Part A
83940DYILF
Renesas Electronics, États - Unis
- Lifecycle
- Active
- Stock
- 3437 PCS
- Package
- LQFP-32
- Series
- Horloge Timing - clock Buffers, Drives
Replacement verdict
Compatible functional replacement candidate
The 83940DY-01LFT is a functionally compatible replacement candidate for the 83940DYILF, with matching device function, logic family, and supply voltage. However, validation is required for the output termination scheme and the operating temperature range, as the two part numbers differ in these specifications. Review the critical differences before committing to a design substitution.
Device Function
High match
Logic Family
High match
Output Type
Validation required
Operating Temperature
Validation required
Parts at a glance
Part B
83940DY-01LFT
Renesas Electronics, États - Unis
- Lifecycle
- Active
- Stock
- 9323 PCS
- Package
- LQFP-32
- 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 | 83940DYILF | 83940DY-01LFT | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Same manufacturer ensures consistent quality, documentation, and support for both parts. |
| Function / Type | Clock Fanout Buffer / Multiplexer | Clock Fanout Buffer / Multiplexer | Both devices perform the same core clock distribution function, making them candidates for substitution. |
| Package / Case | 32-LQFP (7x7) | 32-LQFP (7x7) | Identical package footprint allows drop-in replacement on the same PCB layout. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting style ensures compatibility with existing assembly processes. |
| Supply Voltage | 3.135V to 3.465V | 3.135V to 3.465V | Matching supply voltage ranges means both parts operate in the same power environment. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Same temperature range ensures both parts work in identical thermal conditions. |
| Number of Outputs | 8 | 8 | Equal output count preserves the clock fanout capability of the design. |
| Output Type | LVCMOS / LVTTL | LVCMOS / LVTTL | Same output signaling standard ensures compatibility with downstream clock inputs. |
| Input Type | LVCMOS / LVTTL / Differential | LVCMOS / LVTTL / Differential | Matching input compatibility allows the same clock source to drive either device. |
| Packaging / Ordering Suffix | Tray | Tape & Reel | Different packaging affects handling and automated assembly but not electrical function. |
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 | 83940DYILF | 83940DY-01LFT |
|---|---|---|
| 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 are the 83940DYILF and 83940DY-01LFT?
The 83940DYILF and 83940DY-01LFT are both IDT (Integrated Device Technology, now Renesas) 3.3V LVCMOS/LVTTL-to-LVDS clock fanout buffers in the 83940 family. They accept a single-ended clock input and distribute multiple low-skew LVDS outputs, and both are offered in a 32-pin TQFP package.
What is the difference between the 83940DYILF and the 83940DY-01LFT?
The 83940DYILF is the standard 83940 device, while the 83940DY-01LFT is the "-01" variant. The "-01" suffix denotes a specific device configuration or output/input default option defined by the manufacturer. The two part numbers are not interchangeable without verifying the exact configuration differences in the respective datasheets.
Do the 83940DYILF and 83940DY-01LFT have the same pinout and package?
Both devices are supplied in the same 32-pin TQFP package (the "LF" suffix indicates Pb-free/lead-free). However, because the "-01" variant may define different internal configuration or default states, the pin functions and behavior should be confirmed against the specific datasheet for each part number before treating them as pin-compatible.
Can the 83940DYILF and 83940DY-01LFT be used interchangeably in a design?
They should not be treated as drop-in replacements without validation. Although they belong to the same 83940 family and share the same package, the "-01" variant may differ in configuration, default output state, or input handling. A design review against both datasheets is required before substitution.
What supply voltage do the 83940DYILF and 83940DY-01LFT require?
Both devices operate from a 3.3V nominal supply (VCC = 3.3V ± 5%), consistent with the 83940 family specification. The core and output supply rails should be verified in the respective datasheets for the exact operating range and any separate VCC/VCCA requirements.
What is the output logic type of the 83940DYILF and 83940DY-01LFT?
Both devices provide LVDS (Low-Voltage Differential Signaling) outputs. They are designed as clock fanout buffers that convert a single-ended LVCMOS/LVTTL input clock to multiple LVDS output clocks with low output-to-output skew.
Are the 83940DYILF and 83940DY-01LFT RoHS compliant?
The "LF" suffix in both part numbers indicates lead-free (Pb-free) construction, which is associated with RoHS compliance. Final RoHS status should be confirmed from the manufacturer's or distributor's current product documentation, as compliance declarations can be updated.
What is the operating temperature range for the 83940DYILF and 83940DY-01LFT?
The "I" in the part number indicates the industrial temperature grade. The industrial range for these IDT clock devices is typically -40°C to +85°C ambient. The exact temperature specification should be verified in the respective datasheet for each part number.