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Renesas 495-25-141JB4I8
- Part No.:
- 495-25-141JB4I8
- Manufacturer:
- Renesas
- Category:
- Crystals
- Package:
- 4-SMD, No Lead
- Datasheet:
-
495-25-141JB4I8.pdf
- Description:
- CRYSTAL 25.0000MHZ 10PF SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,313
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Product details
Overview
495-25-141JB4I8 from Integrated Device Technology (IDT) 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, and 40 Ω equivalent series resistance (ESR), designed for use with IDT's VCXO-based synchronization PLLs in telecom timing systems.
For engineers reviewing the 495-25-141JB4I8 datasheet, 495-25-141JB4I8 pinout, 495-25-141JB4I8 application, or 495-25-141JB4I8 equivalent, key selection considerations include load capacitance (10 pF), pullability range (±70 PPM over 7.5–14.8 pF), aging (±11 PPM over 10 years), ESR (40 Ω), and MSL1 handling compatibility.
Technical Context
This crystal is specified for fundamental-mode resonance and requires external load capacitance of 10 pF to achieve nominal 25.000 MHz output. Its ±70 PPM pullability supports fine frequency adjustment when used with voltage-controlled oscillator (VCXO) circuits in phase-locked loop (PLL) synchronization architectures.
The JB4 package (5.0 × 3.2 × 0.7 mm) features gold termination, MSL1 rating, and is qualified for reflow up to 260°C/10 s. It exhibits 7.0 pF shunt capacitance and 0.2 mW maximum drive level - critical for sustaining stable oscillation without activity dip or premature aging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency | 25.000 MHz - precise reference for synchronization PLLs requiring stable base clock input. |
| Frequency Tolerance @ 25°C | ±10 PPM - ensures initial accuracy within 0.25 Hz deviation at room temperature. |
| Frequency Stability | ±20 PPM over –40°C to +85°C - guarantees bounded drift across industrial temperature range. |
| Load Capacitance (CL) | 10 pF - defines required external capacitor value for accurate frequency calibration. |
| Equivalent Series Resistance (ESR) | 40 Ω - low impedance enables reliable start-up and low-phase-noise operation with standard oscillator ICs. |
| Pullability | ±70 PPM over 7.5–14.8 pF - supports VCXO tuning range when paired with IDT's synchronization PLLs. |
| Aging (10 years) | ±11 PPM - long-term frequency drift specification critical for infrastructure equipment lifetime validation. |
Pinout & Package
Package: JB4 - 5.0 mm × 3.2 mm × 0.7 mm ceramic SMD seam-sealed surface-mount package with gold-plated terminations and MSL1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Crystal Electrode (Anode-side) | Connects to oscillator IC's XIN or XTAL input; polarity not applicable but orientation affects board layout symmetry. |
| Terminal 2 | Crystal Electrode (Cathode-side) | Connects to oscillator IC's XOUT or ground-referenced node; forms resonant tank with CL network. |
Key Features
| Feature | Design Value |
|---|---|
| Fundamental-mode resonance | Enables direct 25 MHz operation without overtone filtering complexity or spurious mode risk. |
| Seam-sealed ceramic construction | Provides hermetic reliability and long-term stability under thermal cycling and humidity exposure. |
| Low 40 Ω ESR | Reduces power dissipation and improves margin against negative resistance failure in CMOS oscillator circuits. |
| ±70 PPM pullability range | Supports full frequency adjustment capability required by IDT's VCXO-based sync PLL reference designs. |
| MSL1 rating & Au finish | Permits single-reflow assembly without baking; eliminates solderability degradation during storage or handling. |
Applications
| Telecom Line Card Timing | SyncE Equipment Clocking |
|---|---|
Use Scenario: Precision clock source for Ethernet Synchronous Equipment (SyncE) line cards in carrier-grade routers and switches. IC Role / Device Role / Timing Role: Reference crystal for IDT's 8T49N28x family VCXO-PLLs generating SyncE-compliant EEC Option 1/2 clocks. Use Value: ±20 PPM stability and ±10 PPM initial tolerance meet ITU-T G.8262 EEC-2 requirements for wander and jitter accumulation control. | Use Scenario: Primary frequency reference in packet-optical transport platforms requiring traceable stratum-3E timing. IC Role / Device Role / Timing Role: Fundamental-mode resonator enabling low-jitter VCXO synthesis in IDT 5P49V5901-based timing cards. Use Value: 40 Ω ESR and 10 pF CL ensure robust oscillation margin with high-gain oscillator ICs under wide temperature variation. |
| Industrial Ethernet Switches | 5G Fronthaul Timing Modules |
Use Scenario: Timing reference for IEEE 1588 PTP grandmaster clocks in factory automation switches. IC Role / Device Role / Timing Role: Stable 25 MHz base oscillator for IDT 5P49V60/5P49V69 programmable timing devices. Use Value: ±11 PPM 10-year aging supports long-life deployment without field recalibration or replacement. | Use Scenario: Frequency control element in CPRI/eCPRI fronthaul timing modules requiring tight phase alignment. IC Role / Device Role / Timing Role: Tunable crystal for VCXO loops in IDT 8A3400x timing ICs delivering sub-100 fs RMS jitter. Use Value: ±70 PPM pullability enables closed-loop compensation of temperature-induced drift in outdoor small-cell deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar crystal resonator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NDK NX3225GA-25.000M | Same 25 MHz, 10 pF CL, ±10 PPM tol, but 50 Ω ESR and ±15 PPM stability over –40°C to +85°C. | Suitable for general-purpose MCU clocks; less optimized for VCXO pull range and telecom-grade aging. | Select when lower cost or broader distributor availability is prioritized over telecom-specific stability and pullability. |
| TXC 7M-25.000MAAJ-T | 25 MHz, 12 pF CL, ±10 PPM tol, 60 Ω ESR, ±25 PPM stability, no published pullability spec. | Targeted at consumer/computing applications; lacks documented VCXO tuning support and telecom aging data. | Choose only for non-critical timing where ±25 PPM stability and absence of pullability verification are acceptable. |
Compared with NDk NX3225GA-25.000M and TXC 7M-25.000MAAJ-T, the 495-25-141JB4I8 delivers tighter ±20 PPM stability, verified ±70 PPM pullability, and telecom-qualified 10-year aging - making it uniquely suited for IDT VCXO-PLL synchronization in infrastructure-grade timing systems.
