Renesas 495-25-141JB4I

Overview

495-25-141JB4I from Integrated Device Technology, Inc. is a seam-sealed ceramic SMD crystal resonator operating at 25.000 MHz fundamental mode, with ±10 PPM frequency tolerance at 25°C, ±20 PPM stability over −40°C to +85°C, 40 Ω ESR, and 10 pF load capacitance - designed for precise clock reference in VCXO-based synchronization PLL systems.

For engineers reviewing the 495-25-141JB4I datasheet, 495-25-141JB4I pinout, 495-25-141JB4I application, or 495-25-141JB4I equivalent, key selection criteria include frequency accuracy under temperature variation, ESR compatibility with oscillator IC drive capability, CL matching to sustaining amplifier design, aging specification for long-term timing integrity, and MSL1 handling for lead-free reflow.

Technical Context

This 25 MHz fundamental-mode crystal is engineered for use with IDT's VCXO-based synchronization PLLs, requiring tight initial tolerance and low-temperature drift to maintain phase alignment in telecom and networking timing architectures. Its 40 Ω ESR and 10 pF CL are optimized for stable oscillation startup and low-jitter performance in buffered VCXO configurations.

The ±70 PPM pullability range (7.5–14.8 pF) enables fine frequency tuning via varactor control voltage, supporting dynamic phase adjustment in PLL lock loops. Aging of ±11 PPM over 10 years ensures long-term frequency predictability in carrier-grade infrastructure deployments.

Key Specifications

Pinout & Package

Package: 5.0 × 3.2 × 0.7 mm JB4 seam-sealed ceramic SMD package with gold termination finish (MSL1, 260°C/10s reflow compatible). No electrical pins - two-terminal passive resonator with metallized pads for anode/cathode connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar crystal resonator applications.

Compared with NDk NX3225GA-25.000M and TXC 7M-25.000MAAJ-T, the 495-25-141JB4I delivers tighter temperature stability and lower ESR specifically matched to IDT VCXO drive circuitry, enabling lower jitter and faster PLL lock in telecom timing systems - making it the preferred choice for G.8262-compliant deployments.

Availability

495-25-141JB4I is available at Aetrix Electronics and suitable for telecom infrastructure, industrial Ethernet switching, and 5G radio unit timing applications requiring stable component supply, long-lifecycle support, and MSL1 reflow compatibility.

Supply support for 495-25-141JB4I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology, Inc. (IDT) is a fabless semiconductor company specializing in timing, memory interface, RF, and real-time interconnect solutions for communications, computing, and industrial markets.

The 495-25-141JB4I belongs to IDT's precision SMD crystal portfolio, developed explicitly to support their family of VCXO-based synchronization PLLs used in carrier-grade timing equipment and packet network elements.

FAQ

What is the operating temperature range for the 495-25-141JB4I?

The 495-25-141JB4I operates from −40°C to +85°C, matching the extended industrial temperature grade required for telecom line cards and outdoor radio units. This range is validated per the datasheet's TOPR specification and confirmed by thermal cycling tests performed during qualification. The same range applies to storage conditions, ensuring no parametric shift during logistics or shelf storage before assembly.

Is the 495-25-141JB4I compatible with lead-free reflow processes?

Yes, the 495-25-141JB4I is rated MSL1 and qualified for peak reflow temperatures up to 260°C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020. Its gold termination finish and seam-sealed ceramic body prevent intermetallic growth or moisture-related cracking during standard lead-free soldering profiles used in high-volume PCB assembly lines.

Does the 495-25-141JB4I require external load capacitors?

Yes, the 495-25-141JB4I specifies a 10 pF load capacitance (CL), meaning external capacitors must be placed between each terminal and ground to achieve nominal 25.000 MHz resonance. The exact values depend on PCB stray capacitance and oscillator IC input capacitance, typically requiring two 18–22 pF NP0/C0G capacitors in series configuration per standard Pierce oscillator design rules.

What is the aging specification for the 495-25-141JB4I over its lifetime?

The 495-25-141JB4I exhibits ±11 PPM aging over 10 years at +25°C, measured under controlled environmental conditions per IEC 60679-1. This value reflects long-term frequency drift due to material stress relaxation and electrode migration, and is factored into holdover timing budgets for SyncE and PTP applications where GPS-disciplined clocks may be temporarily unavailable.

Can the 495-25-141JB4I be used with non-IDT oscillator ICs?

The 495-25-141JB4I can be used with non-IDT oscillator ICs if their drive level, ESR tolerance, and CL requirements align - e.g., devices specifying ≤0.5 mW drive level, ≥35 Ω ESR support, and 10 pF CL. However, its pullability and stability specs are tuned for IDT VCXOs; third-party ICs may require validation of startup time, jitter, and temperature hysteresis using the 495-25-141JB4I.