A-4.000-S-TR Equivalent & Substitute Parts

Part Overview

The A-4.000-S-TR is a 4 MHz through-hole crystal oscillator manufactured by Raltron Electronics in the HC-49/U package. This component is classified as an active product and is designed for fundamental mode operation across industrial temperature ranges. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), making it suitable for standard PCB assembly environments. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory constraints require component alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

A-4.000-S-TR

Raltron ElectronicsIn Stock: 818A-4.000-S-TR Datasheet

Current PartRFQ

MP04A

CTS-Frequency ControlsIn Stock: 1758MP04A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A-4.000-S-TR is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 4 MHz
• Frequency Tolerance: ±30ppm
• Operating Mode: Fundamental
• Load Capacitance: Series
• Package / Case: HC-49/U
• Mounting Type: Through Hole
• Operating Temperature Range: -20°C ~ 70°C
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Variation permitted within component design specifications
• Physical dimensions: Minor variations acceptable within HC-49/U package envelope tolerances

The MP04A from CTS-Frequency Controls meets all mandatory matching parameters and is therefore classified as an equivalent substitute part.

Parameter Comparison

Engineering Selection Recommendations

Both the A-4.000-S-TR and MP04A are active products with identical regulatory compliance profiles. Selection between these parts is based on the following engineering considerations:

A-4.000-S-TR (Raltron Electronics):

• Lower ESR specification at 80 Ohms provides reduced insertion loss characteristics
• Slightly larger physical footprint within HC-49/U envelope
• Current inventory: 765 pieces

MP04A (CTS-Frequency Controls):

• Higher ESR specification at 100 Ohms
• Compact physical dimensions within HC-49/U envelope
• Higher inventory availability: 1,672 pieces
• Bulk packaging option

Both parts satisfy ROHS3 compliance, REACH unaffected status, and EAR99 export classification. The ESR difference of 20 Ohms between parts falls within acceptable tolerance for fundamental mode 4 MHz crystal applications operating at -20°C to 70°C. Physical dimension variations remain within HC-49/U package specifications and do not affect PCB layout compatibility for standard through-hole mounting.

Frequently Asked Questions (FAQ)

Q: Can the MP04A directly replace the A-4.000-S-TR in existing designs?

A: Yes. Both parts share identical frequency (4 MHz), frequency tolerance (±30ppm), operating mode (Fundamental), load capacitance (Series), package type (HC-49/U), mounting method (Through Hole), and operating temperature range (-20°C ~ 70°C). Physical dimensions remain within HC-49/U envelope specifications.

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

A: The A-4.000-S-TR specifies 80 Ohms ESR while the MP04A specifies 100 Ohms ESR. This 20 Ohm difference represents a variation in internal resistance characteristics. Both values are within acceptable ranges for fundamental mode 4 MHz crystal operation and do not affect frequency accuracy or stability specifications.

Q: Are there packaging differences between these parts?

A: The A-4.000-S-TR is supplied in Cut Tape (CT) packaging, while the MP04A is supplied in Bulk packaging. Both parts use identical HC-49/U through-hole package cases. Physical dimensions show minor variations (A-4.000-S-TR: 11.05mm x 4.65mm; MP04A: 10.85mm x 3.80mm) that remain within HC-49/U specifications and do not affect PCB mounting compatibility.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the A-4.000-S-TR and MP04A are ROHS3 compliant, REACH unaffected, carry MSL 1 (Unlimited) moisture sensitivity rating, and share the same ECCN (EAR99) and HTSUS code (8541.60.0030).

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

A: Both parts operate across the identical temperature range of -20°C to 70°C with frequency stability of ±50ppm and frequency tolerance of ±30ppm maintained throughout this range.