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 83940DYILF and 83940DYLF are functionally equivalent clock fanout buffers from the same manufacturer, sharing identical device architecture, pin configuration, and electrical characteristics. The 83940DYILF is the lead-free (Pb-free) RoHS-compliant variant of the 83940DYLF, making it a suitable drop-in replacement in most applications where lead-free termination finish is acceptable. Designers should verify solder process compatibility and any application-specific requirements before substituting.
Function
High match
Pin Configuration
High match
Electrical Characteristics
High match
Termination Finish
Validation required
Parts at a glance
Part B
83940DYLF
Renesas Electronics, États - Unis
- Lifecycle
- Active
- Stock
- 5674 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 | 83940DYLF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics | Renesas Electronics | Same manufacturer ensures consistent design, documentation, and support. |
| Function | Clock fanout buffer / clock distribution | Clock fanout buffer / clock distribution | Identical core function is required for functional substitutability. |
| Package / Case | TSSOP-32 | TSSOP-32 | Same footprint allows drop-in replacement on an existing PCB. |
| Mounting Type | Surface Mount | Surface Mount | Matching mounting style is essential for board assembly compatibility. |
| Supply Voltage | 3.3 V | 3.3 V | Same supply voltage ensures electrical compatibility with the host system. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching temperature range ensures suitability for the same application environments. |
| Number of Outputs | 10 | 10 | Same output count preserves clock distribution capability in the design. |
| Output Type | LVCMOS / LVTTL | LVCMOS / LVTTL | Matching output logic levels ensures signal compatibility with downstream devices. |
| RoHS Status | RoHS Compliant | RoHS Compliant | Both parts meet environmental regulations for global market acceptance. |
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 | 83940DYLF |
|---|---|---|
| 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 the 83940DYILF and the 83940DYLF?
The 83940DYILF and 83940DYLF are both IDT (Integrated Device Technology, now Renesas) 83940 series clock fanout buffers. The primary difference is the suffix: the "I" in 83940DYILF denotes the industrial temperature range version, while 83940DYLF is the commercial temperature range version. Both are functionally identical clock distribution devices with the same pinout and package.
What is the operating temperature range of the 83940DYILF?
The 83940DYILF is specified for the industrial temperature range of -40°C to +85°C, as indicated by the "I" suffix in the part number. This makes it suitable for industrial and outdoor applications requiring extended temperature operation.
What is the operating temperature range of the 83940DYLF?
The 83940DYLF is specified for the commercial temperature range of 0°C to +70°C. It is intended for use in controlled-environment applications such as commercial and consumer electronics.
Are the 83940DYILF and 83940DYLF pin-to-pin compatible?
Yes. Both devices are offered in the same package and share identical pinouts. The only difference is the temperature grade rating. This means they are pin-to-pin compatible, but substitution must account for the required operating temperature range of the target application.
Can the 83940DYLF be used as a drop-in replacement for the 83940DYILF?
Functionally and pinout-wise, yes, since both share the same package and pin configuration. However, the 83940DYLF is only rated for 0°C to +70°C, so it cannot be used as a drop-in replacement in applications that require the industrial -40°C to +85°C range of the 83940DYILF. The reverse substitution (industrial part for commercial part) is generally acceptable if the higher cost is not a concern.
What is the function of the 83940 series devices?
The 83940 series are low-skew clock fanout buffers designed to distribute a single clock input to multiple outputs with minimal skew. They are used in applications such as networking, telecommunications, and computing systems where precise clock distribution is required.
Do the 83940DYILF and 83940DYLF require the same power supply voltage?
Yes. Both devices operate from the same supply voltage as specified in the 83940 series datasheet. The temperature grade suffix does not affect the electrical operating voltage requirements.
Which part number should be selected for an industrial application?
For industrial applications requiring operation over -40°C to +85°C, the 83940DYILF should be selected. The 83940DYLF is only rated for commercial temperatures (0°C to +70°C) and is not suitable for industrial temperature environments.