Part A
8535AGI-31LFT
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 3663 PCS
- Package
- TSSOP-20
- Series
- Horário-Horário - Clock Buffers, Drivers
Replacement verdict
Compatible functional replacement candidate
The 8535AGI-31LFT and 8535AG-21LF are functionally compatible clock fanout buffer ICs from the same 8535 family, sharing identical logic type, channel count, and supply voltage requirements. The primary distinction lies in the output termination style and package configuration, which may require validation depending on the target application's board layout and signal integrity requirements.
Output Type
High match
Channel Count
High match
Package Type
Validation required
Output Termination
Validation required
Parts at a glance
Part B
8535AG-21LF
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 3976 PCS
- Package
- TSSOP-14
- Series
- Horário-Horário - 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 | 8535AGI-31LFT | 853AG-21LF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Same manufacturer ensures consistent quality and support. |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) | 20-TSSOP (0.173", 4.40mm Width) | Identical package allows direct drop-in replacement on PCB. |
| Function | Clock Generator, Fanout Distribution | Clock Generator, Fanout Distribution | Same function ensures compatibility in clock distribution applications. |
| Number of Circuits | 1 | 1 | Single circuit matches system architecture requirements. |
| Input Type | LVCMOS, LVTTL, Crystal | LVCMOS, LVTTL, Crystal | Same input compatibility allows use with existing signal sources. |
| Output Type | LVCMOS, LVTTL | LVCMOS, LVTTL | Matching output levels ensure interface compatibility with downstream devices. |
| Frequency - Max | 250 MHz | 250 MHz | Same maximum frequency supports identical timing requirements. |
| Voltage - Supply | 3.135V ~ 3.465V | 3.135V ~ 3.465V | Identical supply voltage range ensures power compatibility. |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | Same temperature range allows use in identical environmental conditions. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting method ensures compatibility with assembly processes. |
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 | 8535AGI-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 | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 8535AGI-31LFT and 8535AG-21LF?
The 8535AGI-31LFT and 8535AG-21LF are both 3.3V LVPECL fanout buffers from Renesas (formerly IDT). The 8535AGI-31LFT is a 1-to-4 differential-to-LVPECL fanout buffer, while the 8535AG-21LF is a 1-to-2 differential-to-LVPECL fanout buffer. Both are members of the 8535 family of clock distribution devices.
What is the difference in output fanout between the 8535AGI-31LFT and 8535AG-21LF?
The 8535AGI-31LFT provides four LVPECL output pairs (1-to-4 fanout), whereas the 8535AG-21LF provides two LVPECL output pairs (1-to-2 fanout). This is the primary functional difference between the two devices.
Are the 8535AGI-31LFT and 8535AG-21LF pin-compatible?
No. The 8535AGI-31LFT and 8535AG-21LF are not pin-compatible. The 8535AGI-31LFT is offered in a 20-pin TSSOP package, while the 8535AG-21LF is offered in a 16-pin TSSOP package. The different pin counts and pin assignments prevent direct drop-in replacement without PCB redesign.
What is the operating supply voltage for the 8535AGI-31LFT and 8535AG-21LF?
Both the 8535AGI-31LFT and 8535AG-21LF operate from a 3.3V nominal supply voltage (VCC = 3.3V ± 5%). They are designed for 3.3V LVPECL clock distribution applications.
What is the maximum operating frequency of the 8535AGI-31LFT and 8535AG-21LF?
Both the 8535AGI-31LFT and 8535AG-21LF support a maximum output frequency of 700 MHz, making them suitable for high-speed clock distribution in applications such as networking, telecommunications, and high-performance computing.
What is the difference between the "I" and non-"I" suffix in 8535AGI-31LFT versus 8535AG-21LF?
The "I" in 8535AGI-31LFT indicates an industrial temperature range specification of -40°C to +85°C. The 8535AG-21LF, without the "I" designation, is specified for the commercial temperature range of 0°C to +70°C. This temperature grade difference affects the operating environment suitability of each device.
What package types are used for the 8535AGI-31LFT and 8535AG-21LF?
The 8535AGI-31LFT is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package). The 8535AG-21LF is packaged in a 16-pin TSSOP. Both packages are lead-free (LF suffix) and RoHS compliant.
Can the 8535AGI-31LFT and 8535AG-21LF be used interchangeably in an existing design?
No. Due to differences in output fanout (4 vs 2), package size (20-pin vs 16-pin TSSOP), pin assignments, and temperature grade (industrial vs commercial), the 8535AGI-31LFT and 8535AG-21LF are not interchangeable without circuit and layout modifications. Designers must verify compatibility against the specific application requirements and manufacturer datasheets.