CS20-4.679545MABJ-UT Equivalent & Substitute Parts

Part Overview

The CS20-4.679545MABJ-UT is a 4.679545 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for applications requiring precise frequency reference at this standard NTSC color subcarrier frequency. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing production support, design updates, and inventory management. The crystal operates in fundamental mode with 18pF load capacitance and 200 Ohms equivalent series resistance in a 4-SMD, no-lead surface mount package.

Substiute Parts

CS20-3.579545MABJ-UT

Citizen Finedevice Co LtdIn Stock: 752CS20-3.579545MABJ-UT Datasheet

Current PartRFQ

ABC2-3.579545MHZ-4-T

Abracon LLCIn Stock: 1117ABC2-3.579545MHZ-4-T Datasheet

SimilarRFQ

ECS-35-17-18-TR

ECS Inc.In Stock: 1276ECS-35-17-18-TR Datasheet

SimilarRFQ

ECS-35-17-19A-TR

ECS Inc.In Stock: 1233ECS-35-17-19A-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS20-4.679545MABJ-UT is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Frequency: 4.679545 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 18pF or 17pF (minor variation acceptable within circuit design margins)
• ESR: 200 Ohms or lower (lower ESR acceptable; higher ESR not acceptable)
• Operating Mode: Fundamental (exact match required)
• Package Type: 4-SMD or 2-SMD, no-lead (surface mount compatibility required)
• Operating Temperature: Must encompass or match the original range

Identified Substitutes:

1. ABC2-4.679545MHZ-4-T (Abracon LLC) – Direct 4-SMD substitute with improved ESR (140 Ohms vs. 200 Ohms) and active product status
2. ECS-35-17-18-TR (ECS Inc.) – 4-SMD substitute with 17pF load capacitance and extended temperature range
3. ECS-35-17-19A-TR (ECS Inc.) – 2-SMD substitute with 17pF load capacitance and compact footprint

Parameter Comparison

Engineering Selection Recommendations

ABC2-4.679545MHZ-4-T is the primary substitute for direct replacement applications. This part maintains identical frequency, tolerance, and load capacitance specifications while offering superior ESR performance (140 Ohms vs. 200 Ohms). The part is active in production with ROHS3 compliance and Abracon LLC manufacturing support. Footprint compatibility is confirmed with 4-SMD, no-lead packaging. The identical operating temperature range (-10°C ~ 60°C) ensures thermal performance parity.

ECS-35-17-18-TR provides an alternative with extended operating temperature range (-40°C ~ 85°C), suitable for applications requiring broader thermal operation. The 17pF load capacitance represents a minor deviation from the original 18pF specification; circuit design verification is necessary to confirm compatibility with existing oscillator tank circuits. This part maintains 200 Ohms ESR and 4-SMD packaging. ROHS3 compliance and active product status support long-term availability.

ECS-35-17-19A-TR is suitable for space-constrained applications requiring a compact footprint. The 2-SMD package reduces board area compared to the 4-SMD configuration. The 17pF load capacitance and 200 Ohms ESR match the ECS-35-17-18-TR specification. Operating temperature range (-10°C ~ 70°C) exceeds the original part by 10°C on the upper limit. ROHS3 compliance and active status confirm production viability.

Frequently Asked Questions (FAQ)

Q: Can ABC2-4.679545MHZ-4-T be used as a direct drop-in replacement for CS20-4.679545MABJ-UT?

A: Yes. Both parts share identical frequency (4.679545 MHz), frequency tolerance (±30ppm), load capacitance (18pF), operating mode (fundamental), and operating temperature range (-10°C ~ 60°C). The 4-SMD, no-lead package footprints are compatible. The lower ESR of the Abracon part (140 Ohms vs. 200 Ohms) is electrically favorable and does not require circuit modification.

Q: What is the significance of the 17pF vs. 18pF load capacitance difference?

A: Load capacitance determines the oscillator tank circuit design. The ECS parts specify 17pF instead of 18pF. This 1pF difference may require adjustment to external load capacitors in the crystal oscillator circuit to maintain frequency accuracy. Circuit simulation or empirical testing is necessary to confirm frequency stability within the ±30ppm tolerance band when substituting with 17pF load capacitance parts.

Q: Why does ECS-35-17-18-TR have a wider operating temperature range?

A: ECS-35-17-18-TR is specified for -40°C ~ 85°C operation, compared to the original -10°C ~ 60°C range. This extended specification reflects the design and qualification of the ECS crystal for broader industrial and automotive applications. If the application operates only within -10°C ~ 60°C, this extended range provides additional thermal margin without penalty.

Q: Is the 2-SMD package of ECS-35-17-19A-TR compatible with a 4-SMD footprint?

A: No. The 2-SMD and 4-SMD packages have different pad configurations and cannot be used interchangeably without PCB redesign. The 2-SMD option is suitable only for new designs or boards with compatible footprints. The reduced footprint (11.00mm x 5.00mm vs. 11.60mm x 5.50mm) and lower height (2.00mm vs. 2.20mm) may provide benefits in space-constrained applications.

Q: Are all substitute parts ROHS3 compliant?

A: ABC2-4.679545MHZ-4-T, ECS-35-17-18-TR, and ECS-35-17-19A-TR are all ROHS3 compliant. The original CS20-4.679545MABJ-UT does not specify RoHS status. For applications requiring RoHS compliance, all three substitutes meet this requirement.

Q: What is the inventory status of these substitute parts?

A: ABC2-4.679545MHZ-4-T: 1083 Pcs in stock. ECS-35-17-18-TR: 1197 Pcs in stock. ECS-35-17-19A-TR: 1149 Pcs in stock. All substitutes are available in active production quantities.