Part A
9DBL0452BKILFT
Renesas Electronics Corporation
- Lifecycle
- Active
- Stock
- 1308 PCS
- Series
- Clock-Timing - Application Specific Clock-Timing
Replacement verdict
Compatible functional replacement candidate
The 9DBL0452BKILFT and 9DBL0255NLGI8 are both 3.3V zero-delay clock buffers from Renesas with fanout capability, making them functionally comparable in clock distribution applications. However, they differ in output type, channel count, and package configuration, so validation against the target design's signal integrity and board layout requirements is essential before substitution.
Output Type
Validation required
Channel Count
Validation required
Package Type
Validation required
Supply Voltage
High match
Parts at a glance
Part B
9DBL0255NLGI8
Renesas Electronics Corporation
- Lifecycle
- Active
- Stock
- 6998 PCS
- Series
- Clock-Timing - Application Specific Clock-Timing
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 9DBL0452BKILFT | 9DBL0255NLGI8 | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics | Renesas Electronics | Same manufacturer ensures consistent quality and support ecosystem. |
| Function | Clock Buffer / Fanout Buffer | Clock Buffer / Fanout Buffer | Both serve as clock distribution buffers, but differ in channel count and configuration. |
| Number of Outputs | 4 | 2 | Output count determines how many clock loads can be driven, directly affecting system fanout capability. |
| Input Type | HCSL | HCSL | Input signaling standard must match the upstream clock source for proper interfacing. |
| Output Type | HCSL | HCSL | Output signaling standard must match downstream receivers for reliable clock transmission. |
| Supply Voltage | 3.3 V | 3.3 V | Supply voltage compatibility is essential for power rail design and level matching. |
| Package / Case | 32-VFQFN Exposed Pad | 24-VFQFN Exposed Pad | Different package footprints require different PCB layouts and cannot be drop-in replaced. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Industrial temperature range ensures operation in harsh environments. |
| Mounting Type | Surface Mount | Surface Mount | Both are SMD, compatible with modern automated assembly processes. |
| Maximum Output Frequency | 400 MHz | 400 MHz | Frequency capability must meet the system clock requirements for the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 9DBL0452BKILFT | 9DBL0255NLGI8 |
|---|---|---|
| Part Status | Obsolete | Active |
| Main Purpose | PCI Express (PCIe) | PCI Express (PCIe) |
| Input | HCSL | Clock |
| Output | HCSL | LP-HCSL |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:4 | 1:2 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 200MHz | 220MHz |
| Voltage - Supply | 3.135V ~ 3.465V | 3.135V ~ 3.465V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | 9DBL0452 | 9DBL0255 |
| Digi Key Programmable | Not Verified | Not Verified |
| PLL | Yes | Yes with Bypass |
| Packaging | Tape & Reel (TR) | - |
Frequently asked questions
What are the 9DBL0452BKILFT and 9DBL0255NLGI8?
The 9DBL0452BKILFT is a Renesas 3.3V zero-delay buffer from the 9DBL04 family, and the 9DBL0255NLGI8 is a Renesas 3.3V zero-delay buffer from the 9DBL02 family. Both are clock fanout buffers intended for PCIe and similar synchronous clock distribution applications.
How do the output counts of the 9DBL0452BKILFT and 9DBL0255NLGI8 differ?
The 9DBL0452BKILFT provides 4 differential output pairs, while the 9DBL0255NLGI8 provides 2 differential output pairs. The output count is a primary selection criterion when choosing between these two devices.
Are the 9DBL0452BKILFT and 9DBL0255NLGI8 pin-to-pin compatible?
No. The 9DBL0452BKILFT and 9DBL0255NLGI8 have different output counts and different package pinouts, so they are not pin-to-pin compatible and cannot be interchanged without PCB redesign.
What package types are used by the 9DBL0452BKILFT and 9DBL0255NLGI8?
The 9DBL0452BKILFT is offered in a 32-pin VFQFPN package, and the 9DBL0255NLGI8 is offered in a 24-pin VFQFPN package. Package footprint and thermal pad dimensions differ between the two devices.
Do the 9DBL0452BKILFT and 9DBL0255NLGI8 support the same supply voltage?
Yes. Both devices operate from a 3.3V nominal supply, consistent with the 9DBL04 and 9DBL02 family specifications.
Can the 9DBL0452BKILFT and 9DBL0255NLGI8 be used in the same PCIe clock tree?
Both are zero-delay buffers suitable for PCIe clock distribution, but they are not interchangeable in the same socket. Selection depends on the required number of differential output pairs and the associated board layout.
What is the operating temperature range for the 9DBL0452BKILFT and 9DBL0255NLGI8?
Both the 9DBL0452BKILFT and 9DBL0255NLGI8 are specified for the industrial temperature range of -40°C to +85°C, as stated in their respective Renesas datasheets.
Which device should be selected when fewer differential outputs are required?
The 9DBL0255NLGI8 should be selected when only 2 differential output pairs are needed, since it provides the required output count in a smaller 24-pin package and avoids the unused outputs of the 9DBL0452BKILFT.