AS-4.000-16-EXT-SMD-TR Equivalent & Substitute Parts

Part Overview

The AS-4.000-16-EXT-SMD-TR is a 4 MHz surface mount crystal oscillator manufactured by Raltron Electronics. This component operates at a fundamental frequency with ±30ppm tolerance and 16pF load capacitance, housed in an HC-49/US package. The part is Active in product status and RoHS3 compliant. Substitute parts are identified for applications requiring alternative mounting types, load capacitance values, or ESR specifications while maintaining core frequency and stability parameters.

Substiute Parts

AS-4.000-16-EXT-SMD-TR

Raltron ElectronicsIn Stock: 1080AS-4.000-16-EXT-SMD-TR Datasheet

Current PartRFQ

ATS040-E

CTS-Frequency ControlsIn Stock: 3802ATS040-E Datasheet

SimilarRFQ

ATS040B-E

CTS-Frequency ControlsIn Stock: 3057ATS040B-E Datasheet

SimilarRFQ

ECS-40-18-4XEN

ECS Inc.In Stock: 11962ECS-40-18-4XEN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AS-4.000-16-EXT-SMD-TR is determined by the following critical parameters: frequency (4 MHz), frequency tolerance (±30ppm), frequency stability (±50ppm), operating mode (Fundamental), operating temperature range (-40°C to 85°C), package type (HC-49/US), RoHS3 compliance, and MSL rating (1).

Substitute parts maintain identical frequency, tolerance, stability, operating mode, temperature range, package designation, and compliance certifications. Variations in load capacitance (16pF, 18pF, or 20pF) and ESR (120 to 150 Ohms) are permissible within the HC-49/US package family. Mounting type differs between the main part (Surface Mount) and substitute parts (Through Hole), reflecting alternative assembly requirements.

The three identified substitutes are:

ATS040-E (CTS-Frequency Controls): 4 MHz, ±30ppm, 20pF load capacitance, 120 Ohms ESR, Through Hole, HC-49/US package

ATS040B-E (CTS-Frequency Controls): 4 MHz, ±30ppm, 18pF load capacitance, 120 Ohms ESR, Through Hole, HC-49/US package

ECS-40-18-4XEN (ECS Inc.): 4 MHz, ±30ppm, 18pF load capacitance, 150 Ohms ESR, Through Hole, HC-49/US package

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and full RoHS3 compliance with REACH Unaffected designation, ensuring regulatory alignment with the original AS-4.000-16-EXT-SMD-TR component.

For Surface Mount Applications: The AS-4.000-16-EXT-SMD-TR remains the appropriate selection due to its surface mount configuration. No substitute parts are available in surface mount packaging.

For Through Hole Applications: All three substitute parts (ATS040-E, ATS040B-E, ECS-40-18-4XEN) are suitable for through hole assembly requirements. Selection between these substitutes depends on load capacitance and ESR specifications required by the circuit design.

Load Capacitance Considerations: The main part specifies 16pF load capacitance. Substitute parts offer 18pF (ATS040B-E, ECS-40-18-4XEN) or 20pF (ATS040-E) load capacitance. Circuit design must accommodate these variations.

ESR Specifications: The main part specifies 130 Ohms ESR. Substitute parts provide 120 Ohms (ATS040-E, ATS040B-E) or 150 Ohms (ECS-40-18-4XEN) ESR. Circuit impedance matching requirements determine acceptable ESR ranges.

Frequently Asked Questions (FAQ)

Q: Can ATS040-E, ATS040B-E, or ECS-40-18-4XEN be used as direct replacements for AS-4.000-16-EXT-SMD-TR in surface mount applications?

A: No. The AS-4.000-16-EXT-SMD-TR is configured for surface mount assembly, while all substitute parts are through hole components. Mounting type is not interchangeable without circuit board redesign.

Q: What is the primary difference between ATS040-E and ATS040B-E?

A: Both parts are manufactured by CTS-Frequency Controls and share identical frequency, tolerance, stability, ESR (120 Ohms), and operating specifications. The difference is load capacitance: ATS040-E specifies 20pF, while ATS040B-E specifies 18pF.

Q: How does the 130 Ohms ESR of the main part compare to substitute parts?

A: The AS-4.000-16-EXT-SMD-TR specifies 130 Ohms ESR. Substitute parts provide lower ESR (120 Ohms for ATS040-E and ATS040B-E) or higher ESR (150 Ohms for ECS-40-18-4XEN). Circuit design must confirm ESR compatibility.

Q: Are all parts RoHS3 compliant?

A: Yes. The AS-4.000-16-EXT-SMD-TR and all three substitute parts (ATS040-E, ATS040B-E, ECS-40-18-4XEN) are ROHS3 Compliant with REACH Unaffected status.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations and does not require special moisture control during storage or handling. All parts in this comparison carry this rating.

Q: Can load capacitance differences affect circuit operation?

A: Yes. Load capacitance affects crystal oscillator frequency accuracy and circuit resonance. The main part specifies 16pF, while substitutes offer 18pF or 20pF. Circuit design must confirm load capacitance compatibility before substitution.

Q: Are all parts available in the same package dimensions?

A: All parts use HC-49/US package designation. Physical dimensions vary slightly: AS-4.000-16-EXT-SMD-TR measures 12.00mm L x 4.80mm W x 4.00mm H (max), while substitute parts range from 10.85mm to 11.35mm length and 3.50mm to 3.68mm height. Mechanical fit must be verified for specific applications.

Q: What is the operating temperature range for all parts?

A: All parts operate across -40°C to 85°C, providing identical thermal performance specifications.