25 MHz ±30ppm Crystal 18pF SMD (TXC 8Z25020002)

Part Overview

The TXC 8Z25020002 is a 25 MHz fundamental mode quartz crystal oscillator in 4-SMD surface mount package with no lead configuration. This component operates across the industrial temperature range of -40°C to 85°C with ±30ppm frequency stability and 18pF load capacitance. The part is RoHS compliant, REACH unaffected, and classified as EAR99 for export control purposes. As an active product with 1024 pieces in stock, equivalent and substitute parts are identified to support design flexibility, procurement continuity, and supply chain optimization.

Substiute Parts

8Z25020002

TXC CORPORATIONIn Stock: 10838Z25020002 Datasheet

Current PartRFQ

8Q-25.000MAHI-T

FTSIn Stock: 36718Q-25.000MAHI-T Datasheet

SimilarRFQ

FW2500039Q

Diodes IncorporatedIn Stock: 5972FW2500039Q Datasheet

SimilarRFQ

QT252S-25.000MAHJ-T

QSTIn Stock: 5856QT252S-25.000MAHJ-T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TXC 8Z25020002 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 25 MHz (exact match required)
• Frequency Stability: ±30ppm (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -40°C to 85°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Allowable Variation Parameters:

• Load Capacitance: 16pF to 18pF (within circuit design tolerance)
• ESR (Equivalent Series Resistance): 80 to 100 Ohms (within circuit design tolerance)
• Physical Dimensions: Minor variations permitted if footprint compatibility is maintained
• RoHS/REACH Compliance: Equivalent or higher compliance level acceptable

Three substitute parts meet these criteria and are grouped as follows:

Group 1 - Direct Parametric Equivalents (Identical Load Capacitance and ESR):

• QT252S-25.000MAHJ-T (QST)

Group 2 - Load Capacitance Variant (16pF vs. 18pF):

• 8Q-25.000MAHI-T (FTS)

Group 3 - ESR Variant (80 Ohms vs. 100 Ohms):

• FW2500039Q (Diodes Incorporated)

Parameter Comparison

Engineering Selection Recommendations

QT252S-25.000MAHJ-T (QST) - Recommended Primary Substitute

This part is a direct parametric equivalent to the TXC 8Z25020002. It matches all critical specifications including 25 MHz frequency, ±30ppm stability, 18pF load capacitance, 100 Ohms ESR, and identical physical dimensions (2.50 x 2.00 mm). Both parts are RoHS compliant with MSL 1 rating. The QST part carries ROHS3 compliance, which exceeds the base RoHS requirement. With 5833 pieces in inventory, this substitute provides superior supply availability. No circuit redesign is required for this substitution.

FW2500039Q (Diodes Incorporated) - Secondary Substitute with Compliance Advantage

This part matches the TXC 8Z25020002 in frequency, stability, load capacitance, and operating temperature range. The ESR is 80 Ohms versus 100 Ohms in the original part, representing a 20% reduction in series resistance. This lower ESR may improve circuit performance in applications sensitive to crystal impedance. The part carries AEC-Q200 automotive qualification and ROHS3 compliance, indicating higher reliability standards. Physical dimensions are 2.00 x 1.60 mm with 0.55 mm height, maintaining compatibility with standard 4-SMD footprints. Inventory availability is 5891 pieces. Circuit validation is recommended to confirm ESR tolerance acceptance.

8Q-25.000MAHI-T (FTS) - Tertiary Substitute with Size Advantage

This part matches frequency, stability, ESR, and operating temperature specifications. The load capacitance is 16pF versus 18pF in the original part, representing a 2pF reduction. Physical dimensions are significantly smaller at 1.60 x 1.20 mm with 0.40 mm height, enabling space-constrained applications. This dimensional reduction may require PCB layout verification to confirm footprint compatibility. Inventory availability is 3567 pieces. Circuit simulation or testing is required to validate load capacitance compatibility with the target application.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the TXC 8Z25020002 with the QT252S-25.000MAHJ-T without circuit modification?

A: Yes. The QT252S-25.000MAHJ-T is a direct parametric equivalent with identical frequency (25 MHz), frequency stability (±30ppm), load capacitance (18pF), ESR (100 Ohms), and physical dimensions (2.50 x 2.00 mm). No circuit redesign is required. Both parts are RoHS compliant with MSL 1 rating.

Q2: What is the difference between the 18pF load capacitance in the TXC part and the 16pF in the FTS 8Q-25.000MAHI-T?

A: Load capacitance determines the external capacitive loading required for the crystal to oscillate at the specified frequency. The 2pF difference between 18pF and 16pF represents a variation within typical circuit design tolerance. However, the specific impact depends on the oscillator circuit design. Circuit simulation or empirical testing is required to confirm frequency accuracy and stability with the 16pF variant.

Q3: Why does the Diodes FW2500039Q have 80 Ohms ESR instead of 100 Ohms?

A: ESR (Equivalent Series Resistance) is an intrinsic characteristic of the crystal element and manufacturing process. The 80 Ohms ESR in the FW2500039Q represents a lower impedance design, which may reduce power consumption and improve drive level performance in certain oscillator circuits. This is not a deficiency but a design variation. Verify that the oscillator circuit can accommodate the lower ESR specification.

Q4: Are all three substitute parts pin-compatible with the TXC 8Z25020002?

A: All three substitute parts use the 4-SMD, No Lead package configuration with identical pin count and electrical function. However, physical dimensions vary: the TXC and QST parts are 2.50 x 2.00 mm, the Diodes part is 2.00 x 1.60 mm, and the FTS part is 1.60 x 1.20 mm. Verify PCB footprint compatibility before substitution. Smaller packages may require layout adjustment.

Q5: Do all substitute parts meet RoHS compliance requirements?

A: Yes. The TXC 8Z25020002 is RoHS Compliant. The QST QT252S-25.000MAHJ-T and Diodes FW2500039Q are ROHS3 Compliant, which represents an enhanced compliance level. The FTS 8Q-25.000MAHI-T is RoHS Compliant. All parts meet or exceed the base RoHS requirement.

Q6: Which substitute part offers the best supply availability?

A: The Diodes FW2500039Q has the highest inventory at 5891 pieces, followed by the QST QT252S-25.000MAHJ-T at 5833 pieces. The FTS 8Q-25.000MAHI-T has 3567 pieces available. All three substitutes provide significantly higher inventory than the original TXC part (1024 pieces).

Q7: Can I use the smaller FTS 8Q-25.000MAHI-T in a space-constrained design?

A: The FTS part offers a significant size reduction (1.60 x 1.20 mm vs. 2.50 x 2.00 mm) and lower height (0.40 mm vs. 0.55 mm). However, the 2pF load capacitance difference (16pF vs. 18pF) requires circuit validation. PCB layout must be verified to confirm the smaller footprint is compatible with your design. Consult the oscillator circuit design specifications before substitution.

Q8: What is the Moisture Sensitivity Level (MSL) rating, and why is it important?

A: MSL 1 (Unlimited) indicates that the crystal component has unlimited shelf life and requires no special moisture control during storage or handling. All four parts (original and three substitutes) carry MSL 1 rating, meaning they can be stored and handled under standard conditions without desiccant packaging or baking procedures.