9FGL0841BKILFT - 8-Output 3.3V PCIe Gen 1-6 Clock Generator | Renesas
MPN: 9FGL0841BKILFT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.98 | $49.80 |
| 100 | $4.21 | $421.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.12 | $3,120.00 |
| 2,500 | $2.74 | $6,850.00 |
9FGL0841BKILFT Overview
A clock generator is a semiconductor device that produces one or more precise reference timing signals used to synchronize data transfers between digital subsystems. Within the broader hierarchy of timing components, this part falls under clock generators -> timing ICs -> clock & timing -> analog/mixed-signal ICs -> semiconductors. PCIe clock generators specifically deliver the low-jitter, 100 MHz HCSL reference clocks mandated by the PCI Express specification for root complexes, endpoints, switches, retimers, and NVMe storage controllers. The 9FGL0841 family also supports PCIe Gen 1 through Gen 6 signaling speeds, making it suitable for the newest server, storage, and workstation platforms.
Key specifications include 3.3V core supply operation, 25 MHz crystal or differential reference input, eight HCSL outputs with 100 Ohm differential impedance, integrated 100 Ohm output terminations, dedicated output-enable pins, and selectable spread-spectrum profiles. Each output can be independently enabled or disabled through its OE# pin, simplifying power management in platforms that need to clock only the PCIe slots or devices currently in use. The part is rated for industrial temperature operation and supports reflow soldering compatible with standard lead-free assembly profiles.
The 9FGL0841 architecture is built around an internal PLL that locks the 25 MHz reference to a 100 MHz output, distributing the resulting low-jitter clock through eight individually-buffered HCSL output stages. Spread-spectrum modulation is applied at the PLL level to reduce EMI in dense chassis designs. This design approach delivers sub-picosecond RMS jitter and tight frequency tolerance required by PCIe Gen 5/6 CEM and base-spec compliance masks.
Typical applications include servers and high-performance computing platforms, NVMe SSD storage arrays, networking switches and routers, workstation motherboards, and embedded computing boards with PCIe expansion. The 48-pin VFQFPN 6x6 mm package provides good thermal performance and is pin-compatible with the wider 9FGL02x1 / 9FGL04x1 / 9FGL06x1 family for design reuse. The 9FGL0841BKILFT is delivered on tape-and-reel in 2500-unit reels, and an industrial-temperature (-40C to +85C) version supports harsh-environment deployments. Always confirm PCIe hosting with the latest PCI-SIG compliance checklist before production release.
When designing with this part, place the 25 MHz crystal within 5 mm of the REF_IN pins and route the HCSL outputs as 100 Ohm differential pairs with reference-plane continuity for jitter control. Series decoupling on each supply pin is required, and the unused OE# pins must be pulled to a defined logic level to prevent floating-input oscillation.
This page consolidates distributor pricing, drop-in alternatives, application notes, and PCB layout guidance that go beyond the manufacturer datasheet - a unique value summary not typically found on DigiKey, Mouser, or Octopart.
Drop-in alternatives for 9FGL0841BKILFT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with 9FGL0841BKILFT (same form factor and footprint) — differing in Number of Outputs, Package, Output Type, Spread Spectrum, Output Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
9FGL0851BKILFT
✅ Drop-In📋 Reference alternative (not in catalog)
9FGL0841BKILF
✅ Drop-In📋 Reference alternative (not in catalog)
9FGL0841AKILFT
✅ Drop-In📋 Reference alternative (not in catalog)
9FGL0451CKILF
✅ Drop-In📋 Reference alternative (not in catalog)
9FGL0851BKILF
✅ Drop-In📋 Reference alternative (not in catalog)
9DML0451AKILFT
✅ Drop-In✓ In Stock
$2.72 / Unit
View Datasheet →9FGL0841BKILFT Specifications
| Product Type | PCI Express Clock Generator |
| Series | 9FGL0841 |
| Number of Outputs | 8 (HCSL) |
| Output Frequency | 100 MHz |
| Output Type | HCSL (100 Ohm differential) |
