POC-4.000 Ceramic Resonator Equivalent & Substitute Parts

Part Overview

The POC-4.000 is a 4 MHz ceramic resonator manufactured by Raltron Electronics, featuring a built-in 30 pF capacitor and through-hole radial mounting. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. The part operates across the -20°C to 80°C temperature range with ±0.3% frequency stability and 30 Ohms impedance.

Key Parameters

Parameter	Value
Frequency	4 MHz
Frequency Stability	±0.3%
Frequency Tolerance	±0.5%
Built-in Capacitance	30 pF
Impedance	30 Ohms
Operating Temperature Range	-20°C to 80°C
Mounting Type	Through Hole
Package Configuration	Radial - 3 Lead, 2.50mm Pitch
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the POC-4.000 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Frequency: 4 MHz (exact match required)
Impedance: 30 Ohms (exact match required)
Mounting Type: Through Hole (exact match required)
Package Configuration: Radial - 3 Lead, 2.50mm Pitch (exact match required)
Operating Temperature Range: -20°C to 80°C (minimum coverage required)
Frequency Tolerance: ±0.5% (exact match required)

Allowable Variation Parameters:

Frequency Stability: The substitute may exceed the original specification (tighter tolerance acceptable)
Built-in Capacitance: Variation permitted within circuit design constraints
Physical Dimensions: Minor variations acceptable provided mounting compatibility is maintained
Product Status: Active status preferred for long-term availability

The CSTLS4M00G56-A0 qualifies as a substitute based on matching all mandatory parameters while providing improved frequency stability (±0.2% versus ±0.3%).

Parameter Comparison

Parameter	POC-4.000 (Raltron)	CSTLS4M00G56-A0 (Murata)	Match Status
Frequency	4 MHz	4 MHz	Exact Match
Frequency Stability	±0.3%	±0.2%	Substitute Exceeds Specification
Frequency Tolerance	±0.5%	±0.5%	Exact Match
Built-in Capacitance	30 pF	47 pF	Variation
Impedance	30 Ohms	30 Ohms	Exact Match
Operating Temperature Range	-20°C to 80°C	-20°C to 80°C	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package Configuration	Radial - 3 Lead, 2.50mm Pitch	Radial - 3 Lead, 2.50mm Pitch	Exact Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match
Product Status	Obsolete	Active	Substitute Status Preferred

Engineering Selection Recommendations

The CSTLS4M00G56-A0 from Murata Electronics is the qualified substitute for the obsolete POC-4.000. Selection is based on the following engineering criteria:

Compliance and Certification Alignment: Both parts maintain ROHS3 compliance, ensuring regulatory consistency in applications subject to hazardous substance restrictions. The substitute part carries active product status, providing assured long-term availability and manufacturing support.

Electrical Parameter Compatibility: The substitute maintains identical frequency (4 MHz), impedance (30 Ohms), frequency tolerance (±0.5%), and operating temperature range (-20°C to 80°C). The improved frequency stability specification (±0.2% versus ±0.3%) represents a performance enhancement without introducing compatibility concerns.

Mechanical and Mounting Compatibility: Both parts utilize identical through-hole radial mounting configurations with 2.50mm lead pitch, enabling direct board-level substitution without layout modifications.

Capacitance Consideration: The built-in capacitance differs between parts (30 pF versus 47 pF). Circuit designers must evaluate this parameter within the context of the specific application's frequency-setting network and load requirements.

Frequently Asked Questions (FAQ)

Q: Can the CSTLS4M00G56-A0 be used as a direct replacement for the POC-4.000 without circuit modifications?

A: The CSTLS4M00G56-A0 maintains electrical and mechanical compatibility for through-hole mounting. However, the built-in capacitance difference (47 pF versus 30 pF) may require circuit evaluation depending on the application's frequency-setting network design.

Q: What is the significance of the frequency stability improvement in the substitute part?

A: The CSTLS4M00G56-A0 provides ±0.2% frequency stability compared to the POC-4.000's ±0.3%. This represents a tighter tolerance specification, which enhances frequency accuracy without introducing compatibility issues.

Q: Are there any compliance differences between the two parts?

A: Both parts are ROHS3 compliant. The substitute part carries REACH Affected status, whereas the original part is REACH Unaffected. Applications subject to REACH regulations should account for this distinction.

Q: Does the physical size difference affect board-level integration?

A: Both parts use identical radial 3-lead configurations with 2.50mm pitch. The POC-4.000 measures 10.00mm L × 5.00mm W × 8.00mm H, while the CSTLS4M00G56-A0 measures 8.00mm L × 3.00mm W × 6.00mm H. The substitute part is physically smaller, which may provide layout advantages without requiring design changes.

Q: What is the primary reason for substitution?

A: The POC-4.000 is classified as obsolete. The CSTLS4M00G56-A0 is an active product with assured manufacturing continuity and supply availability.

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