Availability
495-25-141JB4I8 is available at Aetrix Electronics and suitable for telecom line card timing, SyncE equipment clocking, and 5G fronthaul timing modules requiring stable component supply with guaranteed long-lifecycle support.
Supply support for 495-25-141JB4I8 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 (IDT) is a fabless semiconductor company specializing in timing, memory interface, RF, and power management solutions, acquired by Renesas Electronics in 2019.
The 495-25-141 series belongs to IDT's precision crystal portfolio engineered specifically for synchronization PLL applications - emphasizing low ESR, controlled pullability, and telecom-grade aging performance.
FAQ
What is the load capacitance requirement for the 495-25-141JB4I8?
The 495-25-141JB4I8 requires a 10 pF load capacitance (CL) to operate at its nominal 25.000 MHz frequency. This value must be implemented using external capacitors matching the oscillator IC's configuration, and deviations directly impact frequency accuracy. The 495-25-141JB4I8 datasheet specifies CL = 10 pF as a fixed design parameter, not a range.
Is the 495-25-141JB4I8 compatible with standard reflow processes?
Yes, the 495-25-141JB4I8 is rated for lead-free reflow with a maximum soldering temperature of 260°C for 10 seconds and carries Moisture Sensitivity Level (MSL) 1 - meaning it can be stored indefinitely at ambient conditions without baking prior to assembly. Its gold termination ensures consistent wetting and joint integrity.
Does the 495-25-141JB4I8 support voltage-controlled frequency tuning?
The 495-25-141JB4I8 itself is a passive crystal, but it is explicitly characterized for use in VCXO circuits: its ±70 PPM pullability over 7.5–14.8 pF enables voltage-controlled tuning when paired with appropriate varactor diodes and IDT's VCXO-based PLLs. The 495-25-141JB4I8 does not contain active circuitry.
What is the aging specification for the 495-25-141JB4I8 over 10 years?
The 495-25-141JB4I8 has a maximum aging specification of ±11 PPM over 10 years at +25°C, as confirmed in the official IDT datasheet revision A (03/24/15). This value reflects cumulative frequency drift due to material stress relaxation and is measured under controlled shelf-storage conditions.
Can the 495-25-141JB4I8 replace the 495-25-141JB4I in a design?
Yes - the 495-25-141JB4I8 differs from 495-25-141JB4I only in packaging format (Tape and Reel vs. Cut-Tape); all electrical, mechanical, and reliability specifications including frequency, tolerance, stability, ESR, and aging are identical. No design or layout changes are needed when substituting 495-25-141JB4I8 for 495-25-141JB4I.
495-25-141JB4I8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 4-SMD, No Lead
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- MHz Crystal
- Frequency:
- 25 MHz
- Frequency Stability:
- ±20ppm
- Frequency Tolerance:
- ±10ppm
- Load Capacitance:
- 10pF
- ESR (Equivalent Series Resistance):
- 40 Ohms
- Operating Mode:
- Fundamental
- Operating Temperature:
- -40°C ~ 85°C
- Ratings:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
- Size / Dimension:
- 0.197" L x 0.126" W (5.00mm x 3.20mm)
- Height - Seated (Max):
- -
495-25-141JB4I8 FAQ
1.How can I place an order for 495-25-141JB4I8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 495-25-141JB4I8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 495-25-141JB4I8 reliable?
The price and inventory of 495-25-141JB4I8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 495-25-141JB4I8 is usually 5 days.
3.What payment methods are accepted for 495-25-141JB4I8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 495-25-141JB4I8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 495-25-141JB4I8?
495-25-141JB4I8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 495-25-141JB4I8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 495-25-141JB4I8?
For technical support, including 495-25-141JB4I8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 495-25-141JB4I8 requirements.
6.How does Aetrix verify that 495-25-141JB4I8 is sourced from the original manufacturer or authorized distributors?
All 495-25-141JB4I8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 495-25-141JB4I8 meets industry standards.
7.What is the process for return or replacement of 495-25-141JB4I8?
All 495-25-141JB4I8 units undergo pre-shipment inspection (PSI). If there is an issue with 495-25-141JB4I8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 495-25-141JB4I8 part is unused and in its original packaging.
Return procedure for 495-25-141JB4I8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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