ECS-SR1-4.00-A-TR Equivalent & Substitute Parts

Part Overview

The ECS-SR1-4.00-A-TR is a 4 MHz ceramic resonator designed for surface mount applications. This component operates across a temperature range of -20°C to 80°C with a frequency stability of ±0.3% and impedance of 40 Ohms. The part is classified as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this resonator.

Key Parameters

Parameter	Value
Frequency	4 MHz
Frequency Stability	±0.3%
Frequency Tolerance	±0.5%
Impedance	40 Ohms
Operating Temperature Range	-20°C ~ 80°C
Mounting Type	Surface Mount
Package Type	2-SMD
Type	Ceramic

Substitute Part Grouping Explanation

Substitution of the ECS-SR1-4.00-A-TR is determined by the following critical parameters:

Frequency Match: 4 MHz (exact match required)
Frequency Stability: ±0.3% or better (substitute must meet or exceed this specification)
Mounting Type: Surface Mount (required for PCB compatibility)
Package Type: 2-SMD configuration (required for footprint compatibility)
Ceramic Type: Ceramic resonator (material class match)

The ECS-CTA-4.00-TR qualifies as a manufacturer-recommended substitute. It maintains the 4 MHz frequency specification, improves frequency stability to ±0.2%, and preserves surface mount compatibility with a 2-SMD package configuration. The impedance reduction from 40 Ohms to 30 Ohms and expanded operating temperature range (-25°C to 85°C) represent enhanced performance characteristics within acceptable substitution parameters.

Parameter Comparison

Parameter	ECS-SR1-4.00-A-TR (Main Part)	ECS-CTA-4.00-TR (Substitute)
Manufacturer	ECS Inc.	ECS Inc.
Type	Ceramic	Ceramic
Frequency	4 MHz	4 MHz
Frequency Stability	±0.3%	±0.2%
Frequency Tolerance	±0.5%	±0.5%
Impedance	40 Ohms	30 Ohms
Operating Temperature Range	-20°C ~ 80°C	-25°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	2-SMD, Non-Standard	2-SMD, No Lead
Size / Dimension	0.295" L x 0.130" W (7.50mm x 3.30mm)	0.236" L x 0.118" W (6.00mm x 3.00mm)
Height	0.071" (1.80mm)	0.067" (1.70mm)
Product Status	Last Time Buy	Active

Engineering Selection Recommendations

The ECS-CTA-4.00-TR is the manufacturer-recommended substitute for the ECS-SR1-4.00-A-TR. Selection of this substitute is supported by the following factors:

Product Status: The main part is Last Time Buy, while the substitute is Active, ensuring continued availability and supply chain stability.
Frequency Specification: Both parts maintain the 4 MHz center frequency with identical ±0.5% frequency tolerance.
Frequency Stability: The substitute provides improved stability at ±0.2% compared to the main part's ±0.3%, representing enhanced performance.
Surface Mount Compatibility: Both parts are surface mount devices with 2-SMD package configurations, maintaining PCB assembly compatibility.
Impedance Consideration: The impedance reduction from 40 Ohms to 30 Ohms requires circuit validation to confirm compatibility with existing load networks and oscillator designs.
Temperature Range: The substitute's expanded operating range (-25°C to 85°C) provides broader environmental coverage compared to the main part (-20°C to 80°C).
Physical Dimensions: The substitute features a smaller footprint (6.00mm x 3.00mm versus 7.50mm x 3.30mm), which may require PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can the ECS-CTA-4.00-TR be used as a direct replacement for the ECS-SR1-4.00-A-TR?

A: The ECS-CTA-4.00-TR is the manufacturer-recommended substitute and maintains the critical 4 MHz frequency specification and surface mount package type. However, the impedance change from 40 Ohms to 30 Ohms and the reduced physical dimensions require circuit validation to confirm compatibility with existing oscillator load networks and PCB layouts.

Q: What are the key differences between these two parts?

A: The primary differences are frequency stability (±0.2% versus ±0.3%), impedance (30 Ohms versus 40 Ohms), operating temperature range (-25°C to 85°C versus -20°C to 80°C), and physical dimensions (6.00mm x 3.00mm versus 7.50mm x 3.30mm). The substitute offers improved frequency stability and broader temperature coverage.

Q: Are there any package compatibility concerns?

A: Both parts use 2-SMD package configurations suitable for surface mount assembly. However, the substitute's smaller footprint (6.00mm x 3.00mm) differs from the main part (7.50mm x 3.30mm), requiring PCB layout verification to confirm pad spacing and component placement compatibility.

Q: How does the impedance difference affect circuit design?

A: The impedance reduction from 40 Ohms to 30 Ohms affects the load network design of the oscillator circuit. Circuit validation is necessary to confirm that existing load capacitance and resistance values remain compatible with the substitute part's impedance specification.

Q: What is the availability status of each part?

A: The ECS-SR1-4.00-A-TR is Last Time Buy with 23,688 pieces in stock. The ECS-CTA-4.00-TR is Active with 706 pieces in stock, ensuring long-term availability for new designs and production continuity.

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