Part A
83940DYILF
ルネサス エレクトロニクス アメリカ株式会社
- Lifecycle
- Active
- Stock
- 3437 個数
- Package
- LQFP-32
- 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 83940DYILF and 83940DYLFT are functionally equivalent clock fanout buffers from the same manufacturer, sharing identical device specifications. The only distinction is the packing method, making them interchangeable for design and qualification purposes. The 83940DYLFT is a valid drop-in replacement candidate for the 83940DYILF.
Function
High match
Package Type
High match
Pin Configuration
High match
Electrical Specifications
High match
Parts at a glance
Part B
83940DYLFT
ルネサス エレクトロニクス アメリカ株式会社
- Lifecycle
- Active
- Stock
- 3166 個数
- Package
- LQFP-32
- 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 | 83940DYILF | 83940DYLFT | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Identifies the original source of the device and ensures documentation and support come from the same vendor. |
| Function | Clock Fanout Buffer / Multiplexer | Clock Fanout Buffer / Multiplexer | Confirms both parts perform the same core signal distribution function, which is essential for functional substitutability. |
| Package / Case | 32-LQFP (7x7) | 32-LQFP (7x7) | Matching footprint and lead pitch allow drop-in replacement on the same PCB without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method must match to be compatible with the existing board manufacturing process. |
| Supply Voltage | 3.135 V to 3.465 V | 3.135 V to 3.465 V | Operating voltage range must be compatible with the system power rail to avoid damage or unreliable operation. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Temperature range determines suitability for industrial versus commercial environments. |
| Number of Outputs | 8 | 8 | Output count must match to drive the same number of downstream clock loads. |
| Output Type | LVCMOS / LVTTL | LVCMOS / LVTTL | Logic level compatibility ensures the buffer can interface with the same receiving devices. |
| Packaging | Tray | Tape & Reel | Different packaging affects handling and assembly line feed method, though the die and performance are identical. |
| RoHS Status | RoHS Compliant | RoHS Compliant | Environmental compliance is required for sale and use in many regions and applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 83940DYILF | 83940DYLFT |
|---|---|---|
| Supplier | - | Renesas Electronics America Inc |
| Part Status | Obsolete | Obsolete |
| Type | Fanout Buffer (Distribution), Multiplexer | Fanout Buffer (Distribution), Multiplexer |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 2:18 | 2:18 |
| Differential - Input: Output | Yes/No | Yes/No |
| Input | CML, LVCMOS, LVPECL, LVTTL, SSTL | CML, LVCMOS, LVPECL, LVTTL, SSTL |
| Output | LVCMOS, LVTTL | LVCMOS, LVTTL |
| Frequency - Max | 250 MHz | 250 MHz |
| Voltage - Supply | 2.375V ~ 3.465V | 2.375V ~ 3.465V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between 83940DYILF and 83940DYLFT?
The 83940DYILF and 83940DYLFT are ordering part numbers for the same Renesas (formerly IDT) 83940D device, a 3.3V LVCMOS/LVTTL-to-LVPECL clock fanout buffer. The suffix difference reflects packaging and shipping format rather than electrical function. The "T" suffix on 83940DYLFT indicates tape-and-reel packaging, while 83940DYILF is supplied in tubes. Both share the same die, pinout, and specified performance.
Are 83940DYILF and 83940DYLFT electrically interchangeable?
Yes. Because both part numbers refer to the same 83940D silicon and the same package type, they are electrically and functionally interchangeable. The only difference is the shipping medium (tube vs. tape-and-reel), which does not affect device operation, pinout, or datasheet specifications.
What is the function of the 83940D device?
The 83940D is a 3.3V clock fanout buffer that accepts LVCMOS or LVTTL input and provides LVPECL outputs. It is used to distribute a single clock source to multiple destinations while maintaining low skew and jitter, making it suitable for networking, computing, and industrial timing applications.
What package do 83940DYILF and 83940DYLFT use?
Both 83940DYILF and 83940DYLFT are offered in the same package type as defined by the 83940D datasheet. The "Y" in the ordering code designates the package family, and the "LF" indicates lead-free (RoHS-compliant) construction. Designers should confirm the exact package drawing and land pattern from the official Renesas 83940D datasheet before layout.
Can 83940DYILF and 83940DYLFT be used in the same PCB footprint?
Yes. Since both ordering codes correspond to the same 83940D device in the same package, they share an identical pinout and footprint. A board designed for one can accept the other without layout changes, provided the assembly process supports the respective shipping format.
Which part number should be selected for automated assembly?
For automated pick-and-place assembly, 83940DYLFT (tape-and-reel) is generally preferred because tape-and-reel packaging is compatible with high-speed SMT feeders. 83940DYILF (tube) is typically used for manual assembly, prototyping, or low-volume production. Selection depends on the assembly method, not on device performance.
Do 83940DYILF and 83940DYLFT differ in operating temperature range?
No. Both ordering codes refer to the same 83940D device and therefore share the same specified operating temperature range as stated in the Renesas 83940D datasheet. The "I" in the ordering code denotes the industrial temperature grade, which applies to both part numbers.
Are 83940DYILF and 83940DYLFT RoHS compliant?
Yes. The "LF" suffix in both 83940DYILF and 83940DYLFT indicates lead-free, RoHS-compliant construction. Both part numbers meet the same environmental compliance requirements as specified by the manufacturer.