| Input Type | Crystal or differential reference, 25 MHz |
| Supply Voltage | 3.3 V |
| PCIe Generation Support | Gen 1, Gen 2, Gen 3, Gen 4, Gen 5, Gen 6 |
| PCIe Architecture Support | CC, SRNS, SRIS |
| Spread Spectrum | Two selectable levels plus off |
| Output Enable | Dedicated OE# per output (8 pins) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 48-VFQFPN (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
9FGL0841BKILFT Pin Configuration
| Pin 1 | REF_IN — 25 MHz reference crystal input / differential reference positive |
| Pin 2 | REF_IN# — Differential reference negative / crystal return |
| Pin 3 | VDD_REF — 3.3V supply for reference input buffer |
| Pin 4 | GND — Ground |
| Pin 5 | SDA — I2C serial data (programming interface) |
| Pin 6 | SCL — I2C serial clock (programming interface) |
| Pin 7 | ADDR — I2C address select |
| Pin 8 | OE0# — Output enable for CLK0 (active low) |
| Pin 9 | CLK0 — HCSL output 0 positive |
| Pin 10 | CLK0# — HCSL output 0 negative |
| Pin 11 | OE1# — Output enable for CLK1 (active low) |
| Pin 12 | CLK1 — HCSL output 1 positive |
| Pin 13 | CLK1# — HCSL output 1 negative |
| Pin 14 | OE2# — Output enable for CLK2 (active low) |
| Pin 15 | CLK2 — HCSL output 2 positive |
| Pin 16 | CLK2# — HCSL output 2 negative |
| Pin 17 | OE3# — Output enable for CLK3 (active low) |
| Pin 18 | CLK3 — HCSL output 3 positive |
| Pin 19 | CLK3# — HCSL output 3 negative |
| Pin 20 | VDD — 3.3V core supply |
| Pin 21 | GND — Ground |
| Pin 22 | OE4# — Output enable for CLK4 (active low) |
| Pin 23 | CLK4 — HCSL output 4 positive |
| Pin 24 | CLK4# — HCSL output 4 negative |
| Pin 25 | OE5# — Output enable for CLK5 (active low) |
| Pin 26 | CLK5 — HCSL output 5 positive |
| Pin 27 | CLK5# — HCSL output 5 negative |
| Pin 28 | OE6# — Output enable for CLK6 (active low) |
| Pin 29 | CLK6 — HCSL output 6 positive |
| Pin 30 | CLK6# — HCSL output 6 negative |
| Pin 31 | VDD — 3.3V core supply |
| Pin 32 | GND — Ground |
| Pin 33 | OE7# — Output enable for CLK7 (active low) |
| Pin 34 | CLK7 — HCSL output 7 positive |
| Pin 35 | CLK7# — HCSL output 7 negative |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | FS — Frequency select / spread spectrum control |
| Pin 38 | SS_EN — Spread spectrum enable |
| Pin 39 | VDD — 3.3V core supply |
| Pin 40 | GND — Ground |
| Pin 41 | TEST — Factory test pin (float or ground per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
9FGL0841BKILFT is suitable for 6 applications: Server and High-Performance Computing Platforms, NVMe SSD Storage Arrays, Networking Switches and Routers, Workstation Motherboards, Embedded Computing Boards with PCIe Expansion, Test and Measurement Instrumentation.
Server and High-Performance Computing Platforms
The 9FGL0841BKILFT delivers eight 100 MHz HCSL reference clocks mandated by PCIe base spec for server CPUs, PCHPUs, and PCIe slots. Its eight independently-controlled OE# pins let the platform turn off clocks to unpopulated slots, reducing platform power. With sub-picosecond RMS jitter and PCIe Gen 1-5 compliance, the part meets Gen 5 CEM jitter masks used in mainstream dual-socket and single-socket server motherboards.
Recommended
NVMe SSD Storage Arrays
NVMe controllers and PCIe switches in SSD enclosures need multiple 100 MHz HCSL reference clocks with CLKREQ# support. The 9FGL0841BKILFT provides eight HCSL outputs, each with a dedicated OE# pin implementing PCIe CLKREQ#, so individual drives can be power-gated. Industrial temperature rating (-40C to +85C) suits dense NVMe array chassis where ambient temperatures can rise significantly under sustained workloads.
Recommended
Networking Switches and Routers
Networking line cards with multiple PCIe-facing ASICs require clean 100 MHz reference clocks with low jitter to support high-speed SerDes. The 9FGL0841BKILFT's HCSL outputs at 100 MHz with 100 Ohm differential impedance match PCIe ODD for SerDes reference inputs. Spread-spectrum modulation reduces EMI in dense multi-line-card chassis where multiple clock sources could otherwise create beat-frequency interference.
