Part A
8535AGI-31LFT
ルネサス エレクトロニクス アメリカ株式会社
- Lifecycle
- Active
- Stock
- 3663 個数
- Package
- TSSOP-20
- Series
- クロックタイミング - クロックバッファ、ドライバ
Replacement verdict
Compatible functional replacement candidate
The 8535AGI-31LFT and 8535AG-01LF are functionally compatible clock fanout buffers with matching logic family, channel count, and supply voltage requirements. Both devices share the same 20-pin TSSOP footprint and operate over the industrial temperature range, making the 8535AGI-31LFT a viable replacement candidate for the 8535AG-01LF in most applications. Designers should verify output termination and signal integrity requirements for their specific load conditions before finalizing the substitution.
Logic Family
High match
Channel Count
High match
Package Type
High match
Output Type
Validation required
Parts at a glance
Part B
8535AG-01LF
ルネサス エレクトロニクス アメリカ株式会社
- Lifecycle
- Active
- Stock
- 5933 個数
- Package
- TSSOP-20
- Series
- クロックタイミング - クロックバッファ、ドライバ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 8535AGI-31LFT | 8535AG-01LF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Identical manufacturer ensures consistent design, documentation, and quality standards. |
| Function | Clock Fanout Buffer / Multiplexer | Clock Fanout Buffer / Multiplexer | Same core function allows direct substitution in clock distribution designs. |
| Number of Outputs | 4 | 4 | Matching output count ensures the same number of clock loads can be driven. |
| Input Type | Differential (LVPECL, LVDS, HCSL, etc.) | Differential (LVPECL, LVDS, HCSL, etc.) | Compatible input types allow the same source clock to drive either device. |
| Output Type | LVPECL | LVPECL | Identical output signaling ensures downstream receivers remain compatible. |
| Supply Voltage | 3.3 V | 3.3 V | Same supply voltage allows use in the same power rail without level shifting. |
| Package / Case | 20-TSSOP | 20-TSSOP | Identical package ensures the same PCB footprint and assembly process. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature range supports use in the same environmental conditions. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting method ensures compatibility with existing board assembly. |
| Packaging | Tape & Reel | Tube | Different packaging affects handling and automated assembly; verify reflow profile and moisture sensitivity. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 8535AGI-31LFT | 8535AG-01LF |
|---|---|---|
| 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 | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 8535AGI-31LFT and 8535AG-01LF devices?
Both are IDT (Integrated Device Technology, now Renesas) 8535 series 3.3V LVPECL fanout buffers. The 8535AGI-31LFT is a 1-to-4 differential-to-LVPECL fanout buffer in a 20-lead TSSOP package, and the 8535AG-01LF is a 1-to-4 differential-to-LVPECL fanout buffer in a 20-lead TSSOP package. Both operate from a 3.3V supply and are specified for industrial temperature ranges.
What is the difference between the 8535AGI-31LFT and the 8535AG-01LF?
The primary difference is the input type and output enable configuration. The 8535AGI-31LFT features a crystal input and accepts a 25MHz fundamental crystal, while the 8535AG-01LF accepts a differential clock input (LVPECL, LVDS, or LVTTL). The 8535AGI-31LFT also includes an integrated crystal oscillator circuit, whereas the 8535AG-01LF is a pure fanout buffer without crystal input capability.
Are the 8535AGI-31LFT and 8535AG-01LF pin-to-pin compatible?
No. Although both are offered in a 20-lead TSSOP package, the pin functions differ. The 8535AGI-31LFT includes crystal input pins (X1, X2) and associated oscillator circuitry, while the 8535AG-01LF has differential clock input pins (CLK, nCLK). The pin assignments are not identical, so they cannot be used as direct drop-in replacements without verifying the pinout against the respective datasheets.
What is the maximum output frequency of these devices?
Both the 8535AGI-31LFT and 8535AG-01LF support output frequencies up to 700MHz, depending on the input frequency and configuration. The 8535AGI-31LFT with a 25MHz crystal input can generate output frequencies up to 700MHz through the internal PLL and divider settings. The 8535AG-01LF passes the input clock directly to the outputs, so its maximum output frequency is limited by the input signal and the device's 700MHz maximum operating frequency.
What is the operating temperature range for these devices?
Both the 8535AGI-31LFT and 8535AG-01LF are specified for the industrial temperature range of -40°C to +85°C. This makes them suitable for industrial, networking, and telecommunications applications requiring reliable operation over extended temperature ranges.
What supply voltage do the 8535AGI-31LFT and 8535AG-01LF require?
Both devices operate from a single 3.3V supply (VCC = 3.3V ± 5%). The LVPECL outputs are designed to drive 50Ω transmission lines to VCC - 2V, which is standard for 3.3V LVPECL logic. Proper decoupling and termination are required for reliable operation.
Can the 8535AGI-31LFT and 8535AG-01LF be used interchangeably in an existing design?
No, they are not interchangeable without design changes. The 8535AGI-31LFT requires an external crystal and includes an on-chip oscillator, while the 8535AG-01LF requires an external differential clock source. The input structures, pinouts, and external component requirements differ, so substituting one for the other would require schematic and layout modifications, as well as verification against the respective datasheets.
What package type do the 8535AGI-31LFT and 8535AG-01LF use?
Both devices are available in a 20-lead TSSOP (Thin Shrink Small Outline Package) with a 4.4mm body width. The "LF" suffix in both part numbers indicates Pb-free (RoHS-compliant) packaging. The "T" suffix on the 8535AGI-31LFT indicates tape-and-reel packaging, while the 8535AG-01LF is typically supplied in tubes or tape-and-reel depending on the ordering quantity.
What are the typical applications for the 8535AGI-31LFT and 8535AG-01LF?
Both devices are used in applications requiring low-jitter LVPECL clock distribution, such as networking equipment (routers, switches), telecommunications systems, servers, and high-performance computing. The 8535AGI-31LFT is particularly suited for applications where a crystal-based reference clock is needed, while the 8535AG-01LF is used where a differential clock source is already available and only fanout buffering is required.