configuration options. The 8535AG-31LFT provides a specific output enable/disable and frequency select configuration, while the 8535AG-01LFT offers a different default output state and control logic. Designers must consult the respective datasheets to confirm the exact control pin logic and default states before substitution.
Are the 8535AG-31LFT and 8535AG-01LFT pin-to-pin compatible?
Both devices are offered in the same 20-pin TSSOP package (suffix "LFT" indicates tape and reel, Pb-free), and they share the same basic pinout for power, ground, and clock inputs. However, the function of certain control pins may differ between the two versions. Pin-to-pin compatibility is therefore conditional on the specific control pin assignments documented in each device's datasheet.
Can the 8535AG-31LFT directly replace the 8535AG-01LFT in an existing design?
Direct replacement is not guaranteed without validation. Although both are 3.3V LVPECL fanout buffers in the same package, the -31 and -01 variants may have different output enable polarity, default output states, or frequency select logic. The designer must compare the control pin truth tables and AC/DC specifications from the official Renesas datasheets for both part numbers before substituting.
What is the operating supply voltage and output type for these devices?
Both the 8535AG-31LFT and 8535AG-01LFT operate from a 3.3V nominal supply and provide LVPECL (Low-Voltage Positive Emitter-Coupled Logic) outputs. They are designed for clock distribution applications requiring low skew and high fanout. Exact supply voltage tolerance and output voltage swing should be verified from the manufacturer datasheet.
What package and packing option does the "LFT" suffix indicate?
The "LFT" suffix on both 8535AG-31LFT and 8535AG-01LFT indicates a 20-pin TSSOP package that is Pb-free (RoHS-compliant) and supplied in tape-and-reel packaging for automated assembly. The "LF" portion denotes lead-free, and "T" denotes tape and reel.
Are the 8535AG-31LFT and 8535AG-01LFT RoHS compliant?
Yes. Both the 8535AG-31LFT and 8535AG-01LFT carry the "LF" designation in their part numbers, which indicates Pb-free, RoHS-compliant construction as defined by the manufacturer. Customers should still confirm the current RoHS status via the official Renesas product page or a trusted distributor such as DigiKey or Mouser, as compliance declarations can be updated.
What are the typical applications for the 8535AG-31LFT and 8535AG-01LFT?
These devices are typically used in clock distribution networks for networking equipment, servers, storage systems, and telecommunications hardware where low-skew LVPECL fanout is required. The choice between the -31 and -01 variants depends on the required output enable/disable behavior and default output state for the target system.