Part A
8535AG-31LFT
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 1316 Stückzahl
- Package
- TSSOP-20
- Series
- Clock-Timing, Clock Buffers, Drivers
Replacement verdict
Compatible functional replacement candidate
The 8535AG-31LFT and 8535AG-21LF are functionally compatible clock fanout buffers from the same series, sharing identical supply voltage, output type, and package footprint. The primary distinction is the output-to-input skew characteristic, which requires validation against the target application's timing budget before substitution.
Output Type
High match
Package Type
High match
Supply Voltage
High match
Output Skew
Validation required
Parts at a glance
Part B
8535AG-21LF
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 3976 Stückzahl
- Package
- TSSOP-14
- Series
- Clock-Timing, Clock Buffers, Drivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 8535AG-31LFT | 8535AG-21LF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics | Renesas Electronics | Identical manufacturer ensures consistent quality, support, and documentation. |
| Function | Clock generator / fanout buffer | Clock generator / fanout buffer | Same core function is required for direct substitutability in a clock tree. |
| Input Type | Crystal / LVCMOS | Crystal / LVCMOS | Matching input compatibility allows the same reference source to drive either device. |
| Output Type | LVCMOS | LVCMOS | Same output logic family ensures downstream receivers remain compatible. |
| Number of Outputs | 4 | 4 | Equal output count preserves the fanout budget of the design. |
| Supply Voltage | 3.3 V | 3.3 V | Same supply rail allows drop-in replacement without power redesign. |
| Package | TSSOP-20 | TSSOP-20 | Identical footprint enables direct PCB substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature range ensures both parts suit the same application environments. |
| Mounting Type | Surface mount | Surface mount | Same mounting method is required for assembly compatibility. |
| Packaging | Tape & Reel | Tape & Reel | Same packaging supports identical automated pick-and-place production flow. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 8535AG-31LFT | 8535AG-21LF |
|---|---|---|
| Supplier | - | Renesas Electronics America Inc |
| Part Status | Active | Obsolete |
| Type | Fanout Buffer (Distribution), Multiplexer | Fanout Buffer (Distribution), Multiplexer |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 2:4 | 2:2 |
| 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 | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 8535AG-31LFT and 8535AG-21LF?
The 8535AG-31LFT and 8535AG-21LF are both 3.3V, 1-to-4 differential-to-LVCMOS/LVTTL clock fanout buffers from Renesas (formerly IDT). They accept a differential clock input and distribute four low-skew outputs, and both are offered in a 20-pin TSSOP package.
What is the main difference between the 8535AG-31LFT and 8535AG-21LF?
The primary difference is the output enable/disable logic and the associated pin function. The 8535AG-31LFT uses a single output enable (OE) control, while the 8535AG-21LF provides separate output enable controls for the output banks, allowing more granular control of the four outputs.
Are the 8535AG-31LFT and 8535AG-21LF pin-to-pin compatible?
No. Although both devices share the same 20-pin TSSOP footprint, the pin functions differ due to the different output enable configurations. The 8535AG-31LFT and 8535AG-21LF are not direct pin-to-pin replacements without verifying the enable pin assignments against the respective datasheets.
What is the operating supply voltage for these devices?
Both the 8535AG-31LFT and 8535AG-21LF operate from a 3.3V nominal supply, with a specified operating range of 3.135V to 3.465V, as defined in the Renesas 8535 datasheet.
What is the maximum output frequency of the 8535AG-31LFT and 8535AG-21LF?
Both devices support output frequencies up to 250 MHz, making them suitable for high-speed clock distribution in networking, computing, and industrial applications.
What output type do the 8535AG-31LFT and 8535AG-21LF provide?
Both devices provide LVCMOS/LVTTL outputs. Each of the four outputs can drive standard LVCMOS or LVTTL logic levels, and the outputs are designed for low skew and low jitter clock distribution.
Can the 8535AG-31LFT and 8535AG-21LF be used interchangeably in an existing design?
Not without design review. Because the output enable logic and pin functions differ, substituting one for the other may require changes to the control signal routing and PCB layout. The target design must be validated against the specific device datasheet before substitution.
What package do the 8535AG-31LFT and 8535AG-21LF use?
Both devices are available in a 20-pin TSSOP package. The package dimensions and land pattern are the same, but the pin functions differ between the two part numbers.