Recommended
Workstation Motherboards
High-end workstation boards targeting Gen 4/5 PCIe slots, multi-GPU configurations, and NVMe M.2 arrays benefit from the 9FGL0841BKILFT's eight 100 MHz HCSL outputs. Each output supports independent CLKREQ# power management so unused slots can be clock-gated. The 48-VFQFPN 6x6 mm footprint fits standard workstation board layouts and shares pinout with the wider 9FGL family for design reuse.
Recommended
Embedded Computing Boards with PCIe Expansion
Industrial single-board computers and COM Express modules often expose one or two PCIe x1/x4 links to carrier boards. The 9FGL0841BKILFT supplies eight low-jitter 100 MHz HCSL clocks from a single 3.3V rail, simplifying power-tree design. The industrial -40C to +85C temperature range supports harsh-environment deployments such as factory automation, transportation, and outdoor edge-compute installations.
Recommended
Test and Measurement Instrumentation
PCIe-based protocol analyzers, compliance test cards, and BERT equipment need clean 100 MHz reference clocks that match the device under test. The 9FGL0841BKILFT provides eight matched HCSL outputs from one 25 MHz reference, ensuring channel-to-channel skew stays within tight PCIe jitter budgets. Spread spectrum can be disabled for compliance testing where a pure tone is required for accurate jitter decomposition.
Recommended
Recommended Products Summary
Engineering reference data for 9FGL0841BKILFT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 9FGL0851BKILFT | 9FGL0841BKILF | 9FGL0841AKILFT | 9FGL0451CKILF | 9FGL0851BKILF | 9DML0451AKILFT |
|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 48-VFQFPN (6x6 mm) | 48-VFQFPN (6x6 mm) - same | 48-VFQFPN (6x6 mm) - same | 48-VFQFPN (6x6 mm) - same | 48-VFQFPN (6x6 mm) - same | 48-VFQFPN (6x6 mm) - same | 48-VFQFPN (6x6 mm) - same |
| Number of Outputs | 8 HCSL | 8 HCSL | 8 HCSL | 8 HCSL | 4 HCSL | 8 HCSL | 4 (mux/buffer) |
| PCIe Generation Support | Gen 1-6 | Gen 1-6 (Gen 6 enhanced jitter) | Gen 1-6 | Gen 1-5 | Gen 1-5 | Gen 1-6 (Gen 6 enhanced jitter) | Gen 1-5 |
| Output Frequency | 100 MHz HCSL | 100 MHz HCSL | 100 MHz HCSL | 100 MHz HCSL | 100 MHz HCSL | 100 MHz HCSL | 100 MHz HCSL |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Dedicated OE# Pins | 8 (one per output) | 8 (one per output) | 8 (one per output) | 8 (one per output) | 4 (one per output) | 8 (one per output) | 4 (one per output) |
| Packaging Media | Tape & Reel (2500) | Tape & Reel (2500) | Tray | Tape & Reel | Tray | Tray | Tape & Reel |
| Lifecycle Status | Obsolete | Active (recommended replacement) | Obsolete | Obsolete | Obsolete | Active | Active |
Key Differentiators
- Eight independently controlled HCSL outputs in a compact 48-VFQFPN 6x6 mm (vs 9FGL0451CKILF (4-output version))
- Pin-compatible upgrade path to PCIe Gen 6 jitter margin (vs 9FGL0851BKILFT)
- Supports CC, SRNS, and SRIS reference architectures in one device (vs Generic PCIe clock generators)
Design Notes
Route each HCSL output as a 100 Ohm differential pair with continuous reference plane below the trace. Keep trace length matching within 5 mils (0.13 mm) between the positive and negative legs of each pair to preserve duty cycle. Series-resistor placement right at the driver pin (typically 33 Ohm each leg) helps damp reflections and meets PCIe base-spec impedance profiles.
Decouple each VDD pin with a 0.1 uF X7R ceramic capacitor placed within 2 mm of the pin, plus a bulk 10 uF tantalum or ceramic capacitor on the 3.3V rail. Separate analog and digital ground planes are not required for this device but keep the exposed thermal pad soldered to a continuous ground pour for thermal dissipation.
Always tie unused OE# pins to a defined logic level (either pulled high through 10 kOhm or left to the platform controller) - floating OE# inputs can cause output oscillation and excess power consumption. When spread spectrum is enabled, disable it for PCIe compliance testing where a pure tone is required for accurate jitter decomposition.
Compliance Information
RoHS and lead-free per Renesas product page. AEC-Q100 not applicable - this is a commercial/industrial PCIe clock generator, not an automotive-grade part.
