9C48000077 Crystal Equivalent & Substitute Parts

Part Overview

The 9C48000077 is a 48 MHz surface mount crystal manufactured by TXC CORPORATION, designed for applications requiring precise frequency generation at 48 MHz with ±30ppm stability. This component features a 20pF load capacitance, 80 Ohms equivalent series resistance (ESR), and operates across the -40°C to 85°C temperature range in an HC-49/US package format.

The 9C48000077 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this crystal frequency and package specification.

Substiute Parts

9C48000077

TXC CORPORATIONIn Stock: 8419C48000077 Datasheet

Current PartRFQ

ABLS2-48.000MHZ-D4YF-T

Abracon LLCIn Stock: 772ABLS2-48.000MHZ-D4YF-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9C48000077 is determined by the following critical parameters:

Primary Matching Criteria:

• Frequency: 48.0000 MHz (exact match required)
• Frequency Stability: ±30ppm (tolerance specification)
• Package / Case: HC-49/US (mechanical and electrical interface)
• Mounting Type: Surface Mount (assembly compatibility)
• Operating Temperature Range: -40°C to 85°C (environmental specification)

Secondary Compatibility Parameters:

• Load Capacitance: 20pF nominal (circuit design parameter; minor variations within ±2pF acceptable based on circuit tuning)
• ESR: 80 Ohms (oscillator startup and performance; lower ESR values improve performance margins)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

The ABLS2-48.000MHZ-D4YF-T from Abracon LLC qualifies as a substitute part. While it specifies 18pF load capacitance and 40 Ohms ESR (both lower than the original), these parameters remain within acceptable substitution ranges for 48 MHz crystal applications. The lower ESR provides improved oscillator performance characteristics. Both parts maintain identical frequency, stability, package format, and temperature range specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The ABLS2-48.000MHZ-D4YF-T is suitable as a substitute for the 9C48000077 based on the following engineering factors:

1. Frequency and Stability Match: Both parts operate at 48.0000 MHz with ±30ppm stability, ensuring identical frequency generation performance in target applications.

2. Package Compatibility: Both components use the HC-49/US package with surface mount configuration, providing mechanical and electrical interface compatibility with existing PCB designs.

3. Temperature Range Alignment: Identical -40°C to 85°C operating range ensures thermal performance equivalence across specified environmental conditions.

4. Regulatory Compliance: Both parts maintain ROHS3 compliance, satisfying current environmental and regulatory requirements.

5. Product Status Advantage: The ABLS2-48.000MHZ-D4YF-T carries Active product status, ensuring ongoing availability and supply chain support, whereas the 9C48000077 is obsolete.

6. Performance Enhancement: The lower ESR (40 Ohms versus 80 Ohms) and reduced load capacitance (18pF versus 20pF) of the Abracon part provide improved oscillator startup characteristics and reduced power consumption.

Design Considerations:

The 2pF load capacitance difference and lower ESR require verification that the oscillator circuit tuning remains within acceptable frequency tolerance. Standard oscillator circuit design practices accommodate these parameter variations through load capacitance adjustment at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can the ABLS2-48.000MHZ-D4YF-T directly replace the 9C48000077 without circuit modifications?

A: Direct PCB-level replacement is possible due to identical package format and pinout. However, the 2pF load capacitance difference may require minor oscillator tuning adjustments to maintain specified frequency tolerance. Verification through circuit simulation or prototype testing is recommended for critical applications.

Q: What is the significance of the ESR difference between these parts?

A: The ABLS2-48.000MHZ-D4YF-T features 40 Ohms ESR compared to the 9C48000077's 80 Ohms. Lower ESR improves oscillator startup behavior, reduces power consumption, and provides better frequency stability margins. This represents a performance improvement for the substitute part.

Q: Are there mechanical compatibility concerns with the dimensional differences?

A: The ABLS2-48.000MHZ-D4YF-T is 0.10mm narrower and 0.80mm shorter than the 9C48000077. Both dimensions remain within standard HC-49/US package tolerances and are compatible with existing PCB footprints. The lower profile may provide additional clearance benefits in space-constrained designs.

Q: Why is the 9C48000077 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The ABLS2-48.000MHZ-D4YF-T from Abracon LLC maintains Active status, ensuring continued availability and manufacturing support for new designs and production requirements.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the 9C48000077 and ABLS2-48.000MHZ-D4YF-T are ROHS3 compliant and REACH affected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: What load capacitance value should be used in the oscillator circuit?

A: The oscillator circuit design should specify load capacitance based on the crystal manufacturer's recommendations and circuit requirements. The 2pF difference between parts (20pF versus 18pF) is accommodated through standard load capacitance tuning at the circuit level, typically implemented through adjustable or matched capacitor networks.